These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Geological context, mineralization, and timing of the Juramento sediment-hosted stratiform copper-silver deposit, Salta district, northwestern Argentina  

NASA Astrophysics Data System (ADS)

The Juramento deposit in northwestern Argentina exhibits several readily visible general characteristics of sediment-hosted stratiform copper (SSC) mineralization. It consists of fine-grained disseminated base-metal sulfides within marine to lacustrine graybeds (the basal whitish Late Cretaceous Lecho Sandstone and shallow-water carbonates of the overlying Maastrichtian Yacoraite Formation) that overlie a thick sequence of redbeds (the Pirgua Subgroup). The property has been examined and drilled in three successive exploration programs as a possible analog of world-class mineralization in the copperbelts of central Africa and the Kupferschiefer. The present report provides specific field and laboratory results that confirm the classification as SSC-type mineralization. The host graybeds are the basal sandstone and overlying oolitic and stromatolitic units of the Yacoraite Formation, which are shown from textural studies to be carbonaceous and to have initially contained very fine-grained, disseminated, syndiagenetic pyrite. These sediments would have been sufficiently porous and permeable in early diagenetic time to allow an infiltration of metalliferous fluids from the underlying redbeds, resulting in the observed progressive replacement of in situ pyrite by common base-metal sulfides (sphalerite, galena, argentiferous tetrahedrite, and copper-rich sulfides: first chalcopyrite, then bornite, and finally chalcocite). Sulfur isotope analyses indicate that a portion of the sulfur of ore-stage sulfides is isotopically heavier than that of pyrite, possibly due to a contribution from associated gypsum. Ore-stage sulfides are zoned vertically and obliquely through the mineralized zones, from cupriferous sulfides at low stratigraphic levels to lead- and zinc-rich mineralization above, with unreplaced pyrite remaining within upper Yacoraite strata. The zoned sulfides and their replacement textures, the peneconformable configuration of the mineralized zones, and the position of ore-stage mineralization adjacent to a stratigraphically defined redox transition from redbeds upward into graybeds indicate an overprint of copper (and accompanying ore-stage metals) on originally pyritic graybeds. The influx of ore-stage metals, presumably in an oxidized low-temperature brine, terminated with a silicification event that effectively sealed the host carbonates. These observations and the overall genetic interpretation are consistent with the general deposit-scale genetic model for early diagenetic SSC mineralization. The regional geologic context is also consistent with its classification as a SSC deposit: It is hosted by post-oxyatmoversion sediments and was formed in association with evaporites at a low paleolatitude in a major intracontinental rift system.

Durieux, C. Gustavo; Brown, Alex C.

2007-11-01

2

NORTHWESTERN UNIVERSITY Pattern Formation in Two-Frequency Forced Faraday Waves  

E-print Network

Pattern Formation in Two-Frequency Forced Faraday Waves Chad Michael Topaz This dissertation investigatesNORTHWESTERN UNIVERSITY Pattern Formation in Two-Frequency Forced Faraday Waves A DISSERTATION OF PHILOSOPHY Field of Applied Mathematics By Chad Michael Topaz EVANSTON, ILLINOIS December 2002 #12;ABSTRACT

Topaz, Chad M.

3

A team of researchers is modeling ozone formation induced by volatile organic NORTHWESTERN CHEMICAL AND BIOLOGICAL ENGINEERING  

E-print Network

mechanistic models based on kinetics and photochemistry, from which predictions of ozone production canA team of researchers is modeling ozone formation induced by volatile organic compounds. NORTHWESTERN CHEMICAL AND BIOLOGICAL ENGINEERING MECHANISTIC MODEL OF OZONE FORMATION Principal Investigator

Ottino, Julio M.

4

Airfall tuff in the Browns Park Formation, northwestern Colorado and northeastern Utah.  

USGS Publications Warehouse

Bedded airfall tuffs, mainly rhyolitic in composition and locally very thick, occur throughout the Browns Park Formation (upper Oligocene to upper Miocene) in northwestern Colorado and northeasternmost Utah. They have received only cursory attention other than for the purpose of radiometric dating. The present writer began study of the tuffs in 1980, hoping to use them as time-stratigraphic marker beds within the formation. Several tuff-rich stratigraphic sections were measured and numerous samples were collected. The results of petrographic and petrochemical studies of these samples are presented. -from Author

Luft, S.J.

1985-01-01

5

Formation of bottom water and its variability in the northwestern part of the Sea of Japan  

NASA Astrophysics Data System (ADS)

downslope descent of dense shelf water in the northwestern part of the Sea of Japan is investigated from a dynamical point of view, paying attention to the formation of bottom water in the winter of 2001. It is supposed that before 1980, the shelf water in Peter the Great Bay sometimes descended far down the continental slope, at least partly reaching depths in excess of 3000 m (the foot of the continental slope). After 1980, however, the shelf water did not descend as far; it either descended only moderately or not at all. In Winter 2001, however, the dense shelf water again descended to depths greater than 3000 m, resulting in the formation of bottom water. Descents of more than 3000 m are due to low temperatures coupled with high salinities, whereas the moderate descents of the late 20th century were purely related to the low temperature of the shelf water. It is estimated that over the continental slope, the shelf water becomes mixed with the ambient water in a ratio of about 1:9 for deep descents, whereas the ratio is about 1:5 for moderate descents. The formation of bottom water is greatly influenced by interannual atmospheric variability; thus in Winter 2001 a combination of the strengthened Siberian High (especially in its northern part) and the Aleutian Low advected very cold air into northeast Asia, producing dense shelf water and resulting in the formation of bottom water.

Tanaka, Kiyoshi

2014-03-01

6

Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado  

SciTech Connect

The Lower Permian Schoolhouse Member of the Maroon Formation (formerly considered the Schoolhouse Tongue of the Weber Sandstone) forms a partly exhumed petroleum reservoir in the Eagle basin of northwestern Colorado. The Schoolhouse consists mainly of yellowish gray to gray, low-angle to parallel bedded, very fine to fine-grained sandstone of eolian sand-sheet origin; interbedded fluvial deposits are present in most sections. The sand-sheet deposits of the Schoolhouse Member are sedimentologically and petrologically similar to those in the underlying red beds of the main body of the Maroon Formation, and the Schoolhouse is considered the uppermost sand sheet in the Maroon depositional sequence. The bleached and oil-stained Schoolhouse member is distinguished from the underlying Maroon red beds on the basis of its diagenetic history, which is related to regional hydrocarbon migration and development of secondary porosity. Geological and geochemical data suggest that Schoolhouse Member oils have upper Paleozoic sources, including the intrabasinal Belden Formation. 13 figs., 1 tab.

Johnson, S.Y.; Schenk, C.J.; Anders, D.L.; Tuttle, M.L. (Geological Survey, Denver, CO (USA))

1990-02-01

7

Detrital Zircon Provenance of Neoproterozoic and Cambrian Neruokpuk Formation of northwestern Canada: Implications for Phanerozoic Arctic Evolution  

NASA Astrophysics Data System (ADS)

Neoproterozoic and Cambrian strata of northwestern Canada are characterized as being derived predominantly from one or more of three principal sources. The sources comprise cratonic rocks of Paleoproterozoic and Archean ages; early Neoproterozoic Mackenzie Mountains Supergroup clastic strata; and Mesoproterozoic Wernecke Supergroup clastic strata, which are widely preserved in the northern Canadian Cordillera. The Neruokpuk Formation is a Late Neoproterozoic and Early Cambrian turbiditic succession located adjacent to the Yukon Stable Block in northwestern Yukon and adjacent northeastern Alaska. The dominant lithology is quartz to quartz-lithic sandstone, locally containing altered detrital feldspar and muscovite indicating contributions from a metamorphic source. The unit forms part of a Neoproterozoic to Early Devonian slope and basin succession that can be correlated in detail to coeval strata in the Selwyn Basin of the northern Canadian Cordillera. However, the Devonian structural and magmatic record for the unit associates it more closely with the Arctic Alaska terrane to the west and to northern Ellesmere Island, some 2000 km to the northeast, than to its present position in northwestern Laurentia. To test whether the Neruokpuk Formation is autochthonous relative to northwestern Laurentia, samples of sandstone from both the Proterozoic lower part and the Cambrian upper part of the unit were processed for detrital zircon analyses. These results were compared to previously published results from the Cambrian of northwestern Canada, as well as to newly analysed Late Neoproterozoic and Cambrian control samples that are known to be autochthonous. Neruokpuk Formation zircons are dominated by 1800-2000 Ma grains with subsidiary populations of 1000-1600 Ma, 2300-2500 Ma and 2600-2900 Ma, consistent with a mixed provenance strongly dominated by a Laurentian cratonic source, with minor contributions from Mackenzie Mountains Supergroup (which is dominated by 1000-1700 Ma populations) and Wernecke Supergroup. In addition, detrital muscovite yielded disturbed Ar-Ar spectra of 1800-1900 Ma, consistent with the most dominant zircon population. Detrital zircon distributions dominated by north Laurentian cratonic populations are widespread along the Arctic margin as far afield as northeastern Greenland. After integrating stratigraphic, biostratigraphic, structural, petrographic and geochronologic data, we infer that the Neruokpuk Formation was most likely deposited more or less in its present location relative to the Laurentian craton. Thus the northeasternmost part of Arctic Alaska probably is not far-travelled. The same conclusion cannot be assumed for other parts of Arctic Alaska which may comprise several individual terranes, some of which may be far-travelled, that assembled prior to Late Devonian time.

Lane, L.; Gehrels, G. E.; Layer, P. W.

2012-12-01

8

Sedimentology and depositional environments of Lower Permian Yeso Formation in northwestern New Mexico  

SciTech Connect

The northwesternmost exposures of the Lower Permian (Leonardian) Yeso Formation are in uplifts that bound the southern half of the San Juan basin in northwestern New Mexico. The Yeso comprises the Meseta Blanca member and overlying San Ysidro Member. The latter is called the Los Vallos Member in the southern part of the study area. The Meseta Blanca consists of cross-stratified and horizontal to wavy-bedded sandstones of eolian-dune, sand-sheet, and sabkha origin. These facies also occur in the San Ysidro (Los Vallos), which additionally includes mud-draped, ripple-laminated sandstones of supratidal mud-flat origin, gypsiferous sandstones and siltstones of sabkha origin, and evaporite-carbonate rocks of intertidal to marine-shelf origin. Paleocurrent analysis indicates that eolian dunes in the Meseta Blanca migrated southward in the northern part of the study area. These dunes may have been extensions of the DeChelly Sandstone erg to the northwest. Dunes in the southern part of the study area shifted under variable north-south winds. This variability may reflect a seasonal onshore/offshore wind regime. Lateral facies changes in the San Ysidro (Los Vallos) indicate a juxtaposition of eolian-dune and sand-dominated sabkha environments in the northern part of the study area, with coastal-sabkha, tidal, and shelf environments in the southern part. Eolian dunes prograded southward over coastal sabkhas at least 12 times during deposition of the Yeso. A northward shift of all facies during middle San Ysidro deposition suggests a marine transgression from the south.

Stanesco, J.D. (Geological Survey, Denver, CO (USA))

1989-09-01

9

Significance of the goniatite Bilinguites eliasi and associated biotas, Parkwood Formation and Bangor Limestone, northwestern Alabama ( USA).  

USGS Publications Warehouse

The Bangor Limestone contains conodonts, smaller calcareous foraminifers, and a sparse marine macrofauna dating it as late or latest Chesterian (Late Mississippian). The Parkwood Formation, a paralic sequence disconformably overlying the Bangor, has yielded a fauna containing the reticuloceratid ammonoid Bilinguites eliasi Manger and Saunders which permits correlation of the Parkwood Formation in north-western Alabama to the upper part of the Prairie Grove Member of the Hale Formation in the type Morrowan sequence. The macrofauna occurring with the ammonoid, supports this correlation. Bilinguites eliasi also alows correlation with the lower part of the Yeadonian Stage (lowest Namurian 'C') of Europe. Florules collected just below and above the goniatite occurrence in Frankling County correlate with those in the lower two-thirds of the New River Formation, southern West Virgina, and with the upper Namurian of western Europe. -from Authors

Henry, T.W.; Gordon, M., Jr.; Schweinfurth, S.P.; Gillespie, W.H.

1985-01-01

10

THE INSTITUTES AT NORTHWESTERN MEDICINE AT NORTHWESTERN  

E-print Network

consults, primary care, acupuncture, naturopathic medicine, nutrition counseling, health psychologyTHE INSTITUTES AT NORTHWESTERN MEDICINE INNOVATION ENGINES AT NORTHWESTERN MEDICINE NORTHWESTERN INTEGRATIVE MEDICINE #12;THE INSTITUTES AT NORTHWESTERN MEDICINE INNOVATION ENGINES AT NORTHWESTERN MEDICINE

Contractor, Anis

11

Variations in vitrinite reflectance values for the Upper Cretaceous Mesaverde Formation, southeastern Piceance basin, northwestern Colorado  

SciTech Connect

The authors discuss how most of the Upper Cretaceous Mesaverde Formation in the southeastern Piceance basin is thermally mature enough to have produced hydrocarbons by thermal generation, but only part of the Mesaverde is thermally mature enough to have expelled significant amounts of natural gas. The Early Permian( ) Fryingpan Member of the Maroon Formation consists of quartz-rich, very fine to fine-grained sandstone deposited in eolian dune and interdune environments. The Fryingpan Member (formerly called the sandstone of the Fryingpan River) is removed from the State Bridge Formation and assigned to the Maroon Formation.

Nuccio, V.F.; Johnson, R.C.; Johnson, S.Y.

1989-01-01

12

Kizilcaören ore-bearing complex with carbonatites (northwestern Anatolia, Turkey): Formation time and mineralogy of rocks  

NASA Astrophysics Data System (ADS)

The results of isotope-geochronological and mineralogical studies of the rocks making up the Kizilcaören fluorite-barite-REE deposit, northwestern Anatolia, Turkey are discussed in the paper. The ore is a constituent of the subvolcanic complex localized in a large fault zone. The complex combines (from earlier to later rocks): (1) phonolite and trachyte stocks, (2) carbonatite and carbonate-silicate dikelike bodies; and (3) fluorite-barite-bastnaesite ore in the form of thick homogeneous veins and cement in breccia. The K-Ar dating of silicate igneous rocks and carbonatites shows that they were formed in the Chattian Age of the Oligocene 25-24 Ma ago. Mineralogical observations show that the ore is the youngest constituent in the rock complex. Supergene alteration deeply transformed ore-bearing rocks, in particular, resulting in leaching of primary minerals, presumably Ca-Mn-Fe carbonates, and in cementation of the residual bastnaesitefluorite framework by Fe and Mn hydroxides. Most of the studied rocks contain pyrochlore, LREE fluorocarbonates, Nb-bearing rutile, Fe-Mg micas, and K-feldspar. The genetic features of the deposit have been considered. In general, the ore-bearing rock complex is compared in the set of rocks and their mineralogy and geochemistry with deposits of the Gallinas Mountains in the United States, the Arshan and Khalyuta deposits in the western Transbaikalia region, and Mushugai-Khuduk deposit in Mongolia. The Kizilcaören deposit represents a variant of postmagmatic mineralization closely related to carbonatite magmatism associated with alkaline and subalkaline intermediate rocks.

Nikiforov, A. V.; Öztürk, H.; Altuncu, S.; Lebedev, V. A.

2014-02-01

13

THE INSTITUTES AT NORTHWESTERN MEDICINE AT NORTHWESTERN  

E-print Network

care, acupuncture, naturopathic medicine, nutrition counseling, health psychology, bodywork, energyTHE INSTITUTES AT NORTHWESTERN MEDICINE INNOVATION ENGINES AT NORTHWESTERN MEDICINE OSHER CENTER FOR INTEGRATIVE MEDICINE AT NORTHWESTERN UNIVERSITY #12;THE INSTITUTES AT NORTHWESTERN MEDICINE INNOVATION ENGINES

Engman, David M.

14

New information on olenelline trilobites from the Early Cambrian Sekwi Formation, Northwestern Canada  

E-print Network

A new species of olenelline trilobite, Nevadella keelensis, is described from the Early Cambrian (Cambrian Series 2, Stage 3) in the Sekwi Formation, Mackenzie Mountains, Canada. The difficulty in discerning between Nevadia Walcott, 1910...

Abe, Francine Reiko; Lieberman, Bruce S.; Pope, Michael C.; Dilliard, Kelly A.

2010-08-16

15

Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the Early Late Triassic Ischigualasto Formation of Northwestern Argentina  

PubMed Central

Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is “Chanaresuchus ischigualastensis”, based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered ‘Chanaresuchus ischigualastensis’ as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, “Chanaresuchus ischigualastensis” can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for ‘Chanaresuchus ischigualastensis’, which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids. PMID:25426846

Trotteyn, M. Jimena; Ezcurra, Martín D.

2014-01-01

16

Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the early late triassic ischigualasto formation of Northwestern Argentina.  

PubMed

Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal archosauriforms characterized by an elongated and dorsoventrally low skull. The group is endemic from the Middle-Late Triassic of South America. The most recently erected proterochampsid species is "Chanaresuchus ischigualastensis", based on a single, fairly complete skeleton from the early Late Triassic Ischigualasto Formation of northwestern Argentina. We describe here in detail the non-braincase cranial and postcranial anatomy of this species and revisit its taxonomy and phylogenetic relationships. The phylogenetic analysis recovered 'Chanaresuchus ischigualastensis' as part of a trichotomy together with Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, "Chanaresuchus ischigualastensis" can be potentially more closely related to Gualosuchus reigi, or even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after discussing previously claimed synapomorphies of Chanaresuchus, we could not find unambiguous support for the monophyly of the genus. As a result, we propose here the erection of the new genus Pseudochampsa for 'Chanaresuchus ischigualastensis', which results in the new combination Pseudochampsa ischigualastensis. The information provided here about the anatomy and taxonomy of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses focused on the biogeography and macroevolutionary history of proterochampsids. PMID:25426846

Trotteyn, M Jimena; Ezcurra, Martín D

2014-01-01

17

A New Basal Sauropodomorph (Dinosauria: Saurischia) from Quebrada del Barro Formation (Marayes-El Carrizal Basin), Northwestern Argentina  

PubMed Central

Background Argentinean basal sauropodomorphs are known by several specimens from different basins; Ischigualasto, El Tranquilo, and Mogna. The Argentinean record is diverse and includes some of the most primitive known sauropodomorphs such as Panphagia and Chromogisaurus, as well as more derived forms, including several massospondylids. Until now, the Massospondylidae were the group of basal sauropodomorphs most widely spread around Pangea with a record in almost all continents, mostly from the southern hemisphere, including the only record from Antarctica. Methodology/Principal Finding We describe here a new basal sauropodomorph, Leyesaurus marayensis gen. et sp. nov., from the Quebrada del Barro Formation, an Upper Triassic-Lower Jurassic unit that crops out in northwestern Argentina. The new taxon is represented by a partial articulated skeleton that includes the skull, vertebral column, scapular and pelvic girdles, and hindlimb. Leyesaurus is diagnosed by a set of unique features, such as a sharply acute angle (50 degrees) formed by the ascending process of the maxilla and the alveolar margin, a straight ascending process of the maxilla with a longitudinal ridge on its lateral surface, noticeably bulging labial side of the maxillary teeth, greatly elongated cervical vertebrae, and proximal articular surface of metatarsal III that is shelf-like and medially deflected. Phylogenetic analysis recovers Leyesaurus as a basal sauropodomorph, sister taxon of Adeopapposaurus within the Massospondylidae. Moreover, the results suggest that massospondylids achieved a higher diversity than previously thought. Conclusions/Significance Our phylogenetic results differ with respect to previous analyses by rejecting the massospondylid affinities of some taxa from the northern hemisphere (e.g., Seitaad, Sarahsaurus). As a result, the new taxon Leyesaurus, coupled with other recent discoveries, suggests that the diversity of massospondylids in the southern hemisphere was higher than in other regions of Pangea. Finally, the close affinities of Leyesaurus with the Lower Jurassic Massospondylus suggest a younger age for the Quebrada del Barro Formation than previously postulated. PMID:22096511

Apaldetti, Cecilia; Martinez, Ricardo N.; Alcober, Oscar A.; Pol, Diego

2011-01-01

18

Sedimentology of the Pliocene Upper Onzole Formation, an inner-trench slope succession in northwestern Ecuador  

Microsoft Academic Search

The Pliocene Upper Onzole Formation exposed in the vicinity of Punta Gorda, near Esmeraldas, Ecuador, is composed mainly of fine-grained mud turbidites, having regular vertical sequences of sedimentary structures associated with a positive grading, and bioturbation restricted mostly to the tops of beds. The remainder of beds measured consist of volcanic ash, mud pelagite, and glauconitic silt–sand turbidites. Vertical sequential

K. R Aalto; W Miller

1999-01-01

19

Probable Ankylosaur Ossicles from the Middle Cenomanian Dunvegan Formation of Northwestern Alberta, Canada  

PubMed Central

A sample of six probable fragmentary ankylosaur ossicles, collected from Cenomanian deposits of the Dunvegan Formation along the Peace River, represent one of the first dinosaurian skeletal fossils reported from pre-Santonian deposits in Alberta. Specimens were identified as ankylosaur by means of a palaeohistological analysis. The primary tissue is composed of zonal interwoven structural fibre bundles with irregularly-shaped lacunae, unlike the elongate lacunae of the secondary lamellar bone. The locality represents the most northerly Cenomanian occurrence of ankylosaur skeletal remains. Further fieldwork in under-examined areas of the province carries potential for additional finds. PMID:24816807

Burns, Michael E.; Vavrek, Matthew J.

2014-01-01

20

INNOVATION ENGINES AT NORTHWESTERN  

E-print Network

INNOVATION ENGINES AT NORTHWESTERN MEDICINE DIVISION OF RHEUMATOLOGY THE INSTITUTES AT NORTHWESTERN, Division of Rheumatology, Northwestern University Feinberg of Medicine Building on advancements in the treatment of inflammatory arthritis, the Division of Rheumatology at Northwestern University Feinberg School

Engman, David M.

21

The Inskip Formation, the Harmony Formation, and the Havallah Sequence of Northwestern Nevada - An Interrelated Paleozoic Assemblage in the Home of the Sonoma Orogeny  

USGS Publications Warehouse

An area between the towns of Winnemucca and Battle Mountain in northwestern Nevada, termed the arkosic triangle, includes the type areas of the middle to upper Paleozoic Inskip Formation and Havallah sequence, the Upper Devonian to Mississippian Harmony Formation, the Sonoma orogeny, and the Golconda thrust. According to an extensive body of scientific literature, the Havallah sequence, a diverse assemblage of oceanic rocks, was obducted onto the continent during the latest Permian or earliest Triassic Sonoma orogeny by way of the Golconda thrust. This has been the most commonly accepted theory for half a century, often cited but rarely challenged. The tectonic roles of the Inskip and Harmony Formations have remained uncertain, and they have never been fully integrated into the accepted theory. New, and newly interpreted, data are incompatible with the accepted theory and force comprehensive stratigraphic and tectonic concepts that include the Inskip and Harmony Formations as follows: middle to upper Paleozoic strata, including the Inskip, Harmony, and Havallah, form an interrelated assemblage that was deposited in a single basin on an autochthonous sequence of Cambrian, Ordovician, and lowest Silurian strata of the outer miogeocline. Sediments composing the Upper Devonian to Permian sequence entered the basin from both sides, arkosic sands, gravel, limestone olistoliths, and other detrital components entered from the west, and quartz, quartzite, chert, and other clasts from the east. Tectonic activity was expressed as: (1) Devonian uplift and erosion of part of the outer miogeocline; (2) Late Devonian depression of the same area, forming a trough, probably fault-bounded, in which the Inskip, Harmony, and Havallah were deposited; (3) production of intraformational and extrabasinal conglomerates derived from the basinal rocks; and (4) folding or tilting of the east side of the depositional basin in the Pennsylvanian. These middle to upper Paleozoic deposits were compressed in the Jurassic, causing east-verging thrusts in the eastern part of the depositional basin (Golconda thrust) and west-verging thrusts and folds in the western part. Hypotheses involving a far-traveled allochthon that was obducted from an ocean or back-arc basin are incompatible with modern observations and concepts.

Ketner, Keith B.

2008-01-01

22

Reservoir differences and formation mechanisms in the Ke-Bai overthrust belt, northwestern margin of the Junggar Basin, China  

Microsoft Academic Search

There are some differences in reservoir quality of clastic rock between the hanging wall and the foot wall of the Ke-Bai overthrust\\u000a belt, northwestern margin of the Junggar Basin, western China, which affect the efficient petroleum exploration in this highly\\u000a mature exploration area. Based on a large number of thin-sections, cast thin-sections, and physical property analysis of cores,\\u000a we systematically

Xiaomin Zhu; Shifa Zhu; Benzhong Xian; Shuping Chen; Lichun Kuang; Xinke Xue; Jingjing Xue; Xincai You

2010-01-01

23

Lithofacies, age, depositional setting, and geochemistry of the Otuk Formation in the Red Dog District, northwestern Alaska  

USGS Publications Warehouse

Complete penetration of the Otuk Formation in a continuous drill core (diamond-drill hole, DDH 927) from the Red Dog District illuminates the facies, age, depositional environment, source rock potential, and isotope stratigraphy of this unit in northwestern Alaska. The section, in the Wolverine Creek plate of the Endicott Mountains Allochthon (EMA), is ~82 meters (m) thick and appears structurally uncomplicated. Bedding dips are generally low and thicknesses recorded are close to true thicknesses. Preliminary synthesis of sedimentologic, paleontologic, and isotopic data suggests that the Otuk succession in DDH 927 is a largely complete, albeit condensed, marine Triassic section in conformable contact with marine Permian and Jurassic strata. The Otuk Formation in DDH 927 gradationally overlies gray siliceous mudstone of the Siksikpuk Formation (Permian, based on regional correlations) and underlies black organic-rich mudstone of the Kingak(?) Shale (Jurassic?, based on regional correlations). The informal shale, chert, and limestone members of the Otuk are recognized in DDH 927, but the Jurassic Blankenship Member is absent. The lower (shale) member consists of 28 m of black to light gray, silty shale with as much as 6.9 weight percent total organic carbon (TOC). Thin limy layers near the base of this member contain bivalve fragments (Claraia sp.?) consistent with an Early Triassic (Griesbachian-early Smithian) age. Gray radiolarian chert dominates the middle member (25 m thick) and yields radiolarians of Middle Triassic (Anisian and Ladinian) and Late Triassic (Carnian-late middle Norian) ages. Black to light gray silty shale, like that in the lower member, forms interbeds that range from a few millimeters to 7 centimeters in thickness through much of the middle member. A distinctive, 2.4-m-thick interval of black shale and calcareous radiolarite ~17 m above the base of the member has as much as 9.8 weight percent TOC, and a 1.9-m-thick interval of limy to cherty mudstone immediately above this contains radiolarians, foraminifers, conodonts, and halobiid bivalve fragments. The upper (limestone) member (29 m thick) is lime mudstone with monotid bivalves and late Norian radiolarians, overlain by gray chert that contains Rhaetian (latest Triassic) radiolarians; Rhaetian strata have not previously been documented in the Otuk. Rare gray to black shale interbeds in the upper member have as much as 3.4 weight percent TOC. At least 35 m of black mudstone overlies the limestone member; these strata lack interbeds of oil shale and chert that are characteristic of the Blankenship, and instead they resemble the Kingak Shale. Vitrinite reflectance values (2.45 and 2.47 percent Ro) from two samples of black shale in the chert member indicate that these rocks reached a high level of thermal maturity within the dry gas window. Regional correlations indicate that lithofacies in the Otuk Formation vary with both structural and geographic position. For example, the shale member of the Otuk in the Wolverine Creek plate includes more limy layers and less barite (as blades, nodules, and lenses) than equivalent strata in the structurally higher Red Dog plate of the EMA, but it has fewer limy layers than the shale member in the EMA ~450 kilometers (km) to the east at Tiglukpuk Creek. The limestone member of the Otuk is thicker in the Wolverine Creek plate than in the Red Dog plate and differs from this member in EMA sections to the east in containing an upper cherty interval that lacks monotids; a similar interval is seen at the top of the Otuk Formation ~125 km to the west (Lisburne Peninsula). Our observations are consistent with the interpretations of previous researchers that Otuk facies become more distal in higher structural positions and that within a given structural level more distal facies occur to the west. Recent paleogeographic reconstructions indicate that the Otuk accumulated at a relatively high paleolatitude with a bivalve fauna typical of the Boreal realm. A suite of ?13Corg (carbon isotopic composition of carbon) data (n=38)

Dumoulin, Julie A.; Burruss, Robert C.; Blome, Charles D.

2013-01-01

24

Hydrogeology and quality of ground water in the Boone Formation and Cotter Dolomite in karst terrain of northwestern Boone County, Arkansas  

SciTech Connect

Shallow groundwater flow systems in karst terrain of northwestern Boone County, Arkansas, are particularly susceptible to contamination. The potential for groundwater contamination probably is greater in the northern one-half of the study area where there are more photolineaments and presumably subsurface fractures. Groundwater samples from 17 springs discharging from the Boone Formation and 17 wells completed in the Cotter Dolomite were analyzed to determine ambient groundwater quality and to document water quality variations. The chemical constituents in groundwater generally did not exceed US Environmental Protection Agency primary or secondary maximum contaminant levels. However, fecal coliform and fecal streptococcus bacteria were detected in most springs and in three wells. One spring, located near an abandoned wood-treatment plant (a designated Superfund site), had maximum iron, manganese, lead, and pentachlorophenol concentration that exceeded US Environmental Protection Agency's primary or secondary maximum contamination levels for drinking water. Water samples collected from selected springs emerging from the Boone Formation exhibited an overall decrease in specific conductance and total alkalinity, calcium, magnesium, sodium, and chloride concentrations and an overall increase in nitrate, fecal coliform, and fecal streptococcus bacteria concentrations 3 to 8 hours after a rainstorm.

Leidy, V.A.; Morris, E.E. (Geological Survey, Little Rock, AR (United States))

1991-01-01

25

The Kharapeh orogenic gold deposit: Geological, structural, and geochemical controls on epizonal ore formation in West Azerbaijan Province, Northwestern Iran  

USGS Publications Warehouse

The Kharapeh gold deposit is located along the northwestern margin of the Sanandaj–Sirjan Zone (SSZ) in the West Azerbaijan province, Iran. It is an epizonal orogenic gold deposit formed within the deformed zone between central Iran and the Arabian plate during the Cretaceous–Tertiary Zagros orogeny. The deposit area is underlain by Cretaceous schist and marble, as well as altered andesite and dacite dikes. Structural analysis indicates that the rocks underwent tight to isoclinal recumbent folding and were subsequently co-axially refolded to upright open folds during a second deformation. Late- to post-tectonic Cenozoic granites and granodiorites occur northeast of the deposit area. Mineralization mainly is recognized within NW-trending extensional structures as veins and breccia zones. Normal faults, intermediate dikes, and quartz veins, oriented subparallel to the axial surface of the Kharapeh antiform, indicate synchronous extension perpendicular to the fold axis during the second folding event. The gold-bearing quartz veins are >1 km in length and average about 6 m in width; breccia zones are 10–50 m in length and ?1 m in width. Hydrothermal alteration mainly consists of silicification, sulfidation, chloritization, sericitization, and carbonatization. Paragenetic relationships indicate three distinct stages—replacement and silicification, brecciation and fracture filling, and cataclastic brecciation—with the latter two being gold-rich. Fluid inclusion data suggest mineral deposition at temperatures of at least 220–255°C and depths of at least 1.4–1.8 km, from a H2O–CO2±CH4 fluid of relatively high salinity (12–14 wt.% NaCl equiv.), which may reflect metamorphism of passive margin carbonate sequences. Ore fluid ?18O values between about 7? and 9? suggest no significant meteoric water input, despite gold deposition in a relatively shallow epizonal environment. Similarities to other deposits in the SSZ suggest that the deposit formed as part of a diachronous gold event during the middle to late Tertiary throughout the SSZ and during the final stages of the Zagros orogeny. The proximity of Kharapeh to the main tectonic suture of the orogen, well-developed regional fold systems with superimposed complex fracture geometries, and recognition of nearby volcanogenic massive sulfide systems that suggest a region characterized by sulfur- and metal-rich crustal rocks, collectively indicate an area of the SSZ with high favorability for undiscovered gold resources.

Niroomand, Shojaeddin; Goldfarb, Richard J.; Moore, Farib; Mohajjel, Mohammad; Marsh, Erin E.

2011-01-01

26

The Kharapeh orogenic gold deposit: geological, structural, and geochemical controls on epizonal ore formation in West Azerbaijan Province, Northwestern Iran  

NASA Astrophysics Data System (ADS)

The Kharapeh gold deposit is located along the northwestern margin of the Sanandaj-Sirjan Zone (SSZ) in the West Azerbaijan province, Iran. It is an epizonal orogenic gold deposit formed within the deformed zone between central Iran and the Arabian plate during the Cretaceous-Tertiary Zagros orogeny. The deposit area is underlain by Cretaceous schist and marble, as well as altered andesite and dacite dikes. Structural analysis indicates that the rocks underwent tight to isoclinal recumbent folding and were subsequently co-axially refolded to upright open folds during a second deformation. Late- to post-tectonic Cenozoic granites and granodiorites occur northeast of the deposit area. Mineralization mainly is recognized within NW-trending extensional structures as veins and breccia zones. Normal faults, intermediate dikes, and quartz veins, oriented subparallel to the axial surface of the Kharapeh antiform, indicate synchronous extension perpendicular to the fold axis during the second folding event. The gold-bearing quartz veins are >1 km in length and average about 6 m in width; breccia zones are 10-50 m in length and ?1 m in width. Hydrothermal alteration mainly consists of silicification, sulfidation, chloritization, sericitization, and carbonatization. Paragenetic relationships indicate three distinct stages—replacement and silicification, brecciation and fracture filling, and cataclastic brecciation—with the latter two being gold-rich. Fluid inclusion data suggest mineral deposition at temperatures of at least 220-255°C and depths of at least 1.4-1.8 km, from a H2O-CO2±CH4 fluid of relatively high salinity (12-14 wt.% NaCl equiv.), which may reflect metamorphism of passive margin carbonate sequences. Ore fluid ?18O values between about 7‰ and 9‰ suggest no significant meteoric water input, despite gold deposition in a relatively shallow epizonal environment. Similarities to other deposits in the SSZ suggest that the deposit formed as part of a diachronous gold event during the middle to late Tertiary throughout the SSZ and during the final stages of the Zagros orogeny. The proximity of Kharapeh to the main tectonic suture of the orogen, well-developed regional fold systems with superimposed complex fracture geometries, and recognition of nearby volcanogenic massive sulfide systems that suggest a region characterized by sulfur- and metal-rich crustal rocks, collectively indicate an area of the SSZ with high favorability for undiscovered gold resources.

Niroomand, Shojaeddin; Goldfarb, Richard J.; Moore, Farid; Mohajjel, Mohammad; Marsh, Erin E.

2011-04-01

27

The Palaeoproterozoic Woodlands Formation of eastern Botswana-northwestern South Africa: lithostratigraphy and relationship with Transvaal Basin inversion structures  

NASA Astrophysics Data System (ADS)

The Woodlands Formation (uppermost Pretoria Group) of eastern Botswana overlies thick quartzites of the Sengoma Formation (Magaliesberg Formation) and comprises a lower unit of interbedded mudrocks and fine-grained recrystallised quartzitic sandstones, succeeded by chaotic and very coarse-grained inferred slump deposits. Within the adjacent western region of South Africa, interbedded mudrocks and quartzitic sandstones stratigraphically overlying the Magaliesberg Formation are now assigned to the lower Woodlands Formation. Within the entire region, interference folding produced by northeast-southwest (F 1 and F 3) and northwest-southeast (F 2) compression, and concomitant faulting characterised inversion of the Pretoria Group basin. This deformation is of pre-Bushveld age and affected all units in the Pretoria Group, including the uppermost Silverton, Magaliesberg and Woodlands Formations, and intrusive Marico Hypabyssal Suite (pre-Bushveld) mafic sills. The Nietverdiend lobe of the Bushveld Complex, intrusive into this succession, was not similarly deformed. Movement along the major Mannyelanong Fault in the northwest of the study area post-dated Transvaal Basin inversion, after which the "upper Woodlands" chaotic slump deposits were formed. The latter must thus belong to a younger stratigraphical unit and is possibly analogous to apparently syntectonic sedimentary rocks (Otse Group) in the Otse Basin of eastern Botswana.

Eriksson, P. G.; Van Der Merwe, R.; Bumby, A. J.

1998-11-01

28

Quaternary basin formation along the Dien Bien Phu fault zone and its neotectonic implication of northwestern Vietnam  

NASA Astrophysics Data System (ADS)

The Dien Bien Phu (DBP) fault zone is one of the most conspicuous fault systems in the Indochina, extending over a distance of 150 km from Yunnan, China through the NW Vietnam into Laos. Recent Global Positioning system (GPS) data in China yielded that the present clockwise rotation of the southeastern Tibet block geologically corresponds to a region of left-lateral strike-slip faults, such as the Xianshuihe-Xiaojang fault and Dien Bien Phu fault, which appear to have accommodated clockwise rotation; whereas other GPS data from the network of Southeast Asia proposed that Indochina constitutes a stable tectonic block moving approximately east with respect to Eurasia. Although above GPS data show insignificant differential motion along DBP fault, active sinistral slip can be identified by clear geomorphic features, focal solutions and seismicity distribution in a NNE-striking zone parallel to the fault zone. Mapping of surface fault traces along the DBP fault zone using field outcrops, geophysical data, and geomorphologic features recognized by the aerial photos, SRTM, ASTER imageries and derived digital elevation models shows that virtually all active faults are reactivated structures sub-parallel to chronostratigraphic boundary. Along the DBF fault, three larger basins have been developed by different kinematics from north to south. The northern one at Chan Nua is rhomboidal in shape with a dimension of 2.5 km?.5 km, which can be defined as a pull-apart basin resulted by the strike-slip motion of the DBP fault. The fault configuration associated with the central one changes to two parallel sinistral and sinistral-normal faults forming a narrow subsiding weak zone (10 km?.5 km) filled with Quaternary deposits. The southern one is, however, created by that the main DBP fault bends the strike from NNE to NE where branches out a sinistral- normal fault with N-striking controlling a half-graben basin (17 km? km) filled with Quaternary deposits about 200 m in depth above the late Neogene olivine basalt. The late Neogene basalt of age ca. 5 Ma seems being at least displaced 10 km by the branched sinistral-normal fault, giving a rate of ca. 2 mm/yr by left-lateral strike-slip since volcanic eruption. For the southern two basins, normal faulting has been confirmed occurring along their east margin, implying the NW-striking fault systems, i.e. Son La and Song Ma faults, in northwestern Vietnam are active. Although the proposed mechanisms of above-mentioned basins are still tentative, the DBP fault zone is undoubtedly undergoing extensional tectonic environment in rigid Indochina block. Further studies on basin depositional history and age determination are needed for the purpose of establishing the dynamic model of each basin and recognizing the neotectonic behavior of DBP fault.

Lai, K.; Chen, Y.; Chung, L.; Li, P.; Lam, D.

2006-12-01

29

3D slicing of radiogenic heat production in Bahariya Formation, Tut oil field, North-Western Desert, Egypt.  

PubMed

A 3D block of radiogenic heat production was constructed from the subsurface total gamma ray logs of Bahariya Formation, Western Desert, Egypt. The studied rocks possess a range of radiogenic heat production varying from 0.21 ?Wm(-3) to 2.2 ?Wm(-3). Sandstone rocks of Bahariya Formation have higher radiogenic heat production than the average for crustal sedimentary rocks. The high values of density log of Bahariya Formation indicate the presence of iron oxides which contribute the uranium radioactive ores that increase the radiogenic heat production of these rocks. The average radiogenic heat production produced from the study area is calculated as 6.3 kW. The histogram and cumulative frequency analyses illustrate that the range from 0.8 to 1.2 ?Wm(-3) is about 45.3% of radiogenic heat production values. The 3D slicing of the reservoir shows that the southeastern and northeastern parts of the study area have higher radiogenic heat production than other parts. PMID:23291561

Al-Alfy, I M; Nabih, M A

2013-03-01

30

Archean Age Fossils from Northwestern Australia (Approximately 3.3 to 3.5 GA, Warrawoona Group, Towers Formation)  

NASA Technical Reports Server (NTRS)

Archean aged rocks from the Pilbara Block area of western Australia (Warrawoona Group, Towers Formation, -3.3-3.5 Ga) contain microfossils that are composed of various sizes of spheres and filaments. The first descriptions of these microfossils were published in the late 1970's (Dunlop, 1978; Dunlop, et. al., 1978). The authenticity of the microfossils is well established. The small size of the microfossils prevents isotope dating, at least with the present technology. Microbiologists, however, have established guidelines to determine the authenticity of the Archean aged organic remains (Schopf, Walter, 1992).

Smith, Penny A. Morris

1999-01-01

31

The oleaginous Botryococcus from the Triassic Yanchang Formation in Ordos Basin, Northwestern China: Morphology and its paleoenvironmental significance  

NASA Astrophysics Data System (ADS)

High abundance but rather low diversity algal fossils were found in the hydrocarbon source rocks of the Ch 7-2-Ch 7-3 section, Triassic Yanchang Formation in the Xifeng area of southwest Ordos Basin, which are mainly composed of prolific Leiosphaeridia and Botryococcus. Botryococcus colonies are of various forms; the majority is nubbly, with some of cluster and cotton shape. The nubbly colonies appear globular, cordiform, ternate petal, obtuse triangle, chrysanthemum shape and so on. Most Botryococcus are saffron or brown and are frequently covered with clay under transmission microscope, and shows strong yellow and light brown under fluorescence microscope. Botryococcus could live in freshwater and brackish water. The Botryococcus colonies that lived in fresh water are small with small single cells arranged radially, with undulant or indented edges. The Botryococcus colonies that lived in brackish water are bigger, with larger single cells arranged irregularly, with slippery contours. The most of Botryococcus are discovered from the organic-rich argillaceous sediment with abundant pyrites in the semi- and deep-lake facies, and shows they were preserved in low-energy reducing environments. Taphonomic characteristics of various microfossils and the present of Pediastrum in the phytoplankton flora indicate that they are in situ or near burial. The lake area of the Ordos Basin was gradually expanding and reaching its most extensive flood surface in the Ch 7 of Yanchang Formation interval during the Middle and Late Triassic, with warm climate, plentiful rainfall, and luxuriant vegetation, as determined by the environmental analysis with Botryococcus in Xifeng area. The presence of two ecological types of Botryococcus indicates that the salinity of lake water was fluctuating in the Ch 7 interval. The occurrence of symbiotic acritarchs and geochemical salinity indices show that the Ordos Lake was a typical fresh-water lake, which was gradually desalted, and its salinity fluctuation was narrow during the Mid-Later Triassic. The ecological type of the palynological flora discovered from the Ch 7 to Ch 8 in Xifeng area is similar to that from the Fuxian Lake, with abundant Botryococcus in the Yungui Plateau of China. These findings imply that the Ordos Basin was in a lower-latitude area of temperate to subtropical climate during the Middle and Late Triassic.

Ji, Li-ming; Yan, Kui; Meng, Fan-wei; Zhao, Min

2010-05-01

32

Northwestern University Information Technology  

E-print Network

environment Classroom Laptop Mobile Device www.it.northwestern.edu NUITAcademic research productivity and enable breakthroughs not otherwise possible. Research Data Storage, called Vault desk for students, faculty, and staff for all technology- related issues including Laptop ER services

Shull, Kenneth R.

33

INSTITUTES AT NORTHWESTERN  

E-print Network

revolutionized how we deliver modern medicine to patients. Treatments for breast cancer, AIDS, leukemia for the treatment of cancer." Leonidas C. Platanias, MD, PhD, Interim Director of the Lurie Cancer Center and JesseTHE CANCER INSTITUTES AT NORTHWESTERN MEDICINE DEPARTMENT OF CANCER BIOLOGY THE INSTITUTES

Engman, David M.

34

Northwestern University Recombinant DNA  

E-print Network

Northwestern University Recombinant DNA Safety Program Office of Research Safety Office of the Vice deoxyribonucleic acid (DNA) shall comply with the National Institute of Health's "Guidelines for Research Involving Recombinant DNA Molecules" (NIH Guidelines) as published in the Federal Register (www

Shull, Kenneth R.

35

Northwestern University University Services  

E-print Network

, including travel policies, air travel, hotels, and car rentals. We also manage the online booking tool used and services to the University community. From shuttles and travel to lab supplies, purchasing, Wild.northwestern.edu/uservices Revised December 2013 Travel Services We provide information and resources for booking travel arrangements

Shahriar, Selim

36

Internanual variability of the biogeochemical fluxes in the deep water formation area in the northwestern Mediterranean Sea from a 3D coupled physical-biogeochemical model  

NASA Astrophysics Data System (ADS)

A biogeochemical model was coupled to a regional circulation model to investigate the interannual variability of the biogeochemical fluxes in the northwestern Mediterranean Sea. The physical model is the primitive equation ocean circulation S model [Marsaleix et al., 2011]. The biogeochemical model Eco3M-S [Auger et al., 2011] was used to describe the cycles of carbon, nitrogen, phosphorus and silica. The model results were compared with a set of in-situ and satellite observations available over the 5-year period study, 2004-2008. The comparisons provided a reasonable validation of the model reproducing the recorded spatial and temporal variations and suggested that it can be used to estimate a budget of biogenic elements. A strong variability of the intensity of the deep convection was observed over the study period. We investigated the impact of this variability on (1) the import of nutrients upwelled in the surface layer, (2) the primary production, (3) the export of organic carbon towards the bottom and on (4) the lateral exchanges.

Ulses, Caroline; Auger, Pierre-Amaël; Soetaert, Karline; Diaz, Fredéric; Marsaleix, Patrick; Kessouri, Fayçal; Herrmann, Marine; Estournel, Claude

2014-05-01

37

DENDROCHRONOLOGY IN NORTHWESTERN INDIANA  

Microsoft Academic Search

Wood samples from mature living Quercus alba (white oak) specimens in thirty-four woodlots across northwestern Indiana were analyzed by standard dendrochronological techniques. Trees growing on fine-textured soils reflected the greatest environmental stress, a result supporting an earlier hypothesis that the local distribution of xeric, oak-hickory plant communities was related to soil texture. Growth-ring patterns of trees from four woodlots near

FRANK L. CHARTON; JAY R. HARMAN

1973-01-01

38

Michigan State University Northwestern Michigan College  

E-print Network

Michigan State University and Northwestern Michigan College Reverse Transfer Transcript Release Michigan State University 426 Auditorium Road, Room 150 East Lansing, MI 48824-2603 Phone: (517) 355 Northwestern Michigan College _____________________ Please forward a transcript to: Northwestern Michigan

39

1 What induced the exceptional 2005 convection event 2 in the northwestern Mediterranean basin?  

E-print Network

1 What induced the exceptional 2005 convection event 2 in the northwestern Mediterranean basin? 3 2010. 6 [1] Opensea convection occurring in the northwestern Mediterranean basin (NWMED) is 7 at the origin of the formation of Western Mediterranean Deep Water (WMDW), one of 8 the main Mediterranean water

Paris-Sud XI, Université de

40

Geohydrology of the aquifers that may be affected by the surface mining of coal in the Fruitland Formation in the San Juan Basin, northwestern New Mexico  

USGS Publications Warehouse

A monitoring network of 50 wells was installed from 1975 to 1979 in the surface-mineable coal area. The purpose of the network was to collect hydrologic data and to establish a data base. The hydrologic data consist of water level measurements, water chemistry, and selected aquifer characteristics. The four aquifers considered in this study are: (1) The Pictured Cliffs Sandstone; (2) coal seams and interbedded lithologic units of the Fruitland Formation; (3) overburden of the Kirtland Shale and Fruitland Formation; and (4) the alluvium along the Chaco River and its eastern and northeastern tributaries. Five sites were selected for study. Four of these sites, Western Coal Company 's lease near Fruitland, Bisti West, Kimbeto, and Ojo Encino, have surface-mineable coal. The Chaco River alluvium was selected because it is downstream from anticipated mining activity. The specific conductances of the representative water samples from selected wells in the 4 aquifers in the 5 study areas ranged from 800 to 23,000 microsiemens/cm at 25 C. The dominant cation in all samples was sodium. The water is brackish in the Pictured Cliffs Sandstone and in the coal seams and interbedded lithologic units of the Fruitland Formation. It is fresh to saline in the overburden of the Fruitland Shale and Fruitland Formation, and fresh to brackish in the Chaco River alluvium. (Author 's abstract)

Myers, R.G.; Villanueva, E.D.

1986-01-01

41

Tertiary geodynamical evolution of northwestern Greece: paleomagnetic results  

Microsoft Academic Search

Paleomagnetic results have been obtained from 29 sites sampled in Lower to Upper Oligocene flysch sections of the Ionian Zone in northwestern Greece. They indicate a clockwise rotation of about 45° of the entire region. A comparison with previously published results relative to both younger and older formations shows that this rotation has occurred in two phases of comparable amplitude,

Catherine Kissel; Carlo Laj; Carla Müller

1985-01-01

42

Variations in vitrinite reflectance values for the Upper Cretaceous Mesaverde Formation, southeastern Piceance basin, northwestern Colorado; implications for burial history and potential hydrocarbon generation. The Frying Pan Member of the Maroon Formation; a lower Permian( ) basin-margin dune field in northwestern Colorado  

SciTech Connect

Most of the Upper Cretaceous Mesaverde Formation in the southeastern Piceance basin is thermally mature enough to have produced hydrocarbons by thermal generation, but only part of the Mesaverde is thermally mature enough to have expelled significant amounts of natural gas. The Early Permian( ) Frying pan Member of the Maroon Formation consists of quartz rich, very fine to fine-grained sandstone deposited in eolian dune and interdune environments. The Frying pan Member (formerly called the sandstone of the Frying pan River) is removed from the State Bridge Formation and assigned to the Maroon Formation.

Nuccio, V.F.; Johnson, R.C.; Johnson, S.Y.

1989-01-01

43

Modeling an air pollution episode in northwestern United States: Identifying the effect of nitrogen oxide and volatile organic compound emission changes on air pollutants formation using direct sensitivity analysis  

Microsoft Academic Search

Air quality impacts of VOCs and NOx emissions from major sources over the northwestern United States are simulated. The comprehensive nested modeling system is comprised of three models: CMAQ, WRF and SMOKE. In addition, the DDM-3D is used to determine the sensitivities of pollutant concentrations to changes in precursor emissions during a severe smog episode in July of 2006. The

Alexandra P. Tsimpidi; Marcus Trail; Yongtao Hu; Athanasios Nenes; Armistead G. Russell

2012-01-01

44

NORTHWESTERN UNIVERSITY 2006 FINANCIAL REPORT  

E-print Network

NORTHWESTERN UNIVERSITY 2006 FINANCIAL REPORT WINNING SCORES AND HIGH GRADES #12;Message from went to postseason competition, and we earned national championships in lacrosse, women's tennis Division I institutions and the highest-ranked school in the Big Ten. Scores are calculated by averaging

45

www.law.northwestern.edu www.law.northwestern.edu | 1  

E-print Network

www.law.northwestern.edu #12;#12;www.law.northwestern.edu | 1 At Northwestern Law the overarching the challenges of the changing world better than those of any other law school. We go beyond teaching the basics the delivery of justice, and respond to the changing contexts in which law and legal institutions operate. Our

Apkarian, A. Vania

46

Middle cretaceous carbonate reservoirs, Fahud Field and northwestern Oman: discussion  

SciTech Connect

A discussion is presented of the Cretaceous formations involved in Fahud field. Along the Trucial Coast, as in northwestern Oman, it is not difficult to date the time of formation of the foredeep. This article provides a stratigraphic correlation chart for the Cretaceous along the Arabian side of the Arabian Gulf. The terminology presented on this correlation chart reflects oil-industry usage in the area, including correlations published by Owen and Nasr, Loutfi and Jaber, Arabian American Oil Company, Beydoun and Dunnington, and Hassan et al.

Brennan, P.

1985-05-01

47

NORTHWESTERN UNIVERSITY Animal Care and Use Committee  

E-print Network

NORTHWESTERN UNIVERSITY Animal Care and Use Committee Reporting Concerns Regarding Animal Treatment All animals used at Northwestern University (NU) must be handled, housed, treated, cared for person having reason to question the treatment of animals at NU is encouraged to report incidents

Shahriar, Selim

48

Paleozoic-early Mesozoic gold deposits of the Xinjiang Autonomous Region, northwestern China  

Microsoft Academic Search

The late Paleozoic-early Mesozoic tectonic evolution of Xinjiang Autonomous Region, northwestern China provided a favorable geological setting for the formation of lode gold deposits along the sutures between a number of the major Eastern Asia cratonic blocks. These sutures are now represented by the Altay Shan, Tian Shan, and Kunlun Shan ranges, with the former two separated by the Junggar

Zongyao Rui; Richard J. Goldfarb; Yumin Qiu; Taihe Zhou; Renyi Chen; Franco Pirajno; Grace Yun

2002-01-01

49

The Idaho cobalt belt, northwestern United States — A metamorphosed Proterozoic exhalative ore district  

Microsoft Academic Search

In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine

J. L. Nold

1990-01-01

50

The Idaho cobalt belt, northwestern United States --- A metamorphosed Proterozoic exhalative ore district  

Microsoft Academic Search

In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine

J. L. Nold

1990-01-01

51

Middle Cretaceous carbonate reservoirs, Fahud field and northwestern Oman  

SciTech Connect

Reservoir facies in Fahud field and throughout northwestern Oman are in shallow-shelf carbonates of the middle Cretaceous Mishrif and Mauddud Formations. Interparticle porosity formed in the Mishrif as sand aprons of lithoclast and skeletal grainstones surrounding fault-block islands, and less commonly in the Mauddud as biostromes of rudist packstones. Moldic porosity after fine rudist debris is more common than interparticle porosity and occurs in thicker stratigraphic units, interpreted to have formed locally in meteoric-water lenses associated with islands, and regionally during subaerial exposure associated with sea level lows.

