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Sample records for 9fig 10fig 11fig

  1. Angiographic studies of quinton—scribner arteriovenous cannulae

    PubMed Central

    Dathan, J. R.; Thompson, J. M. A.; Worthington, B. S.

    1969-01-01

    An analysis of 86 angiographic studies of Quinton–Scribner shunts has shown that these may be very useful in determining the cause and helping in the management of poorly functioning cannulae in patients on regular haemodialysis treatment. ImagesFig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8 PMID:5822081

  2. Presidential Address: The Woman in the Case Jane Todd Crawford, 1763-1842

    PubMed Central

    Sparkman, Robert S.

    1979-01-01

    The 1978 Presidential Address of the Southern Surgical Association is dedicated to the wives of the members, past and present, in acknowledgment and appreciation of the enduring contribution that they have made to the quality and character of this association. ImagesFig. 1.Fig. 3.Fig. 4.Fig. 5.Fig. 7.Fig. 8.Fig. 9.Fig. 10.Fig. 11.Fig. 12.Fig. 13.Fig. 14.Fig. 15.Fig. 16.Fig. 17.Fig. 18.Fig. 19.Fig. 20. PMID:375854

  3. Urinary Tract Refunctionalization After Prior Diversion in Children

    PubMed Central

    Hendren, W. Hardy

    1974-01-01

    Thirty-two children who had undergone previous urinary diversion were operated upon to refunctionalize the bladder. In 24 the diversion had been considered permanent, and in eight, temporary. Success in these procedures suggests that many young patients deserve a second look for possible “undiversion.” ImagesFig. 6.Fig. 7.Fig. 8.Fig. 9.Fig. 10.Fig. 11.Fig. 12.Fig. 13.Fig. 14.Fig. 15.Fig. 16.Fig. 17a.Fig. 17b.Fig. 18. PMID:4416811

  4. Tumours of the nasal cavity*

    PubMed Central

    Stünzi, H.; Hauser, B.

    1976-01-01

    Tumours of the nasal cavity are rare in domestic animals, most cases occurring in the dog. Epithelial tumours are the most common type in carnivores (dogs and cats). In general, the same types of tumour occur in domestic animals as occur in man. There was no significant predisposition for breed in dogs, but in both dogs and cats far more males than females were affected. Metastases occurred only rarely. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 9Fig. 10Fig. 11Fig. 12Fig. 5Fig. 6Fig. 7Fig. 8 PMID:1086156

  5. The respiratory epithelium of the lung in the green turtle (Chelonia mydas L.).

    PubMed Central

    Solomon, S E; Purton, M

    1984-01-01

    The chelonian lung exhibits reptilian, mammalian and avian features. The respiratory epithelium is typically vertebrate, i.e. pseudostratified columnar with cilia; gaseous exchange areas appear at all levels from the respiratory bronchi down to the alveoli. The latter are invested with a capillary network and both type I and type II cells are present. The possible functional significance of the distribution of collagen, elastic tissue, cartilage and smooth muscle is discussed. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 PMID:6490523

  6. A Mini-Atlas of Ear-drum Pathology

    PubMed Central

    Hawke, Michael; Kwok, Peter

    1987-01-01

    The authors provide a number of ear-drum pictures and identify and discuss diseases affecting the external ear canal, the tympanic membrane and middle ear. They also deal with the removal of foreign bodies from the external canal, perforation of the tympanic membrane, and the use of an artificial ventilation tube. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17Fig. 18 PMID:21263886

  7. Pseudocyst of the head of the pancreas: relationship to the duct of Santorini.

    PubMed Central

    Anderson, M C

    1979-01-01

    A series of 14 patients with chronic alcoholic pancreatitis is presented which illustrates that cysts originating in the superior segment of the head of the pancreas communicate with the duct of Santorini which normally drains this area of the gland. Cysts in this location do not communicate with the major pancreatic duct (Wirsung) in most instances, and therefore may be overlooked in the standard retrograde drainage procedures employed to relieve pancreatic exocrine obstruction. Images Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. PMID:518172

  8. Apical disease: an analysis of diagnosis and management with special reference to root lesion resection and pathology.

    PubMed Central

    Winstock, D.

    1980-01-01

    Apical disease is discussed against a background of a hitherto assumed high percentage of cystic and bacteriologically sterile lesions, both these concepts being challenged by the author's own investigations. Techniques are described for posterior root resection with emphasis on the conservability of apically diseased teeth, even in the presence of systemic diseases. Open operation is suggested for the diagnosis and treatment of apical disease. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:7396345

  9. Orthotics in Sports Shoes

    PubMed Central

    Schamberger, Wolf

    1983-01-01

    We are all born with a varying assortment of biomechanical discrepancies. Ordinarily these may be of no consequence, but to those who try to achieve excellence in a certain sport these discrepancies can spell the difference between success and failure. Some athletes may have to accept the fact that biomechanically the odds are against them ever becoming excellent and that intensive training may in fact be detrimental to their wellbeing. However, the majority can be helped with advice on proper shoe wear and orthotic correction. This article highlights the role of foot orthotics as indicated for various biomechanically-related problems commonly encountered in athletes. ImagesFig. 5Fig. 6Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 15Fig. 16Fig. 18Fig. 19Fig. 20Fig. 21Fig. 22Fig. 23 PMID:21283401

  10. Electrical apparatus used in medicine before 1900.

    PubMed Central

    Cambridge, N A

    1977-01-01

    The Ancients had at their disposal torpedo fish, amber and magnets. It was not until the sixteenth century that ideas on the strange behaviour of amber and magnets were put forward. The eighteenth century saw the application of Newton's theories of matter and the introduction of the electrostatic machine, Galvanism and Volta's battery. In the nineteenth century there was extensive application of electricity in medical practice, with the development of electrocautery apparatus and illuminated cystoscopes, the pioneering of the electrocardiogram and the discovery of X-rays. Images Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 Fig 12 PMID:335397

  11. Dupuytren's Contracture: Fibroblast Contraction?

    PubMed Central

    Gabbiani, Giulio; Majno, Guido

    1972-01-01

    In 6 cases of Dupuytren's disease and 1 of Ledderhose's disease, the nodules of the palmar and plantar aponeurosis were examined by light and electron microscopy. The cells composing these nodules, presumably fibroblasts, showed three significant ultrastructural features: (1) a fibrillar system similar to that of smooth muscle cells; (2) nuclear deformations such as are found in contracted cells, the severest being recognizable by light microscopy (cross-banded nuclei); (3) cell-to-cell and cell-to-stroma attachments. Based on these data and on recent information about the biology of the fibroblasts, it is suggested that these cells are fibroblasts that have modulated into contractile cells (myofibroblasts), and that their contraction plays a role in the pathogenesis of the contracture observed clinically. ImagesFig 10Fig 5Fig 11Fig 6 and 7Fig 8Fig 1Fig 2Fig 9Fig 3Fig 4 PMID:5009249

  12. Connective tissue responses to some heavy metals. II. Lead: histology and ultrastructure.

    PubMed Central

    Ellender, G.; Ham, K. N.

    1987-01-01

    Lead loaded ion exchange resin beads implanted into the loose connective tissue of the rat pinna induced local lesions which differed widely from those of the control (sodium loaded) beads (Ellender & Ham 1987). These lesions were characterized by changes in the granulation tissue and the approximating connective tissue. Granulation tissue contained mononuclear phagocytes in various guises, and some cells with intranuclear inclusion bodies. The matrix of the granulation tissue contained collagen fibrils having a wide range of diameters suggestive of altered collagen biosynthesis. Foci of collagen mineralization occurred in zones of combined trauma and lead impregnation. Once mineralized they became enveloped by giant cells and epithelioid cells. Lead in damaged tissues is thought to modify the protective mechanism of calcification inhibition and the biosynthesis of the matrix. Images Fig. 6 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:3040063

  13. Functional Plyometric Exercises for the Throwing Athlete

    PubMed Central

    Pezzullo, David J.; Karas, Steven; Irrgang, James J

    1995-01-01

    In this article we provide athletic health care professionals with a variety of functional strengthening exercises to use in improving the muscular strength of the throwing athlete's shoulder. Upper extremity functional plyometric exercise in sport-specific patterns can be an important component of a throwing athlete's rehabilitation. We discuss several plyometric exercises, using the Inertial Exercise System, the Plyo-ball, and the Theraband. Proper use of these exercises can facilitate a safe and progressive rehabilitation program for the injured, throwing athlete. After the athlete has successfully completed the functional plyometric exercises, a throwing progression can be initiated. ImagesFig 1.Fig 2.Fig 3.Fig 4.Fig 5.Fig 6.Fig 7.Fig 8.Fig 9.Fig 10.Fig 11.Fig 12.Fig 13.Fig 14.Fig 15. PMID:16558304

  14. Incidence and structure of the appendices of the testis and epididymis.

    PubMed Central

    Sahni, D; Jit, I; Joshi, K; Sanjeev

    1996-01-01

    In paired tests obtained from 425 adults, 50 children and 10 neonates, the incidence of testicular appendices was 76% in adults (93.3% sessile) and 83.3% in neonates/children (88% sessile). An epididymal appendix was present in 21.9% of adults and 20% of neonates/children, out of which 79% were stalked in both types of specimen. Three sessile testicular appendices and 11 epididymal appendices were double. The microscopic structure of the appendices and the ultrastructure of their epithelia are described. Testicular or epididymal appendices were not present in any domestic or laboratory animal examined except the horse. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:8886956

  15. The endocrine polypeptide cells of the human stomach, duodenum, and jejunum

    PubMed Central

    Pearse, A. G. E.; Coulling, I.; Weavers, B.; Friesen, S.

    1970-01-01

    Thirty specimens of stomach, duodenum, and jejunum, removed at operation, were examined by optical microscopical, cytochemical, and electron microscopical techniques. The overall distribution of four types of endocrine polypeptide cell in the stomach, and three in the intestine, was determined. The seven cell types are described by names and letters belonging to a scheme for nomenclature agreed upon at the 1969 Wiesbaden conference on gastrointestinal hormones. The gastrin-secreting G cell was the only cell for which firm identification with a known hormone was possible. Although there was wide variation in the distribution of the various cells, from one case to another, striking differences were nevertheless observable, with respect to the G cell, between antra from carcinoma and from ulcer cases. ImagesFig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17 PMID:4919258

  16. A collagen and elastic network in the wing of the bat.

    PubMed Central

    Holbrook, K A; Odland, G F

    1978-01-01

    Bundles of collagen fibrils, elastic fibres and fibroblasts are organized into a network that lies in the plane of a large portion of the bat wing. By ultrastructural (TEM and SEM) and biochemical analyses it was found that individual bundles of the net are similar to elastic ligaments. Although elastic fibres predominate, they are integrated and aligned in parallel with small bundles of collagen. A reticulum of fibroblasts, joined by focal junctions, forms a cellular framework throughout each bundle. Because of the unique features of the fibre bundles of the bat's wing, in particular their accessibility, and the parallel alignment of the collagen fibrils and elastic fibres in each easily isolatable fibre bundle, they should prove a most valuable model for connective tissue studies, particularly for the study of collagen-elastin interactions. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:649500

  17. Intermediate hosts of Schistosoma

    PubMed Central

    Mandahl-Barth, G.

    1957-01-01

    This study is an attempt to classify all described species of African Bulinus. It is based upon the author's examination of a great number of specimens collected from many parts of Africa. The variations attributable to age, environment and genetic factors which may be noted in the taxonomic characters are discussed, and some new species and subspecies are established. For each recognized species and subspecies the author states the distinguishing characters, indicates the geographical distribution, and gives a list of synonyms. ImagesFig. 1Fig. 2Fig. 2(concluded)Fig. 3Fig. 4Fig. 5Fig. 5(continued)Fig. 5(concluded)Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 16(concluded)Fig. 17Fig. 18Fig. 19Fig. 20Fig. 21Fig. 22Fig. 22(concluded)Fig. 23 PMID:13479773

  18. Synaptic endfeet in the 'acoustic nerve nucleus' of the rat. An electron microscopic study.

    PubMed Central

    Alvarez-Bolado, G; Merchán, J

    1988-01-01

    The medial portion of the cochlear nerve of the rat contains astrocytes, oligodendrocytes and neurons. These neurons form what has been called the 'acoustic nerve nucleus'. This nucleus has been studied here at the electron microscopic level. Its neurons are large and round, showing an eccentric nucleus, fibrillary bodies and rough endoplasmic reticulum which is not arranged in stacks. The somata and dendrites receive synaptic endfeet which can be classified into three groups according to vesicle size and shape. In general, the ultrastructural characteristics of these cells are similar to those of bushy cells as reported by other authors. The 'acoustic nerve nucleus' can be considered to be the most peripheral part of the anterior ventral cochlear nucleus. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:3248967

  19. Ultrastructure of Ebola virus particles in human liver.

    PubMed Central

    Ellis, D S; Simpson, I H; Francis, D P; Knobloch, J; Bowen, E T; Lolik, P; Deng, I M

    1978-01-01

    Electron microscopy of tissues from two necropsies carried out in the Sudan on patients with Ebola virus infection identified virus particles in lung and spleen, but the main concentrations of Ebola particles were seen in liver sections. Viral precursor proteins and cores were found in functional liver cells, often aligned in membrane-bound aggregations. Complete virions, usually found only extracellularly, were mainly seen as long tubular forms, some without cores. Many tubular forms had 'enlarged heads' or 'spores' and some branched and torus forms were identified. The size and structure of the Ebola virus forms appear to be virtually indistinguishable from those of Marburg virus. Images Figs 6, 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 PMID:641193

  20. The susceptibility of rodents to schistosome infection, with special reference to Schistosoma haematobium

    PubMed Central

    Gear, J. H. S.; Davis, D. H. S.; Pitchford, R. J.

    1966-01-01

    In this investigation the susceptibility of several species of rodents—Praomys (Mastomys) natalensis, Saccostomus campestris, Arvicanthus niloticus, Aethomys chrysophilus, Tatera brantsi and the white mouse (SAIMR 200 strain)—to Schistosoma haematobium was determined and the pathology studied. From the results it is clear that these rodents are susceptible to infection with Schistosoma haematobium. For various reasons, notably adaptability to laboratory conditions, the most suitable as laboratory animals for the study of bilharziasis are Saccostomus campestris, Arvicanthus niloticus and Praomys (Mastomys) natalensis. These three species breed readily in the laboratory and show a high susceptibility to S. haematobium, with characteristic lesions involving several organs, including the lungs, liver, spleen, pancreas and intestine. ImagesFIG. 1FIG. 2FIG. 3FIG. 4FIG. 5FIG. 6FIG. 7FIG. 8FIG. 9FIG. 10FIG. 16FIG. 17FIG. 18FIG. 19FIG. 20FIG. 11FIG. 12FIG. 13FIG. 14FIG. 15 PMID:5297005

  1. Cell death during the development of the truncus and conus of the chick embryo heart.

    PubMed Central

    Hurle, J M; Ojeda, J L

    1979-01-01

    The presence of cell death in the walls of the truncus and conus of the developing chick heart was investigated by a variety of light and electron microscopic techniques. Necrotic areas were observed in the myocardial layer of the truncus and conus and within the mesenchymal cells of the truncoconal ridges and aortopulmonary septum. These necrotic zones appeared first at Stage 25-26 and reached their maximum extent at Stages 29-32 undergoing later progressive disappearance. The morphological changes of the degenerating cells detectable under both transmission and scanning electron microscopy are also reported. The possible role of cell death in the morphogenesis of the truncus and conus is discussed. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:500497

  2. The innervation of the adrenal gland. IV. Innervation of the rat adrenal medulla from birth to old age. A descriptive and quantitative morphometric and biochemical study of the innervation of chromaffin cells and adrenal medullary neurons in Wistar rats.

    PubMed Central

    Tomlinson, A; Coupland, R E

    1990-01-01

    The innervation of the adrenal medulla has been investigated in normal Wistar rats from birth to old age and ultrastructural findings compared with biochemical markers of the cholinergic innervation of the adrenal gland and catecholamine storage. Morphological evidence of the immaturity of the innervation during the first postnatal week is provided and using quantitative morphometry the innervation of chromaffin cells is shown to reach a mean total of 5.4 synapses per chromaffin cell during the period 26 days to 12 weeks of age. The variation in contents of synaptic profiles is discussed in the light of recent work that demonstrates a major sensory as well as visceral efferent innervation of the gland. Adrenal medullary neurons usually occur in closely packed groups, intimately associated with Schwann cells. Axodendritic and axosomatic synapses on these neurons are described and the likely origin of axonal processes innervating the neurons discussed. In old age the density of innervation remains the same as in young adult animals even though the medulla shows evidence of hyperplasia and hypertrophy of individual chromaffin cells. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 PMID:2384334

  3. Radiographic features of bone in several strains of laboratory mice and of their tumours induced by bone-seeking radionuclides.

    PubMed Central

    Loutit, J F; Corp, M J; Ardran, G M

    1976-01-01

    The natural radiographic appearance of the various bones of the skeleton are described for several strains of laboratory mice. The Harwell substrains of CBA, A and 101 are generally similar and become osteoporotic on ageing. Harwell C57BL have similar, but more delicately chiseled, bones. Harwell C3H mice have bones with stouter cortices and may show osteosclerosis on ageing. CF1 females (donated by Dr M. Finkel) showed osteosclerosis and osteophytic outgrowths when aged. NMRI mice (donated by Dr A. Luz) appeared larger than the pure-strain Harwell mice. In general, mouse bones are simple tubular structures with an ivory cortex and a marrow cavity. Cancellous trabecular bone is scanty, even in vertebrae, flat bones and the metaphyses of long bones. Bone-seeking radionuclides administered to mice lead to skeletal tumours: (a) osteosarcomata, which are commonly radio-opaque to a variable degree owing to calcified tumour bone, but which may be osteolytic, (b) primitive mesenchymal (angio-) sarcomata which are non-osteogenic and osteolytic, (c) fibrosarcomata--which also are osteolytic--and to local or general lymphomata from irradiation of parental cells in bone marrow, but no special radiological features have been found associated with these last-named tumours. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:1069700

  4. Experimental Tetracycline Labeling in Avian Osteopetrosis

    PubMed Central

    Sanger, V. L.; Holt, J. A.

    1965-01-01

    Osteopetrosis was experimentally produced and lesion development in time was studied by fluorescent illumination of tetracycline labels in the bone. Bones from birds 84, 115, 186 and 354 days of age were examined by ground section under ultraviolet light. Periosteal activity of the tibia and femur was present in normal bones at 84 days of age but had stopped at 115 days. Focal periosteal activity of osteopetrotic lesions was present at 186 days but not at 354 days of age. Slight endosteal activity of osteopetrotic bones was present at 354 days of age. Osteopetrotic bone formed at a rate of 1.26 mm. per week or 6 times faster than normal bone in some of these lesions. Tetracycline diffused throughout the 354-day-old osteopetrotic lesion but not normal compact bone indicating that the osteopetrotic bone is porous and spongy. ImagesFig. 1.Fig. 2. Fig. 3.Fig. 4.Fig. 5.Fig. 6.Fig. 7.Fig. 8.Fig. 9.Fig. 10.Fig. 11.Fig. 12.Fig. 13. PMID:4221759

  5. The fine structure of the proximal growth plate of the avian tibia: vascular supply.

    PubMed Central

    Howlett, C R; Dickson, M; Sheridan, A K

    1984-01-01

    The vascular supply to the proximal tibial growth plate of the 7 weeks old chicken is described using various vascular markers. In addition the ultrastructure of metaphyseal and epiphyseal vessels as well as their supporting tissue is reported. The metaphyseal arterioles terminate in large calibre vessels which have occasional endothelial gaps and no basement membrane or supporting cells, and therefore could be classified as venous sinusoids. In contrast the epiphyseal arteriole terminates in a capillary-venule plexus lined by an attenuated and fenestrated but continuous endothelium. This paper definitively establishes that communication of epiphyseal and metaphyseal vessels across the avian growth plate does not occur. The eosinophilic streaks which often join these two vascular supplies have been described ultrastructurally and would appear to be remnants of the 'retreating' epiphyseal vessels. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 PMID:6469851

  6. Meckel's cartilage in Xenopus laevis during metamorphosis: a light and electron microscope study.

    PubMed Central

    Thomson, D A

    1986-01-01

    Meckel's cartilage, in Xenopus laevis prior to metamorphosis, is a tissue exhibiting very large lacunae, separated by thin rims of matrix, presenting a net-like appearance, similar to that of cartilage in invertebrates. The cells on the periphery of the tissue are rather more flattened, and more closely packed. On the lateral aspects of the cartilage distinct columns of apparently dividing cells are evident. During metamorphic climax, the amount of matrix separating the lacunae increases, with an associated decrease in lacunar size, and some of the deeper cells develop cilia, which are not seen either before or after climax. By the end of metamorphic climax there is a considerable increase in the amount of matrix present in the tissue, while many cells at all depths in the cartilage show the presence of lysosome-like structures, possibly associated with the changing shape of the cartilage. Intramembranous ossification is proceeding around Meckel's cartilage, but there is no evidence of endochondral ossification up to the end of metamorphosis. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 PMID:3693112

  7. Tumours of bones and joints

    PubMed Central

    Misdorp, W.; Van Der Heul, R. O.

    1976-01-01

    Tumours of bones and joints are not infrequent in dogs but are rare in other domestic animals. In the dog, most bone tumours are malignant; osteosarcomas are by far the most frequently encountered tumours, especially in giant breeds and boxers. The following main categories of bone tumour are described: bone-forming, cartilage-forming, giant cell, marrow, vascular, miscellaneous, metastatic, unclassified, and tumour-like lesions. The tumours of joints and related structures are classified as synovial sarcomas, fibroxanthomas, and malignant giant cell tumour of soft tissues. ImagesFig. 21Fig. 22Fig. 23Fig. 24Fig. 17Fig. 18Fig. 19Fig. 20Fig. 29Fig. 30Fig. 31Fig. 32Fig. 33Fig. 34Fig. 35Fig. 36Fig. 25Fig. 26Fig. 27Fig. 28Fig. 1Fig. 2Fig. 3Fig. 4Fig. 37Fig. 38Fig. 39Fig. 40Fig. 5Fig. 6Fig. 7Fig. 8Fig. 13Fig. 14Fig. 15Fig. 16Fig. 9Fig. 10Fig. 11Fig. 12 PMID:1086157

  8. Tumours of the upper alimentary tract

    PubMed Central

    Head, K. W.

    1976-01-01

    Tumours of the oropharynx of domestic animals are common in most parts of the world, but squamous cell carcinoma of the upper alimentary tract shows differences in prevalence in different geographical areas and occurs at different sites in the various species. Oral tumours of the melanogenic system are more common in dogs than in man. The following main histological categories, which broadly correspond to those used in the classification of tumours of man, are described: papilloma; squamous cell carcinoma; salivary gland tumours; malignant melanoma; tumours of soft (mesenchymal) tissues; tumours of the facial bones; tumours of haematopoietic and related tissues; and odontogenic tumours and jaw cysts. Papilloma, squamous cell carcinoma, malignant melanoma, fibroma, and fibrosarcoma account for about 80% of the tumours that occur in the upper alimentary tract of domestic animals. ImagesFig. 6Fig. 7Fig. 8Fig. 9Fig. 34Fig. 35Fig. 36Fig. 37Fig. 2Fig. 3Fig. 4Fig. 5Fig. 22Fig. 23Fig. 24Fig. 25Fig. 26Fig. 27Fig. 28Fig. 29Fig. 14Fig. 15Fig. 16Fig. 17Fig. 30Fig. 31Fig. 32Fig. 33Fig. 18Fig. 19Fig. 20Fig. 21Fig. 10Fig. 11Fig. 12Fig. 13Fig. 1 PMID:1086147

  9. The ventricular system of the pigeon brain: a scanning electron microscope study.

    PubMed Central

    Mestres, P; Rascher, K

    1994-01-01

    The fine structural features and regional differences of the ependyma in adult pigeons have been investigated by scanning electron microscopy. Pigeons of either sex were fixed with buffered glutaraldehyde (3%) and formaldehyde (0.5%) by intravascular perfusion. The brain was dissected using section planes adequate to expose each part of the ventricular system. The specimens were then dehydrated, critical point dried and sputtered with gold. Depending upon the distribution of cilia, microvilli and single cilia, different areas were recognised in the 4 ventricles. The topographic locations of these areas were determined using the atlas of Karten & Hodos (1967). The medial surfaces of the 1st and 2nd lateral ventricles are more densely ciliated than the lateral surfaces. In the floor of the 4th ventricle the medial part is less ciliated than the lateral parts. The circumventricular organs (subseptal organ, organum vasculosum of the lamina terminalis, infundibulum, choroid plexus, subcommissural organ, area postrema) show very characteristic surfaces and are surrounded by a transitional zone with the nonspecialized ependyma. In contrast, in the paraventricular organ the transition to the nonspecialized ependyma is rather abrupt. The ependyma covering the trochlear nucleus appears densely ciliated, differing from that of the classic circumventricular organs. Finally, the existence of openings in the caudal medullary velum, which represent direct communications between the ventricles and the subarachnoid space, was demonstrated. Images Fig. 2 Fig. 3 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:8157492

  10. Histopathology and Distribution of Viral Antigens in Hamsters Infected with Virulent and Benign Venezuelan Encephalitis Viruses

    PubMed Central

    Jahrling, P. B.; Scherer, W. F.