Harris, P.M.; Frost, S.H.

1984-05-01

52

Middle Cretaceous carbonate reservoirs, Fahud field and northwestern Oman  

SciTech Connect

Reservoir facies in Fahud field and throughout northwestern Oman are in shallow-shelf carbonates of the middle Cretaceous Mishrif and Mauddud Formations. Interparticle porosity formed in the Mishrif as sand aprons of lithoclast and skeletal grainstones surrounding fault-block islands and less commonly in the Mauddud as biostromes of rudist packstones. Moldic porosity after fine rudist debris is more common than interparticle porosity and occurs in thicker stratigraphic units, interpreted to have formed locally in meteoric-water lenses associated with islands, and regionally during subaerial exposure associated with sea level lows. 8 references, 9 figures.

Harris, P.M.; Frost, S.H.

1984-05-01

53

NORTHWESTERN UNIVERSITY Department of Art History  

E-print Network

AH_430 NORTHWESTERN UNIVERSITY Department of Art History STUDIES IN RENAISSANCE ART early modern history and art history, cultural and material history, the history of science and recent historiography of transcultural encounters between European states, the Ottoman Empire, the Mughal

54

THE INSTITUTES AT NORTHWESTERN MEDICINE FOR TRANSLATIONAL  

E-print Network

MEDICINE COGNITIVE NEUROLOGY AND ALZHEIMER'S DISEASE CENTER #12;THE INSTITUTES AT NORTHWESTERN MEDICINE COGNITIVE NEUROLOGY AND ALZHEIMER'S DISEASE CENTER (CNADC) "Our Cognitive Neurology and Alzheimer's Disease Professor in Neuroscience Established in 1994, the Cognitive Neurology and Alzheimer's Disease Center (CNADC

Engman, David M.

55

Northwestern University Feinberg School of Medicine  

E-print Network

guidelines for content style and search engine optimization. Content Structure What We Know About Web Users.northwestern.edu with tools and tips to build strong, user-friendly content. Using information from this guide, site owners

Engman, David M.

56

Origin of a Giant Event Deposit in Northwestern Cuba and Its Relation to K/T Boundary Impact  

NASA Astrophysics Data System (ADS)

We investigated the Penalver Formation in northwestern Cuba, which is a <180 m thick, normal-graded calcareous clastic deposit. This formation must have been formed by a grain flow and huge tsunami waves caused by the K/T boundary impact.

Takayama, H.; Tada, R.; Matsui, T.; Iturralde-Vinent, M. A.; Oji, T.; Tajika, E.; Kiyokawa, S.; Garciaanmd, D.; Okada, H.; Hasegawa, T.; Toyoda, K.

1999-03-01

57

Development of the Permian-Triassic unconformity in southwestern Utah, southeastern Nevada and northwestern Arizona  

Microsoft Academic Search

Development of positive areas, that are oriented northwest-southeast in south-western Utah, southeastern Nevada, and northwestern Arizona, are indicated by the depositional patterns of the Rock Canyon Conglomerate and facies changes produced by on-lapping during the deposition of the Timpoweap, Lower Red, and Virgin Limestone Members of the Moenkopi Formation. The lack of facies change in the Kaibab Formation indicates that

Nielson

1993-01-01

58

Summer Research Experience for Undergraduates at Northwestern The Materials Research Science and Engineering Center (MRSEC) at Northwestern  

E-print Network

Science and Engineering Center (MRSEC) at Northwestern University offers a 9-week, paid summer research in science and engineering fields. Research areas include ceramics, polymers, nanocomposites, photonicsSummer Research Experience for Undergraduates at Northwestern University The Materials Research

Levine, Alex J.

59

Geology of the lower Yellow Creek area, northwestern Colorado  

SciTech Connect

The geology and resources of the lower Yellow Creek area, an area at the northwestern margin of the Piceance Creek basin comprising of four 7.5-minute quadrangles, are described. Subsurface face rocks penetrated by drill holes range in age from Pennsylvania to Cretaceous. Measured sections show the Mancos Shale and the Castlegate Sandstone, Iles Formation, and Williams Fork Formation of the Mesaverde Group of Late Cretaceous age and the Fort Union, Wasatch, Green River, and Uinta formations of Tertiary age. Surficial deposits of Quaternary age include terrace gravels, alluvium, and landslides. Fold axes and faults in the area trend northwesterly. The southern part of the area contains major oil-shale resources. Coal-bearing zones in the Williams Fork and Iles formations contain considerable coal. The coal-resources potential is limited, however, by nonpersistence of the thicker coal beds. Small amounts of gas have been produced from shallow, lenticular Tertiary sandstones. Large, but very lowgrade uranium resources are present in the Fort Union Formation.

Hail, W.J. Jr.

1990-01-01

60

Interannual variability of sea fog frequency in the Northwestern Pacific in July  

NASA Astrophysics Data System (ADS)

The interannual variability in the sea fog frequency (SFF) in July in the midlatitude Northwestern Pacific (40°N-50°N, 140°E-170°W) from 1979 to 2009 is investigated with observations and reanalysis datasets. Composite analysis shows that in high-SSF years the center of the Northwestern Pacific subtropical high (SH) shifts eastward and a strengthened ridge exists in the midlatitude Northwestern Pacific. Under such conditions, large amount of moisture from the subtropics are transported northwardly by the southerlies over the west flank of the SH. The ridge is helpful for stable stratification and conductive to fog formation. In contrast, in low-SFF years the center of the SH expands westward and drifts further south; thus moisture can hardly reach the midlatitudes. Meanwhile an anomalous trough in the midlatitudes and the associated anomalous northerlies both weaken the southerlies and reduce the stability, unfavorable for fog occurrence. The case studies confirmed that the air parcels moving from the subtropical zone to the midlatitudes controlled by the SH, kept the higher temperature and humidity when flowing across the Kuroshio Extension, and then cooled down over the cold oceanic surface in fog case. The SFF in the Northwestern Pacific would decline under the conditions of global warming.

Zhang, Suping; Chen, Yang; Long, Jingchao; Han, Geng

2015-01-01

61

NorthwesternUniversity Feinberg School of Medicine  

E-print Network

research agenda. Applicants must be licensed or eligible for physical therapist licensure in Illinois- level physical therapists to become the future leaders of the profession, and scholars to conductNorthwesternUniversity Feinberg School of Medicine Director of Clinical Education/Assistant

Contractor, Anis

62

The Eskimo Songs of Northwestern Alaska  

Microsoft Academic Search

The findings are presented of ethnomusicologicd research in several Eskimo communities of northwestern Alaska where traditional music is still popular. In some of these communities, particularly at Point Hope, musical ceremonialism is considerable. There are three main classes of songs in use: game songs, songs-within- stories and dance songs. Song styles and dance styles differ from those of the Eskimo

THOMAS F. JOHNSTON

63

RATES FOR PROTEOMICS CORE Northwestern Users  

E-print Network

RATES FOR PROTEOMICS CORE Northwestern Users 1. $ 140 per sample; including proteolytic digestion and bioinformatic analyses. (The Core will charge users for supplies required for specific analytical workflows e removal from the sample. (This is additional charge to service 1 where "in solution digestion" is done) 3

Chisholm, Rex L.

64

Northwestern EECS 213 SETI Lab (Beta Test)  

E-print Network

for Extraterrestrial Intelligence (SETI) is a long-standing international effort to try to findNorthwestern EECS 213 SETI Lab (Beta Test) Spring 2013 The Search for a specific kind of intelligent signal within it, specifically an AM radio signal

Dinda, Peter A.

65

Northwestern University School of Speech: A History.  

ERIC Educational Resources Information Center

This book presents a concise history of the first 100 years of development of the school of speech at Northwestern University (Illinois). Following an introduction that provides an overview of the school, the first chapter focuses on both the efforts of Robert McLean Cumnock to found a school of oratory on the principles of elocution and the…

Rein, Lynn Miller

66

NORTHWESTERN UNIVERSITY Department of Art History  

E-print Network

AH_235 NORTHWESTERN UNIVERSITY Department of Art History INTRODUCTION TO LATIN AMERICAN ART of hybrid art forms that unite native and European sensibilities. Questions of religious and visual concerns both art and architecture from 1491-1960. The course initially focuses on Mexico and Peru

67

Northwestern University Office for Research Safety  

E-print Network

will help you make the best use of ISIS. It will explain how to assign a Safety Designate, add lab workers Safety Profile Menu Bar Features The Edit menu Basic Info Laboratories Lab Workers Safety Evaluation Lab Personnel Index of Figures 4 #12;Northwestern University Office for Research Safety HOW DO I GET

Shull, Kenneth R.

68

Production potential of chia in northwestern Argentina  

Microsoft Academic Search

The agricultural economy of northwestern Argentina depends on sugar and tobacco. Recently, depressed prices for these crops have caused severe economic problems in the region. Chia (Salvia hispanica L.), a source of oil and food, is considered an alterative crop to help diversify and stabilize the local economy. A research project to demonstrate the potential production of chia was initiated

Wayne Coates

1996-01-01

69

Middle proterozoic compressional orogen in northwestern Canada  

Microsoft Academic Search

Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of

Frederick A. Cook

1988-01-01

70

Ecotypic response to ultramafic soils by some plant species of northwestern United States  

Microsoft Academic Search

Soils high in magnesium derived from ultramafic rocks (serpentine, peridotite, and dunite) in northwestern United States support\\u000a endemic as well as wide-ranging but edaphically indifferent(bodenvag) species. The latter occur widely on diverse rock formations of the region. Severalbodenvag species are shown to respond ecotypically to ultramafic soils. Of 18 species tested, all but three are differentiated into\\u000a strains either tolerant

Arthur R. Kruckeberg

1967-01-01

71

Northwestern University | Physical Sciences in Oncology  

Cancer.gov

Northwestern University Physical Sciences-Oncology Center's (NU PS-OC) main focus is to probe the molecular basis of information flow within malignant cells. This center’s studies will highlight diverse characteristics of gene expression and storage. Moreover, these investigators postulate that in the cancerous state, the epigenome is significantly mutated. By merging experimental molecular and cellular biology with the physical sciences, these investigators will examine the regulation and expression of genes.

72

Commercial production of chia in Northwestern Argentina  

Microsoft Academic Search

The economy of northwestern Argentina depends heavily on sugar and tobacco. Depressed prices for these crops in recent years\\u000a have caused significant economic problems, and alternative crops are actively being sought. Chia (Salvia hispanica L.), a source of industrial oil for the cosmetics industry and ?-3 ?-linolenic acid for the food industry, is one new crop\\u000a that could help diversify

Wayne Coates

1998-01-01

73

40 CFR 81.126 - Northwestern Oklahoma Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Northwestern Oklahoma Intrastate Air Quality Control Region...Regions § 81.126 Northwestern Oklahoma Intrastate Air Quality Control Region. The Northwestern Oklahoma Intrastate Air Quality...

2013-07-01

74

40 CFR 81.126 - Northwestern Oklahoma Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Northwestern Oklahoma Intrastate Air Quality Control Region...Regions § 81.126 Northwestern Oklahoma Intrastate Air Quality Control Region. The Northwestern Oklahoma Intrastate Air Quality...

2012-07-01

75

40 CFR 81.126 - Northwestern Oklahoma Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2014 CFR

...2014-07-01 false Northwestern Oklahoma Intrastate Air Quality Control Region...Regions § 81.126 Northwestern Oklahoma Intrastate Air Quality Control Region. The Northwestern Oklahoma Intrastate Air Quality...

2014-07-01

76

40 CFR 81.126 - Northwestern Oklahoma Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Northwestern Oklahoma Intrastate Air Quality Control Region...Regions § 81.126 Northwestern Oklahoma Intrastate Air Quality Control Region. The Northwestern Oklahoma Intrastate Air Quality...

2011-07-01

77

40 CFR 81.126 - Northwestern Oklahoma Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Northwestern Oklahoma Intrastate Air Quality Control Region...Regions § 81.126 Northwestern Oklahoma Intrastate Air Quality Control Region. The Northwestern Oklahoma Intrastate Air Quality...

2010-07-01

78

consultant@northwestern.edu NU Mobile Desktop Videoconferencing  

E-print Network

...............................................................................9 WiFi and 3G Connectivity. Enter the portal address - main.vidyo.northwestern.edu 4. Enter your NetID and NetID password

Shahriar, Selim

79

Biostratigraphic interpretation for the cyclic sedimentation in northwestern Libya  

SciTech Connect

Mesozoic sediments in western Libya are best exposed along the Jabal Nafusah escarpment. This northeast-southwest trending structure overlooks the Al Jifarah plain and extends more than 300 km westward to connect with a T-shaped anticlinorium in Algeria and Tunisia. The Al Aziziyan fault (normal, north side down) parallels the northern edge of the escarpment and marks its initial position. Alternate deposition of marine and continental sediments began in the Triassic before the formation of a major monocline in the Late Jurassic-Early Cretaceous time. Subsequent epiorogenic movements and isostatic adjustments initiated a westward sloping shelf along the southern edge of the Tethys. As a result, the eastern and central regions of western Libya were subjected to severe erosion and coalescing of unconformities towards the topographic highs, prior to the deposition of the overstepping Kiklah Formation. Geometrical and physical interpretation of the Mesozoic sediments in the region, combined with paleogeographic reconstruction indicate that the post-Hercynian epiorogenic adjustments and fluctuations of the Tethys resulted in local cyclic sedimentation. Accurate age assessment of the boundaries between the Jurassic-Early Cretaceous facies in northwestern Libya can be carried out on the basis of microfloral and faunal distribution and makes possible correlation of aquifers and probable oil-bearing sequences in western Libya.

Tekbali, A.O.; Cornell, W.C. (Univ. of Texas at El Paso, (United States) Dept. of Geological Sciences)

1993-02-01

80

Brand Guidelines Northwestern University Feinberg School of Medicine  

E-print Network

Brand Guidelines Northwestern University Feinberg School of Medicine Published February 9, 2010 djfhakjd ExitForwardBack #12;1 Northwestern University Feinberg School of Medicine Brand Guidelines Story and excellence. Introduction Introduction ExitForwardBack Logo Spacing Typography Color Palette Key Brand

Engman, David M.

81

BTOLOGY OF THE PORCUPINE (ERETHIZON DORSATUM) IN NORTHWESTERN SOUTH DAKOTA  

E-print Network

BTOLOGY OF THE PORCUPINE (ERETHIZON DORSATUM) IN NORTHWESTERN SOUTH DAKOTA by Judith Johnson in Wildlife and Fisheries Science South Dakota State University 1977 #12;BIOLOGY OF THE PORCUPINE (ERETHIZON DORSATUM) IN NORTHWESTERN SOUTH DAKOTA This thesis is approved as a.creditable and independent

82

AT NORTHWESTERN The history of Chicago is about bigness--  

E-print Network

it champions. This is not a city for the meek or the weak. The poet Carl Sandburg in "Chicago" coined as chronic diseases. Investment in academic medical centers, like Northwestern Medicine, also transforms more of the country's premier academic medical center hospitals and the primary teaching affiliate for Northwestern

Engman, David M.

83

Northwestern researchers discover 'two-faced' cells in colon cancer  

Cancer.gov

Northwestern Medicine researchers have discovered a "two-faced" group of cells at work in human colon cancer, with opposing functions that can suppress or promote tumor growth. These cells are a subset of T-regulatory (Treg) cells, known to suppress immune responses in healthy individuals. Northwestern University is home to the Robert H. Lurie Comprehensive Cancer Center.

84

UNDERGRADUATE RESEARCH IN NANOTECHNOLOGY Mark C. Hersam, Northwestern University  

E-print Network

UNDERGRADUATE RESEARCH IN NANOTECHNOLOGY Mark C. Hersam, Northwestern University Northwestern in interdisciplinary nanoscience and nanotechnology is crucial for the U.S. to remain a competitive leader and nanotechnology each summer since 2002. During the nineweek summer program, participants work fulltime

Shull, Kenneth R.

85

Multi Site Cardiac Rehabilitation Programming for Residents of Northwestern Ontario  

Microsoft Academic Search

Northwestern Ontario (NWO), Canada is a geographical region with a landmass equivalent to the country of France. The region is comprised of approximately 250,000 residents with 50% residing in sparsely populated rural areas, each challenged by limited professional resources to provide health-based programs for their residents. In 2003, the Northwestern Ontario District Health Council (NWODHC) identified inequities in the delivery

Gwen Third; Lori Marshall; Caterina Kmill; Catherine Collinson; Laurie Sherrington; Darlene Steven

2009-01-01

86

Internship Search Timeline University Career Services Northwestern University  

E-print Network

Internship Search Timeline University Career Services Northwestern University Research your is a general internship search timeline designed to help you organize and conduct an effective internship search. September/October Register with Northwestern's CareerCat and iNet. Sign-up for the Internship

Shull, Kenneth R.

87

Internship Search Survey 2011 Northwestern University Career Services  

E-print Network

Internship Search Survey 2011 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

Shull, Kenneth R.

88

Internship Search Survey 2010 Northwestern University Career Services  

E-print Network

Internship Search Survey 2010 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from StudentVoice, an online

Shull, Kenneth R.

89

Internship Search Survey 2011-2012 Northwestern University Career Services  

E-print Network

Internship Search Survey 2011-2012 Northwestern University Career Services Executive Summary The Internship Search Survey conducted by Northwestern University Career Services (UCS) was formally introduced searching for an internship. The survey was hosted and data was collected from Campus Labs, an online survey

Shull, Kenneth R.

90

Summer Internship Grant Program (SIGP) University Career Services Northwestern University  

E-print Network

Summer Internship Grant Program (SIGP) University Career Services Northwestern University Facebook to develop SIGP to fund stipends for students completing unpaid summer internships. In addition to money of $2500 each for students completing unpaid summer internships. Who is eligible for SIGP? Any Northwestern

Shull, Kenneth R.

91

Geology and petroleum resources of northwestern Africa  

SciTech Connect

The main onshore basins of northwestern Africa are (1) basins in the Atlas folded geosynclinal belt adjacent to the Mediterranean Sea, (2) the Tindouf, Bechar, and Reggane basins of western Algeria and southern Morocco, and (3) the Taoudeni basin of Mauritania and Mali. Coastal basins are (1) the Essaouria basin of southwestern Morocco, (2) the Tarfaya basin of Western Sahara, (3) the Senegal basin of Senegal and western Mauritania, (4) the Sierra Leone-Liberia basin, and (5) the Ivory Coast basin. The petroleum geology and resource potential of these basins is detailed.

Peterson, J.A.; Klemme, H.D.

1986-05-01

92

Digital surfaces and thicknesses of selected hydrogeologic units within the Ozark Plateaus aquifer system, northwestern Arkansas  

USGS Publications Warehouse

Digital surfaces and thicknesses of nine hydrogeologic units of the Ozark Plateaus aquifer system from land surface to the top of the Gunter Sandstone in northwestern Arkansas were created using geophysical logs, drillers’ logs, geologist-interpreted formation tops, and previously published maps. The 6,040 square mile study area in the Ozark Plateaus Province includes Benton, Washington, Carroll, Madison, Boone, Newton, Marion, and Searcy Counties. The top of each hydrogeologic unit delineated on geophysical logs was based partly on previously published reports and maps and also from drillers’ logs. These logs were then used as a basis to contour digital surfaces showing the top and thickness of the Fayetteville Shale, the Boone Formation, the Chattanooga Shale, the Everton Formation, the Powell Dolomite, the Cotter Dolomite, the Roubidoux Formation, the Gasconade Dolomite, and the Gunter Sandstone.

Czarnecki, John B.; Bolyard, Susan E.; Hart, Rheannon M.; Clark, Jimmy M.

2014-01-01

93

The hydrocarbon potential, thermal maturity, sequence stratigraphic setting and depositional palaeoenvironment of carbonaceous shale and lignite successions of Panandhro, northwestern Kutch Basin, Gujarat, Western India  

Microsoft Academic Search

The objective of the present paper is to provide geochemical and palynological data to characterize lignites and carbonaceous shales from Panandhro, northwestern Kutch Basin, Gujarat, Western India, in terms of their hydrocarbon potential, thermal maturity, sequence stratigraphic settings and depositional palaeoenvironment. The samples, collected in Panandhro lignite mine, belong to Naredi Formation of Late Paleocene-Early Eocene age. The geochemical results

Vinay K. Sahay

2011-01-01

94

Post-convection spreading phase in the Northwestern Mediterranean Sea  

NASA Astrophysics Data System (ADS)

This is a study about the spreading of newly formed deep waters following open ocean deep convection in the Northwestern Mediterranean Sea. The main results are from the SOFARGOS large scale float experiment initiated in 1994-1995. During the SOFARGOS project, CTD stations and Lagrangian observations of ocean currents were carried out in the Gulf of Lion from December 1994 to July 1995. Hydrological observations confirmed that deep water formation occurred very early during winter 1994-1995 (late December, early January) in conjunction with atmospheric cooling, deep convection penetrating down to 2000 m in the so-called Medoc area. Numerous eddies (both anticyclonic and cyclonic) drifted away from the convection area and advected newly formed deep waters far away from the source region. In particular, compact anticyclones appeared to be the most coherent (long-lived) eddies and capable of transporting newly formed Western Mediterranean Deep Waters several hundreds of kilometers away from the convection area. Characterized by an inner core of about 5 km in radius, these eddies are submesoscale features in the outer domain and appear as key elements of the open ocean convection processes. During their long journeys, these eddies interacted with larger scale features such as the Northern Boundary Current, the North Balearic Front, topographic Rossby waves, and Sardinian eddies. These interactions influenced the long-term behavior of the eddies (mean drift, composition) and represented an important part of (1) the spreading phase following deep convection and (2) the large scale thermohaline circulation.

Testor, P.; Gascard, J.-C.

2006-05-01

95

Cysticercosis of slaughtered cattle in northwestern Ethiopia.  

PubMed

The occurrence of cysticercosis due to Taenia saginata in cattle slaughtered for meat in Amhara National Regional State, northwestern Ethiopia between September 2005 and February 2007 was investigated. Routine meat inspection of various organs of 4456 cattle in eight abattoirs of this region showed that 824 (18.49%) were infected with Cysticercus bovis. The occurrence rate did not vary significantly from abattoir to abattoir (P>0.5). The tongue, masseter muscles, heart muscles, triceps muscles and thigh muscles were the main predilection sites of the cysts. Of 4102 male cattle, examined, 768 (18.72%) had cysts of C. bovis while 56 (15.82%) of the 354 female animals investigated were infected. The animals slaughtered were all adults. No significant difference in occurrence was recorded between the sexes. Monthly occurrence of the cysts in the animals revealed a rise of infected animals during the dry season. PMID:18321540

Kebede, Nigatu

2008-12-01

96

Northwestern Mexico as photographed from Skylab  

NASA Technical Reports Server (NTRS)

An oblique view of northwestern Mexico (30.0N, 113.5W), as photographed from the Skylab space station in Earth orbit by one of the Skylab 4 crewmen. This photograph was taken on a seep down the coast to document the fault patterns of southern California and northwest Mexico. The specific reason for the picture was to see of the Agua Blanca Fault in Baja California extends to the east toward the Gulf of California. No such extension was found. The fault appeard to disappear into an area of sand and heavily eroded material that obscured any feature that might be present deeper. This area of sand and loose material is the light-colored area in the center of Baja at the extreme north part of the photograph.

1975-01-01

97

Solimoes megashear: Intraplate tectonics in northwestern Brazil  

SciTech Connect

A belt of deformation in the Solimoes basin of northwestern Brazil extends east-northeast from near the Peruvian border for about 1300 km. The belt is characterized by the en echelon arrangement of folds and faults interpreted as the result of right-slip displacements in a transpressive regime. The structures were formed during Late Jurassic time, probably due to collision of South America with allochthonous terranes as the opening of the South Atlantic Ocean began. The Iquitos arch near the western end of the megashear separates the Solimoes basin from Subandean basins. The development of the Iquitos arch is interpreted to be related to orogenic loading along western South America by the Andean mountain belt. In Brazil, folds and faults associated with the Solimoes megashear hold hydrocarbons within Paleozoic strata, and 15 gas and oil fields have so far been discovered.

Caputo, M.V. (Petroleo Brasileiro S.A.-Petrobras, Belem, Para (BRAZIL))

1991-03-01

98

Geomorphological context of the basins of Northwestern Peninsular Malaysia  

NASA Astrophysics Data System (ADS)

Geomorphological context of the basins of Northwestern Peninsular Malaysia Benjamin Sautter, Manuel Pubellier, David Menier Department of Petroleum Geosciences, Universiti Teknologi PETRONAS CNRS-UMR 8538, Ecole Normale Supérieure, 24, Rue Lhomond, 75231, Paris Cedex 05, France Petroleum basins of Western Malaysia are poorly known and their formation is controlled by the Tertiary stress variations applied on Mesozoic basement structures. Among these are the Paleozoic-Mesozoic Bentong Raub, Inthanon, and Nan suture zones. By the end of Mesozoic times, the arrival of Indian plate was accompanied by strike slip deformation, accommodated by several Major Faults (Sagaing, Three Pagodas, Mae Ping, Red River, Ranong and Klong Marui Faults). Due to changes in the boundary forces, these areas of weakness (faults) were reactivated during the Tertiary, leading to the opening of basins in most of Sundaland. Within this framework, while most of the Sundaland records stretching of the crust and opening of basins (SCS, Malay, Penyu, Natuna, Mergui) during the Cenozoics, Peninsular Malaysia and the Strait of Malacca are considered to be in tectonic quiescence by most of the authors. We present the geomorphology of the Northwestern Malaysia Peninsula with emphasis on the deformations onshore from the Bentong Raub Suture Zone to the Bok Bak Fault, via the Kinta Valley, and offshore from the Port Klang Graben to the North Penang Graben. By analyzing Digital Elevation Model from ASTER and SRTM data, two main directions of fractures in the granitic plutons are highlighted: NW-SE to W-E sigmoidal faults and N-S to NE-SW linear fractures which seem to cross-cut the others. In the field in the area of the Kinta Valley (Western Belt, NW Peninsular Malaysia), granitic bodies show intense fracturation reflecting several stages of deformation. The granites are generally syntectonic and do not cut fully across the Late Paleozoic platform limestone. Two sets of fractures (NW-SE and NE-SW) appear more penetrative in both granitic and limestone units. On most of the studied outcrops, exfoliation fractures are reactivated into normal faults. Deformation is particularly severe at the contact of the granites and the sediments which is underlined by cataclasic quartz dykes and hornfelds. Off-shore, in the Straits of Malacca, nine tertiary half-grabens are present, all oriented in N-S to NE-SW direction with N-S boundary faults on their western margin. We propose a tectonic scenario for the north-western Malaysia Peninsula according to which the northward motion of India induced first right-lateral transpressionnal tectonics at the End of the Mesozoics (Cretaceous early Tertiary). This system is illustrated in the NW-SE trending fractures of the Main Range Batholith and other Triassic plutons within a system bounded and controlled by the Bok Bak Fault, the KL fault zone and the Bentong Raub Suture Zone. Later, a second stage of transtension led to the opening of the en echelon onshore basins in a tear-faults system, and to the opening of half grabens offshore in the Straits of Malacca.

Sautter, Benjamin; Pubellier, Manuel; Menier, David

2014-05-01

99

DETAIL OF NORTHWESTERN CORNER, WEST FACADE, SHOWING WINDOW AND LOADING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DETAIL OF NORTHWESTERN CORNER, WEST FACADE, SHOWING WINDOW AND LOADING DOCK RAMP, LOOKING SOUTH - Eglin Air Force Base, Motor Repair Shop, Northwest of Flager Road, Chisk Lane & southern edge of Weekly Bayou, Valparaiso, Okaloosa County, FL

100

2014 WEEKLY BULLETIN DEPARTMENT OF CHEMISTRY, NORTHWESTERN UNIVERSITY  

E-print Network

, 2014 For full schedule, including Center events, please see the Department Calendar: http://www.chemistry.northwestern.edu/events/calendar as part of their Ph.D./postdoctoral training, are fluent in both English and Chinese, and are willing

Grzybowski, Bartosz A.

101

2014 WEEKLY BULLETIN DEPARTMENT OF CHEMISTRY, NORTHWESTERN UNIVERSITY  

E-print Network

, 2014 For full schedule, including Center events, please see the Department Calendar: http://www.chemistry.northwestern.edu/events/calendar and Chinese, and are willing to relocate to China. We have the openings posted on our company website

Grzybowski, Bartosz A.

102

FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

FACING SOUTH OF LANDSCAPING IN NORTHWESTERN PORTION OF PARK - Candler Park Historic District, Roughly bounded by Moreland, Dekalb, McLendon & Harold Avenues, Matthews Street & Clifton Terrace, Atlanta, Fulton County, GA

103

MISR Images Wildfires in Northwestern US  

NASA Technical Reports Server (NTRS)

MISR image of smoke plumes from devastating wildfires in the northwestern US. This view of the Clearwater and Salmon River Mountains in Idaho was acquired on August 5, 2000 (Terra orbit 3370). The body of water to the left of image center is the Cascade Reservoir, located about 100 km north of Boise and 80 km east of the Snake River. North is at the top, and the image is approximately 380 km across.

In addition to the huge plumes traversing the mountains in the northern part of the image, smoke accumulating in the lower elevation canyons and plains is visible. This image was generated using data from the MISR camera that looks forward at a steep angle (70.5 degrees). The smoke is far more visible when viewed at this highly oblique angle than it would be in a conventional, straight-downward view. In creating this color composite, data from the blue and green MISR bands, acquired at 1.1-km spatial resolution, were digitally 'sharpened' using 275-m resolution data acquired in the red band.

MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Office of Earth Science, Washington, DC. The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.

For more information: http://www-misr.jpl.nasa.gov

2000-01-01

104

Northwestern Tharsis Latent Outflow Activity Mars  

NASA Astrophysics Data System (ADS)

Previously defined outflow channels, which are indicated by relict landforms similar to those observed on Earth, signify ancient catastrophic flood events on Mars. These conspicuous geomorphic features are some of the most remarkable yet profound discoveries made by geologists to date. These outflow channels, which debouched tremendous volumes of water into topographic lows such as Chryse, Utopia, Elysium, and Hellas Planitiae, may represent the beginning of warmer and wetter climatic periods unlike the present-day cold and dry Mars. In addition to the previously identified outflow channels, observations permitted by the newly acquired Mars Orbiter Laser Altimeter (MOLA) data have revealed a system of gigantic valleys, referred to as the northwestern slope valleys (NSV), that are located to the northwest of a huge shield volcano, Arsia Mons, western hemisphere of Mars. These features generally correspond spatially to gravity lows similar to the easternmost, circum-Chryse outflow channel systems. Geologic investigations of the Tharsis region suggest that the large valley system pre-dates the construction of Arsia Mons and its extensive associated lava flows of mainly Late Hesperian and Amazonian age and coincides stratigraphically with the early development of the circum-Chryse outflow channel systems that debouch into Chryse Planitia. This newly identified system, the NSV, potentially signifies the largest flood event(s) ever recorded for the solar system. Additional information is contained in original extended abstract.

Dohm, J. M.; Anderson, R. C.; Baker, V. R.; Ferris, J. C.; Hare, T. M.; Strom, R. G.; Rudd, L.; Rice, J. W., Jr.; Scott, D. H.

2000-08-01

105

Northwestern Tharsis Latent Outflow Activity Mars  

NASA Technical Reports Server (NTRS)

Previously defined outflow channels, which are indicated by relict landforms similar to those observed on Earth, signify ancient catastrophic flood events on Mars. These conspicuous geomorphic features are some of the most remarkable yet profound discoveries made by geologists to date. These outflow channels, which debouched tremendous volumes of water into topographic lows such as Chryse, Utopia, Elysium, and Hellas Planitiae, may represent the beginning of warmer and wetter climatic periods unlike the present-day cold and dry Mars. In addition to the previously identified outflow channels, observations permitted by the newly acquired Mars Orbiter Laser Altimeter (MOLA) data have revealed a system of gigantic valleys, referred to as the northwestern slope valleys (NSV), that are located to the northwest of a huge shield volcano, Arsia Mons, western hemisphere of Mars. These features generally correspond spatially to gravity lows similar to the easternmost, circum-Chryse outflow channel systems. Geologic investigations of the Tharsis region suggest that the large valley system pre-dates the construction of Arsia Mons and its extensive associated lava flows of mainly Late Hesperian and Amazonian age and coincides stratigraphically with the early development of the circum-Chryse outflow channel systems that debouch into Chryse Planitia. This newly identified system, the NSV, potentially signifies the largest flood event(s) ever recorded for the solar system. Additional information is contained in original extended abstract.

Dohm, J. M.; Anderson, R. C.; Baker, V. R.; Ferris, J. C.; Hare, T. M.; Strom, R. G.; Rudd, L.; Rice, J. W., Jr.; Scott, D. H.

2000-01-01

106

75 FR 1597 - Western Pacific Crustacean Fisheries; 2010 Northwestern Hawaiian Islands Lobster Harvest Guideline  

Federal Register 2010, 2011, 2012, 2013, 2014

...Fisheries; 2010 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine...Commerce. ACTION: Notification of lobster harvest guideline...annual harvest guideline for the commercial lobster fishery in the Northwestern Hawaiian...

2010-01-12

107

77 FR 5585 - Northwestern Mutual Series Fund, Inc. and Mason Street Advisors, LLC; Notice of Application  

Federal Register 2010, 2011, 2012, 2013, 2014

...812-13982] Northwestern Mutual Series Fund, Inc. and Mason Street Advisors, LLC; Notice of Application January 30, 2012...Northwestern Mutual Series Fund, Inc. (``Company'') and Mason Street Advisors, LLC (``MSA''). DATES: Filing...

2012-02-03

108

The Heuristic Reasoning Manifesto Praveen K. Paritosh (paritosh@cs.northwestern.edu)  

E-print Network

The Heuristic Reasoning Manifesto Praveen K. Paritosh (paritosh@cs.northwestern.edu) Qualitative Reasoning Group, Northwestern University, Evanston IL 60208. Abstract We argue for heuristic reasoning as a solution to the brittleness problem. Heuristic reasoning methods exploit the information processing

Bailey-Kellogg, Chris

109

The Heuristic Reasoning Manifesto Praveen K. Paritosh (paritosh@cs.northwestern.edu)  

E-print Network

The Heuristic Reasoning Manifesto Praveen K. Paritosh (paritosh@cs.northwestern.edu) Qualitative Reasoning Group, Electrical Engineering and Computer Science Northwestern University, Evanston IL 60208. Abstract We argue for heuristic reasoning as a solution to the brittleness problem. Heuristic reasoning

Forbus, Kenneth D.

110

Development of the Permian-Triassic unconformity in southwestern Utah, southeastern Nevada and northwestern Arizona  

SciTech Connect

Development of positive areas, that are oriented northwest-southeast in south-western Utah, southeastern Nevada, and northwestern Arizona, are indicated by the depositional patterns of the Rock Canyon Conglomerate and facies changes produced by on-lapping during the deposition of the Timpoweap, Lower Red, and Virgin Limestone Members of the Moenkopi Formation. The lack of facies change in the Kaibab Formation indicates that uplift of the positive areas did not start during the early Permian. The Fossil Mountain Member of the Kaibab Formation, is a marker of continuous shallow marine sedimentation across the area. The Harrisburg Member contains three limestone units, separated by gypsum and shale units, that represent regressions and transgressions. Where the gypsum in the Kaibab Formation thins, collapse breccia and deformed shale units are present indicating that the gypsum was deposited and then removed by dissolution. Channels cut during the late Permian and early Triassic Periods do not cut through the Harrisburg Member of the Kaibab Formation. West of St. George, Utah, where the gypsum deposits are thickest, is the location where Timpoweap, Lower Red, and Virgin Limestone members thin and are absent. Late Permian and early Triassic topography may have in part been controlled by dissolution of the gypsum deposits in the Kaibab Formation. The low angle of discordance between Permian and Triassic units indicated that the area was not subjected to major deformation during the late Permian and early Triassic, but was gently tilted and uplifted.

Nielson, R.L. (Stephen F. Austin State Univ., Nacogdoches, TX (United States). Dept. of Geology)

1993-04-01

111

Middle Proterozoic compressional orogen in northwestern Canada  

NASA Astrophysics Data System (ADS)

Evidence from seismic reflection profiling, drill holes, potential field measurements and regional geology shows that an east verging Proterozoic thin-skinned thrust and fold belt is situated beneath the Interior Platform of northwestern Canada. Balanced cross sections and associated palinspastic reconstructions provide constraints on the extent of the shortening in the thrust belt and suggest that at least 50-90 km of compression can be accounted for. Although the Proterozoic stratigraphy in the subsurface is not well known, the cross sections are constrained essentially by seismic reflection geometry. Shortening occurred on subhorizontal detachment(s) that lie above the autochthonous (Hudsonian?) basement. Seismic reflection data from the area west of the major thin-skinned thrust structures show that the Proterozoic strata there can be traced for up to 100 km and are characterized by broad, open folds with wavelengths of 10 km or more. Uniform potential field anomalies and subhorizontal seismic reflections further indicate that there are no major crustal boundaries (such as sutures) in the area between the thrust belt and the Campbell uplift near Inuvik, Northwest Territories, that were associated with the thrusting. The detachment(s) that carried the folded and thrust faulted allochthons must therefore extend for a considerable distance to the northwest of the thrust belt. New deep crustal seismic reflection data from the Campbell uplift, however, show evidence for crustalpenetrating Proterozoic structures that dip northwestward and that were probably reactivated during late Paleozoic compression and Mesozoic extension. Taken together, the various data thus indicate that the area from Great Bear Lake to the Campbell uplift (about 400 km) is underlain by a mid-Proterozoic decollement above which the compressional deformation took place, and that the deformation extended to the north side of the present Campbell uplift where steeply north dipping structures indicate that the underlying autochthonous basement is characterized by a ramp structure that was probably associated with the southern edge of a Proterozoic basin.

Cook, Frederick A.

1988-08-01

112

2010 Murphy Society Student Funded Projects: MBECC 2011 Northwestern University Biomedical Engineering Society Student Chapter  

E-print Network

programs at local schools and town beautification activities. Northwestern Solar Car Team Rebecca Puttkammer, Treasurer, Northwestern Solar Car Team The mission statement of the Northwestern Solar Car Team and efficient energy. Through its creation in 1997, NUsolar has done exactly that and constructed 5 solar

MacIver, Malcolm A.

113

Northwestern University Archives 110 Deering Library (847) 491-3354 or (847) 491-3136  

E-print Network

-Friday, 8:30-5 http://www.library.northwestern.edu/archives Northwestern University in World War I: A Guide German) · George R. Baker, Heroes and Angels: Diary, A Medic Remembers World War I, France and Belgium/2 (These records document Northwestern's contributions during both World Wars, including government use

114

Incidence of narcotic abuse during pregnancy in northwestern Ontario  

PubMed Central

Abstract Objective To document the incidence and outcomes of narcotic use during pregnancy in northwestern Ontario. Design Three-year prospective cohort study. Setting Sioux Lookout and surrounding communities in northwestern Ontario. Participants A total of 1206 consecutive births in a catchment area of 28 000 First Nations patients. Main outcome measures Incidence of narcotic use, and maternal and neonatal outcomes. Results Incidence of narcotic use in pregnancy has risen to 28.6% (P < .001) and incidence of neonatal abstinence syndrome has fallen to 18.0% of narcotic-exposed births (P = .003). Daily intravenous drug use is now a common pattern of abuse. Conclusion Narcotic abuse in pregnancy has dramatically increased in northwestern Ontario. Neonatal outcomes have improved as a result of a family medicine–based prenatal and obstetric program that includes a narcotic replacement and tapering program. PMID:25316764

Kelly, Len; Guilfoyle, John; Dooley, Joe; Antone, Irwin; Gerber-Finn, Lianne; Dooley, Roisin; Brunton, Nicole; Kakegamuck, Kara; Muileboom, Jill; Hopman, Wilma; Cromarty, Helen; Linkewich, Barb; Maki, Jennifer

2014-01-01

115

Novel poxvirus in big brown bats, northwestern United States.  

PubMed

A wildlife hospital and rehabilitation center in northwestern United States received several big brown bats with necrosuppurative osteomyelitis in multiple joints. Wing and joint tissues were positive by PCR for poxvirus. Thin-section electron microscopy showed poxvirus particles within A-type inclusions. Phylogenetic comparison supports establishment of a new genus of Poxviridae. PMID:23735421

Emerson, Ginny L; Nordhausen, Robert; Garner, Michael M; Huckabee, John R; Johnson, Steven; Wohrle, Ron D; Davidson, Whitni B; Wilkins, Kimberly; Li, Yu; Doty, Jeffrey B; Gallardo-Romero, Nadia F; Metcalfe, Maureen G; Karem, Kevin L; Damon, Inger K; Carroll, Darin S

2013-06-01

116

Novel Poxvirus in Big Brown Bats, Northwestern United States  

PubMed Central

A wildlife hospital and rehabilitation center in northwestern United States received several big brown bats with necrosuppurative osteomyelitis in multiple joints. Wing and joint tissues were positive by PCR for poxvirus. Thin-section electron microscopy showed poxvirus particles within A-type inclusions. Phylogenetic comparison supports establishment of a new genus of Poxviridae. PMID:23735421

Nordhausen, Robert; Garner, Michael M.; Huckabee, John R.; Johnson, Steven; Wohrle, Ron D.; Davidson, Whitni B.; Wilkins, Kimberly; Li, Yu; Doty, Jeffrey B.; Gallardo-Romero, Nadia F.; Metcalfe, Maureen G.; Karem, Kevin L.; Damon, Inger K.; Carroll, Darin S.

2013-01-01

117

Feinberg Fact Sheet Northwestern University Feinberg School of Medicine  

E-print Network

Northwestern University Feinberg School of Medicine #12;Feinberg Fact Sheet Location On the lakefront Information Class of 2015 Medical Students Class of 2015: 54% men, 46% women; *45% minority, 9% non. Global Health Opportunities Medical students can engage in global clinical experiences at one of 18

Chisholm, Rex L.

118

Petroleum exploration in Absaroka basin of northwestern Wyoming  

Microsoft Academic Search

A new, virtually unexplored petroleum province with large potential resources can be defined in northwestern Wyoming. Structurally, the Absaroka basin is bounded on the north by the Beartooth uplift, to the west by the Gallatin and Washakie uplifts, to the south by the Washakie and Owl Creek uplifts, and to the east by the Cody arch. The Cody arch connects

Sundell

1986-01-01

119

The Northwestern University Transportation Center presents: Sergio Jara-Diaz  

E-print Network

The Northwestern University Transportation Center presents: Sergio Jara-Diaz Department of Civil Engineering Universidad de Chile Optimal Design and Pricing of Public Transport (still crazy after all design (frequency, bus size, lines structure and others), optimal pricing-subsidies and the policy

Bustamante, Fabián E.

120

Policy on Gifts to Northwestern University from Faculty and Staff  

E-print Network

Page 1 Policy on Gifts to Northwestern University from Faculty and Staff Policy Statement Under IRS, and that appropriate independent oversight is given to the disposition of gifts, all gifts from faculty and staff must to any accounts that such immediate family member may control.) As with all gifts, donations from

Shahriar, Selim

121

Estimating salinity to complement observed temperature: 2.Northwestern Atlantic  

E-print Network

Estimating salinity to complement observed temperature: 2.Northwestern Atlantic W.C. Thacker a,, L This paper addresses the problem of estimating salinity for a large region in the Atlantic Ocean containing salinity to complement observed temperature: 1. Gulf of Mexico. Journal of Marine Systems. doi:10.1016/j

122

Natural gases in mercury deposits of Donbass and Northwestern Caucasus  

SciTech Connect

A short review of information on the composition and genesis of natural gases in the Northwestern Caucasus and Donbass mercury deposits is presented. These differences in gas composition, as well as the distinct predominance of carbon dioxide and hydrogen in hydrothermally altered rocks, may be used for predicting gas-bearing capacity of deposits and for mercury prospecting in new areas. (JMT)

Fridman, A.I.; Makhlova, N.K.; Plotnikov, I.A.

1981-02-01

123

SOME IMPORTANT PROPERTIES AND CLASSIFICATION OF MOLLISOLS IN NORTHWESTERN TURKEY  

Microsoft Academic Search

Mollisols have developed under xeric moisture and thermic temperature regimes in northwestern Turkey. Six soil profiles were studied in this research. The morphological, physical and chemical properties of the soils were investigated and classified according to USDA Soil Taxonomy. The examined soils were showed some variations in their morphological, physical and chemical properties as a result of differences in mean

CUMHUR AYDINALP

2003-01-01

124

PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE  

E-print Network

PAIN MEDICINE CENTER INSTITUTE FOR TRANSLATIONAL NEUROSCIENCE AT NORTHWESTERN MEDICINE Pain is the #1 reason that Americans visit a doctor. Often, pain will go away on its own, but in many cases it becomes chronic and debilitating. Approximately 15 percent of Americans report daily chronic back pain

Engman, David M.

125

Predicting Debris-Slide Locations in Northwestern California1  

E-print Network

Predicting Debris-Slide Locations in Northwestern California1 Mark E. Reid,2 Stephen D. Ellen,3 tested four topographic models for predicting locations of debris-slide sources: 1) slope; 2) proximity to stream; 3) SHALSTAB with "standard" parameters; and 4) debris-slide-prone landforms, which delineates

Standiford, Richard B.

126

Northwestern EECS 213 SETI Lab (Beta Test 2)  

E-print Network

Northwestern EECS 213 SETI Lab (Beta Test 2) Spring 2014 The Search for Extraterrestrial Intelligence (SETI) is a long-standing international effort to try to find alien was that this would hold true for other intelligent civilizations. They may, in fact

Dinda, Peter A.

127

NORTHWESTERN UNIVERSITY Reconstructions on Strontium Titanate (110) Surfaces  

E-print Network

NORTHWESTERN UNIVERSITY Reconstructions on Strontium Titanate (110) Surfaces at Various Annealing August 2011 #12;1 Abstract Reconstructions on Strontium Titanate (110) Surfaces at Various Annealing Conditions Alicia Loon Strontium titanate (SrTiO3) is a perovskite complex metal oxide used in many different

Shull, Kenneth R.

128

Rangewide landscape genetics of an endemic Pacific northwestern salamander  

E-print Network

Rangewide landscape genetics of an endemic Pacific northwestern salamander DARYL R. TRUMBO landscape genetics studies are rarely spatially replicated. The Cope's giant salamander (Dicamptodon copei in the northern coastal portions of the range had relatively high gene flow, largely facilitated by stream

Storfer, Andrew

129

New provincial records of skinks (Squamata: Scincidae) from northwestern Vietnam  

PubMed Central

Abstract We report six new records of skinks from northwestern Vietnam: Eutropis macularius, Scincella devorator, S. monticola, S. ochracea, Sphenomorphus cryptotis and S. indicus. Our new findings increase the species number of skinks (Scincidae) to nine in Dien Bien Province and to 14 in Son La Province. We also provide additional natural history data of aforementioned species.

Pham, Anh Van; Le, Dzung Trung; Nguyen, Son Lan Hung; Ziegler, Thomas

2015-01-01

130

Northwestern University Feinberg School of Medicine Genomic Literacy  

E-print Network

Northwestern University Feinberg School of Medicine Genomic Literacy How Much is Enough? (and how, and Genomic Literacy: Contributions from Health Science Libraries #12;Veterinarians & their Clients "White;Hatscaps.name Librarians' genomic literacy · Special education not always required · Learn what types

Napp, Nils

131

Beak deformities in Northwestern Crows: evidence of a multispecies epizootic  

USGS Publications Warehouse

Beak abnormalities are rare among adult birds and, typically, are not widespread in a given population, within a region, or across multiple species. A high concentration of beak deformities was recently documented in Black-capped Chickadees (Poecile atricapillus) and other resident avian species in Alaska. We describe a parallel condition in Northwestern Crows (Corvus caurinus) that signals the emergence of a multispecies epizootic. On the basis of 186 Northwestern Crows captured at six sites in Alaska during 2007 and 2008, we estimated the prevalence of beak deformities in adults to be 16.9 ± 5.3%, the highest rate of gross deformities ever recorded in a wild bird population. Prevalence varied among sites and was as high as 36% on the Kenai Peninsula, which suggests possible epizootic clusters. We also documented beak abnormalities in an additional 148 Northwestern Crows in south-central and southeastern Alaska and in 64 crows near Vancouver, British Columbia, and Puget Sound, Washington, a region where both Northwestern Crows and American Crows (C. brachyrhynchos) occur. The increase in frequency and distribution of crows observed with abnormal beaks throughout the Pacific Northwest since the late 1990s indicates a geographic expansion of this problem. Affected crows exhibited elongated and often crossed beaks that were morphologically similar to deformities documented in Black-capped Chickadees and other species in Alaska over approximately the same period. Additional research is needed to determine the etiology and potential adverse effects on bird populations affected by this disorder.

Van Hemert, Caroline; Handel, Colleen M.

2010-01-01

132

Ordovician acritarch assemblages from central and northwestern Saudi Arabia  

Microsoft Academic Search

A preliminary account of acritarch populations derived from three oil exploration boreholes in central and northwestern Saudi Arabia ranging in age from Tremadoc to early Ashgill is given. Comparisons are made with assemblages of similar age in North Africa and northwest Europe.

Monika Jachowicz

1995-01-01

133

Firefuelclimate linkages in the northwestern USA during the Holocene  

E-print Network

in the abundance of sedimentary charcoal found in lake and bog sediments. When analysed with pollen data-resolution charcoal records generally involves the decomposition of charcoal influx into (a) a slowly varying. In this study, 15 high-resolution charcoal records from the northwestern USA and associated pollen data were

Whitlock, Cathy L.

134

Departments | Centers | Institutes Northwestern University Feinberg School of Medicine  

E-print Network

and the Northwestern Brain Tumor Institute, among others. Some of our strongest centers and institutes highlight specialized areas of expertise. They include the following: Comprehensive Transplant Center· Robert H. Lurie Research Center Cognitive Neurology and Alzheimer's Disease Center Comprehensive Transplant Center

Chisholm, Rex L.

135

NORTHWESTERN UNIVERSITY Wireless Sensor Networks for Crack Displacement Measurement  

E-print Network

............................................................................................... 56 #12;3.3.1.1 Sensor Displacement and Temperature Variations with time...................... 57 3.3.1.2 Comparison of sensor response with theoretical displacement ................... 59 3.3.1.3 ComparisonNORTHWESTERN UNIVERSITY Wireless Sensor Networks for Crack Displacement Measurement A Thesis

136

Mountain goat response to hydroelectric exploration in northwestern British Columbia  

Microsoft Academic Search

The behavioral responses of more than 800 mountain goats, comprised of 195 social groups, were recorded during hydroelectric exploration activities (primarily aircraft) in northwestern British Columbia. Four categories of overt response were recorded during case tests, ranging from maintenance activity to severe flight. More than 80 percent ( n=667) of the observed goats elicited some form of behavioral stress-response, with

Bryan R. Foster; Engel Y. Rahs

1983-01-01

137

Mountain goat response to hydroelectric exploration in northwestern British Columbia  

Microsoft Academic Search

The behavioral responses of more than 800 mountain goats, comprised of 195 social groups, were recorded during hydroelectric exploration activities (primarily aircraft) in northwestern British Columbia. Four categories of overt response were recorded during case tests, ranging from maintenance activity to severe flight. More than 80 percent (n=667) of the observed goats elicited some form of behavioral stress-response, with 33

Bryan R. Foster; Engel Y. Rahs

1983-01-01

138

CUTANEOUS LYMPHOMAS THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE  

E-print Network

with an estimated incidence of 4,500 new cases diagnosed in the U.S. each year. Yet, like other skin cancersCUTANEOUS LYMPHOMAS THE CANCER INSTITUTES AT NORTHWESTERN MEDICINE Cutaneous lymphomas are rare, the incidence of skin lymphomas is also rising. A recent study found that the incidence of cutaneous lymphomas

Engman, David M.

139

Internship Search Survey 2009 Northwestern University Career Services  

E-print Network

Internship Search Survey 2009 Northwestern University Career Services Collected from Student of 2012 91 Class of 2009 46 Class of 2013 2 The Internship Search Approximately, to how many internships did you apply? (N=516) 1-5 Internships 234 45.35% 6-10 Internships 96 18.6% When did you start your

Shull, Kenneth R.

140

The hydrocarbon potential, thermal maturity, sequence stratigraphic setting and depositional palaeoenvironment of carbonaceous shale and lignite successions of Panandhro, northwestern Kutch Basin, Gujarat, Western India  

Microsoft Academic Search

The objective of the present paper is to provide geochemical and palynological data to characterize lignites and carbonaceous\\u000a shales from Panandhro, northwestern Kutch Basin, Gujarat, Western India, in terms of their hydrocarbon potential, thermal\\u000a maturity, sequence stratigraphic settings and depositional palaeoenvironment. The samples, collected in Panandhro lignite\\u000a mine, belong to Naredi Formation of Late Paleocene-Early Eocene age. The geochemical results

Vinay K. Sahay

2011-01-01

141

The hydrocarbon potential, thermal maturity, sequence stratigraphic setting and depositional palaeoenvironment of carbonaceous shale and lignite successions of Panandhro, northwestern Kutch Basin, Gujarat, Western India  

Microsoft Academic Search

The objective of the present paper is to provide geochemical and palynological data to characterize lignites and carbonaceous\\u000a shales from Panandhro, northwestern Kutch Basin, Gujarat, Western India, in terms of their hydrocarbon potential, thermal\\u000a maturity, sequence stratigraphic settings and depositional palaeoenvironment. The samples, collected in Panandhro lignite\\u000a mine, belong to Naredi Formation of Late Paleocene-Early Eocene age. The geochemical results

Vinay K. Sahay

142

Grain shape variations in late pleistocene and holocene fluvial and shelf sands in the northwestern Gulf of Mexico, and the relationship to source and shelf paleogeography  

E-print Network

petrologic province as a "complex of sediments which by their geographical distribution, age and origin form a natural unit. " Provinces in the northwestern Gulf of Mexico, as in other areas have been determined by heavy mineral distri- butions... suite is derived by the Cretaceous, Tertiary, and Quar- ternary sedimentary formations of the Texas coastal plain. The heavy mineral suite is found in nearshore and bay sediments from northern Laguna Madre to Port Aransas and is found mixed...

Withers, Katrina Diane

2012-06-07

143

Composition and age of the crystalline basement in the northwestern part of the west Siberian oil-and-gas megabasin  

NASA Astrophysics Data System (ADS)

Primary data on material composition of epidote-garnet plagiogneisses from the crystalline basement of the Yangiyugan area (the northwestern part of West Siberia) are presented. It is found that plagiogneisses were formed over the substrate of leucocratic plagiogranites (trondhjemites) under the conditions of the amphibolites facies of metamorphism. The SHRIMP II U-Pb-dating of zircons showed that the igneous intrusion of plagiogranites proceeded during the Late Vendian (566 ± 3 Ma). Their metamorphism with the formation of plagiogneisses took place in the Early Ordovician (486 ± 4 Ma). The shows of powerful fluid-metasomatic processes of the transformation of rocks during the Carboniferous time are revealed.

Ivanov, K. S.; Koroteev, V. A.; Erokhin, Yu. V.; Shokalsky, S. P.; Sergeev, S. A.

2014-12-01

144

Geology and timing of mineralization at the Cangshang gold deposit, north-western Jiaodong Peninsula, China  

USGS Publications Warehouse

The Cangshang gold deposit of the northwestern Jiaodong Peninsula contains reserves of greater than 50 tonnes (t) and is developed by the largest open pit gold mine in China. This deposit is a Jiaojia-style (i.e. disseminated-and-veinlet) deposit. It is controlled by the San-Cang fault zone, which trends ???040?? and dips 40-75??SE at the mine site. The main (no. 1) orebody lies between a hanging wall of Precambrian metamorphic rocks (mainly amphibolite) of the Fenzishan Group and a footwall composed of the Mesozoic Linglong granitoid. The ore zone is mainly composed of pyritized, sericitized and silicified granitoid, which has undergone variable degrees of cataclasis. SHRIMP U-Pb dating of zircon indicates that the protolith of the hanging wall amphibolite was formed at 2530 ?? 17 Ma and underwent metamorphism at 1852 ?? 37 Ma. The footwall granodiorite has been dated at 166 ?? 4 Ma, whereas zircons from the ore zone yield a younger age of 154 ?? 5 Ma. Cathodoluminescence images of zircons from the granodiorite and ore zone show oscillatory zonation indicative of an igneous origin for both and the ages of these zircons, therefore, are all interpreted to be representative of magmatic crystallization. Dating of sericite by 40Ar-39Ar has been used to directly determine the timing of formation of the Cangshang deposit, providing the first time absolute age on formation of the Jiaojia-style gold deposits. The well-defined age of 121.3 ?? 0.2 Ma provides the precise timing of gold mineralization at the Cangshang deposit. This age is consistent with those of Linglong-style (vein type) gold mineralization, also from the north-western Jiaodong Peninsula, at between 126 and 120 Ma. Therefore, our work indicates that both styles of gold deposits in the Jiaodong Peninsula were formed during the same mineralization event.

Zhang, X.; Cawood, P.A.; Wilde, S.A.; Liu, R.; Song, H.; Li, W.; Snee, L.W.

2003-01-01

145

The Driskill Graduate Program Northwestern University  

E-print Network

by Burkholderia pseudomallei Jeffery F. Miller, Ph.D. is the M. Philip Davis Chair in Microbiology and Immunology cycles of Bordetella pertussis, which causes whooping cough, and Burkholderia pseudomallei, which causes and Burkholderia, iv) biofilm formation and the hyper-colonization phenotype of Staphylococcus epidermiditis, and v

Engman, David M.

146

Digital data sets that describe aquifer characteristics of the Enid isolated terrace aquifer in northwestern Oklahoma  

USGS Publications Warehouse

ARC/INFO export and nonproprietary format files The data sets in this report include digitized aquifer boundaries and maps of hydraulic conductivity, recharge, and ground-water level elevation contours for the Enid isolated terrace aquifer in northwestern Oklahoma. The Enid isolated terrace aquifer covers approximately 82 square miles and supplies water for irrigation, domestic, municipal, and industrial use for the City of Enid and western Garfield County. The Quaternary-age Enid isolated terrace aquifer is composed of terrace deposits that consist of discontinuous layers of clay, sandy clay, sand, and gravel. The aquifer is unconfined and is bounded by the underlying Permian-age Hennessey Group on the east and the Cedar Hills Sandstone Formation of the Permian-age El Reno Group on the west. The Cedar Hills Sandstone Formation fills a channel beneath the thickest section of the Enid isolated terrace aquifer in the midwestern part of the aquifer. All of the data sets were digitized and created from information and maps in a ground-water modeling thesis and report of the Enid isolated terrace aquifer. The maps digitized were published at a scale of 1:62,500. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. Therefore, values of hydraulic conductivity and recharge used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data.

Becker, C.J.; Runkle, D.L.; Rea, Alan

1997-01-01

147

Sulfide geochemistry and genesis of Chouichia and Ain el Bey copper deposits in northwestern Tunisia  

NASA Astrophysics Data System (ADS)

The Chouichia and Ain el Bey copper veins that occur in the Eastern Atlas fold belt in northwestern Tunisia, are hosted in Upper Cretaceous-Paleogene sedimentary sequences in a regional transcurrent shear zone. Paragenetic assemblages were formed during four distinct stages all of which are separated by fracturing and brecciation: Stage 1 consists of low temperature siderite (160 180 °C) formation in association with pyrite, including framboidal pyrite and marcasite. Stage 2 includes pseudomorphing of marcasite by As-rich pyrite and arsenopyrite, and formation of chalcopyrite at higher temperatures (200 300 °C) from S-rich, Fe-Cu-bearing fluids; As contents in individual pyrite and arsenopyrite crystals increase markedly in the rims relative to the centers, thus indicating non-equilibrium conditions. Stage 3 involves fracturing and brecciation predating deposition of enargite, luzonite and tennantite at Ain el Bey, and famatinite and tetrahedrite at Chouichia, from As-Sb-Bi-bearing ore-forming fluids; tennantite-tetrahedrite series exhibit iron and copper-excess replacements in tetrahedral sites inter-related with Cu-Fe interactions (electron transfer). In Stage 4 fracturing was followed by calcite formation in voids. Comprehensive data was obtained from scanning electron microprobe (SEM) and microprobe chemical analyses of minerals, geothermometry using sulfur isotopes, As contents in arsenopyrite crystals and fluid inclusions in siderite and calcite, support an input of magmatic hydrothermal ore-forming fluids, although contamination by sedimentary sulfur were also identified.

Slim-Shimi, N.; Moëlo, Y.; Tlig, S.; Lévy, C.

1996-03-01

148

Spatial relationships between swift foxes and coyotes in northwestern Texas  

Microsoft Academic Search

Abstract: Interspecific competition,among,canids can result in mortalities and spatial displacement,of smaller canids by larger canids. To investigate mortalities and spatial relationships of swift foxes ( Vulpes velox) and coyotes (Canis latrans), we captured and radio-tracked both species at Rita Blanca National Grasslands in northwestern Texas. At least 89% of swift fox mortalities were caused by coyotes, resulting in a relatively

Jan F. Kamler; Warren B. Ballard; Rickey L. Gilliland; Kevin Mote

2003-01-01

149

Palaeontology and Zooarchaeology of Mezmaiskaya Cave (Northwestern Caucasus, Russia)  

Microsoft Academic Search

Over 6000 large mammal and numerous small vertebrate remains have been recovered from preliminary excavations at Mezmaiskaya Cave, situated at 1300–1350m above sea level in the northwestern foothills of the Caucasus Mountains. Most remains were recovered from layers containing Mousterian artefacts that date to the late Middle Pleniglacial (35,000bpand older). The faunal assemblage reflects a very low degree of weathering,

Robin L. Burgess

1996-01-01

150

Winter Prey Selection of Canada Lynx in Northwestern Montana  

Microsoft Academic Search

ABSTRACT The roles that diet and prey abundance,play in habitat selection of Canada,lynx (Lynx canadensis) in the contiguous,United States is poorly understood. From 1998–2002, we back-tracked radiocollared lynx (6 F, 9 M) for a distance of 582 km and we located 86 kills in northwestern Montana, USA. Lynx preyed on 7 species that included blue grouse (Dendragapus obscurus), spruce grouse

JOHN R. SQUIRES; LEONARD F. RUGGIERO

2007-01-01

151

Dynamics, Patterns and Causes of Fires in Northwestern Amazonia  

PubMed Central

According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

Armenteras, Dolors; Retana, Javier

2012-01-01

152

Geological mapping in northwestern Saudi Arabia using LANDSAT multispectral techniques  

NASA Technical Reports Server (NTRS)

Various computer enhancement and data extraction systems using LANDSAT data were assessed and used to complement a continuing geologic mapping program. Interactive digital classification techniques using both the parallel-piped and maximum-likelihood statistical approaches achieve very limited success in areas of highly dissected terrain. Computer enhanced imagery developed by color compositing stretched MSS ratio data was constructed for a test site in northwestern Saudi Arabia. Initial results indicate that several igneous and sedimentary rock types can be discriminated.

Blodget, H. W.; Brown, G. F.; Moik, J. G.

1975-01-01

153

41. SOUTHEAST ACROSS WOODWORKING SHOP AREA IN NORTHWESTERN QUADRANT OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

41. SOUTHEAST ACROSS WOODWORKING SHOP AREA IN NORTHWESTERN QUADRANT OF FACTORY SHOWING ON LEFT CIRCA 1900 CROSS-CUTOFF CIRCULAR SAW AND ON RIGHT CIRCA 1900 TABLE SAW. BEHIND THE CROSS-CUTOFF SAW IS A CIRCA 1900 SNAG GRINDER. IN THE CENTER BACKGROUND IS THE CIRCA 1900 MICHIGAN MACHINERY MFG. CO. PUNCH PRESS. - Kregel Windmill Company Factory, 1416 Central Avenue, Nebraska City, Otoe County, NE

154

Habitat and host associations of Craterellus tubaeformis in northwestern Oregon.  

PubMed

Knowledge of the habitat and host associations of Craterellus tubaeformis (winter chanterelle) is the key to understanding the ecological characteristics needed for its conservation. In this study, a survey of forest types in northwestern Oregon for mycorrhizal associates is performed and the hypotheses that stand age and the volume of well-decayed, coarse, woody debris (CWD) are significant to the standing crop biomass and the probability of C. tubaeformis occurrence are tested. Host associations were identified with polymerase chain reaction (PCR) amplification and restriction fragment-length polymorphism (RFLP) typing. Habitat associations were tested by measurements on 64 plots in the Coast and Cascade Ranges of northwestern Oregon. Data analysis found that stand age and well-decayed, coarse, woody debris were related significantly to the probability of C. tubaeformis occurrence but not to standing crop biomass. Results indicated the volume of well-decayed CWD is particularly important to the probability of C. tubaeformis occurrence in stands less than 100 yr of age. Well-decayed CWD was the substratum for 88% of C. tubaeformis sporocarps across all stands, despite the fact that ground area coverage of CWD ranged only from 3 to 26%. Slope, elevation and aspect were not related to the probability of C. tubaeformis occurrence or standing crop biomass. The occurrence of C. tubaeformis in northwestern Oregon is highly correlated to the presence of western hemlock (Tsuga heterophylla), and their mycorrhizal association was confirmed. Craterellus tubaeformis also can form mycorrhizae with Douglasfir (Pseudotsuga menziesii) and Sitka spruce (Picea sitchensis) but is encountered only rarely in stands without a hemlock component. In northwestern Oregon, the presence of Hydnum spp. in a stand is a good indicator of the presence of C. tubaeformis. Differences in genetic sequences between C. tubaeformis populations in western North America, eastern North America and Europe suggest the likelihood of several distinct species. PMID:21148873

Trappe, M J

2004-01-01

155

The Heroic Age: A Journal of Early Medieval Northwestern Europe  

NSDL National Science Digital Library

Published since 1998, this free, peer-reviewed online journal is "dedicated to the study of Northwestern Europe from the Late Roman Empire to the advent of the Norman Empire." To date, four issues have been published, all of which are available online. In addition to articles, each issue contains a forum, Website and book reviews, and a digest of recent archaeological news. The main site also offers a collection of related links.

156

Northwestern University Feinberg School of Medicine IMMUNIZATION FORM  

E-print Network

. For page 4: A PPD skin test or chest x-ray or QuantiFERON ­GOLD blood test done in the United States within) STUDENTS ONLY: 10. If you are an international student, and have proof of a PPD skin test or chest x-rayFERON-GOLD blood test or chest x-ray at Northwestern. 12. TB test results performed in any country other than

Chisholm, Rex L.

157

Factors affecting waterfowl use of constructed wetlands in northwestern Minnesota  

Microsoft Academic Search

Waterfowl pair and brood use of constructed wetlands was evaluated during 1980–81 on 4 Wildlife Management Areas in northwestern\\u000a Minnesota. Weekly ground counts of waterfowl were made at each of 109 wetlands during the April to mid-July nesting season\\u000a and correlated with physical, vegetative, and limnological characteristics. The number of pairs of the 10 most common waterfowl\\u000a species using the

Douglas A. Leschisin; Gary L. Williams; Milton W. Weller

1992-01-01

158

Trade in Palm Products in North-Western South America  

Microsoft Academic Search

More than 200 scientific publications and Internet sources dealing with trade in palm products in north-western South America\\u000a are reviewed. We focus on value chains, trade volumes, prices, and recent developments for some of the most important raw\\u000a materials derived from native palms. Trade in palm products takes place at local, regional, national, and international levels.\\u000a For local communities and

Grischa Brokamp; Natalia Valderrama; Moritz Mittelbach; Anders S. Barfod; Maximilian Weigend

159

Northwestern University Facility for Clean Catalytic Process Research  

SciTech Connect

Northwestern University with DOE support created a Facility for Clean Catalytic Process Research. This facility is designed to further strengthen our already strong catalysis research capabilities and thus to address these National challenges. Thus, state-of-the art instrumentation and experimentation facility was commissioned to add far greater breadth, depth, and throughput to our ability to invent, test, and understand catalysts and catalytic processes, hence to improve them via knowledge-based design and evaluation approaches.

Marks, Tobin Jay [Northwestern University

2013-05-08

160

Dynamics, patterns and causes of fires in Northwestern Amazonia.  

PubMed

According to recent studies, two widespread droughts occurred in the Amazon basin, one during 2005 and one during 2010. The drought increased the prevalence of climate-driven fires over most of the basin. Given the importance of human-atmosphere-vegetation interactions in tropical rainforests, these events have generated concerns over the vulnerability of this area to climate change. This paper focuses on one of the wettest areas of the basin, Northwestern Amazonia, where the interactions between the climate and fires are much weaker and where little is known about the anthropogenic drivers of fires. We have assessed the response of fires to climate over a ten-year period, and analysed the socio-economic and demographic determinants of fire occurrence. The patterns of fires and climate and their linkages in Northwestern Amazonia differ from the enhanced fire response to climate variation observed in the rest of Amazonia. The highest number of recorded fires in Northwestern Amazonia occurred in 2004 and 2007, and this did not coincide with the periods of extreme drought experienced in Amazonia in 2005 and 2010. Rather, during those years, Northwestern Amazonia experienced a relatively small numbers of fire hotspots. We have shown that fire occurrence correlated well with deforestation and was determined by anthropogenic drivers, mainly small-scale agriculture, cattle ranching (i.e., pastures) and active agricultural frontiers (including illegal crops). Thus, the particular climatic conditions for air convergence and rainfall created by proximity to the Andes, coupled with the presence of one of the most active colonisation fronts in the region, make this region differently affected by the general drought-induced fire patterns experienced by the rest of the Amazon. Moreover, the results suggest that, even in this wet region, humans are able to modify the frequency of fires and impact these historically well preserved forests. PMID:22523580

Armenteras, Dolors; Retana, Javier

2012-01-01

161

A southwest monsoon hydrographic climatology for the Northwestern Arabian Sea  

NASA Technical Reports Server (NTRS)

This paper provides a detailed hydrographic climatology for the shallow northwestern Arabian Sea prior to and during the southwest monsoon, presented as multiple-year composite vertical hydrographic sections based on National Oceanographic Data Center historical ocean station data. Temperature and salinity measurements are used to infer the water masses present in the upper 500 m. The hydrographic evolution depicted on bimonthly sections is inferred to result from wind-driven physical processes. In the northwestern Arabian Sea the water mass in the upper 50 m is the Arabian Sea Surface Water. Waters from 50 to 500 m are formed by mixing of Arabian Sea Surface Water with Antarctic and Indonesian intermediate waters. The inflow of Persian Gulf Water does not significantly influence the hydrography of the northwestern Arabian Sea along the Omani coast. Nitrate has a high inverse correlation with temperature and oxygen in the premonsoon thermocline in the depth interval 50-150 m. During the southwest monsoon, coastal upwelling off Oman and adjacent offshore upward Ekman pumping alter the shallow hydrography.

Brock, John C.; Mcclain, Charles R.; Hay, W. W.

1992-01-01

162

Food habits of pumas in northwestern Sonora, Mexico  

USGS Publications Warehouse

It is questionable whether food-habits studies of pumas conducted in the southwestern United States can be extrapolated to northwestern Mexico, because of differences in management, distribution, and abundance of wildlife. We determined food habits of pumas (Puma concolor) in the Sonoran Desert of northwestern Sonora, Mexico. Based on studies in the western United States, we hypothesized that desert mule deer (Odocoileus hemionus) were the major food source of pumas in Sonoran Desert habitats of Mexico. The study area supports populations of desert mule deer, white-tailed deer (Odocoileus virginianus), lagomorphs (Lepus spp. and Sylvilagus audubonii), collared peccary (Pecari tajacu), and the largest population (???300 individuals) of desert bighorn sheep (Ovis canadensis) in Sonora. Based on pugmark characteristics, we recorded 3 different adult resident pumas in approximately 90 km2. We analyzed 60 puma fecal samples collected September 1996-November 1998. Primary prey items based on frequency of occurrence and estimated biomass consumed were desert bighorn sheep (40% and 45%, respectively), lagomorphs (33%, 19%), deer (17%, 17%), and collared peccary (15%, 11%). The high percentage of desert bighorn sheep in puma diets may be due to high abundance relative to mule deer, which declined in number during our study. No differences were found in puma diets between seasons (??22=2.4526, P=0.2934). Fluctuations in mule deer populations in northwestern Sonora may influence prey selection by pumas.

Rosas-Rosas, O. C.; Valdez, R.; Bender, L.C.; Daniel, D.

2003-01-01

163

76 FR 77214 - Hawaii Crustacean Fisheries; 2012 Northwestern Hawaiian Islands Lobster Harvest Guideline  

Federal Register 2010, 2011, 2012, 2013, 2014

...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration RIN 0648-XA838 Hawaii Crustacean Fisheries; 2012 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

2011-12-12

164

Qualitative Modeling and Similarity in Back of the Envelope Reasoning Praveen K. Paritosh (paritosh@cs.northwestern.edu)  

E-print Network

(paritosh@cs.northwestern.edu) Kenneth D. Forbus (forbus@northwestern.edu) Qualitative Reasoning Group like environmental science [Harte, 1988] and biophysics [O'Connor and Spotila, 1992] are so complex

Forbus, Kenneth D.

165

Geology and geochemistry of the clastic sequences from Northwestern Panay (Philippines): Implications for provenance and geotectonic setting  

NASA Astrophysics Data System (ADS)

Whole-rock geochemical analysis of samples from the clastic sequences in Northwestern Panay revealed different compositional ranges for the Buruanga Peninsula and Antique Range. The results provide additional evidence that Northwestern Panay consists of two distinct terranes as a result of the arc-continent collision between the Palawan Microcontinental Block and the Philippine Mobile Belt. Major element compositions of clastic rocks from the Buruanga Peninsula (Saboncogon Formation) revealed that they belong to a continental margin tectonic setting whereas the Antique Range sedimentary rocks (Lagdo Formation) show an affinity to an oceanic island arc setting. The Fragante Formation of the Antique Range shows some similarities in tectonic setting and provenance with Buruanga Peninsula clastic rocks, which suggests a Buruanga Peninsula sediment contribution during its time of formation. Furthermore, provenance analyses from combined major and trace element data indicate a more silicic source for the Buruanga Peninsula clastics and a more mafic derivation for the sedimentary rocks of the Antique Range. These findings are consistent with previous studies suggesting that the Buruanga Peninsula forms part of the Palawan Microcontinental Block and the Antique Range belongs to the Philippine Mobile Belt. The Palawan Microcontinental Block is believed to be a drifted continental fragment from the Mesozoic East Asian accretionary complex in the southern part of the Eurasian mainland, which represents the continental margin setting and felsic source of the Buruanga Peninsula clastic rocks. Meanwhile, the oceanic island setting and mafic source of the Antique Range clastic rocks represent the volcanic rocks of the Philippine Mobile Belt that were formed as a result of the subduction of the leading oceanic edge of the Palawan Microcontinental Block.

Gabo, Jillian Aira S.; Dimalanta, Carla B.; Asio, Mary Grace S.; Queaño, Karlo L.; Yumul, Graciano P., Jr.; Imai, Akira

2009-12-01

166

Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern University. Argonne is a partner in the Center for Emergent Superconductivity led by Brookhaven National Laboratory.  

E-print Network

Argonne is a partner in the Argonne-Northwestern Solar Energy Research Center led by Northwestern) Argonne Tandem Linac Accelerator System G. Savard (PHY) G. Dely P. Domagala J.S. Gregar D. Gudgel M Conductivity (CES) W. Kwok (MSD) Argonne-Northwestern Solar Energy Research (ANSER) M. Pellin (MSD) #12;

Kemner, Ken

167

Contemporary radioecological state of the North-western Black Sea and the problems of environment conservation.  

PubMed

Review is devoted to the analysis of a radioecological situation in the North-western Black Sea and concerns the levels of contamination of the components of an ecosystem by the main artificial radioactive isotopes ((90)Sr, (137)Cs, (239,240)Pu). The long-term accumulation trends of these radionuclides were analyzed in components of the Black Sea ecosystem after the Chernobyl nuclear power plant accident. Zones that have an increased ability to accumulate these radioisotopes were revealed. The assessment of irradiation dose rates formed by (90)Sr, (137)Cs and (239,240)Pu in Black Sea hydrobionts was obtained. The strategy for biodiversity conservation and sustainable management of natural resources should include monitoring of the radioecological state of the marine ecosystems, and the formation of a complex of biogeochemical criteria for assessment of an ecological situation in the sea. This approach is important for marine protected areas, since it allows the formation of a basis for scientific and practical function. PMID:24461697

Tereshchenko, N N; Mirzoyeva, N Yu; Gulin, S B; Milchakova, N A

2014-04-15

168

Regional correlation of deposition sequences in the southern Mesozoic marine province, northwestern Nevada  

SciTech Connect

Strata of the Mesozoic marine province of a northwestern Nevada, deposited in subaerial to deep marine environment in a backarc basin, underwent severe deformation during the late Mesozoic. Restoration of stratigraphic relations among constituent volcanic, volcanogenic, carbonate, and continentally-derived siliciclastic rocks has been hampered by sparse biostratigraphic age control. Regional correlation of coeval facies is made possible by coupling depositional sequences with biostratigraphic control in the southwestern Gabbs Valley Range, the southern Shoshone Mountains, and the southern Clan Alpine Mountains, which serve as reference sections for Late Triassic and Early Jurassic ammonite zonation of western North America. Differentiation between regionally significant sequence boundaries and those of limited areal extent is possible only by linking the biostratigraphy and physical stratigraphic relations, such as abrupt vertical transitions in lithology corresponding to large facies changes. Physical stratigraphic relations alone are not adequate for correlation ad indicated by the diachronous initiation of Early to Middle( ) Jurassic deposition in half-graben basins (Dunlap Formation) which locally cloaks eustatically( ) controlled depositional sequences. Within these limitations, three regionally extensive sequences are recognized in the reference sections and have lower boundaries at the base of Upper Triassic shallow marine to deltaic carbonate-clastic rocks (Luning Formation) and at the base and within subtidal to offshore-marine carbonate and clastic rocks (Triassic and Jurassic Volcano Peak Group).

Satterfield, J.I.; Oldow, J.S. (Rice Univ., Houston, TX (United States). Dept. of Geology and Geophysics)

1993-04-01

169

Predation on Released Spiny Lobster, Panulirus marginatus, During Tests in the Northwestern Hawaiian Islands  

E-print Network

Predation on Released Spiny Lobster, Panulirus marginatus, During Tests in the Northwestern Fisheries Center's ABSTRACT-In the Northwestern Hawaiian Islands fishery for spiny lobster, Panulirus marginatus, undersized and ber- ried lobsters must be released. Such lobsters released in the conventional

170

Tidal currents in the northwestern Adriatic: High-frequency radio observations and  

E-print Network

] for a review). The semidiur- nal tide consists of two oppositely traveling Kelvin waves, one incoming fromTidal currents in the northwestern Adriatic: High-frequency radio observations and numerical model] A 2-year deployment of high-frequency radio current meters along the Italian coast of the northwestern

171

The Center for Talent Development at Northwestern University: An Example of Replication and Reformation  

ERIC Educational Resources Information Center

This article describes implementation of the talent search model developed by Julian Stanley at the Center for Talent Development of Northwestern University. While remaining true to the basic components of the talent search, the talent center at Northwestern has emphasized using talent search as a means to influence programming in local schools…

Olszewski-Kubilius, Paula

2005-01-01

172

Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta  

E-print Network

Effects of partial cutting on the ectomycorrhizae of Picea glauca forests in northwestern Alberta) on ectomycorrhizae (ECM) associated with white spruce (Picea glauca (Moench) Voss) in northwestern Alberta, Canada'épinette blanche (Picea glauca (Moench) Voss) dans le nord-ouest de l'Alberta, au Canada. Les traitements

Macdonald, Ellen

173

EVIDENCE AGAINST THE ALLOCHTHONOUS NATURE OF THE STANBRIDGE NAPPE AT HIGHGATE GORGE, NORTHWESTERN VERMONT  

E-print Network

, NORTHWESTERN VERMONT Adam Schoonmaker, Department of Geosciences, Utica College, Utica, NY 13502 William S, at Highgate Center, northwestern Vermont. Here, a continuously exposed, conformable sequence of sandy of Vermont). We shall examine the relationship of these rocks in the gorge and at selected stops to the north

Kidd, William S. F.

174

Northwestern University Archives Evanston, Illinois Ernest Samuels (1903-1996) Papers, 1918-1995  

E-print Network

wrote a thesis on Henry David Thoreau's literary reputation, he received a Master of Arts in English literature, and accordingly, his dissertation topic was, "The Early Career of Henry Adams." Samuels received at Northwestern Samuels continued his research on the career of Henry #12;Northwestern University Archives

175

SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN MEXICO  

E-print Network

SEASONAL AND SPATIAL CHANGES IN FLEA COMMUNITIES OF BLACK-TAILED PRAIRIE DOGS OF NORTHWESTERN were collected from prairie dogs trapped in 7 plots (160 x 160 m) in 3 colonies of northwestern Mexico seasons Fig. 1. Prairie dog colony complex in Chihuahua, Mexico, as mapped in 2005. Focal colonies

Nacional Autónoma de México, Universidad

176

IMPACTS OF A HIGHWAY EXPANSION PROJECT ON WOLVES IN NORTHWESTERN WISCONSIN  

E-print Network

IMPACTS OF A HIGHWAY EXPANSION PROJECT ON WOLVES IN NORTHWESTERN WISCONSIN (Preliminary Findings the impacts of upgrading 71 km of US Highway 53 (US 53) from 2-lanes into 4-lanes on wolves (Canis lupus) in northwestern Wisconsin. Our main objectives were to assess the impacts of the highway project on resident

Gehring, Thomas M.

177

Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern China  

E-print Network

Evidence of uranium biomineralization in sandstone-hosted roll-front uranium deposits, northwestern Available online 25 January 2005 Abstract We show evidence that the primary uranium minerals, uraninite-front uranium deposits, Xinjiang, northwestern China were biogenically precipitated and psuedomorphically

Fayek, Mostafa

178

Thinning Pine Plantations to Reestablish Oak Openings Species in Northwestern Ohio  

E-print Network

Thinning Pine Plantations to Reestablish Oak Openings Species in Northwestern Ohio Scott R. Abella and the reestablishment of oak savanna and prairie species after thinning 14 plantations of Pinus res- inosa and strobus in northwestern Ohio, USA. Thinning reduced tree basal area by an average of 75%. Plant communities were sampled

Abella, Scott R.

179

Mantle source provinces beneath the Northwestern USA delimited by helium isotopes in young basalts  

E-print Network

Mantle source provinces beneath the Northwestern USA delimited by helium isotopes in young basalts results for basalts from the northwestern United States. The new 3 He/ 4 He results for olivine phenocrysts in basalts from the eastern Snake River Plain (SRP), the Owyhee Plateau (OP) and the Oregon High

Graham, David W.

180

Revision of the Upper Cretaceous rudists from northwestern Peru  

NASA Astrophysics Data System (ADS)

Revision of the Upper Cretaceous rudists of northwestern Peru has led to new discoveries and enabled the specification of their taxonomy and stratigraphic locations. Different species have been identified: Biradiolites cf. jamaicensis Trechmann 1924, Radiolites cf. macroplicatus Whitfield 1897, Praebarrettia sparcilirata (Whitfield, 1897) of Late Campanian age, and Macgillavryia nicholasi (Whitfield, 1897) of Middle-Late Maastrichtian age. During the Campanian and Maastrichtian, rudists of Peru show paleobiogeographic affinities with those of the Mexican and Caribbean domains. A paleogeographic route for rudist migrations may have existed at that time along the Caribbean arc and the Curaçao-Ecuador coastline.

Philip, Jean; Jaillard, Etienne

2004-09-01

181

Sampling of copper-bearing Keweenawan rocks of northwestern Wisconsin  

USGS Publications Warehouse

Metallic copper or copper minerals are locally present, in flows, conglomerate, siltstone, and shale of Keweenawan age that underlie about 3,000 square miles of northwestern Wisconsin. Representative samples taken from 24 of the reported occurrences in lava or conglomerate contain 0.0075 to 0.69 percent copper; 10 of them have more than 0.10 percent. No study was made to appraise the geologic Settings of the sampled sites as guides to possibly more significantly mineralized rock. The siltstone and shale sequence is sparingly exposed in Wisconsin but was not sampled; exploratory drilling has shown that it is mineralized locally.

Dutton, Carl E.

1972-01-01

182

Stratigraphic Analysis of Upper Cretaceous Rocks in the Mahajanga Basin, Northwestern Madagascar: Implications for Ancient and Modern Faunas.  

PubMed

Upper Cretaceous strata of the Mahajanga Basin, northwestern Madagascar, yield some of the most significant and exquisitely preserved vertebrate fossils known from Gondwana. The sedimentology of these strata and their stratigraphic relations have been the focus of renewed geological investigations during the course of five expeditions since 1993. We here designate stratotypes and formalize the terrestrial Maevarano Formation, with three new members (Masorobe, Anembalemba, Miadana), and the overlying marine Berivotra Formation. The Maevarano Formation accumulated on a broad, semiarid alluvial plain bounded to the southeast by crystalline highlands and to the northwest by the Mozambique Channel. The Berivotra Formation was deposited in an open marine setting that evolved from a clastic- to a carbonate-dominated shelf, resulting in deposition of the overlying Betsiboka limestone of Danian age. New stratigraphic data clearly indicate that the Maevarano Formation correlates, at least in part, with the Maastrichtian Berivotra Formation, and this in turn indicates that the most fossiliferous portions of the Maevarano Formation are Maastrichtian in age, rather than Campanian as previously reported. This revised age for the Maevarano vertebrate assemblage indicates that it is approximately contemporaneous with the vertebrate fauna recovered from the Deccan basalt volcano-sedimentary sequence of India. The comparable age of these two faunas is significant because the faunas appear to be more similar to one another than either is to those from any other major Gondwanan landmass. The revised age of the Maevarano Formation, when considered in the light of our recent fossil discoveries, further indicates that the ancestral stocks of Madagascar's overwhelmingly endemic modern vertebrate fauna arrived on the island in post-Mesozoic times. The basal stocks of the modern vertebrate fauna are conspicuously absent in the Maevarano Formation. Finally, the revised age of the Maevarano Formation serves to expand our global perspective on the K/T event by clarifying the age of a diverse, and arguably the best preserved, sample of Gondwanan vertebrates from the terminal Cretaceous. PMID:10769157

Rogers; Hartman; Krause

2000-05-01

183

Seismicity of Northwestern Italy during the last 30 years  

NASA Astrophysics Data System (ADS)

The aim of this work is to describe the seismicity of Northwestern Italy from the very detailed picture provided by 30 years of accurate instrumental recordings coming from the Regional Seismic Network of Northwestern Italy (RSNI—University of Genoa). In an attempt to provide, for the first time, a comprehensive view of the seismicity in the area, this study describes the main characteristics of the database collected by the RSNI network. The seismicity is spread almost over the entire area, but it is mainly concentrated in the Northern Apennines and in the western sector of the Alps. The seismicity of the area is superficial: It is almost confined to the first 20 km of depth. Only a few deeper events are located in a small area southwest of the city of Turin, down to a depth of 80 km, and below the Northern Apennines down to 60-70-km depth. The majority of the earthquakes in this sector of the Italian peninsula are of low magnitude; nevertheless, the areas where the highest magnitude earthquakes took place during the last three decades are the Northern Apennines and the lower Piedmont, on land, and the Ligurian Sea, offshore. They are indeed the areas where the most damaging historical earthquakes have occurred, giving emphasis, if necessary, to the importance of continuous seismic monitoring.

Scafidi, D.; Barani, S.; De Ferrari, R.; Ferretti, G.; Pasta, M.; Pavan, M.; Spallarossa, D.; Turino, C.

2015-01-01

184

Geogenic sources of local arsenic enrichment in groundwater from northwestern Thuringia, Germany  

NASA Astrophysics Data System (ADS)

Aqueous fluids migrating in the Earth's crust interact with the host rocks and partially take up their geochemical signatures. Mineralization and sometimes geogenic contamination of the groundwater may be the consequence: The aquifer systems of the Lower Triassic Buntsandstein Formation, an important source of drinking water in north-western Thuringia, and the Rotliegend Formation are locally affected by elevated arsenic concentrations. Data from water wells locally show arsenic concentrations above the limit value for drinking water (10 ?g/L). The regional distribution as well as lack of secondary vein mineralizations or anthropogenic sources within this area point to a geogenic stratibound source of arsenic. The average concentration of the toxic, carcinogenic trace element arsenic in rocks of Phanerozoic rocks in Germany range from 5 to 12 ?g/g for different lithologies, being generally higher in Variscan rocks. However, it can be several times enriched in certain sedimentary lithologies such as pelites and even more so in coal beds. In our present study we investigate all sequences of the Buntsandstein and Rotliegend Formation with their different lithologies in order to identify the relevant carriers of arsenic. Geochemical analyses on samples from selected drill cores and outcrops show arsenic of >50 ?g/g especially in carbonaceous sediment sections as well as in primarily gray-green lacustrine clay stones. Elevated arsenic concentrations seem to be related to lithofacies of lacustrine origin in the Buntsandstein and carbonaceous sediment sections in the Rotliegend. Aim of the current study is now to identify the appropriate synsedimentary mineral phases that incorporate arsenic and to identify the processes and conditions under which arsenic is mobilized from these phases and transferred into the groundwater.

Abratis, Michael; Viereck, Lothar

2014-05-01

185

The Mont Terri rock laboratory, a new international research project in a Mesozoic shale formation, in Switzerland  

Microsoft Academic Search

In many countries, argillaceous formations are being considered as potential host rocks for repositories of radioactive waste. Therefore, in 1995 several organisations decided to start an international research project in the reconnaissance gallery of the Mont Terri motorway tunnel, in north-western Switzerland, in a Mesozoic shale formation, the Opalinus Clay (Aalenian).This project is under the patronage of the Swiss National

M. Thury; P. Bossart

1999-01-01

186

Thermal maturity and source-rock potential in Northwestern Melville Island, Arctic Canada  

SciTech Connect

This paper reports that approximately 130 core and drillhole cuttings samples taken from the Palaeozoic and Mesozoic of northwestern Melville Island were examined using reflected-light microscopy and Rock-Eval pyrolysis. The Palaeozoic section is dominated by bitumen, and often numerous bitumen populations are identified based on morphology, texture, and optical properties. Bitumen reflectance increases with depth, following a trend almost parallel to vitrinite, an indication that it is primary and has been subjected to similar thermal stress. The upper Palaeozoic sediments are within the hydrocarbon generation zone but have limited potential, except for an algal-rich interval in the Permian Trold Fiord Formation. Overall, the study is important because it attempts to identify the source rocks in an area of Melville Island where no previous work has been reported on the hydrocarbon-generating potential of the sedimentary succession. In addition, the use of bitumen reflectance in lower Palaeozoic strata devoid of vitrinite is evaluated and the amount of eroded section is calculated based on the thermal maturity pattern of bitumen.

Gentzis, T. (Alberta Research Council, Coal Research Center Devon, One Oil Patch Drive, Devon, Alberta T0C 1E0 (CA)); Goodarzi, F. (Geological Survey of Canada, Calgary, AB (Canada))

1992-10-01

187

New Circulation Features in the Northwestern Tropical Pacific Ocean from Profiling Float Measurements  

NASA Astrophysics Data System (ADS)

Ten SOLO-II profiling floats have were deployed in the northwestern tropical Pacific Ocean in August 2011 as part of the ONR's Origin of the Kuroshio and Mindanao Currents (OKMC) project. These floats have a 5-day repeat cycle and measure T/S profiles at a vertical resolution of 2-dbars. By combining the OKMC and Argo data, we observed two well-defined branches of the eastward-flowing subtropical countercurrent (STCC). These two branches, located respectively along 19.0N and 21.5N, are embedded within the westward-flowing North Equatorial Current (NEC) between 7N and 25N and above the 26.5 isopycnal surface. Below the unventilated 26.5 isopycnal layer, the circulation is dominated by three, eastward-flowing, zonal jets. Dubbed the North Equatorial Undercurrent Jets (NEUJ), these three subthermocline jets are quasi-stationary and persist approximately along 10N, 13N and 18N, respectively. In the presentation, we will discuss in detail the mean structure and formation mechanism of these newly-observed NEUJs.

Qiu, B.; Rudnick, D. L.; Chen, S.

2012-12-01

188

Fluvial response to late Quaternary climatic fluctuations, central Kobuk Valley, northwestern Alaska  

SciTech Connect

Much of northwestern Alaska remained unglaciated during the Pleistocene and thus offers a favorable setting for examining long-term records of high-latitude geological and biological change. Epiguruk, a large cut bank 3.5 km long and up to 36 m high on the Kobuk River south of the Brooks Range in eastern Beringia, exposes complex sedimentary successions representing cycles of upper quaternary alluviation and eolian sedimentation, downcutting, and soil formation. A rich record of plants and mammals is also preserved in the section. Deposits of fluvial channels and flood plains, eolian dunes, sand sheets, loess, and ponds, as well as organic soils (Histosols) are represented. Parallel-bedded fine sand and coarse silt couplets that commonly contain root structures, ripple cross-lamination, silt drapes are flood-plain sediments apparently deposited at the interface of fluvial and eolian environments. Multiple fluvial-to-eolian depositional sequences were caused by influx of eolian sediment to the river from intermittently active dune fields south of the Kobuk River. Alluviation in the Kobuk Valley was coeval with glaciation in the Brooks Range, whereas downcutting occurred during interstadials when dune stabilization limited sediment supply. The depositional model developed at Epiguruk may be useful in interpreting some of the widespread subhorizontally stratified late-glacial deposits of Europe and North America.

Ashley, G.M. (Rutgers Univ., New Brunswick, NJ (United States). Dept. of Geological Sciences); Hamilton, T.D. (U.S. Geological Survey, Anchorage, AK (United States))

1993-09-01

189

Study of thunderstorm activity connection with weather system structures over the North-Western Pacific Ocean  

NASA Astrophysics Data System (ADS)

Applying the data of VLF direction finder receiving station of IKIR FEB RAS, included into the World Wide Lightning Location Network (WWLLN), the paper investigates the relations of field characteristics of recorded lightning discharges in the north-western part of the Pacific ocean with field characteristics of weather formation meteorological elements, evaluated according to the data of Earth remote sounding from satellites. On the example of separate tropical cyclones (TC) for 2012-2013, the relation of lightning discharge frequency and density with spatial distribution of driving wind whirl is shown. TC structure evolution is traced in cloudiness fields, driving wind whirl, and lightning discharge distribution. This publication is based on work supported by a grant from the U.S. Civilian Research and Development Foundation (RUG1-7084-PA-13) with funding from the United States Department of State. The opinions, findings and conclusions stated herein are those of the authors and do not necessarily reflect those of CRDF Global or the United States Department of State.

Permyakov, M. S.; Cherneva, N. V.; Shevtsov, B. M.; Potalova, E. Yu.; Holzworth, Robert

2014-11-01

190

Previously Unrecognized Ornithuromorph Bird Diversity in the Early Cretaceous Changma Basin, Gansu Province, Northwestern China  

PubMed Central

Here we report on three new species of ornithuromorph birds from the Lower Cretaceous Xiagou Formation in the Changma Basin of Gansu Province, northwestern China: Yumenornis huangi gen. et sp. nov., Changmaornis houi gen. et sp. nov., and Jiuquanornis niui gen. et sp. nov.. The last of these is based on a previously published but unnamed specimen: GSGM-05-CM-021. Although incomplete, the specimens can be clearly distinguished from each other and from Gansus yumenensis Hou and Liu, 1984. Phylogenetic analysis resolves the three new taxa as basal ornithuromorphs. This study reveals previously unrecognized ornithuromorph diversity in the Changma avifauna, which is largely dominated by Gansus but with at least three other ornithuromorphs. Body mass estimates demonstrate that enantiornithines were much smaller than ornithuromorphs in the Changma avifauna. In addition, Changma enantiornithines preserve long and recurved pedal unguals, suggesting an arboreal lifestyle; in contrast, Changma ornithuromorphs tend to show terrestrial or even aquatic adaptions. Similar differences in body mass and ecology are also observed in the Jehol avifauna in northeastern China, suggesting niche partitioning between these two clades developed early in their evolutionary history. PMID:24147058

Wang, Ya-Ming; O'Connor, Jingmai K.; Li, Da-Qing; You, Hai-Lu

2013-01-01

191

Structure and chemistry in the northwestern condensation of the Serpens molecular cloud core  

NASA Technical Reports Server (NTRS)

We present single-dish and interferometric observations of gas and dust in the core of the Serpens molecular cloud, focusing on the northwestern condensation. Single-dish molecular line observations are used to probe the structure and chemistry of the condensation while high-resolution images of CS and CH30H are combined with continuum observations from lambda = 1.3 mm to lambda = 3.5 cm to study the subcondensations and overall distribution of dust. For the northwestern condensation, we derive a characteristic density of 3 x 10(exp 5)/ cu cm and an estimated total mass of approximately 70 solar mass. We find compact molecular emission associated with the far-infrared source S68 FIRS 1, and with a newly detected subcondensation named S68 N. Comparison of the large-and small-scale emission reveals that most of the material in the northwest condensation is not directly associated with these compact sources, suggesting a youthful age for this region. CO J = 1 approaches 0 observations indicate widespread outflow activity. However, no unique association of embedded objects with outflows is possible with our observations. The SiO emission is found to be extended with the overall emission centered about S68 FIRS 1; the offset of the peak emission from all of the known continuum sources and the coincidence between the blueshifted SiO emission and blueshifted high-velocity gas traced by CO and CS is consistent with formation of SiO in shocks. Derived abundances of CO and HCO(+) are consistent with quiescent and other star-forming regions while CS, HCN, and H2CO abundances indicate mild depletions within the condensation. Spectral energy distribution fits to S68 FIRS 1 indicate a modest luminosity (50-60 solar luminosity), implying that it is a low-mass (0.5-3 solar mass) young stellar object. Radio continuum observations of the triple source toward S68 FIRS 1 indicate that the lobe emission is varying on timescales less than or equal to 1 yr while the central component is relatively constant over approximately 14 yr. The nature of a newly detected compact emission region, S68 N, is less certain due to the absence of firm continuum detections; based on its low luminosity (less than 5 solar luminosity) and strong molecular emission, S68 N may be prestellar subcondensation of gas and dust.

Mcmullin, Joseph P.; Mundy, Lee G.; Wilking, Bruce A.; Hezel, T.; Blake, Geoff A.

1994-01-01

192

Integrated chemostratigraphy and biostratigraphy of the Windermere Supergroup, northwestern Canada: implications for Neoproterozoic correlations and the early evolution of animals.  

PubMed

The thick, richly fossiliferous succession of the upper Windermere Supergroup, Mackenzie Mountains, northwestern Canada, provides a test of integrated biostratigraphic and chemostratigraphic frameworks in terminal Proterozoic correlation. The C- and Sr-isotopic abundances of lower Keele Formation carbonates approximate those for other pre-Varanger samples, confirming that the simple disc-like fossils of the underlying Twitya Formation predate all known diverse Ediacaran faunas. "Tepee" and Sheepbed carbonates record strong post-glacial isotopic excursions; in contrast, delta13C values for Gametrail through Risky carbonates vary only within the narrow range of about +l% to +2%. A second negative excursion occurs in Ingta Formation carbonates that immediately underlie the paleontologically determined Precambrian-Cambrian boundary. The upper Windermere profile as a whole compares closely with curves determined for other terminal Proterozoic successions. The lowermost diverse Ediacaran assemblages in the Sheepbed Formation correlate chemostratigraphically with the oldest fauna in Namibia, but the two assemblages differ in taxonomic composition. Blueflower assemblages correlate both chemostratigraphically and taxonomically with faunas from Australia, China, Siberia, and elsewhere. Increasing data support the hypothesis that paleontological and geochemical data together provide a reliable means of correlating terminal Proterozoic sedimentary rocks throughout the world. PMID:11539403

Narbonne, G M; Kaufman, A J; Knoll, A H

1994-10-01

193

Floods of January 15-17, 1974, in Northwestern Montana  

USGS Publications Warehouse

Introduction Rain and snowmelt caused several streams in northwestern Montana to flood during January 15-17, 1974. The flooding was caused by a major rainstorm that extended from Montana through Idaho and Washington. The most damage occurred in the Kootenai River drainage, centering around the town of Libby. Also unusually high flows occurred on some streams in the Clark Fork basin. Throughout the area, ice jams contributed to much of the overbank flooding. Both the towns of Troy and Libby were partly flooded, but damage was greatest in and near Libby. Flood damage was estimated to be $4.9 million. No flood fatalities were listed. Most of the smaller streams equaled or exceeded a 50-year flood. A summary of flood stages and discharges for 24 sites in the Kootenai River drainage and 8 sites in the Clark Fork drainage is tabulated. A map shows the extent of flooding in the Libby area. (Woodard-USGS)

Johnson, M.V.; Omang, R.J.

1974-01-01

194

Sinking velocity of particulate radiocesium in the northwestern North Pacific  

NASA Astrophysics Data System (ADS)

particles (SP) were collected by time series sediment traps at two depths in the northwestern Pacific before and after the Fukushima Daiichi Nuclear Power Plant accident, and accident-derived particulate radiocesium was measured. Radiocesium (137Cs) was first detected at 500 m (4810 m) about 2 weeks (1 month) after the accident. 137Cs of SP collected over 1 year revealed that the time lag between two depths was larger than that for the first 137Cs detection (about 2 weeks). We estimated the transient sinking velocity (SV) from the cumulative temporal 137Cs flux and the time lags at the two depths. Although the SV of SP collected in very early period was large, the estimated SV of most particulate 137Cs (about 80%) was about 50 m d-1. Based on comparison of 137Cs concentration in total SP with that in SP without organic materials, we suspect that most of the 137Cs was likely incorporated into aluminosilicates.

Honda, Makio C.; Kawakami, Hajime

2014-06-01

195

Land and federal mineral ownership coverage for northwestern Colorado  

USGS Publications Warehouse

This Arc/Info coverage contains land status and Federal mineral ownership for approximately 26,800 square miles in northwestern Colorado. The polygon coverage (which is also provided here as a shapefile) contains two attributes of ownership information for each polygon. One attribute indicates where the surface is State owned, privately owned, or, if Federally owned, which Federal agency manages the land surface. The other attribute indicates which minerals, if any, are owned by the Federal govenment. This coverage is based on land status and Federal mineral ownership data compiled by the U.S. Geological Survey (USGS) and three Colorado State Bureau of Land Management (BLM) former district offices at a scale of 1:24,000. This coverage was compiled primarily to serve the USGS National Oil and Gas Resource Assessment Project in the Uinta-Piceance Basin Province and the USGS National Coal Resource Assessment Project in the Colorado Plateau.

Biewick, L.H.; Mercier, T.J.; Levitt, Pam; Deikman, Doug; Vlahos, Bob

1999-01-01

196

Ankylosaur Remains from the Early Cretaceous (Valanginian) of Northwestern Germany  

PubMed Central

A fragmentary cervico-pectoral lateral spine and partial humerus of an ankylosaur from the Early Cretaceous (early Valanginian) of Gronau in Westfalen, northwestern Germany, are described. The spine shows closest morphological similarities to the characteristic cervical and pectoral spines of Hylaeosaurus armatus from the late Valanginian of England. An extensive comparison of distal humeri among thyreophoran dinosaurs supports systematic differences in the morphology of the distal condyli between Ankylosauria and Stegosauria and a referral of the Gronau specimen to the former. The humerus fragment indicates a rather small individual, probably in the size range of H. armatus, and both specimens are determined herein as ?Hylaeosaurus sp.. A short overview of other purported ankylosaur material from the Berriasian-Valanginian of northwest Germany shows that, aside from the material described herein, only tracks can be attributed to this clade with confidence at present. PMID:23560099

Sachs, Sven; Hornung, Jahn J.

2013-01-01

197

Middle Pleistocene age of the Nome River glaciation, northwestern Alaska  

NASA Astrophysics Data System (ADS)

During the middle Pleistocene Nome River glaciation of northwestern Alaska, glaciers covered an area an order of magnitude more extensive than during any subsequent glacial intervals. The age of the Nome River glaciation is constrained by laser-fusion {40Ar }/{39Ar} analyses of basaltic lava that overlies Nome River drift at Minnie Creek, central Seward Peninsula, that average 470,000 ± 190,000 yr (±1?). Milligram-size subsamples of the lava were dated to identify and eliminate extraneous 40Ar enrichments that rendered the mean of conventional K?Ar dates on larger bulk samples of the same flow too old (700,000 ± 570,000 yr). While the {40Ar }/{39Ar} analyses provide a minimum limiting age for the Nome River glaciation, maximum ages are provided by a provisional K?Ar date on a basaltic lava flow that underlies the Nome River drift at nearby Lave Creek, by paleomagnetic determinations of the drift itself at and near the type locality, and by amino acid epimerization analysis of molluscan fossils from nearshore sediments of the Anvilian marine transgression that underlie Nome River drift on the coastal plain at Nome. Taken together, the new age data indicate that the glaciation took place between 580,000 and 280,000 yr ago. The altitude of the Anvilian deposits suggests that eustatic sea level during the Anvilian transgression rose at least as high as and probably higher than during the last interglacial transgression; by correlation with the marine oxygen-isotope record, the transgression probably dates to stage 11 at 410,000 yr, and the Nome River glaciation is younger still. Analyses of floor altitudes of presumed Nome River cirques indicate that the Nome River regional snowline depression was at least twice that of the maximum late Wisconsin. The cause of the enhanced snowline lowering appears to be related to greater availability of moisture in northwestern Alaska during the middle Pleistocene.

Kaufman, Darrell S.; Walter, Robert C.; Brigham-Grette, Julie; Hopkins, David M.

1991-11-01

198

Understanding the Rainfall Daily Climatology of Northwestern Mexico  

NASA Astrophysics Data System (ADS)

Maximum monthly precipitation (MMP) over northwestern Mexico is not concurrent because it occurs in different months from July through September. However, instead of occurring progressively from one month to the next as latitude increases, as it might be logic since rains move progressively from south to north as monsoon develops, MMP occurs in July in latitudes of Jalisco state, then MMP shifts to August more to the north in latitudes of Nayarit state and along the eastern coast of the Gulf of California, then it occurs in July in higher latitudes through the main axis of the Sierra Madre Occidental (SMO), and finally MMP shifts to September to the west in the California Peninsula. The maximum monthly streamflow occurs in a similar pattern as MMP does but one month later. When daily rainfall climatology of the region is calculated, i.e. the long-term mean per day from stations with more than 20 years of data between 1940 and 2004, it is possible to understand why the behavior of MMP occurs in a July-August-July pattern from south to north. Preliminary results indicate that at latitudes of Nayarit state normal frequent storms with abundant rains develop at the end of July and through the August. These rains sum to the rains that move from the south to the north, as monsoon develops increasing the volume of precipitations at those latitudes in August. To the east crossing the SMO through northwestern Zacatecas state maximum volume of precipitations also is observed in August. However, in higher latitudes it is not observed any increment of rains in August and consequently maximum volume of precipitations occurs in July. To understand the dynamics of the rains at the latitudes of Nayarit state it results necessary to investigate the source of these local rains and explain why the increase of precipitations in August is limited at those latitudes.