    1973-01-01

    Lethalities and virulences of Venezuelan encephalitis (VE) viruses for hamsters were found to correlate with severity of histopathologic lesions in hematopoietic and brain tissues. Highly virulent strains (subtype I) destroyed marrow and lymphoid cells rapidly and produced intestinal wall damage; focal brain hemorrhages and destruction of Purkinje cells also occurred within the 4 to 5 days between subcutaneous inoculation and death. Like subtype I virus, a slightly less virulent strain (subtype II) also caused necrosis of bone marrow and brain lesions, but only minimal lymphoid cell damage occurred. The less virulent subtype III VE virus, which killed hamsters between 4 and 14 days after inoculation, usually caused no lesions in hematopoietic tissues, and deaths were related chiefly to hemorrhagic brain lesions and necrosis of Purkinje cells. Two VE viruses, benign for hamsters (the TC-83 attenuated vaccine strain and subtype IV), usually caused no necrosis of hematopoietic or brain tissues; focal extravasations of blood and swollen glial cells were found in brains of the rare hamsters that died. The degrees of necrosis seen in tissues stained with hematoxylin and eosin correlated with the quantities of viral antigens detected by fluorescent antibody, except in pancreas and small intestinal smooth muscle and glands, where antigens of subtype I virus were present without morphologic damage. ImagesFig 5-6Fig 7-8Fig 9Fig 10Fig 11Fig 12Fig 13Fig 14Fig 15Fig 16Fig 1-4 PMID:4578265

  11. Variability of dermal elastin visualized ultrastructurally with iron hematoxylin.

    PubMed Central

    Spicer, S. S.; Brissie, R. M.; Thompson, N. T.

    1975-01-01

    The Verhoeff iron hematoxylin-lead citrate (VIH-LC) method demonstrated vertical elastic fibers that were often composed only of microfibrillar component extending into the epidermal basement membrane in human skin. These fibers connected with a network of trabeculae composed of microfibrils and elastin fibrils in varying proportions. The large elastic fibers in the deep two thirds of the dermis consited mainly of compact bundles of small elstin fibrils in infants and of solid elastin cores with a fimbriated periphery in adults; Dermis of a 6-month-old fetus contained very few small elastic fibrils except around blood vessels. Skin of an elderly subject revealed exteme proliferation of unusual reticulated elastic fibers in various areas and disclosed abnormal nodules of elastin or collagen fibrils in finely particulate matter. Small elastin fibrils, abundant microfibrils, and intermixed individual collagen fibrils comprised an adventitial collar between sweat glands and fibroblasts. Elastin fibrils were absent from this collar in the fetus and increased with the subject's age. A permanganate-high iron diamine sequence appeared to impart density to the microfibrillar component of elastic fibers. Images Figs 6-7 Fig 8 Fig 9 Fig 10 Fig 11 Fig 12 Fig 13 Fig 14 Fig 15 Fig 16 Fig 17 Fig 18 Fig 19 Fig 20 Fig 21 Fig 22 Fig 23 Fig 24 Fig 25 Fig 26 Fig 27 Fig 1 Fig 2 Figs 3-5 Fig 28 Fig 29 Fig 30 Fig 31 Fig 32 Fig 33 PMID:49149

  12. Ultrastructural and biochemical observations on proteoglycans and collagen in the mutable connective tissue of the feather star Antedon bifida (Echinodermata, Crinoidea).

    PubMed Central

    Erlinger, R; Welsch, U; Scott, J E

    1993-01-01

    Mutable connective tissue, unique to echinoderms, changes its mechanical behaviour within seconds of nervous stimulation. The molecular mechanism of this phenomenon is not understood. In this study proteoglycans and collagen of the brachial ligaments connecting neighbouring ossicles of the arms of the feather star Antedon bifida have been investigated by biochemistry, light and electron microscopy and the critical electrolyte concentration (CEC) technique using the dye Cupromeronic Blue (CB). The ligaments consist mainly of parallel cross-striated collagen fibrils, 82 +/- 12 nm in diameter, with a characteristic banding pattern and a D-period of 52.8 +/- 3.2 nm. Some fibrils were disaggregated into bundles of 10-11 nm protofibrils, lying between the normal fibrils. Proteoglycans occur at the surface of the fibrils with 2 binding sites (each with a different CEC) per D-period and also inside the fibrils. The surface proteoglycans are more highly sulphated (i.e. their CECs are > 1.3 M) than the intrafibrillar proteoglycans (CEC < 0.9 M). The glycosaminoglycans consist of a highly sulphated chondroitin sulphate, possibly with fucose residues. The results are consistent with the theory that disaggregation of the fibrils into protofibrils and reaggregation might be a mechanism of mutability, without excluding the possibility that fibrils may slide alongside each other during movements in the viscous phase of the ligament. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:8270464

  13. Chronic Actinic Keratopathy—A Condition Associated with Conjunctival Elastosis (Pingueculae) and Typified by Characteristic Extracellular Concretions

    PubMed Central

    Klintworth, Gordon K.

    1972-01-01

    Morphologic observations on a peculiar type of corneal reaction with a predisposition for the superficial stroma of the interpalpebral portion of the cornea are reviewed. Histochemical evidence is provided which indicates that the corneal concretions, though not homogenous, are proteinaceous in nature and contain amino acids not normally detectable in the cornea. The corneal concretions were associated with conjunctival elastosis (pingueculae) in all 22 instances in which the eyes were sectioned in the horizontal plane. Identical concretions were identified within these associated pingueculae, as well as in a large percentage of other pingueculae and cutaneous lesions with actinic elastosis. The findings suggest that the abnormal material arises in the pericorneal conjunctival connective tissue from whence it diffuses into, and deposits in, the superficial corneal stroma. The data also raise the possibility that the concretions may be derived, at least in part, from altered elastic tissue. Morphologic and epidemiologic observations on the condition taken together strongly suggest that this unique reaction is a sequel to the cumulative effect of chronic actinic irradiation. Further observations on this keratopathy are needed to establish whether this unique response can be provoked by other noxious stimuli. ImagesFig 5Fig 6Fig 7Fig 8Fig 9Fig 10Fig 11Fig 12Fig 1Fig 2Fig 3Fig 4Fig 13Fig 14Fig 15 PMID:5021106

  14. Hematuria and rectal bleeding in the child with Klippel and Trenaunay syndrome.

    PubMed Central

    Servelle, M; Bastin, R; Loygue, J; Montagnani, A; Bacour, F; Soulie, J; Andrieux, J B

    1976-01-01

    We have operated upon 588 patients with Klippel and Trenaunay syndrome. The underlying factor is a congenital malformation of the deep veins: agenesis, atresia or compression by fibrovascular bands of the popliteal, femoral or iliac veins. Of these 588 patients, 6 children between 15 months and 4 years of age had severe rectal bleeding and hematuria. One of these children died from massive bleeding of the rectum with septicemia. Another boy was saved by rectal resection and the last one by subtotal cystectomy. The important venogram shows an absence of the anterior venous pathway (superficial femoral vein) compensated by the abnormal development of 2 venous groups, the vein of the sciatic nerve and large veins along the external aspect of the inferior limb. These 2 venous groups penetrate into the pelvis by the sciatic and gluteal notches and terminate in the internal iliac vein which becomes enormous and has a very high flow. This overflow hinders drainage of the venous collateral from the rectum, the bladder and the vagina. The retro adductor vein, prolongated by the deep femoral vein, represents an anastomosis between the sciatic nerve vein and the common femoral vein. The surgeon must try to widen this pathway. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. Fig. 13. Fig. 14. PMID:178278

  15. Magnetic resonance imaging: present and future applications

    PubMed Central

    Johnston, Donald L.; Liu, Peter; Wismer, Gary L.; Rosen, Bruce R.; Stark, David D.; New, Paul F.J.; Okada, Robert D.; Brady, Thomas J.

    1985-01-01

    Magnetic resonance (MR) imaging has created considerable excitement in the medical community, largely because of its great potential to diagnose and characterize many different disease processes. However, it is becoming increasingly evident that, because MR imaging is similar to computed tomography (CT) scanning in identifying structural disorders and because it is more costly and difficult to use, this highly useful technique must be judged against CT before it can become an accepted investigative tool. At present MR imaging has demonstrated diagnostic superiority over CT in a limited number of important, mostly neurologic, disorders and is complementary to CT in the diagnosis of certain other disorders. For most of the remaining organ systems its usefulness is not clear, but the lack of ionizing radiation and MR's ability to produce images in any tomographic plane may eventually prove to be advantageous. The potential of MR imaging to display in-vivo spectra, multinuclear images and blood-flow data makes it an exciting investigative technique. At present, however, MR imaging units should be installed only in medical centres equipped with the clinical and basic research facilities that are essential to evaluate the ultimate role of this technique in the care of patients. ImagesFig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14 PMID:3884120

  16. Electron Microscopy of the Cell

    PubMed Central

    Leeson, T. S.

    1965-01-01

    The use of the electron microscope has added much to our knowledge of the cell. The fine structure of the component parts of the nucleus and the cytoplasm is described, and their functions are indicated. The nature and structural modifications of the plasma membrane are illustrated with particular reference to function. To illustrate the interrelationships of the nucleus and cytoplasm, the theory of protein secretion is discussed, the secretion of a particular protein or polypeptide being determined by a particular nucleotide sequence in the desoxyribonucleic acid of a chromosome, that is, by a gene. This information is transferred from nucleus to cytoplasm. It is in the cytoplasm that the majority of the work is performed while the nucleus directs the work of the cell. ImagesFig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17Fig. 18Fig. 19Fig. 20Fig. 21Fig. 22Fig. 23Fig. 24Fig. 25Fig. 26 PMID:5829410

  17. Amyloidogenesis in Healing Wound

    PubMed Central

    Hashimoto, Ken; Brownstein, Martin H.

    1972-01-01

    Clinically and histologically typical skin lesions of macular and lichenoid amyloidoses were biopsied. Rebiopsies were performed after 2 to 16 weeks, and the sequence of amyloid reproduction in granulation tissue was followed. Initially, medium electron-dense proteinaceous substance with fine filaments was produced within or in close relation to the rough-surfaced endoplasmic reticulum of fibroblasts and subsequently discharged. Typical amyloid filaments emerged within and in the vicinity of this substance. A significant number of collagen fibrils were admixed in the centers of some amyloid islands. Predominantly amorphous amyloid substance was seen in contact with the basal laminae. No plasma cells were observed in foci of amyloid. Nonepithelialized wounds did not contain amyloid. It was suggested that, in the primary skin amyloidoses, abnormal dermal fibroblasts produce amyloid precursors under the influence of the epidermis. ImagesFig 9Fig 10Fig 4Fig 5Fig 11Fig 6Fig 7Fig 12Fig 1Fig 2Fig 8Fig 3 PMID:5049430

  18. Light microscopic identification of immature glial cells in semithin sections of the developing mouse corpus callosum.

    PubMed Central

    Sturrock, R R

    1976-01-01

    Four distinct types of glial cell were recognized in the corpus callosum of young postnatal mice: the early glioblast; the small glioblast; the large glioblast; and the young astrocyte. As well as these, mature microglia could be recognized from birth. In semithin, toluidine blue stained sections early glioblasts had large, fair to moderately stained nuclei, and a thin rim of pale cytoplasm; small glioblasts had small, dark nuclei and a rim of darkly stained cytoplasm; large glioblasts had moderately unevenly stained nuclei and a thin rim of moderately stained cytoplasm; and young astrocytes had fairly small nuclei, moderately stained cytoplasm, and one or more processes, which could usually be seen extending for 5 mum or more from the perikaryon. Differential glial counts using the criteria described above, in conjunction with electron microscopic analysis, suggested that early glioblasts gave rise to small glioblasts and large glioblasts; that small glioblasts gave rise directly to astrocytes, large glioblasts, oligodendrocytes and possibly microglia; that large glioblasts formed oligodendrocytes only, and might be immature light oligodendrocytes; and that part of the microglial population might arise from vascular pericytes. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:795801

  19. The embryological development of primary visual centres in the turtle Emys orbicularis.

    PubMed Central

    Hergueta, S; Lemire, M; Pieau, C; Ward, R; Repérant, J

    1993-01-01

    The development of the primary visual centres was studied in a series of embryos of the turtle, Emys orbicularis, incubated at 25 degrees C. The differentiation of both visual and nonvisual diencephalic and mesencephalic structures takes place entirely within the 2nd quarter of the period of incubation; this finding appears to be consistent with previous descriptions of the embryology of 2 other chelonian species, Lepidochelys and Chelydra. Two successive waves of migration, each dividing into internal and external sheaves, are involved in the formation of the structures of the diencephalon and mesencephalon. The primary visual centres, which comprise 2 hypothalamic, 5 thalamic and 5 pretectal zones of retinal projections, together with the 2 superficial layers of the tectum and a single tegmental projection zone, all have their origin in the external sheaf of the 1st wave of migration. The finding that the adult nucleus geniculatus lateralis dorsalis, pars ventralis arises from one of the migrations of the dorsal thalamus is discussed in the context of the debate over the possible homologues of the mammalian geniculostriate visual pathway. Images Fig. 1 (cont.) Fig. 1 Fig. 2 (cont.) Fig. 2 Fig. 3 (cont.) Fig. 3 Fig. 4 (cont.) Fig. 4 Fig. 5 (cont.) Fig. 5 Fig. 6 (cont.) Fig. 6 Fig. 7 Fig. 8 (cont.) Fig. 8 Fig. 9 (cont.) Fig. 9 Fig. 10 (cont.) Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:8300423

  20. A fine structural study of the removal of the effectiveness of benzo-pyrone treatment of lymphoedema by the destruction of the macrophages by silica.

    PubMed Central

    Casley-Smith, J. R.; Földi-Börcsök, E.; Földi, M.

    1978-01-01

    Macroscopical, light microscopical and electronmicroscopical observations were made of the diaphragm, skin and brain of rats, some of which were treated with intraperitoneal silica for 8 days (after being given it i.v. for 2 days). The diaphragms showed a most remarkable increase in fibroblast activity and fibrosis beneath the peritoneal mesothelium (which was disintegrating). Deep to this there were many disintegrating macrophages, and much oedema and increased protein concentration. Ligation of the cervical lymphatics produced the usual changes of lymphoedema in the skin and brain. This was greatly reduced in the animals treated with a mixture of benzo-pyrones. However, in those animals also treated with silica, the benzo-pyrones had no effect on the amount of oedema or of protein. In all the animals except those treated with silica, lymphoedema was accompanied by considerable numbers of macrophages entering the affected tissues; in those treated with silica, these numbers were greatly reduced. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:207299

  1. The prelymphatic pathways of the brain as revealed by cervical lymphatic obstruction and the passage of particles.

    PubMed Central

    Casley-Smith, J. R.; Földi-Börsök, E.; Földi, M.

    1976-01-01

    Light and electron microscopy was used to examine portions of the brain, the circle of Willis, and the internal carotid arteries of normal cats and rabbits, of sham-operated ones, and of those whose cervical lymphatics had been ligated. Carbon was injected into the cerebral cortex of some lymphoedematous animals. It was found that lymphatic ligation produced oedema of the brain, and a dilatation of the prelymphatic spaces around the vessels. Carbon was traced in these from the injection site, around the minor and major vessels, in the adventitia of the internal carotid artery, entering lymphatics adjacent to it, and finally in the draining lymph nodes. The oedema and dilated spaces were not present in the control animals. This was taken to indicate that there is a continuous system of non-endothelialized spaces and potential spaces-the prelymphatics-draining the brain into the cervical lymphatics. The protein in these spaces appeared to be increased if the lymph-oedema had lasted three weeks as compared to 24 hours, indicating that one of the major roles of this system is the removal of protein. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 PMID:773400

  2. Selenium toxicity and porcine focal symmetrical poliomyelomalacia: description of a field outbreak and experimental reproduction.

    PubMed Central

    Wilson, T M; Scholz, R W; Drake, T R

    1983-01-01

    An acute afebrile paretic condition was diagnosed in 18 of 225 feeder pigs between eight to ten weeks of age. Nine pigs died acutely, seven pigs were euthanatized and two appeared to recover. Macroscopic lesions in the ventral horns of the cervical and lumbar/sacral spinal cord enlargements consisted of focal, bilateral, depressed areas. Histopathologically, the lesion consisted of endothelial proliferation, glial cell reaction and microcavitation. Similar lesions were observed in some brain stem motor nuclei. High selenium levels were detected in the pig feed and in pig tissues and blood. Two of five experimental pigs fed a commercial grower ration and supplemented with 52 ppm selenium as sodium selenite developed paresis and paralysis after a 29 day feeding trial. Histopathological lesions of focal symmetrical poliomyelomalacia confined to the cervical and lumbar/sacral spinal cord enlargements, and identical to those in the field cases, were produced. Select brain stem motor nuclei were also affected. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. Fig. 13. Fig. 14. Fig. 15. PMID:6667430

  3. The cellular changes during osteogenesis in bone and bone marrow composite autografts.

    PubMed Central

    Thorogood, P V; Gray, J C

    1975-01-01

    Osteogenesis in and around autografts has been studied in the hope of identifying the osteoblast precursor. Fresh autografts of cortical bone with its constituent bone marrow were implanted into intramuscular sites in rats. The grafts were removed at intervals over a four week period and examined by light and electron microscopy. A chronological sequence of degenerative, reparative and differentiative events was found and described. The relative contributions of the host and graft components to post-grafting osteogenesis are discussed and the problem of the origin of the osteoblast cells is examined, taking into account present views about the interrelationships between skeletal connective tissue cells and their precursors. It is concluded that, in the investigation described, the presence of host granulation tissue was necessary for osteogenesis and it is postulated that osteoblast progenitor cells can arise from this granulation tissue, their differentiation along the osteogenic line being stimulated in some way by the presence of the graft bone. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:1102503

  4. Ultrastructural features of degenerated cardiac muscle cells in patients with cardiac hypertrophy.

    PubMed Central

    Maron, B. J.; Ferrans, V. J.; Roberts, W. C.

    1975-01-01

    Degenerated cardiac muscle cells were present in hypertrophied ventricular muscle obtained at operation from 12 (38%) of 32 patients with asymmetric septal hypertrophy (hypertrophic cardiomyopathy) or aortic valvular disease. Degenerated cells demonstrated a wide variety of ultrastructural alterations. Mildly altered cells were normal-sized or hypertrophied and showed focal changes, including preferential loss of thick (myosin) filaments, streaming and clumping of Z band material, and proliferation of the tubules of sarcoplasmic reticulum. Moderately and severely degenerated cells were normal-sized or atrophic and showed additional changes, including extensive myofibrillar lysis and loss of T tubules. The appearance of the most severely degenerated cells usually reflected the cytoplasmic organelle (sarcoplasmic reticulum, glycogen, or mitochondria) which underwent proliferation and filled the myofibril-free areas of these cells. Moderately and severely degenerated cells were present in areas of fibrosis, had thickened basement membranes, and had lost their intercellular connections. These observations suggest that degenerated cardiac muscle cells have poor contractile function and may be responsible for impaired cardiac performance in some patients with chronic ventricular hypertrophy. Images Fig 1 Fig 2 Fig 3 Figs 4-6 Figs 7-8 Fig 9 Fig 10 Fig 11 Figs 12-15 Fig 16 Fig 17 Figs 18-21 Figs 22-23 Fig 24 Fig 25 Fig 26 Fig 27 Figs 28-29 Fig 30 Figs 31-32 Fig 33 PMID:124533

  5. An analysis of implantation in Indian hipposiderid bats.

    PubMed Central

    Bhiwgade, D A

    1979-01-01

    The meagre information on the early developmental stages and the evolutionary and taxonomic position of hipposiderid bats has stimulated the present study. The cranial segment of the uterus forms a balloon-like enlargement at the time of implantation, and the antimesometrial part of its huminal slit expands into a spacious implantation chamber. Implantation is superficial and circumferential and the embryonic disc is orientated towards the side of the uterus which lies between the lateral and the antimesometrial sides. Reichert's membrane develops early, and the formation of a symplasma is described. A comparative account of implantation in the four species of hipposiderid bats of the family Hipposideridae is given, and the taxonomic position of this family is discussed on the basis of the present observations and earlier work on the embryology of Chiroptera. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 PMID:438094

  6. On the ovarian bursa of the golden hamster. II. Intercellular connections in the bursal epithelium and passage of ferritin from the cavity into lymphatics.

    PubMed Central

    Nakatani, T; Shinohara, H; Matsuda, T

    1986-01-01

    Cell abutments in the ovarian bursal epithelium of the golden hamster included tight junctions, desmosome-like junctions, gap junctions and zonulae adhaerentes. The plasma membranes of adjacent epithelial cells were often closely apposed forming a zonula adherens at the apex of the intercellular space, but these did not fuse along the entire length of the intercellular space. Gap junctions and other intercellular junctions did not allow diffusion of ferritin into the junctional areas, but failed to prevent ferritin from filling the intercellular space basal to the junction. This suggested that these junctions were not continuous around the entire circumference of the cell. In general, intercellular connections in the bursal epithelium may be labile and this lability, as well as periodic distention of the bursa, may give rise to separation of epithelial cells. Ferritin injected into the bursal cavity reached lymphatics via three routes: (1) via stomata; (2) via gaps and pores; (3) via intercellular spaces. Transcellular transport did not make a major contribution to permeation of ferritin across the bursal epithelium, and ferritin particles did not enter fenestrated blood vessels within 30 minutes after injection. The variety of routes may facilitate rapid and complete drainage of fluid and cellular components from the bursal cavity. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Figs. 12-13 Fig. 14 Fig. 15 Fig. 16 Figs. 17-18 PMID:3693080

  7. Role of cartilage canals in osteogenesis and growth of the vertebral centra.

    PubMed Central

    Chandraraj, S; Briggs, C A

    1988-01-01

    Bone formation in the vertebral centra commences within the centrum and is in this respect analogous to the secondary ossification which occurs in the epiphysis of a long bone. Bone tissue first appears at about the 85 mm C.R. stage and not in the 55 mm C.R. length embryo; at the latter stage blood vessels and calcification alone were observed. The connective tissue cells within the cartilage canal appear to assist osteogenesis by providing osteogenic cells which lay down bone in the walls of the cartilage canal, and provide cells which remove calcified cartilage found at the periphery of the canal; they assist growth by producing an appreciable number of chondrocytes that permit lateral expansion of the centra. Osteogenesis appears to occur in multiple foci within the growth plate of the older embryos and could account for the rapid rate of growth of vertebrae. Bone formation occurs in both mineralised and unmineralised matrix (as seen on the walls of the cartilage canals). The blood vessels within the growing vertebra tend to follow the zone of cartilage hypertrophy. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:3225216

  8. The fine structure of the human fetal urinary bladder. Development and maturation. A light, transmission and scanning electron microscopic study.