Brito-Castillo, L.

2007-05-01

199

The Idaho cobalt belt, northwestern United States — A metamorphosed Proterozoic exhalative ore district  

NASA Astrophysics Data System (ADS)

In the Idaho cobalt belt, originally exhalative, stratiform mineralization within the Proterozoic Yellow-jacket Formation has become increasingly coarse-grained and remobilized toward the northwest in the direction of increasing regional metamorphic grade. The Idaho cobalt belt is located about 40 km west of Salmon, Idaho in the northwestern United States. The most important deposit in the district is the Blackbird mine which produced copper-cobalt ore sporadically from the early 1900's until about 1960. The Iron Creek deposit at the southeast end of the belt has undergone greenschist fades, biotite zone metamorphism; zones of disseminated, veinlet and massive sulfides lie more or less parallel to bedding of quartzites and phyllites. The main ore minerals are chalcopyrite and cobaltiferous pyrite. Toward the northwest at the Blackpine mine, remobilization has concentrated most of the mineralization into relatively thin concordant and discordant veins containing chalcopyrite, pyrite and arsenopyrite. The cobalt is reported to occur within arsenopyrite. Further northwest at the Blackbird mine where the Yellowjacket formation has been metamorphosed to the lower amphibolite facies, zones of disseminated and coarse-grained vein ores lie approximately along the same stratigraphic zone. Chalcopyrite, cobaltite, arsenopyrite, pyrite and pyrrhotite are the dominant ore minerals. Up to 0.22 oz. Au/ton was present in some of the ore. In addition, tourmaline-bearing sedimentary rocks (tourmalinites) are associated with some of the Blackbird ores. The Salmon Canyon deposit at the northwest end of the belt has undergone upper amphibolite facies, sillimanite zone metamorphism. In these garnet-sillimanite gneisses, chalcopyrite is found as coarse blebs and cobaltite as large porphyroblastic crystals. Gold occurs in amounts up to 0.02 oz. Au/ton. Elsewhere in the world the two most similar districts are the cobalt-bearing portion of the Zambian-Zairian Copperbelt of central Africa where Proterozoic Roan sedimentary rocks contain stratiform copper-cobalt ore-bodies over a distance of more than 500 kilometers, and the Sheep Creek district of Meagher County, Montana, which contains strata-bound copper-cobalt mineralization. The Idaho cobalt belt is a strata-bound copper-cobalt district hosted by the Proterozoic Yellowjacket Formation and located in east-central Idaho within Lemhi County, approximately 40 kilometers west of Salmon, Idaho, northwestern United States (Fig. 1). Of the four main deposits described here (from southeast to northwest, the Iron Creek, Blackpine, Blackbird, and the Salmon Canyon deposits), the Blackbird mine is the most important in the district. It was discovered in 1893 and sporadically produced copper and cobalt until about 1960. The Yellowjacket Formation has undergone an increasing degree of metamorphism toward the northwest. The deposits are largely strata-bound in a belt over 50 km in length, strongly suggesting a syngenetic mode of origin. However, the proximity of the district to satellitic granitic plutons of the Idaho batholith has prompted many investigators to suggest an epigenetic hydrothermal origin (Anderson 1947 and Purdue 1975). Remobilization of some of the mineralization into veins at the Blackbird mine, where most of the previous work has been concentrated, has also suggested an epigenetic origin. A more district-wide view of the mineralization points to a strong degree of stratigraphic control.

Nold, J. L.

1990-07-01

200

A termite (Isoptera) in Late Cretaceous amber from Vendée, northwestern France  

E-print Network

A new genus and species of primitive termite is described and figured from the remains of an alate in Late Cretaceous (Cenomanian to Santonian) amber from the Department of Vendée in northwestern France. Termitotron vendeense n. gen. and sp...

Engel, Michael S.

2014-12-01

201

76 FR 27171 - Northwestern Pacific Railroad Co.; Notice of Partial Relief from Emergency Order No. 21  

Federal Register 2010, 2011, 2012, 2013, 2014

...DEPARTMENT OF TRANSPORTATION Federal Railroad Administration [FRA Emergency Order...Notice No. 4] Northwestern Pacific Railroad Co.; Notice of Partial Relief...Emergency Order No. 21 AGENCY: Federal Railroad Administration (FRA),...

2011-05-10

202

76 FR 4551 - Hawaii Crustacean Fisheries; 2011 Northwestern Hawaiian Islands Lobster Harvest Guideline  

Federal Register 2010, 2011, 2012, 2013, 2014

...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XA159 Hawaii Crustacean Fisheries; 2011 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

2011-01-26

203

78 FR 9327 - Hawaii Crustacean Fisheries; 2013 Northwestern Hawaiian Islands Lobster Harvest Guideline  

Federal Register 2010, 2011, 2012, 2013, 2014

...DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration 50 CFR Part 665 RIN 0648-XC453 Hawaii Crustacean Fisheries; 2013 Northwestern Hawaiian Islands Lobster Harvest Guideline AGENCY: National Marine Fisheries...

2013-02-08

204

Topographically controlled grassland soils in the Boreal Cordillera ecozone, northwestern Canada  

E-print Network

Topographically controlled grassland soils in the Boreal Cordillera ecozone, northwestern Canada 2009, accepted 16 October 2009. Sanborn, P. 2010. Topographically controlled grassland soils relationships of grassland soils were examined at three widely separated sites (Stikine River Valley, British

Sanborn, Paul

205

ATMOSPHERIC VOLATILE HYDROCARBON COMPOSITION AT FIVE REMOTE SITES IN NORTHWESTERN NORTH CAROLINA  

EPA Science Inventory

The results of a study to measure the volatile hydrocarbon composition of the atmosphere at several sites in the southern Appalachian Mountains of northwestern North Carolina are presented. Ambient air was sampled repeatedly at five geographically and botanically different remote...

206

Northwestern University Archives Evanston, Illinois Records of the Young Women's Christian Association (YWCA),  

E-print Network

-front boxes 1 History The Young Women's Christian Association (YWCA) is an international, non- denominationalNorthwestern University Archives Evanston, Illinois Records of the Young Women's Christian, Christian organization, patterned after, but independent of, the Young Men's Christian Association (YMCA

207

Evidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern North America  

E-print Network

) and bull trout (Salvelinus confluentus) have widely overlapping, but largely parapatric ranges in waterEvidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern; reproductive isolation; salmonidae; speciation. Abstract Dolly Varden (Salvelinus malma, Pisces: Salmonidae

Taylor, Eric B. "Rick"

208

[High energy physics research]: Annual performance report, December 1, 1991--November 30, 1992. [Northwestern Univ  

SciTech Connect

The various segments of the Northwestern University high energy physics research program are reviewed. Work is centered around experimental studies done primarily at FNAL; associated theoretical efforts are included.

Rosen, J.; Block, M.; Buchholz, D.; Gobbi, B.; Schellman, H.; Buchholz, D.; Rosen, J.; Miller, D.; Braaten, E; Chang, D; Oakes, R.; Schellman, H.

1992-01-01

209

Diagnosis of Annosus Root Disease in Mixed Conifer Forests in the Northwestern United States1  

E-print Network

. (= Fomes annosus (Fr.) Karst.) is a common cause of root and butt decay of conifers in the northwestern. concolor) and Pacific silver fir (A. amabilis). The damage resulting from infection may include butt symptoms, even when extensive butt and

Standiford, Richard B.

210

40 CFR 81.184 - Northwestern Connecticut Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...false Northwestern Connecticut Intrastate Air Quality Control Region. 81.184 Section 81...CONTINUED) DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES Designation of Air Quality Control Regions § 81.184...

2010-07-01

211

The feeding ecology of the loggerhead sea turtle in the northwestern Gulf of Mexico  

E-print Network

THE FEEDING ECOLOGY OF THE LOGGERHEAD SEA TURTLE IN THE NORTHWESTERN GULF OF MEXICO A Thesis PAMELA TERRY PLOTKIN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE August 1989 Major Subject: Zoology THE FEEDING ECOLOGY OF THE LOGGERHEAD SEA TURTLE IN THE NORTHWESTERN GULF OF MEXICO A Thesis by PAMELA TERRY PLOTKIN Approved as to style and content by: Mary K. Wicksten (Chair of Committee...

Plotkin, Pamela Terry

1989-01-01

212

Life-history traits and potential invasiveness of introduced pumpkinseed Lepomis gibbosus populations in northwestern Europe  

Microsoft Academic Search

To evaluate the potential invasiveness of pumpkinseed Lepomis gibbosus introduced to northwestern European inland waters, growth and reproduction traits were examined in ten populations along\\u000a a trajectory spanning northwestern Europe (Norway, England, Holland, Belgium and France) and evaluated in light of published\\u000a dataset from Europe. In the 848 pumpkinseed captured, maximum age was 3–4 years, with a sex ratio near unity

Julien Cucherousset; Gordon H. Copp; Michael G. Fox; Erik Sterud; Hein H. van Kleef; Hugo Verreycken; Eva Záhorská

2009-01-01

213

A volumetric temperature-salinity census for the continental shelf of the northwestern Gulf of Mexico  

E-print Network

A VOLUMETRIC TEMPERATURE-SALINITY CENSUS FOR THE CONTINENTAL SHELF OF THE NORTHWESTERN GULF OF MEXICO A Thesis by WILLIAM FRANCIS ULM Submitted to the Graduate College of Texas A&M University in partxal fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 19B3 Major Subject: Oceanography A VOLUMETRIC TEMPERATURE-SALINITY CENSUS FOR THE CONTINENTAL SHELF OF THE NORTHWESTERN GULF OF MEXICO A Thesis by WILLIAM FRANCIS ULM Approved as to style and content by: John...

Ulm, William Francis

2012-06-07

214

Eolian and fluvial facies in sandstones of Queen Formation, Permian basin, Texas  

SciTech Connect

The Queen Formation (Guadalupian) is a sequence of carbonates, evaporites, and sandstones that is found across the Northwestern shelf and Central Basin platform of the Permian basin. Cores, logs, and thin sections of the Queen sandstones, which are commonly stratigraphic traps for oil, were examined in five fields in order to determine their sedimentation history.

Mazzullo, J.; Malicse, A.; Siegel, J.; Holley, C.; Bilir, S.; Mazzullo, S.J.

1988-02-01

215

Reservoir Model of the Jacksonburg-Stringtown Oil Field; Northwestern West Virginia: Potential for Miscible Carbon Dioxide Enhanced Oil Recovery  

NASA Astrophysics Data System (ADS)

Located in northwestern West Virginia, the Jacksonburg-Stringtown field has produced over 22 million barrels of oil (MMBO) since its discovery in 1895. The primary producing interval within the field is the Late Devonian Gordon Stray. Log analysis shows this formation to represent an estuarine depositional system. Four subunits within the formation are defined based on depositional framework: barrier sand, central bay shale, estuarine channels, and fluvial channel subunits. RHOmaa/Umaa lithological composition plots support the conclusion of a marine-influenced estuarine depositional framework. Structural and isopach maps generated with data from 73 local wells reveal a northeast-southwest trending sand deposit of 15-35 foot thickness, which is interpreted as the depocenter for the incised valley of the Gordon Stray. Analysis of formation horizon maps shows that the reservoir is synclinal and, as a result, contains a stratigraphic trap as opposed to the more common structural traps found in the immediate area. Porosity and pore-feet distribution maps indicate high porosity regions in southern regions of the field and high pore volume in northern areas. A miscible CO2 flood model estimates that an additional 7.3 MMBO could be recovered from the high porosity regions in the southern half of the field. The Jacksonburg-Stringtown field is well-suited for enhanced oil recovery and/or geologic CO2 sequestration.

Bergerud, Blake

216

Biogeomorphic processes and archaeological site formation in Absaroka Mountains of northwestern Wyoming.  

E-print Network

??Archaeologists frequently associate Thomomys talpoides, the Northern Pocket Gopher, with the loss of stratigraphic integrity (Bocek 1986; Morin 2006). Disturbance from subsurface burrowing and the… (more)

Bechberger, Jillian M.

2010-01-01

217

A diminutive pelecinid wasp from the Eocene Kishenehn Formation of northwestern Montana (Hymenoptera: Pelecinidae)  

E-print Network

and in Portico (www.portico.org), and printed on demand by Southwestern Oklahoma State University Press. Editor-in-Chief Michael S. Engel University of Kansas Ryan C. McKellar Royal Saskatchewan Museum Assistant Editors Jaime Ortega-Blanco Universitat de...

Greenwalt, Dale; Engel, Michael S.

2014-07-01

218

Brittle tectonics within the Jurassic formations of the Ouarsenis culminating area, northwestern Algeria  

NASA Astrophysics Data System (ADS)

Brittle structures within the Ouarsenis culminating zone were studied in order to characterize the polyphased tectonics. Field observations revealed that the dominant structures are highly tilted. They are represented by faults and joints, shears, reverse or curvilinear, locally associated with gypsum intrusions. Field data analysis shows that large scale shear faults are localized within the limits of the structural entities. Two main tectonic phases, having affected the Ouarsenis culminating zone were identified: (i) A NW-SE oriented compressive phase, represented by the contacts marked out by in-depth reverse faults and folding, mainly located in the westernmost part of Sra Abdelkader, Rokba Atba and in the western part of Batha, Fartas and Belkeiret (thrusts), respectively. This phase was also identified in reverse and sinistral faulting within Sidi Djber at the easternmost part of Sra Abdelkader, and the Grand Pic and the southern massif of Belkheiret respectively. (ii) A NNE-SSW oriented compressive phase, characterized by dextral strike-slips, is located in the easternmost part of Sra Abdelkader and Rokba Atba. North of the Grand Pic, a sinistral ?N120° oriented shearing occurred, with a lateral slip reaching ?2 km. The examination and the data analysis show a major N110-120° oriented fault with a sinistral signature. This movement would be responsible for block rotations and tilts. Counterclockwise rotations of the paleostress of ?38° and ?43° from west to east of the Sra Abdelkader massif and from Belkeiret to Batha, Fartas blocks were recorded, respectively. This local change of the stress field is mainly due to a deformation controlled by the regional post-Miocene geodynamic system, possibly explained by the proposed model.

Aïfa, Tahar; Zaagane, Mansour

2014-08-01

219

Paleostress pattern and salt tectonics within a developing foreland basin (north-western Subhercynian Basin, northern Germany)  

NASA Astrophysics Data System (ADS)

Analysing the paleostress field in sedimentary basins is important for understanding tectonic processes and the planning of drilling campaigns. The Subhercynian Basin of northern Germany is a perfect natural laboratory to study the paleostress field in a developing foreland basin. The simple layer-cake geometry of the basin-fill is dominated by several piercing and non-piercing salt structures. We derived the paleostress field from the orientation of fracture sets, faults, slickensides and stylolites. On a regional scale, the basin-fill is characterized by a horizontal compressional paleostress vector that is mainly NNE-SSW-oriented, which reflects the Late Cretaceous inversion phase in Central Europe. We show that the local paleostress field is distinctly perturbated due to the salt structures. Along the edge of the salt pillows, the maximum horizontal paleostress vector is deflected by up to 90° from the regional trend. In the case of the Elm salt pillow, it forms a radial pattern. Restoration of balanced cross-sections demonstrates at least 9 % of the shortening of the north-western part of the Subhercynian Basin was achieved by folding. The salt structures in the north-western Subhercynian Basin are the result of varying stress conditions. Initial extension in the Triassic caused first salt movements that prevailed during the Jurassic and Early Cretaceous. Most important is the Late Cretaceous contractional phase that shortened the diapirs and led to the formation of the salt pillows between diapirs due to detachment folding. We derive four main controlling factors for such salt-dominated contractional basins: (1) the wedge-shape basin-fill is the product of the dynamic load at the southern margin of the basin, (2) a basal salt layer fed the diapirs and acted as a detachment horizon during the later shortening, (3) detachment folding was the dominating deformation mechanism during contraction, and (4) the pre-existing diapirs controlled the position of the detachment folds.

Brandes, Christian; Schmidt, Carolin; Tanner, David Colin; Winsemann, Jutta

2013-11-01

220

JCMC Home Submit Issues Author Index Editors About JCMC Cassell, J., and Tversky, D. (2005). The language of online intercultural community formation. Journal of  

E-print Network

language as an index of integration vs. the maintenance of separate cultural, age, and gender identities). The language of online intercultural community formation. Journal of Computer-Mediated Communication, 10 Community Formation Justine Cassell Technology and Social Behavior, Northwestern University Dona Tversky

Cassell, Justine

221

VERTICAL EXTRAPOLATION OF MARS MAGNETIC POTENTIALS. Donna M. Jurdy, Michael Stefanick, Department of Geological Sciences, Northwestern University, Evanston IL 60208-2150, donna@earth.northwestern.edu.  

E-print Network

VERTICAL EXTRAPOLATION OF MARS MAGNETIC POTENTIALS. Donna M. Jurdy, Michael Stefanick, Department@earth.northwestern.edu. Introduction: Mars Global Surveyor MAG/ER measured strongly magnetized crust; despite Mars' weak field Southern hemisphere. Data was used from the mapping phase of Mars Global Surveyor, MAG/ER magnetic

Jurdy, Donna M.

222

VERTICAL EXTRAPOLATION OF MARS MAGNETIC STREAMLINE FUNCTION TO SURFACE. Donna M. Jurdy, Michael Stefanick, Dept. of Geological Sciences, Northwestern University, Evanston IL 60208, donna@earth.northwestern.edu.  

E-print Network

VERTICAL EXTRAPOLATION OF MARS MAGNETIC STREAMLINE FUNCTION TO SURFACE. Donna M. Jurdy, Michael@earth.northwestern.edu. Introduction: Mars Global Surveyor (MGS) measured the most strongly magnetized crust in the heavily-cratered southern hemisphere of Mars, with the magnetic intensity reaching nearly 10 times that of Earth's magnetic

Jurdy, Donna M.

223

4 Easy stEps to ComputEr sECurity Northwestern University Information Technology | www.it.northwestern.edu  

E-print Network

watch streaming movies online instead of downloading them. That's safer, isn't it?" #12;These are all is provided by NUIT free for download at . Pre-installed firewalls.it.northwestern.edu/getcontrol/stepfour.html> BroWSe Safely Stay Aware OnThe Internet -- It Can KeepYouVirus Free Good safety h

Shahriar, Selim

224

Summer Session at Northwestern is a great time to get ahead, learn something new and enjoy all that Northwestern has to offer.  

E-print Network

Summer Session at Northwestern is a great time to get ahead, learn something new and enjoy all courses offer a unique opportunity to delve deeply into the study of a language. · Arabic · German Internships and Summer Field Studies Explore our off-campus summer programs that supplement classroom learning

Shull, Kenneth R.

225

Community Problems in Eight Northwestern Counties. Report No. 1 of a Series on Quality of Life and Development in Northwestern Wisconsin, January 1976.  

ERIC Educational Resources Information Center

As part of a study of the quality of life in northwestern Wisconsin, questions re: important problems, public services, and environmental concerns were asked of a sample of 150 people in each of 5 counties (Bayfield, Douglas, Price, Taylor, and Washburn) in 1974. Responses to similar questions asked in a 1973 study of Ashland, Burnett, and Rusk…

Lambert, Virginia

226

34th Annual Ray Garrett Jr. Corporate and Securities Law Institute May 1-2, 2014 Northwestern Law, Chicago www.law.northwestern.edu/professionaled  

E-print Network

, Chicago www.law.northwestern.edu/professionaled AFFILIATE PROPOSAL May 1­2, 2014 | Chicago 34th Annual Ray, so extend your many registrations to your firm colleagues. · Marketing, Business Development unique marketing mix of print, e-mail, and online advertising. Build your network and increase your

Shahriar, Selim

227

Rangewide landscape genetics of an endemic Pacific northwestern salamander.  

PubMed

A species' genetic structure often varies in response to ecological and landscape processes that differ throughout the species' geographic range, yet landscape genetics studies are rarely spatially replicated. The Cope's giant salamander (Dicamptodon copei) is a neotenic, dispersal-limited amphibian with a restricted geographic range in the Pacific northwestern USA. We investigated which landscape factors affect D. copei gene flow in three regions spanning the species' range, which vary in climate, landcover and degree of anthropogenic disturbance. Least cost paths and Circuitscape resistance analyses revealed that gene flow patterns vary across the species' range, with unique combinations of landscape variables affecting gene flow in different regions. Populations in the northern coastal portions of the range had relatively high gene flow, largely facilitated by stream and river networks. Near the southeastern edge of the species' range, gene flow was more restricted overall, with relatively less facilitation by streams and more limitation by heat load index and fragmented forest cover. These results suggested that the landscape is more difficult for individuals to disperse through at the southeastern edge of the species' range, with terrestrial habitat desiccation factors becoming more limiting to gene flow. We suggest that caution be used when attempting to extrapolate landscape genetic models and conservation measures from one portion of a species' range to another. PMID:23293948

Trumbo, Daryl R; Spear, Stephen F; Baumsteiger, Jason; Storfer, Andrew

2013-03-01

228

Mountain goat response to hydroelectric exploration in northwestern British Columbia  

SciTech Connect

The behavioral responses of more than 800 mountain goats, comprised of 195 social groups, were recorded during hydroelectric exploration activities (primarily aircraft) in northwestern British Columbia. Four categories of overt response were recorded during case tests, ranging from maintenance activity to severe flight. More than 80 percent (n=667) of the observed goats elicited some form of behavioral stress-response, with 33 percent (n=265) displaying a severe flight response to local rock or plant cover. Multiple regression analysis inferred goat responses to be statistically independent of the time of year, type, and vertical orientation of disturbance and group size. As expected, significant correlations (p less than or equal to 0.05) existed between distance of disturbance, geographic area, cover availability, and degree of awareness. Responses were stimulated primarily by auditory and secondarily by visual cues. Repeated aerial and ground follow-up surveys documented temporary range abandonment and changing observability indices (habitat use and activity patterns) associated with areas of intense exploration activity. The assessed data offer mitigation possibilities and enable formulation of management guidelines to lessen project impacts during future exploration, construction, and operation phases.

Foster, B.R.; Rahs, E.Y.

1983-03-01

229

Northwestern University Schizophrenia Data and Software Tool (NUSDAST)  

PubMed Central

The schizophrenia research community has invested substantial resources on collecting, managing and sharing large neuroimaging datasets. As part of this effort, our group has collected high resolution magnetic resonance (MR) datasets from individuals with schizophrenia, their non-psychotic siblings, healthy controls and their siblings. This effort has resulted in a growing resource, the Northwestern University Schizophrenia Data and Software Tool (NUSDAST), an NIH-funded data sharing project to stimulate new research. This resource resides on XNAT Central, and it contains neuroimaging (MR scans, landmarks and surface maps for deep subcortical structures, and FreeSurfer cortical parcellation and measurement data), cognitive (cognitive domain scores for crystallized intelligence, working memory, episodic memory, and executive function), clinical (demographic, sibling relationship, SAPS and SANS psychopathology), and genetic (20 polymorphisms) data, collected from more than 450 subjects, most with 2-year longitudinal follow-up. A neuroimaging mapping, analysis and visualization software tool, CAWorks, is also part of this resource. Moreover, in making our existing neuroimaging data along with the associated meta-data and computational tools publically accessible, we have established a web-based information retrieval portal that allows the user to efficiently search the collection. This research-ready dataset meaningfully combines neuroimaging data with other relevant information, and it can be used to help facilitate advancing neuroimaging research. It is our hope that this effort will help to overcome some of the commonly recognized technical barriers in advancing neuroimaging research such as lack of local organization and standard descriptions. PMID:24223551

Wang, Lei; Kogan, Alex; Cobia, Derin; Alpert, Kathryn; Kolasny, Anthony; Miller, Michael I.; Marcus, Daniel

2013-01-01

230

Geomorphic surfaces in the northwestern Klamath Mountains, California and Oregon  

SciTech Connect

Thick, residual, colluvial and alluvial soils derived from ophiolitic rocks mantle at least four geomorphic surfaces in the Siskiyou and marble mountains, in northwestern California and Illinois Valley, in southwestern Oregon. Analysis of digital elevation data provides constraints on the distribution and origin of these surfaces. Because of the geomorphic expression and soil mechanical properties of the surfaces, a map of slope gradients less than 22 degrees closely approximates the distribution of geomorphic surfaces as they are known from field observations. Preliminary definition of individual surfaces is based upon classification of the slop-map by elevation ranges. The Klamath Peneplain'' of Diller (1902) and associated soils, recently referred to as Klamath Saprolite'', are recognized near summit elevation (1,500 meters) across the area. Regional uplift and erosion has resulted in extensive, large earthflow landslides derived from these soils. Alluvial and residual deposits on the floor of the Illinois Valley occur at the same elevation (300 meters) as incised alluvial and colluvial terrace deposits along the Klamath River and tributary streams. At least two additional surfaces have been identified in the Siskiyou and Marble Mountains at approximately elevation 750 and 1,000 meters. Analysis of digital elevation data, combined with the map of earthflow landslides, allows rapid preliminary mapping of geomorphic surfaces in this terrain.

Baldwin, K.S. (Forest Service, Happy Camp, CA (United States)); Ricks, C.L. (Forest Service, Gold Beach, OR (United States))

1993-04-01

231

Drought induces spruce beetle (Dendroctonus rufipennis) outbreaks across northwestern Colorado.  

PubMed

This study examines influences of climate variability on spruce beetle (Dendroctonus rufipennis) outbreak across northwestern Colorado during the period 1650 2011 CE. Periods of broad-scale outbreak reconstructed using documentary records and tree rings were dated to 1843-1860, 1882-1889, 1931-1957, and 2004-2010. Periods of outbreak were compared with seasonal temperature, precipitation, vapor pressure deficit (VPD), the Palmer Drought Severity Index (PDSI), and indices of ocean-atmosphere oscillation that include the El Niño Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO). Classification trees showed that outbreaks can be predicted most successfully from above average annual AMO values and above average summer VPD values, indicators of drought across Colorado. Notably, we find that spruce beetle outbreaks appear to be predicted best by interannual to multidecadal variability in drought, not by temperature alone. This finding may imply that spruce beetle outbreaks are triggered by decreases in host tree defenses, which are hypothesized to occur with drought stress. Given the persistence of the AMO, the shift to a positive AMO phase in the late 1990s is likely to promote continued spruce beetle disturbance. PMID:24933812

Hart, Sarah J; Veblen, Thomas T; Eisenhart, Karen S; Jarvis, Daniel; Kulakowski, Dominik

2014-04-01

232

Antimicrobial activity of Northwestern Mexican plants against Helicobacter pylori.  

PubMed

Helicobacter pylori is the major etiologic agent of such gastric disorders as chronic active gastritis and gastric carcinoma. Over the past few years, the appearance of antibiotic-resistant bacteria has led to the development of better treatments, such as the use of natural products. This study evaluated the anti-H. pylori activity of 17 Mexican plants used mainly in the northwestern part of Mexico (Sonora) for the empirical treatment of gastrointestinal disorders. The anti-H. pylori activity of methanolic extracts of the plants was determined by using the broth microdilution method. The 50% minimum inhibitory concentrations ranged from less than 200 to 400 ?g/mL for Castella tortuosa, Amphipterygium adstringens, Ibervillea sonorae, Pscalium decompositum, Krameria erecta, Selaginella lepidophylla, Pimpinella anisum, Marrubium vulgare, Ambrosia confertiflora, and Couterea latiflora and were greater than 800??g/mL for Byophyllum pinnatum, Tecoma stans linnaeus, Kohleria deppena, Jatropha cuneata, Chenopodium ambrosoides, and Taxodium macronatum. Only Equisetum gigantum showed no activity against H. pylori. This study suggests the important role that these plants may have in the treatment of gastrointestinal disorders caused by H. pylori. The findings set the groundwork for further characterization and elucidation of the active compounds responsible for such activity. PMID:21663492

Robles-Zepeda, Ramón E; Velázquez-Contreras, Carlos A; Garibay-Escobar, Adriana; Gálvez-Ruiz, Juan C; Ruiz-Bustos, Eduardo

2011-10-01

233

Epidemiology of flavescence dorée in vineyards in northwestern Italy.  

PubMed

ABSTRACT A serious outbreak of flavescence dorée (FD) was reported in Piemonte, northwestern Italy, in 1998, and since then, the disease has compromised the economy of this traditional wine-growing area, even following the application of compulsory insecticide treatments to control Scaphoideus titanus, the vector of the causal phytoplasma. Affected vines show severe symptoms, varying according to the cultivar, and are rogued to reduce disease spread. Following winter and pruning, a previously affected vine may appear symptomless and free of phytoplasmas in its aerial as well as its root system, even by nested-polymerase chain reaction assays. Such plants are considered to be "recovered". Since 1998 homogenous data on the incidence of newly infected, healthy, or recovered plants productivity, presence of vectors, and treatment schedules have been collected in seven severely affected vineyards of southern Piemonte for 5 years (1999 to 2003). Infectivity and recovery rates were also calculated each year. From 1999 to 2003, the average number of healthy plants decreased and the numbers of recovered plants and those with symptoms increased. Productivity of recovered vines, although lower than that of healthy ones, was always higher than that of vines with symptoms and was not influenced by the time elapsed from date of recovery. The relationships between the ln-transformed number of vectors trapped in the vineyards the previous year and the infection and the recovery rates were fitted by an exponential (R(2) = 0.95) and an asymptotic (R(2) = 0.93) model, respectively. PMID:18943511

Morone, C; Boveri, M; Giosuè, S; Gotta, P; Rossi, V; Scapin, I; Marzachì, C

2007-11-01

234

Reconstruction of the pre-Merida glaciation, northwestern Venezuelan Andes  

NASA Astrophysics Data System (ADS)

Valley glaciers have been well studied in the northwestern Venezuelan Andes over the last 20-year period but most reconstructions have been limited to the Last Glacial Maximum (LGM). Analyses have been confined to the mapping of moraine positions and the detailed analysis of pedostratigraphic sequences reaching back through the Middle to the Early Wisconsinan (Weichselian) Glaciation. Using bedding macrofeatures, fabric analysis (magnetic azimuths) with mirror images, clast inclination and microtextural evidence much has been learned about the lithology, source of ice, growth of an ice cap in the eastern cordillera and weathered state of surface paleosols. Analysis of two sections of pre-Mérida age, the only two such sections known in the Sierra de Santa Domingo (eastern cordillera), provides new information on lithology, source of the ice and weathered state of sediment of pre-Mérida age. The fabric in these sections is used to deduce the build-up of valley ice in the lower El Caballo Valley from an ice cap similar to one that developed later in Early Mérida time (~ 90 ka to ~ 65 ka). The presence of weathered tills in both sections suggests two glaciations perhaps correlative with the Illinoian and Kansan glaciations of North America. The weathered state of tills and outwash in both sections is assessed on the basis of geochemical (INAA) and mineral composition (XRD) and microtextural evidence determined by SEM/EDS.

Mahaney, William C.; Kalm, Volli; Menzies, John; Hancock, Ronald G. V.; Milner, Michael W.

2010-10-01

235

Mountain goat response to hydroelectric exploration in northwestern British Columbia  

NASA Astrophysics Data System (ADS)

The behavioral responses of more than 800 mountain goats, comprised of 195 social groups, were recorded during hydroelectric exploration activities (primarily aircraft) in northwestern British Columbia. Four categories of overt response were recorded during case tests, ranging from maintenance activity to severe flight. More than 80 percent ( n=667) of the observed goats elicited some form of behavioral stress-response, with 33 percent ( n=265) displaying a severe flight response to local rock or plant cover. Multiple regression analysis inferred goat responses to be statistically independent of the time of year, type, and vertical orientation of disturbance and group size. As expected, significant correlations ( p?0.05) existed between distance of disturbance, geographic area, cover availability, and degree of awareness. Responses were stimulated primarily by auditory and secondarily by visual cues. Repeated aerial and ground follow-up surveys documented temporary range abandonment and changing observability indices (habitat use and activity patterns) associated with areas of intense exploration activity. The assessed data offer mitigation possibilities and enable formulation of management guidelines to lessen project impacts during future exploration, construction, and operation phases.

Foster, Bryan R.; Rahs, Engel Y.

1983-03-01

236

Hydrogeologic framework of the Maku area basalts, northwestern Iran  

NASA Astrophysics Data System (ADS)

The Maku area in northwestern Iran is characterized by young lava flows which erupted from Mount Ararat in Turkey. These fractured volcanic rocks overlie alluvium associated with pre-existing rivers and form a good basalt-alluvium aquifer over an area of 650 km2. Groundwater discharge occurs from 12 large springs, ranging from 20 to 4,000 L s-1, and from some extraction wells. Permian and Oligo-Miocene age limestones along the northern boundary of the Bazargan and Poldasht Plains basalts are intensively karstified and groundwater from these high lands easily enters the basalt-alluvium aquifers. The transmissivity of the basalt-alluvium aquifer ranges from 24 to 870 m2 d-1, indicating heterogeneity. Groundwater of the aquifer is a sodium-bicarbonate and mixed cation-bicarbonate type and the concentration of fluoride is higher than the universal maximum admissible concentrations for drinking. In order to determine the chemical composition and identify the source of the high fluoride concentrations in the groundwater of the basaltic area, water samples from the springs, wells and rivers were analyzed. The results indicate that the high fluoride water enters the study area from the Sari Su River.

Asghari Moghaddam, Asghar; Fijani, Elham

2009-06-01

237

Survival of radiomarked canvasback ducklings in northwestern Minnesota  

USGS Publications Warehouse

Duckling survival, an important factor affecting annual recruitment, has not been determined adequately for canvasbacks (Aythya valisineria). We investigated the magnitude, timing, and causes of mortality of canvasback ducklings from hatch to fledging at the Agassiz National Wildlife Refuge (NWR) in northwestern Minnesota during 1987-90. During the 4 years, 217 day-old ducklings were radiomarked and released in 52 broods. Another 141 ducklings were radiomarked at greater than or equal to 4weeks of age. Survival was estimated with the Kaplan-Meier nonparametric estimator and the Weibull parametric model. Most mortalities occurred within 10 days after hatch. Total brood loss occurred in 18 (85%) of 52 broods released. The primary sources of mortality were predation principally by mink (Mustela vison), and exposure to precipitation and cold temperature. For combined years, females had lower survival than males (P=0.03). If the disparate survival between sexes of canvasbacks observed in this study is representative of canvasbacks in their breeding range, this phenomenon contributes to reduced reproductive potential and the male-biased sex ratio of the species.

Korschgen, Carl E.; Kenow, Kevin P.; Green, William L.; Johnson, Douglas H.; Samuel, Michael D.; Sileo, Louis

1996-01-01

238

Survival of radiomarked canvasback ducklings in northwestern Minnesota  

USGS Publications Warehouse

Duckling survival, an important factor affecting annual recruitment, has not been determined adequately for canvasbacks (Aythya valisineria). We investigated the magnitude, timing, and causes of mortality of canvasback ducklings from hatch to fledging at the Agassiz National Wildlife Refuge (NWR) in northwestern Minnesota during 1987-90. During the 4 years, 217 day-old ducklings were radiomarked and released in 52 broods. Another 141 ducklings were radiomarked at 4 weeks of age. Survival was estimated with the Kaplan-Meier nonparametric estimator and the Weibull parametric model. Most mortalities occurred within 10 days after hatch. Total brood loss occurred in 18 (35%) of 52 broods released. The primary sources of mortality were predation, principally by mink (Mustela vison), and exposure to precipitation and cold temperature. For combined years, females had lower survival than males (P = 0.03). If the disparate survival between sexes of canvasbacks observed in this study is representative of canvasbacks in their breeding range, this phenomenon contributes to reduced reproductive potential and the male-biased sex ratio of the species.

Korschgen, C.E.; Kenow, K.P.; Green, W.L.; Johnson, D.H.

1996-01-01

239

Late Devonian conodonts and event stratigraphy in northwestern Algerian Sahara  

NASA Astrophysics Data System (ADS)

Conodonts recovered from the Late Devonian South Marhouma section comprise 5 genera with 31 species (3 undetermined). The fauna establishes the presence of MN Zones 5, undifferentiated 6/7, 8/10 for the Middle Frasnian, the MN Zones 11, 12, 13 for the Upper Frasnian as well as the Early through Late triangularis Zones in the basal Famennian. The outcropping lithological succession is one of mostly nodular calcilutites alternating with numerous marly and shaly deposits, which, in the lower and upper part, comprise several dysoxic dark shale intervals. Among these the Upper Kellwasser horizon can be precisely dated and as such the presence of the terminal Frasnian Kellwasser Event is recognized for the first time in Algeria. Both the Middlesex and Rhinestreet Events cannot yet be precisely located, but supposedly occur among the dark shale horizons in the lower part of the section. However, their assignment to a precise level has so far not been established. Though poor in conodont abundance the South Marhouma section provides first evidence of the presence of several Montagne Noire conodont zones within the so far widely unstudied Frasnian of the Ougarta Chain. As such it is considered representative for the northwestern Algerian Saoura region.

Mahboubi, Abdessamed; Gatovsky, Yury

2015-01-01

240

Paleomagnetic and Clay ?18O Ages for Weathering in Northwestern NSW, Australia  

NASA Astrophysics Data System (ADS)

There is a complex history of erosion, deposition, tectonism and weathering relating to the Surat, Eromanga and Murray/Darling Basins in northwestern New South Wales. In this study we use paleomagnetic and ?18O measurements to demonstrate that the weathering history dates extends back to the Permain. Paleomagnetic dating of hematitic regolith profiles yields ages for the terminal stages of deep chemical weathering, often corresponding to drying out of a profile. Previous work identified two major periods of weathering across the Australian continent during the Tertiary. This study extends the data in the eastern part of the continent, and reveals several stages of weathering from the Jurassic through to the latest Tertiary, including the two Tertiary weathering events, at ~60-30 Ma, and ~3-12 Ma. A possible Jurassic weathering episode is recorded from two sites at Cobar. A 100 Ma weathering event is recorded in samples from Cobar and the Broken Hill Region, which is a new weathering event recorded from Australian regolith samples. Clay ?18O compositions reflect the chemical makeup of groundwaters active during weathering and clay formation. There is a predictable relationship between ?18O and age of authigenic clays in regolith profiles in Australia. Clay ?18O ages from this study range from Permian through to Late Tertiary. The two oldest ages represent inheritance of some fraction of clay from the weathered host lithology. Samples from White Cliffs, Cobar and Lightning Ridge yield Oligo-Miocene ages. Another sample from the Cobar region yields a Mio-Pliocene age. The results presented provide evidence for multiple periods of deep weathering across NW NSW, from the Jurassic through the Pliocene. Clay formation in weathering profiles occurs under humid conditions, whilst hematite formation occurs at the terminal stages of intense chemical weathering, at the end of periods of humid climatic regimes. When the results are combined, they indicate periods of humid climates reaching terminal stages, resulting in deep, clay-rich, hematitic weathering profiles during several periods across NW NSW. This story adds to landscape evolution models derived from stratigraphic and geomorphological studies of surrounding basins.

Smith, M. L.; Pillans, B. J.

2005-12-01

241

Can the Metamorphic Basement of Northwestern Guatemala be Correlated with the Chuacús Complex?  

NASA Astrophysics Data System (ADS)

The Chuacús complex constitutes a northward concave metamorphic belt that stretches ca. 150 km south of the Cuilco-Chixoy-Polochic (CCP) fault system in central and central-eastern Guatemala. It represents the basement of the southern edge of the Maya block, being well exposed in the sierra de Chuacús and the sierra de Las Minas. It is composed of high-Al metapelites, amphibolites, quartzofeldspathic gneisses, and migmatites. In central Guatemala the Chuacús complex contains ubiquitous epidote-amphibolite mineral associations, and local relics of eclogite reveal a previous high-pressure metamorphic event. North of the CCP, in the Sierra de Los Cuchumatanes area of western Guatemala, metamorphic rocks have been considered the equivalent of the Chuacús complex and hence been given the name Western Chuacús group, These rocks, which were intruded by granitic rocks and later mylonitized, include chloritic schist and gneiss, biotite-garnet schist, migmatites, and amphibolites. No eclogitic relics have been found within metamorphic rocks in northwestern Guatemala. Petrographic analyses of garnet-biotite schist reveal abundant retrogression and the formation of abundant zeolite-bearing veins associated with intrusion. Although metamorphic conditions in the greenschist and amphibolite facies are similar to those in the sierra de Chuacús, the association with deformed intrusive granites is unique for western Guatemala. Hence a correlation with metasediments intruded by the Rabinal granite in the San Gabriel area of Baja Verapaz seems more feasible than a correlation with the Chuacús complex. This idea is supported by reintegration of the Cenozoic left-lateral displacement along the CCP, which would place the metamorphic basement of western Guatemala north of Baja Verapaz, adjacent to metasediments intruded by granites in the San Gabriel-Rabinal area.

Cacao, N.; Martens, U.

2007-05-01

242

Evaluating Channel Head Conditions for Environmental Impact Assessment in Northwestern Sonoma County, California  

NASA Astrophysics Data System (ADS)

Erosion and sedimentation have been identified as processes significantly affecting water quality in northern California Coast Range watersheds. These watersheds, including the Gualala River watershed in northwestern Sonoma County, have been designated as having water quality impaired by sediment under provisions of the Clean Water Act Section 303(d). A study was performed to estimate potential increases in erosion rates resulting from proposed vineyard development of ridge top forestland in the Gualala River watershed. The study area has an extensive history of logging, with substantial ground disturbance from tractors. The study area is characterized by flat ridge tops with steeply incised drainages shaped by debris slides, rock slides and earth flows. Jurassic age sedimentary and meta-sedimentary rocks of the coastal and central belt Franciscan formation comprise the underlying bedrock. Channel head development and advancement has long been understood to play a key role in sediment delivery and is possibly the most sensitive to changes in the external factors such as changes in climate or land use (Dietrich and Dunne 1993). Quantifying the amount of sediment contributed by potential channel head incision and/or initiation is an objective of environmental analysis for the project. Field surveys were performed during the field seasons of 2005 and 2006 to acquire measurements of channel head locations and slope, channel dimensions and substrate associated with the proposed development sites. Analysis of this field data, including the use of ArcGIS, allowed us to examine the local relationships between variables that influence channel initiation. Variables considered include drainage area, slope, soil type, geology and vegetation. An initial analysis of a selection of area-slope data failed to produce an inverse area-slope relationship as has been found in previous studies by Montgomery and Dietrich (1988). A more complete evaluation of the entire data set is presented here.

Sherwood, M. N.; O'Connor, M.; Pennington, R.

2007-12-01

243

Organic matter diagenesis and hydrocarbon generation on outer Continental Margin of northwestern Australia  

SciTech Connect

Organic geochemical analyses of sediments and rocks obtained from drill sites on the Exmouth and Wombat Plateaus and the Argo Abyssal Plain on the northwestern margin of Australia were done onboard the JOIDES Resolution during Ocean Drilling Program Legs 122 and 123. These analyses provide information about the sources of organic matter to these offshore locations from Triassic to Holocene times and also indicate the degree of postdepositional diagenesis and maturation the organic matter has experienced. Because this margin has interest to petroleum explorationists, these data have practical as well as fundamental significance. Triassic claystones (equivalent to the onshore Mungeroo Formation) from the Wombat Plateau contain up to several percent of land-derived organic carbon. Neocomian siltstones and claystones (equivalent to the Barrow Group and Muderong Shale) from the Exmouth Plateau hold similar organic matter but at lower concentrations. Younger sediments are generally very lean in organic matter. Gas chromatographic analysis of extractable hydrocarbons shows a large and often dominant contribution of continental components, notably n-alkanes with a strong odd/even ratio and tricyclic diterpanes. Both Rock-Eval and hydrocarbon results agree in indicating low to moderate levels of thermal maturity. Locations on the Exmouth Plateau typically contain large amounts of thermogenic gaseous hydrocarbons dominated by methane. Concentrations peak in Senonian chalk sequences. In Neocomian siltstones and claystones, methane-ethane ratios diminish as concentrations decrease. The source of these hydrocarbons is likely to be the Triassic coals and coaly material below the Dingo claystone, which was not drilled during these legs but has been characterized from industry wells on this passive margin.

Meyers, P.A.; Snowdon, L.R.; Heggie, D.; Bent, A.

1989-03-01

244

Clastic dikes of Heart Mountain fault breccia, northwestern Wyoming, and their significance  

USGS Publications Warehouse

Structural features in northwestern Wyoming indicate that the Heart Mountain fault movement was an extremely rapid, cataclysmic event that created a large volume of carbonate fault breccia derived entirely from the lower part of the upper plate. After fault movement had ceased, much of the carbonate fault breccia, here called calcibreccia, lay loose on the resulting surface of tectonic denudation. Before this unconsolidated calcibreccia could be removed by erosion, it was buried beneath a cover of Tertiary volcanic rocks: the Wapiti Formation, composed of volcanic breccia, poorly sorted volcanic breccia mudflows, and lava flows, and clearly shown in many places by inter lensing and intermixing of the calcibreccia with basal volcanic rocks. As the weight of volcanic overburden increased, the unstable water-saturated calcibreccia became mobile and semifluid and was injected upward as dikes into the overlying volcanic rocks and to a lesser extent into rocks of the upper plate. In some places the lowermost part of the volcanic overburden appears to have flowed with the calcibreccia to form dike like bodies of mixed volcanic rock and calcibreccia. One calcibreccia dike even contains carbonized wood, presumably incorporated into unconsolidated calcibreccia on the surface of tectonic denudation and covered by volcanic rocks before moving upward with the dike. Angular xenoliths of Precambrian rocks, enclosed in another calcibreccia dike and in an adjoining dikelike mass of volcanic rock as well, are believed to have been torn from the walls of a vent and incorporated into the basal part of the Wapiti Formation overlying the clastic carbonate rock on the fault surface. Subsequently, some of these xenoliths were incorporated into the calcibreccia during the process of dike intrusion. Throughout the Heart Mountain fault area, the basal part of the upper-plate blocks or masses are brecciated, irrespective of the size of the blocks, more intensely at the base and in places extending upward for several tens of meters. North of Republic Mountain a small 25-m-high upper-plate mass, brecciated to some degree throughout, apparently moved some distance along the Heart Mountain fault as brecciated rock. Calcibreccia dikes intrude upward from the underlying 2 m of fault breccia into the lower part of the mass and also from its top into the overlying volcanic rocks; an earthquake-related mechanism most likely accounts for the observed features of this deformed body. Calcibreccia dikes are more common within the bedding-plane phase of the Heart Mountain fault but also occur in its transgressive and former land-surface phases. Evidence that the Wapiti Formation almost immediately buried loose, unconsolidated fault breccia that was the source of the dike rock strongly suggests a rapid volcanic deposition over the area in which clastic dikes occur, which is at least 75 km long. Clastic dikes were injected into both the upper-plate and the volcanic rocks at about the same time, after movement on the Heart Mouuntain fault had ceased, and therefore do not indicate a fluid-flotation mechanism for the Heart Mountain fault. The difference between contacts of the clastic dikes with both indurated and unconsolidated country rock is useful in field mapping at localities where it is difficult to distinguish between volcanic rocks of the Cathedral Cliffs and Lamar River Formations, and the Wapiti Formation. Thus, calcibreccia dikes in the Cathedral Cliffs and Lamar River Formations show a sharp contact because the country rock solidified prior to fault movement, whereas calcibreccia dikes in the Wapiti Formation in many instances show a transitional or semifluid contact because the country rock was still unconsolidated or semifluid at the time of dike injection.

Pierce, W.G.

1979-01-01

245

Assessing impacts of unconventional natural gas extraction on microbial communities in headwater stream ecosystems in Northwestern Pennsylvania  

PubMed Central

Hydraulic fracturing and horizontal drilling have increased dramatically in Pennsylvania Marcellus shale formations, however the potential for major environmental impacts are still incompletely understood. High-throughput sequencing of the 16S rRNA gene was performed to characterize the microbial community structure of water, sediment, bryophyte, and biofilm samples from 26 headwater stream sites in northwestern Pennsylvania with different histories of fracking activity within Marcellus shale formations. Further, we describe the relationship between microbial community structure and environmental parameters measured. Approximately 3.2 million 16S rRNA gene sequences were retrieved from a total of 58 samples. Microbial community analyses showed significant reductions in species richness as well as evenness in sites with Marcellus shale activity. Beta diversity analyses revealed distinct microbial community structure between sites with and without Marcellus shale activity. For example, operational taxonomic units (OTUs) within the Acetobacteracea, Methylocystaceae, Acidobacteriaceae, and Phenylobacterium were greater than three log-fold more abundant in MSA+ sites as compared to MSA? sites. Further, several of these OTUs were strongly negatively correlated with pH and positively correlated with the number of wellpads in a watershed. It should be noted that many of the OTUs enriched in MSA+ sites are putative acidophilic and/or methanotrophic populations. This study revealed apparent shifts in the autochthonous microbial communities and highlighted potential members that could be responding to changing stream conditions as a result of nascent industrial activity in these aquatic ecosystems. PMID:25408683

Trexler, Ryan; Solomon, Caroline; Brislawn, Colin J.; Wright, Justin R.; Rosenberger, Abigail; McClure, Erin E.; Grube, Alyssa M.; Peterson, Mark P.; Keddache, Mehdi; Mason, Olivia U.; Hazen, Terry C.; Grant, Christopher J.; Lamendella, Regina

2014-01-01

246

Assessing impacts of unconventional natural gas extraction on microbial communities in headwater stream ecosystems in Northwestern Pennsylvania.  

PubMed

Hydraulic fracturing and horizontal drilling have increased dramatically in Pennsylvania Marcellus shale formations, however the potential for major environmental impacts are still incompletely understood. High-throughput sequencing of the 16S rRNA gene was performed to characterize the microbial community structure of water, sediment, bryophyte, and biofilm samples from 26 headwater stream sites in northwestern Pennsylvania with different histories of fracking activity within Marcellus shale formations. Further, we describe the relationship between microbial community structure and environmental parameters measured. Approximately 3.2 million 16S rRNA gene sequences were retrieved from a total of 58 samples. Microbial community analyses showed significant reductions in species richness as well as evenness in sites with Marcellus shale activity. Beta diversity analyses revealed distinct microbial community structure between sites with and without Marcellus shale activity. For example, operational taxonomic units (OTUs) within the Acetobacteracea, Methylocystaceae, Acidobacteriaceae, and Phenylobacterium were greater than three log-fold more abundant in MSA+ sites as compared to MSA- sites. Further, several of these OTUs were strongly negatively correlated with pH and positively correlated with the number of wellpads in a watershed. It should be noted that many of the OTUs enriched in MSA+ sites are putative acidophilic and/or methanotrophic populations. This study revealed apparent shifts in the autochthonous microbial communities and highlighted potential members that could be responding to changing stream conditions as a result of nascent industrial activity in these aquatic ecosystems. PMID:25408683

Trexler, Ryan; Solomon, Caroline; Brislawn, Colin J; Wright, Justin R; Rosenberger, Abigail; McClure, Erin E; Grube, Alyssa M; Peterson, Mark P; Keddache, Mehdi; Mason, Olivia U; Hazen, Terry C; Grant, Christopher J; Lamendella, Regina

2014-01-01

247

Geology and geochemistry of the clastic sequences from Northwestern Panay (Philippines): Implications for provenance and geotectonic setting  

Microsoft Academic Search

Whole-rock geochemical analysis of samples from the clastic sequences in Northwestern Panay revealed different compositional ranges for the Buruanga Peninsula and Antique Range. The results provide additional evidence that Northwestern Panay consists of two distinct terranes as a result of the arc-continent collision between the Palawan Microcontinental Block and the Philippine Mobile Belt. Major element compositions of clastic rocks from

Jillian Aira S. Gabo; Carla B. Dimalanta; Mary Grace S. Asio; Karlo L. Queaño; Graciano P. Yumul Jr.; Akira Imai

2009-01-01

248

Mobility of palladium in the surface environment: data from a regional lake sediment survey in northwestern Ontario  

E-print Network

in northwestern Ontario Eion M. Cameron1 & Kéiko H. Hattori2 1 Eion Cameron Geochemical Inc., 865 Spruce Ridge Road, Carp, Ontario, Canada, K0A 1L0 (e-mail: eioncam@attglobal.net) 2 Department of Earth Sciences part of a project to examine geochemical methods in exploration for Pd deposits in northwestern Ontario

249

Experimental evidence that oral secretions of northwestern ring-necked snakes ( Diadophis punctatus occidentalis) are toxic to their prey  

Microsoft Academic Search

Ring-necked snakes (Diadophis punctatus) are suspected of being venomous because their Duvernoy's gland secretions have high levels of phospholipase activity, which is characteristic of many viperid and elapid venoms, and because anecdotal reports of feeding behavior are consistent with the use of a venom. We tested the toxicity of northwestern ring-necked snake oral secretions to a natural prey species, northwestern

Ryan P. O’Donnell; Kevin Staniland; Robert T. Mason

2007-01-01

250

Upper Cretaceous source rocks of northern and northwestern South America  

SciTech Connect

Organic carbon-rich, laminated, calcareous shales and limestones of Cenomanian to Campanian age are widespread in the polyhistory basins of Venezuela, Colombia, and Trinidad and are identified as the most important oil-generating source rocks in these basins. Available data on sedimentological, geochemical, and organic petrographic characteristics demonstrate that these source rocks are characterized by predominantly marine organic matter deposited in anoxic to near-anoxic marine environments. Marine transgressions due to eustatic sea level rise, with consequent flooding of available shelves of the northern and northwestern passive margin of the Cretaceous South American continent and resulting upwelling conditions, appears to be the key geologic control for the deposition of these laterally extensive source rocks. Significant vertical variations in geochemical properties are observed. These variations were caused by temporal changes in the influx of terrestrial organic matter and/or alternations of relatively oxic and anoxic conditions. Regional variations in organic carbon content, organic matter type, and oil potential broadly reflect the paleogeographic setting of the Cretaceous continental margin. The regionally extensive oil-prone source rocks became largely mature for hydrocarbon generation during the Tertiary, consequent to the development of the individual polyhistory basins. Rock-Eval pyrolysis data from several samples and results from hydrous pyrolysis experiments on some selected immature samples from the Venezuelan basins are used to define the oil-generating capacity, and kinetic parameters obtained from Rock-Eval experiments on the same samples are considered to outline the oil generation under the geological heating rates encountered in the sedimentary basins.

Talukdar, S.; Gallango, O.; Cassani, F.; Vallejos, C.

1989-03-01

251

The earliest evidence for anatomically modern humans in northwestern Europe.  

PubMed

The earliest anatomically modern humans in Europe are thought to have appeared around 43,000-42,000 calendar years before present (43-42 kyr cal BP), by association with Aurignacian sites and lithic assemblages assumed to have been made by modern humans rather than by Neanderthals. However, the actual physical evidence for modern humans is extremely rare, and direct dates reach no farther back than about 41-39 kyr cal BP, leaving a gap. Here we show, using stratigraphic, chronological and archaeological data, that a fragment of human maxilla from the Kent's Cavern site, UK, dates to the earlier period. The maxilla (KC4), which was excavated in 1927, was initially diagnosed as Upper Palaeolithic modern human. In 1989, it was directly radiocarbon dated by accelerator mass spectrometry to 36.4-34.7 kyr cal BP. Using a Bayesian analysis of new ultrafiltered bone collagen dates in an ordered stratigraphic sequence at the site, we show that this date is a considerable underestimate. Instead, KC4 dates to 44.2-41.5 kyr cal BP. This makes it older than any other equivalently dated modern human specimen and directly contemporary with the latest European Neanderthals, thus making its taxonomic attribution crucial. We also show that in 13 dental traits KC4 possesses modern human rather than Neanderthal characteristics; three other traits show Neanderthal affinities and a further seven are ambiguous. KC4 therefore represents the oldest known anatomically modern human fossil in northwestern Europe, fills a key gap between the earliest dated Aurignacian remains and the earliest human skeletal remains, and demonstrates the wide and rapid dispersal of early modern humans across Europe more than 40 kyr ago. PMID:22048314

Higham, Tom; Compton, Tim; Stringer, Chris; Jacobi, Roger; Shapiro, Beth; Trinkaus, Erik; Chandler, Barry; Gröning, Flora; Collins, Chris; Hillson, Simon; O'Higgins, Paul; FitzGerald, Charles; Fagan, Michael

2011-11-24

252

Distribution of the Late-Quaternary deformation in Northwestern Himalaya  

NASA Astrophysics Data System (ADS)

Three main Cenozoic thrusts at the front of Northwestern Himalaya have accommodated most of the India-Eurasia convergence across the belt over the last million years and produced the present relief. Their recent tectonic activity is poorly known because of the long period of inaccessibility of the Jammu and Kashmir state, and because the latest and only large earthquake recorded in the region occurred in 1555 AD. We show where the deformation is localized during the Late-Quaternary, and determine shortening rates across the structures by analyzing the geometry and chronology of geomorphic markers. The Main Boundary Thrust in this region ceased moving at least ?30 ka ago. On the contrary, the more external Medlicott-Wadia Thrust and Main Frontal Thrust, both merging at depth on the sub-flat detachment of the Main Himalayan Thrust, exhibit hectometric-scale deformations accumulated during the last thousands of years. The total shortening rate absorbed by these faults over the last 14-24 ka is between 13.2 and 27.2 mm/yr (11.2 ± 3.8 and 9.0 ± 3.2 mm /yr, respectively). Part of this deformation may be associated to the geometry of the Chenab reentrant, which could generate an extra oblique component. However, the lower bound of our shortening rates is consistent with previously determined geodetic rates. Active deformation on these structures follows an in-sequence/out-of-sequence pattern, with breaking of both ramps being possible for earthquakes triggered on the main detachment.

Vassallo, R.; Mugnier, J.-L.; Vignon, V.; Malik, M. A.; Jayangondaperumal, R.; Srivastava, P.; Jouanne, F.; Carcaillet, J.

2015-02-01

253

Acritarchs and microfossils from the Mesoproterozoic Bangemall Group, northwestern Australia.  

PubMed

Three microfossil assemblages occur in the Mesoproterozoic Bangemall Group (1625-1000 Ma) of northwestern Australia, each occupying a different environmental and taphonomic setting. In peritidal environments, benthic prokaryotic filaments and spheroids of matting habit and small size were permineralized by early diagenetic silicification of stromatolitic carbonates. In shallow subtidal environments, benthic filaments of large size and nonmatting habit and planktonic sphaeromorph acritarchs with thin walls and moderate dimensions were compressed in mildly kerogenous shale. In deeper subtidal environments, planktonic megasphaeromorph acritarchs with thick walls were initially entombed in concretionary nodules in highly kerogenous shale and then permineralized by silica during later diagenesis. Taxonomic diversity and numerical abundance evidently decrease offshore. The three assemblages have typical Mesoproterozoic aspects: peritidal benthic habitats were dominated by Siphonophycus-Sphaerophycus-Eosynechococcus-Myxococcoides-Palaeopleurocapsa, shallow subtidal settings were occupied by Siphonophycus-Leiosphaeridia-Pterosphermopsimorpha-Satka, and offshore plankton consisted solely of very large chuarid acritarchs. Because of its taphonomic restriction to mid-intertidal stromatolites, the peritidal assemblage can be equated in microenvironment with a similar assemblage in the Neoproterozoic Draken Conglomerate, suggesting that ecological stasis at the community level can last for intervals up to 900 million years. In the deeper subtidal assemblage, the common chuarid has an unusual mode of preservation, in three dimensions in early diagenetic concretions, revealing that it possesses a thick multilamellate wall. Because of this distinctive ultrastructure, the new genus Crassicorium is erected for these fossils, which are among the oldest indubitable eukaryotes. Very large (34-55 micrometers in diameter) filaments from shallow subtidal habitats are assigned to the emended species Siphonophycus punctatum. PMID:11543499

Buick, R; Knoll, A H

1999-09-01

254

Benthic-Pelagic coupling in the Black Sea northwestern shelf  

NASA Astrophysics Data System (ADS)

A new approach for modeling the benthic compartment in 3D ocean models is applied to analyze the benthic-pelagic coupling in the Black Sea northwestern shelf (BS-NWS) and to review the contribution of sedimentary diagenesis to the BS-NWS biogeochemical cycles (nitrogen, oxygen and carbon). This approach combines an explicit representation of sediment organic matter deposition and resuspension, controlled by the bottom shear stress, and a parameterization of mineralization pathways control by bottom environmental properties. The model reproduces the magnitude and inter-regional and seasonal variability depicted by in situ benthic fluxes estimates obtained by benthic chambers and sediment cores incubations. The model illustrates how this observed variability results from both variable sedimentation rate and variable diagenetic pathways in the sediment layer. Three distinct areas are identified based on the analysis of the simulated seasonal cycle of bottom environmental conditions, benthic-pelagic fluxes and diagenetic processes. These areas extend along a gradient from the land-ocean interface to the open sea boundary and are each characterized by a particular diagenetic pathway, in a way similar as they succeed vertically in a sediment profile. (1) In the hypoxic zone, high remineralization rates lead to a seasonal peak in anoxic diagenesis and under certain conditions to hydrogen sulphide effluxes from the sediment, (2) in the denitrification zone, benthic denitrification rates are maximal and (3) in the oxic zone, where organic matter accumulation are low, oxic diagenesis prevails and seasonality is less marked. This study underlines that representing resuspension and deposition processes in coupled benthic-pelagic models is essential to realistically describe the horizontal distribution of benthic-pelagic fluxes and the export from the shelf region to the deep sea.

Capet, Arthur; Akoumianaki, Ionna; Meysman, Filip; Soetaert, Karline; Grégoire, Marilaure

2014-05-01

255

Rabies surveillance in bats in Northwestern State of São Paulo.  

PubMed

Introduction Rabies is an important zoonosis that occurs in mammals, with bats acting as Lyssavirus reservoirs in urban, rural and natural areas. Rabies cases in bats have been recorded primarily in urban areas in Northwestern State of São Paulo since 1998. This study investigated the circulation of rabies virus by seeking to identify the virus in the brain in several species of bats in this region and by measuring rabies-virus neutralizing antibody levels in the hematophagous bat Desmodus rotundus. Methods From 2008 to 2012, 1,490 bat brain samples were sent to the Universidade Estadual Paulista (UNESP) Rabies Laboratory in Araçatuba, and 125 serum samples from vampire bats that were captured in this geographical region were analyzed. Results Rabies virus was detected in the brains of 26 (2%) of 1,314 non-hematophagous bats using the fluorescent antibody test (FAT) and the mouse inoculation test (MIT). None of the 176 hematophagous bat samples were positive for rabies virus when a virus detection test was utilized. Out of 125 vampire bat serum samples, 9 (7%) had levels of rabies virus neutralization antibodies (RVNAs) that were higher than 0.5IU/mL; 65% (81/125) had titers between 0.10IU/mL and 0.5IU/mL; and 28% (35/125) were negative for RVNAs using the simplified fluorescent inhibition microtest (SFIMT) in BHK21 cells. The observed positivity rate (1.7%) was higher than the average positivity rate of 1.3% that was previously found in this region. Conclusions The high percentage of vampire bats with neutralizing antibodies suggests that recent rabies virus exposure has occurred, indicating the necessity of surveillance measures in nearby regions that are at risk to avoid diffusion of the rabies virus and possible rabies occurrences. PMID:25626649

Casagrande, Daiene Karina Azevedo; Favaro, Ana Beatriz Botto de Barros da Cruz; Carvalho, Cristiano de; Picolo, Mileia Ricci; Hernandez, Janaína Camila Borges; Lot, Monique Serra; Albas, Avelino; Araújo, Danielle Bastos; André Pedro, Wagner; Queiroz, Luzia Helena

2014-12-01

256

Reclamation studies on oil shale lands in northwestern Colorado  

SciTech Connect

The overall objective of this project is to study the effects of various reclamation practices on above- and belowground ecosystem development associated with disturbed oil shale lands in northwestern Colorado. Plant growth media that are being used in field test plots include retorted shale, soil over retorted shale, subsoil materials, and surface disturbed topsoils. Some of the more significant results are: (1) a soil cover of at least 61 cm in conjunction with a capiallary barrier provided the best combination of treatments for the establishment of vegetation and a functional microbial community, (2) aboveground production values for native and introduced species mixtures are comparable after three growing seasons, (3) cover values for native species mixtures are generally greater than for introduced species, (4) native seed mixtures, in general, allow greater invasion to occur, (5) sewage sludge at relatively low rates appears to provide the most beneficial overall effect on plant growth, (6) cultural practices, such as irrigated and mulching have significant effects on both above- and belowground ecosystem development, (7) topsoil storage after 1.5 years does not appear to significantly affect general microbial activities but does reduce the mycorrhizal infection potential of the soil at shallow depths, (8) populations of mycorrhizal fungi are decreased on severely disturbed soils if a cover of vegetation is not established, (9) significant biological differences among ecotypes of important shrub species have been identified, (10) a vegetation model is outlined which upon completion will enable the reclamation specialist to predict the plant species combinations best adapted to specific reclamation sites, and (11) synthetic strains of two important grass species are close to development which will provide superior plant materials for reclamation in the West.

Cook, C.W.; Redente, E.F.

1980-02-01

257

Comparative phylogeography in marginal seas of the northwestern Pacific.  

PubMed

The maturation of marine phylogeography depends on integration of comparative information across different regions globally. The northwestern Pacific, characterized by unique tectonic setting, however, is still underrepresented. This study seeks to highlight its phylogeographical history based on the available population data, focusing on three seas: the East China Sea (ECS), the South China Sea (SCS) and the Sea of Japan (SOJ). We first conducted a literature survey to evaluate current research efforts and then reanalysed the population structure, historical demography and genealogy for two selections of studies (namely ‘the ECS category’ and ‘the multiple-sea category’) to elucidate the evolutionary processes within and across the seas, respectively. For the ECS category, the meta-analyses revealed most studies displayed a shallow phylogeny, indicating a single origin from the sea. Significant population structure was commonplace, particularly in molluck and crustacean studies, with proportions of 89% and 80%, respectively. Nearly all studies selected showed signals of population expansion: the times estimated were closely linked to a period of ~120-140 Kya rather than the last glacial maximum. For the latter category, divergent intraspecific lineages appeared among seas and overlapped in the adjacent regions, a pattern implying each sea had served as an independent refugium during glaciations. The genetic splits, however, were estimated to arise from separate events dating from late Miocene to middle Pleistocene. As phylogeography is still in its infancy in the region, more effort is needed to test and complement the general rules abstracted here. Finally, challenges and prospects were discussed to accelerate further research. PMID:24600706

Ni, Gang; Li, Qi; Kong, Lingfeng; Yu, Hong

2014-02-01

258

Pedogenesis and Permafrost Carbon Over the Eboling Ridge in Heihe River Basin, Northwestern China  

NASA Astrophysics Data System (ADS)

Based on field permafrost sampling and laboratory analysis, we found that the average storages of soil organic carbon (SOC), total nitrogen (TN) and soil inorganic carbon (SIC) in permafrost soils were much more than that in the active layer on the Eboling Mountain in the upper reach of Heihe River basin, northwestern China. The objective of this study is to better understand the main soil physicochemical parameters influencing C and N dynamics in permafrost regions of northwestern China. Specifically, we investigated the effect of pedogenesis, cryogenic structure and SIC on SOC, TN and water-soluble organic carbon (WSOC) in the permafrost regions. The preliminary results show that SIC is a significant factor influencing carbon flux between atmosphere and terrestrial ecosystem and the distribution patterns of SOC and N. There are high correlation between SIC, SOC and N in permafrost. SOC and SIC can interact with each other, their small change may radically alter the carbon balance. SIC as a major factor will be crucial for developing large scale models evaluating C and N dynamics. High contents of C and N combined with a low vertical variability in each horizon on the Eboling Mountain can be explained by longer duration of pedogenesis and the influence of permafrost. In permafrost regions, the vertical distribution of soil C and N is also influenced by soil cryogenic structure. The high content of WSOC in deep permafrost soils can be explained by the formation of the ground ice causes the WSOC enrichment followed moisture migration. The average WSOC content in permafrost soils was larger than that in the active layer, suggesting that the labile carbon in permafrost soils has higher quality. SIC can reflect the microbial activity indirectly, due to the good negative relationship between SIC, soil pH and C/N ratios in permafrost. Soil pH values were the important factor influencing the distribution of SIC in deep permafrost soils. SIC in permafrost soils was controlled by acidification and other processes depending on soil pH. Microbial activity may be lower in soils with more acidic pH than in soils at circumneutral and alkaline pH, due to less soluble dissolved organic matter. The effect of geochemical variation in permafrost soils on microbial activity and SOM decomposition rates needs more research. The degradation of permafrost and ground ice melting with permafrost temperature increase on the Eboling Mountain would have severe impact on soil C and available N, which may alter the ecosystems function in arid and semiarid regions. However, in the long term, the growth of vegetation can enhance due to growing season extending, precipitation increasing and temperature increase, which may cause more atmospheric carbon into plants and soils through the photosynthesis. Therefore, the response of permafrost degradation in arid and semi-arid regions to future climate, ecology and landscapes needs more experimental and modeling studies.

Mu, C.; Zhang, T.; Cao, B.; Wang, Q.; Peng, X.; Cheng, G.

2013-12-01

259

Late quaternary pollen records from the Kobuk and Noatak river drainages, northwestern Alaska  

NASA Astrophysics Data System (ADS)

Pollen diagrams from Joe and Niliq Lakes date to ca. 28,000 and 14,000 yr B.P., respectively. Mesic shurb tundra grew near Joe Lake ca. 28,000 to 26,000 yr B.P. with local Populus populations prior to ca. 27,000 yr B.P. Shrub communities decreased as climate changed with the onset of Itkillik II glaciation (25,000 to 11,500 yr B.P.), and graminoid-dominated tundra characterized vegetation ca. 18,500 to 13,500 yr B.P. Herb tundra was replaced by shrub Betula tundra near both sites ca. 13,500 yr B.P. with local expansion of Populus ca. 11,000 to 10,000 yr B.P. and Alnus ca. 9000 yr B.P. Mixed Picea glauca/P. mariana woodland was established near Joe Lake ca. 6000 yr B.P. These pollen records when combined with others from northern Alaska and northwestern Canada indicate (1) mesic tundra was more common in northwestern Alaska than in northeastern Alaska or northwestern Canada during the Duvanny Yar glacial interval (25,000 to 14,000 yr B.P.); (2) with deglaciation, shrub Betula expanded rapidly in northwestern Alaska but slowly in areas farther east; (3) an early postglacial thermal maximum occurred in northwestern Alaska but had only limited effect on vegetation; and (4) pollen patterns in northern Alaska and northwestern Canada suggest regional differences in late Quaternary climates.

Anderson, Patricia M.

1988-05-01

260

Geology of the central Roan Plateau area, northwestern Colorado  

SciTech Connect

The geology of the central Roam Plateau area in the south-central part of the Piceance Creek basin, comprising four 7.5-minute quadrangles, is described. Subsurface rocks penetrated by drill holes include the Mancos Shale and Mesaverde Formation of Later Cretaceous age, and parts of the Wasatch Formation of Paleocene and Eocene age, and Green River Formation of Eocene age. Exposed rocks, aggregating as much as 4,550 feet in thickness, are all Eocene in age and include the upper part of the Wasatch Formation , and the Green River and Uinta formations. The Green River and Uinta formations are extensively intertongued. Surficial deposits of Quaternary age include alluvium, talus, slopewash, and landslides. Two northwesterly trending folds, the Clear Creek Syncline and the Crystal Creek anticlinal nose, are present in the northern part of the area. There are no major faults. The area contains large potentially important oil-shale resources, mostly in the Parachute Creek member of the Green River Formation.

Hail, W.J. Jr.

1992-01-01

261

Deformation of Northwestern South America from GPS Geodesy  

NASA Astrophysics Data System (ADS)

The North Andes block (NAB) is a hypothesized tectonic block that migrates (escapes) north-northeast relative to a stable South American reference frame. The motion of this block is thought-to-be derived by the collision of the Carnegie Ridge in southern Ecuador and/or by oblique convergence and high degrees of interplate coupling north of the ridge (i.e., strain partitioning). At the latitude of Ecuador, the NAB is defined by transpressional deformation accommodating east-northeastward motion along its boundary with South America. In southern to central Colombia, the NAB is dissected by several mapped and prominent regional shear zones. At these latitudes the NAB may be bound to the west by the Choco block and the transpressional Atrato-Uraba fault system and to the east by the Guayaquil-Algeciras fault system. And in northern Colombia the Caribbean - South America plate boundary is defined by the NAB and proposed Maracaibo and Guajira blocks. We investigate the deformation of northwestern South America, including the kinematics of NAB utilizing a new velocity field based on continuous GPS and existing episodic GPS data in Ecuador, Colombia, Venezuela and Panama. We reference these new velocities to a newly estimated Euler vector for the South America plate based on inversion of cGPS data from stations east of the Andes. The new velocity field and published earthquake slip vectors are inverted to solve for the Euler vectors of the NAB, Choco, Panama, Maracaibo and Guajira blocks and interseismic elastic strain accumulation (interseismic coupling) on block-bounding faults using a block modeling approach. We test a suite of block models to investigate the tectonic nature of the NAB along strike and the style of faulting in the upper plate accommodating block motion. Through the estimation of elastic strain accumulation on all block-bounding faults, we improve the understanding of interseismic coupling along a convergent margin capable of producing M>8 earthquakes and faults in the upper plate capable of generating M>6 earthquakes.

Mora-Paez, H.; La Femina, P. C.; Mothes, P. A.; Ruiz, A. G.; Fernandes, R. M.

2013-12-01

262

Molecular identification of Theileria parasites of northwestern Chinese Cervidae  

PubMed Central

Background Theileria and Babesia protozoan parasites are transmitted mainly by tick vectors. These parasites cause heavy economic losses to the live-stock industry, as well as affecting the health of wild animals in parasite-endemic areas. Identification of infectious agents in wild animals is not only crucial for species preservation, but also provides valuable information on parasite epidemiology. Here, we conducted a molecular surveillance study in Northwestern China to assess the prevalence of blood pathogens in cervids. Methods PCR analysis and microscopic evaluation of blood smears to detect Theileria- and Babesia-related diseases in Cervidae were conducted, in which 22 blood samples from red deer (n?=?22) in Qilian Mountain and 20 from sika deer (n?=?20) in Long Mountain were collected and tested for the presence of Theileria and Babesia. The 18S rRNA gene was amplified, and selected polymerase chain reaction (PCR)-positive samples were sequenced for species identification. Results PCR revealed that 9.1% of the Qilian Mountain samples and 20% of the Long Mountain samples were positive for Theileria uilenbergi; 90.09% of the Qilian Mountain samples (n?=?22) were positive for T. capreoli, but all of the Long Mountain samples (n?=?20) were negative for T. capreoli; no other Theileria or Babesia species were found. PCR showed that T. uilenbergi and T. capreoli were present in red deer in Qilian Mountain, while only T. uilenbergi was found in sika Deer in Long Mountain. The 18S rRNA gene sequences were aligned against the corresponding GenBank sequences of known isolates of Theileria and Babesia and subjected to phylogenetic analysis. The phylogenetic tree showed that the newly isolated Theileria spp. could be classified as belonging to two clades: one group belonged to the same clade as T. uilenbergi, the other to a clade containing T. capreoli. Conclusions Our results provide important data to increase understanding of the epidemiology of Cervidae theileriosis, and will assist with the implementation of measures to control theileriosis transmission to Cervidae and small ruminants in central China. PMID:24885179

2014-01-01

263

Epidemiology of pleural mesothelioma in North-western Italy (Piedmont)  

PubMed Central

Rubino, G. F., Scansetti, G., Donna, A., and Palestro, G. (1972).Brit. J. industr. Med.,29, 436-442. Epidemiology of pleural mesothelioma in North-western Italy (Piedmont). Fifty-four cases of mesothelioma of the pleura admitted to the Chest Surgery Centre or to the Department of Medicine of the University of Turin from 1960 to 1970 are reported. Thoracotomy was performed in 22. In the other 32 the diagnosis was based on the clinical, radiographic, and cytological findings and on the results of biopsy. In 50 cases (18 women and 32 men), the majority of whom had always or mostly lived in Piedmont, it was possible to ascertain the family history, previous residence, and occupation, mainly with the aid of information given by the patient's relatives. A similar investigation was made by the same interviewers into 50 other patients of the same sex and age admitted to the same institutions, using an identical technique. In the group with mesothelioma (only two of whom survived more than two years after the diagnosis had been made) occupational exposure to asbestos was demonstrated unequivocally in five men. Three other patients, including one woman, had lived with persons employed in the asbestos industry (16%). Exposure for occupational reasons seemed very likely in another patient, who had been a fireman in the Turin Arsenal for 40 years. One man in the control group had worked for two years in a cement-asbestos manufacturing company (2%). A re-appraisal of the histological sections and examination of new preparations made in the 22 cases operated on was done in the Department of Pathological Anatomy of the University of Turin, also with the purpose of confirming the diagnosis. This re-appraisal revealed the presence of asbestos bodies in the mesothelioma in one case, a woman who had never been exposed to asbestos for occupational or domestic reasons but who had always lived in one of the two regions of the Province of Turin with the highest number of asbestos industries. Images PMID:4636663

Rubino, G. F.; Scansetti, G.; Donna, A.; Palestro, G.

1972-01-01

264

A deep water turbidity origin for the Altuda Formation (Capitanian, Permian), Northwest Glass Mountains, Texas  

USGS Publications Warehouse

The Altuda Formation (Capitanian) in the northwestern Glass Mountains is comprised of thin, even bedded limestones, dolostones, mixed clastic-carbonates, and silt/sandstones interbedded with basin-ward dipping wedge-shaped clinoforms of the Captian Limestone. The formation is characterized by graded bedding, planar laminations, flame structures, contorted/convolute bedding, horizontal branching burrows, and shelf-derived normal marine fauna. A detailed study of the Altuda Formation north of Old Blue Mountain, Glass Mountains, reveals that the formation in this area was deposited by turbidity currents in slope to basinal settings.

Haneef, Mohammad; Rohr, D.M.; Wardlaw, B.R.

2000-01-01

265

DISTRIBUTION OF NATURALIZED CARDUUS NUTANS (COMPOSITAE) MAPPED IN RELATION TO GEOLOGY IN NORTHWESTERN OHIO12  

Microsoft Academic Search

Within recent years the nodding thistle or musk thistle (Carduus nutans L.) has be- come naturalized and abundant in northwestern Ohio in at least two areas, the Castalia- Bellevue-Sandusky area and the Carey area. In the summers of 1967 and 1968, the total detailed distribution of Carduus nutans in these two areas was mapped by noting its occur- rence and

RONALD L. STUCKEY; JANE L. FORSYTH

266

Food habits of the Broad?snouted Caiman (Caiman latirostris: Crocodylia, Alligatoridae) in northwestern Uruguay  

Microsoft Academic Search

The food habits of the Broad?snouted Caiman (Caiman latirostris) were studied in northwestern Uruguay. The most common prey were insects, the shrimp Pseudopalaemon bouvieri, the snail Pomacea canaliculata, fish and birds. Spiders, crabs, amphibians, snakes, turtles and mammals were consumed less frequently. Arthropods were the most frequent prey for juvenile caiman. Fish and snails were consumed by all size classes.

C. Borteiro; F. Gutiérrez; M. Tedros; F. Kolenc

2009-01-01

267

BIOMEDICAL ENGINEERING AT NORTHWESTERN Christina Enroth-Cugell, Lyle F. Mockros, and Robert A. Linsenmeier  

E-print Network

BIOMEDICAL ENGINEERING AT NORTHWESTERN 1969-1999 Christina Enroth-Cugell, Lyle F. Mockros, and Robert A. Linsenmeier The seeds for biomedical engineering were planted in the 1950s by the pioneering. In the beginning of the 1960's the University administration had supported biomedical engineering in the form

MacIver, Malcolm A.

268

Aerodynamic properties of agricultural and natural surfaces in northwestern Tarim Basin  

Technology Transfer Automated Retrieval System (TEKTRAN)

Friction velocity (u*) and aerodynamic roughness (z0) are important parameters that influence soil erosion, but no attempts have been made to quantify these parameters as affected by different land use types in the northwestern Tarim Basin. Wind velocity profiles were measured and used to determine ...

269

Evaluating Channel Head Conditions for Environmental Impact Assessment in Northwestern Sonoma County, California  

Microsoft Academic Search

Erosion and sedimentation have been identified as processes significantly affecting water quality in northern California Coast Range watersheds. These watersheds, including the Gualala River watershed in northwestern Sonoma County, have been designated as having water quality impaired by sediment under provisions of the Clean Water Act Section 303(d). A study was performed to estimate potential increases in erosion rates resulting

M. N. Sherwood; M. O'Connor; R. Pennington

2007-01-01

270

A three-dimensional numerical simulation of Typhoon Holly in the northwestern Pacific Ocean  

Microsoft Academic Search

A three-dimensional primitive equation model (the Princeton Ocean Model, often called POM) has been implemented for simulating Typhoon Holly generated in the tropical Pacific Ocean. This is the first time that a study of this type, previously used mostly for coastal, regional simulations, has been implemented for the northwestern Pacific Ocean, from 24°N to 52°N, including the East China Sea,

Chul-Hoon Hong; Jong-Hwan Yoon

2003-01-01

271

BREEDING BIOLOGY OF THE GREAT GRAY OWL IN SOUTHEASTERN IDAHO AND NORTHWESTERN WYOMING  

Microsoft Academic Search

In this study, I documented the existence of a breeding population of Great Gray Owls (Strix nebulosa) in southeastern Idaho and northwestern Wyoming and recorded aspects of this species' breeding biology between 1980 and 1983. Thirty-eight pairs were found; 25 fledged young at least once. Fifteen nests were documented; 40% in old stick nests and 60% on tops of broken-top

ALAN B. FRANKLIN

272

Aspects of the ecology of coastal tundra raised beach ridges in Northwestern Ontario  

Microsoft Academic Search

The structure of lichen dominated vegetation is described within a series of raised beach ridges found along the strip of coastal tundra in northwestern Ontario. The patterns of distribution of the most abundant species correlated with the topographic influences of individual beach ridges more than with the influences of the general developmental sequence of vegetation from the coast of Hudson

Douglas William Larson

1975-01-01

273

Regulation, cross-border trade and practical norms in West Nile, north-western Uganda  

Microsoft Academic Search

:This article describes how cross-border trade in West Nile, north-western Uganda to a large extent takes place outside of the legal framework. This does not mean that this trade is unregulated. We make use of the concept of 'practical norms' to show the existence of regulation within this trade, which diverges both from official norms and social norms ('moral economy').

Tom de Herdt; Kristof Titeca

2010-01-01

274

Mantle flow beneath northwestern Venezuela: Seismic evidence for a deep origin of the Mrida Andes  

E-print Network

Mantle flow beneath northwestern Venezuela: Seismic evidence for a deep origin of the Mérida Andes University, Houston, TX, USA b Fundación de Investigaciones Simológicas (FUNVISIS), Caracas, Venezuela a b wave splitting from SKS data recorded by the national seismic network of Venezuela and a linear

Niu, Fenglin

275

Lake Evolution in the Tengger Desert, Northwestern China, during the Last 40,000 Years  

Microsoft Academic Search

Climatic changes inferred from lacustrine deposits and lake-level fluctuations in northwestern and central China are mainly based on paleoclimatic records from the Tibetan Plateau, while there is still a lack of data relating to the semiarid\\/arid desert regions of Inner Mongolia. In the Tengger Desert, different paleolake levels at Baijian Hu are documented by six paleoshorelines and stratified lake carbonates.

Hans-Joachim Pachur; Bernd Wünnemann; Hucai Zhang

1995-01-01

276

Estimates of lobster-handling mortality associated with the Northwestern Hawaiian  

E-print Network

128 Estimates of lobster-handling mortality associated with the Northwestern Hawaiian Islands lobster-trap fishery Gerard T. DiNardo Edward E. DeMartini Honolulu Laboratory, Southwest Fisheries Honolulu, Hawaii 96822 The commercial lobster fishery in the which are close to the sizes at first ma

277

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA  

E-print Network

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA Heather L- icals have been presumed minimal. To determine the factors controlling transport of nitrate irrigation well. Nitrate was detected within 4.4 m of the water table but was absent in deeper waters

278

NORTHWESTERN LAKES OF THE UNITED STATES: BIO-LOGICAL AND CHEMICAL STUDIES WITH REFERENCE  

E-print Network

NORTHWESTERN LAKES OF THE UNITED STATES: BIO- LOGICAL AND CHEMICAL STUDIES WITH REFERENCE . Calculations of carbon dioxide. Complete analyses of water of five im- portant lakes . Net plankton . Method of obtaining and enumerating.. Physical conditions in lakes·....·.... Thermal changes and gas condi- tions

279

Biogeographic relationships of Pliocene and Pleistocene North-western African Mammals Denis GERAADS  

E-print Network

1 Biogeographic relationships of Pliocene and Pleistocene North-western African Mammals Denis mammals shows that these biogeographic domains cannot simply be extrapolated to the late Cenozoic of northern influence among large mammals, although several small mammals had a wide range

Paris-Sud XI, Université de

280

Evaluation of MODIS derived perpendicular drought index for estimation of surface dryness over northwestern China  

Microsoft Academic Search

In this paper, drought status of northwestern China is evaluated using the Terra–Moderate Resolution Imaging Spectroradiometer (MODIS) data with a newly developed method called perpendicular drought index (PDI), which is defined as a line segment that is parallel with the soil line and perpendicular to the normal line of soil line intersecting the coordinate origin in the two?dimensional scatter plot

Q. Qin; A. Ghulam; L. Zhu; L. Wang; J. Li; P. Nan

2008-01-01

281

Late quaternary vegetational change in the Kotzebue sound area, northwestern Alaska  

SciTech Connect

Two sediment cores from Kaiyak and Squirrel lakes in northwestern Alaska yielded pollen records that date to ca. 39,000 and 27,000 yr B.P., respectively. Between 39,000 and 14,000 yr B.P., the vegetation around these lakes was dominated by Gramineae and Cyperaceae with some Salix and possibly Betula nana/glandulosa forming a local, shrub component of the vegetation. Betula pollen percentages increased about 14,000 yr B.P., indicating the presence of a birch-dominated shrub tundra. Alnus pollen appeared at both sites between 9000 and 8000 yr B.P., and Picea pollen (mostly P. mariana) arrived at Squirrel Lake about 5000 yr B.P. The current forest-tundra mosaic around Squirrel Lake was established at this time, whereas shrub tundra existed near Kaiyak Lake throughout the Holocene. When compared to other pollen records from northwestern North America, these cores (1) represent a meadow component of lowland, Beringian tundra between 39,000 and 14,000 yr B.P., (2) demonstrate an early Holocene arrival of Alnus in northwestern Alaska that predates most other Alnus horizons in northern Alaska or northwestern Canada, and (3) show an east-to-west migration of Picea across northern Alaska from 9000 to 5000 yr B.P.

Anderson, P.M.

1985-01-01

282

Textural, chemical and isotopic variations induced by hydrothermal fluids on mesozoic limestones in northwestern Sicily  

Microsoft Academic Search

The results are given of textural and compositional investigations carried out on carbonate materials outcropping in various localities in northwestern Sicily where fluorite, barite and calcite mineralizations of hydrothermal origin occur. Observation of the textural features indicate variations in the degree of calcite recrystallization and silicification that appear to be more marked in rocks that show more evident effects of

A. Bellanca; P. Censi; P. Di Salvo; R. Neri

1984-01-01

283

Benthic Nutrient Cycling and Diagenetic Pathways in the North-western Black Sea  

Microsoft Academic Search

Benthic fluxes of nutrients and metals were measured in the coastal zone of the north-western Black Sea, which is influenced by the Danube and Dniestr rivers. The results from the benthic flux chambers deployed during two EROS 21 cruises in summer 1995 and in spring 1997 yield information on benthic nutrient cycling and diagenetic pathways at the sediment-water interface. This

J. Friedrich; C. Dinkel; G. Friedl; N. Pimenov; J. W. M. Wijsman; M.-T. Gomoiu; A. Cociasu; L. Popa; B. Wehrli

2002-01-01

284

The ventilation of near-bottom shelf waters in the North-Western Black Sea  

E-print Network

The ventilation of near-bottom shelf waters in the North-Western Black Sea Georgy Shapiro, Fred of these areas to be ventilated by horizontal ex- changes during that period is assessed by a long-term time however be ventilated horizontally with deep-sea waters through isopycnal exchanges across the shelf break

Shapiro, Georgy

285

Impact of climate change on the Northwestern Mediterranean Sea pelagic planktonic ecosystem and associated carbon cycle  

E-print Network

and associated carbon cycle M. Herrmann, C. Estournel, F. Diaz, F. Adloff ; LEGOS, LA, MIO, CNRM The northwestern and associated carbon cycle to the long-term evolution of oceanic and atmospheric circulations. For that we planktonic ecosystem and associated carbon cycle at a first order. However, differences mainly induced

286

Please note the short time frame. NORTHWESTERN UNIVERSITY -OFFICE OF RESEARCH DEVELOPMENT  

E-print Network

Please note the short time frame. NORTHWESTERN UNIVERSITY - OFFICE OF RESEARCH DEVELOPMENT Limited and Reconciliation : DRL seeks to fund programs that promote tolerance, counter rising sectarianism--with a view/forced displacement, and conflict- related violence, including gender-based violence. Human Rights Protection

Contractor, Anis

287

Search for Service Requests in FAMIS Web 07/10/2013, FAMIS, vlr 2013 Northwestern University  

E-print Network

Search for Service Requests in FAMIS Web FAMIS 07/10/2013, FAMIS, vlr © 2013 Northwestern University job aid Page 1 of 2 You can use FAMIS Web as an alternative to quickly find service requests and all the associated information. FAMIS Web offers more fields and a field look-up tool to expedite your

Shull, Kenneth R.

288

About FAMIS Web 06/15/2013, About FAMIS Web, vlr 2013 Northwestern University  

E-print Network

About FAMIS Web FAMIS 06/15/2013, About FAMIS Web, vlr © 2013 Northwestern University job aid Page 1 of 1 Who can access FAMIS Web? Anyone who can log in to the FAMIS Admin application can log into FAMIS Web. What is FAMIS Web? FAMIS Web is a more intuitive web-based application that allows more

Shull, Kenneth R.

289

Guidelines for Investigators in Scientific Research Page 1 of 3 Northwestern University  

E-print Network

Guidelines for Investigators in Scientific Research Page 1 of 3 Northwestern University Guidelines for Investigators in Scientific Research Introduction These Guidelines for Investigators in Scientific Research were in each research unit. 2. The ratio of trainees to preceptors should be small enough to permit scientific

Shahriar, Selim

290

Feeding ecology of striped dolphins, Stenella coeruleoalba, in the north-western  

E-print Network

Feeding ecology of striped dolphins, Stenella coeruleoalba, in the north-western Mediterranean Sea, Aberdeenshire, AB41 6AA UK The feeding ecology of striped dolphin, Stenella coeruleoalba, in the north measured in skin and muscle tissues of stranded and by-caught dolphins from six geographical areas

Stockin, Karen

291

Inference in Ecology: The Sea Urchin Phenomenon in the Northwestern Atlantic  

Microsoft Academic Search

We have reviewed the considerable body of research into the sea urchin phenomenon responsible for the alternation between macroalgal beds and coralline barrens in the northwestern Atlantic. In doing so, we have identified problems with both the scientific approach and the interpretation of results. Over a period of approximately 20 years, explanations for the phenomenon invoked four separate scenarios, which

R. W. Elner; Robert Vadas

1990-01-01

292

Forest fires, woodland caribou and land use policies in northwestern Ontario (Rangifer tarandus)  

Microsoft Academic Search

Woodland caribou (Rangifer tarandus caribou) are a threatened species in Ontario's boreal forest. Caribou require habitat that supports appropriate forage, including large areas of lichen rich forests. This research examines two dynamics that influence woodland caribou habitat in northwestern Ontario. These dynamics are forest fires and land use policies. The effects of forest fires are assessed quantitatively at both the

Brian Frederick Kutas

2004-01-01

293

Estimate of gas hydrate resource, northwestern Gulf of Mexico continental slope  

Microsoft Academic Search

Estimates of gas hydrate sequestered on the northwestern Gulf of Mexico (NWGOM) continental slope are presented. The volume of gas hydrate reservoir is estimated based on the relationship between geologic setting, water depth and the gas hydrate stability zone. A conceptual model of gas hydrate occurrence defines two types of gas hydrate accumulations in the NW GOM: (1) structurally focused

Alexei V Milkov; Roger Sassen

2001-01-01

294

The Forests of Southwestern Colorado and Northwestern New Mexico: How the Past and  

E-print Network

The Forests of Southwestern Colorado and Northwestern New Mexico: How the Past and Present Inform our Choices for the Future William H. Romme, M. Lisa Floyd, David Hanna July 30, 2009 USDA Forest Highlands Section is a major forested region centered on the San Juan Mountains of southwestern Colorado

295

On the near-bottom variability in the northwestern Weddell Sea  

Microsoft Academic Search

The thermohaline data from the first Brazilian hydrographic cruise to the northwestern Weddell Sea (AR XVIII) revealed significant near-bottom changes in water-column properties over seasonal and interannual time scales. Favorable ice conditions in 2000 allowed a dense station coverage of the area including the main pathways for Weddell Sea deep and bottom waters. The new results are compared with the

M. Schroder; H. H. Hellmer; J. M. Absy

2002-01-01

296

Memory Consolidation: Systems K A Paller, Northwestern University, Evanston, IL, USA  

E-print Network

Memory Consolidation: Systems K A Paller, Northwestern University, Evanston, IL, USA ã 2009 Elsevier Ltd. All rights reserved. The Consolidation of a Memory At the moment when we perceive an event, the jour- ney of memory storage begins. In a sense, such an event may exist for many years before finally

Paller, Ken

297

A possible bedrock source for obsidian found in archeological sites in northwestern alaska.  

PubMed

Recently discovered deposits of obsidian in the Koyukuk valley may be the long-sought-for source of obsidian found in archeological sites in northwestern Alaska. Obsidian from these deposits compares favorably in physical characteristics and sodium-manganese ratio with the archeological obsidian, and there is evidence that the deposits have been "mined" in the past. PMID:17820304

Patton, W W; Miller, T P

1970-08-21

298

Global Positioning System (GPS) estimates of crustal deformation in the Marmara Sea region, Northwestern Anatolia  

Microsoft Academic Search

In the Marmara Sea region the relative motion between the Anatolian and Eurasian lithosphere has been measured by means of the modern techniques of space geodesy using the Global Positioning System (GPS). In order to resolve in detail the kinematic field within the active earthquake belts of Northwestern Anatolia, two GPS campaigns were carried out across a dense network consisting

Christian Straub; Hans-Gert Kahle

1994-01-01

299

Stratigraphic and structural evolution of the Blue Nile Basin, Northwestern Ethiopian Plateau  

Microsoft Academic Search

The Blue Nile Basin, situated in the Northwestern Ethiopian Plateau, contains ? 1400 m thick Mesozoic sedimentary section underlain by Neoproterozoic basement rocks and overlain by Early-Late Oligocene and Quaternary volcanic rocks. This study outlines the stratigraphic and structural evolution of the Blue Nile Basin based on field and remote sensing studies along the Gorge of the Nile. The Blue

N. D. S. GANI; M. G. Abdelsalam; S. Gera; M. R. Gani

2009-01-01

300

Is the Northwestern Decision a Wake-Up Call for Higher Ed Institutions?  

ERIC Educational Resources Information Center

The recent decision by a regional director of the National Labor Relations Board (NLRB) that Northwestern University football players on scholarship are "employees" entitled to unionize under the National Labor Relations Act (NLRA) should serve as a wake-up call for higher education administrators. Part of a trend in which both the NLRB…

Ambash, Joseph W.

2014-01-01

301

Mesozoic magnetic anomaly lineations and seafloor spreading history of the northwestern Pacific  

Microsoft Academic Search

We have identified Late Jurassic to Early Cretaceous magnetic anomaly lineations (M0 to M35 of the Japanese and Hawaiian lineation sets) and fracture zones in the northwestern Pacific more comprehensively than previous investigators. We fixed 3500 positions of magnetic anomalies identified from magnetic data collected along cruise tracks as well as 151 positions of fracture zones from bathymetric and seismic

Masao Nakanishi; Kensaku Tamaki; Kazuo Kobayashi

1989-01-01

302

Reproductive Ecology of Pseudemys floridana and Trachemys scripta (Testudines: Emydidae) in Northwestern Florida  

Microsoft Academic Search

The Cooter, Pseudemys floridana, and the Pond Slider, Trachemys scripta, are two abundant freshwater turtles in the southeastern United States, but little is known of their reproductive ecology in northwestern Florida. I studied their nesting phenology and behavior, clutch size and frequency, rates of nest predation, and hatchling overwintering behavior from 2001-2003 at Lake Jackson, Leon County, Florida. Both species

Matthew J. Aresco

2004-01-01

303

Five species of sea turtles in the northwestern Atlantic Ocean are  

E-print Network

671 Five species of sea turtles in the northwestern Atlantic Ocean are protected under the U.S. Endangered Species Act of 1973. The loggerhead turtle (Caretta caretta) is listed as a threatened species kempii), and certain populations of the green sea turtle (Chelonia mydas) are listed as endangered

304

Carex of Northeastern Illinois and Northwestern Indiana, USA Sedges (Carex spp.) of the Chicago Region  

E-print Network

Carex of Northeastern Illinois and Northwestern Indiana, USA Sedges (Carex spp.) of the Chicago spike tipped w/... 2b. C. pellita BROAD-LEAVED WOOLLY SEDGE: [= C. lanuginosa] plants rhizomatous hairs. Usually dry open woods (e.g. oak savannas). WEB VERSION #12;Carex of Northeastern Illinois

Hipp, Andrew

305

The Geologic Aspects of Reservoir Characterization for Numerical Simulation: Mesaverde Meanderbelt Sandstone, Northwestern Colorado  

Microsoft Academic Search

Major shortcomings in the geologic descriptions used in numerical simulations are addressed by a reservoir characterization of Mesaverde sandstone outcrops in northwestern Colorado. A geologic model for Mesaverde point-bar deposits using core plug data relates permeability trends to stratification type. This reservoir characterization helps develop a general reservoir descriptor that analyzes actual field permeability data that are related to an

J. R. Jones; A. J. Scott; L. W. Lake

1987-01-01

306

Spatial variability of some soil chemical properties in alluvial plains of northwestern India  

Microsoft Academic Search

A survey of the soils of alluvial plains of northwestern India was carried out and measurements of soil chemical properties were made over 470 sites on a grid of 10 km x 10 km. The data were analyzed geostatistically to determine the degree and nature of spatial dependence. Variation appeared to be isotropic. The available N, P, and K showed

M. S. Grewal; I. S. Dahiya; Anil Kumar

1997-01-01

307

NORTHWESTERN UNIVERSITY System Design and Verification of the Precession Electron Diffraction Technique  

E-print Network

of the coil. Because the system is configured to be single-ended, it is susceptible to external factorsNORTHWESTERN UNIVERSITY System Design and Verification of the Precession Electron Diffraction precession systems. A.1. Limited-bandwidth systems In feedback control theory, a system represents an entity

Shull, Kenneth R.

308

Summer Cattle Transhumance and Wild Edible Plant Gathering in a Mapuche Community of Northwestern Patagonia  

Microsoft Academic Search

Cattle transhumance has been practiced since colonial times in Mapuche communities of northwestern Patagonia, which travelled seasonally along the Andean valleys from arid lands towards temperate forests. In this study, we analyzed how this migratory practice affects the abundance and variety of wild edible plants utilized by the Mapuche community of Paineo. Patterns of use for those who practice transhumance

Ana H. Ladio; Mariana Lozada

2004-01-01

309

Identifying changing climate responses of boreal forest trees in northwestern Canada  

E-print Network

to examine the extent to which apparent divergence of Picea glauca growth in northwestern boreal Canada may of this ongoing research. [1]. Picea glauca growth has an ubiquitous response to summer moisture balance Acknowledgments Tree-ring processing Introduction A network of 32 tree-ring width sites of Picea glauca located

Feigon, Brooke

310

The Phytophagous Insect Fauna of Scotch Thistle, Onopordum acanthium L., in Southeastern Washington and Northwestern Idaho  

Microsoft Academic Search

Scotch thistle, Onopordum acanthium L. (Asteraceae: Cardueae), a plant of Eurasian origin, has become an increasingly serious pasture, rangeland, wasteland, and roadside weed in the western United States. Prior to the implementation of a biological control agent acquisition and release program, a domestic survey was carried out at 16 sites in five southeastern Washington and northwestern Idaho counties between 1995-96

J. D. WATTS; G. L. PIPER

311

Epibenthic invertebrates and fishes of the continental shelf of the northwestern Gulf of Mexico  

E-print Network

Data from 34 epibenthic trawls were made on the continental shelf of the northwestern Gulf of Mexico between depths 13 and 400 meters. These took 6,468 individuals belonging to 251 species of demersal fishes and invertebrates, with a mean number...

Al-Jabr, Abdulrahman Mohammad

1995-01-01

312

Transition in the cause of fever from malaria to dengue, Northwestern Ecuador, 1990-2011.  

PubMed

In tropical areas, the predominant cause of fever has historically been malaria. However by 2011, among febrile patients in northwestern Ecuador, dengue was identified in 42% and malaria in none. This finding suggests a transition in the cause of fever from malaria to other illnesses, such as dengue. PMID:24047566

Cifuentes, Sara G; Trostle, James; Trueba, Gabriel; Milbrath, Meghan; Baldeón, Manuel E; Coloma, Josefina; Eisenberg, Joseph N S

2013-10-01

313

Northwestern University Archives Evanston, Illinois OLIVER MARCY (1820-1899) PAPERS  

E-print Network

posts. In addition to the sciences, Marcy taught natural theology, moral science, philosophy, logic Seminary in Dutchess County, New York. Marcy took the position of professor of natural science, and Greek. Marcy established the Northwestern University Museum of Natural History and served as its curator

314

Natal philopatry and recruitment of willow ptarmigan in north central and northwestern Canada  

Microsoft Academic Search

Natal philopatry and recruitment were measured in two populations of willow ptarmigan; one near Churchill, Manitoba and the other in northwestern British Columbia. We examined the return of tagged offspring in subsequent years with respect to geographical area, annual variation, their age when tagged, their sex, their body weight, age and number of their parents, and time of hatch (first

K. Martin; S. J. Hannon

1987-01-01

315

Northwestern University Archives Evanston, Illinois WOMEN'S SELF-GOVERNMENT ASSOCIATION SCRAPBOOK, 1926-1931  

E-print Network

's organizations on campus, including literary societies, sororities and the Young Women's Christian Association" in the "Christian association, influence and discipline" that women received there. These rules governing womenNorthwestern University Archives · Evanston, Illinois WOMEN'S SELF-GOVERNMENT ASSOCIATION SCRAPBOOK

316

Secondary succession in disturbed and reclaimed sagebrush communities of northwestern Colorado  

Microsoft Academic Search

The objective of this dissertation was the study of natural and induced secondary succession and soil biological activity in disturbed lands and reclaimed areas of a big sagebrush community (Artemisia tridentata) in northwestern Colorado. Four types of treatments were utilized to study soil disturbance effects in secondary succession: 1) vegetation was scraped off with as much topsoil left as possible,

Biondini

1984-01-01

317

Northwestern University Career Services -Career Development Timeline for Masters Students* Year 1 Summer Year 2  

E-print Network

Summer Year 2 *Varies by Discipline and length of program Explore Career Options Conduct online researchNorthwestern University Career Services - Career Development Timeline for Masters Students* Year 1 a specific field Explore Career Options Continue suggestions in bold from Year 1 Develop a list of desired

Shull, Kenneth R.

318

Water quality Data from two Agricultural Drainage Basins in Northwestern Indiana and  

E-print Network

Water quality Data from two Agricultural Drainage Basins in Northwestern Indiana and Northeastern Foresman, Indiana, on May 22, 2002. Bottom photo, Sugar Creek at the State Highway 71 bridge near Raub, Indiana, on February 27, 2002. #12;In cooperation with U.S. Department of Agriculture Water-quality Data

319

Innovations in Literacy Learning: Reaching the Remote Northwestern Communities of Ontario  

ERIC Educational Resources Information Center

The Sioux Hudson Literacy Council in partnership with AlphaPlus Centre in Toronto, Ontario and Confederation College, Sioux Lookout Campus, is making groundbreaking strides to reach adult learners who reside in remote, isolated communities of Northwestern Ontario. Generous funding from the National Literacy Secretariat in collaboration with…

Eady, Michelle

2006-01-01

320

Evidence for bimodal hybrid zones between two species of char (Pisces: Salvelinus) in northwestern North America  

Microsoft Academic Search

Dolly Varden (Salvelinus malma, Pisces: Salmonidae) and bull trout (Salvelinus confluentus) have widely overlapping, but largely parapatric ranges in water- sheds in northwestern North America from Washington State to northern British Columbia. Genetic analysis of natural populations using diagnostic molecular markers revealed widespread local sympatry and hybridization with hybrids comprising 0-25% of the local samples. In a detailed analysis of

Z. Redenbach; E. B. Taylor

2003-01-01

321

Development and Fire Trends in Oak Woodlands of the Northwestern Sierra  

E-print Network

Development and Fire Trends in Oak Woodlands of the Northwestern Sierra Nevada Foothills1 James G. Spero2 Abstract Human development appears to present a larger threat to the long-term persistence) projections of human development and fire occurrence and explores trends in the incidence of fire

Standiford, Richard B.

322

SOURCE CHARACTERISTICS OF HYPOTHETICAL SUBDUCTION EARTHQUAKES IN THE NORTHWESTERN UNITED STATES  

Microsoft Academic Search

Historic earthquake sequences on subduction zones that are similar to the Cascadia subduction zone are used to hypothesize the nature of shallow sub- duction earthquakes that might occur in the northwestern United States. Based on systematic comparisons of several physical characteristics, including phy- siography and seismicity, subduction zones that are deemed most similar to the Cascadia subduction zone are those

THOMAS H. HEATON; STEPHEN H. HARTZELL

1986-01-01

323

Tsunami Deposits beneath Tidal Marshes on Northwestern Vancouver Island, British Columbia  

Microsoft Academic Search

Two sand sheets underlying tidal marshes at Fair Harbour, Neroutsos Inlet, and Koprino Harbour on the northwestern coast of Vancouver Island, British Columbia, were probably deposited by tsunamis. The sand sheets become thinner and finer-grained landward, drape former land surfaces, contain marine microfossils, are locally graded or internally stratified, and can be correlated with earthquakes that generated tsunamis in the

Boyd E. Benson; Kurt A. Grimm; John J. Clague

1997-01-01

324

Nitrate distributions and source identification in the Abbotsford-Sumas Aquifer, northwestern Washington State  

USGS Publications Warehouse

The Abbotsford-Sumas Aquifer is a shallow, predominantly unconfined aquifer that spans regions in southwestern British Columbia, Canada and northwestern Washington, USA. The aquifer is prone to nitrate contamination because of extensive regional agricultural practices. A 22-month ground water nitrate assessment was performed in a 10-km2 study area adjacent to the international boundary in northwestern Washington to examine nitrate concentrations and nitrogen isotope ratios to characterize local source contributions from up-gradient sources in Canada. Nitrate concentrations in excess of 10 mg nitrate as nitrogen per liter (mg N L-1) were observed in ground water from most of the 26 domestic wells sampled in the study area, and in a creek that dissects the study area. The nitrate distribution was characteristic of nonpoint agricultural sources and consistent with the historical documentation of agriculturally related nitrate contamination in many parts of the aquifer. Hydrogeologic information, nitrogen isotope values, and statistical analyses indicated a nitrate concentration stratification in the study area. The highest concentrations (>20 mg N L-1) occurred in shallow regions of the aquifer and were linked to local agricultural practices in northwestern Washington. Nitrate concentrations in excess of 10 mg N L-1 deeper in the aquifer (>10 m) were related to agricultural sources in Canada. The identification of two possible sources of ground water nitrate in northwestern Washington adds to the difficulty in assessing and implementing local nutrient management plans for protecting drinking water in the region.