    PubMed Central

    Newman, J; Antonakopoulos, G N

    1989-01-01

    The urinary bladders of 27 human fetuses, aged 7 weeks to full term, were studied by light, transmission and scanning electron microscopy to establish the sequence of events in the development and maturation of the organ during fetal life. In the early specimens, 7-12 weeks old, the urinary bladder was lined by a bilayered, cuboidal and glycogen-rich epithelium. During the 13-17th weeks the epithelium thickened, a third layer developed and by light microscopy it now resembled urothelium. By 21 weeks this had evolved into a 3-4 layer thick epithelium with typical ultrastructural urothelial characteristics. Smooth muscle cells emerged from the condensed mesenchyme of the bladder wall by the 12th week of gestation, initially in the cephalic part of the organ but spreading within a week into the caudal end. Our findings indicate that the human fetal bladder undergoes a series of vital developmental changes during 13-21 weeks of gestation finally acquiring the typical urothelial lining and a well-developed muscular coat. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 PMID:2621133

  9. Ultrastructural Localization of Peroxidase Activity in Human Platelets and Megakaryocytes

    PubMed Central

    Breton-Gorius, Janine; Guichard, Josette

    1972-01-01

    Normal human platelets and megakaryocytes were examined for peroxidase activity by the diaminobenzidine (DAB) cytochemical technic. When the fixation and the incubation were adequate, a strong reaction was present in the dense tubular system of platelets suspended in plasma or spread on carbon. The black reaction product was ascribed to enzyme activity, since the reaction was completely eliminated when H2O2 or DAB were omitted, or when H2O2 was in excess. In addition, the reaction was inhibited by aminotriazole, cyanide and azide. In the human megakaryocytes, the reaction was localized in the endoplasmic reticulum including the perinuclear envelope. The Golgi complex and the clear vacuolar system were negative for the reaction. After platelet release, the reaction was always seen in the perinuclear space. The nature and function of the enzyme, as well as its possible relationships with catalase, are discussed. ImagesFig 3Fig 4Fig 5Fig 6Fig 7Fig 8Fig 9Fig 10Fig 11Fig 1Fig 2Fig 12Fig 13Fig 14Fig 15Fig 16 PMID:5009974

  10. Histopathology and immunohistochemistry of peripheral T cell lymphomas: a proposal for their classification.

    PubMed Central

    Suchi, T; Lennert, K; Tu, L Y; Kikuchi, M; Sato, E; Stansfeld, A G; Feller, A C

    1987-01-01

    Based on the results of histological and immunohistochemical observations of a large number of peripheral T cell lymphomas from China, England, Germany and Japan, histological and cytological morphology were correlated with immunophenotype, aetiological association with HTLV-1, and clinical behaviour to produce a working classification of the T cell lymphomas. This classification, based mainly on cytological criteria, divides the peripheral T cell lymphomas into tumours of low grade and high grade malignancy. Adult T cell lymphoma/leukaemia (ATLL) is caused by HTLV-1 and belongs chiefly to the high grade category. Some tumours are characterised by an admixture of other cells (epithelioid cells, follicular dendritic cells, etc) and structures (high endothelial venules, follicles), which may indicate the secretion of lymphokines by the tumour cells. Clear cells seem to be specific for T cell lymphomas and may occur in various types of peripheral T cell lymphoma. Images Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 Fig 12 Fig 13 Fig 14 Fig 15 PMID:3312308

  11. Occult Carcinoma of the Bronchus

    PubMed Central

    Pearson, F. G.; Thompson, D. W.

    1966-01-01

    The term “occult carcinoma” is applied to those patients with carcinoma of the bronchus at an in situ or early invasive stage who have carcinoma cells in their sputum but have no recognizable evidence of tumour in the chest radiograph. In eight such patients at the Toronto General Hospital, the lesion was localized and treatment instituted. Our experience with these eight patients can be compared with that of 27 patients described in two similar studies. The lesions were commonly symptomatic. Localization, although sometimes difficult, was accomplished using information obtained during bronchoscopy and bronchography. The prognosis following adequate resection appeared excellent. No patient died of carcinoma during the post-treatment follow-up period, which was continued for a minimum of 18 months. Pathological evidence indicates that bronchial carcinoma at this occult stage can be diagnosed cytologically, is rarely multifocal and, as a localized neoplasm, is amenable to curative therapy. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13 PMID:5929532

  12. Placental agenesis, embryonal hydraemia, embryolethality and acute hypervitaminosis A in rats.

    PubMed Central

    Love, A. M.; Vickers, T. H.

    1976-01-01

    Acute maternal hypervitaminosis A established on Day 9 of gestation in Sprague-Dawley-derived rats caused a dose-related increase in the resorption of implants. The median embryolethal dose was 189,000 i.u./kg. In addition to suppression of the allantois leading to placental agenesis, damaged embryos showed retarded somatic development and hydraemia, all apparent 24 h after treatment. At about Day 11 the hydraemia involved the visceral wall of the yolk sac causing death of the embryo soon after. The fluid in the vitelline vessels continued to collect until Day 13 when it absorbed following necrosis of the wall of the yolk sac. Two mechanisms are suggested for the embryonal hydraemia: either the excess fluid resulted from a permeability disorder induced by the vitamin A; or it was retained metabolic water or water specifically absorbed to inflate the allantois and, being unused for this purpose, it pooled in the blood vessels of the embryo. The yolk sac hydraemia is more likely to have followed injury to the proximal endoderm. Images Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 PMID:999789

  13. Comparative morphology, cytochemistry and innervation of chromaffin tissue in vertebrates.

    PubMed Central

    Scheuermann, D W

    1993-01-01

    Chromaffin cells were observed singly or in clusters in the heart and sympathetic cord of 2 genera of dipnoan fish, Protopterus and Lepidosiren. They were invariably found in close association with the autonomic sympathetic nervous system and at sites where chromaffin cells or their precursors are situated in mammals during ontogenetic development. X-ray microanalysis demonstrated that they contained a primary catecholamine which was identified microspectrofluorometrically as dopamine. The chromaffin cells were innervated by efferent axons with typical preganglionic sympathetic terminals which were acetylcholinesterase-positive. Although the general morphology and cytochemistry agree with those of developing intra-adrenal chromaffin cells in mammals, the morphological characteristics implicate them as active secretory gland cells. The dopamine transmitter phenotype seems to be determined by the maintenance throughout life of the separate and distant location of steroidogenic interrenal tissue from suprarenal elements. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 14 PMID:8300420

  14. Early Development of and Pathology Associated with Strongylus edentatus

    PubMed Central

    McCraw, B. M.; Slocombe, J. O. D.

    1974-01-01

    Pony foals inoculated with infective Strongylus edentatus larvae were monitored for clinical signs and selected blood changes and were examined at necropsy from two to 56 days postinfection. Larvae penetrated the intestine and reached the liver intravenously before 40 hours postinfection. Occasional thrombi and larval tracks associated with the intima of cecal and colic veins suggested aberrant paths. Larvae in the liver doubled in width between seven and 15 days postinfection and a sudden increment in circulating eosinophils occurred between 11 and 15 days. These changes were probably associated with the third molt. At 30 days fourth stage larvae were migrating in the liver; at 42 days they were present in the hepatorenal ligament. White foci were observed in the liver from two to 56 days. They contained mononuclear cells and eosinophils and later necrotic cores of eosinophils. By one month foci were overshadowed by tortuous tracks of migrating larvae. Aberrant larvae in the lungs were confined in granulomas. Massive granulomas in the wall of the cecum and colon contained small larvae which were probably inhibited by antibody associated with the third molt. Severe disruption of omental architecture and adhesions involving the intestine occurred several weeks after infection. ImagesFig. 1.Fig. 2.Fig. 3.Fig. 4.Fig. 5.Fig. 6.Fig. 7.Fig. 8.Fig. 9.Fig. 10.Fig. 11.Fig. 12.Fig. 13.Fig. 14.Fig. 15.Fig. 16.Fig. 17.Fig. 18.Fig. 19.Fig. 20.Fig. 21.Fig. 22.Fig. 23.Fig. 24. PMID:4274818

  15. Distribution of otic postganglionic and recurrent mandibular nerve fibres to the cavernous sinus plexus in monkeys.

    PubMed Central

    Ruskell, G L

    1993-01-01

    The distribution of dorsal rami of the otic ganglion was traced on one or both sides of 1 rhesus and 15 cynomolgus monkeys using interrupted serial sections. From 15 to 24 fine rami containing unmyelinated and small myelinated nerve fibres entered the cranial cavity with the mandibular nerve through the foramen ovale. Most rami contributed to a plexus positioned in the crotch of the mandibular and maxillary nerves adjacent to the trigeminal ganglion. The plexus was augmented by an accessory otic ganglion. Rami then continued dorsally on each side of or through the maxillary nerve and joined the cavernous sinus plexus. The pathway described probably gives otic parasympathetic fibres access to the cerebral arteries and may share a wider distribution in common with other nerves contributing to the cavernous sinus plexus. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Figs. 13,15 Fig. 14 PMID:8376193

  16. The XXXXY Chromosome Anomaly

    PubMed Central

    Zaleski, Witold A.; Houston, C. Stuart; Pozsonyi, J.; Ying, K. L.

    1966-01-01

    The majority of abnormal sex chromosome complexes in the male have been considered to be variants of Klinefelter's syndrome but an exception should probably be made in the case of the XXXXY individual who has distinctive phenotypic features. Clinical, radiological and cytological data on three new cases of XXXXY syndrome are presented and 30 cases from the literature are reviewed. In many cases the published clinical and radiological data were supplemented and re-evaluated. Mental retardation, usually severe, was present in all cases. Typical facies was observed in many; clinodactyly of the fifth finger was seen in nearly all. Radiological examination revealed abnormalities in the elbows and wrists in all the 19 personally evaluated cases, and other skeletal anomalies were very frequent. Cryptorchism is very common and absence of Leydig's cells may differentiate the XXXXY chromosome anomaly from polysomic variants of Klinefelter's syndrome. The relationship of this syndrome to Klinefelter's syndrome and to Down's syndrome is discussed. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15 PMID:4222822

  17. Evidence for autonomic paraneurons in sympathetic ganglia of a shrew (Tupaia glis).

    PubMed Central

    Heym, C; Williams, T H

    1979-01-01

    The morphological relationships between blood vessels and the small monoamine-storing cells have been studied in the superior sympathetic ganglia of Tupaia. Substantial clusters of these cells were found to be associated anatomically with vascular loops or glomeruli. Blood from these glomeruli enters the capillary bed that supplies principal ganglionic neurons. Thus the vascular path for catecholamine transportation is rather clearly defined in Tupaia, providing new morphological evidence for the existence of a portal system for conveying catecholamine from clusters of paraneurons to principal ganglionic neurons. On the basis of vesicle criteria, two populations of small, granule-containing cell were distinguished, and both were encountered in the same cluster. On the basis of fluorescence microscopy, the relatively small number (14.3%) of solitary SIF cells may be true interneurons because, although there has been no electron microscopic identification of efferent synapses, their processes are much longer than those of the paraneurons. Images Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:511759

  18. The formation of abdomino-perineal sacs by the fasciae of Scarpa and Colles, and their clinical significance.

    PubMed Central

    Martin, B F

    1984-01-01

    It has been shown that the membranous layer of the subcutaneous tissue, known as Scarpa's fascia, is confined to an oval area on each side of the abdominal wall. By its attachment to the deep fascia it encloses an obliquely directed oval sac which extends into the perineum by three pocket-like diverticulae. The fascial extension which forms the pockets is known as the fascia of Colles. Medially, the sac blends with the fundiform ligament, so that the sacs do not communicate with each other or with the interfascial space deep to the penile dartos. Laterally, the inferior margin creates the crease-line of the groin by its attachment to the fascia lata. Between these attachments the pockets arise from the sac. The lateral pocket continues into the superficial perineal pouch. The medial pocket, together with the intermediate, occupies the scrotum or labium majus. The intermediate pocket is associated with the spermatic cord or the round ligament of the uterus and blends with their coverings posteriorly. In the male it terminates just above the testis. The significance of the fascial arrangements in relation to urinary extravasation is discussed, and also the relationship of the intermediate pocket to an indirect inguinal hernia. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 PMID:6235202

  19. The ultrastructure of the paratympanic organ in the domestic fowl (Gallus gallus domesticus).

    PubMed Central

    Giannessi, F; Pera, L

    1986-01-01

    The structure of the paratympanic organ in chickens was investigated by means of the transmission electron microscope. The epithelium lining the lumen of the paratympanic organ consists of sensory and non-sensory components. The sensory epithelium is composed of supporting and hair cells. The hair cells are similar to the type II receptor cells present in the neuroepithelia of the vestibule and of the lateral line organs. The afferent synapses at the bases of the hair cells are also described. The non-sensory epithelium is made up of cells with a clear cytoplasm and arranged in a single layer. It also contains dark, flattened cells which sometimes possess motile cilia. Special emphasis is given to the fact that the results agree with Vitali's theory that the paratympanic organ and the lateral line organs are homologous. It is concluded, therefore, that present knowledge about this structure is not yet sufficient to allow a definitive functional interpretation. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:3693071

  20. Laboratory Design for Microbiological Safety

    PubMed Central

    Phillips, G. Briggs; Runkle, Robert S.

    1967-01-01

    Of the large amount of funds spent each year in this country on construction and remodeling of biomedical research facilities, a significant portion is directed to laboratories handling infectious microorganisms. This paper is intended for the scientific administrators, architects, and engineers concerned with the design of new microbiological facilities. It develops and explains the concept of primary and secondary barriers for the containment of microorganisms. The basic objectives of a microbiological research laboratory, (i) protection of the experimenter and staff, (ii) protection of the surrounding community, and (iii) maintenance of experimental validity, are defined. In the design of a new infectious-disease research laboratory, early identification should be made of the five functional zones of the facility and their relation to each other. The following five zones and design criteria applicable to each are discussed: clean and transition, research area, animal holding and research area, laboratory support, engineering support. The magnitude of equipment and design criteria which are necessary to integrate these five zones into an efficient and safe facility are delineated. Images Fig. 1 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 PMID:4961771

  1. Intrapulmonary distribution of inhaled chrysotile and crocidolite asbestos: ultrastructural features.

    PubMed Central

    Oghiso, Y.; Kagan, E.; Brody, A. R.

    1984-01-01

    Although all commercial types of asbestos can cause pulmonary fibrosis, little is known about ultrastructural differences in the evolution of pulmonary lesions induced by amphiboles and serpentines. The present study was designed to compare the histological and ultrastructural effects produced by chronic inhalation of either crocidolite (amphibole) or chrysotile (serpentine) asbestos in the rat. Animals, exposed by intermittent inhalation for 3 months, were killed after 2 to 16 months. When inhaled, both types of asbestos caused thickened alveolar duct bifurcations associated with macrophage aggregates. Crocidolite inhalation also produced subpleural collections of alveolar macrophages and lymphocytes. Electron microscopy revealed some similarities, but also distinct differences, in the pulmonary distribution of inhaled chrysotile and crocidolite. Whereas both asbestos varieties were identified within the pulmonary interstitium, only crocidolite was detected inside alveolar macrophages. Chrysotile fibres were seen infrequently within the vascular compartment. Microcalcifications were noted after chrysotile inhalation, but were never observed following crocidolite exposure. Both asbestos types induced slight pulmonary fibrosis. These findings indicate that crocidolite and chrysotile produce different pathogenetic features, although both are fibrogenic. Images Fig. 4 Fig. 7 Fig. 8 Fig. 5 Fig. 1 Fig. 2 Fig. 3 Fig. 6 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:6087872

  2. Ultrastructural Changes in Chick Cerebellum Induced by Polyinosinic Polycytidylic Acid

    PubMed Central

    Yu, Mang C.; Young, Paul A.; Yu, Wan-Hua Amy

    1971-01-01

    The ultrastructural changes in cerebellar encephalopathy induced by intravenous injection of poly I:C in young chickens were studied. The neuroglia and the small blood vessels showed the most severe injury. In the astroglia, initial alterations consisted of a mild cytoplasmic swelling whereas terminally, evagination of the outer nuclear membrane, formation of large vacuoles, and mitochondrial swelling occurred. In the cortex, oligodendroglial alterations consisted of dilatation of the nuclear membranes and of the endoplasmic reticulum, whereas in the white matter, the interfascicular oligodendroglia exhibited clumping and coagulation of the chromatin material. Some small blood vessels appeared normal, while others showed massive erosion of the endothelium resulting in aneurysm-like ballooning of the vascular wall. The granule cells displayed marked edema. The myelin of nerve fibers showed an accumulation of fluid initially, with splitting occurring in the terminal stages. These studies indicated a severe cytotoxic effect of poly I:C on the cerebella of young chickens. ImagesFig 16Fig 17Fig 13Fig 14Fig 15Fig 5Fig 6Fig 7Fig 8Fig 9Fig 10Fig 11Fig 12Fig 1Fig 2Fig 3Fig 4 PMID:5142269

  3. Morphometric study on the development of magnocellular neurons of the supraoptic nucleus utilising immunohistochemical methods.

    PubMed Central

    Lazcano, M A; Bentura, M L; Toledano, A

    1990-01-01

    Vasopressin (VP)- and oxytocin (OXY)-producing neurons, components of the rat supraoptic nucleus, have been located with immunohistochemical methods, with the purpose of studying their morphofunctional characteristics during different phases of life (embryonic, juvenile, adult and senile). To carry out this study, an IBAS I (Kontron) computerised image analyser has been utilised. The hormone VP is first detected in the neuronal cytoplasm of 21 days old rat embryos and the hormone OXY appears in the neuronal cytoplasm later, in the newborn phase. The neuronal area with a positive reaction for the two neurohormones has been evaluated and it has been found that the quantity of reaction substance is proportional to the age. In the adult period, VP neurons possess a reaction area (198 microns 2) greater than that of OXY neurons (153 microns 2). In the SON, there are two neuronal shapes, fusiform and round; these shapes coexist in both hormonal types of neurons. Until Day 15 of postnatal development, the SON neurons are intermixed in the interior of the nucleus but in this period a neuronal redistribution is initiated. In the adult phase, OXY neurons are situated preferentially in the anterior, posterior and dorsal parts and VP neurons in the ventral and posterior parts, with both neurons being present in the intermediate part of the SON. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Figs. 12-14 Fig. 15 Fig. 16 PMID:2182586

  4. A morphological and morphometric study of the prosimian lung: the lesser bushbaby Galago senegalensis.

    PubMed Central

    Maina, J N

    1990-01-01

    The lung of the lesser bushbaby (Galago senegalensis) has been investigated morphologically and morphometrically using the transmission and scanning electron microscopes. Grossly and microscopically, the bushbaby lung was found to be essentially similar to that of the other primates and the mammals in general. Subtle morphometric differences were, however, observed, with the bushbaby lung being generally structurally less sophisticated than that of the other primates on which comparable data are available, except for man. The weight-specific surface area of the blood-gas (tissue) barrier in G. senegalensis was 25 cm2 g-1. The thickness of the blood-gas barrier was 0.355 micron and the weight specific total anatomical pulmonary diffusing capacity 0.045 mlO2 sec-1 mbar1 kg-1. The morphological similarity of the galago lung to that of man gives sufficient grounds to justify its possible use in human pulmonary studies but caution has been called for in the general utilisation of primate tissues without first establishing their morphological characteristics, just because the primates are taken to be evolutionally close to man. The dearth of morphological studies on the various organ systems of the prosimians is pointed out. Images Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 5 Fig. 6 Fig. 1 Fig. 2 Fig. 3 Fig. 4 PMID:2272898

  5. Blood Vessel Tumorigenesis by 1,2-Dimethylhydrazine Dihydrochloride (Symmetrical)

    PubMed Central

    Toth, Bela; Wilson, Richard B.

    1971-01-01

    Administration of 0.001% 1,2-dimethylhydrazine dihydrochloride, symmetrical, in the drinking water of 7-week-old randomly bred Swiss mice for the remainder of their lifetime induced blood vessel tumors and enhanced the incidence of lung neoplasms. Ninety-eight percent of the females and 92% of the males developed vascular lesions, whereas among the controls the incidence was 3% in the females and 1% in the males. In addition, the incidence of lung tumors rose from 12 to 44% in the females and from 10 to 24% in the males, as compared with the controls. The occurrence of the vascular tumors in order of decreasing frequency was as follows: muscle, pararenal, fat, liver, parametrial, paraepididymal tissues, etc. Gross, light and electron microscopic examinations of vascular lesions revealed the characteristic appearance of angiosarcomas. The type and extent of macroscopic and histologic involvements of the various tissues by the tumors are presented. The ultrastructural descriptions of hemorrhagic areas, vascular spaces, neoplastic endothelial cells, their cytoplasms and organelles are illustrated in detail. In conclusion, whereas hydrazine enhanced the development of lung tumors, when the dimethyl group was attached to it at symmetrical positions, it evoked vascular tumors. Thus, the present study provides evidence for the possible relationship between chemical structure and tumor induction at specific organ sites. ImagesFig 10Fig 9Fig 11Fig 12Fig 1Fig 2Fig 3Fig 4Fig 5Fig 6Fig 7Fig 8 PMID:5133519

  6. Histopathology of N-methyl-N-nitrosourea-induced mesenchymal tumours of the rat urinary bladder.

    PubMed Central

    Kunze, E.; Ruschitzka, F.; Schwalbe, K.

    1990-01-01

    The present study reports the induction, histopathology, immunocytochemistry, growth pattern and proliferative behaviour of mesenchymal tumours of the urinary bladder of rats induced by a single intravesical dose (5 mg/kg/body weight) of N-methyl-N-nitrosourea (MNU). In 14 of 283 female Wistar rats (incidence: 4.9%). 16 non-epithelial tumours had developed after an experimental period of 14 months. The most common histological type induced was of fibrohistiocytic origin (eight benign-appearing and three malignant fibrous histiocytomas). Furthermore, two pure histiocytomas (one benign and one malignant) and three capillary and cavernous haemangiomas were produced. Since no metastases occurred and no clear-cut distinction between a merely expansive and a truly invasive growth was possible, the diagnosis of malignancy was based on the degree of cellular atypia and the mitotic activity. The benign-appearing fibrous histiocytomas showed a mean mitotic index of 0.06% and the malignant fibrous histiocytomas of 0.34%. The mitotic activity of the malignant histiocytoma was threefold (0.78%) as high as in the benign-appearing histiocytoma (0.25%). There exist close morphological similarities between the induced mesenchymal tumours in the rat and those occurring in the human bladder. Although the spectrum of histological types of mesenchymal tumours seen in the rat bladder was narrower than that encountered in man, MNU seems suitable for further studying the histogenesis, histopathology and biology of experimentally induced non-epithelial bladder neoplasms to gain information for a better understanding of the pathogenesis of human disease. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 PMID:2164825

  7. WHO Co-operative studies on a simple culture technique for the isolation of mycobacteria

    PubMed Central

    Šula, Ladislav

    1963-01-01

    Tuberculosis surveys are in progress in many countries that do not have adequate laboratory facilities for carrying out complicated bacteriological procedures. As part of a WHO co-operative research programme, studies have been undertaken with a view to developing a simple culture technique for the isolation of mycobacteria that does not require elaborate equipment. This paper is the first report on these co-operative studies. Storage and transport are known to affect adversely the viability of Mycobacterium tuberculosis in pathological specimens, thus giving rise to poor culture results and indicating the advisability of culturing such specimens on the spot. The preparation of the efficient and widely used Löwenstein-Jensen (L-J) culture medium, however, requires materials and facilities that are not easy available in developing countries. In an attempt to overcome this difficulty, the Tuberculosis Research Institute in Prague has developed a semi-synthetic liquid medium that can be prepared in bulk, concentrated and lyophilized, and sent even to distant laboratories. The present paper describes in detail the preparation of this lyophilized medium, which can be stored at room temperature for at least 6-12 months and is easy to reconstitute, and discusses the growth characteristics of mycobacteria multiplied in it. Experience in Czechoslovakia, where between 1953 and 1962 nearly 21 million cultures have been made with the medium, has shown that it is quite satisfactory and even slightly superior to L-J medium in certain respects. ImagesFIG. 1FIG. 2FIG. 3 & 4FIG. 9FIG. 10FIG. 11FIG. 12FIG. 5FIG. 6FIG. 7FIG. 8FIG. 13FIG. 14FIG. 15FIG. 16 PMID:14102036

  8. Haemopoietic phagocytes in the early differentiating avian retina.

    PubMed Central

    Cuadros, M A; García-Martín, M; Martin, C; Ríos, A

    1991-01-01

    The existence of specialised phagocytic cells is described in regions of the retinal neuroepithelium undergoing intense cell death during early differentiation of the avian embryo retina (2.5-5 days of incubation). These results were obtained using routine techniques for light microscopy, acid phosphatase histochemistry and immunocytochemical staining with antibodies MB-1 and QH-1, both specific for quail endothelial cells and all blood cells except mature erythrocytes. Specialised phagocytes were distinguishable from neuroepithelial cells on the basis of morphological criteria: in the former, the nucleus was not oval in shape and was not oriented perpendicular to basement membrane neuroepithelium. The cytoplasm of the specialised phagocytes was often filled with dead cell fragments. In contrast to neuroepithelial cells, the specialised phagocytes showed acid phosphatase activity and were labelled with both MB-1 and QH-1 antibodies in normal quail embryos and chick----quail yolk sac chimeras. Moreover, some acid phosphatase positive and MB-1/QH-1 positive cells also appeared in the presumptive vitreous body, at the edges of the optic cup and in the surrounding mesenchyme. As the vitreal cells and the specialised phagocytes of the neural retina were immunolabelled in chick----quail yolk sac chimeras, we conclude that they are derived from haemopoietic cells in the yolk sac. Some images suggest that these cells enter the vitreous body from the surrounding mesenchyme and traverse the basement membrane of the neuroepithelium in the optic disc region to give rise to the specialised phagocytes of the retinal neuroepithelium. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 PMID:1769889

  9. Immunocytochemical Localization and Time Course of Appearance of an Anionic Peroxidase Associated with Suberization in Wound-Healing Potato Tuber Tissue 1

    PubMed Central

    Espelie, Karl E.; Franceschi, Vincent R.; Kolattukudy, P. E.