Mitchell, R.J.; Babcock, R.S.; Gelinas, S.; Nanus, L.; Stasney, D.E.

2003-01-01

325

Soil quality standards and guidelines for forest sustainability in northwestern North America$  

E-print Network

Soil quality standards and guidelines for forest sustainability in northwestern North America of the ®rst in the world to be developed to evaluate changes in forest soil productivity and sustainability `sustainable forests', `sustainable forestry practices', and `long-term productivity'. These terms are used

326

Natural History of a Relict Population of Topeka Shiner (Notropis topeka) in Northwestern Kansas  

Microsoft Academic Search

The Topeka shiner (Notropis topeka), an endemic minnow of the Great Plains, has been extirpated over much of its former range. The U.S. Fish and Wildlife Service listed it as an endangered species in January 1999. The only extant population of N. topeka remaining on the High Plains is located in northwestern Kansas. During 1999, we studied aspects of the

William J. Stark; Jason S. Luginbill; Mark E. Eberle

2002-01-01

327

Deep-water decapod crustacean communities in the Northwestern Mediterranean: influence of submarine canyons and season  

Microsoft Academic Search

The specific composition and abundance of bathyal decapods in the Catalan Sea were investigated. A total of 109 bottom trawls were effected at depths ranging from 141 to 730 m on the continental slope in the Catalan Sea (northwestern Mediterranean) during two sampling cruises in spring and autumn 1991. Multivariate analysis of the samples revealed four groups of the decapod

J. E. Cartes; F. Maynou

1994-01-01

328

Education, Employment and Empowerment: The Case of a Young Woman in Northwestern China  

ERIC Educational Resources Information Center

As a marginalized region of the world, the rural Gansu Province of northwestern China provides an informative canvas on which to examine and understand the ways in which education contributes to the lives of local Muslim women and supports their goals for work. Specifically, this article highlights the role education plays in the life of one young…

Maslak, Mary Ann

2011-01-01

329

Bedout: A Possible End-Permian Impact Crater Offshore of Northwestern Australia  

Microsoft Academic Search

The Bedout High, located on the northwestern continental margin of Australia, has emerged as a prime candidate for an end-Permian impact structure. Seismic imaging, gravity data, and the identification of melt rocks and impact breccias from drill cores located on top of Bedout are consistent with the presence of a buried impact crater. The impact breccias contain nearly pure silica

L. Becker; R. J. Poreda; A. R. Basu; K. O. Pope; T. M. Harrison; C. Nicholson; R. Iasky

2004-01-01

330

Spatiotemporal dynamics of evapotranspiration at the Glacial Ridge prairie restoration in northwestern Minnesota  

Microsoft Academic Search

Among the various indicators of success in wetland restoration, hydrology is the most important and relatively easy to monitor. Evapotranspiration (ET) was used to assess the ecohydrologic changes at the Glacial Ridge prairie restoration site in northwestern Minnesota. Twelve Landsat images from 2000-03 for the months of June, July and August were used to study the spatial ET changes. Spatial

Assefa M. Melesse; Jason Oberg; Vijay Nangia; Ofer Beeri; David Baumgartner

2006-01-01

331

Home Range and Site Fidelity of Imperiled Ornate Box Turtles (Terrapene ornata) in Northwestern Illinois  

E-print Network

Home Range and Site Fidelity of Imperiled Ornate Box Turtles (Terrapene ornata) in Northwestern, Evolution and Organismal Biology, Iowa State University, 251 Bessey Hall, Ames, Iowa 50011-1020 USA [refsnij box turtle (Terrapene ornate) across much of its range. Land management agencies are considering

Janzen, Fredric

332

Climate downscaling for estimating glacier mass balances in northwestern North America: Validation with a USGS  

E-print Network

Climate downscaling for estimating glacier mass balances in northwestern North America: Validation] An atmosphere/glacier modeling system is described for estimating the mass balances of glaciers in both current to force a precipitation- temperature-area-altitude (PTAA) glacier mass balance model with daily maximum

Bhatt, Uma

333

The Areal Pattern of Burned Tree Vegetation in the Subarctic Region of Northwestern Canada  

Microsoft Academic Search

Vegetation and terrain analyses of 1312 air photos spanning the subarctic, low arctic, and portions of the adjacent high boreal region of northwestern Canada permitted geographic characterization of the areal pattern of burned forest and forest-tundra vegetation. In terms of its lower areal extent of burns, and lower frequency of air photos showing burns, the forest-tundra is distinct from both

K. P. TIMONEY; ROSS W. WEIN

1991-01-01

334

A possible bedrock source for obsidian found in archeological sites in northwestern Alaska  

USGS Publications Warehouse

Recently discovered deposits of obsidian in the Koyukuk valley may be the long-sought-for source of obsidian found in archeological sites in northwestern Alaska. Obsidian from these deposits compares favorably in physical characteristics and sodium-manganese ratio with the archeological obsidian, and there is evidence that the deposits have been "mined" in the past.

Patton, W.W., Jr.; Miller, T.P.

1970-01-01

335

Gas reserves in medina group of northwestern Pennsylvania as related to fracture-porosity and stratigraphic control  

SciTech Connect

Gas reserves in the Medina Group of northwestern Pennsylvania were investigated for fracture-porosity and stratigraphic control with remote sensing and geophysical tools. Lineaments were mapped on Landsat MSS band 7 (scale 1:250,000), and RBV (scales 1:125,000 and 1:500,000) images, and low-altitude photographs (scale 1:20,000). Zones of high estimated-net gas reserves were noted along French Creek, between Meadville and Franklin, Pennsylvania. A lineament, which bisects the French Creek Lineament and is oriented N55/sup 0/E, also parallels and overlaps gas-pool trends. The largest gas pool underlies an area devoid of lineaments mapped on Landsat imagery. The ..gamma..-ray log was used to establish stratigraphic parameters and to approximate lithologies. Sandstones were subdivided into qualities representing degrees of shaliness. Other variables derived from this log with respect to the Medina Group include: depth below sea level, formation thickness, net-sandstone thickness, and Cabot Head Shale thickness. The Whirlpool Sandstone Member was not included in this analysis. No statistical correlation was found between the above variables and estimated-net gas reserves. Visual inspection reveals trends common to the isopach maps and estimated-net gas reserves. Thus, stratigraphic control probably is important to hydrocarbon-pool location and geometry, with the proper combination of variables yet to be identified.

Star, I.; Gold, D.P.; Canich, M.R.

1984-12-01

336

Hiatus-related processes: Paleokarst, paleosol, and a transgressive rocky shore from the Mississippian-Pennsylvanian unconformity in northwestern Arkansas  

SciTech Connect

Unconformities are often considered only as stratigraphic gaps or sequence boundaries despite the evidence of climate- and paleogeography-linked hiatus processes that they may preserve. In northwestern Arkansas, progressively older Paleozoic strata are truncated to the north and west by the Mississippian-Pennsylvanian unconformity. In southern Washington County, Arkansas, the partly truncated Chesterian Pitkin Limestone is unconformably overlain by the Cane Hill Member of the Morrowan Hale Formation. The top of the Pitkin Limestone locally consists of cryptokarst with abundant solution pipes and lithoclasts formed by dissolution fragmentation. These lithoclasts, and surrounding clay dissolution residue, form regolith that is increasingly altered by pedogenic calcretization towards the top. The basal conglomerate of the overlying Cane Hill Member is interpreted as a transgressive boulder shore deposit. Conglomerate clasts consist of Pitkin cobbles and boulders that were derived from the erosion of local Pitkin highs.'' Most clasts are heavily bored on all sides by a variety of Trypanites and acrothoracian barnacle borings. Encrusting bryozoans and the encrusting tabulate coral, Michelinia, complete the rocky shore fauna. Preservation of paleokarst and poorly-indurated paleosol in low-lying areas around the eroded Pitkin highs,'' suggests that: (1) the vast majority of missing Pitkin was removed from the section by karstification during the hiatus, and not by erosion during the subsequent transgression; (2) transgression was too rapid to effectively scour the transgressed surface to bed rock; and (3) the net nearshore sediment transport direction was shoreward as the sea transgressed.

Webb, G.E. (Texas A and M Univ., College Station, TX (United States). Dept. of Geology)

1992-01-01

337

High-frequency fluxes of labile compounds in the central Ligurian Sea, northwestern Mediterranean  

NASA Astrophysics Data System (ADS)

Sinking particles were collected every 4 h with drifting sediment traps deployed at 200 m depth in May 1995 in a 1-D vertical system during the DYNAPROC observations in the northwestern Mediterranean sea. POC, proteins, glucosamine and lipid classes were used as indicators of the intensity and quality of the particle flux. The roles of day/night cycle and wind on the particle flux were examined. The transient regime of production from late spring bloom to pre-oligotrophy determined the flux intensity and quality. POC fluxes decreased from, on average, 34 to 11 mg m -2 d -1, representing 6-14% of the primary production under late spring bloom conditions to 1-2% under pre-oligotrophic conditions. Total protein and chloroplast lipid fluxes correlated with POC and reflected the input of algal biomass into the traps. As the season proceeded, changes in the biochemical composition of the exported material were observed. The C/N ratio rose from 7.8 to 12. Increases of serine (10-28% of total proteins), total lipids (7-9 to 14-28% of POC) and reserve lipids (1-5 to 5-22% of total lipids) were noticeable, whereas total protein content in POC decreased (20-27 to 18-7%). N-acetyl glucosamine, a tracer of fecal pellet flux, showed that zooplankton grazing was a major vector of downward export during the decaying bloom. Against this background pattern, episodic events specifically increased the flux, modifying the quality and the settling velocity of particles. Day/night signals in biotracers (POC, N-acetyl glucosamine, protein and chloroplast lipids) showed that zooplankton migrations were responsible for sedimentation of fresh material through fast sinking particles ( V=170-180 m d -1) at night. Periodic signatures of re-processed material (high lipolysis and bacterial biomass indices) suggested that other zooplankton fecal pellets or small aggregates, probably of lower settling velocities ( V<170 m d -1), contributed to the flux during calm periods. At the beginning of the experiment, during the development of a prymnesiophyte bloom in the upper layers, the sterol signal with no periodicity enabled us to estimate high particle settling velocities (?600 m d -1) likely related to large aggregate formation. A wind event increased biotracer fluxes (POC, protein, chloroplast lipids). The rapid transmission of surface signals through extremely fast sinking particles could be a general feature of particle fluxes in marine areas unaffected by horizontal advection.

Goutx, M.; Momzikoff, A.; Striby, L.; Andersen, V.; Marty, J. C.; Vescovali, I.

2000-03-01

338

Flooding of property by runoff from agricultural land in northwestern Europe  

NASA Astrophysics Data System (ADS)

In the last twenty years there has been an increase in the incidence of flooding of property by runoff from agricultural land in many areas of northwestern Europe. These events take the form of inundations by soil-laden water associated with erision and the formation of ephemeral or talweg gullies developed in normally dry valley bottoms. Costs of such events may be considerable e.g. almost US$2M at Rottingdean, southern England, in 1987. These costs are largely borne by individual house occupants, insurance companies and local councils. The distribution of flooding is widespread but areas of high risk can be identified: the hilly area of central Belgium, parts of northern France, the South Downs in southern England and South-Limburg (the Netherlands). All these areas have silty, more or less loessial soils. Two types of flooding may be distinguished: winter flooding associated with wet soils and the cultivation of winter cereals, and summer flooding due to thunderstorm activity and runoff particularly from sugar beet, maize and potato crops. The distribution of these types of erosion varies in relation to the interaction between physical characteristics (soils and topography), climatic conditions and land use across the region. The reason for the recent increase in flooding events appears to be changes in land use, in the area of arable cropping, and the continued intensification of farming such as the use of chemical fertilizers, the decline in aggregate stability, the increase in the size of fields and compaction by farm vehicles. In some regions the risk of flooding has also increased because of expansion of urban areas in valley bottom locations. Communities have responded to the flooding hazard with emergency or protective measures usually involving engineered structures rather than land use change. The policy response to the increased risk of flooding has been very limited especially at the national and provincial level, the exception being plans developed with farming organisations in South-Limburg and the Pays de Caux. In southern England initiatives have been few and largely consist of protective measures undertaken by urban municipalities.

Boardman, John; Ligneau, Laurence; de Roo, Ad; Vandaele, Karel

1994-08-01

339

Digital data sets that describe aquifer characteristics of the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma  

USGS Publications Warehouse

ARC/INFO export and nonproprietary format files This diskette contains digitized aquifer boundaries, maps of hydraulic conductivity, recharge, and ground-water level elevation contours for the alluvial and terrace deposits along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma. Ground water in 1,305 square miles of Quaternary-age alluvial and terrace deposits along the the Cimarron River from Freedom to Guthrie is an important source of water for irrigation, industrial, municipal, stock, and domestic supplies. Alluvial and terrace deposits are composed of interfingering lenses of clay, sandy clay, and cross-bedded poorly sorted sand and gravel. The aquifer is composed of hydraulically connected alluvial and terrace deposits that unconformably overlie the Permian-age Formations. The aquifer boundaries are from a ground-water modeling report on the alluvial and terrace aquifer along the Cimarron River from Freedom to Guthrie in northwestern Oklahoma and published digital surficial geology data sets. The aquifer boundary data set was created from digital geologic data sets from maps published at a scale of 1:250,000. The hydraulic conductivity values, recharge rates, and ground-water level elevation contours are from the ground-water modeling report. Water-level elevation contours were digitized from a map at a scale of 1:250,000. The maps were published at a scale of 1:900,000. Ground-water flow models are numerical representations that simplify and aggregate natural systems. Models are not unique; different combinations of aquifer characteristics may produce similar results. Therefore, values of hydraulic conductivity and recharge used in the model and presented in this data set are not precise, but are within a reasonable range when compared to independently collected data.

Adams, G.P.; Runkle, Donna; Rea, Alan; Cederstrand, J.R.

1997-01-01

340

Stable Isotopic Constraints of the Turpan Basin in Northwestern China  

NASA Astrophysics Data System (ADS)

Stable isotopic analysis of sedimentary rocks can be used to reconstruct past geologic changes in the elevation and climate of topographic features such as mountain ranges and plateaus. The Tibetan Plateau is an ideal field laboratory for conducting this type of study because of the Plateau’s extreme topographic relief and relatively recent geologic growth. Here we present oxygen and carbon isotope compositions from a suite of sedimentary rock samples taken from the western Turpan Basin in northwestern China. This area of the basin collects sediment from weathering and erosion of the Bogda Shan located to the north. The goal of this study is to analyze changes in the stable isotope composition as a function of stratigraphic position to reconstruct paleoelevations and paleoclimates in this part of the Tibetan Plateau. The sedimentary rock samples analyzed in this study are Late Jurassic to Neogene age and are primarily mudstone, siltstone, fine sandstone along with lesser limestone. Samples were powered and then dissolved with phosphoric acid at 72?C. The liberated CO2 gas was then analyzed using a Finnigan Delta Plus XL mass spectrometer with a gasbench inlet system. Oxygen isotope values range from -13.72 to -1.62‰ (PDB) and exhibit a large scale trend to more negative values toward the top of the stratigraphic sequence. Superimposed on this large scale trend are systematic variations in isotopic composition as a function of age. The most positive ?18O values occur at approximately 160, 115, 60, and 5 ma. Conversely, ?18O minima are observed at 150, 90, and 40 ma. ?13C values range from -10.69‰ to 1.40‰ (PDB). The most positive ?13C values (-4.3 to 1.4) occur from 120-160 ma. Younger samples display small scale variations with age with notable ?13C minima of -10.7, -14.7, and -7.6‰ at 108, 80, and 17 ma, respectively. The variable ?18O and positive ?13C values from the Jurassic (145-160 ma) are consistent with an arid climate and high atmospheric PCO2 levels during the warm Mesozoic Era. The overall decrease in ?18O values observed during the Cretaceous (145-65 ma) can be explained by the global climatic transition from a warm Mesozoic to a relatively cool Cenozoic Era. We take into account other possible influences on the isotopic record including detrital effects, diagensis, and evaporation, but infer the primary control on the isotopic records to be changes in climate during these time periods. Because the magnitude of oxygen isotope changes is consistent with that expected due to global climate change, we infer that there were not significant changes in the elevation of the Bogda Shan during this time period. This conclusion is also supported by the similar grain size/lithology (siltstone-finer grained sandstones) from bottom to top through the stratigraphic sequence, consistent with dormant topography prior to the Tertiary Period.

Schaen, A. J.

2010-12-01

341

Canopy storage capacity of xerophytic shrubs in Northwestern China  

NASA Astrophysics Data System (ADS)

SummaryThe capacity of shrub canopy water storage is a key factor in controlling the rainfall interception. Thus, it affects a variety of hydrological processes in water-limited arid desert ecosystems. Vast areas of revegetated desert ecosystems in Northwestern China are occupied by shrub and dwarf shrub communities. Yet, data are still scarce regarding their rainwater storage capacity. In this study, simulated rainfall tests were conducted in controlled conditions for three dominant xerophytic shrub types in the arid Tengger Desert. Eight rainfall intensities varying from 1.15 to 11.53 mm h-1 were used to determine the canopy water storage capacity. The simulated rainfall intensities were selected according to the long-term rainfall records in the study area. The results indicate that canopy storage capacity (expressed in water storage per leaf area, canopy projection area, biomass, and volume of shrub respectively) increased exponentially with increase in rainfall intensity for the selected shrubs. Linear relationships were found between canopy storage capacity and leaf area (LA) or leaf area index (LAI), although there was a striking difference in correlation between storage capacity and LA or LAI of Artemisia ordosica compared to Caragana korshinskii and Hedysarum scoparium. This is a result of differences in biometric characteristics, especially canopy morphology between the shrub species. Pearson correlation coefficient indicated that LA and dry biomass are better predictors as compared to canopy projection area and volume of samples for precise estimation of canopy water storage capacity. In terms of unit leaf area, mean storage capacity was 0.39 mm (range of 0.24-0.53 mm), 0.43 mm (range of 0.28-0.60 mm), and 0.61 mm (range of 0.29-0.89 mm) for C. korshinskii, H. scoparium, and A. ordosica, respectively. Correspondingly, divided per unit dry biomass, mean storage capacity was 0.51 g g-1 (range of 0.30-0.70 g g-1), 0.41 g g-1 (range of 0.26-0.57 g g-1), and 0.73 g g-1 (range of 0.38-1.05 g g-1) for C. korshinskii, H. scoparium, and A. ordosica, respectively, when the rainfall intensities ranged from 1.15, 2.31, 3.46, 4.61, 6.92, 9.23 to 11.53 mm h-1. The needle-leaved species A. ordosica had a higher canopy water storage capacity than the ovate-leaved species C. korshinskii and H. scoparium at the same magnitude of rainfall intensity, except for C. korshinskii when it was expressed in unit of canopy projection area. Consequently, A. ordosica will generate higher interception losses as compared to C. korshinskii and H. scoparium. This is especially the case as it often forms dense dwarf shrub communities despite its small size.

Wang, Xin-ping; Zhang, Ya-feng; Hu, Rui; Pan, Yan-xia; Berndtsson, Ronny

2012-08-01

342

Nearshore Areas Used by Fry Chinook Salmon, Oncorhynchus tshawytscha, in the Northwestern Sacramento–San Joaquin Delta, California  

E-print Network

San Joaquin Delta in winter 2001 Catch Rate (number/minute)rates of Chinook salmon fry, Oncorhynchus tshawytscha, in different substrata and nearshore zones in the northwestern Sacramento- San Joaquin Delta

McLain, Jeff; Castillo, Gonzalo

2009-01-01

343

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2013 CFR

33 Navigation and Navigable Waters 2 2013-07-01 2013-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2013-07-01

344

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2012 CFR

33 Navigation and Navigable Waters 2 2012-07-01 2012-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2012-07-01

345

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2011 CFR

33 Navigation and Navigable Waters 2 2011-07-01 2011-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2011-07-01

346

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2014 CFR

33 Navigation and Navigable Waters 2 2014-07-01 2014-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2014-07-01

347

Northwestern University Archives Evanston, Illinois Melvin A. Pingree (1845-1866) Photograph Album, circa 1865-1866  

E-print Network

secretary to James Harlan, then Andrew Johnson's Secretary of the Interior. Pingree died of yellow fever of typhoid fever on July 10, 1864, barely two months after enlisting. 6 Unknown Unmarked N/A #12;Northwestern

348

33 CFR 165.1301 - Puget Sound and Adjacent Waters in Northwestern Washington-Regulated Navigation Area.  

Code of Federal Regulations, 2010 CFR

33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Puget Sound and Adjacent Waters in Northwestern Washington-Regulated...165.1301 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF...

2010-07-01

349

Structural relationship of the Beartooth Mountains and Big Horn basin in south-central Montana and northwestern Wyoming  

SciTech Connect

Geologic structure along the Beartooth Mountain front and adjacent Big Horn basin in south-central Montana and northwestern Wyoming has been the subject of considerable debate for many years. Directional drilling by Amoco Production Company, located on the northeast corner of the Beartooth block, indicates three things. (1) Western Big Horn basin Paleozoic and Mesozoic sections recumbently folded 2 mi (3.2 km) under the northeast corner of the Beartooth block, measured horizontally from the surface exposure of the Beartooth fault. (2) The main Beartooth fault dips 19{degrees} northwest at a depth of 8,300 to 8,400 ft (2,530 to 2,560 km), 1 mi (1.6 km) from the surface exposure of the main Beartooth fault. (3) The main Beartooth fault appears to be a component of a complex fault system which horizontally displaces and faults-out formations in both the Paleozoic and Mesozoic section on the upper limb of the recumbent fold. In addition to the drilling data, interior Beartooth Mountain faults, with dominant northeast and east-west structural orientation, show reactivation of left-lateral movement, intersecting the Beartooth front and offsetting Paleozoic and Mesozoic sections 1-2 mi (1.6-3.2 km) horizontally. Reactivation of some of these faults seems to coincide with the intrusion of Tertiary (Eocene ) igneous bodies along some of the same structural trends. Beartooth front fold orientation and fault movement correlated with a reexamination of internal block fault systems lend additional weight to the argument of horizontal compression as a major factor in late Laramide formation of geologic structure along the northeast face of the Beartooth Mountains.

Clark, D.M. (Exodus-Exploration Inc., Billings, MT (United States))

1991-06-01

350

Diagenetic history of the Korallenoolith (Malm) of northwestern Germany: Implications from in-situ trace element and isotopic studies  

NASA Astrophysics Data System (ADS)

We have collected rock samples from the abandoned Konrad iron ore mine near Salzgitter/Germany, to elucidate the diagenetic history of the Korallenoolith formation in northwestern Germany. Petrographic and cathodoluminescence investigations showed that the rocks contain a wide range of particles, from primary biogenic material to various generations of interparticle cements and cements in fissures and fractures. The diagenetic environment of cement precipitation was reconstructed using in-situ trace element microanalyses with PIXE, using the Bochum proton microprobe. Furthermore, the different components were analysed for their radiogenic ( 87Sr/ 86Sr) isotope signatures. 'Rim cements' around echinoid fragments display several stages of cement precipitation. Early cement generations show high Sr concentrations and low 87Sr/ 86Sr values. In contrast, later generations have relatively low Sr values, around 300 ppm, and iron concentrations of up to 3%. Fissure cements represent an even later stage of diagenetic history. They consist of calcite, anhydrite and celestite and are characterised by significantly higher 87Sr/ 86Sr values. The results of combined trace element and isotopic measurements indicate that the biogenic material was deposited in a shallow marine environment with normal salinity and a relatively high primary availability of iron. The early generations of diagenetic cements have similar, marine, signatures and were therefore precipitated in a closed system, where the trace element and isotopic properties were inherited from the dissolved precursor phases. In contrast, the later generations of rim cements and particularly the fissure cements show completely different and variable chemical signatures. They were precipitated in an open system from formation waters.

Bruhn, Frank; Veizer, Ján; Buhl, Dieter; Meijer, Jan

2005-04-01

351

Tissue Distribution of Selenium and Effect of Season and Age on Selenium Content in Roe Deer from Northwestern Poland  

Microsoft Academic Search

The aim of the study was to compare selenium concentrations in different organs of roe deer from northwestern Poland. Samples\\u000a of liver, kidneys, heart and lungs, collected from 74 roe deer shot during the hunting seasons of 2008–2009 in northwestern\\u000a Poland, were studied. Selenium concentration in the organs was determined spectrofluorimetrically. Mean selenium concentration\\u000a was 0.06 µg\\/g w.w. in the liver,

Bogumi?a Pilarczyk; Agnieszka Tomza-Marciniak; Renata Pilarczyk; Diana Hendzel; Barbara B?aszczyk; Ma?gorzata B?kowska

2011-01-01

352

ISPOL weather conditions in the context of long-term climate variability in the north-western Weddell Sea  

Microsoft Academic Search

At the transition from austral spring to summer of 2004\\/2005, the field experiment Ice Station Polarstern (ISPOL) took place in the north-western Weddell Sea to observe physical and biological atmosphere–sea ice–ocean processes. The objective of this paper is to discuss the meteorological conditions during ISPOL in the context of long-term climate variability mainly in the north-western Weddell Sea region. This

Jörg Bareiss; Klaus Görgen

2008-01-01

353

Volcán Las Navajas, a Pliocene-Pleistocene trachyte\\/peralkaline rhyolite volcano in the northwestern Mexican volcanic belt  

Microsoft Academic Search

Volcán Las Navajas, a Pliocene-Pleistocene volcano located in the northwestern portion of the Mexican volcanic belt, erupted lavas ranging in composition from alkali basalt through peralkaline rhyolite, and is the only volcano in mainland Mexico known to have erupted pantellerites. Las Navajas is located near the northwestern end of the Tepic-Zacoalco rift and covers a 200-m-thick pile of alkaline basaltic

Stephen A Nelson; Joann Hegre

1990-01-01

354

Quality of ground water in Routt County, northwestern Colorado  

USGS Publications Warehouse

Chemical and bacteriological data were collected to describe the quality of water from selected geologic units in Routt County, Colo. Calcium bicarbonate was the dominant water-chemistry type; magnesium, sodium, and sulfate frequently occurred as codominant ions. Specific conductance values ranged from 50 to 6,000 micromhos. Mean values of specific conductance, dissolved solids , and hardness from the sampled aquifers were generally greatest in waters from the older sedimentary rocks of the Lance Formation, Lewis Shale, Mesaverde Group, and Mancos Shale, and least in the ground waters from the alluvial deposits, Browns Park Formation, and the basement complex. Correlations of specific conductance with dissolved solids and specific conductance with hardness were found within specified concentration ranges. On the basis of water-quality analyses, water from the alluvial desposits, Browns Park Formation, and the basement complex generally is the most suitable for domestic uses. Chemical constituents in water from wells or springs exceeded State and Federal standards for public-water supplies or State criteria for agricultural uses were pH, arsenic, boron, chloride, iron, fluoride, manganese, nitrite plus nitrate, selenium, sulfate, or dissolved solids. Total-coliform bacteria were detected in water from 29 sites and fecal-coliform bacteria were detected in water from 6 of the 29 sites. (USGS)

Covay, Kenneth J.; Tobin, R.L.

1980-01-01

355

This Provisional PDF corresponds to the article as it appeared upon acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon.  

E-print Network

This Provisional PDF corresponds to the article as it appeared upon acceptance. Fully formatted PDF (choudhar@ece.northwestern.edu) ISSN 1687-4153 Article type Research Submission date 9 December 2010 Acceptance date 29 February 2012 Publication date 29 February 2012 Article URL http

356

Abundances of northwestern salamander larvae in montane lakes with and without fish, Mount Rainier National Park, Washington  

USGS Publications Warehouse

In Mount Rainier National Park, the northwestern salamander usually inhabits relatively large and deep lakes and ponds (average size = 0.3 ha; average depth > 2 m) that contain flocculent, organic bottom sediments and abundant coarse wood. Prior to 1970, salmonids were introduced into many of the park's lakes and ponds that were typical habitat of the northwestern salamander. The objective of this study was to compare, in lakes and ponds with suitable habitat characteristics for northwestern salamanders, the observed abundances of larvae in takes and ponds with and without these introduced salmonids. Day surveys of 61 lakes were conducted between 1993 and 1999. Fish were limited to takes and ponds deeper than 2 in. For the 48 lakes and ponds deeper than 2 in (i.e., 25 fishless lakes and 23 fish lakes), the mean and median observed abundances of northwestern salamander larvae in fishless lakes and ponds was significantly greater than the mean and median observed abundances of larvae in lakes and ponds with fish. Northwestern salamander larvae were not observed in 11 fish lakes. These lakes were similar in median elevation, surface area, and maximum depth to the fishless lakes. The 12 fish lakes with observed larvae were significantly lower in median elevation, larger in median surface area, and deeper in median maximum depth than the fishless lakes. Low to null observed abundances of northwestern salamander larvae in lakes and ponds with fish were attributed to a combination of fish predation of larvae and changes in larval behavior.

Larson, Gary L.; Hoffman, Robert L.

2002-01-01

357

The Hei River Basin in northwestern China - tectonics, sedimentary processes and pathways  

NASA Astrophysics Data System (ADS)

The Hei River Basin (catchment area of c. 130,000 km²) is situated at the transition between the northern margin of the Tibetan Plateau and the southern slopes of Gobi-Tien-Shan. As part of the northwestern Chinese deserts, the Ejina Basin (Gaxun Nur Basin) constitutes the endorheic erosion base of the drainage system. The basin - hosting the second largest continental alluvial fans in the world, is tectonically strongly shaped by the Gobi belt of left-lateral transpression. The tectonic setting in combination with competing climatic driving forces (Westerlies and summer/winter monsoon currents) has supported the formation of a valuable long-time sediment archive comprises at least the last 250,000 yrs. of deposition. It is composed by the interplay of eolian, fluvial and lacustrine sedimentation cycles and today is dominated by widespread (gravel) gobi surfaces, insular dune fields and shallow evaporitic playa areas. Thus, it provides excellent conditions to investigate tectonic evolution and Quaternary environmental changes. Recently, geomorphological, geophysical, neotectonic and mineralogical studies have enhanced the understanding of the environmental history and the modern depositional environment. Moreover, the role of the Hei River Basin as an important source area of silt particles which were later deposited on the Chinese Loess Plateau is evaluated. Therefore, a 230 m long drill core, sediment sections and ca. 700 surface samples throughout the whole catchment and basin were analyzed. Instrumental and historical seismicity are very low, but the proximity to active fault zones and dating irregularities in earlier publications indicate evidence for deformation in the study area. Despite flat topography, indications of active tectonics such as fault-related large-scale lineations can be observed. Seismically deformed unconsolidated lacustrine deposits (seismites), presumably of Holocene age, are evident and must be related to the nearby faults. The upper catchment is represented by the Qilian Shan mountain range and its immediate foreland. Here, a tripartite altitudinal distribution of terrestrial sediment archives is evident, which is representative of catchment-wide sedimentological processes. Insights into their formation mechanisms, therefore, add valuable perspective regarding the reconstruction of sedimentological and paleoenvironmental conditions in the depositional area of the Hei River Basin. For the characterization of provenance and dispersal of Quaternary sediments in relation to the modern depositional environment, over 200 surface samples from the whole catchment were analyzed using XRD and XRF measurements on the clay fractions, heavy minerals and bulk sediments. The clay mineral results in-particular show that it is possible to discriminate between the chlorite rich metamorphic sediments originating from greenschist bearing rocks in the Qilian Shan Mountain Range in the south, and the more intrusive rocks from the Bei Shan Mountain Range west of the Hei River Basin. Additionally, these two main sources reflect different transportation processes; the Qilian Shan sediments are mainly transported by the rivers Heihe and Beida He, and the deposition of the Bei Shan sediments is mainly driven by wind or local runoff. Grain size results of primary loess deposits indicate different eolian transport pathways, i.e., far-travelled dust input (medium silty) vs. local deflation from active fluvial channels (fine sandy). Along the altitudinal transect, the varying geomorphological settings exert a significant influence on the grain size composition showing an increased contribution of far-travelled dust at higher altitudes.

Rudersdorf, Andreas; Nottebaum, Veit; Schimpf, Stefan; Yu, Kaifeng; Hartmann, Kai; Stauch, Georg; Wünnemann, Bernd; Reicherter, Klaus; Diekmann, Bernhard; Lehmkuhl, Frank

2014-05-01

358

Is There any Relationship Between the Santa Elena Depression and Chicxulub Impact Crater, Northwestern Yucatan Peninsula, Mexico?  

NASA Astrophysics Data System (ADS)

The Terminal Cretaceous Chicxulub Impact Crater had a strong control on the depositional and diagenetic history of the northern Yucatan Platform during most of the Cenozoic Era. The Chicxulub Sedimentary Basin (henceforth Basin), which approximately coincides with the impact crater, is circumscribed by a concentration of karstic sinkholes known as the Ring of Cenotes. Santa Elena Depression (henceforth Depression) is the name proposed for the bowl-shaped buried feature, first contoured by geophysical studies, immediately south of the Basin, in the area where the Ticul 1 and UNAM 5 wells were drilled. Lithologic, petrographic, and biostratigraphic data on PEMEX, UNAM, and ICDP cores show that: 1) Cenozoic deposits are much thicker inside the Basin than inside the Depression, 2) in general, the Cenozoic formations from inside the Depression are the thickest among those outside the Basin, 3) variably dolomitized pelagic or outer-platform wackestone or mudstone occur both inside the Basin and Depression, 4) the age of the deeper-water sedimentary carbonate rocks is Paleocene-Eocene inside the Basin and Paleocene?-Early Eocene inside the Depression, 5) the oldest formations that crop out are of Middle Eocene age at the edge of the Basin and Early-Middle Eocene age inside the Depression, 6) saline lake deposits, that consist chiefly of anhydrite, gypsum, and fine carbonate, and also contain quartz, chert, clay, zeolite, potassium feldspar, pyrite, and fragments of wood, are present in the Cenozoic section of the UNAM 5 core between 282 and 198 m below the present land surface, 7) the dolomite, subaerial exposure features (subaerial crusts, vugs, karst, dedolomite), and vug-filling cement from the Eocene formations are more abundant inside the Depression than inside the Basin. The depositional environments that are proposed for explaining the Cenozoic facies succession within the Santa Elena Depression are: 1) deeper marine water (Paleocene?-Early Eocene), 2) relatively isolated saline lake (Middle Eocene), and 3) shallow marine water (Middle-Late Eocene?). In places, the deeper-water facies are similar to those within the Chicxulub Sedimentary Basin. The shallow-water facies is similar to those occurring outside the Basin. In general, quartz and silicates are rare in the Cenozoic sedimentary carbonate of the northwestern Yucatan Peninsula. Therefore, their presence in the UNAM 5 core could be attributed to either impact breccia reworking or silicic volcanic processes. Quartz, chert, zeolite, and clay also are common in the suevite breccia of both Yax-1 and UNAM 5 cores. The fact that the Santa Elena Depression was a distinct sedimentary basin during much of the Paleogene could be explained by any or a combination of the following hypotheses: 1) In spite of being located outside the cenote ring, the Depression is a sub-basin of the larger and deeper Chicxulub Sedimentary Basin and is therefore located within the Chicxulub Impact Crater, 2) the Depression coincides with an impact crater distinct from the Chicxulub Impact Crater, 3) the Depression formed after the Chicxulub bolide impact due to slumping, crater wall failure, or larger-scale tectonic processes. The lack of conclusive evidence for multiple impact breccia layers in the northwestern Yucatan Peninsula, corroborated with the presence on top of the impact breccia from UNAM 5 core of deeper-water limestone similar to that of Late Paleocene-Early Eocene age from Yax-1 core, would be more consistent with either the first or third hypothesis.

Lefticariu, L.

2005-05-01

359

Identification and molecular characterization of Theileria sp. infecting red deer ( Cervus elaphus ) in northwestern Poland  

Microsoft Academic Search

Piroplasms from Theileria genus were detected in blood and spleen of red deer Cervus elaphus culled during the months of September 2004–January 2005 in northwestern Poland. The polymerase chain reaction revealed the\\u000a presence of Theileria deoxyribonucleic acid in 88% (36 of 41) of the animals examined. Molecular characterization of the parasites based on large\\u000a piece of 18S ribosomal ribonucleic acid

Marek Sawczuk; Agnieszka Maciejewska; Bogumi?a Skotarczak

2008-01-01

360

Serological Survey of Toxoplasma gondii Infection Among Slaughtered Pigs in Northwestern Taiwan  

Microsoft Academic Search

A serological survey of Toxoplasma gondii infection among slaughtered pigs in the largest slaughterhouse located in Taoyuan County of northwestern Taiwan was conducted using the latex agglu- tination (LA) test during 1998. The overall seroprevalence of T. gondii infection was 28.8% (32\\/111) with LA titers of 1:32 (6, 18.8%), 1:64 (10, 31.2%), 1:128 (9, 28.1%), 1:256 (6, 18.8%), and 1:512

Chia-Kwung Fan; Kua-Eyre Su; Yu-Jen Tsai

2004-01-01

361

Characterization of Ambient Fine Particles in the Northwestern Area and Anchorage, Alaska  

Microsoft Academic Search

Ambient PM2.5 (particulate matter less than 2.5 ?m in aerodynamic diameter) in the northwestern United States and Alaska is dominated by carbonaceous compounds associated with wood burning and transportation sources. PM2.5 source characterization studies analyzing recent PM2.5 speciation data have not been previously reported for these areas. In this study, ambient PM2.5 speciation samples collected at two monitoring sites located

Eugene Kim; Philip K. Hopke; Devin Berg; James Schauer; Chia-Wei Tsai; Chang-Tang Chang; Chyow-San Chiou; Je-Lueng Shie; Yu-Min Chang; H. Frey; Kangwook Kim; Shih-Hao Pang; William Rasdorf; Phil Lewis; William Faulkner; Bryan Shaw; Tom Grosch; Rhona Julien; Jonathan Levy; Gary Adamkiewicz; Russ Hauser; John Spengler; Robert Canales; H. Hynes; Thomas Stock; Maria Morandi; Masoud Afshar; Kuenja Chung; Phirun Saiyasitpanich; Tim Keener; Mingming Lu; Fuyan Liang; Soon-Jai Khang; Kang-Shin Chen; Hsin-Kai Wang; Yen-Ping Peng; Wen-Cheng Wang; Chia-Hsiu Chen; Chia-Hsiang Lai; Le Nghiem; Nguyen Oanh; Michelle Bergin; Armistead Russell; Mehmet Odman; Daniel Cohan; William Chameides; Chang-Fu Wu; Ching-Hui Chen; Shih-Ying Chang; Pao-Erh Chang; Ruei-Hou Shie; Lung-Yu Sung; Jen-Chih Yang; Jen-Wei Su

2008-01-01

362

Bacterivory in the northwestern Indian Ocean during the intermonsoon – northeast monsoon period  

Microsoft Academic Search

Bacterial grazing loss rates were studied by radioactive labeling of natural bacteria with L-(4,5-3H) leucine and from the rate of disappearance of bacterial cells in the northwestern Indian Ocean. Bacterivory was measured in a mixed sample that had been combined from various depths across the euphotic zone. Experiments were performed on 26 occasions at 19 stations in the Gulf of

Thomas Weisse

1999-01-01

363

Geology and exploration in southwest Pacific Australian region: Western and Northwestern Margin basins of Australia  

Microsoft Academic Search

The Marginal basins of Western and Northwestern Australia extend approximately 3,800 km along the coast and comprise both continental shelf and adjacent deepwater plateau areas. From north to south, the principal basins are the Sahul\\/Malita, Browse, Carnarvon, and Perth basins. The stratigraphic sequence within each basin is broadly similar, with initial widespread Triassic-Early Jurassic deposition in broad regional pre-rift sags.

1991-01-01

364

Morphological analysis of alpine communities of the north-western Caucasus  

Microsoft Academic Search

The species composition of four alpine communities in the north-western Caucasus was subjected to a morphological analysis.\\u000a The communities are an alpine lichen heath type (ALH), aFestuca varia grassland type (FVG), aGeranium-Hedysarum meadow type (GHM) and a snowbed community (SBC). Eighty-two species were studied, using the following morphological parameters:\\u000a vegetative mobility, presence of rosettes, architectural model, life form according toRaunkiaer

Galina A. Pokarzhevskaya

1995-01-01

365

Bedrock incision, rock uplift and threshold hillslopes in the northwestern Himalayas  

Microsoft Academic Search

The topography of tectonically active mountain ranges reflects a poorly understood competition between bedrock uplift and erosion. Dating of abandoned river-cut surfaces in the northwestern Himalayas reveals that the Indus river incises through the bedrock at extremely high rates (2-12 mm yr-1). In the surrounding mountains, the average angles of hillslopes are steep and essentially independent of erosion rate, suggesting

Douglas W. Burbank; John Leland; Eric Fielding; Robert S. Anderson; Nicholas Brozovic; Mary R. Reid; Christopher Duncan

1996-01-01

366

Reconstruction and climatic interpretation of a late Pleistocene peat deposit in northwestern Oregon  

Microsoft Academic Search

Summary 1 Climatic models predict that postglacial conditions in the Pacific Northwest of North America (between 11'000 and 10'000 years BP) were about 2-3 °C cooler than at present. These models were tested by examining plant macrofossils and insect remains in a late Pleistocene peat deposit in northwestern Oregon. 2 Stratigraphy in trenches (540 cm depth) revealed peat from 225

GEORGE O. POINAR; ROBSON BONNICHSEN; CLIFFORD HEDLUND

367

“Berry Patch” As a Kind of Place—the Ethnoecology of Black Huckleberry in Northwestern Canada  

Microsoft Academic Search

The Gitksan and Wet’suwet’en of Northwestern British Columbia formerly used landscape burning to manage patches of black huckleberry\\u000a (Vaccinium membranaceum), the most important plant resource of their seasonal round. In view of its significance one might postulate that managed\\u000a sites would conform to a biophysical or ecological type to maximize return for effort. However, a survey of a number of

Scott Trusler; Leslie Main Johnson

2008-01-01

368

NEST-SITE CHARACTERISTICS OF HAMMOND'S AND PACIFIC SLOPE FLYCATCHERS IN NORTHWESTERN CALIFORNIA1  

Microsoft Academic Search

Thirty nests of Hammond's (Empidonax hammondii) and 88 nests of Pacific- slope (E. difficilis) Flycatchers were located in different-aged Douglas-fir (Pseudotsuga men- ziesii)\\/tanoak (Lithocarpus densiflorus) dominated forests at 12 study sites in northwestern California during the breeding seasons of 1984, 1985, 1987, and 1988. In contrast to Pacific- slope Flycatchers, Hammond's used nest trees that averaged two to three times

HOWARD F. SAKAI; BARRY R. NOON

369

Trace Element Concentrations and Bioindicator Responses in Tree Swallows from Northwestern Minnesota  

Microsoft Academic Search

Extremely high concentrations of cadmium (3.5 ?g\\/g dry wgt.) and elevated concentrations of chromium (>10 ?g\\/g dry wgt.) and mercury (1.6 ?g\\/g dry wgt.) were reported in waterbird tissues at Agassiz National Wildlife Refuge in northwestern Minnesota in 1994. Tree\\u000a swallows (Tachycineta bicolor) were studied during 1998–2001 at three drainages into the Refuge, two pools on the Refuge, and at

Christine M. Custer; Thomas W. Custer; David Warburton; David J. Hoffman; John W. Bickham; Cole W. Matson

2006-01-01

370

Upper Cretaceous Foraminifera from southern California and northwestern Baja California, Mexico  

E-print Network

CALIFORNIA, MEXICO WILLIAM V. SUTER Esso Production Research Company, Houston, Texas The University of Kansas Paleontological Institute HAROLD NORMAN FISK MEMORIAL PAPERS Humble Oil & Refining Company THE UNIVERSITY OF KANSAS AUGUST 16, 1968 THE UNIVERSITY... OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS Serial Number 49—Protozoa, Article 7, Pages 1-141, Figures 1-9, Plates 1-24, Tables 1-15 UPPER CRETACEOUS FORAMINIFERA FROM SOUTHERN CALIFORNIA AND NORTHWESTERN BAJA CALIFORNIA, MEXICO WILLIAM V. SLITER Esso Production...

Sliter, W. V.

1968-08-16

371

Temporal and spatial flux changes of radiolarians in the northwestern Pacific Ocean during 1997–2000  

Microsoft Academic Search

In order to examine the radiolarian fluxes and evaluate their relationship to the physical and biological environments, time-series sediment traps were deployed at three stations (Stations 50N, KNOT, and 40N) in the northwestern North Pacific from 1997 to 2000. Station 50N (50°N, 165°E, 3260m) is located in the center of Western Subarctic Gyre (WSAG); Station KNOT (44°N, 155°E, 2957m) is

Yusuke Okazaki; Kozo Takahashi; Jonaotaro Onodera; Makio C. Honda

2005-01-01

372

The extent of Greater India, II. Palaeomagnetic data from the Ladakh Intrusives at Kargil, northwestern Himalayas  

Microsoft Academic Search

The Ladakh Intrusives at Kargil (central Ladakh, northwestern Himalayas), immediately north of the Indus-Tsangpo suture zone, have been studied palaeomagnetically. These intrusives were emplaced before and during the early Tertiary with final closure of the isotopic systems between 49 and 45 m.y. ago. Six different magnetization components have been identified, on basis of which a two-stage collision model is proposed.

Chris Klootwijk; Madan Lal Sharma; Jozef Gergan; Biras Tirkey; S. K. Shah; Vinod Agarwal

1979-01-01

373

Selenium concentrations of common weeds and agricultural crops grown in the seleniferous soils of northwestern India  

Microsoft Academic Search

The plants grown in seleniferous soils constitute a major source of toxic selenium levels in the food chain of animals and human beings. Greenhouse and field experiments were conducted to study selenium concentrations of weeds, forages and cereals grown on seleniferous soils located between 31.0417° to 31.2175° N and 76.1363° to 76.4147° E in northwestern India. Eleven winter season (November–April)

Karaj S. Dhillon; Surjit K. Dhillon

2009-01-01

374

Manifestation of the gothenburg geomagnetic field excursion in sediments on the northwestern Central Russian Upland  

NASA Astrophysics Data System (ADS)

A paleomagnetic study of sediments at the Baranova Gora and Podol III/1 archaeological sites, located near Lake Volgo on the northwestern Central Russian Upland (56.9°N, 33.2°E), was performed. The paleomagnetic studies at both sites for the first time revealed the development of the Gothenburg geomagnetic excursion (dated 13000-12350 BP) in this region. This made it possible to specify the time interval when the Alleroed climatic phase started developing on the Central Russian Upland.

Gus'kova, E. G.; Raspopov, O. M.; Dergachev, V. A.; Iosifidi, A. G.; Sinitsyna, G. V.

2012-09-01

375

Mechanical characteristics of folds in Upper Cretaceous strata in the Disturbed Belt of northwestern Montana  

E-print Network

Directed by: Dr. David W. Stearns Folds in the southern Disturbed Belt (Laramide age) of northwestern Montana are described with a view toward the mechan- ical behavior of the rocks during folding. The folds are developed in the Telegraph Creek... rock bounded by bedding and macrofractures are small. The Virgelle Sandstone was the controlling member of the folding process because of its (1) relatively brittle behavior, (2) lithology, continuity and thickness, (3) wavelength...

Gilbert, Pat Kader

2012-06-07

376

Late Holocene faulting and earthquake recurrence in the Reelfoot Lake area, northwestern Tennessee  

Microsoft Academic Search

Faults, folds, and sand dikes have been identified in late Holocene sediments exposed in an exploratory trench excavated across Reelfoot scarp in northwestern Tennessee. In excess of 3 m of vertical displacement believed to be of deep-seated origin occurs across a 0.5-m-wide zone of east-dipping normal faults near the scarp base. The zone includes the only faults of probable tectonic

DAVID P. RUSS

1979-01-01

377

Was the Coppermine Homocline of northwestern Canada uplifted as part of a Middle Proterozoic forebulge  

SciTech Connect

Application of the principles of elastic plate bending to subsurface geometric information and outcrop in northwestern Canada suggests that Proterozoic crust was loaded and deflected during orogenic activity between about 1.6 and 1.1 Ga. Exposed Hudsonian (ca. 1.8-2.0 Ga) basement separating younger but coeval stratigraphic sequences in the Coppermine Homocline on the west and Bathurst Inlet on the east can be explained as a forebulge associated with the loading.

Cook, F.A. (Univ. of Calgary, Alberta (Canada))

1991-01-01

378

Lapse time and frequency-dependent attenuation characteristics of coda waves in the Northwestern Himalayas  

Microsoft Academic Search

We analyzed the local earthquakes waveform recorded on a broadband seismic network in the northwestern Himalayan Region to\\u000a compute lapse time and frequency dependence of coda Q (Q\\u000a c). The observed Q\\u000a c values increase with increasing lapse time at all frequency bands. The increase in Q\\u000a c values with lapse time is attributed to an increase in Q\\u000a c

S. Mukhopadhyay; C. Tyagi

2007-01-01

379

Fish assemblage structure on a drowned barrier island in the northwestern Gulf of Mexico  

Microsoft Academic Search

We investigated the assemblage structure of fishes associated with different habitats (inshore mud, shell bank, and offshore\\u000a mud) over a drowned barrier island, Freeport Rocks Bathymetric High, on the inner continental shelf of the northwestern Gulf\\u000a of Mexico (NW Gulf). Density data from otter trawls were used to examine spatial (habitat and site) and temporal differences\\u000a in fish assemblage structure

R. J. David Wells; J. O. Harper; J. R. Rooker; A. M. Landry Jr; T. M. Dellapenna

2009-01-01

380

Reconstructing the historical trophic status of northwestern Pennsylvania lakes using GIS  

Microsoft Academic Search

From each of 46 watersheds in glaciated northwestern Pennsylvania we estimated phosphorus export (kg P\\/ha\\/yr) from weekly\\u000a or twice-weekly measured stream phosphorus concentrations and measured stream discharges, and determined land covers using\\u000a GIS. Simple and step-down multiple regression analyses yielded models that explained 24% of the variation in P export using\\u000a land cover within whole watersheds, and 64% of the

M. L. Ostrofsky; C. P. Bradley

2006-01-01

381

Vertical distribution and temporal variation of dissolved organic carbon in the North-Western Mediterranean Sea  

Microsoft Academic Search

During 1991 and 1992, detailed vertical profiles of dissolved organic carbon (DOC) content were obtained monthly, in the North-Western Mediterranean at the DYFAMED-1 site (43°25'N, 07°52'E). DOC was measured using a high temperature catalytic oxidation method. In the 150-2000 m layer, DOC distribution was quite uniform, with a content of about 0.6--0.7 mg C 1-1. In surface waters, DOC concentration

G. Copinmontegut; BERNARD AVRIL

1993-01-01

382

Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea  

Microsoft Academic Search

Methane seeps in the northwestern Black Sea are accompanied by carbonate and pyrite precipitates. Sediments were sampled at locations on the Romanian (120m depth) and Ukrainian (180–200m depth) shelf and slope. Layered carbonate crusts are formed of (i) carbonate-cemented siliciclastic sediment containing dreissenoid bivalves, (ii) microcrystalline high-Mg-calcite or aragonite, and (iii) aragonitic cement. The Dreissena sediment is subrecent and was

J Peckmann; A Reimer; U Luth; C Luth; B. T Hansen; C Heinicke; J Hoefs; J Reitner

2001-01-01

383

Basin scale distribution of zooplankton in the Ligurian Sea (north-western Mediterranean) in late autumn  

Microsoft Academic Search

Mesozooplankton biomass and abundance were evaluated in epipelagic waters at 59 stations covering the Italian sector of the\\u000a Ligurian Sea (north-western Mediterranean) in December 1990. This region is characterised by a cyclonic circulation which\\u000a encloses a central divergence zone and is associated with a main thermohaline front offshore the western Ligurian coast. At\\u000a the end of autumn, mesozooplankton biomass (range:

P. Licandro; P. Icardi

2009-01-01

384

Newly found submerged reefs on the Miyako-Sone platform, Ryukyu Arc, northwestern Pacific  

NASA Astrophysics Data System (ADS)

Bathymetric mapping and observations of the seafloor using a remotely operated vehicle were carried out on the top of the Miyako-Sone submarine platform, northeast of Miyako-jima, Ryukyu Islands, northwestern Pacific. The high-resolution bathymetric map provides a detailed geomorphology and spatial distribution of submerged reefs and terraces on the platform. Our observations show that a submerged reef occurs at a water depth of ca. 55 m as a barrier reef that are up to 500 m across (from east to west) and 1,000 m lonng (from north to south) with a prominent ridge structure (reef crest). The submerged reef deepens westward from the crest along which spurs and grooves are well developed. A shallow lagoon extends on the east of the crest. Submersible observations confirm that the submerged reef now serves a hard substrate on which soft corals and algae grow. Terraces form at a water depth of ca. 110 m around a submerged reef on the northwestern Miyako-Sone platform. Submersible observations show the terrace surface is extensivbely covered with modern rhodoliths and living larger benthic foraminifers. Well-preserved coral-reef topography likely indicates limited sediment transportion from Miyako-jima and Okinwa-jima islands to the Miyako-Sone submarine platform. We plan to provide chronological constraint by direct sampling from the submerged reef and terraces, which enable to delineate a global deglacial sea-level history especially during early deglacial times in the northwestern Pacific.