    1986-01-01

    Thin sections of wound-healing potato tuber tissue were stained with rabbit antibody prepared against a suberization-associated anionic peroxidase and then stained with a goat anti-rabbit antibody-fluorescein conjugate. When these sections were examined with an epiilluminating fluorescence microscope, bright green fluorescent linear deposits were observed on the inner side of cell walls in the periderm layer. Initial deposits which were often not contiguous throughout the wall were first observed in some cells after 3 days of wound-healing and subsequently these layers became more pronounced so that all 6 day old periderm cells had green fluorescent layers on their inner walls. This fluorescence was not present in the walls of parenchyma cells or in the walls of periderm cells treated with preimmune serum and anti-rabbit IgG-FITC conjugate. Thin sections of wound-healing potato tissue which were stained with anti-peroxidase antibody and a goat anti-rabbit antibody-rhodamine conjugate exhibited a similar time course of development with a bright reddish-orange fluorescent layer observed on the inside wall of periderm cells. The production of this suberization-associated anionic peroxidase in wound-healing tissue was also demonstrated by an immunobinding dot blot assay which showed that the largest increase in the enzyme level occurred between 4 and 6 days of wound-healing. The present results support the hypothesis that this anionic peroxidase is involved in the deposition of the aromatic polymeric domain of suberin. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 and 15 PMID:16664843

  10. Proteins Associated with Adaptation of Cultured Tobacco Cells to NaCl 1

    PubMed Central

    Singh, Narendra K.; Handa, Avtar K.; Hasegawa, Paul M.; Bressan, Ray A.

    1985-01-01

    Cultured tobacco cells (Nicotiana tabacum L. cv Wisconsin 38) adapted to grow in medium containing high levels of NaCl or polyethylene glycol (PEG) produce several new or enhanced polypeptide bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The intensities of some of the polypeptide bands (molecular weights of 58, 37, 35.5, 34, 26, 21, 19.5, and 18 kilodaltons) increase with increasing levels of NaCl adaptation, while the intensities of other polypeptide bands (54, 52, 17.5, and 16.5 kilodaltons) are reduced. Enhanced levels of 43- and 26-kilodalton polypeptides are present in both NaCl and PEG-induced water stress adapted cells but are not detectable in unadapted cells. In addition, PEG adapted cells have enhanced levels of 29-, 17.5-, 16.5-, and 11-kilodalton polypeptides and reduced levels of 58-, 54-, 52-, 37-, 35.5-, 34-, 21-, 19.5-, and 18-kilodalton polypeptide bands. Synthesis of 26-kilodalton polypeptide(s) occurs at two different periods during culture growth of NaCl adapted cells. Unadapted cells also incorporate 35S into a 26-kilodalton polypeptide during the later stage of culture growth beginning at midlog phase. The 26-kilodalton polypeptides from adapted and unadapted cells have similar partial proteolysis peptide maps and are immunologically cross-reactive. During adaptation to NaCl, unadapted cells synthesize and accumulate a major 26-kilodalton polypeptide, and the beginning of synthesis corresponds to the period of osmotic adjustment and culture growth. From our results, we suggest an involvement of the 26-kilodalton polypeptide in the adaptation of cultured tobacco cells to NaCl and water stress. Images Fig. 1 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:16664357

  11. The orbital glands of the chelonians Pseudemys scripta and Testudo graeca: comparative histological, histochemical and ultrastructural investigations.

    PubMed Central

    Chieffi Baccari, G; DiMatteo, L; Minucci, S

    1992-01-01

    The orbital glands of the chelonians Pseudemys scripta and Testudo graeca were investigated at the histological, histochemical and ultrastructural levels. Four acinar cell types were seen in the harderian gland of P. scripta on the basis of histochemical reactions and ultrastructure. Secretory granules were of 2 types, one showing moderate electron density with an electronlucent core, the other being smaller and more osmiophilic with an electron-dense core. In the harderian gland of T. graeca only 2 glandular cell types were found; one type contained secretory granules with a dense core surrounded by a wide zone of lower density. Acinar cells of the anterior lacrimal gland in both species were of 2 types, one being of mucous type. In the harderian gland and in the lacrimal gland of both species, one cell type appeared not to be involved in the secretion of organic material. These cells contained numerous tightly packed mitochondria among which were abundant clumps of glycogen; the cell membrane was specialised at both edges. This cell type was similar ultrastructurally to the 'salt cells' described in the salt-secreting glands of various marine vertebrates, i.e. of the cells involved in transport processes. These combined histological, histochemical and ultrastructural studies have allowed us to distinguish orbital glands. In the past, the harderian and lacrimal glands in chelonians have often been mistaken for one another. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:1452463

  12. The liver of the brown trout, Salmo trutta fario: a light and electron microscope study.

    PubMed Central

    Rocha, E; Monteiro, R A; Pereira, C A

    1994-01-01

    A qualitative study by light and electron microscopy was undertaken on the liver of the brown trout, Salmo trutta fario. Vessels and bile ducts were observed to be scattered without any apparent order within the parenchyma. Venous profiles appeared either isolated or included in 'venous-arteriolar tracts' (VAT) and 'venous-biliary-arteriolar tracts' (VBAT). Bile ducts also appeared either isolated or in groups which often included an arteriole. The parenchyma was organised in tubules of hepatocytes encircling biliary passages radially. Those cells were uninucleate and contained large cytoplasmic areas of rough endoplasmic reticulum; lipid droplets and dense bodies sometimes also occupied a considerable portion of the cytoplasm. Microvilli extended from hepatocytes into biliary passages and towards the space of Disse. Other cell types encountered comprised biliary epithelial cells, macrophages (including melanin laden cells), fat-storing cells and endothelial cells. The biliary tree was formed sequentially by intra- and intercellular canaliculi, preductules, ductules and ducts. Canaliculi without microvilli are described for the first time in fishes. Structural differences between the brown trout and other fishes were noted. In contradistinction to other fishes, in brown trout the triads (i.e. the VBAT) are not just occasional structures; also, they probably transmit portal veins. Our observations support the concept of a tubular arrangement of hepatocytes in fish. The possibility that the axis of the tubule may be a sinusoid instead of a biliary passage is questioned. Homology between, on one hand, the segment formed by preductules and ductules and, on the other, the canal of Hering of mammals is defended. It is concluded that among salmonids notable interspecific differences do not seem to exist. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:7961130

  13. Alloxan diabetes in spontaneously hypertensive rats: gravimetric, metabolic and histopathological alterations.

    PubMed Central

    Iams, S. G.; Wexler, B. C.

    1977-01-01

    In order to investigate the combined effects of diabetes and hypertension on the pathogenesis of cardiovascular disease, adult male and female SHR rats which develop hypertension spontaneously were given a single, 10 mg or 15 mg/100 g body wt. injection of alloxan s.c. to induce moderate or severe diabetes. Insulin was deliberately withheld. Animals were examined by autopsy daily for 7 days post-alloxan and after 4 and 8 weeks. Mortality was high--only 52% of the males survived as against 80% of the females. Most deaths occurred on Day 5 and were associated with adrenal haemorrhage and hyperplasia, thymus galnd involution, fatty liver and marked hypotension despite elevated aldosterone levels. During the first week, corticosterone levels increased significantly in the male; in females they showed little change. After 4 weeks, the severly diabetic animals became emaciated and moribund; corticosterone and aldosterone levels fell to very low levels despite adrenal hyperplasia. The beta cells of the moderately diabetic animals eventually lost their ability to secrete insulin and these animals too became cachetic and moribund with concomitant elevation of lipid, glucose and BUN levels, as well as myocardial infarction, fatty liver, and generalized hyalin arteriolo-, arterio-, and nephrosclerosis. It is suggested that the combined hormonal and metabolic alterations of diabetes and hypertension reinforced one another in these spontaneously hypertensive rats, leading to intense stimulation of the hypothalamic-pituitary-adrenal system, the exacerbation of those cardiovascular degenerative changes known to be associated with uncontrolled diabetes or hypertension, eventual impaired adrenocortical steroidogenesis, hypotension and death. Images Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:861167

  14. Experimental Induction of Atheroarteriosclerosis by the Synergy of Allergic injury to Arteries and Lipid-Rich Diet

    PubMed Central

    Minick, C. Richard; Murphy, George E.

    1973-01-01

    Rabbits fed a lipid-rich, cholesterol-poor diet and given concomitant injections of foreign protein, over a period as long as 17 months, developed in their coronary arteries both a) proliferative fibromuscular intimal thickening closely resembling the diffuse intimal thickening that commonly occurs in coronary arteries of man, and b) fatty-proliferative fibromuscular intimal thickening that closely resembles coronary atherosclerosis in man. In contrast, rabbits of another group that were concurrently fed the same diet for as long as 22 months without injections of foreign protein developed changes in arteries of their hearts that resemble neither coronary atherosclerosis nor diffuse intimal thickening in man. Fatty-proliferative changes in aortas of the first group of rabbits are strikingly greater and more closely resemble human aortic atherosclerosis than those in the latter group. In the course of the experiments, the average serum cholesterol was not significantly different in the two groups of rabbits. It was approximately 200 to 250 mg%, which is the average serum cholesterol in adult humans in the United States. These experiments support the hypothesis that the synergy of arterial injury, in particular immunologic injury, and a diet rich in lipid can lead to atherosclerosis in man. ImagesFig 24Fig 25Fig 26,27Fig 28Fig 29Fig 30Fig 31Fig 32Fig 33Fig 34Fig 1Fig 2Fig 3Fig 4Fig 5Fig 6Fig 7Fig 35Fig 36Fig 37Fig 38Fig 8Fig 9Fig 10Fig 11Fig 12Fig 13Fig 14Fig 15Fig 16Fig 17Fig 18Fig 19Fig 20Fig 21Fig 22Fig 23 PMID:4758786

  15. Diffusely infiltrated lymphoid areas of the bursa of Fabricius (DIA) and of the cloaca: an embryological study with morphological analogies.

    PubMed Central

    Dolfi, A; Lupetti, M; Bianchi, F; Michelucci, S

    1988-01-01

    The aim of the present experiment was to verify whether the origin of the DIA is ectodermal or endodermal. A rabbit serum against the epithelial cells of the final portion of the cloaca was prepared. The indirect immunofluorescence method was applied to strips obtained with a cryostat, carefully cut in such a way as to include a part of the cloaca, the burso-cloacal stalk, the DIA, and the bursal plicae. In this way, it was possible to demonstrate that the epithelium of the cloaca, of the burso-cloacal stalk, and of the DIA exhibited an intense fluorescence that could not be observed at the level of the epithelium of the bursal plicae. These findings would appear to indicate that the DIA, like the cloaca and the burso-cloacal stalk, is ectodermal in origin. Furthermore, histological study revealed that the DIA exhibits close structural analogies with the dorsal wall of the cloaca. In both areas, unorganized lymphoid infiltrations of the tunica propria can be seen, and the epithelium does not show any follicle-associated epithelial cells. The glands often assume the aspect of dilated crypts containing intestinal transit material. The epithelium of these glands reveals lymphoid infiltrations at various points, and it is not uncommon to detect accumulations of cells in their lumina. Several groups of eosinophilic granulocytes can also be observed in the tunica propria of these two areas, with a clear predominance at the level of the DIA. These similarities between the cloaca and the DIA might lead one to suppose the existence of a functional as well as a morphological correspondence. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 PMID:3417544

  16. The pathology of Tangier disease. A light and electron microscopic study.

    PubMed Central

    Ferrans, V. J.; Fredrickson, D. S.

    1975-01-01

    23-26 Figs 8 and 9 Fig 10 Fig 11 Figs 37 and 38 Fig 27 Fig 39 PMID:162820

  17. Eimeria tenella (Gallus domesticus)

    PubMed Central

    Pierce, A. E.

    1962-01-01

    Complete immunity to a challenge dose of 100,000 sporulated oocysts of Eimeria tenella was developed in fowls 14 days after they had received the last of three graded doses of oocysts of this species, whereas uninfected fowls of comparable age were fully susceptible. In fowls similarly immunized, no detectable first-generation schizogony developed from challenge doses of 10 million oocysts administered to each fowl 21 days after the last of the three graded doses had been administered. Precipitating antibodies were demonstrated in some but not all of these immune fowls by the agar-gel diffusion technique. Precipitin bands, developed as the result of infection, showed a reaction of identity with those induced by parenteral injection of schizont antigen and most of the bands appeared to be directed against protein antigens. Cross reactions were observed between E. tenella antiserum and antigens prepared from the species of coccidia, E. tenella from the fowl and the species E. stiedae from the rabbit. Electrophoretic analysis of serum from immune birds showed an albumin component and four globulin fractions (I-IV); antibody activity was confined to the fraction with the slowest mobility (IV). No significant differences were shown between the electrophoretic analyses at comparable ages of serum from the infected and control groups of fowls between 7 and 63 days of age. The components in both groups altered significantly with time, showing a general rise in protein concentrations. Infected fowls repeatedly showed numerous pyroninophilic cells in the gut mucosa and cells closely resembling globular leucocytes in the deep glands of the caeca. ImagesFIG. 1FIG. 2FIG. 3FIG. 4FIG. 5FIG. 6FIG. 7FIG. 8FIG. 9FIG. 10FIG. 11FIG. 12 PMID:14486445

  18. Age changes in the triangular fibrocartilage of the wrist joint.

    PubMed Central

    Mikić, Z D

    1978-01-01

    On the basis of a study of 180 wrist joints from 100 fresh cadavers of individuals ranging in age from fetuses to 94 years, it is concluded that the triangular fibro-cartilage is very liable to degenerative alterations associated with ageing. Degeneration begins in the third decade and progressively increases in frequency and severity in subsequent decades. The changes comprise reduced cellularity, loss of elastic fibres, mucoid degeneration of the ground substance, exposure of collagen fibres, fibrillation, erosion, ulceration, abnormal thinning, and, ultimately, disc perforation. The changes are more frequent and more intense on the ulnar surface, and they are always situated in the central part of the disc. It appears that disc perforation is degenerative and age-related: thus there were no perforations in the first two decades of life; in the third there were 7.6%, in the fourth 18.1%, in the fifth 40.0%, in the sixth 42.8%, and in the over sixties 53.1%. There was an associated pattern of degenerative changes in the wrist joint as a whole. The structures adjacent to the articular disc (discal surface of the ulnar head, discal part of the lunate) were much more often involved, and the changes were much more advanced, than on non-discal surfaces. It is argued that this is because of more intensive biomechanical forces, particularly rotational forces, in the disc compartment of the joint. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 (cont.) Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 PMID:670069

  19. Structural changes in fluorosed dental enamel of red deer (Cervus elaphus L.) from a region with severe environmental pollution by fluorides.

    PubMed Central

    Kierdorf, U; Kierdorf, H; Sedlacek, F; Fejerskov, O

    1996-01-01

    A macroscopic, microradiographic and scanning electron microscope study was performed on the structure of fluorosed dental enamel in red deer from a fluoride polluted region (North Bohemia, Czech Republic). As was revealed by analysis of mandibular bone fluoride content, the rate of skeletal fluoride accumulation in the fluorotic deer was about 6 times that in controls taken from a region not exposed to excessive fluoride deposition. In all fluorosed mandibles, the 1st molar was consistently less fluorotic than the other permanent teeth. This was related to the fact that crown formation in the M1 takes place prenatally and during the lactation period. Fluorosed teeth exhibited opaque and posteruptively stained enamel, reduction or loss of enamel ridges, moderately to grossly increased wear and, in more severe cases, also enamel surface lesions of partly posteruptive, partly developmental origin. Microradiographically, fluorosed enamel was characterised by subsurface hypomineralisation, interpreted as a result of fluoride interference with the process of enamel maturation. In addition, an accentuation of the incremental pattern due to the occurrence of alternating bands with highly varying mineral content was observed in severely fluorosed teeth, denoting fluoride disturbance during the secretory stage of amelogenesis. A corresponding enhancement of the incremental pattern was also seen in the dentine. The enamel along the more pronounced hypoplasias consisted of stacked, thin layers of crystals arranged in parallel, indicating that the ameloblasts in these locations had lost the distal (prism-forming) portions of their Tomes processes. The findings of the present study indicate that red deer are highly sensitive bioindicators of environmental pollution by fluorides. Images Figs 2-9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 Fig. 26 PMID:8655406

  20. Annual changes in the number, testosterone content and ultrastructure of glandular tissue cells of the testis in the marbled newt Triturus marmoratus.

    PubMed Central

    Fraile, B; Paniagua, R; Rodríguez, M C; Sáez, F J; Jimenez, A

    1989-01-01

    The testes of 8 specimens of Triturus marmoratus were collected during each month of 1987 and processed for electron microscopy and light microscopy demonstration of testosterone (T) following the ABC (avidin-biotin peroxidase complex) method. According to their staining affinity for anti-T antibodies, the glandular tissue cells were classified as T-, T+, T++, and T and the annual changes in the numbers of these cell populations, as well as in the volume occupied by the glandular tissue, were calculated. The volume occupied by the glandular tissue increases from September to December; it begins to decrease in April and disappears from June to August. The glandular tissue is formed from the interstitial cells that surround the lobules containing differentiating germ cells. During the spermatogenic process, the interstitial cells do not show staining affinity for anti-T antibodies. In August-September, the interstitial cells around the lobules that have completed spermatogenesis become positively stained (T+) and form the glandular tissue when the spermatozoa leave the testis. The numbers of intensely stained cells in the glandular tissue (T++ and T ) increase from September to November; begin to decrease in December; disappear in January-February; increase again in March and decrease again in April until they disappear in June-September. The interstitial cells, before their transformation in glandular tissue, are ultrastructurally similar to fibroblasts. After their transformation these cells increase in size and develop abundant smooth endoplasmic reticulum, mitochondria with tubular cristae and lipid droplets. This morphological pattern is maintained in the glandular tissue from September to April in spite of the changes in staining affinity during this period. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:2630543

  1. Pathological changes in the brains of mice infected with Toxoplasma gondii: a histological, immunocytochemical and ultrastructural study.

    PubMed Central

    Ferguson, D. J.; Graham, D. I.; Hutchison, W. M.

    1991-01-01

    The pathological changes in the brains of mice infected with T. gondii were studied at various intervals between 7 days and 22 months post-infection using histology, immunocytochemistry and electron microscopy. Initially, a few single parasites were observed (day 7) but necrotic lesions and microglial and inflammatory nodules rapidly appeared (9-I4 days). The majority of the lesions between days 9 and I4 contained proliferating toxoplasma and early cyst formation but from 2I days onwards the vast majority of nodules contained neither parasites nor Toxoplasma antigen. Intact intracellular cysts persisted throughout the period of study eliciting no host response. A generalized meningoencephalitis developed by day II and persisted with varying degrees of severity throughout the 22 months studied. At first, the inflammatory cells consisted of lymphocytes and monocyte/macrophages but during the chronic phase plasma cells predominated. In chronic infections, the number of microglial/inflammatory nodules was relatively constant with only a few containing toxoplasmic material resulting from recent cyst rupture. A few brains contained small nodules of dystrophic calcification. This study shows that in these asymptomatic animals, the major feature is perivascular cuffing by mononuclear cells and localized microglial/inflammatory nodules. After the development of the chronic state, there is no obvious increase or decrease in the severity of the pathological changes with time. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Figs. 8-9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 PMID:1883744

  2. A re-investigation of the centres of ossification in the avian skeleton at and after hatching.

    PubMed Central

    Hogg, D A

    1980-01-01

    The centres of ossification occurring in the skeleton of the domestic fowl from hatching onwards have been re-investigated in groups of birds from the same hatches, reared under standardised conditions and sampled at intervals from hatching to 182 days. Selected areas have been surveyed in adult birds. The numerous centres which are already present at hatching have been identified. Those first appearing around the time of hatching were for the uncinate processes and the phalanx of digit IV. The centres appearing after hatching were those for metacarpal II, four carpal centres, the orbitosphenoid, rostal and caudal basibranchials, epibranchials, entoglossal, proximal tibial centre, patella and tarsal sesamoid. These have been illustrated and the mean time of appearance and range of time of appearance of each calculated. Some evidence of slight variation in sequence of appearance was detected. The proximal tibial centre was concluded to be the only true secondary centre in the long bones and to correspond to the traction epiphysis of this region in the mammal. In adults, the phalangeal formula of the manus was found usually to be 2:2:1, but occasionally it was reduced to 1:2:1. The only sesamoidean centre found, other than the patella and the tarsal sesamoid, was in the carpal region and was termed the dorsal carpal sesamoid. Some of the many controversies existing in the previous literature have been assessed in the light of the findings of this study. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:7429964

  3. Further Studies on Induction of Stomach Cancer in Hamsters by N-methyl-N′-nitro-N-nitrosoguanidine*

    PubMed Central

    Kogure, K.; Sasadaira, H.; Kawachi, T.; Shimosato, Y.; Tokunaga, A.; Fujimura, S.; Sugimura, T.

    1974-01-01

    Oral administration of N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) to hamsters at a concentration of 50-83 μg/ml in the drinking water resulted in a high incidence of tumours in the glandular stomach. Short-term administration of MNNG for 4-6 months resulted in more adenocarcinomata in the glandular stomach than long-term administration for 7-8 months. One case of metastasis of an adenocarcinoma of the glandular stomach to the liver and 2 cases of metastasis to the regional lymph nodes were found. Spindle cell sarcomata in the glandular stomach and adenocarcinomata in the duodenum were also often produced. Oral administration of MNNG at the very high concentration of 500-2000 μg/ml induced a hepatic cell carcinoma, intrahepatic bile duct carcinomata, bile duct cystadenomata and cystic dilatation, and a haemangioma in the liver but no tumour in the glandular stomach. Sequential morphological studies on the glandular stomach of hamsters receiving 50 μg/ml of MNNG in the drinking water showed 3 stages of change of the mucosa. The mucosa became atrophic and eroded in the first 16 weeks. Irregular atypical glands developed at the margins of erosions and proliferation of spindle cells in the submucosa were found after 18 weeks. Spindle cell sarcomata developed in animals after 20 weeks. Adenocarcinomata developed between 25 and 32 weeks. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12 PMID:4830138

  4. Prolonged administration of antithymocyte serum in mice. II. Histopathological investigation

    PubMed Central

    Simpson, Elizabeth; Nehlsen, Sandra L.

    1971-01-01

    Prolonged administration of ATS to mice resulted in depletion of small lymphocytes in the thymus-dependent (paracortical) areas of lymph nodes in all mice. Small lymphocyte depletion of the thymus-dependent periarteriolar region of the spleen was present in most mice, although this feature was masked by plasmacytosis in this region in some. Depletion of small lymphocytes in the thymus-dependent areas of Peyer's patches was evident in some of the younger mice. None of these changes in lymphoid organs were seen in control mice, untreated or given NRS. The thymus was unaffected except in some ATS- or NRS-treated mice which were sick and/or old, in which the narrowing of the thymic cortex was attributed to non-specific stress. Plasmacytosis was seen in the medullae of lymph nodes of both ATS- and NRS-treated mice, although it was more intense in the latter. In non-lymphoid organs the most striking changes were seen in the kidneys of mice treated both with ATS and NRS. Complex-type nephritis followed by amyloidosis was seen in a large proportion of mice over 6 months old in both these groups and in these mice amyloid was seen frequently in other organs, including spleen and liver. Tumours occurred in fifty-four ATS-treated mice, but in no other group. Fifty-two of these tumours were attributable to polyoma virus; two other were lymphoblastomas. Reticulum cell hyperplasia was seen in two further mice. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17Fig. 18 PMID:4326920

  5. The atrioventricular valves of the mouse. I. A scanning electron microscope study.

    PubMed Central

    Icardo, J M; Arrechedera, H; Colvee, E

    1993-01-01

    This paper reports a scanning electron microscope study of the morphology of the atrioventricular (AV) valves in the mouse. The leaflet tissue of the 2 AV valves consists of a continuous veil that shows no commissures or clefts. In all instances, the chordae that arise from the papillary system merge with the free border of the leaflet tissue. No distinct terminations of chordae were observed on the ventricular face of the valves. The leaflet tissue of the right AV valve can be divided into parietal and septal components on the basis of the insertion into the ventricular wall and of the papillary system. While the septal component is similar in shape, location and tension apparatus to the septal tricuspid leaflet in man, the parietal component appears to correspond to the anterior and posterior human leaflets. This segment of the valve is served by 3 papillary muscles that arise from the septal wall. The right AV valve is not a tricuspid structure from the morphological standpoint, but appears to function as such because of the particular attachment of the papillary muscles. The leaflet tissue of the mitral valve is served by 2 papillary muscles, anterior and posterior, which consist of muscular trabeculae extending from the heart apex to the base of the valve. These muscles remain associated with the ventricular wall. The leaflet tissue attaches directly to these papillary muscles, which give rise to a very small number of slender chordae. There are thus several important differences between the AV valves of the mouse and man.(ABSTRACT TRUNCATED AT 250 WORDS) Images Fig. 1 Fig. 2 Fig. 3 Figs 4-6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:8509303

  6. Cell death during the postnatal morphogenesis of the normal rabbit kidney and in experimental renal polycystosis.

    PubMed Central

    García-Porrero, J A; Ojeda, J L; Hurlé, J M

    1978-01-01

    We have studied, by means of optic and electron microscopy, the normal and abnormal cell death that takes place during the postnatal morphogenesis of rabbit kidney, and in the experimental renal polycystosis produced by methylprednisolone acetate. In the normal kidney intertubular cell death can be observed during the first 20 days of the postnatal development. However, cell death in the normal metanephric blastema is a very rare event. In the polycystic kidney numerous dead cells can be seen between the third and forty eighth days after injection. The topography and morphology of the dead cells depend on the stage in the evolution of the disease. In the 'stage of renal immaturity', dying and dead cells are present in the nephrogenic tissue, in the dilating collecting tubules and in the intertubular spaces. In this stage the cellular pathology is essentially nuclear. In the stage of tubular cysts, the dead cells are mostly located in the walls of cysts, with some dead cells, but mostly cellular debris in their lumina. At this stage the cellular pathology is basically cytoplasmic. The dead cells are eventually digested by what appear to be phagocytes of tubular epithelial origin. It is suggested that cell death is an important factor in the evolution of the lesions of renal polycystosis induced by corticosteroids, and probably in the initiation of the pathological process as well. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 18 Fig. 19 PMID:670065

  7. Implementation of Unsteady Double-Axis of Rotation Motion to Predict Pitch-Damping Moment

    DTIC Science & Technology

    2016-10-18

    10 Fig. 9 File -based body spinning rotation motion ...........................................11 Fig. 10 The 6...The rotation about the body axis (spinning motion) is setup using the “ File -Based Single-Axis Rotational motion” option, and the rotation about the...After clicking on “Details” for “ File -Based Single-Axis Rotational motion (body frame)”, the user is prompted for the number of sets of grid velocity

  8. Development of peptide-containing nerves in the human fetal prostate gland.

    PubMed Central

    Jen, P Y; Dixon, J S

    1995-01-01

    -ENK-IR nerves together with a few m-ENK-IR nerves. Occasional smooth muscle-associated varicose nerve fibres showed immunoreactivity for SP, CGRP, VIP or BOM although the majority of these types of nerve formed perivascular plexuses. Also at 26 wk numerous varicose nerve fibres were observed in association with the prostatic acini, the majority of such nerves containing NPY with a few showing immunoreactivity to VIP, l-ENK, SP or CGRP.(ABSTRACT TRUNCATED AT 400 WORDS) Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:7591978

  9. The morphology of the lung of the black mamba Dendroaspis polylepis (Reptilia: Ophidia: Elapidae). A scanning and transmission electron microscopic study.

    PubMed Central

    Maina, J N

    1989-01-01

    evolution of the lungs of the air-breathing vertebrates from lower through to higher vertebrates. The gross and ultrastructural heterogeneity of the organisation of the ophidian lung is illustrated and the dearth of pulmonary morphological data in this taxon is pointed out. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 PMID:2630539

  10. Cytochemical localisation and characterisation of proteoglycans (glycosaminoglycans) in the epithelial-stromal interface of the seminal vesicle of the guinea pig.

    PubMed Central

    Chan, L; Wong, Y C

    1992-01-01

    The proteoglycans (PGs) in the guinea pig seminal vesicle were demonstrated ultrastructurally by both cuprolinic blue (CB) and ruthenium red (RR) staining. The PGs appeared as electron-dense granules with RR, but were filamentous following CB staining using the critical electrolyte concentration method. Three major types of PGs (T1, T2, T3) have been described according to their different locations and sizes. T1 filaments were short and were found mostly on both sides of the lamina densa of the basal lamina of the glandular epithelium (40-60 nm long) and also on the basal laminae of smooth muscle cells and capillary endothelial cells (20-30 nm long). In the epithelial basal lamina they were regularly spaced at an interval of 40-60 nm. T1 filaments in the lamina densa were smaller and more randomly distributed. Cytochemical characterisation of these PGs by various GAG degrading enzymes showed that T1 PGs are rich in heparan sulphate. T2 filaments were 30-40 nm long and closely associated with the collagen fibrils. They were arranged perpendicular to the long axis of collagen fibrils, also at intervals of about 60 nm. T2 filaments were removed by chondroitinase (Ch)-ABC, Ch-ABC plus Streptomyces (S)-hyaluronidase and pronase, but resistant to nitrous acid, heparitinase, heparinase, neuraminidase and S-hyaluronidase. These show that T2 filaments are rich in dermatan sulphate. T3 filaments (60-100 nm) were widely distributed in the stroma at sites such as the interstitial spaces of the lamina propria, the reticular layer below the basal lamina, around individual collagen fibrils or bundles of such fibres, and on the cell surfaces of fibroblasts. The T3 filaments were removed by Ch-ABC, Ch-AC and pronase but were resistant to heparitinase, heparinase, S-hyaluronidase, neuraminidase and nitrous acid. They are therefore rich in chondroitin sulphate. Images Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig

  11. An Experimental Investigation of the Lymphatic System of the Teeth and Jaws

    PubMed Central

    MacGregor, Alexander

    1936-01-01

    are given, and the lines on which further experiments are being continued are indicated. Finally, the application of the results to the pathology of infection in this region, particularly paradontal disease, is given, and also their application to the phenomena of injection anæsthesia. ImagesFig. 18Fig. 19Fig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17 PMID:19990818

  12. Splenic trauma. Choice of management.

    PubMed Central

    Lucas, C E

    1991-01-01

    severely shattered spleen; these patients usually are treated best by early operative intervention. Following splenectomy for injury, polyvalent pneumococcal vaccine decreases the likelihood of OPSI and should be used routinely. The role of prophylactic penicillin is uncertain but the use of antibiotics for minor infectious problems is indicated after splenectomy. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. PMID:1992948

  13. Endemic syphilis in the Bakwena Reserve of the Bechuanaland Protectorate

    PubMed Central

    Murray, J. F.; Merriweather, A. M.; Freedman, M. L.

    1956-01-01

    A form of endemic syphilis exists in the Bakwena Reserve of the Bechuanaland Protectorate known by the local name of “dichuchwa”. It is similar to bejel, njovera and the endemic syphilis reported elsewhere in the world. The Government of the Protectorate, with the assistance of WHO and UNICEF, began in November 1953 a mass campaign in the Reserve to control this disease and, at the same time, to study its epidemiological, clinical, social and therapeutic aspects. The seropositivity rate in the Reserve was found to be 37%. Dichuchwa is a childhood and family disease, usually spread non-venereally. The early lesions are similar to secondary lesions of sporadic venereal syphilis, and are often followed by tertiary lesions affecting mainly the skin, nasopharynx and long bones. Primary lesions are rare but may occur under certain epidemiological conditions if the inoculum is sufficiently large; thus a mother may develop primary sores on the nipples through suckling an infected infant. Lesions of the cardiovascular and central nervous systems and congenital syphilis are also rare. Superinfection of an already infected and allergic host is probably the chief reason for the frequency of the tertiary lesions. Treatment of the disease with penicillin is very effective, and the authors believe that mass treatment of cases and contacts combined with an improvement in the standards of hygiene could eradicate the disease. ImagesFig. 61Fig. 62Fig. 63Fig. 64Fig. 74Fig. 75Fig. 76Fig. 1Fig. 2Fig. 3Fig. 16Fig. 17Fig. 18Fig. 43Fig. 44Fig. 45Fig. 7Fig. 8Fig. 9Fig. 13Fig. 14Fig. 15Fig. 31Fig. 32Fig. 33Fig. 50Fig. 51Fig. 52Fig. 53Fig. 54Fig. 55Fig. 56Fig. 34Fig. 35Fig. 36Fig. 46Fig. 47Fig. 48Fig. 49Fig. 22Fig. 23Fig. 24Fig. 10Fig. 11Fig. 12Fig. 57Fig. 58Fig. 59Fig. 60Fig. 65Fig. 66Fig. 67Fig. 19Fig. 20Fig. 21Fig. 4Fig. 5Fig. 6Fig. 68Fig. 69Fig. 70Fig. 71Fig. 72Fig. 73Fig. 37Fig. 38Fig. 39Fig. 28Fig. 29Fig. 30Fig. 25Fig. 26Fig. 27Fig. 40Fig. 41Fig. 42 PMID:13404470

  14. From Osler to Olafson. The evolution of veterinary pathology in North America.

    PubMed Central

    Saunders, L Z

    1987-01-01

    of instruction. However, by 1884, Osler had already left his indelible imprint on the students (both medical and veterinary) he had taught in Montreal, one of whom took over the teaching of pathology in the veterinary college. Another, who followed Osler's example and also studied in Berlin with Virchow, wrote the first book in the English language on veterinary post mortem technique in 1889.(ABSTRACT TRUNCATED AT 400 WORDS) Images Fig. 1. Fig. 2. Fig. 4. Fig. 6. Fig. 8. Fig. 9. Fig. 10. Fig. 11. Fig. 12. Fig. 13. Fig. 14. Fig. 15. PMID:3552167

  15. The harderian gland: a tercentennial review.

    PubMed Central

    Payne, A P

    1994-01-01

    The harderian gland was first described in 1694 by Johann Jacob Harder (1656-1711). It occurs in most terrestrial vertebrates and is located within the orbit where, in some species, it is the largest structure. It may be compound tubular or compound tubuloalveolar, and its secretory duct is usually morphologically distinct only after leaving the substance of the gland to open on the surface of the nictitating membrane. The tubules of the gland are formed of a single layer of columnar epithelial cells surrounded by myoepithelial cells. The chief product(s) of the gland varies between different groups of vertebrates, and epithelial cells possess granules or vacuoles whose contents may be mucous, serous or lipid. In rodents, the gland synthesises lipids, porphyrins and indoles. In the case of lipid vacuoles, the gland is unusual in releasing these by an exocytotic mechanism. It is unclear whether the gland can act both as an exocrine and endocrine organ. There is control of gland structure and synthesis through a variety of humoral agents, including gonadal, thyroid and pituitary hormones; in addition there is a rich autonomic innervation and many neuropeptides have been identified. The proposed functions of the gland are remarkably diverse and include the gland being (1) a source of 'saliva', (2) a site of immune response, (3) a photoprotective organ, (4) part of a retinal-pineal axis, (5) a source of pheromones, (6) a source of thermoregulatory lipids, (7) a site of osmoregulation, and (8) a source of growth factors. The gland is discussed in terms of its embryology and phylogeny, and in relation to ecological variables. Several goals of future research are identified. Images Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 16 Fig. 17 Fig. 18 Fig. 19 Fig. 20 Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 Fig. 26 Fig. 27 Fig. 28 Fig. 29 Fig. 30 Fig. 31 Fig. 32 Fig. 36 Fig. 37 Fig. 38 Fig. 40 PMID:7559104

  16. Periosteal response in translation-induced bone remodelling.

    PubMed Central

    Feik, S A; Ellender, G; Crowe, D M; Ramm-Anderson, S M

    1990-01-01

    reflected in the periosteum which functions as an integrated unit modulating the signal transmitted to the osteoblasts which play a key role in events occurring at the bone surface. Changes are not attributable to internal bone strain. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 PMID:2081711

  17. Light and Electron Microscopic Studies of the Rat Kidney After Administration of Inhibitors of the Citric Acid Cycle In Vivo

    PubMed Central

    McDowell, Elizabeth M.

    1972-01-01

    2Fig 3Fig 4Fig 5Fig 6Fig 7Fig 8Fig 9Fig 10Fig 11Fig 12Fig 13Fig 14Fig 15Fig 16Fig 17Fig 18Fig 19 PMID:4258508

  18. Pacesetters of the American image or (a case for a pleasant diversion).

    PubMed Central

    Hook, E. W.

    1992-01-01

    Regardless of how you resolve the morality of our history, the fact is that Currier and Ives documented in their own special and often biased way the iconography of the growth and development of the United States of America (Fig. 88) in some of the most eventful years of its history from about 1840 through 1895. Now, as we near our 500th anniversary commemoration of Columbus' voyage to the Americas, it seems especially appropriate to review--to think about all of this. I think you have sensed, as we have gone along, that learning about Currier and his colleagues--these pacesetters of the American Image--has meant, as Osler predicted, a pleasant diversion for me. These activities have carried me into new areas of interest, expanding my perspective of the American Image--of people, of medicine, of life in general, and aiding in the identification of values, my own, as well as those of others. All along, my knowledge has been enhanced, especially of the history of this wonderful complex country of ours. Furthermore, and of considerable importance, this endeavor has sharpened my power of observation. I have, like a good doctor should do, learned to look better! Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 Fig. 19 Fig. 18 Fig. 20 Fig. 21 Fig. 23 Fig. 25 Fig. 27 Fig. 26 Fig. 28 Fig. 29 Fig. 30 Fig. 31 Fig. 32 Fig. 33 Fig. 34 Fig. 35 Fig. 36 Fig. 37 Fig. 39 Fig. 40 Fig. 41 Fig. 42 Fig. 43 Fig. 44 Fig. 45 Fig. 46 Fig. 47 Fig. 48 Fig. 49 Fig. 50 Fig. 51 Fig. 52 Fig. 53 Fig. 54 Fig. 55 Fig. 56 Fig. 57 Fig. 58 Fig. 59 Fig. 60 Fig. 61 Fig. 62 Fig. 63 Fig. 64 Fig. 65 Fig. 66 Fig. 68 Fig. 67 Fig. 69 Fig. 70 Fig. 71 Fig. 72 Fig. 73 Fig. 74 Fig. 75 Fig. 76 Fig. 77 Fig. 78 Fig. 79 Fig. 80 Fig. 82 Fig. 81 Fig. 83 Fig. 84 Fig. 85 Fig. 86 Fig. 87 Fig. 88 PMID:1413369

  19. Structure of the Thylakoids and Envelope Membranes of the Cyanelles of Cyanophora paradoxa1

    PubMed Central

    Giddings, Thomas H.; Wasmann, Cathy; Staehelin, L. Andrew

    1983-01-01

    isolated cyanelles exhibits two additional layers: (a) a 5- to 7-nanometer-thick layer that lies adjacent to the inner membrane and which seems to correspond to the peptidoglycan layer of cyanobacteria; and (b) a layer external to the purported peptidoglycan layer that exhibits fracture faces similar to those of the lipopolysaccharide layer of gram negative bacteria. Our findings indicate that the supramolecular architecture of cyanelles differs only slightly from free-living cyanobacteria to which they are presumably related. Images Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 1 Fig. 2 Fig. 3 Fig. 6 Fig. 11 Fig. 12 Fig. 13 Fig. 14 Fig. 16 Fig. 17 Fig. 18 PMID:16662839

  20. The avian egg and the retina

    PubMed Central

    MALCOLM, J. E.

    1973-01-01

    A mathematical model for study of blood flow has been derived from the avian egg, utilizing the theories of crystallography and photosynthesis. The model is employed to explain the form of the eye and the function of the cells of the human retina, with special reference to colour vision and the pathology of migraine. ImagesFig. 1Fig. 4Fig. 5Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11 PMID:4736600

  1. Occlusive Peripheral Arteriosclerosis: Treatment by Percutaneous Transluminal Recanalization—“The Dotter Procedure”

    PubMed Central

    Palayew, M. J.; Sedlezky, I.; Sigman, H. H.; Sheiner, N. M.

    1969-01-01

    We have performed 17 percutaneous transluminal dilatations in 15 patients with segmental stenoses of the femoral and popliteal arteries. Initial success was achieved in 14 instances. This technique must be considered a useful adjunct in the treatment of peripheral vascular disease in selected patients. Its use along with endarterectomy has not been previously reported and warrants further investigation. ImagesFIG. 2FIG. 3FIG. 4FIG. 5FIG. 6FIG. 7FIG. 8FIG. 9FIG. 10FIG. 11 PMID:5353151

  2. Hyperparathyroidism: retrospect and prospect.

    PubMed Central

    Taylor, S.

    1976-01-01

    The history of hyperparathyroidism is outlined and the diagnosis and treatment of its various causes reviewed with reference to a series of 153 patients operated on for hyperparathyroidism in the past 20 years. In 119 cases the condition was primary, being due to a tumour or hyperplasia. Future developments in this field are briefly considered. Images Fig. 1 Fig. 3 Fig. 4 Fig. 2 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 PMID:782326

  3. The biomechanical ambiguity of the articular surface.

    PubMed Central

    Kamalanathan, S; Broom, N D

    1993-01-01

    A series of micromechanical tests carried out on the articular surface of cartilage have provided an accurate description of the mechanical properties of any one site with respect to the orientation framework obtained from its characteristic split-line direction. Ultrastructural studies revealed little evidence that the split-line direction correlated strongly with any preferred alignment of fibrils. This paper therefore offers a new interpretation of the biomechanical significance of the widely used split-line test for the articular surface of cartilage. Images Fig. 9 Fig. 2 Fig. 6 Fig. 7 Fig. 8 Fig. 10 Fig. 11 PMID:8300433

  4. Percutaneous Transluminal Angioplasty in Peripheral Vascular Disease: A Review

    PubMed Central

    Louis, Eugene L. St.; Provan, John L.; Gray, Robin R.; Grosman, Harvey; Ameli, F. Michael; Elliott, David S.

    1982-01-01

    Percutaneous transluminal angioplasty is a relatively new technique employed in the treatment of stenoses or occlusions of peripheral arteries. While the longterm success rates have yet to be determined, short-term results have been excellent. The procedure has greatest value in the dilatation of localized lesions, avoiding surgery and its attendant risks. However, PTA and surgery are complementary, not competing, modes of therapy. PTA complements the traditional therapy of peripheral vascular disease, which remains reconstructive surgery. ImagesFig. 7Fig. 8Fig. 9Fig. 10Fig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6 PMID:21286052

  5. An account of the longitudinal mucosal corrugations of the human tracheo-bronchial tree, with observations on those of some animals.

    PubMed Central

    Monkhouse, W S; Whimster, W F

    1976-01-01

    A description is given of the distribution of the longitudinal mucosal corrugations in the human tracheo-bronchial tree. It has been shown that they are made up of elastic tissue in a collagen matrix, and that the elastic fibres continue into the smallest bronchioles beyond where the corrugations are no longer visible. An examination has also been made of the tracheo-bronchial trees of the hen, rat, raccoon, pig, sheep, llama and tiger. Corrugations are present in all these animals, except the hen and the raccoon, and they have been compared and contrasted with the condition in Man. The functional significance of these corrugations remains unknown, but, they could be important in equalizing tension in the tracheo-bronchial tree during inspiration, as well as in providing elastic recoil during expiration. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 11 Fig. 12 PMID:1010796

  6. British surgical aid to Jordan

    PubMed Central

    Boyd, N. A.; Barry, N. A.; Davies, A. K.

    1971-01-01

    The surgical commitment of No. 2 Field Hospital, R.A.M.C., during its stay in Jordan is presented. The majority of patients that were admitted had sustained war wounds, many of which were infected due to the delay in treatment. The difficulties encountered in their subsequent management are discussed. Special reference is made to the use of ketamine (Ketalar) and mafenide acetate (Sulphamylon) in the treatment of those burns cases under our care. It is the first time for many years that a British field hospital has been employed in an active rôle. ImagesFig. 1Fig. 3Fig. 4Fig. 8Fig. 11Fig. 12Fig. 13Fig. 14Fig. 2Fig. 5Fig. 6Fig. 7Fig. 9Fig. 10 PMID:5114910

  7. Achondrogenesis type I. A familial subvariant?

    PubMed Central

    Lauder, I; Ellis, H A; Ashcroft, T; Burridge, A

    1976-01-01

    The clinical, pathological, and radiological features of 2 male sibs with a severe and lethal form of micromelic dwarfism are desribed. The family also includes 2 normal sibs. The histological and radiological appearances suggested a diagnosis of achondrogenesis type I, but the markedly deficient ossification of the skull and the presence of intrauterine rib fractures were atypical. These changes have been observed in two other families with 2 or more infants with suspected achondrogenesis, raising the possibility that these familial cases may be a subvariant of achondrogesis or even a distinct disease entity. The disease appears to be inherited as an autosomal recessive and death occurs shortly after birth because of severe pulmonary hypoplasia. Images FIG. 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 6 FIG. 7 FIG. 8 FIG. 9 FIG. 10 FIG. 11 PMID:962365

  8. The evolution of surgery at the New York Hospital.

    PubMed Central

    Leitman, I. M.

    1991-01-01

    Surgery evolved from colonial times through many innovations and developments. During this time it was transformed from a dangerous practice to a delicate and scientific art. Many of these early developments continue to be a part of modern surgical therapy. Although European discoveries have had a profound effect on this evolution, American advances solidified the link between the laboratory and the operating room. The New York Hospital-Cornell Medical Center, like other medical centers around the country, made important contributions to this evolution. Because the hospital has spanned American history, it also has paralleled surgical development in the United States. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 PMID:1933072

  9. Clinical presentations of Ehlers Danlos syndrome type IV.

    PubMed Central

    Pope, F M; Narcisi, P; Nicholls, A C; Liberman, M; Oorthuys, J W

    1988-01-01

    Ehlers Danlos syndrome type IV is an often lethal disease caused by various mutations of type III collagen genes. It presents in infancy and childhood in several ways, and the symptoms and signs include low birth weight, prematurity, congenital dislocation of the hips, easy inappropriate bruising (sometimes suspected as child battering), and a diagnostic facial phenotype. These features predict a lethal adult disease often complicated by fatal arterial rupture in early or middle adult life. Most affected patients can be diagnosed from radiolabelled collagen protein profiles by polyacrylamide gel electrophoresis. Prenatal diagnosis by specific type III collagen restriction fragment length polymorphisms is possible in some families, and will become increasingly important. Prenatal diagnosis and prevention of the disease in selected families is already possible and will be widely available in the future. Images Fig 1 Fig 2 Fig 3 Fig 4 Fig 5 Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 PMID:3178263

  10. The Reflexes of the Fundus Oculi

    PubMed Central

    Ballantyne, A. J.

    1940-01-01

    fragmented” surface reflexes, or as evidence of the presence of some highly refractile substance, such as cholesterin or calcium carbonate, in a retinal exudate or other lesion. It is characteristic of the pathological reflexes that they come and go and change their character according to the progress of the pathological condition. The linear reflexes in particular may change from one from to another, and may be finally transformed into surface reflexes of physiological character. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10Fig. 11Fig. 12Fig. 13Fig. 14Fig. 15Fig. 16Fig. 17Fig. 18Fig. 19Fig. 20Fig. 21Fig. 22Fig. 23Fig. 24Fig. 25Fig. 26 PMID:19992307

  11. Cryo-electron microscopy of vitrified SV40 minichromosomes: the liquid drop model.

    PubMed Central

    Dubochet, J; Adrian, M; Schultz, P; Oudet, P

    1986-01-01

    The structure of SV40 minichromosomes has been studied by cryo-electron microscopy of vitrified thin layers of solution. In high-salt buffer (130 mM NaCl), freshly prepared minichromosomes are condensed into globules 30 nm or more in diameter. On the micrograph, they appear to be formed by the close packing of 10 nm granules which give rise to a 10 nm reflection in the optical diffractogram. The globules can adopt many different conformations. At high concentration, they fuse into a homogeneous 'sea' of closely packed 10 nm granules. In low-salt buffer (less than 10 mM NaCl), the globules open, first into 10 nm filaments, and then into nucleosome-strings. The 'liquid drop' model is proposed to explain the condensed structure of the minichromosome in high-salt buffer: nucleosomes stack specifically on top of one another, thus forming the 10 nm filaments. 10 nm filaments in turn, tend to aggregate laterally. Optimizing both these interactions results in the condensation of 10 nm filaments or portions thereof into a structure similar to that of a liquid. Some implications of this model for the structure of cellular chromatin are discussed. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 6. Fig. 7. Fig. 8. Fig. 9. Fig. 11. Fig. 13. Fig. 14. PMID:3011410

  12. The interaction of antigen and antibody in agglutination

    PubMed Central

    Elek, S. D.; Smith, B. V. Kingsley; Highman, Wilma

    1964-01-01

    Flagellar fragments are thin cylinders that are particularly suitable for the study of agglutination by electron microscopy. Their shape leads to a characteristic pattern of agglutination and thus the early stages can be studied. Measurement of interflagellar distances under conditions of negative staining, suggest that the minimum length of the rabbit antibody molecules is about 180 Å. The molecules carry the specific sites at the ends of the long axis, and become attached radially to the surface of the flagella, resembling the bristles of a bottle-brush. To explain this orientation it is postulated that the antibody is inserted into the surface of the flagellum in such a manner that surrounding molecules give it a fixed direction. Geometrically this hypothesis corresponds to an insertion into pits. Pepsin-treated (5S) rabbit antibody behaves in a like manner, but the molecule appears to be shorter. No information could be obtained about the thickness and actual shape of antibody molecules by the techniques employed. ImagesFIG. 1FIG. 2FIG. 3FIG. 4FIG. 5FIG. 6FIG. 9FIG. 11FIG. 13FIG. 14FIG. 15 PMID:14210767

  13. Shape and motion from image streams: a factorization method.

    PubMed Central

    Tomasi, C; Kanade, T

    1993-01-01

    Inferring scene geometry and camera motion from a stream of images is possible in principle, but it is an ill-conditioned problem when the objects are distant with respect to their size. We have developed a factorization method that can overcome this difficulty by recovering shape and motion without computing depth as an intermediate step. An image stream can be represented by the 2F x P measurement matrix of the image coordinates of P points tracked through F frames. Under orthographic projection this matrix is of rank 3. Using this observation, the factorization method uses the singular value decomposition technique to factor the measurement matrix into two matrices, which represent object shape and camera motion, respectively. The method can also handle and obtain a full solution from a partially filled-in measurement matrix, which occurs when features appear and disappear in the image sequence due to occlusions or tracking failures. The method gives accurate results and does not introduce smoothing in either shape or motion. We demonstrate this with a series of experiments on laboratory and outdoor image streams, with and without occlusions. Images Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 11 Fig. 12 PMID:11607434

  14. Encrustation and Atherosclerosis: The Analogy Between Early in Vivo Lesions and Deposits Which Occur in Extracorporeal Circulations

    PubMed Central

    Murphy, E. A.; Rowsell, H. C.; Downie, H. G.; Robinson, G. A.; Mustard, J. F.