Arai, K.; Matsuda, H.; Sasaki, K.; Machiyama, H.; Inoue, T.; Iryu, Y.

2013-12-01

385

Oil and gas seeps within Absaroka volcanics of northwestern Wyoming  

SciTech Connect

Three new occurrences of asphaltic, liquid, and gaseous hydrocarbons have been discovered in the southeastern Absaroka Range. These petroleum seeps are 40 to 110 mi southeast of previously known seeps within Eocene volcaniclastic rocks at Calcite Springs, Tower Junction, and Sweetwater Mineral Springs, Wyoming. The Middle Fork seep and Castle Rocks seep are near the headwaters of the Middle and North Forks of Owl Creek, respectively. The Chimney Rock asphalt locality is along the South Fork of the Wood River. Water samples from the Middle Fork seep fluoresce greenish-orange and contain 6 to 8 mg/L of extractable bituminous hydrocarbons. An iridescent oily film forms on the water surface and on abundant gas bubbles trapped within moss. The Castle Rocks seep, in Quaternary gravels along the bed of the North Fork of Owl Creek, shows iridescent oily bubbles in emerging spring water and black, sooty lenses of carbon-coated gravels in overlying dry deposits. The Middle Fork and Castle Rocks seeps rise through thin Quaternary deposits overlying the Aycross Formation (Eocene). The Chimney Rock asphalt locality is in a northwest-trending paleovalley fill consisting of highly deformed masses of volcanic strata in the Tepee Trail and Wiggins Formations. Thin (< 1 in. thick), discontinuous, subvertical veins of asphaltum cut through these rocks. These petroleum seeps demonstrate migration of hydrocarbons after the volcaniclastic strata were emplaced and suggest that significant petroleum resources may occur elsewhere within Eocene volcaniclastic rocks and/or within Mesozoic and Paleozoic reservoirs beneath the volcanics.

Sundell, K.A.; Love, J.D.

1986-08-01

386

Early Evidence of Acheulean Settlement in Northwestern Europe - La Noira Site, a 700 000 Year-Old Occupation in the Center of France  

PubMed Central

The human settlement of Europe during Pleistocene times was sporadic and several stages have been recognized, both from paleaoanthropological and archaeological records. If the first phase of hominin occupation (as early as 1.4 Ma) seems mainly restricted to the southern part of the continent, the second phase, characterized by specific lithic tools (handaxes), is linked to Acheulean settlements and to the emergence of Homo heidelbergensis, the ancestor of Neanderthals. This phase reached northwestern Europe and is documented in numerous sites in Germany, Great Britain and northern France, generally after 600 ka. At la Noira (Brinay, Central France), the Middle Pleistocene alluvial formation of the Cher River covers an archaeological level associated with a slope deposit (diamicton). The lithic assemblage from this level includes Large Cutting Tools (LCTs), flakes and cores, associated with numerous millstone slabs. The lithic series is classified as Acheulean on the basis of both technological and typological analyses. Cryoturbation features indicate that the slope deposits and associated archaeological level were strongly frozen and disturbed after hominin occupation and before fluvial deposition. Eight sediment samples were dated by the electron spin resonance (ESR) method and the weighted average age obtained for the fluvial sands overlying the slope deposits is 665±55 ka. This age is older than previous chronological data placing the first European Acheulean assemblages north of 45th parallel north at around 500 ka and modifies our current vision of the initial peopling of northern Europe. Acheulean settlements are older than previously assumed and the oldest evidences are not only located in southern Europe. La Noira is the oldest evidence of Acheulean presence in north-western Europe and attests to the possibility of pioneering phases of Acheulean settlement which would have taken place on a Mode 1-type substratum as early as 700 ka. The lithic assemblage from la Noira thus provides behavioral and technological data on early Acheulean occupation in Europe and contributes to our understanding of the diffusion of this tradition. PMID:24278105

Moncel, Marie-Hélène; Despriée, Jackie; Voinchet, Pierre; Tissoux, Hélène; Moreno, Davinia; Bahain, Jean-Jacques; Courcimault, Gilles; Falguères, Christophe

2013-01-01

387

Cenozoic tectonic evolution of the basin and range province in northwestern Nevada  

USGS Publications Warehouse

A regional synthesis of new and existing geologic and thermochronologic data document late Cretaceous - early Cenozoic regional erosion, Oligocene - Miocene volcanism, and subsequent late Miocene extension of the Basin and Range Province in northwestern Nevada and northeastern California. Across an ???220-km-wide region between the Santa Rosa and Warner Ranges, conformable sequences of 35 to 15 Ma volcanic rocks are cut by only a single generation of high-angle normal faults that accommodated ???23 km of total east-west extension (???12%). Fission-track, (U-Th)/He, geologic, and structural data from the Pine Forest Range show that faulting there began at 11 to 12 Ma, progressed at a relatively constant rate until at least 3 Ma, and has continued until near the present time. Extension in the Santa Rosa Range to the east took place during the same interval, although the post-6 Ma part of this history is less well constrained. Less complete constraints from adjacent ranges permit a similar timing for faulting, and we infer that extensional faulting in northwestern Nevada began everywhere at 12 Ma and has continued up to the present. Faulting in the Warner Range in northeastern California can only be constrained to have begun between 14 and 3 Ma, but may represent westward migration of Basin and Range extension during the Pliocene. Compared to the many parts of the Basin and Range in central and southern Nevada, extension in northwestern Nevada began more recently, is of lesser total magnitude, and was accommodated entirely by high-angle normal faults. Fission-track data document Late Cretaceous unroofing of Cretaceous (115 - 100 Ma) granitic basement rocks in northwestern Nevada, followed by a long period of relative tectonic quiescence that persisted through Oligocene and Miocene volcanism until the onset of Basin and Range extension at ???12 Ma. The low magnitude of extension (12%) and early Tertiary stability suggest that the modern ???31 km thick crust in northwestern Nevada was only slightly thicker (???35 km) prior to extension at 12 Ma, and was no thicker than ???38 km in the Late Cretaceous. This stands in contrast to other parts of the Basin and Range, where the crust was thickened to at least 45 to 50 km by Cretaceous thrusting and subsequently thinned to ???30 km by large magnitude (>50%) extension.

Colgan, J.P.; Dumitru, T.A.; Reiners, P.W.; Wooden, J.L.; Miller, E.L.

2006-01-01

388

A late Jurassic pterosaur (Reptilia, Pterodactyloidea) from northwestern Patagonia, Argentina  

NASA Astrophysics Data System (ADS)

A small to medium-sized pterodactyloid pterosaur (wingspan approximately 1.10 m) from the Upper Jurassic (middle-late Tithonian) marine deposits of the Vaca Muerta Formation of Patagonia (Los Catutos area, central Neuquén Province, Argentina) is reported. The specimen lacks the skull but constitutes a nearly complete postcranial skeleton, which includes cervical and dorsal vertebrae; a few thoracic ribs; both pectoral girdles; the left pelvic girdle; a proximal right wing (humerus, ulna, and radius) and metacarpal IV; a left wing that lacks only wing phalanx four; and both hindlimbs, the right one without the foot. Ontogenetic features suggest that the new fossil corresponds to a relatively mature individual, probably a subadult. Observed characters support its assignment to the Archaeopteroactyloidea, a basal clade within the Pterodactyloidea. This specimen is the second pterosaur from Los Catutos and the most complete Jurassic pterosaur so far known from South America.

Codorniú, Laura; Gasparini, Zulma; Paulina-Carabajal, Ariana

2006-03-01

389

Correlation of the Jurassic-Cretaceous siliceous-volcanogenic sediments in northwestern surroundings of the Pacific (Koryak Upland)  

NASA Astrophysics Data System (ADS)

In distribution areas of the Pekul’neiveem and Chirynai formations customary distinguishable in the Koryak Upland, complicated tectonostratigraphic units are composed of alternating thrust sheets of different lithologic composition and age, which are juxtaposed because of widespread thrust faulting, as is proved by the radiolarian analysis. Nineteen radiolarian assemblages of different age are first established here in the Lower Jurassic-Hauterivian succession of siliceous-volcanogenic sediments. In the Lower Jurassic interval, the lower and upper Hettangian, lower and upper Sinemurian, and Pliensbachian beds are recognized. Paleontological characterization is also presented for the Aalenian (or Toarcian?-Aalenian), upper Bajocian, lower and upper Bathonian, and Callovian beds of the Middle Jurassic. Within the Upper Jurassic, the Oxfordian-early Kimmeridgian, late Kimmeridgian-early Tithonian, Tithonian, and late Tithonian-early Berriasian radiolarian assemblages are distinguished. The late Berriasian-early Valanginian, middle-late Valanginian, and Hauterivian radiolarian assemblages are first recognized or compositionally revised. Radiolarians and lithofacies data are used to correlate the tectonostratigraphic units and individualize the jasper-alkali basaltic (lower Hettangian), chert-terrigenous (Hettangian-Sinemurian), jasper-cherty (Pliensbachian-Aalenian), jasper (Bajocian-Hauterivian), jasper-basaltic (upper Bajocian-Valanginian), Fe-Ti basaltic (upper Bajocian-Bathonian), tuffitejasper-basaltic (Bathonian-Hauterivian), and terrigenous-volcanogenic (Bajocian-Valanginian) sequences. The correlation results are extrapolated into other continental areas flanking the Pacific, i.e., to the western Kamchatka, northern and northwestern coastal areas of the Sea of Okhotsk, where the analogous radiolarian assemblages are characteristic of comparable allochthonous units of terrigenous-siliceous-volcanogenic sediments.

Vishnevskaya, V. S.; Filatova, N. I.

2008-12-01

390

Regolith Formation  

NSDL National Science Digital Library

In this three-part activity, learners use food to determine the effects of wind, sandblasting and water on regolith (dust) formation and deposition on Earth. Then, learners simulate regolith formation on the Moon by meteorite bombardment, an activity best completed outdoors.

Nasa

1997-01-01

391

Late Cretaceous to Middle Eocene Geological Evolution of the Northwestern Caribbean - Constraints from Cuban Data  

NASA Astrophysics Data System (ADS)

Cuba acts as the northwestern boundary of the Caribbean Sea. However it is not part of the Caribbean plate, its geological development is deeply related to the plate history. In fact, its Cretaceous volcanic arc rocks tightly correlate with coeval sections in Hispaniola and Puerto Rico, and the same probably occurs with the ophiolites. The early Palaeogene events in Cuba were also involved in the Caribbean plate history. In general, two principal structural levels can be distinguished in the geological structure of Cuba. The rocks belonging to the upper level (Eocene to Quaternary) are little disturbed and can be referred to as the cover. Below it occurs the great complex of the Cuban orogenic belt, which consists mainly of rocks of Jurassic to Eocene age. In addition, small outcrops of Proterozoic metamorphic rocks also occur in north central Cuba. The Palaeocene-Eocene section contains volcanic arc sequences in SE Cuba and northward thrusted piggy back and foreland basins in central and western Cuba. The Mesozoic rocks lies unconformably below. The contacts between the major Mesozoic elements are always tectonic. With the exception of the rocks of the passive Mesozoic margin of North America in northern Cuba, the remaining units represent tectonostratigraphic terranes extending parallel to the axis of the present main island of Cuba. The northernmost unit is the Mesozoic passive continental margin of North America. It consists of a Jurassic- Cretaceous mainly marine sedimentary sequence now exposed as a thrust and fold belt along the northern edge of the Cuban mainland. The other units are, from north to south: the Northern Ophiolitic Belt, the Volcanic Arc Terrane and the Southern Metamorphic Terranes. The ophiolites and the Cretaceous volcanic arc terranes belong to the Proto-Caribbean plate and were accreted to the palaeomargin during Late Cretaceous and early Palaeogene episodes. Some constrains to Caribbean plate origin and evolution according to data from Cuba: Ophiolites: 1- The age of the rocks of the northern ophiolite belt is Upper Jurassic-Albian. Oceanic lithosphere formation, at least in the "Cuban" Proto-Caribbean, ended in the Albian. Cretaceous volcanic arcs: 2- At least two volcanic arc Cretaceous sections are present in Cuba, separated in several regions by a mainly sedimentary Albian-Cenomanian section. The lower arc is probably of Aptian-Albian age. The Cenomanian (or Turonian?) -Campanian upper arc is calcalkalic and contains abundant sedimentary marine interbeds. 3- Some thin tuff beds are present in the southernmost deep water deposits of the North American palaeomargin in western and central Cuba in the Aptian-Cenomanian. This fact could be explained by a volcanic arc located several hundred km to the south of the NA palaeomargin. 4- Cretaceous volcanism ended during the early Campanian all along Cuba. Sedimentary upper Campanian and Maastrichtian sections rest on top of the older Cretaceous sections. Volcanism is only reassumed in SE Cuba (Turquino volcanic arc) late in the Danian. Southern metamorphic terranes: 5- The southern metamorphic terranes are a main feature in the geology of Cuba. They are continental blocks sharing many stratigraphic features with the NA palaeomargin of western Cuba (Guaniguanico mountains). As the last one area seems related to the Yucatan (Maya) block, some authors consider the metamorphic terranes as fragments of the Maya block that travelled to the west.

Cobiella, J.; Hueneke, H.; Meschede, M.; Sommer, M.

2006-05-01

392

Morphologic Map of Glacial and Periglacial Features in the Northwestern Argyre Basin, Mars  

NASA Astrophysics Data System (ADS)

Previous studies of morphologic features in the Argyre Basin suggested that they could have been formed by glacial processes [1,2,3]. Possible evidence for a past glaciation of the Argyre basin include landforms interpreted as e.g., eskers, drumlins, moraines and kettles [1]. Glacial features like lineated grooves, streamlined hills, U-shaped valleys and semicircular embayments (possible cirques) are consistent with extensive glacial modifications in the Argyre Basin [3]. For our study we chose a mountainous terrain in the northwestern part of Argyre basin (44°S - 48.5°S and 323.5°E - 329°E) to reinvestigate the glacial inventory and the history and evolution of glacial landforms and processes in this region with new, higher resolution image data. We produced a detailed morphologic map with 13 morphologic units based on High Resolution Stereo Camera (HRSC), Context Camera (CTX) and High Resolution Imaging Science Experiment (HiRISE) imagery. Large areas of the study region are covered with dissected and intact mantle material units. The smooth and flat mantle interpreted to be a dust/ice mantle [4] occurs in protected depressions or on southern, pole-facing slopes, which receive less insolation. Glacial/periglacial features (glaciers and viscous flow features) and fluvial features (gullies) are directly related to the dust/ice layer. Gullies are the most common fluvial features in the mapped area. They occur in areas where the mantle appears to be thick. The most obvious characteristics of the gullies are that they only erode into the dust/ice mantle and not the underlying bedrock, indicating a formation by melting of the water-ice-rich mantle [5]. The preferred orientation of the gullies is on poleward-facing slopes, where the dust/ice mantle is thickest. Often the gullies occur in conjunction with viscous flow features. Stratigraphically the gullies are one of the youngest landforms in the study region. Viscous flow features mostly occur between gullies and on dissected mantle material [6]. Often gully debris fans are superposed on this material. Other locations covered with viscous flow features include dust/ice mantle filled craters, where sediments in inclined craters have been deformed. A well-preserved glacier-like flow feature is located in the northernmost part of the mapping region. It shows well developed flow features (striae), which indicate an east to west flow direction with an average gradient of ~1,9°. The glacier is located in a protected area, almost completely surrounded by high mountains. Other possible glacial landforms such as pingo-like forms and polygonal terrains also occur on the dissected mantle material. Recent studies with HiRISE-data indicate a sequence from glaciation to ablation and perhaps subsequent periglacial processes [3]. We have investigated the relative stratigraphy of the morphologic units in our study region: (1) Glacial morphologies (viscous and glacier-like flow features) are superposed on mantle materials; (2) Morphologies formed by fluvial and periglacial processes (gullies, polygonal terrains, pingo-like forms), superpose or originate from glacial morphologies or mantle materials (dust/ice mantle); (3) Aeolian morphologies (various kinds of dunes, ripples) have a wide range of ages and overlie or were superposed by some periglacial morphologies. [1] Kargel, J. S. and Strom, R. G. (1992) Geology, 20, 3-7. [2] Hiesinger, H. and Head, J. W. (2002) PSS, 50, 939-981. [3] Banks, M. E. et al. (2008) JGR, 113, E12015, doi:10.1029/2007JE002994. [4] Mustard et al., (2001) Nature, 412, 411-414. [5] Christensen, P. R. (2003) Nature, 422, 45-47. [6] Milliken, R. E. et al. (2003) JGR, 108, doi:10.1029/ 2002JE002005.

Raack, Jan; Hiesinger, Harald; Reiss, Dennis

2010-05-01

393

Geologic Map of the Mount Trumbull 30' X 60' Quadrangle, Mohave and Coconino Counties, Northwestern Arizona  

USGS Publications Warehouse

The geologic map of the Mount Trumbull 30' x 60' quadrangle is a cooperative product of the U.S. Geological Survey, the National Park Service, and the Bureau of Land Management that provides geologic map coverage and regional geologic information for visitor services and resource management of Grand Canyon National Park, Lake Mead Recreational Area, and Grand Canyon Parashant National Monument, Arizona. This map is a compilation of previous and new geologic mapping that encompasses the Mount Trumbull 30' x 60' quadrangle of Arizona. This digital database, a compilation of previous and new geologic mapping, contains geologic data used to produce the 100,000-scale Geologic Map of the Mount Trumbull 30' x 60' Quadrangle, Mohave and Coconino Counties, Northwestern Arizona. The geologic features that were mapped as part of this project include: geologic contacts and faults, bedrock and surficial geologic units, structural data, fold axes, karst features, mines, and volcanic features. This map was produced using 1:24,000-scale 1976 infrared aerial photographs followed by extensive field checking. Volcanic rocks were mapped as separate units when identified on aerial photographs as mappable and distinctly separate units associated with one or more pyroclastic cones and flows. Many of the Quaternary alluvial deposits that have similar lithology but different geomorphic characteristics were mapped almost entirely by photogeologic methods. Stratigraphic position and amount of erosional degradation were used to determine relative ages of alluvial deposits having similar lithologies. Each map unit and structure was investigated in detail in the field to ensure accuracy of description. Punch-registered mylar sheets were scanned at the Flagstaff Field Center using an Optronics 5040 raster scanner at a resolution of 50 microns (508 dpi). The scans were output in .rle format, converted to .rlc, and then converted to ARC/INFO grids. A tic file was created in geographic coordinates and projected into the base map projection (Polyconic) using a central meridian of -113.500. The tic file was used to transform the grid into Universal Transverse Mercator projection. The linework was vectorized using gridline. Scanned lines were edited interactively in ArcEdit. Polygons were attributed in ArcEdit and all artifacts and scanning errors visible at 1:100,000 were removed. Point data were digitized onscreen. Due to the discovery of digital and geologic errors on the original files, the ARC/INFO coverages were converted to a personal geodatabase and corrected in ArcMap. The feature classes which define the geologic units, lines and polygons, are topologically related and maintained in the geodatabase by a set of validation rules. The internal database structure and feature attributes were then modified to match other geologic map databases being created for the Grand Canyon region. Faults were edited with the downthrown block, if known, on the 'right side' of the line. The 'right' and 'left' sides of a line are determined from 'starting' at the line's 'from node' and moving to the line's end or 'to node'.

Billingsley, George H.; Wellmeyer, Jessica L.

2003-01-01

394

Paleozoic-early Mesozoic gold deposits of the Xinjiang Autonomous Region, northwestern China  

USGS Publications Warehouse

The late Paleozoic-early Mesozoic tectonic evolution of Xinjiang Autonomous Region, northwestern China provided a favorable geological setting for the formation of lode gold deposits along the sutures between a number of the major Eastern Asia cratonic blocks. These sutures are now represented by the Altay Shan, Tian Shan, and Kunlun Shan ranges, with the former two separated by the Junggar basin and the latter two by the immense Tarim basin. In northernmost Xinjiang, final growth of the Altaid orogen, southward from the Angara craton, is now recorded in the remote mid- to late Paleozoic Altay Shan. Accreted Early to Middle Devonian oceanic rock sequences contain typically small, precious-metal bearing Fe-Cu-Zn VMS deposits (e.g. Ashele). Orogenic gold deposits are widespread along the major Irtysh (e.g. Duyolanasayi, Saidi, Taerde, Kabenbulake, Akexike, Shaerbulake) and Tuergen-Hongshanzui (e.g. Hongshanzui) fault systems, as well as in structurally displaced terrane slivers of the western Junggar (e.g. Hatu) and eastern Junggar areas. Geological and geochronological constraints indicate a generally Late Carboniferous to Early Permian episode of gold deposition, which was coeval with the final stages of Altaid magmatism and large-scale, right-lateral translation along older terrane-bounding faults. The Tian Shan, an exceptionally gold-rich mountain range to the west in the Central Asian republics, is only beginning to be recognized for its gold potential in Xinjiang. In this easternmost part to the range, northerly- and southerly-directed subduction/accretion of early to mid-Paleozoic and mid- to late Paleozoic oceanic terranes, respectively, to the Precambrian Yili block (central Tian Shan) was associated with 400 to 250 Ma arc magmatism and Carboniferous through Early Permian gold-forming hydrothermal events. The more significant resulting deposits in the terranes of the southern Tian Shan include the Sawayaerdun orogenic deposit along the Kyrgyzstan border and the epithermal and replacement deposits of the Kanggurtag belt to the east in the Chol Tagh range. Gold deposits of approximately the same age in the Yili block include the Axi hot springs/epithermal deposit near the Kazakhstan border and a series of small orogenic gold deposits south of Urumqi (e.g. Wangfeng). Gold-rich porphyry copper deposits (e.g. Tuwu) define important new exploration targets in the northern Tian Shan of Xinjiang. The northern foothills of the Kunlun Shan of southern Xinjiang host scattered, small placer gold deposits. Sources for the gold have not been identified, but are hypothesized to be orogenic gold veins beneath the icefields to the south. They are predicted to have formed in the Tianshuihai terrane during its early Mesozoic accretion to the amalgamated Tarim-Qaidam-Kunlun cratonic block.

Rui, Z.; Goldfarb, R.J.; Qiu, Y.; Zhou, T.; Chen, R.; Pirajno, F.; Yun, G.

2002-01-01

395

Northwestern Florida ecological characterization: An ecological atlas: Map narratives  

SciTech Connect

This study provides an atlas of ecological resources along the Big Bend and Panhandle coastline of Florida. The study area comprises 18 coastal counties, an area of 30,460 square kilometers (11,764 square miles). This atlas is designed to provide information and assist government and industry decisionmakers in coastal resource and environmental planning. In particular, results of this study will be utilized for the outer continental shelf oil and gas leasing program, in developing management plans for pipeline corridors, and onshore facilities planning. The production of this ecological atlas included four major tasks: the collection and synthesis of the latest available data on biological, socioeconomic, soil, oil and gas, hydrology, and climatological parameters; the assimilation of these data into a format which is compatible with the requirements of 1:100,000 scale mapping; the compilation of 90 ecological atlas maps; and the preparation of an atlas narrative serving to describe more fully the mapped parameters. This ecological atlas will embrace the habitat mapping study, the socioeconomic study, and the environmental synthesis being conducted for the study area.

Palik, T.F.; Kunneke, J.T.

1984-09-01

396

244 N. Feige et al.: New established breeding sites of the Barnacle Goose in North-western Europe Newly established breeding sites of the Barnacle Goose Branta  

E-print Network

244 N. Feige et al.: New established breeding sites of the Barnacle Goose in North-western Europe Newly established breeding sites of the Barnacle Goose Branta leucopsis in North-western Europe Graaf, K. Larsson, A. Leito, A. & J. Stahl 2008: Newly established breeding sites of the Barnacle Goose

Kleyer, Michael

397

Regional cloud characteristics over the tropical northwestern Pacific as revealed by Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar and TRMM Microwave Imager  

Microsoft Academic Search

The present study investigates regional cloud characteristics over the tropical northwestern Pacific using Tropical Rainfall Measuring Mission (TRMM) data sets such as rain rate, radar reflectivity, and passive microwave radiometer polarization corrected temperature (PCT). In particular, the tropical northwestern Pacific is divided into two surface rain maxima regions: the South China Sea (SCS) and the Philippine Sea (PS). The TRMM

Myung-Sook Park; Yong-Sang Choi; Chang-Hoi Ho; Chung-Hsiung Sui; Seon Ki Park; Myoung-Hwan Ahn

2007-01-01

398

Volcanic Features in the Northwestern Hawaiian Islands Revealed by SWATH Mapping  

NASA Astrophysics Data System (ADS)

The Northwestern Hawaiian Islands Coral Reef Ecosystem Reserve (NWHICRER) has only recently been established, and has already caused an infusion of interest and funds for studies to assess what is there to preserve and how best to do it. The Northwestern chain stretches over 2200 km to the northwest of the 775 km-long Main Hawaiian Islands (MHI). The MHI have only in recent years been systematically mapped with modern multibeam swath sonar systems and the work is not yet complete. With these southeastern islands being the population center, it is easy to imagine the lack of coverage along the Northwestern chain where no one lives except those stationed at remote outposts for scientific study. Manned and robotic submersible studies and limited multibeam mapping have been carried out by the Hawaii Undersea Research Lab every year in the NWHICRER for the past several years though focused on relatively shallow water biological sites. In late 2002, the first dedicated exploratory multibeam mapping expedition took place aboard the new University of Hawaii SWATH ship R/V Kilo Moana. While the primary mission was shallow mapping on carbonate platforms in support of the NWHICRER boundaries, a large amount of data were collected over the deeper volcanic foundations of the atolls. These surveys revealed dramatic rift zones on the same scale as those in the MHI, sea level terraces, submarine canyons cutting through the platforms with debris chutes continuing down to base of the islands, additional submarine landslide scars and debris fields in more detail than the USGS GLORIA sidescan program of the previous decade, and previously unmapped seamounts with some likely resulting from Hawaiian hot spot activity while others formed during creation of the Pacific Plate. A diving program is planned on many of these features in late 2003 and preliminary results will be presented.

Smith, J. R.; Miller, J.; Evans, B. K.; Johnson, P.; Weirich, J. B.

2003-12-01

399

Molecular sex identification of dry human teeth specimens from Sokoto, Northwestern Nigeria  

PubMed Central

Background: The advent of molecular techniques has revolutionized the ability of scientists to estimate the sex of individuals. Forensic odontology plays an important role in establishing the sex of victims with bodies mutilated beyond recognition due to major disaster. The genetic difference between males and females is defined by the presence or absence of the Y-chromosome. The use of alphoid-repeat primers in sex estimation was first applied on dried blood. Generally, the X, Y alphoid repeats blind test attest to the accuracy of genetic testing, and also point the potential for occasional error in morphometric sexing. Aim: To estimate genetic sex of dry human teeth specimens from Sokoto, Northwestern Nigeria, using polymerase chain reaction (PCR). Materials and Methods: A single-blind study of DNA analysis for sex estimation of nine dry human teeth specimens from Sokoto, Northwestern Nigeria, through PCR, using alphoid repeats primers, was undertaken. Results: The genetic sex of each group of the teeth samples were accurately (100%) identified. For each group of teeth, PCR Sensitivity = 100%, Specificity = 0%, Predictive value of positive test = 100%, Predictive value of negative test = 0%, False positive rate = 0%, False negative rate = 0%, Efficiency of test = 100%. Fisher's exact probability test P = 1. Z-test: z- and P values were invalid. Conclusion: This study has demonstrated the successful use of alphoid-repeat primers in genetic sex identification of human dry teeth samples from Sokoto, Northwestern Nigeria. This is the first known study estimating the sex of human dry teeth specimens by means of PCR in Nigeria. There is need for further studies in Nigeria to complement the findings of this study. PMID:25125922

Zagga, AD; Ahmed, H. OON; Ismail, SM; Tadros, AA

2014-01-01

400

Paleoseismic evidence of a surface rupture along the northwestern Himalayan Frontal Thrust (HFT)  

NASA Astrophysics Data System (ADS)

New paleoseismic evidence is presented from the Bhatpur (N 31°18'16.28?, E 76°9'50.00?) Trench site along the Himalayan Frontal Thrust (HFT) on western margin of the Janauri Anticline in NW Himachal Himalaya, India. The latest surface rupture at this site demonstrates coseismic displacement of at least 9.3 m. Radiocarbon dating of trench samples indicates that the surface ruptures occurred at A.D. 1400-1460. After comparison with other trench results along the Himalayan Front, two scenarios are presented of the latest surface rupturing earthquake event in the northwestern Indian Himalaya: (1) a single-event surface rupturing for a minimum fault length of 450 km, or (2) two-events of different lateral extent. According to the former scenario, the latest surface rupture occurred between A.D. 1404 and 1422. The latter scenario suggests the latest surface rupture occurred between A.D. 1404 and A.D. 1460 in the northwestern extent from Kala Amb to Hajipur with ~ 9.0 m of coseismic displacement over a minimum fault length of 200 km. Yet another surface rupture event in the southeastern extent from Kala Amb to Ramnagar has occurred between A.D. 1282 and A.D. 1422, with displacement ranging from 16.0 m to 26.0 m, and a minimum surface rupture length of 230 km. On the basis of these observations and historical earthquakes, it is suggested that the potential for earthquakes larger than those in the historical records are capable of producing surface-rupture lengths greater than the ~ 200 to ~ 230 km or ~ 450 km in the northwestern Indian Himalayan Front.

Kumahara, Yasuhiro; Jayangondaperumal, R.

2013-01-01

401

Florida coastal ecological characterization: a socioeconomic study of the northwestern region. Volume I. Text  

SciTech Connect

Data are compiled from existing sources on the social and economic characteristics of the Northwestern coastal region of Florida, which is made up of Escambia, Santa Rosa, Okaloosa, Walton, Bay, Gulf, and Franklin Counties. Described are the components and interrelationships among complex processes that include population and demographics characteristics, mineral production, multiple-use conflicts, recreation and tourism, agricultural production, sport and commercial fishing, transportation, industrial and residential development, and environmental issues and regulations. Energetics models of socioeconomic systems are also presented. 40 figures, 108 tables.

French, C.O.; Parsons, J.W. (eds.)

1983-08-01

402

Mycoflora of freshly harvested flint corn from Northwestern Provinces in Argentina.  

PubMed

A mycological survey was carried out for the first time, on red flint corn samples from the northwestern Andinian region of Argentina in the 1999 and 2000 harvest seasons. Species of the genus Fusarium were the most prevalent component of the flint corn mycoflora present in all provinces. F. verticillioides was the predominant Fusarium isolated in the 1999 harvest season in the the region, and was found at higher incidence level than those observed on commercial semident corn hybrids harvested in the main corn production area in Argentina (Pampean region). During the 2000 harvest season, Fusarium graminearum was most commonly isolated species in Salta province. PMID:12650597

González, H H L; Resnik, S L; Pacin, A M

2002-01-01

403

The primates of the Baly Bay area, north-western Madagascar.  

PubMed

Primate surveys were conducted in isolated primary west Malagasy decidous forest blocks around Baly Bay, north-western Madagascar. Eight species of primate were found, including Microcebus c.f. myoxinus, Hapalemur griseus occidentalis and Phaner furcifer. Two species were found only in Namoroka Strict Nature Reserve, which may mean that other forest blocks in the area have experienced primate extinctions. The record of M. c.f. myoxinus came from mangrove, the first confirmed record of a lemur from this habitat. The pelage of female Eulemur fulvus rufus was atypical. PMID:9885334

Hawkins, A F; Durbin, J C; Reid, D B

1998-01-01

404

Current vertical movement demonstrated by comparative levelling in Brittany (northwestern France)  

NASA Astrophysics Data System (ADS)

The current vertical movement of the Earth's crust is demonstrated through comparative levelling. The two methods presented are complementary. First we constructed a profile along traverses in order to highlight localized features such as recurrent faulting or block tilting. Second we produced a map of relative current vertical movement rates and their error coefficients using a geostatistical kriging method. These methods were applied to Brittany (northwestern France) and revealed that (1) the ancient NW-SE Rance and Morlaix faults are presently reactivated, and (2) the west of the region is tilted with uplift which is interpreted as a lithospheric deformation.

Lenôtre, N.; Thierry, P.; Blanchin, R.; Brochard, G.

1999-01-01

405

Interim Summary: Nesting Counts of Ospreys and Brown Pelicans in Northwestern Mexico, 2006  

USGS Publications Warehouse

The distribution and abundance of nesting populations of California brown pelicans (Pelecanus occidentalis californicus) and ospreys (Pandion haliaetus) were documented in 2006 in northwestern Mexico. For ospreys only, the 2006 data were compared to population estimates from two previous surveys (one conducted in 1977 and another conducted in the period 1992-1993). Overall, the total osprey nesting population increased from 1977 to 1992-1993 and then only changed slightly by 2006, but included regions with localized declines, increases, and stable populations. Preliminary population estimates for California brown pelicans suggest a large and apparently healthy breeding population.

Henny, Charles J.; Anderson, Daniel W.

2007-01-01

406

Possible solar forcing of 400-year wet–dry climate cycles in northwestern China  

Microsoft Academic Search

Here we present a multi-proxy paleolimnological record from a closed-basin lake (Ebinur Lake) in northwestern China to investigate\\u000a climate change in this arid region during the last 1,500 years. The 120-cm long sediment core was dated by AMS radiocarbon\\u000a and 210Pb methods. The fine-grained clay sediments contain 3–17% organic matter (OM) and 9–31% carbonate, and are interrupted by\\u000a multiple sand and

Jinglu Wu; Zicheng Yu; Hai’Ao Zeng; Ninglian Wang

2009-01-01

407

Crustaceans from antipatharians on banks of the northwestern Gulf of Mexico  

PubMed Central

Abstract The stalked barnacle Oxynaspis gracilis, the chirostylid squat lobster Uroptychus sp., and the caridean shrimps Periclimenes cf. antipathophilus and Pseudopontonides principis have been collected at 68–124 m by a remotely operated vehicle (ROV) on banks in the northern Gulf of Mexico. These species inhabited six species of antipatharian hosts. Pseudopontonides principis, Oxynaspis gracilis, and Uroptychus sp. were not confined to a single host species. Except for Oxynaspis gracilis, collected by ROV in 2004–2005, these species have not been reported previously in the northwestern Gulf of Mexico. PMID:25561830

Wicksten, Mary K.; Nuttall, Marissa F.; Hickerson, Emma L.

2014-01-01

408

Hydrologic data from Naval Oil Shale Reserves, Parachute Creek basin, northwestern Colorado, 1980-81  

USGS Publications Warehouse

Two years (water yr 1980 and 1981) of data collected by the U.S. Geological Survey for the U.S. Department of Energy, Naval Petroleum and Oil Shale Reserves, in the Parachute Creek drainage basin of northwestern Colorado are tabulated. Data were obtained from five surface water gages, two automatic sediment samplers, and two water quality monitors. Climate data include maximum, minimum, and average temperature and relative humidity, average wind speed and wind direction, and total daily solar radiation. Daily total precipitation is reported for three stations, and snow-course data reported for one site. (Author 's abstract)

Galyean, K.C.; Adams, D.B.; Collins, D.L.

1985-01-01

409

Galaxy formation  

NASA Technical Reports Server (NTRS)

Implications of the isotropy of the cosmic microwave background on large and small angular scales for galaxy formation are reviewed. In primeval adiabatic fluctuations, a universe dominated by cold, weakly interacting nonbaryonic matter, e.g., the massive photino is postulated. A possible signature of photino annihilation in our galactic halo involves production of cosmic ray antiprotons. If the density is near its closure value, it is necessary to invoke a biasing mechanism for suppressing galaxy formation throughout most of the universe in order to reconcile the dark matter density with the lower astronomical determinations of the mean cosmological density. A mechanism utilizing the onset of primordial massive star formation to strip gaseous protogalaxies is described. Only the densest, early collapsing systems form luminous galaxies.

Silk, J.

1984-01-01

410

Bacterivory in the northwestern Indian Ocean during the intermonsoon northeast monsoon period  

NASA Astrophysics Data System (ADS)

Bacterial grazing loss rates were studied by radioactive labeling of natural bacteria with L-(4,5- 3H) leucine and from the rate of disappearance of bacterial cells in the northwestern Indian Ocean. Bacterivory was measured in a mixed sample that had been combined from various depths across the euphotic zone. Experiments were performed on 26 occasions at 19 stations in the Gulf of Oman and the Arabian Sea during the intermonsoon-northeast monsoon period (November-December 1994). Combined uptake of radiolabeled bacteria (ULB) in 1-8 and 8-100 ?m size fractions was somewhat lower than loss of label (LBL) measured in the bacterial fraction (0.2-1.0 ?m), suggesting loss of radioactivity from the grazers due to metabolism. The less sensitive rate of disappearance of bacterial cells (LBC) was on average 51% higher than LBL estimates. Results from ULB and LBL measurements revealed that bacterivory was higher in the Gulf of Oman (average loss rate 4.1% h -1) than in the Arabian Sea where rates were slightly higher inshore (1.7% h -1) than in the central gyre. Heterotrophic nanoflagellates in the 1-8 ?m size fractions were identified as the primary bacterivores. Microzooplankton (8-100 ?m) accounted for 33% of total bacterivory in the Gulf of Oman but only 16% in the central Arabian Sea. Time-course experiments conducted at two stations indicated that diel changes in bacterivory may be substantial in the northwestern Indian Ocean.

Weisse, Thomas

1999-03-01

411

Profundulus kreiseri, a new species of Profundulidae (Teleostei, Cyprinodontiformes) from northwestern Honduras  

PubMed Central

Abstract A new species of Profundulus, Profundulus kreiseri (Cyprinodontiformes: Profundulidae), is described from the Chamelecón and Ulúa Rivers in the northwestern Honduran highlands. Based on a phylogenetic analysis using cytochrome b and the presence of synapomorphic characters (dark humeral spot, a scaled preorbital region and between 32-34 vertebrae), this new species is placed in the subgenus Profundulus, which also includes Profundulus (Profundulus) oaxacae, Profundulus (Profundulus) punctatus and Profundulus (Profundulus) guatemalensis. Profundulus kreiseri can be distinguished from other members of the subgenus Profundulus by having less than half of its caudal fin densely scaled. Profundulus kreiseri can further be differentiated from Profundulus (Profundulus) oaxacae and Profundulus (Profundulus) punctatus by the absence of rows of dark spots on its flanks. The new species can further be differentiated from Profundulus (Profundulus) guatemalensis by the presence of fewer caudal- and pectoral-fin rays. The new species is distinguished from congeners of the profundulid subgenus Tlaloc (viz., Profundulus (Tlaloc) hildebrandi, Profundulus (Tlaloc) labialis, Profundulus (Tlaloc) candalarius and Profundulus (Tlaloc) portillorum) by having a scaled preorbital region and a dark humeral spot. Profundulus kreiseri and Profundulus portillorum are the only two species of Profundulus that are endemic to the region south of the Motagua River drainage in southern Guatemala and northwestern Honduras. PMID:23166464

Matamoros, Wilfredo A.; Schaefer, Jacob F.; Hernández, Carmen L.; Prosanta Chakrabarty

2012-01-01

412

Soil, environmental, and watershed measurements in support of carbon cycling studies in northwestern Mississippi  

USGS Publications Warehouse

Measurements including soil respiration, soil moisture, soil temperature, and carbon export in suspended sediments from small watersheds were recorded at several field sites in northwestern Mississippi in support of hillslope process studies associated with the U.S. Geological Survey's Mississippi Basin Carbon Project (MBCP). These measurements were made to provide information about carbon cycling in agricultural and forest ecosystems to understand the potential role of erosion and deposition in the sequestration of soil organic carbon in upland soils. The question of whether soil erosion and burial constitutes an important net sink of atmospheric carbon dioxide is one hypothesis that the MBCP is evaluating to better understand carbon cycling and climate change. This report contains discussion of methods used and presents data for the period December 1996 through March 1998. Included in the report are ancillary data provided by the U.S. Department of Agriculture (USDA) ARS National Sedimentation Laboratory and U.S. Forest Service (USFS) Center for Bottomland Hardwoods Research on rainfall, runoff, sediment yield, forest biomass and grain yield. Together with the data collected by the USGS these data permit the construction of carbon budgets and the calibration of models of soil organic matter dynamics and sediment transport and deposition. The U.S. Geological Survey (USGS) has established cooperative agreements with the USDA and USFS to facilitate collaborative research at research sites in northwestern Mississippi.

Huntington, T.G.; Harden, J.W.; Dabney, S.M.; Marion, D.A.; Alonso, C.; Sharpe, J.M.; Fries, T.L.

1998-01-01

413

Fire cue effects on seed germination of six species of northwestern Patagonian grasslands  

NASA Astrophysics Data System (ADS)

Postfire recruitment of seedlings has been attributed to a stimulation of germination by fire-related cues. The germination response to heat shock (80 °C - 5 min), smoke (60 min), the combination of both factors and no heat no smoke (control) was studied in six native species (two dominant grasses, two dominant shrubs and two annual fugitive herbs) of northwestern Patagonian grasslands. Seeds of the grasses Festuca pallescens and Stipa speciosa and the shrub Senecio bracteolatus (Asteraceae) germinated when they were exposed to heat shock, whereas seeds of the other shrub, Mulinum spinosum (Apiaceae), were killed by this fire cue. In grasses, probably the glume of caryopsis protected embryos from heat. Possibly, the seed size could explain the different responses of the two shrubs. Heat combined with smoke reduced seed germination for S. speciosa and S. bracteolatus. The heat could have scarified seeds and the longer exposure to smoke could have been toxic for embryos. The same treatment increased germination of the annual fugitive herb Boopis gracilis (Calyceraceae). We concluded that fire differentially affects the seedling recruitment of the studied species in the northwestern Patagonian grasslands.

Gonzalez, S. L.; Ghermandi, L.

2012-09-01

414

A Survey of Phytoparasitic Nematodes on Cultivated and Non-Cultivated Plants in Northwestern Egypt  

PubMed Central

Surveys were conducted in Alexandria, El-Behera, and Matrouh Governorates in northwestern Egypt during the 1994-1998 cropping seasons to study the occurrence, population density, host associations, and distribution of phytoparasitic nematodes associated with 35 major crops, grasses, and weeds. A total of 220 soil and root samples containing mixed populations of 26 genera and 38 species of phytoparasitic nematodes was analyzed; three known genera and 13 known species are reported for the first time in northwestern Egypt. Root-knot nematodes with 34 occurrences were the most frequently encountered group of nematodes, followed by spiral, stunt, ring, lesion, lance, and dagger nematodes with 19, 18, 15, 9, 8, and 7 occurrences, respectively. New species records are Boleodorus pakistanensis, Criconemella sphaerocephala, Discocriconemella sphaerocephaloides, Hemicriconemoides cocophilus, Hemicycliophora thienmanni, Hoplolaimus clarissimus, Irantylenchus clavidorus, Merlinius nanus, Paratylenchus projectus, Tylenchorhynchus ebriensis, Tylenchus afghanicus, T. exiguus, Xiphinema basilgoodeyi, and X. ensiculiferum. Survey results showed new host plant records for most of the identified nematode species in Egypt. PMID:19270998

Ibrahim, I. K. A.; Handoo, Z. A.; El-Sherbiny, A. A.

2000-01-01

415

Mud volcanoes in North-Western Caucasus: deep seated structures and scenarios of activity  

NASA Astrophysics Data System (ADS)

According to modern concepts, the roots of mud volcanoes in the North-Western Caucasus are not older than Oligocene and rocks containing the hydrocarbon component of gases are not older than Cretaceous. However, according to petrographic data, mud volcanic breccia in the Taman province contain quartz porphyries, glassy obsidians, trachytoids, and igneous rock fragments of Late Jurassic or even older age. Gaseous exhalations from mud volcanoes of the West Kuban longitudinal and Kerch-Taman transverse troughs contain carbon dioxide with the mantle carbon signature. Results of complementary geological and geophysical studies of mud volcanic phenomena in North-Western Caucasus (Taman mud volcanic province) are presented. For the two different mud volcanoes their deep subsurface structure has been revealed and discussed with respect to regional tectonic settings, geology and geomorphology. The Gora Karabetova mud volcano is one of the most active mud volcanoes in the Taman peninsula with primarily explosive behaviour while the Shugo mud volcano's activity pattern is different, explosive events are rare and both types of phenomena may be explained by the configuration of their feeding systems, tectonic position and deep pathways of migration of fluids.

Sobisevich, A. L.; Ovsuychenko, A. N.; Sobisevitch, L. E.; Pouzich, I. N.

2012-04-01

416

Indexes of hydrologic data from selected coal-mining areas in northwestern Colorado  

USGS Publications Warehouse

Currently (1988), data from hydrologic studies related to coal mining that have been done in northwestern Colorado since the early 1970 's are stored in the files of private companies and government offices and in various computer systems. To compile these data for additional research, a trip to each office would have to be made to determine the availability and acceptability of the data. The U.S. Geological Survey, in cooperation with the U.S. Bureau of Land Management and the Colorado Mined Land Reclamation Division, has created a database (COALDATA) that includes stream discharge, groundwater levels, and chemical analysis of water samples that were collected by private companies and government agencies other than the U.S. Geological Survey in and near selected coal mines in northwestern Colorado. Indexes in this report list 93 surface water sites and 95 groundwater sites where hydrologic data are available in the COALDATA data base. The indexes also list 62 surface water sites and 480 groundwater sites in the U.S. Geological Survey data base, which is separate from the COALDATA data base and contains only data collected by the U.S. Geological Survey. The combined output of the COALDATA data base and the U.S. Geological Survey data base provides surface water and groundwater data that include most of the study area. (USGS)

Gaggiani, N.G.

1989-01-01

417

Aerosols properties during dust-storm episodes over Jaipur, Northwestern India  

NASA Astrophysics Data System (ADS)

Continuous routine aerosol measurements have been carried out at Jaipur (Rajasthan, Northwestern India) since April 2009 with a CIMEL sun photometer integrated in the global Aerosols Robotic Network (AERONET) program. The present study investigates the aerosol properties during dust storm episodes over Jaipur, Northwestern India. A series of high dust storms were identified as indicated by high values of aerosols optical thickness (AOT) with a significant drop in angstrom exponent values (nearly zero and negative). Consequently, a progressive increase in Single Scattering Albedo (SSA440 nm = 0.89, SSA675 nm = 0.95, SSA870 nm = 0.97, SSA1020 nm = 0.976) suggests more scattering nature of regional aerosols associated with abundant dust loading. Trajectories back in time showed that the air collected in Jaipur during dust period originated from desert regions in the western part of India. Additionally, a comparative analysis of the mean AOT derived from satellite data and Potential Source Contribution Function (PSCF) analysis helped to understand the source region of these particles.

Payra, Swagata; Verma, Sunita; Prakash, Divya; Kumar, Pramod; Soni, Manish; Holben, Brent

2013-05-01

418

Genetic structuring of remnant forest patches in an endangered medicinal tree in North-western Ethiopia  

PubMed Central

Background Habitat loss and fragmentation may have detrimental impacts on genetic diversity, population structure and overall viability of tropical trees. The response of tropical trees to fragmentation processes may, however, be species, cohort or region-specific. Here we test the hypothesis that forest fragmentation is associated with lower genetic variability and higher genetic differentiation in adult and seedling populations of Prunus africana in North-western Ethiopia. This is a floristically impoverished region where all but a few remnant forest patches have been destroyed, mostly by anthropogenic means. Results Genetic diversity (based on allelic richness) was significantly greater in large and less-isolated forest patches as well as in adults than seedlings. Nearly all pairwise FST comparisons showed evidence for significant population genetic differentiation. Mean FST values were significantly greater in seedlings than adults, even after correction for within population diversity, but varied little with patch size or isolation. Conclusions Analysis of long-lived adult trees suggests the formerly contiguous forest in North-western Ethiopia probably exhibited strong spatial patterns of genetic structure. This means that protecting a range of patches including small and isolated ones is needed to conserve the extant genetic resources of the valuable forests in this region. However, given the high livelihood dependence of the local community and the high impact of foreign investors on forest resources of this region, in situ conservation efforts alone may not be helpful. Therefore, these efforts should be supported with ex situ gene conservation actions. PMID:24602239

2014-01-01

419

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements  

NASA Astrophysics Data System (ADS)

We present a horizontal velocity field determined from a GPS network with 22 sites surveyed from 2001 to 2012 in northwestern Vietnam. The velocity is accurately estimated at each site by fitting a linear trend to each coordinate time series, after accounting for coseismic displacements caused by the 2004 Sumatra and the 2011 Tohoku earthquakes using static fault models. Considering the coseismic effects of the earthquakes, the motion of northwestern Vietnam is 34.3 ± 0.7 mm/yr at an azimuth of N108° ± 0.7°E in ITRF2008. This motion is close to, but slightly different from, that of the South China block. The area is in a transition zone between this block, the Sundaland block, and the Baoshan sub-block. At the local scale, a detailed estimation of the crustal deformation across major fault zones is geodetically revealed for the first time. We identify a locking depth of 15.3 ± 9.8 km with an accumulating left-lateral slip rate of 1.8 ± 0.3 mm/yr for the Dien Bien Phu fault, and a shallow locking depth with a right-lateral slip rate of 1.0 ± 0.6 mm/yr for the Son La and Da River faults.

Duong, N. A.; Sagiya, T.; Kimata, F.; To, T. D.; Hai, V. Q.; Cong, D. C.; Binh, N. X.; Xuyen, N. D.

2013-12-01

420

Fire Regimes and Forest Structure in the Mountains of Northwestern Mexico and Southern California  

NASA Astrophysics Data System (ADS)

In contrast to a few isolated forests in northern Mexico, most forests in the western Untied States have been significantly modified by fire suppression, harvesting, and livestock grazing. The culmination of these past management activities has produced over 20 million ha of US forests with high fire hazards and many of these areas are in need of restoration. Understanding reference conditions is challenging because we have few intact forests functioning under the continuing influence of climate variation, insects, diseases, and frequent fires. This presentation summarizes information from reference sites in northwestern Mexico and contrasts it to current forest structure and fire regimes in southern California forests. Heterogeneity is common in the intact forests of northwestern Mexico. Restoration targets across similar forests in the United States and elsewhere should incorporate variation and not manage for average characteristics at the stand level, replicated for all stands across very large spatial scales. Conservation of the forests in the northwester Mexico is critical because it is the last landscape-scale, old-growth mixed conifer forest in western North America with a relatively intact frequent fire regime.

Stephens, S. L.

2004-12-01

421

To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff member, faculty member, or a student that is paid click on the Current Northwestern  

E-print Network

To get started, point your browser to http://www.northwestern.edu/hr/jobs . 1. If you are a staff to search for regular staff or temporary jobs. You will be brought to the Self Service sign in page where links. Self Service > Recruiting/Job Openings > Apply for Jobs. This will automatically sign you

Shahriar, Selim

422

An association between urinary cadmium and urinary stone disease in persons living in cadmium-contaminated villages in northwestern Thailand: A population study  

SciTech Connect

Excessive urinary calcium excretion is the major risk of urinary stone formation. Very few population studies have been performed to determine the relationship between environmental cadmium exposure and urinary stone disease. This population-based study examined an association between urinary cadmium excretion, a good biomarker of long-term cadmium exposure, and prevalence of urinary stones in persons aged 15 years and older, who lived in the 12 cadmium-contaminated villages in the Mae Sot District, Tak Province, northwestern Thailand. A total of 6748 persons were interviewed and screened for urinary cadmium and urinary stone disease in 2009. To test a correlation between urinary excretion of cadmium and calcium, we measured urinary calcium content in 1492 persons, who lived in 3 villages randomly selected from the 12 contaminated villages. The rate of urinary stones significantly increased from 4.3% among persons in the lowest quartile of urinary cadmium to 11.3% in the highest quartile. An increase in stone prevalence with increasing urinary cadmium levels was similarly observed in both genders. Multiple logistic regression analysis revealed a positive association between urinary cadmium levels and stone prevalence, after adjusting for other co-variables. The urinary calcium excretion significantly increased with increasing urinary cadmium levels in both genders, after adjusting for other co-variables. Elevated calciuria induced by cadmium might increase the risk of urinary stone formation in this environmentally exposed population. - Research highlights: {yields} Excessive calciuria is the major risk of urinary stone formation. {yields} We examine cadmium-exposed persons for urinary cadmium, calcium, and stones. {yields} The rate of urinary stones increases with increasing urinary cadmium. {yields} Urinary calcium excretion increases with increasing urinary cadmium. {yields} Elevated calciuria induced by cadmium may increase the risk of urinary stones.