    1962-01-01

    A study was made of the relation between the pattern and topography of thrombus formation in models of various vessel configurations coupled into extracorporeal shunts in swine and the development of atherosclerosis at corresponding sites on swine aortas. The pattern and distribution of deposits formed in the models were strikingly similar to the pattern and distribution of incipient atherosclerosis at comparable sites in the vascular tree. The earliest and only consistent component of the flow chamber deposits was the blood platelet. The platelet deposits would frequently stain with oil red O. The cholesterol level of washed human platelets was found to show a good correlation with that in the plasma. This evidence suggests that deposition of particulate matter (chiefly platelets), largely determined by the hydraulic factors, may be an important factor in the early, as well as later, stages of atherosclerosis. ImagesFigs. 10a and bFig. 13Fig. 21Fig. 1Fig. 3Figs. 4a and bFig. 5Fig. 6aFig. 6bFig. 7Fig. 8Fig. 9Fig. 11Fig. 12Fig. 14Fig. 15Fig. 16Fig. 17Fig. 18Fig. 19Fig. 20 PMID:14477412

  15. Tumours of the kidney

    PubMed Central

    Nielsen, Svend W.; Mackey, L. J.; Misdorp, W.

    1976-01-01

    The most frequent renal tumours of animals are renal cell carcinoma and nephroblastoma. Renal cell carcinomas are seen mainly in dogs and cattle and nephroblastoma is encountered in pigs, puppies, and calves. Renal cell carcinomas are usually papillary in the dog. They show a marked propensity for vascular invasion, penetration of the posterior vena cava, and subsequent pulmonary metastasis. Nephroblastoma, which is morphologically identical to Wilms' tumour of children, is almost always a benign tumour in animals. It is one of the most frequent neoplasms of pigs, possibly owing to the fact that most pigs are slaughtered (and examined) when a few months old. Lymphosarcoma involving the kidney is particularly frequent in the cat, but is also seen in other species as part of a generalized disease. ImagesFig. 5,6Fig. 7Fig. 8Fig. 1,2Fig. 3,4Fig. 16,17,18,19Fig. 9,10Fig. 11Fig. 12Fig. 13Fig. 14,15 PMID:1086154

  16. The Nature of D-Serine-Induced Nephrotoxicity

    PubMed Central

    Ganote, Charles E.; Peterson, Darryl R.; Carone, Frank A.

    1974-01-01

    Renal structural changes were studied sequentially between 1 hour and 6 days in rats treated with D-serine. Extensive necrosis of proximal straight tubules was rapid in onset and was followed by complete tubular regeneration 6 days post-treatment. The apparent progression of cellular changes was initial shrinkage, followed either by swelling and loss of apical cytoplasm or immediate lysis of cytoplasmic and nuclear contents. Tubular damage left only the basement membrane as a barrier between interstitial and luminal fluids. In similarly treated rats, proteinuria and glucosuria developed at the onset of tubular necrosis and disappeared when the tubules were completely relined by epithelium suggesting that they are due to diffusion of protein and glucose from interstitium into tubular fluid across the denuded basement membranes and that epithelial cells, under normal conditions, act as a barrier to diffusion of certain substances between the interstitium and tubular fluid. ImagesFig 10Fig 11Fig 1Fig 2Fig 3Fig 12Fig 13Fig 14Fig 15Fig 4Fig 5Fig 6Fig 7Fig 8Fig 9 PMID:4447130

  17. Remodelling of bone and bones: growth of normal and transplanted caudal vertebrae.

    PubMed Central

    Feik, S A; Storey, E

    1983-01-01

    Changes in the rate of growth, shape and structure of the 8th, 16th and 22nd caudal vertebrae of 4 and 24-27 days old Sprague-Dawley rats were studied in situ and in three different non-functional transplantation sites for 12 weeks. With increasing size, maturity and age the three vertebrae showed progressively decreasing growth, changes in shape and structural abnormalities. The smallest anlages grew faster and matured sooner than normal, so that their length equalled that of controls. Central endochondral necrosis in older bones was associated with decreased longitudinal growth but in some younger ones, despite a perforation of the cartilage and herniation of the nucleus pulposus into the marrow cavity of the shaft, growth proceeded at near normal rates. The free ends of older, larger transplants grew faster than the abutting ends joined by joint connective tissue, indicating that central necrosis of cartilage resulted from impaired nutrient diffusion. The results suggest that the cartilage model may possess an inherent capacity to produce a certain limited amount of bone tissue which may be distributed either in the form of long and thin or short and inwaisted bones, depending on the balance of forces between interstitial cartilage expansion and the restraining ensheathing periosteal-perichondrial tissues. This basic form may be modified further by functional forces. Images Fig. 2 Fig. 4 Fig. 6 Fig. 7 Fig. 8 Fig. 10 Fig. 11 Fig. 12 Fig. 9 PMID:6339456

  18. Histopathological changes in the epithelial cells of rat duodenum following chronic dietary exposure to cadmium, with particular reference to Paneth cells.

    PubMed Central

    Phillpotts, C. J.

    1986-01-01

    Male and female rats 8 weeks old were exposed for 360 days to a sole source of drinking water containing 0.2 g/l cadmium as the chloride salt. Control rats were exposed for the same period to deionized water. At 90, 180, 270 and 360 day intervals a proportion of the rats from both test and control groups were killed and the duodenums removed. The histopathology was assessed by both light and electron microscopy. In cadmium treated rats the duodenums were enlarged and there was a significant reduction in the percentage of crypts containing Paneth cells. Remaining Paneth cells appeared vacuolated. By both light and electron microscopy changes were noted in the epithelial cells covering the villus tips. These were swollen and protruded towards the duodenal lumen to give a 'cobblestone' appearance by scanning electron microscopy. It is suggested that these histopathological appearances will be seen in chronic dietary exposure to cadmium. Images Fig. 1 Fig. 2 Fig. 9 Fig. 10 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 3 Fig. 8 PMID:3741776

  19. Procurement and Maintenance of Germ-Free Swine for Microbiological Investigations1

    PubMed Central

    Meyer, R. C.; Bohl, E. H.; Kohler, E. M.

    1964-01-01

    Germ-free swine were routinely procured by both hysterectomy and hysterotomy (Caesarian section). By means of light-weight portable equipment, piglets could be obtained and transported to the laboratory (without contamination) over distances in excess of 100 miles. The isolators employed in rearing were constructed of stainless steel and flexible plastic film. At weekly intervals, fecal swabs and waste from the floor of the isolator were cultured on blood-agar and in thioglycolate broth, as well as being examined microscopically for the presence of bacteria, yeast, and fungi. The presence of pleuropneumonia-like organisms (PPLO) and viruses in such material was not demonstrable, either by the use of enriched PPLO media or primary porcine-kidney cell cultures. Tissues, body fluids, and cecal contents of piglets sacrificed specifically for microbiological examination were also negative for PPLO, viruses, bacteria, yeast, and fungi. Prenatal infestations by ascarids were not observed. Nutritional problems related to rearing of germ-free piglets, such as hypoglycemia, were not encountered, and the use of an autoclaved commercial sow's milk replacer proved quite satisfactory. The temperature to which piglets were subjected during the first few days of life, however, was very important. The isolator design and application of gnotobiotic techniques to the procurement and rearing of a large germ-free animal such as the pig proved feasible and less difficult than anticipated. Images FIG. 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 7 FIG. 8 FIG. 9 FIG. 10 FIG. 11 PMID:14199016

  20. Pathology of Bolivian Hemorrhagic Fever in the Rhesus Monkey

    PubMed Central

    Terrell, Timothy G.; Stookey, James L.; Eddy, Gerald A.; Kastello, Michael D.

    1973-01-01

    Gross and microscopic lesions associated with Bolivan hemorrhagic fever virus infection in the rhesus monkey were studied in 10 animals which died following inoculation. Gross lesions included skin rash, lymphadenopathy, splenomegaly, meningeal edema, hydropericardium and enlarged friable livers. Hemorrhagic manifestations of the infection were not consistently observed, but hemorrhages were present in the skin, heart, brain and nares in some monkeys. Histopathologic lesions were fairly consistent. Hepatic necrosis with the presence of acidophilic hyaline bodies, necrotizing enteritis, epithelial necrosis and adrenal cortical necrosis were present in all monkeys. Those monkeys which died after the seventeenth day of infection had nonsupurative meningoencephalitis; lymphoid necrosis was present in 3 monkeys that died after day 18. Other microscopic lesions included myocardial degeneration, lymphoid and reticuloendothelial cell hyperplasia and lymphoid depletion. Most of the histopathologic lesions described in human autopsy material were reproduced; however, the necrosis in the skin and oral mucosa, mucosa of the gastrointestinal tract and the adrenal cortex have not been described in man. Despite these apparent discrepancies the results of this investigation indicate that the rhesus monkey is a good experimental model for the study of Bolivian hemorrhagic fever infection. ImagesFig 12Fig 13Fig 1Fig 2Fig 3Fig 4Fig 5Fig 6Fig 7Fig 8Fig 9Fig 10Fig 11 PMID:4202335

  1. Variations in structure and function during the life cycle of malarial parasites*

    PubMed Central

    Aikawa, M.

    1977-01-01

    The fine structure of malarial parasites is reviewed and the function of the intracellular organelles is discussed. When the erythrocytic, exoerythrocytic, and mosquito stages of plasmodia are compared, substantial differences are seen. The major differences involve the amount of surface coat of the motile forms, the structure and function of the mitochondria, and the ingestion and digestion of nutrients. Significant structural differences are also observed between comparable stages of mammalian and avian parasites. These differences indicate that malarial parasites adapt themselves to the different environments in which the parasite resides. When host cell changes induced by malarial parasite infection are reviewed, alterations characteristic of the infecting plasmodia are observed in erythrocytes. Erythrocyte changes include caveola—vesicle complexes, excrescences, and clefts. The caveola—vesicle complexes possess malarial antigens and exhibit pinocytotic activities. The excrescences form focal junctions with adjacent cells and may be responsible for infected erythrocyte sequestration in organs. The significance of these host cell changes specific to certain species of malarial parasite is still unknown. ImagesFig. 9Fig. 8Fig. 2Fig. 6Fig. 3Fig. 1Fig. 7Fig. 4Fig. 10Fig. 5 PMID:338177

  2. Mycotoxic nephropathy in pigs*

    PubMed Central

    Elling, F.; Møller, T.

    1973-01-01

    In Denmark a nephropathy in pigs characterized by tubular atrophy and interstitial fibrosis has been identified frequently during the last 5 decades in the course of meat inspection in slaughterhouses. The disease was first described by Larsen, who recognized the connexion between feeding mouldy rye to pigs and the development of the nephropathy. In this study kidneys were examined from 19 pigs coming from a farm with an outbreak of nephropathy. The barley fed to the pigs was contaminated with the mycotoxin ochratoxin A. Histological examination revealed different degrees of change ranging from slight regressive changes in the tubular epithelium and periglomerular and interstitial fibrosis to tubular atrophy, thickened basement membranes, glomerular sclerosis, and marked fibrosis. These differences were considered to be due to differences in the length of time of exposure to the mouldy barley and differences in the amount of mycotoxin consumed by the individual pig. However, it will be necessary to carry out experiments using crystalline ochratoxin A in order to prove such a relationship. Mycotoxins have also been suggested as etiological factors in Balkan nephropathy in man, which in the initial stages is characterized by tubular lesions similar to those seen in mycotoxic nephropathy in pigs. ImagesFig. 1Fig. 2Fig. 7Fig. 8Fig. 9Fig. 3Fig. 4Fig. 5Fig. 6Fig. 10Fig. 11 PMID:4546872

  3. The Treatment of the Incompletely Descended Testis

    PubMed Central

    Wilson, D. S. Poole

    1939-01-01

    (1) Under three years of age the diagnosis of the incompletely descended testis is uncertain. (2) The policy of awaiting spontaneous descent may be pursued until 10 years of age but, unless the testis lies in the superior scrotal position, this policy should not be persisted in thereafter. (3) Hormonal therapy may be employed before operative treatment as a means of determining testes which will descend spontaneously. It should only be used in the prepuberty period. (4) Operative treatment may be safely carried out at any age after 3 years and should be completed before puberty. The optimum period is between 8 and 11 years. The Bevan operation may be successful when the testis is very mobile but the most consistent results are obtained by the septal transposition or Keetley-Torek operations. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 8Fig. 9Fig. 10Fig. 13Fig. 14Fig. 15Fig. 16Fig. 18Fig. 19Fig. 20Fig. 21Fig. 22 PMID:19991991

  4. Intranuclear inclusions in Schwann cells of aged fowl ciliary ganglia.

    PubMed Central

    Fiori, M G

    1987-01-01

    Schwann cells in ciliary ganglia of fowls aged five to seven years were found to contain numerous intranuclear inclusions and pseudo-inclusions. Similar inclusions were usually absent from both neurons and non-neuronal cells, including connective tissue cells, and were rare in Schwann cells of chickens aged less than five years. Inclusions were of two different types: filamentous bundles and granulofibrillar bodies. Individual nuclei contained one to three inclusions. Pseudo-inclusions, i.e. cytoplasmic pockets invaginated into the nuclei, were found more rarely and accompanied one or both types of 'true' inclusions. The possible significance of these findings in relation to ageing phenomena is discussed. It is concluded that intranuclear inclusions appear to be a consequence of nuclear/cellular activation and may be regarded as aggregates of previously dispersed intranuclear proteins. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Figs. 11-12 Fig. 13 Figs. 14-19 PMID:2833482

  5. Animal models of primary myocardial diseases.

    PubMed Central

    Liu, S. K.; Tilley, L. P.

    1980-01-01

    Feline and canine cardiomyopathies (primary myocardial diseases) were reviewed and divided into three groups based on the clinical, hemodynamic, angiocardiographic, and pathologic findings: (1) feline and canine hypertrophic cardiomyopathy, (2) feline and canine congestive (dilated) cardiomyopathy, and (3) feline restrictive cardiomyopathy. All three groups consisted predominantly of mature adult male cats and dogs. Cardiomyopathy in the hamster and turkey was also reviewed. The most common presenting signs were dyspnea and/or thromboembolism in the cat, systolic murmurs with gallop rhythms on auscultation, cardiomegaly with (groups 1 and 3) or without (group 2) pulmonary edema, abnormal electrocardiograms, elevated left ventricular end-diastolic pressures, and angiocardiographic evidence of mitral regurgitation with left ventricular concentric hypertrophy (group 1), left ventricular dilatation (group 2), or midventricular stenosis (group 3). Some cats in groups 1 and 3 also had evidence of left ventricular outflow obstruction. The principal pathologic findings in all of the cats and dogs were left atrial dilation, hypertrophy, increased septal:left ventricular free wall thickness ratio with disorganization of cardiac muscle cells (group 1); dilatation of the four chambers with degeneration of cardiac muscle cells (group 2); and extensive endocardial fibrosis and adhesion of the left ventricle (group 3). Aortic thromboembolism was commonly observed in the cats of all three groups. These clinical and pathologic findings indicate that cardiomyopathy in the cat or dog is similar to the three forms of cardiomyopathy in humans (hypertrophic, congestive, and restrictive). Images FIG. 2 FIG. 3 FIG. 5 FIG. 6 FIG. 7 FIG. 8 FIG. 9 FIG. 11 FIG. 12 FIG. 13 FIG. 15 FIG. 16 FIG. 17 FIG. 20 FIG. 21 FIG. 22 FIG. 24 FIG. 25 PMID:6447412

  6. Respiratory movements and rapid eye movement sleep in the foetal lamb

    PubMed Central

    Dawes, G. S.; Fox, H. E.; Leduc, B. M.; Liggins, G. C.; Richards, R. T.

    1972-01-01

    1. In foetal lambs from 40 days gestation (0·27 of term) onwards delivered into a warm saline bath, apparently spontaneous breathing movements were present intermittently. They became deeper and more rapid with increasing age. 2. In foetal lambs (from 0·66 of term) in which observations were made for many days after chronic implantation of tracheal, carotid and amniotic catheters, rapid irregular respiratory movements were present up to 40% of the time, and brief gasps also were seen. 3. The presence of these movements was unrelated to the foetal carotid blood gas values over a wide range of spontaneous variation. 4. These foetal breathing movements were accompanied by comparatively small alterations of pulmonary volume recorded from a tracheal flowmeter, insufficient to clear the tracheal dead space. Occasionally a more prolonged expiration led to the outward flow of fluid. 5. A description is given of sleep and wakefulness in foetal lambs from 0·78 of term. 6. Rapid irregular breathing was associated with rapid eye movement sleep as seen in a warm saline bath or, in utero, as inferred from records of eye movements and electrocortical activity. 7. Respiratory movements were often associated with relatively large variations in foetal heart rate, blood pressure and descending aortic blood flow. 8. Rapid irregular foetal breathing was unaffected by section or blockade of the cervical vagi, but was abolished by general anaesthesia. 9. It is concluded that respiratory movements are normally but intermittently present in the foetal lamb over the greater part of gestation. ImagesFig. 2Fig. 4Fig. 8Fig. 10Fig. 11Fig. 13 PMID:4333826

  7. Surgical management of Menetrier's disease with protein-losing gastropathy.

    PubMed Central

    Scott, H W; Shull, H J; Law, D H; Burko, H; Page, D L

    1975-01-01

    Three patients with Menetrier's disease and protein-losing gastropathy who were studied during a 12 year period have been presented. The characteristic findings which differentiate them from patients with hypertrophic hypersecretory gastropathy, including the Zollinger-Ellison syndrome, are: 1) hypertrophy of gastric mucosa with giant rugal folds involving the fundus, cardia and body of the stomach but sparing the antrum; 2) muscosal hypertrophy consisting of gastric mjcus-secreting cells while parietal cells and chief cells are diminished in number and may be absent from many microscopic sections; 3) gastric secretion of large volume containing excess mucus, low to absent hydrochloric acid and protein concentration 5 or 6 times normal (1.7 mg/ml); 4) hypoalbuminemia and hypoglobulinemia due to loss of serum proteins fron gastric mucosa into the gastric lumen; 5) rare association with gastric ulcer. Unlike the Zollinger-Ellison syndrome none of our patients had duodenal ucler or multiple endocrine adenomatosis or a family history of these conditions. We have found no authenticated reports in the literature which document a relationship of Menetrier's disease ( as defined above) with multiple endocrine adenomatosis. Menetrier's disease with protein-losing gastropathy is a potentially lethal disorder of unknown cause with no specific treatment. Resection of the site of gastric protein losses as first done by Waugh is logical and effective. One of our three patients died in hospital before gastrectomy was done. Two others have done well for 11 months and 12 years, respectively, after total gastrectomy with Roux-en-Y esophagojejunostomy and Hunt-Lawrence jejunal pouch. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6A. Fig. 6B. Fig. 7. Fig. 8A. Fig. 8B. Fig. 9A. Fig. 9B. Fig. 10. Fig. 11. Fig. 12. Fig. 13. Fig. 14. Fig. 15. Fig. 16. PMID:1130890

  8. Remodelling of bone and bones: effects of translation and strain on transplants.

    PubMed Central

    Pollard, A. W.; Feik, S. A.; Storey, E.

    1984-01-01

    Tail segments, from 4-day-old Sprague-Dawley rats, consisting of caudal vertebrae (CV) approximately 7-9 were impaled on 0.23-mm diameter Elgiloy wire and transplanted subcutaneously into 50-70 g male hosts to study the effects on transplants of (a) impaling (b) strain and (c) translation. The CV were impaled onto straight lengths of wire to serve as controls (a); onto a wire curved to form a loop and exert a bending force (b) and onto the arms of a spring which moved bones through the surrounding tissues, i.e. translation (c). Tissue changes were studied up to 28 days by radiographic and histological techniques. Control bones grow relatively normally along the straight wire. The CV subjected to strain bend initially and then grow in an arc along the curve of the wire. The outer bone shaft usually becomes straighter while the inner one becomes concave and rarefied. In the translated bones remodelling occurs in a direction generally opposite to the direction of movement but this is modified by the influence of soft tissue tension and pressure. Bone resorbs on the outer leading side under continuous pressure and forms on the inner trailing side under continuous tension. The process is essentially the same as that seen in 'cortical drift'; however, since translation is rapid there is an alteration in the shape of the translated bones as formation on the trailing side is faster than resorption on the leading side.(ABSTRACT TRUNCATED AT 250 WORDS) Images Fig. 4 Fig. 5 Fig. 3 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 PMID:6388616

  9. The Harderian gland, its secretory duct and porphyrin content in the mongolian gerbil (Meriones unguiculatus).

    PubMed Central

    Johnston, H S; McGadey, J; Thompson, G G; Moore, M R; Payne, A P

    1983-01-01

    The Harderian gland, its secretory duct and porphyrin content were examined in the mongolian gerbil (Meriones unguiculatus). The gland consisted of tubules lined by a single layer of epithelial cells and a myoepithelial network. The tubule cells were often binucleate and possessed lipid vacuoles in the apical half of the cell, a corona of granular endoplasmic reticulum surrounding the nucleus, and cytoplasmic 'slashes'. The latter are probably derived from dense membranous couplets and may be precursors of the lipid vacuoles. Holocrine and merocrine secretion was observed. Interstitial cells included plasma cells, mast cells and (predominantly) melanocytes which render the gland black. The gland was surrounded by a collagen capsule and an outer layer of highly attenuated (possibly endothelioid) cells. Within the gland, the secretory duct was lined by a single layer of normal tubule cells. Outside the gland, the duct enlarged to form an ampulla, from which clefts led off to deep crypts. The ampulla and clefts were lined by cells with small dense apical granules and stubby microvilli; some possessed lipid vacuoles. The crypts were lined by serous cells with active Golgi regions. At the duct opening, ampullary cells became squamous and goblet cells occurred. Geometric crystalloid deposits (with a layered structure of 7.6 nm periodicity) occurred at cleft-crypt junctions. Islets of extra-glandular ductal tissue were occasionally found within the gland. Porphyrins were detectable both by chemical assay and fluorescence microscopy. There was a trend for female glands to have a higher content than males. Solid intraluminal accretions of porphyrin and/or lipid were present. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 12 Fig. 13 Fig. 14 Fig. 15 Fig. 16 PMID:6654750

  10. An Investigation of Methods of Isolation of β2M1 Globulin (Syn.: Iota Protein, 19S γ Globulin, γ1 Macroglobulin, β2M Globulin) and its Association with Isoagglutinin Activity, together with Preliminary Observations on Other Macroglobulins of Slow Electrophoretic Mobility in Normal Human Serum

    PubMed Central

    Walton, K. W.; Rowe, D. S.; Soothill, J. F.; Stanworth, D. R.

    1963-01-01

    demonstrable in ultracentrifugal concentrates of normal serum. Evidence is presented to suggest that these proteins are nevertheless present as trace components of normal serum. The solubility and electrophoretic characteristics of these proteins resemble those of β2M1 globulin, but they can be distinguished by immunological methods from β2M1 globulin and each other. Attention is drawn to the evidence that β2M2 and β2M3 globulins may also be increased in the serum of some cases of macroglobulinaemia. ImagesFIG. 1FIG. 2FIG. 7FIG. 10FIG. 11FIG. 12FIG. 13

  11. Chemical Debridement of Burns

    PubMed Central

    Levenson, Stanley M.; Kan, Dorinne; Gruber, Charles; Crowley, Leo V.; Lent, Richard; Watford, Alvin; Seifter, Eli

    1974-01-01

    contaminated types. ImagesFigs. 1a-c.Fig. 1b.Fig. 1c.Fig. 2.Fig. 3.Fig. 4.Fig. 5.Fig. 6.Fig. 7.Fig. 8.Fig. 9a.Fig. 9B.Fig. 10.Fig. 11.Figs. 12a-c.Fig. 12b.Fig. 12c.Figs. 14a-c.Fig. 14b.Fig. 14c.Figs. 15a-c.Fig. 15b.Fig. 15c. PMID:4606330

  12. Effect of conduction block at axon bifurcations on synaptic transmission to different postsynaptic neurones in the leech.

    PubMed Central

    Gu, X N

    1991-01-01

    , contacts with the AP cell, while anterior branches had few, if any, contacts upon the AE cell. 6. Conduction block can thus act as a switch in the central nervous system (CNS), altering the mP cell's pattern of synaptic transmission to different postsynaptic neurons depending upon the region of a single sensory neurone's receptive field that is stimulated. This effect, dependent upon inputs to a single neurone, may be expected to influence the performance of the system and its outputs. Images Fig. 2 Fig. 9 Fig. 10 Fig. 11 PMID:1667806

  13. Characterization of new polyclonal antibodies specific for 40 and 42 amino acid-long amyloid beta peptides: their use to examine the cell biology of presenilins and the immunohistochemistry of sporadic Alzheimer's disease and cerebral amyloid angiopathy cases.

    PubMed Central

    Barelli, H.; Lebeau, A.; Vizzavona, J.; Delaere, P.; Chevallier, N.; Drouot, C.; Marambaud, P.; Ancolio, K.; Buxbaum, J. D.; Khorkova, O.; Heroux, J.; Sahasrabudhe, S.; Martinez, J.; Warter, J. M.; Mohr, M.; Checler, F.

    1997-01-01

    demonstrated that FAD-linked presenilins similarly affect both p342 and A beta 42, suggesting that these mutations misroute the beta APP to a compartment where gamma-secretase, but not alpha-secretase, cleavages are modified. Overall, these antibodies should prove useful for fundamental and diagnostic approaches, as suggested by their usefulness for biochemical, cell biological, and immunohistochemical techniques. Images FIG. 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 7 FIG. 8 FIG. 9 FIG. 10 FIG. 11 PMID:9392006

  14. Supercollider physics

    SciTech Connect

    Quigg, C.

    1985-03-01

    The physics that can be explored with multi-TeV supercolliders is reviewed, including parton distributions, hadron jet production, the standard electroweak theory and minimal extensions to it, technicolor, supersymmetry, and compositeness. 19 refs., 11 figs. (LEW)

  15. Fundamental principles of particle detectors

    SciTech Connect

    Fernow, R.C.

    1988-01-01

    This paper goes through the fundamental physics of particles-matter interactions which is necessary for the detection of these particles with detectors. A listing of 41 concepts and detector principles are given. 14 refs., 11 figs.

  16. Cosmic relics from the big bang

    SciTech Connect

    Hall, L.J.

    1988-12-01

    A brief introduction to the big bang picture of the early universe is given. Dark matter is discussed; particularly its implications for elementary particle physics. A classification scheme for dark matter relics is given. 21 refs., 11 figs., 1 tab.

  17. Recent QCD results from the Tevatron

    SciTech Connect

    Pickarz, Henryk; CDF and DO collaboration

    1997-02-01

    Recent QCD results from the CDF and D0 detectors at the Tevatron proton-antiproton collider are presented. An outlook for future QCD tests at the Tevatron collider is also breifly discussed. 27 refs., 11 figs.

  18. The ORNL whole body counter

    SciTech Connect

    Not Available

    1988-01-01

    This report is a non-technical document intended to provide an individual about to undergo a whole-body radiation count with a general understanding of the counting procedure and with the results obtained. 9 figs. (TEM)

  19. Production of virus resistant plants

    DOEpatents

    Dougherty, W.G.; Lindbo, J.A.

    1996-12-10

    A method of suppressing virus gene expression in plants using untranslatable plus sense RNA is disclosed. The method is useful for the production of plants that are resistant to virus infection. 9 figs.

  20. Mixed-mu superconducting bearings

    DOEpatents

    Hull, J.R.; Mulcahy, T.M.

    1998-03-03

    A mixed-mu superconducting bearing is disclosed including a ferrite structure disposed for rotation adjacent a stationary superconductor material structure and a stationary permanent magnet structure. The ferrite structure is levitated by said stationary permanent magnet structure. 9 figs.

  1. Experiments in the application of ultrasound diffraction tomography for nondestructive testing

    SciTech Connect

    Azevedo, S.G.; Fitch, J.P.

    1988-07-01

    We have designed computer programs to simulate ultrasound projection scans and to reconstruct the tomographic planar image. We have also used the reconstruction algorithm on actual test data and have obtained a crude but promising image. 11 refs., 9 figs.

  2. A novel visual facial anxiety scale for assessing preoperative anxiety

    PubMed Central

    Cao, Xuezhao; Yumul, Roya; Elvir Lazo, Ofelia Loani; Friedman, Jeremy; Durra, Omar; Zhang, Xiao; White, Paul F.

    2017-01-01

    Background There is currently no widely accepted instrument for measuring preoperative anxiety. The objective of this study was to develop a simple visual facial anxiety scale (VFAS) for assessing acute preoperative anxiety. Methods The initial VFAS was comprised of 11 similarly styled stick-figure reflecting different types of facial expressions (Fig 1). After obtaining IRB approval, a total of 265 participant-healthcare providers (e.g., anesthesiologists, anesthesiology residents, and perioperative nurses) were recruited to participate in this study. The participants were asked to: (1) rank the 11 faces from 0–10 (0 = no anxiety, while 10 = highest anxiety) and then to (2) match one of the 11 facial expression with a numeric verbal rating scale (NVRS) (0 = no anxiety and 10 = highest level of anxiety) and a specific categorical level of anxiety, namely no anxiety, mild, mild-moderate, moderate, moderate-high or highest anxiety. Based on these data, the Spearman correlation and frequencies of the 11 faces in relation to the 11-point numerical anxiety scale and 6 categorical anxiety levels were calculated. The highest frequency of a face assigned to a level of the numerical anxiety scale resulted in a finalized order of faces corresponding to the 11-point numeric rating scale. Results The highest frequency for each of the NVRS anxiety scores were as follow: A0, A1, A2, A3, A4, A5, A7, A6, A8, A9 and A10 (Fig 2). For the six categorical anxiety levels, a total of 260 (98.1%) participants chose the face A0 as representing ‘no’ anxiety, 250 (94.3%) participants chose the face A10 as representing ‘highest’ anxiety and 147 (55.5%) participants chose the face A8 as representing ‘moderate-high’ anxiety. Spearman analysis showed a significant correlation between the faces A3 and A5 assigned to the mild-moderate anxiety category (r = 0.58), but A5 was ultimately chosen due to its higher frequency compared to the frequency of A3 (30.6% vs 24.9%)(Fig 3

  3. Phosphonic acid based exchange resins

    DOEpatents

    Horwitz, E.P.; Alexandratos, S.D.; Gatrone, R.C.; Chiarizia, R.

    1995-09-12

    An ion exchange resin is described for extracting metal ions from a liquid waste stream. An ion exchange resin is prepared by copolymerizing a vinylidene diphosphonic acid with styrene, acrylonitrile and divinylbenzene. 10 figs.

  4. CP violation in K decays

    SciTech Connect

    Gilman, F.J.

    1989-05-01

    Recent theoretical and experimental progress on the manifestation of CP violation in K decays, and toward understanding whether CP violation originates in a phase, or phases, in the weak mixing matrix of quarks is reviewed. 23 refs., 10 figs.

  5. Quarterly oil report

    SciTech Connect

    Not Available

    1990-07-01

    This report contains information on petroleum fuels market activity in California. Included is information on price trends, refinery activities, production, and petroleum company financial statements. 10 fig., 6 tabs. (CBS)

  6. Heavy quark results at D0

    SciTech Connect

    Fein, D.K.; D0 Collaboration

    1997-01-01

    Recent results in heavy quark physics from the D0 experiment at the Fermilab Tevatron Collider are reported. Topics included are top quark production and mass determination, bottom production and correlations, and charmonium production. 20 refs., 10 figs., 2 tabs.

  7. AC-130H Gunship Armor Upgrade Project

    SciTech Connect

    Shell, T.E.; Landingham, R.L.

    1990-09-19

    This report covers the test methods and equipment for testing aircraft armor both hard and soft. The hard armor are the typical ceramic type while the soft armor are various types of layered composite materials. 10 figs. (JEF)

  8. A PROLOG registry of experts

    SciTech Connect

    Ferrada, J.J.; Mashburn, S.A.; Rodgers, B.R.

    1988-01-01

    This paper discusses the use of Prolog in the construction of a user-friendly registry of consultants. This data base provides access by name, expertise, organization, or state. Also discussed are the features of this language which make it adaptable for this purpose. 3 refs., 11 figs. (LSP)

  9. Hydrogen production by photoprocesses

    SciTech Connect

    Bull, S.R.

    1988-10-01

    The concept of producing hydrogen fuel from sunlight is inherently appealing and has captured the imagination of many scientists, innovators, and decision makers. In fact, there are numerous routes to produce hydrogen from solar energy through photoprocesses. Generally, they can be grouped into four processes: electric conversion, thermal conversion, indirect conversion, and direct photon conversion. 12 refs., 11 figs.

  10. Transport simulations of ohmic pellet experiments on the TFTR, ASDEX, and ALCATOR-C tokamaks

    SciTech Connect

    Redi, M.H.; Tang, W.M.; Owens, D.K.; Greenwald, M.; Gruber, O.; Kaufmann, M.

    1988-07-01

    Transport simulations of ohmic gas-fuelled and pellet-fuelled experiments have been carried out to test a microinstability-based, profile-consistent model of anomalous transport in tokamaks. Predictions for experiments on the TFTR, ASDEX, and ALCATOR-C tokamaks were found consistent with the observed confinement and temperature measurements. 26 refs., 11 figs., 10 tabs.

  11. Neutron spectroscopy on TFTR (Tokamak Fusion Test Reactor)

    SciTech Connect

    Nishitani, T.; Strachan, J.D.

    1988-05-01

    This paper describes the use of an /sup 3/He ionization chamber for neutron spectroscopy on TFTR during 1987. The ion temperature was measured using neutron spectroscopy for one set of ohmically heated plasmas. The deduced ion temperatures agreed to within 20% with those measured by other diagnostics. 11 refs., 11 figs., 1 tab.

  12. Structures having enhanced biaxial texture and method of fabricating same

    DOEpatents

    Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

    1998-04-21

    A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

  13. Structures having enhanced biaxial texture and method of fabricating same

    DOEpatents

    Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

    1998-04-14

    A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

  14. Creep resistant, metal-coated LiFeO[sub 2] anodes for molten carbonated fuel cells

    DOEpatents

    Khandkar, A.C.

    1994-08-23

    A porous, creep-resistant, metal-coated, LiFeO[sub 2] ceramic electrode for fuel cells is disclosed. The electrode is particularly useful for molten carbonate fuel cells (MCFC) although it may have utilities in solid oxide fuel cells (SOFC) as well. 11 figs.

  15. Introduction to conformal field theory and string theory

    SciTech Connect

    Dixon, L.J.

    1989-12-01

    These lectures are meant to provide a brief introduction to conformal field theory (CFT) and string theory for those with no prior exposure to the subjects. There are many excellent reviews already available, and most of these go in to much more detail than I will be able to here. 52 refs., 11 figs.

  16. Method of chemical vapor deposition of boron nitride using polymeric cyanoborane

    DOEpatents

    Maya, L.

    1994-06-14

    Polymeric cyanoborane is volatilized, decomposed by thermal or microwave plasma energy, and deposited on a substrate as an amorphous film containing boron, nitrogen and carbon. Residual carbon present in the film is removed by ammonia treatment at an increased temperature, producing an adherent, essentially stoichiometric boron nitride film. 11 figs.

  17. A review of the Los Alamos effort in the development of nuclear rocket propulsion

    SciTech Connect

    Durham, F.P.; Kirk, W.L.; Bohl, R.J.

    1991-01-01

    This paper reviews the achievements of the Los Alamos nuclear rocket propulsion program and describes some specific reactor design and testing problems encountered during the development program along with the progress made in solving these problems. The relevance of these problems to a renewed nuclear thermal rocket development program for the Space Exploration Initiative (SEI) is discussed. 11 figs.

  18. Calculating coherent pair production with Monte Carlo methods

    SciTech Connect

    Bottcher, C.; Strayer, M.R.

    1989-01-01

    We discuss calculations of the coherent electromagnetic pair production in ultra-relativistic hadron collisions. This type of production, in lowest order, is obtained from three diagrams which contain two virtual photons. We discuss simple Monte Carlo methods for evaluating these classes of diagrams without recourse to involved algebraic reduction schemes. 19 refs., 11 figs.

  19. High average power induction accelerators

    SciTech Connect

    Swingle, J.C.

    1985-10-01

    The induction accelerator is discussed with respect to general background and concept, beam transport, scaling, pulse power technology, and the electron beam injector. A discussion of the factors which affect the scaling of the intensity of the beam is given. Limiting factors include collective forces in the beam, virtual cathode formation, surroundings, and beam breakup instability. 24 refs., 11 figs. (WRF)

  20. Current responsive devices for synchronous generators

    DOEpatents

    Karlicek, R.F.

    1983-09-27

    A device for detecting current imbalance between phases of a polyphase alternating current generator. A detector responds to the maximum peak current in the generator, and detecting means generates an output for each phase proportional to the peak current of each phase. Comparing means generates an output when the maximum peak current exceeds the phase peak current. 11 figs.

  1. Erythropoietin binding protein from mammalian serum

    DOEpatents

    Clemons, G.K.

    1997-04-29

    Purified mammalian erythropoietin binding-protein is disclosed, and its isolation, identification, characterization, purification, and immunoassay are described. The erythropoietin binding protein can be used for regulation of erythropoiesis by regulating levels and half-life of erythropoietin. A diagnostic kit for determination of level of erythropoietin binding protein is also described. 11 figs.

  2. Binary and ternary gas mixtures with temperature enhanced diffuse glow discharge characteristics for use in closing switches

    DOEpatents

    Christophorou, L.G.; Hunter, S.R.

    1988-06-28

    An improvement to the gas mixture used in diffuse glow discharge closing switches is disclosed which includes binary and ternary gas mixtures which are formulated to exhibit decreasing electron attachment with increasing temperature. This increases the efficiency of the conductance of the glow discharge and further inhibits the formation of an arc. 11 figs.

  3. Binary and ternary gas mixtures with temperature enhanced diffuse glow discharge characteristics for use in closing switches

    DOEpatents

    Christophorou, L.G.; Hunter, S.R.

    1990-06-26

    An improvement to the gas mixture used in diffuse glow discharge closing switches is disclosed which includes binary and ternary gas mixtures which are formulated to exhibit decreasing electron attachment with increasing temperature. This increases the efficiency of the conductance of the glow discharge and further inhibits the formation of an arc. 11 figs.

  4. Macromolecular coal structure as revealed by novel diffusion tests: Quarterly technical progress report, September 15, 1988--January 15, 1989

    SciTech Connect

    Peppas, N.A.

    1989-01-01

    New experimental studies are reported of diffusion in thin sections of various coal samples. Data are presented of the transport of acetone, cyclohexane, methanol, methyl ethyl ketone, toluene and methylene chloride in coals PSOC 418, 853 and 384. These results are compared to swelling of some of these solvents in crosslinked poly(methyl methacrylate). 2 refs., 11 figs., 1 tab.

  5. Searching for the Higgs in ep collisions at LEP/LHC

    SciTech Connect

    Grindhammer, G. ); Haidt, D. , Hamburg ); Ohnemus, J. ); Vermaseren, J. , Amsterdam . Sectie H); Zeppenfeld, D.

    1990-11-01

    We investigate the possibility to observe an intermediate mass Higgs in ep collisions at LEP/LHC. We find that such a particle can be observed once a reasonable level of flavor identification is available to separate efficiently the b{bar b} decay mode of the Higgs from most of the background. 18 refs., 11 figs., 7 tabs.

  6. DOE grant for assessment of district cooling system for University of Arkansas for Medical Sciences, Little Rock, Arkansas

    SciTech Connect

    Timmerman, R.W. and Associates, Boston, MA ); Broer, W.T.F. and Associates, Boston, MA )

    1990-01-01

    The object of this study which covers the assessment of the District Cooling Plant for the University of Arkansas for Medical Sciences (UAMS) Campus, was to study potential ways to use the newest technology in District Cooling and Methodology to optimize the efficiency of this plant. 11 figs.

  7. North Alabama water quality assessment

    SciTech Connect

    Pullin, B.P.

    1988-03-01

    The purpose of this report is to summarize previously existing information on the abundance and distribution of green-backed herons on selected areas of Wilson and Pickwick Reservoirs, present the results of the 1987 survey, and make recommendations regarding further investigations. 6 refs., 11 figs., 5 tabs.

  8. Composite hydrogen separation element and module

    DOEpatents

    Edlund, D.J.; Newbold, D.D.; Frost, C.B.

    1997-07-08

    There are disclosed improvements in multicomponent composite metal membranes useful for the separation of hydrogen, the improvements comprising the provision of at least one common-axis hole through all components of the composite membrane and the provision of a gas-tight seal around the periphery of the hole or holes through a coating metal layer of the membrane. 11 figs.

  9. Electromagnetic energy applied to and gained from lunar materials

    SciTech Connect

    Meek, T.T.; Vaniman, D.T.; Blake, R.D.; Cocks, F.H.

    1986-01-01

    Electromagnetic energy may be useful in microwave frequencies for in-situ melting or sintering of lunar regolith. Simple configurations of magnetron or gyrotron tubes might be constructed for unique melting geometries. For energy production, lunar ilmenite has potential applications in photovoltaic devices. 11 refs., 11 figs.

  10. Monolithic amplifier with stable, high resistance feedback element and method for fabricating the same

    DOEpatents

    O`Connor, P.

    1998-08-11

    A monolithic amplifier includes a stable, high resistance feedback circuit and a dynamic bias circuit. The dynamic bias circuit is formed with active elements matched to those in the amplifier and feedback circuit to compensate for variations in the operating and threshold voltages thereby maintaining a stable resistance in the feedback circuit. 11 figs.

  11. Wide Band to ''Double Band'' upgrade

    SciTech Connect

    Kasper, P.; Currier, R.; Garbincius, P.; Butler, J.

    1988-06-01

    The Wide Band beam currently uses electrons obtained from secondary photon conversions to produce the photon beam incident on the experimental targets. By transporting the positrons produced in these conversions as well as the electrons it is possible to almost double the number of photons delivered to the experiments per primary beam proton. 11 figs.

  12. Molecular sieving silica membrane fabrication process

    DOEpatents

    Raman, N.K.; Brinker, C.J.

    1999-08-10

    A process is described for producing a molecular sieve silica membrane comprising depositing a hybrid organic-inorganic polymer comprising at least one organic constituent and at least one inorganic constituent on a porous substrate material and removing at least a portion of the at least one organic constituent of the hybrid organic-inorganic polymer, forming a porous film. 11 figs.

  13. Optical system for high resolution spectrometer/monochromator

    DOEpatents

    Hettrick, M.C.; Underwood, J.H.

    1988-10-11

    An optical system for use in a spectrometer or monochromator employing a mirror which reflects electromagnetic radiation from a source to converge with same in a plane is disclosed. A straight grooved, varied-spaced diffraction grating receives the converging electromagnetic radiation from the mirror and produces a spectral image for capture by a detector, target or like receiver. 11 figs.

  14. Structures having enhanced biaxial texture and method of fabricating same

    DOEpatents

    Goyal, A.; Budai, J.D.; Kroeger, D.M.; Norton, D.P.; Specht, E.D.; Christen, D.K.

    1999-04-27

    A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon. 11 figs.

  15. Stellarator status, 1989

    SciTech Connect

    Lyon, J.F. ); Grieger, G.; Rau, F. ); Iiyoshi, A. ); Navarro, A.P. ); Kovrizhnykh, L.M. . Inst. Obshchey Fiziki); Pavlichenko, O.S. (AN Ukrain

    1990-07-01

    The present status of stellarator experiments and recent progress in stellarator research (both experimental and theoretical) are reported by groups in the United States, the USSR, Japan, Australia, and the European Community (the Federal Republic of Germany and Spain). Experiments under construction and studies of large, next-generation stellarators are also described. 73 refs., 11 figs., 4 tabs.

  16. Low Illumination Light (LIL) Solar Cells: Indoor and Monochromatic Light Harvesting

    DTIC Science & Technology

    2015-11-01

    device.29 .................................................................................................9 Fig. 9 A plot of a typical dark current...overview of PVs used in this study with STC characteristics and some material properties that include dark level parameters ...............15 Table 2...current that flows even when no photons are absorbed into the device, which is called dark or reverse bias leakage depending on type of field (I0 or Is

  17. Method for fabricating silicon cells

    DOEpatents

    Ruby, D.S.; Basore, P.A.; Schubert, W.K.

    1998-08-11

    A process is described for making high-efficiency solar cells. This is accomplished by forming a diffusion junction and a passivating oxide layer in a single high-temperature process step. The invention includes the class of solar cells made using this process, including high-efficiency solar cells made using Czochralski-grown silicon. 9 figs.

  18. Permanent laser conditioning of thin film optical materials

    DOEpatents

    Wolfe, C.R.; Kozlowski, M.R.; Campbell, J.H.; Staggs, M.; Rainer, F.

    1995-12-05

    The invention comprises a method for producing optical thin films with a high laser damage threshold and the resulting thin films. The laser damage threshold of the thin films is permanently increased by irradiating the thin films with a fluence below an unconditioned laser damage threshold. 9 figs.

  19. Method for imaging liquid and dielectric materials with scanning polarization force microscopy

    DOEpatents

    Hu, J.; Ogletree, D.F.; Salmeron, M.; Xiao, X.

    1999-03-09

    The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged. 9 figs.

  20. Apparatus for imaging liquid and dielectric materials with scanning polarization force microscopy

    DOEpatents

    Hu, J.; Ogletree, D.F.; Salmeron, M.; Xiao, X.

    1998-04-28

    The invention images dielectric polarization forces on surfaces induced by a charged scanning force microscope (SFM) probe tip. On insulators, the major contribution to the surface polarizability at low frequencies is from surface ions. The mobility of these ions depends strongly on the humidity. Using the inventive SFM, liquid films, droplets, and other weakly adsorbed materials have been imaged. 9 figs.

  1. Overview of the ATF (Advanced Toroidal Facility) Program

    SciTech Connect

    Lyon, J.F.; Bigelow, T.S.; Carreras, B.A.; Carter, M.D.; Colchin, R.J.; Crume, E.C.; Dominguez, N.; Dunlap, J.L.; Dyer, G.R.; England, A.C.; Glowienka, J.C.; Goulding, R.H.; Halliwell, J.W.; Harris, J.H.; Hillis, D.L.; Hiroe, S.; Horton, L.D.; Howe, H.C.; Hutchinson, D.P.; Isler, R.C.; Jernigan, T.C.; Kindsfather, R.R.; Langley, R.A.; Leboeuf, J.N.; Ma, C.H.; Menon, M.M.; Meyer, F.W.; Mioduszewski, P.K.; Murakami, M.; Neilso

    1989-01-01

    Initial operation of ATF showed narrow pressure profiles and second stability behavior at lower beta than expected and revealed uncompensated dipoles in the HF winding leads that have since been corrected. Energy confinement times obtained with neutral beam injection and electron cyclotron heating roughly follow the LHD scaling. However, a plasma collapse is observed with NBI 6 refs., 9 figs.

  2. Emission cross sections and energy extraction for the mid-infrared transitions of Er, Tm, and Ho in oxide and fluoride crystals

    SciTech Connect

    Chase, L.L.; Payne, S.A.; Smith, L.K.; Kway, W.L.; Krupke, W.F.

    1991-04-01

    Emission cross sections have been measured for the transitions between the two lowest spin orbit multiplets of Er, Tm, and Ho in several fluoride and oxide crystals. Properties affecting energy extraction efficiency are summarized and pulsed extraction performance is calculated for several of these quasi-three-level laser media. 4 refs., 9 figs.

  3. Method of making an InAsSb/InAsSbP diode lasers

    DOEpatents

    Razeghi, M.