Swaddiwudhipong, Witaya, E-mail: swaddi@hotmail.com [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand); Mahasakpan, Pranee [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Community and Social Medicine, Mae Sot General Hospital, Tak 63110 (Thailand); Limpatanachote, Pisit; Krintratun, Somyot [Department of Internal Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)] [Department of Internal Medicine, Mae Sot General Hospital, Tak 63110 (Thailand)

2011-05-15

423

SHRIMP U-Pb zircon geochronological constraints on Cryogenian-Ediacaran tectonomagmatic events in the northwestern Arabian Shield  

NASA Astrophysics Data System (ADS)

The northwestern Arabian Shield is dominated by juvenile Neoproterozoic crust of the Midyan terrane (MT), composed of volcanosedimentary and multiple phases of intrusive rocks. Terrane protoliths are ~780-550 Ma, and reflect geotectonic changes within a regional framework of the East African Orogeny reflecting progression from a juvenile oceanic island arc and suprasubduction ophiolite to arc-arc collision to continental magmatic arc to crustal thickening with thrusting and strike-slip shearing (Najd fault system) to extensional collapse, within-plate magmatism and final cratonization. The oldest intrusive rocks (the Muwaylih suite) yield middle Cryogenian SHRIMP U-Pb zircon ages: 748±9 Ma for Imdan complex gabbro, and 736.6±9.6 Ma and 738.8±4.2 Ma for Nabt complex diorite and tonalite. They represent pretectonic intrusions in a ~750-720 Ma oceanic island arc made up of Zaam group volcanosedimentary rocks, diamictite, and banded iron formation. Bayda group subaerial felsic metavolcanic rocks (Hijr formation: ~710±12 Ma) are believed to stratigraphically overlie the Zaam group and are interpreted as volcanic equivalents of a younger phase of Muwaylih suite magmatism (~720-710 Ma). Arc-arc collision at ~710-700 Ma between the MT and the Jiddah terrane (JT) to the south resulted in the Yanbu suture and formation of an Andean-type, continental magmatic arc. This phase of continental magmatism is represented by syntectonic, calc-alkaline intrusions such as granodiorite of the Buwaydah complex (686.5±3.7 Ma), a rhyolite dike that intrudes the granodiorite (687.4±2.2 Ma), and late gabbro/diorite of the Imdan complex (676±6 Ma), all of which are assigned to the Hamadat suite (700-680 Ma). Exhumation and erosion of the magmatic arc resulted in formation of post-amalgamation (as related to the already sutured MT and JT), syntectonic basins. One of the oldest basins in the MT, filled with the few-km thick Thalbah group, appears to be intruded by granitic bodies comparable with monzogranite of the Liban complex dated at 634.5±4.6 Ma. Similar, Cryogenian/Ediacaran ages are obtained from syenogranite of the Kara Dakha complex (631.8±4.0 Ma) and Abu Suar complex (626±4 Ma). All three granitoids belong to an early stage of the Marabit suite, and represent peak activity of calc-alkaline, syntectonic arc-related magmatism. A mafic dike dated ~617.7±4.4 Ma intrudes basal sedimentary rocks in the Thalbah basin, constraining the basin minimum deposition age. Ediacaran ages of 609±3.6 Ma from syenogranite of the Ash Shab complex and 608.9±2.8 Ma from monzogranite of the Habd complex, belong to a late stage of the Marabit suite (610-600 Ma), and represent late-tectonic, calc-alkaline magmatism resulting from extensive crustal melting in an extensional regime.

Kozdrój, Wies?aw; Kennedy, Allen; Johnson, Peter R.; Zió?kowska-Kozdrój, Ma?gorzata; Kadi, Khalid

2014-05-01

424

[Digenea of Haliaeetus albicilla (Linnaeus, 1758) and Pandion haliaetus (Linnaeus, 1758) from middle and north-western Poland].  

PubMed

In 2003-2008 eight white-tailed eagles and two ospreys from middle and north-western Poland were examined for the presence of parasites. Nine birds were infected with 5 digenean species: Conodiplostomum perlatum, Paracoenogonimus ovatus, Strigeafalconis, Metorchis crassiusculus and Nematostrigea serpens. M. crassiusculus was found for the first time in an eagle from Poland. PMID:19338229

Kalisi?ska, Elzbieta; Rzad, Izabella; Sitko, Jilji; Kavetska, Katarzyna M; Królaczyk, Katarzyna; Budis, Halina

2008-01-01

425

Possible Vector Dissemination by Swift Foxes following a Plague Epizootic in Black-tailed Prairie Dogs in Northwestern Texas  

Microsoft Academic Search

To determine whether swift foxes (Vulpes velox) could facilitate transmission of Yersinia pestis to uninfected black-tailed prairie dog (Cynomys ludovicianus) colonies by ac- quiring infected fleas, ectoparasite and sero- logic samples were collected from swift foxes living adjacent to prairie dog towns during a 2004 plague epizootic in northwestern Texas, USA. A previous study (1999-2001) indicated that these swift foxes

Brady K. McGee; Matthew J. Butler; Danny B. Pence; James L. Alexander; Janet B. Nissen

426

Vegetation and fire dynamics in different geological settings since the last ice age, Klamath Mountains, northwestern, CA  

Microsoft Academic Search

The Klamath Mountains of northwestern California are a floristic hotspot and their diversity likely results from a combination of geological, ecological and historical factors (e.g., long-term climate change). To evaluate how climate change has influenced past composition, structure, and disturbance regime of the Klamath forests in different geological settings, vegetation and fire histories from four sites, Bolan (1), Sanger (in

C. Briles; C. Whitlock; P. Bartlein

2006-01-01

427

Association between nutritional indicators and infectivity of dogs seroreactive for Trypanosoma cruzi in a rural area of northwestern Argentina  

Microsoft Academic Search

The association between the nutritional state of mongrel dogs naturally infected with Trypanosoma cruzi and their infectivity to Triatoma infestans bugs and immune response to Trypanosoma cruzi were studied in the rural village of Amamá, northwestern Argentina. All of the 97 evaluated dogs were classified into one\\u000a of three categories of external clinical aspect (ECA) based on the degree of

Rosario M. Petersen; Ricardo E. Gürtler; María C. Cecere; Diana N. Rubel; Marta A. Lauricella; Diana Hansen; Mirta A. Carlomagno

2001-01-01

428

Silvopastoral systems in Northwestern Patagonia II: water balance and water potential in a stand of Pinus ponderosa and native grassland  

Microsoft Academic Search

The climate of the ecotone between forest and steppe in North-Western Patagonia, is of Mediterranean type, with rainy winters and dry summers. As a consequence, most of the region presents water deficits during part of the spring and all the summer. Water interactions between Pinus ponderosa Doug. (Laws) and Stipa speciosa (Trin. et Rupr.), a native grass species, were studied.

J. E. Gyenge; M. E. Fernández; G. Dalla Salda; T. M. Schlichter

2002-01-01

429

Coexistence of congeneric native and invasive species: The case of the green algae Codium spp. in northwestern Spain  

E-print Network

. in northwestern Spain Irene Rojo a, * , Celia Olabarria a , Marta Santamaria b , Jim Provan c , Tomas Gallardo d, Campus Lagoas-Marcosende, 36310 Vigo, Pontevedra, Spain b Area de Biodiversidad y Conservacion, Universidad Rey Juan Carlos, C/Tulipan s/n, 28933 Mostoles, Spain c School of Biological Sciences

Provan, Jim

430

‘Now If You Have Only Sons You Are Dead’: Migration, Gender, and Family Economy in Twentieth Century Northwestern Ghana  

Microsoft Academic Search

This article explores the interconnectedness between labor migration, gender, and the family economy in northwestern Ghana in the 20th century. It focuses specifically on the Dagaaba of the Nadowli and Jirapa administrative districts of what is now the Upper West Region (UWR). It examines how the relationships between men and women in terms of roles, status, access to productive resources

Gariba B Abdul-Korah

2011-01-01

431

The effect of Holocene temperature fluctuations on the evolution and ecology of Neotoma (woodrats) in Idaho and northwestern Utah  

E-print Network

-tailed woodrat (Neotoma cinerea), at five locations within south central Idaho and northwestern Utah. Previous; Body mass; Species replacement; Neotoma lepida; Neotoma cinerea; Late Quaternary; Global warmingThe effect of Holocene temperature fluctuations on the evolution and ecology of Neotoma (woodrats

432

Geology of the Palladium-rich Legris Lake Mafic-Ultramafic Complex, Western Wabigoon Subprovince, Northwestern Ontario  

E-print Network

, Northwestern Ontario NEIL T. PETTIGREW and KÃ?IKO H. HATTORI Department of Earth Sciences, University of Ottawa and Ottawa-Carleton Geoscience Centre Ottawa, Ontario, Canada, K1N 6N5 Received April 2, 2001; accepted on the Legris Lake Complex has included: an aeromagnetic survey by the Ontario Depart- ment of Mines

433

Northwestern University Initiative for Teaching NanoSciences (NUITNS): An Approach for Teaching Computational Chemistry to Engineering Undergraduate Students  

ERIC Educational Resources Information Center

The Northwestern University Initiative for Teaching Nanosciences (NUITNS) at nanohub.org Web site combines several tools for doing electronic structure calculations and analyzing and displaying the results into a coordinated package. In this article, we describe this package and show how it can be used as part of an upper-level quantum chemistry…

Simeon, Tomekia; Aikens, Christine M.; Tejerina, Baudilio; Schatz, George C.

2011-01-01

434

NESTING AND BROOD-REARING SUCCESS AND RESOURCE SELECTION OF GREATER SAGE-GROUSE IN NORTHWESTERN SOUTH DAKOTA  

E-print Network

NESTING AND BROOD-REARING SUCCESS AND RESOURCE SELECTION OF GREATER SAGE-GROUSE IN NORTHWESTERN to conduct research on sage-grouse, and other upland game species. The past three years have provided me to thank Tony Apa for showing me my first sage-grouse, and the techniques to capture and radio- mark them

435

DISTRIBUTION OF TUNA LARVAE (PISCES, SCOMBRIDAE) IN THE NORTHWESTERN GULF OF GUINEA AND OFF SIERRA LEONE 1  

E-print Network

DISTRIBUTION OF TUNA LARVAE (PISCES, SCOMBRIDAE) IN THE NORTHWESTERN GULF OF GUINEA AND OFF SIERRA LEONE 1 WILLIAM J. RICHARDS AND DAVID C. SIMMONS' ABSTRACT Investigations of tuna larvae distributions, and February-April 1965. Larvae of the yellowfin tuna, bigeye tuna, skipjack tuna, little tunny, and frigate

436

Land suitability assessment for perennial crops using remote sensing and Geographic Information Systems: A case study in northwestern Egypt  

Microsoft Academic Search

The main objective of this study was to develop a Geographic Information Systems-based model for land suitability assessment for guava, olive and date palm in the North-western coast of Egypt. Soil, climatic and landscape database as well as satellite image have been integrated through Geographic Information Systems (GIS). A Landsat ETM+ image dated 2001, was classified using maximum likelihood classifier

A. Shalaby; Y. O. Ouma; R. Tateishi

2006-01-01

437

Seasonal changes in planktonic foraminifera in the northwestern North Pacific Ocean: sediment trap experiments from subarctic and subtropical gyres  

Microsoft Academic Search

Upper ocean environments such as seawater temperature, salinity, thermal structure in the water column, light intensity and food supply affect the assemblage of planktonic foraminifera. Since detailed information on planktonic foraminifera was not available for the northwestern North Pacific, we examined seasonal changes in fluxes and composition of planktonic foraminifera there. Data were collected by sediment traps deployed at three

Azumi Kuroyanagi; Hodaka Kawahata; Hiroshi Nishi; Makio C Honda

2002-01-01

438

Response of benthic invertebrate assemblages to metal exposure and bioaccumulation associated with hard-rock mining in northwestern streams, USA  

Microsoft Academic Search

4 Abstract. Benthic macroinvertebrate assemblages, environmental variables, and associated mine density were evaluated during the summer of 2000 at 18 reference and test sites in the Coeur d'Alene and St. Regis River basins, northwestern USA as part of the US Geological Survey's National Water- Quality Assessment Program. Concentrations of Cd, Pb, and Zn in water and (or) streambed sediment at

T. R. MARET; D. J. C AIN; D. E. M ACCOY; T. M. SHORT

2003-01-01

439

An Integrated Multi-Institutional Diabetes Prevention Program Improves Knowledge and Healthy Food Acquisition in Northwestern Ontario First Nations  

ERIC Educational Resources Information Center

This article presents the impact results of a feasibility study in Canada for prevention of risk factors for diabetes in seven northwestern Ontario First Nations. Baseline and follow-up data were collected before and after the 9-month intervention program in schools, stores, and communities that aimed to improve diet and increase physical activity…

Ho, Lara S.; Gittelsohn, Joel; Rimal, Rajiv; Treuth, Margarita S.; Sharma, Sangita; Rosecrans, Amanda; Harris, Stewart B.

2008-01-01

440

Mitochondrial DNA variation in bull trout (Salvelinus confluentus) from northwestern North America: implications for zoogeography and conservation  

Microsoft Academic Search

Bull trout, Salvelinus confluentus (Salmonidae), are distributed in northwestern North America from Nevada to Yukon Territory, largely in interior drainages. The species is of conservation concern owing to declines in abundance, particularly in southern portions of its range. To investigate phylogenetic structure within bull trout that might form the basis for the delineation of major conservation units, we conducted a

Eric B. Taylor; Susan Pollard; Derek Louie

1999-01-01

441

Long-range transport of Saharan dust over northwestern Europe during EUCAARI 2008 campaign: Evolution of dust optical  

E-print Network

Long-range transport of Saharan dust over northwestern Europe during EUCAARI 2008 campaign: Evolution of dust optical properties by scavenging N. Bègue,1 P. Tulet,1 J.-P. Chaboureau,2 G. Roberts,3 L; published 5 September 2012. [1] The evolution of dust optical properties is illustrated in this paper

Paris-Sud XI, Université de

442

The Lateglacial and Postglacial vegetation history of the northwestern limits of Beringia, based on pollen, stomate and tree stump evidence  

Microsoft Academic Search

In order to reconstruct the Late- and Postglacial vegetation history of the northwestern edge of Beringia, a sediment core was collected from a lake north of the present treeline along the lower Lena River of northeastern Siberia, and analysed for fossil pollen and stomates. In addition, fossil tree stumps were collected in the vicinity of the lake. Eight radiocarbon dates

M. F. J. Pisaric; G. M. MacDonald; A. A. Velichko; L. C. Cwynar

2001-01-01

443

Effect of meteorological conditions on occurrence of hand, foot and mouth disease in Wuwei City, Northwestern China  

Microsoft Academic Search

The main objective of this paper is to supply scientific basics for preventing and forecasting the prevalence of hand, foot and mouth disease to explore the effect of different meteorological conditions on occurrence of hand, foot and mouth disease in Wuwei City, northwestern China. Here the data about the diseases and weather was collected from 2008–2010, and the correlation analysis,

Shan Zheng; Minzhen Wang; Shigong Wang; Kezheng Shang; Lili Hu; Jinrong Dong

2011-01-01

444

NORTHWESTERN NATURALIST 88:147154 WINTER 2007 A COMPARISON OF GROUND-BASED AND TREE-BASED  

E-print Network

these findings, traditional techniques are still employed to assess trends of the Pacific Tree- frog (Pseudacris147 NORTHWESTERN NATURALIST 88:147­154 WINTER 2007 A COMPARISON OF GROUND-BASED AND TREE in the Pacific Northwest. We compared the effectiveness of ground-based and tree-based PVC pipes for capturing

Johnson, Matthew

445

Geology of the ignimbrites and the associated volcano–plutonic complex of the Ezine area, northwestern Anatolia  

Microsoft Academic Search

The Ezine region is located in the northwestern part of Anatolia where young granitic and volcanic rocks are widespread and show close spatial and temporal association. In this region magmatism began with the Kestanbol granite, which intruded into metamorphic basement rocks, and formed contact metamorphic aureole. To the east and southeast the pluton is surrounded by hypabyssal rocks, which in

Z. Karacik; Y. Yilmaz

1998-01-01

446

76 VOL. 104VEGETATION OF THE OAK OPENINGS Description of Vegetation of the Oak Openings of Northwestern Ohio at  

E-print Network

76 VOL. 104VEGETATION OF THE OAK OPENINGS Description of Vegetation of the Oak Openings a map of the Oak Openings of northwestern Ohio showing the vegetation at the time of Euro-American settlement (1817-1832). For that period, the area of the Oak Openings was 43% Oak Savanna, 27% Wet Prairie

Gottgens, Hans

447

Histograms showing variations in oil yield, water yield, and specific gravity of oil from Fischer assay analyses of oil-shale drill cores and cuttings from the Piceance Basin, northwestern Colorado  

USGS Publications Warehouse

Recent studies indicate that the Piceance Basin in northwestern Colorado contains over 1.5 trillion barrels of oil in place, making the basin the largest known oil-shale deposit in the world. Previously published histograms display oil-yield variations with depth and widely correlate rich and lean oil-shale beds and zones throughout the basin. Histograms in this report display oil-yield data plotted alongside either water-yield or oil specific-gravity data. Fischer assay analyses of core and cutting samples collected from exploration drill holes penetrating the Eocene Green River Formation in the Piceance Basin can aid in determining the origins of those deposits, as well as estimating the amount of organic matter, halite, nahcolite, and water-bearing minerals. This report focuses only on the oil yield plotted against water yield and oil specific gravity.

Dietrich, John D.; Brownfield, Michael E.; Johnson, Ronald C.; Mercier, Tracey J.

2014-01-01

448

Galaxy formation  

PubMed Central

It is argued that within the standard Big Bang cosmological model the bulk of the mass of the luminous parts of the large galaxies likely had been assembled by redshift z ? 10. Galaxy assembly this early would be difficult to fit in the widely discussed adiabatic cold dark matter model for structure formation, but it could agree with an isocurvature version in which the cold dark matter is the remnant of a massive scalar field frozen (or squeezed) from quantum fluctuations during inflation. The squeezed field fluctuations would be Gaussian with zero mean, and the distribution of the field mass therefore would be the square of a random Gaussian process. This offers a possibly interesting new direction for the numerical exploration of models for cosmic structure formation. PMID:9419326

Peebles, P. J. E.

1998-01-01

449

Origin of the Early Permian zircons in Keping basalts and magma evolution of the Tarim Large Igneous Province (northwestern China)  

NASA Astrophysics Data System (ADS)

The Tarim continental flood basalts (CFBs) provide important clues about the genesis and magmatic evolution of the Early Permian Tarim Large Igneous Province (Tarim LIP) in northwestern China. Here we present results of LA-MC-ICPMS Lu-Hf isotope analysis on Early Permian (ca. 290 Ma) zircons extracted from the Tarim CFBs in the Keping area, northwest of the Tarim Basin. Zircons from two sub-groups of Keping basalts (Groups 1a and 1b) have similar Lu-Hf isotopic compositions and exhibit a relatively large range of 176Hf/177Hf ratios between 0.282422 and 0.282568. Their negative ?Hf(t) values (- 6.8-- 1.4) are generally lower than the whole-rock ?Hf(t) values of their host basalts (- 2.8-2.1), and are distinct from other known intrusive rocks (- 0.3-7.1) in the Tarim LIP and their hosted zircons (4.9-8.8). Systematic studies of Hf isotopic data from Tarim and its adjacent regions reveal that these zircons are probably xenocrysts, sourced from coeval igneous rocks in the South Tianshan Orogen (e.g., the Lower Permian Xiaotikanlike Formation volcanic and pyroclastic rock suite). This, together with the presence of Precambrian zircons in Keping basalts, clearly indicates crustal contamination during their eruptions and provides hints about the potential contaminant sources. Geochemical modeling further suggests that the earlier erupted Group 1b basalts experienced more contamination, predominantly by some high Th-U-Pb rock components, most likely from the South Tianshan Orogen. The later erupted Group 1a basalts in the Keping area have been less contaminated with mainly the Tarim Precambrian rocks. Another group of the Tarim CFBs in the Northern Tarim Uplift (Group 2) appears to have undergone negligible crustal contamination but possesses evidence for variable source compositions. The modeling also indicates that the uncontaminated parental magmas of various Tarim LIP rocks (from the picrites and basalts to ultramafic-mafic and syenitic intrusive rocks) exhibit a wide range of ?Nd(t) values (ca. - 5-5), reflecting source isotopic heterogeneity, which may be a consequence of plume-lithosphere interaction during the generation of the Tarim LIP.

Li, Yin-Qi; Li, Zi-Long; Yu, Xing; Langmuir, Charles H.; Santosh, M.; Yang, Shu-Feng; Chen, Han-Lin; Tang, Zhong-Li; Song, Biao; Zou, Si-Yuan

2014-09-01

450

Hydrogeochemical and vertical electrical soundings for groundwater investigations, Burg El-Arab area, Northwestern Coast of Egypt  

NASA Astrophysics Data System (ADS)

An integrated geological, hydrochemical, and geoelectrical investigation of shallow groundwater occurrence in Burg El-Arab area, northwestern coastal zone of Egypt is carried out. Groundwater of oolitic limestone and clastic aquifers is the principal source of water supply for agriculture in the area. The purpose of this study is to describe the hydrogeologic characteristics of aquifers and to provide a general evaluation of the chemical quality of water in aquifers. Chemical analysis was used to evaluate the chemical characteristics of groundwater and assessment of water quality. Electrical soundings were employed to delineate different water bearing formations and the configuration of the interface between them. Thirty-four water samples were collected and chemically analyzed from the two main aquifers in the area. Groundwaters of oolitic limestone aquifer are dominated by NaCl and have average TDS of approximately 2830 mg/l. Groundwater samples from clastic aquifer are slightly weakly mineralized (TDS approximately 2700 mg/l) and dominated by CaSO4. The hydrochemical data indicate that the groundwater is of meteoric origin. The variation in the chemistry of water is thought to be related to the weathering of minerals of the water-bearing sediments, mixing with marine water, and leaching of fertilizers in the newly reclaimed areas. Groundwater of the area can be used for irrigation under special circumstances management as the sodium hazard is medium while the salinity hazard ranges from high to very high. Thirty-four profiles of vertical electrical soundings (VESs) were obtained in Burg El-Arab area to examine the variations of subsurface geology and associated groundwater chemistry. Resistivity and thickness of aquifers, resistivity of the unsaturated zone and depth to the confining bed have been delineated from the interpretation of electrical sounding data. The range of electrical resistivity values have been assigned to different layers by calibrating electrical resistivity with the borehole data. Results of the vertical electrical soundings and the hydrochemistry of the groundwater samples show that the brackish groundwater is dominated in the study area whereas the fresh groundwater is found as isolated patches in oolitic limestone aquifer.

Atwia, Mohamed G.; Abu-Heleika, Mohamed M.; El-Horiny, Mohamed M.

2013-04-01

451

Fossil formation  

NSDL National Science Digital Library

The National Science Education Standards Life Science Content Standard mentions that fossils indicate extinct species and contribute to an understanding of evolution and diversity. The Earth and Space Sciences Content Standard tells us they provide clues about past environments. But what is a fossil? How does it form? The processes can be complex. An understanding of fossil formation will enable accurate student conceptions of related science concepts including methods of science in geology, paleontology, and evolution.

University, Staff A.

2008-03-07

452

Clay minerals and geochemistry of the bottom sediments in the northwestern East China Sea  

NASA Astrophysics Data System (ADS)

Clay minerals of 34 sediments collected from the northwestern continental shelf of the East China Sea have been determined by X-ray diffraction analysis. The clay mineral distribution is mainly controlled by the sediment source and the dominant circulation pattern. The predominant clay mineral in our study area is illite comprising more than 67% of the whole clay fraction. The highest concentration of illite (>68%) is found in the southeastern offshore parts beyond the reach of terrigenous input from the Jeju Island. It means that these illites are largely transported by the Kuroshio Current from the South China Sea (SCS). Smectite is highly concentrated in the northwest middle part and in the outer-shelf mud patch. It seems to be due to the high supply of smectite transported from China where fine-grained sediments are discharged from modern and ancient Huanghe (Yellow) River. The relatively high abundant kaolinite is likely derived from the Changjiang (Yangtze) River via the Taiwan Warm Current. In contrast, large amounts of chlorite and high chlorite/kaolinite ratios occur in the northwestern area, reflecting the transportation by the Yellow Sea Coastal Current from the southern Yellow Sea. The discrimination diagrams clearly show that the sediments in the northwestern East China Sea are ultimately sourced from Chinese rivers, especially from the Huanghe River, whereas the sediment in the northeast part might come from the Jeju Island. The muddy sediments of the Changjiang River’s submerged delta have much lower 87Sr/86Sr ratios (0.716 2-0.718 0) than those of the Shandong Peninsular mud wedge (0.721 6-0.724 9), which are supposed to be originated from the Huanghe River, suggesting the distribution pattern of 87Sr/86Sr ratios as a new tracer to discriminate the provenance of shelf sediments in the study area. The 87Sr/86Sr ratios of the outer-shelf muddy sediments ranged from 0.7169 to 0.7216 in a wide range and was between those of the Huanghe River and Changjiang River sediments, suggesting multiple sources of the sediment in the area.

Youn, Jeungsu; Yang, Shouye; Park, Yong Ahn

2007-07-01

453

Northwestern Agricultural  

E-print Network

, data collection, and the operation of small farm equipment. Laboratory work includes data entry and laboratory settings. Field work includes assisting with the establishment and maintenance of research plots, processing plant and grain samples (e.g. weighing, counting) and lab maintenance. Experience/Skills Requested

Maxwell, Bruce D.

454

Northwestern Agricultural  

E-print Network

assisting with the establishment and maintenance of research plots, data collection, and the operation of small farm equipment. Laboratory work includes data entry, processing plant and grain samples (e.g. weighing, counting) and lab maintenance. Experience/Skills Requested: Interest or experience in crop

Maxwell, Bruce D.

455

Mercury levels in raccoons (Procyon lotor) from the Warta Mouth National Park, northwestern Poland.  

PubMed

This is the first report on mercury (Hg) levels in the liver, kidney, skeletal muscle, and brain of raccoon in Europe. It studied Hg concentration in 24 raccoons from the Warta Mouth National Park, northwestern Poland by atomic absorption spectroscopy (AAS). The highest total Hg concentrations in the raccoon were found in the liver (maximum, 18.45 mg/kg dry weight), while the lowest in the brain (maximum, 0.49 mg/kg dw). In adult raccoons, Hg concentrations in the liver, kidney, and brain were higher than in immature individuals (p<0.001), while similar in skeletal muscle in both age groups. Our results are consistent with studies by other authors conducted in North America in areas with similar environmental conditions. PMID:24736978

Lanocha, Natalia; Kalisinska, Elzbieta; Kosik-Bogacka, Danuta I; Budis, Halina; Podlasinska, Joanna; Jedrzejewska, Ewa

2014-06-01

456

Parasitological survey on wild carnivora in north-western Tohoku, Japan.  

PubMed

In the winter of 1997-1998, we collected parasitological data from 60 wild carnivora in the north-western part of Tohoku region, Japan. These included 7 foxes (Vulpes vulpes japonica), 20 raccoon dogs (Nyctereutes procyonoides viverrinus), 29 martens (Martes melampus melampus), 3 weasels (two Mustela sibirica itatsi and one M. nivalis namiyei), and one Japanese badger (Meles meles anakuma). Roundworms (Toxocara canis in foxes and Toxocara tanuki in raccoon dogs), hookworms (Ancylostoma kusimaense and Arthrostoma miyazakiense) and Molineus sp. in the small intestine were the most prevalent in foxes and raccoon dogs. In martens, Aonchotheca putorii in the stomach, Concinnum ten in the pancreatic duct, Molineus sp. and Euryhelmis costaricensis in the small intestine were the most prevalent. Collected parasites include some new helminth species for this region or Japan; the strobilar stage of Taenia polyacantha from foxes, Pygidliopsis summa from a raccoon dog, Eucoleus aerophilus, A. putorii, and Soholiphyme baturini from martens. PMID:10535507

Sato, H; Inaba, T; Ihama, Y; Kamiya, H

1999-09-01

457

Crustal Thickness and Lithospheric Structure in Northwestern Namibia from the WALPASS experiment  

NASA Astrophysics Data System (ADS)

An amphibian passive-source seismic network (WALPASS) have been deployed for a period of two years in the area where the Walvis Ridge intersects with the continental margin of northwestern Namibia. The deployment was intended to study and map the lithospheric and upper mantle structure in the ocean-continent transition beneath the passive continental margin. The main idea is to find seismic anomalies related to the postulated hotspot track from the continent to the ocean along the Walvis Ridge that links the Etendeka continental flood-basalt province to the Tristan da Cunha hotspot in the middle Atlantic ocean. This could provide clues that help us to better understand the role of plume-lithosphere interaction during the continental break-up. We present here first estimates of crustal and lithospheric thicknesses along with a map of distribution of local seismicity in this geophysically little studied region.

Heit, Benjamin; Yuan, Xiaohui; Geissler, Wolfram; Lushetile, Bufelo; Weber, Michael; Jokat, Wilfried

2013-04-01

458

[Spatial structure of natural foci of hantavirus on the territory of Northwestern Caucasus].  

PubMed

For the period from 2001 to 2011 zoological and epizootological studies in more than 100 points of Northwestern Caucasus including territories of Krasnodar Region and Republic of Adygea were carried out. 8723 specimens of small mammals represented by 20 rodent species and 7 insectivorous species were captured and examined. Organs and blood from 5057 specimens of creatures were studied for hantavirus infection. The presence of natural foci of circulation of 2 species of hantavirus--Dobrava/Belgrade and Tula--was established. Sochi viruses and presumably Kurkin with main natural hosts--Caucasian wood and field mice belong to the first species. Tula and Adler viruses with the main host--Microtus genus vole belong to the second species. Quantitative characteristics of infection of small mammals of various species during different seasons and years on the examined territories were obtained, that allowed to create a map of allocation of foci of hantavirus circulation that differ by structure. PMID:24605654

Okulova, N M; Khliap, L A; Varshavski?, A A; Dzagurova, T K; Iunicheva, Iu V; Riabova, T E; Baskevich, M I; Vasilenko, L E; Tkachenko, E A

2013-01-01

459

Jurassic normal and strike-slip faults at Crater Island, northwestern Utah  

USGS Publications Warehouse

At Crater Island, northern Silver Island Mountains, northwestern Utah, an unbroken Tertiary fault block within the Basin and Range province exhibits Jurassic or older structures that are virtually unmodified by subsequent tectonism. Widespread high-angle faults, mainly striking north and north-east, offset the moderately west-dipping strata down to the west, thereby extending the strata parallel to bedding by 10% to 20%. The normal faults merge with a north northwest dextral strike-slip fault system. The two fault systems are kinematically compatible, suggesting that they may have been contemporaneous. The data indicate that minor thrusting, probably during the Jurassic, was followed by extensional faulting within a strike-slip fault system, probably close in time to intrusion. -from Authors

Miller, D.M.; Allmendinger, R.W.

1991-01-01

460

SALINITY AND SODICITY INTERACTIONS OF WEATHERED MINESOILS IN NORTHWESTERN NEW MEXICO AND NORTH EASTERN ARIZONA  

SciTech Connect

Weathering characteristics of minesoils and rooting patterns of key shrub and grass species were evaluated at sites reclaimed for 6 to 14 years from three surface coal mine operations in northwestern New Mexico and northeastern Arizona. Non-weathered minesoils were grouped into 11 classifications based on electrical conductivity (EC) and sodium adsorption ratio (SAR). Comparisons of saturated paste extracts, from non-weathered and weathered minesoils show significant (p < 0.05) reductions in SAR levels and increased EC. Weathering increased the apparent stability of saline and sodic minesoils thereby reducing concerns of aggregate slaking and clay particle dispersion. Root density of four-wing saltbush (Atriplex canascens), alkali sacaton (Sporobolus airoides), and Russian wildrye (Psathyrostachys junceus) were nominally affected by increasing EC and SAR levels in minesoil. Results suggest that saline and sodic minesoils can be successfully reclaimed when covered with topsoil and seeded with salt tolerant plant species.

Brent Musslewhite; Song Jin

2006-05-01

461

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific.  

PubMed

We used 344 mitochondrial control region (717?bp) sequences from the finless porpoise (genus Neophocaena) from the northwestern Pacific to investigate the extent and manner in which past climatic oscillations may have shaped patterns of genetic diversity for this marine mammal. Both SplitsTree and Analysis of Molecular Variance (AMOVA) revealed the presence of a deep divergence among N. phocaenoides in subtropical waters compared with N. asiaeorientalis in temperate waters. Results from Migrate-n indicated that migration increased along the continent during the early Pleistocene period. Migration increased, although to a lesser extent than that during the Pleistocene, along the marginal shelf in the Yellow/Bohai Sea during the Last Glacial Maximum (LGM) due to a shortening coastline. Our results suggest that the current patterns of genetic diversity of Neophocaena vary at a hierarchy on a temporal and spatial scale, and phylogeographic history should be taken into account when examining species population structure and taxonomy. PMID:25303422

Lin, Wenzhi; Frère, Céline H; Karczmarski, Leszek; Xia, Jia; Gui, Duan; Wu, Yuping

2014-01-01

462

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific  

PubMed Central

We used 344 mitochondrial control region (717?bp) sequences from the finless porpoise (genus Neophocaena) from the northwestern Pacific to investigate the extent and manner in which past climatic oscillations may have shaped patterns of genetic diversity for this marine mammal. Both SplitsTree and Analysis of Molecular Variance (AMOVA) revealed the presence of a deep divergence among N. phocaenoides in subtropical waters compared with N. asiaeorientalis in temperate waters. Results from Migrate-n indicated that migration increased along the continent during the early Pleistocene period. Migration increased, although to a lesser extent than that during the Pleistocene, along the marginal shelf in the Yellow/Bohai Sea during the Last Glacial Maximum (LGM) due to a shortening coastline. Our results suggest that the current patterns of genetic diversity of Neophocaena vary at a hierarchy on a temporal and spatial scale, and phylogeographic history should be taken into account when examining species population structure and taxonomy. PMID:25303422

Lin, Wenzhi; Frère, Céline H.; Karczmarski, Leszek; Xia, Jia; Gui, Duan; Wu, Yuping

2014-01-01

463

Holocene vegetation histories from three sites in the Tundra of Northwestern Quebec, Canada  

SciTech Connect

Two pollen diagrams from lakes north of treeline in northwestern Quebec indicate that Picea never extended north of its present-day limit during the past 6000 yr BP. Alnus crispa was slightly more abundant around 5000 BP, but there are few major changes in the vegetation of the region during the Holocene. A third site in the tundra along Hudson Bay has a slightly longer sequence (7000 yr BP) which indicates more open conditions in the early and recent part of the record. Picea may have been more abundant locally around 3000 BP. Few major changes in these diagrams can be unequivocally attributed to local changes in plant abundance; changes in tree and shrub pollen abundance parallel those seen south of treeline.

Gajewski, K. (Univ. d'Ottawa, Ontario (Canada)); Garralla, S.

1992-11-01

464

Bacillus thuringiensis in caterpillars and associated materials collected from protected tropical forests in northwestern Costa Rica.  

PubMed

Bacillus thuringiensis (Bt) synthesizes crystalline inclusions that are toxic to caterpillars (Lepidoptera) and other orders of invertebrates. Materials associated with 37 caterpillars from 16 species, collected while feeding on 15 different species of host plants in dry, cloud and rain forests located in the Area de Conservación Guanacaste in northwestern Costa Rica, were examined for the presence of Bt. From a total of 101 derived samples, 25 Bt isolates were cultured: 56% from host plant leaves, 8% from caterpillar guts and 36% from caterpillar fecal pellets. Bt was isolated from at least one sample in 38% of the systems constituted by the food plant, gut and fecal pellets corresponding to a single caterpillar. Four different morphologies of crystalline inclusions were observed, with bipyramidal and irregular crystal morphologies being the most prevalent. PMID:18494297

Rodríguez-Sánchez, César; Sittenfeld, Ana; Janzen, Daniel H; Espinoza, Ana M

2006-06-01

465

High-resolution holocene environmental changes in the thar desert, northwestern india  

PubMed

Sediments from Lunkaransar dry lake in northwestern India reveal regional water table and lake level fluctuations over decades to centuries during the Holocene that are attributed to changes in the southwestern Indian monsoon rains. The lake levels were very shallow and fluctuated often in the early Holocene and then rose abruptly around 6300 carbon-14 years before the present (14C yr B.P.). The lake completely desiccated around 4800 (14)C yr B.P. The end of this 1500-year wet period coincided with a period of intense dune destabilization. The major Harrapan-Indus civilization began and flourished in this region 1000 years after desiccation of the lake during arid climate and was not synchronous with the lacustral phase. PMID:10102808

Enzel; Ely; Mishra; Ramesh; Amit; Lazar; Rajaguru; Baker; Sandler

1999-04-01

466

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific  

NASA Astrophysics Data System (ADS)

We used 344 mitochondrial control region (717 bp) sequences from the finless porpoise (genus Neophocaena) from the northwestern Pacific to investigate the extent and manner in which past climatic oscillations may have shaped patterns of genetic diversity for this marine mammal. Both SplitsTree and Analysis of Molecular Variance (AMOVA) revealed the presence of a deep divergence among N. phocaenoides in subtropical waters compared with N. asiaeorientalis in temperate waters. Results from Migrate-n indicated that migration increased along the continent during the early Pleistocene period. Migration increased, although to a lesser extent than that during the Pleistocene, along the marginal shelf in the Yellow/Bohai Sea during the Last Glacial Maximum (LGM) due to a shortening coastline. Our results suggest that the current patterns of genetic diversity of Neophocaena vary at a hierarchy on a temporal and spatial scale, and phylogeographic history should be taken into account when examining species population structure and taxonomy.

Lin, Wenzhi; Frère, Céline H.; Karczmarski, Leszek; Xia, Jia; Gui, Duan; Wu, Yuping

2014-10-01

467

A new species of Paratanais Dana, 1852 (Crustacea, Peracarida, Tanaidacea, Paratanaidae) from Puerto Rico, northwestern Atlantic  

PubMed Central

Abstract Paratanais rosadi sp. n. described from Puerto Rican coastal waters represents the first species of the genus from the northwestern Atlantic. It is distinguished from the other Paratanais species by a combination of characters, including article-2 of the maxilliped palp with a geniculate, finely-serrulate seta on inner margin; chela with stiff, geniculate, seta arising from propodus between fixed finger and dactylus and with short, stout, finely serrulate, seta on inner distal face of propodus adjacent to base of dactylus; carpus of pereopods 4?6 having three, instead of four stout modified spiniform setae distally, uropodal exopod distinctly shorter than endopodal article-1; and uropodal endopod with articles of about of equal in length. A key for the separation of Paratanais species from the Atlantic Ocean is presented. PMID:24715797

Morales-Núñez, Andrés G.; Heard, Richard W.

2014-01-01

468

Picocyanobacterial abundances and diversity in surface water of the northwestern Pacific Ocean  

NASA Astrophysics Data System (ADS)

To understand picocyanobacterial distribution patterns in the northwestern Pacific Ocean, their abundances and genetic diversity were studied using flow cytometry and a barcoded amplicon pyrosequencing approach. At open ocean stations affected by the North Equatorial Current, Prochlorococcus was the predominant picocyanobacteria, and a high-light-adapted ecotype (HLII) made up most of the population. In contrast, at stations in shelf areas of the East China Sea (ECS) and South Sea, Synechococcus was the predominant picocyanobacteria and clade II was dominant. At other ECS stations affected by the Kuroshio Current, both Prochlorococcus and Synechococcus made up similar proportions of the picocyanobacterial community. These results indicate that picocyanobacterial diversity differs among oceanic regions, and that physicochemical properties related to dominant water masses, seem to be important in determining picocyanobacterial diversity.

Choi, Dong Han; Noh, Jae Hoon; Hahm, Mi-Seon; Lee, Charity Mijin

2011-12-01

469

Water vapor and surface observations in northwestern Mexico during the 2004 NAME Enhanced Observing Period  

NASA Astrophysics Data System (ADS)

We report on precipitable water vapor (PWV) from a Global Positioning System (GPS) receiver and surface meteorological network during the 2004 North American Monsoon Experiment (NAME) in northwestern Mexico. The monsoon onset is evident as a large PWV increase over several days beginning July 1. Data in the Sierra Madre Occidental (SMO) foothills reveal a dynamical transition in mid-August from smaller, sub-synoptic scale to larger, synoptic scale moisture structure. During the Sub-synoptic phase in the SMO foothills, a positive feedback operates where near-daily precipitation supplied moisture maintains 15% higher surface mixing ratios that lower the lifting condensation level facilitating initiation of moist convection. Along the western edge of the SMO, precipitation typically occurs hours after the local temperature maximum, triggered by westward propagating convective disturbances. Precipitation is typically preceded by a rapid rise in PWV and sharp decrease in surface temperature, implying models must include moist convective downdrafts in the NAM area.

Kursinski, E. R.; Bennett, R. A.; Gochis, D.; Gutman, S. I.; Holub, K. L.; Mastaler, R.; Minjarez Sosa, C.; Minjarez Sosa, I.; van Hove, T.

2008-02-01

470

The Northwestern Anagram Test: Measuring Sentence Production in Primary Progressive Aphasia  

PubMed Central

Primary progressive aphasia (PPA) is a clinical dementia syndrome with early symptoms of language dysfunction. Post mortem findings are varied and include Alzheimer’s disease and frontotemporal lobar degeneration (FTLD), both tauopathies and TDP-43 proteinopathies. Clinical-pathologic correlations in PPA are complex but the presence in the clinical profile of agrammatism has a high association with tauopathy. Grammatical competence is difficult to assess in the clinical setting with available methods. This paper describes the Northwestern Anagram Test (NAT), a new clinical measure of sentence production. Sixteen patients with PPA and their controls assembled single printed words to create sentences describing pictures. NAT performance was significantly correlated with a measure of sentence production and with aphasia severity, but not with measures of naming, single word comprehension, object recognition or motor speech. The NAT can be used to assess syntax competence when patients cannot be tested with measures that requiring intact speech production. PMID:19700669

Weintraub, Sandra; Mesulam, M.-Marsel; Wieneke, Christina; Rademaker, Alfred; Rogalski, Emily J.; Thompson, Cynthia K.

2009-01-01

471

Factors associated with self-reported symptoms of acute pesticide poisoning among farmers in northwestern Jamaica  

PubMed Central

Pesticide poisoning is a major public health concern in developing countries. We conducted a population survey among farmers in three parishes of northwestern Jamaica to determine the occurrence of acute pesticide poisoning and to identify factors associated with pesticide poisoning. Approximately 16% of 359 farmers who participated in the study reported one or more incidents of acute pesticide poisoning within the last two years. Only 25% of the farmers reported ever receiving training in pesticide handling or safety. The majority (68%) of farmers who reported pesticide poisoning never sought medical attention for poisoning. The factors found to be associated with pesticide poisoning in this study indicate that implementation of specific intervention strategies and education of farmers is needed in order to improve safe handling, use and disposal of pesticides and reduce incidents of acute pesticide poisoning. PMID:24484363

Ncube, Ngqabutho M.; Fogo, Christopher; Bessler, Patricia; Jolly, Curtis M.; Jolly, Pauline E.

2011-01-01

472

Ground-water recharge through active sand dunes in northwestern Nevada  

USGS Publications Warehouse

Most water-resource investigations in semiarid basins of the Great Basin in western North America conclude that ground-water recharge from direct precipitation on the valley floor is negligible. However, many of these basins contain large areas covered by unvegetated, active sand dunes that may act as conduits for ground-water recharge. The potential for this previously undocumented recharge was investigated in an area covered by sand dunes in Desert Valley, northwestern Nevada, using a deep percolation model. The model uses daily measurements of precipitation and temperature to determine energy and moisture balance, from which estimates of long-term mean annual recharge are made. For the study area, the model calculated a mean annual recharge rate of as much as 1.3 inches per year, or 17 percent of the long-term mean precipitation. Model simulations also indicate that recharge would be virtually zero if the study area were covered by vegetation rather than dunes.

Berger, D.L.

1992-01-01

473

Difference of mercury bioaccumulation in red mullets from the north-western Mediterranean and Black seas.  

PubMed

The relationships between total mercury (Hg) concentration and stable nitrogen isotope ratio (delta(15)N) were evaluated in Mullus barbatus barbatus and M. surmuletus from the Mediterranean Sea and M. barbatus ponticus from the Black Sea. Mercury concentration in fish muscle was six times higher in the two Mediterranean species than in the Black Sea one for similar sized animals. A positive correlation between Hg concentration and delta(15)N occurred in all species. Increase in Hg concentration with delta(15)N was high and similar in the two Mediterranean fishes and much lower in the Black Sea species. Since this was neither related to trophic level difference between species nor to methylmercury (MeHg) concentration differences between the north-western Mediterranean and the Black Sea waters, we suggested that the higher primary production of the Black Sea induced a dilution of MeHg concentration at the base of the food webs. PMID:19201429

Harmelin-Vivien, M; Cossa, D; Crochet, S; B?naru, D; Letourneur, Y; Mellon-Duval, C

2009-05-01

474

Weather forecast in north-western Greece: RISKMED warnings and verification of MM5 model  

NASA Astrophysics Data System (ADS)

The meteorological model MM5 is applied operationally for the area of north-western Greece for one-year period (1 June 2007-31 May 2008). The model output is used for daily weather forecasting over the area. An early warning system is developed, by dividing the study area in 16 sub-regions and defining specific thresholds for issuing alerts for adverse weather phenomena. The verification of the model is carried out by comparing the model results with observations from three automatic meteorological stations. For air temperature and wind speed, correlation coefficients and biases are calculated, revealing that there is a significant overestimation of the early morning air temperature. For precipitation amount, yes/no contingency tables are constructed for 4 specific thresholds and some categorical statistics are applied, showing that the prediction of precipitation in the area under study is generally satisfactory. Finally, the thunderstorm warnings issued by the system are verified against the observed lightning activity.

Bartzokas, A.; Kotroni, V.; Lagouvardos, K.; Lolis, C. J.; Gkikas, A.; Tsirogianni, M. I.

2010-02-01

475

Eriophyoid mites from Qinghai Province, northwestern China with descriptions of nine new species (Acari, Eriophyoidea).  

PubMed

Eriophyoid mites from Qinghai Province, northwestern China were studied herein. Up to now, only six species have been reported from Qinghai Province. In field surveys, 17 eriophyoid mite species were collected, among which nine species were found new to science. The new species and their host plants are listed as follows: Acaphyllisa tuberculumaesp. n. on Populus sp. (Salicaceae); Proiectus xiningensissp. n. on Pinus sp. (Pinaceae); Phyllocoptes beishaniensissp. n. on Spiraea mongolica Maxim. (Rosaceae); Tetra prunianasp. n. on Prunus tomentosa Thunb. (Rosaceae) Rupr. (Berberidaceae); Tetra pyrianasp. n. on Pyrus calleryana Decne. (Rosaceae); Tetra simoniasp. n. on Populus simonii Carr. (Salicaceae); Diptacus berberinussp. n. on Berberis amurensis Rupr. (Berberidaceae); Diptacus mengdaensissp. n. on Lonicera elisae Franch. (Caprifoliaceae); Rhyncaphytoptus spinussp. n. on Lonicera rupicola Hook. f. et Thoms. (Caprifoliaceae). Aculops ulmi Hong & Xue, 2005 was re-described. PMID:22679390

Li, Hao-Sen; Xue, Xiao-Feng; Hong, Xiao-Yue

2012-01-01

476

Distribution of the amphibian pathogen Batrachochytrium dendrobatidis in the Pacific Northwestern USA  

USGS Publications Warehouse

Chytridiomycosis (infection by the fungus Batrachochytrium dendrobatidis) has been associated with amphibian declines in at least four continents. We report results of disease screens from 210 pond-breeding amphibians from 37 field sites in Oregon and Washington. We detected B. dendrobatidis on 28% of sampled amphibians, and we found a?Y 1 detection of B. dendrobatidis from 43% of sites. Four of seven species tested positive for B. dendrobatidis, including the Northern Red-Legged Frog (Rana aurora), Columbia Spotted Frog (Rana luteiventris), and Oregon Spotted Frog (Rana pretiosa). We also detected B. dendrobatidis in nonnative American Bullfrogs (Rana catesbeiana) from six sites in western and central Oregon. Our study and other recently published findings suggest that B. dendrobatidis has few geographic and host taxa limitations among North American anurans. Further research on virulence, transmissibility, persistence, and interactions with other stressors is needed to assess the potential impact of B. dendrobatidis on Pacific Northwestern amphibians.

Pearl, Christopher A.; Bull, E.L.; Green, D.E.; Bowerman, Jay; Adams, Michael J.; Hyatt, A.; Wente, W.

2007-01-01

477

Historical pattern and mass balance of trace metals in sediments of the northwestern Adriatic Sea Shelf.  

PubMed

In view of the recent action in Marine Strategy Framework Directive, reconstructing the history of anthropogenic metal inputs and calculating the budgets for the northwestern part of the Italian Adriatic basin can provide a benchmark for comparison with new evidences and enlighten recent environmental changes. Among the metals, the attention was focused on Pb and Zn, as they provide the most significant anthropogenic signals. In 1988, areal distributions clearly identified the Po, Adige and Brenta rivers as the main sources of contaminants. The study area was divided in three compartments. The area in front of the Po delta represented a sink for metals but the accumulation of Zn and Pb integrated over the entire study area suggests an effective export throughout southern boundary. Most concentration-depth/year profiles in cores showed an upward increase from the Italian Unification (1861), with a still significant anthropogenic supply at the time of sampling. PMID:24119313

Romano, Stefania; Langone, Leonardo; Frignani, Mauro; Albertazzi, Sonia; Focaccia, Paola; Bellucci, Luca Giorgio; Ravaioli, Mariangela

2013-11-15

478

Transmission cycles of Borrelia burgdorferi and B. bissettii in relation to habitat type in northwestern California  

PubMed Central

This study was undertaken to determine which rodent species serve as primary reservoirs for the Lyme disease spirochete Borrelia burgdorferi in commonly occurring woodland types in inland areas of northwestern California, and to examine whether chaparral or grassland serve as source habitats for dispersal of B. burgdorferi- or B. bissettii-infected rodents into adjacent woodlands. The western gray squirrel (Sciurus griseus) was commonly infected with B. burgdorferi in oak woodlands, whereas examination of 30 dusky-footed woodrats (Neotoma fuscipes) and 280 Peromyscus spp. mice from 13 widely spaced Mendocino County woodlands during 2002 and 2003 yielded only one infected woodrat and one infected deer mouse (P. maniculatus). These data suggest that western gray squirrels account for the majority of production by rodents of fed Ixodes pacificus larvae infected with B. burgdorferi in the woodlands sampled. Infections with B. burgdorferi also were rare in woodrats (0/47, 0/3) and mice (3/66, 1/6) captured in chaparral and grassland, respectively, and therefore these habitats are unlikely sources for dispersal of this spirochete into adjacent woodlands. On the other hand, B. bissettii was commonly detected in both woodrats (22/47) and mice (15/66) in chaparral. We conclude that the data from this and previous studies in northwestern California are suggestive of a pattern where inland oak-woodland habitats harbor a B. burgdorferi transmission cycle driven primarily by I. pacificus and western gray squirrels, whereas chaparral habitats contain a B. bissettii transmission cycle perpetuated largely by I. spinipalpis, woodrats and Peromyscus mice. The dominant role of western gray squirrels as reservoirs of B. burgdorferi in certain woodlands offers intriguing opportunities for preventing Lyme disease by targeting these animals by means of either host-targeted acaricides or oral vaccination against B. burgdorferi. PMID:20514140

Eisen, Lars; Eisen, Rebecca J.; Mun, Jeomhee; Salkeld, Daniel J.; Lane, Robert S.

2008-01-01

479

Cultural Transmission of Traditional Knowledge in two populations of North-western Patagonia  

PubMed Central

Background In the present study we have investigated the cultural transmission of two types of traditional plant knowledge in two communities of North-western Patagonia, Argentina. In the Pilcaniyeu community, we studied the transmission of traditional knowledge related to horticultural practices in home-gardens, greenhouses and gardens; while in the community of Cuyin Manzano, we studied wild plant gathering customs. Methods Ethnobotanical fieldwork was conducted by means of semi-structured interviews, in which we investigated which plants are used, at what life history phase was learned, modes of transmission and who the principal transmitters were in childhood and adulthood. In both communities, each of this three aspects related to cultural transmission were categorized and the frequencies of each category were obtained. The total number of species recorded in each community was also calculated. Frequencies were analyzed with the Chi-square test of independence. Results and discussion In both communities, transmission of traditional plant knowledge begins at an early age, as a family custom, in which women play a predominant role. Wild plant use and horticultural knowledge continue to be learned during adulthood. This was particularly registered associated with horticultural learning, which receives greater influence from extension agents who are introducing new practices and technology. This outside influence, which implies novelty, could imply syncretism but also traditional knowledge loss. Conclusion Given the remarkable acculturation processes occurring at present in rural communities of Northwestern Patagonia, it might be of vital importance to document traditional knowledge of ancient practices. Moreover, it could be interesting to share our results with both populations in order to encourage participatory activities within the communities which could enhance traditional knowledge horizontal transmission, particularly among elder adults and youngsters. PMID:19077315

Eyssartier, Cecilia; Ladio, Ana H; Lozada, Mariana

2008-01-01

480

Mosquito surveillance in northwestern Italy to monitor the occurrence of tropical vector-borne diseases.  

PubMed

Mosquito-borne arboviruses (MBV) represent an important health problem, causing diseases and deaths both in human and animals mainly in tropical and subtropical countries. In recent years, they have emerged also in temperate regions where they have caused epidemics. Of mounting concern among public health authorities in Europe are zoonotic mosquito-borne viruses belonging to the Flavivirus genus. The aim of this study was to carry out active surveillance on mosquitoes in two regions of northwestern Italy (Liguria and Piedmont) to gain a better knowledge of the mosquito populations by identifying potential vectors of arboviruses and to investigate arbovirus infection. A network of 61 CO? CDC traps was placed in the study area; sampling was conducted from May to October 2011. A total of 46,677 mosquitoes was collected, identified to species level, and classified according to their vector competence. Mosquitoes collected from 16 traps, selected according to risk-based factors, were tested by biomolecular analysis to detect flavivirus infection. This study highlights the importance of entomological surveillance in northwestern Italy because most of the mosquitoes collected were found to have high vector competence. Moreover, the risk-based virological surveillance allowed to detect the presence of mosquito flavivirus RNA, phylogenetically closely related to the MMV Spanish isolate, in three pools and USUV RNA in one pool in new areas where it has not been reported previously. The availability of continuous data on mosquito populations provides invaluable information for use in cases of an epidemic emergency. Maintenance of this integrated system for the next years will provide stronger data that can inform the design of a risk-based surveillance for the early detection of the occurrence of outbreaks of tropical MBDs. PMID:24589116

Pautasso, A; Desiato, R; Bertolini, S; Vitale, N; Radaelli, M C; Mancini, M; Rizzo, F; Mosca, A; Calzolari, M; Prearo, M; Mandola, M L; Maurella, C; Mignone, W; Chiavacci, L; Casalone, C

2013-11-01