    1997-08-19

    InAsSb/InAsSbP/InAs Double Heterostructures (DH) and Separate Confinement Heterostructure Multiple Quantum Well (SCH-MQW) structures are taught wherein the ability to tune to a specific wavelength within 3 {micro}m to 5 {micro}m is possible by varying the ratio of As:Sb in the active layer. 9 figs.

  4. Fluidization quality analyzer for fluidized beds

    DOEpatents

    Daw, C.S.; Hawk, J.A.

    1995-07-25

    A control loop and fluidization quality analyzer for a fluidized bed utilizes time varying pressure drop measurements. A fast-response pressure transducer measures the overall bed pressure drop, or over some segment of the bed, and the pressure drop signal is processed to produce an output voltage which changes with the degree of fluidization turbulence. 9 figs.

  5. A multitechnique characterization of the acidity of dealuminated mazzite

    SciTech Connect

    McQueen, D. |; Fitoussi, F.; Schulz, P.

    1996-07-01

    The authors endeavored to characterize the acidity of stream-dealuminated mazzite through various techniques. Isomerization of n-paraffin over the platinum/mazzite catalyst indicated higher activity and selectivity than that of commercial platinum/mordenite. 44 refs., 9 figs., 7 tabs.

  6. Cartilage hair hypoplasia.

    PubMed Central

    Siggers, D. C.; Burke, J. B.; Morris, B.; Normand, I. C.; Tanner, J. M.; Williamson, D. A.

    1977-01-01

    Six cases of cartilage hair hypoplasia from five kindreds are described. They demonstrate variation in the expression of clinical features such as sparsity of hair, hair calibre, radiological changes, short stature and the extent of the disproportion between sitting height and stature. Images Figs. 1-6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 PMID:917962

  7. Guidelines for generators of hazardous chemical waste at LBL and Guidelines for generators of radioactive and mixed waste at LBL

    SciTech Connect

    Not Available

    1991-07-01

    The purpose of this document is to provide the acceptance criteria for the transfer of hazardous chemical, radioactive, and mixed waste to Lawrence Berkeley Laboratory's (LBL) Hazardous Waste Handling Facility (HWHF). These guidelines describe how a generator of wastes can meet LBL's acceptance criteria for hazardous chemical, radioactive, and mixed waste. 9 figs.

  8. Method and apparatus for transmutation of atomic nuclei

    DOEpatents

    Maenchen, J.E.; Ruiz, C.L.

    1998-06-09

    Insuring a constant supply of radioisotopes is of great importance to medicine and industry. This invention addresses this problem, and helps to solve it by introducing a new apparatus for transmutation of isotopes which enables swift and flexible production on demand. 9 figs.

  9. Method and apparatus for transmutation of atomic nuclei

    DOEpatents

    Maenchen, J.E.; Ruiz, C.L.

    1998-12-08

    Insuring a constant supply of radioisotopes is of great importance to medicine and industry. This invention addresses this problem, and helps to solve it by introducing a new apparatus for transmutation of isotopes which enables swift and flexible production on demand. 9 figs.

  10. LEB tuner made out of titanium alloy

    SciTech Connect

    Goren, Y.; Campbell, B.

    1991-09-01

    A proposed design of a closed shell tuner for the LEB cavity is presented. The tuner is made out of Ti alloy which has a high electrical resistivity as well as very good mechanical strength. Using this alloy results in a substantial reduction in the eddy current heating as well as allowing for faster frequency control. 9 figs.

  11. Preliminary review of mass transfer and flow visualization studies and techniques relevant to the study of erosion-corrosion of reactor piping systems

    SciTech Connect

    Kuzay, T.M.; Halle, H.J.; Kasza, K.E.

    1988-06-01

    This report provides some background information on the failed piping at the Surry-2 reactor; a summary of pertinent literature on mass transfer in related geometries; and a description of methodologies for visualization and erosion rate measurements in laboratory model studies that can provide greater insight into the role of flow geometry in erosion-corrosion. 18 refs., 9 figs., 1 tab.

  12. Personnel and Vehicle Data Collection at Aberdeen Proving Ground (APG) and its Distribution for Research

    DTIC Science & Technology

    2015-10-01

    5 Fig. 5 Day 3 walker’s diamond pattern ............................................................6 Fig. 6 Day 3...walker’s double wedge pattern ....................................................8 Fig. 10 Day 3 walker’s diamond in front and 2 men behind pattern...8 Fig. 11 Day 3 walker’s point man slack man pattern .........................................9 Fig. 12 Day 3 walker’s diamond

  13. Permanent magnet design for high-speed superconducting bearings

    DOEpatents

    Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

    1996-09-10

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

  14. Acoustic transducer for acoustic microscopy

    DOEpatents

    Khuri-Yakub, B.T.; Chou, C.H.

    1990-03-20

    A shear acoustic transducer-lens system is described in which a shear polarized piezoelectric material excites shear polarized waves at one end of a buffer rod having a lens at the other end which excites longitudinal waves in a coupling medium by mode conversion at selected locations on the lens. 9 figs.

  15. Filter holder and gasket assembly for candle or tube filters

    DOEpatents

    Lippert, T.E.; Alvin, M.A.; Bruck, G.J.; Smeltzer, E.E.

    1999-03-02

    A filter holder and gasket assembly are disclosed for holding a candle filter element within a hot gas cleanup system pressure vessel. The filter holder and gasket assembly includes a filter housing, an annular spacer ring securely attached within the filter housing, a gasket sock, a top gasket, a middle gasket and a cast nut. 9 figs.

  16. Acridine-intercalator based hypoxia selective cytotoxins

    DOEpatents

    Papadopoulou-Rosenzweig, M.; Bloomer, W.D.

    1994-03-15

    Hypoxia selective cytotoxins of the general formula STR1 wherein n is from 1 to 5, and NO[sub 2] is in at least one of the 2, 4 or 5-positions of the imidazole are developed. Such compounds have utility as radiosensitizers and chemosensitizers. 9 figs.

  17. Experimental verification of physical model of pulsed laser welding

    SciTech Connect

    Jellison, J.L.; Keicher, D.M.

    1990-01-01

    Whereas most experimental and theoretical studies of the role of convection in fusion welding have been concerned with continuous heat sources, a pulsed heat source is the focus of this study. This is primarily an experimental study of the pulsed Nd:YAG laser welding of austenitic stainless steels. 12 refs., 9 figs.

  18. Electron beam welding of 6061-T6 covers to A356-T6 machined cast housings: Final report

    SciTech Connect

    Miller, G.P.

    1988-03-01

    An electron beam welding process was developed to replace the manual gas tungsten arc welding process for welding 6061-T6 aluminum covers to the A356-T6 cast aluminum machined housing for a Filter Pack Assembly. Design change recommendations must be incorporated prior to implementation of the electron beam welding process. 3 refs., 9 figs., 5 tabs.

  19. Target-specific binding of immunoliposomes in vivo

    SciTech Connect

    Holmberg, E.; Maruyama, K.; Kennel, S.; Klibanov, A.; Torchilin, V.; Ryan, U.; Huang, L.

    1989-01-01

    Our group at the University of Tennessee has been concentrating on using monoclonal antibody for targeting of a liposomal drug carrier system. This paper discusses our initial effort to target these liposomes using an organ-specific monoclonal antibody. 9 refs., 9 figs.

  20. Spontaneous fission properties and lifetime systematics

    SciTech Connect

    Hoffman, D.C.

    1989-03-01

    Half-lives for spontaneous fission of nuclides with even and odd numbers of particles are compared with recent theoretical calculations. A summary of odd particle hindrance factors is given. The most recent measurements of kinetic-energy and mass distributions and neutron emission for spontaneous fission of the heaviest nuclides are summarized and discussed. 51 refs., 9 figs.

  1. Directed flow fluid rinse trough

    DOEpatents

    Kempka, S.N.; Walters, R.N.

    1996-07-02

    Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs. 9 figs.

  2. Solid oxide fuel cell with single material for electrodes and interconnect

    DOEpatents

    McPheeters, C.C.; Nelson, P.A.; Dees, D.W.

    1994-07-19

    A solid oxide fuel cell is described having a plurality of individual cells. A solid oxide fuel cell has an anode and a cathode with electrolyte disposed there between, and the anode, cathode and interconnect elements are comprised of substantially one material. 9 figs.

  3. Super high energy heavy ion collisions

    SciTech Connect

    Geist, W.M.

    1987-12-01

    Basic theoretical ideas on a phase transition to a plasma of free quarks and gluons in heavy ion collisions are outlined. First results from experiments with oxygen beams at 14.5 GeV/c/N (BNL), 60 and 200 GeV/c/N (CERN) are discussed. 30 refs., 9 figs.

  4. Impulse radar studfinder

    DOEpatents

    McEwan, T.E.

    1995-10-10

    An impulse radar studfinder propagates electromagnetic pulses and detects reflected pulses from a fixed range. Unmodulated pulses, about 200 ps wide, are emitted. A large number of reflected pulses are sampled and averaged. Background reflections are subtracted. Reflections from wall studs or other hidden objects are detected and displayed using light emitting diodes. 9 figs.

  5. High conductivity electrolyte solutions and rechargeable cells incorporating such solutions

    DOEpatents

    Angell, C.A.; Zhang, S.S.; Xu, K.

    1998-10-20

    This invention relates generally to electrolyte solvents for use in liquid or rubbery polymer electrolyte solutions as are used, for example, in electrochemical devices. More specifically, this invention relates to sulfonyl/phospho-compound electrolyte solvents and sulfonyl/phospho-compound electrolyte solutions incorporating such solvents. 9 figs.

  6. Compact fluorescent lamp using horizontal and vertical insulating septums and convective venting geometry

    DOEpatents

    Siminovitch, M.

    1998-02-10

    A novel design is described for a compact fluorescent lamp, including a lamp geometry which will increase light output and efficacy of the lamp in a base down operating position by providing horizontal and vertical insulating septums positioned in the ballast compartment of the lamp to provide a cooler coldspot. Selective convective venting provides additional cooling of the ballast compartment. 9 figs.

  7. Centrifugal Spray Generator of Singlet Oxygen for a COIL

    DTIC Science & Technology

    2010-07-23

    mixing tank 1. Liquid is transferred after cooling down to about -28 C into the BHP input tank 2 through isolated stainless steel piping. Pressure ...in this tank is increased to 180-220 kPa (abs.) by means of pressurized nitrogen just before the generator operation. The BHP liquid is then led by...11 Fig. 8. Overall view on the laser from the right side 1 – BHP mixing tank , 2 – pressurized BHP tank , 3 – atomizing nozzle, 4

  8. High temperature materials technology research for advanced thermionic systems. Quarterly progress report for period ending September 30, 1993

    SciTech Connect

    Zee, R.H.; Rose, M.F.

    1993-12-31

    Objective was to understand the strengthening mechanisms in advanced refractory alloys for high-temperature thermionic applications. During the first 6 months, the role of substitutional solutes in refractory alloy single crystals was identified and modeled using a simple size misfit factor as the governing parameter. During the past period, effort was concentrated on the strengthening effects in various refractory structures and the growth of refractory alloy single crystals. 11 figs, 4 tabs.

  9. Multiple-channel, total-reflection optic with controllable divergence

    DOEpatents

    Gibson, D.M.; Downing, R.G.

    1997-02-18

    An apparatus and method for providing focused x-ray, gamma-ray, charged particle and neutral particle, including neutron, radiation beams with a controllable amount of divergence are disclosed. The apparatus features a novel use of a radiation blocking structure, which, when combined with multiple-channel total reflection optics, increases the versatility of the optics by providing user-controlled output-beam divergence. 11 figs.

  10. High current density pulsed cathode experiments at SLAC

    SciTech Connect

    Koontz, R.; Fant, K.; Vlieks, A.

    1990-06-01

    A 1.9 microperveance beam diode has been constructed to test high current density cathodes for use in klystrons. Several standard and specially coated dispenser cathodes are being tested. Results of tests to date show average cathode current densities in excess of 25 amps/cm, and maximum electric field gradients of more than 450 kV/cm for pulses of the order of 1{mu}sec. 3 refs., 11 figs.

  11. Comparison of two-dimensional and three-dimensional MHD equilibrium and stability codes

    SciTech Connect

    Herrnegger, F.; Merkel, P.; Johnson, J.L.

    1986-02-01

    Stability results obtained with the fully three-dimensional magnetohydrodynamic code BETA, the helically invariant code HERA, and the asymptotic stellarator expansion code STEP agree well for a straight l = 2, M = 5 stellarator model. This good agreement between the BETA and STEP codes persists as toroidal curvature is introduced. This validation provides justification for confidence in work with these models. 20 refs., 11 figs.

  12. Top coal caving longwall maximizes thick seam recovery

    SciTech Connect

    Duncan, G.; Sobey,. G.; Clarke, T.

    2007-07-15

    Austar's longwall system offers opportunities in coal seams thicker than 4.5 meters. The Longwall Top Coal Caving (LTCC) method was recently launched in Australia at Yancoal Australia's Austar mines in Hunter Valley, although 90 such longwalls already operate in China. The article describes the method and its installation at Austar. In September 2006 the LTCC face commenced production. The operation is described and measures to prevent spontaneous combustion are outlined. Future work on the longwall is mentioned. 11 figs.

  13. Sensor capabilities for the HERMIES experimental robot

    SciTech Connect

    Killough, S.M.; Hamel, W.R.

    1988-01-01

    The Center for Engineering Systems Advanced Research at the Oak Ridge National Laboratory has developed an experimental robot, the HERMIES, to test artificial intelligence concepts. This paper describes the capabilities provided for navigation and control. The authors conclude that the sensor suite, which enables the robot to recognize, locate, and grasp objects, makes HERMIES IIB a powerful tool for robotics and artificial intelligence research. 7 refs., 11 figs.

  14. Quantum Information Processing with Trapped 43Ca+ Ions

    DTIC Science & Technology

    2008-03-18

    state 11 Fig.3: Deterministic quantum teleportation protocol 12 Fig.4: Density matrix of an entangled eight-ion state 13 Fig.5: Quantum process...4.3.4 Deterministic quantum teleportation Teleportation of a quantum state encompasses the complete transfer of information from one particle to...allow quantum -state teleportation to be performed. We succeeded in demonstrating deterministic quantum -state teleportation between a pair of trapped

  15. Probing the vacuum with highly charged ions

    SciTech Connect

    Bottcher, C.; Strayer, M.R.

    1987-01-01

    The physics of the Fermion vacuum is briefly described, and applied to pair production in heavy ion collisions. We consider in turn low energies (<50 MeV/nucleon), intermediate energies (<5 GeV/nucleon), and ultrahigh energies such as would be produced in a ring collider. At high energies, interesting questions of Lorentz and gauge invariance arise. Finally, some applications to the structure of high Z atoms are examined. 14 refs., 11 figs.

  16. Kinetic theory of the Farley-Buneman instability in the E region of the ionosphere

    SciTech Connect

    Dimant, Y.S.; Sudan, R.N.

    1995-08-01

    The Farley-Buneman instability in the ionospheric E region is studied. Restrictions under which the Farley-Buneman dispersion relation is derived are presented, along with the physical nature of the instability. A mathematical model based on a kinetic approach is given. The long wave limit of the instability is discussed as well as a brief review of the general case of arbitrary wavelengths. 38 refs. 11 figs.

  17. Method and apparatus for measuring lung density by Compton backscattering

    DOEpatents

    Loo, B.W.; Goulding, F.S.

    1988-03-11

    The density of the lung of a patient suffering from pulmonary edema is monitored by irradiating the lung by a single collimated beam of monochromatic photons and measuring the energies of photons compton back-scattered from the lung by a single high-resolution, high-purity germanium detector. A compact system geometry and a unique data extraction scheme are utilized to minimize systematic errors due to the presence of the chestwall and multiple scattering. 11 figs., 1 tab.

  18. Quark flavor mixing, CP violation, and all that

    SciTech Connect

    Gilman, F.J.

    1988-04-01

    We review the present state of knowledge of the mixing of quark flavors under weak interactions and the associated explanation of CP violation inherent in the single nontrivial phase present in the three-generation mixing matrix. In this context we present the phenomenological basis for the increasing possibility that large CP violation asymmetries can be experimentally observed in the B meson system. 39 refs., 11 figs.,

  19. Interferometric ring lasers and optical devices

    DOEpatents

    Hohimer, J.P.; Craft, D.C.

    1995-03-14

    Two ring diode lasers are optically coupled together to produce tunable, stable output through a Y-junction output coupler which may also be a laser diode or can be an active waveguide. These devices demonstrate a sharp peak in light output with an excellent side-mode-rejection ratio. The rings can also be made of passive or active waveguide material. With additional rings the device is a tunable optical multiplexer/demultiplexer. 11 figs.

  20. Frequency regulator for synchronous generators

    DOEpatents

    Karlicek, R.F.

    1982-08-10

    The present invention is directed to a novel frequency regulator which controls a generator output frequency for variations in both the input power to the generator and the power supplied to an uncontrolled external load. The present invention further includes over current and current balance protection devices which are relatively inexpensive to manufacture, which may be encapsulated to provide protection from the operating environment and which respond more quickly than previously known electromechanical devices. 11 figs.

  1. Wind energy: A review of technical and market issues

    SciTech Connect

    Garrad, A.D.

    1996-12-31

    Opinions on the world market for wind power are presented in this paper. The paper is divided into three sections: the market, the technology, and general conclusions. The market section compares European and US wind energy growth and contributing factors and barriers to growth. A technology overview discusses wind turbine concepts, mass reduction, blade structural flexibility, and growth in machine size. Political decisions, economic aspects, public acceptance, and technology limitations are assessed for their influence on the growth of wind energy. 11 figs.

  2. Neuroendocrine Differentiation in Prostate Cancer: Role of Bone Morphogenetic Protein-6 and Macrophages

    DTIC Science & Technology

    2010-07-01

    7-10-2010 11 Fig 6. When RAW 264.7 cells were treated with SB203580 and BMP-6, ChIP assay using GATA4 antibody no longer amplified...neuroendocrine differentiation was no longer observed. Mechanistically, series of studies including shRNA knockdowns and immunoprecipitation assays have...et al., 2005). These mice express the human diphtheria toxin receptor (DTR) under the control of cd11b, a macrophage-specific promoter. Because the

  3. Simulated liquid water and visibility in stratiform boundary-layer clouds over sloping terrain

    SciTech Connect

    Tjernstroem, M. )

    1993-04-01

    The amount of liquid water in stratus clouds or fog is discussed from the point of view of estimating visibility variations in areas with complex terrain. The average vertical profile of liquid water from numerical simulations with a higher-order closure mesoscale model is examined, and runs with the model for moderately complex terrain are utilized to estimate the of low-level liquid water content variability and thus, indirectly, the variations in horizontal visibility along a slope. 37 refs., 11 figs.

  4. Solderability test system

    DOEpatents

    Yost, F.; Hosking, F.M.; Jellison, J.L.; Short, B.; Giversen, T.; Reed, J.R.

    1998-10-27

    A new test method to quantify capillary flow solderability on a printed wiring board surface finish. The test is based on solder flow from a pad onto narrow strips or lines. A test procedure and video image analysis technique were developed for conducting the test and evaluating the data. Feasibility tests revealed that the wetted distance was sensitive to the ratio of pad radius to line width (l/r), solder volume, and flux predry time. 11 figs.

  5. Micropole undulator

    DOEpatents

    Tatchyn, R.O.; Csonka, P.L.; Cremer, J.T.

    1990-12-11

    Micropole undulators for use in the generation of x-rays from moving charged particles are disclosed. Two rows of spaced apart poles are arranged so that each pole produces a magnetic field aligned with all other similar fields. The poles are the ends of C''-shaped magnets. In each row, adjacent poles are separated by spacers made of a superconducting material. 11 figs.

  6. A balloon-borne aerosol spectrometer for high altitude low aerosol concentration measurements

    SciTech Connect

    Brown, G.S. ); Weiss, R.E. )

    1990-08-01

    Funded by Air Force Wright Aeronautical Laboratory, a new balloon-borne high altitude aerosol spectrometer, for the measurement of cirrus cloud ice crystals, has been developed and successfully flown by Sandia National Laboratories and Radiance Research. This report (1) details the aerosol spectrometer design and construction, (2) discusses data transmission and decoding, (3) presents data collected on three Florida flights in tables and plots. 2 refs., 11 figs., 3 tabs.

  7. Flight Behavior of an Asymmetric Body through Spark Range Experiments Using Roll-Yaw Resonance for Yaw Enhancement

    DTIC Science & Technology

    2015-07-01

    asymmetric mass was placed within the body. This internal asymmetry creates a trim moment and angle of attack that is amplified during free -flight as...attack amplitude in this manner enables analysis of a rich set of flight behaviors. Free -flight experiments were conducted on this flight body in the...8 Fig. 6 Shadowgraph of model during free -flight experiment .........................11 Fig. 7 Angular motion for TRN39362

  8. Electron injection in semiconductor drift detectors

    SciTech Connect

    Rehak, P. ); Gatti, E.; Longoni, A.; Sampietro, M.; Castoldi, A. ); Vacchi, A. )

    1990-01-01

    The paper reports the first successful results of a simple MOS structure to inject electrons at a given position in Silicon Drift Detectors. The structure allows on-line calibration of the drift velocity of electrons within the detector. The calibration is a practical method to trace the temperature dependence of the electron mobility. Several of these injection structures can be implemented in silicon drift detectors without additional steps in the fabrication process. 5 refs., 11 figs.

  9. Series interconnected photovoltaic cells and method for making same

    DOEpatents

    Albright, S.P.; Chamberlin, R.R.; Thompson, R.A.

    1995-01-31

    A novel photovoltaic module and method for constructing the same are disclosed. The module includes a plurality of photovoltaic cells formed on a substrate and laterally separated by interconnection regions. Each cell includes a bottom electrode, a photoactive layer and a top electrode layer. Adjacent cells are connected in electrical series by way of a conductive-buffer line. The buffer line is also useful in protecting the bottom electrode against severing during downstream layer cutting processes. 11 figs.

  10. Microwave sintering of alumina-SiC composites at 2. 45 and 60 GHz

    SciTech Connect

    Katz, J.D.; Blake, R.D.; Petrovic, J.J.

    1988-01-01

    Composites of alumina-10 vol % silicon carbide whiskers were sintered to 70% of theoretical density using both 2.45 and 60 GHz microwave radiation. Further densification was inhibited by formation of a constrained network of whiskers. Alumina-10 vol % silicon carbide platelet composites were sintered to 94% of theoretical density with 2.45 GHz microwaves in less than 20 minutes. 4 refs., 11 figs.

  11. Concepts in strong Langmuir turbulence theory

    SciTech Connect

    DuBois, D.F.; Rose, H.A.

    1990-01-01

    Some of the basic concepts of strong Langmuir turbulence (SLT) theory are reviewed. In SLT system, a major fraction of the turbulent energy is carried by local, time-dependent, nonlinear excitations called cavitons. Modulational instability, localization of Langmuir fields by density fluctuations, caviton nucleation, collapse, and burnout and caviton correlations are reviewed. Recent experimental evidence will be presented for SLT phenomena in the interaction of powerful HF waves with the ionosphere and in laser-plasma interaction experiments. 38 refs., 11 figs.

  12. Electromagnetic fields in axial symmetric waveguides with variable cross section

    SciTech Connect

    Kheifets, S.

    1980-02-15

    A new class of separable variables is found which allows one to find an approximate analytical solution of the Maxwell equations for axial symmetric waveguides with slow (but not necessarily small) varying boundary surfaces. An example of the solution is given. Possible applications and limitations of this approach are discussed. 6 refs., 10 figs.

  13. A Low Velocity 0.30-cal. Gun System

    DTIC Science & Technology

    2015-02-01

    Chronograph velocity screens Shockwave arresting shield Shotline Panel Fixture 8” 12” 12” 105” 20” 26.5” X-ray film planes side and orthogonal X-ray heads...35-inch)-long test barrel. Test barrel Shockwave shield 10 Fig. 12 0.30-cal. FSP launch velocity as a function of propellant load

  14. Air Force Project Competition

    DTIC Science & Technology

    2014-10-22

    cylinder . FA9550-11-1-0235 final report The Johns Hopkins University Dr Nathan Scott 10 Fig. 11 Aric Rousso demonstrates the custom pump. Fig. 10...designing and implementing an inner liner for their otherwise strong multi- layer Kevlar™ bag system. They learned the hard way that the rubber inner

  15. Air Force Project Competition

    DTIC Science & Technology

    2014-10-17

    cylinder . FA9550-11-1-0235 final report The Johns Hopkins University Dr Nathan Scott 10 Fig. 11 Aric Rousso demonstrates the custom pump. Fig. 10...designing and implementing an inner liner for their otherwise strong multi- layer Kevlar™ bag system. They learned the hard way that the rubber inner

  16. LEP and CEBAF polarimeters: Revision

    SciTech Connect

    Burkert, V.; Rossmanith, R.; Placidi, M.

    1988-01-01

    This paper gives an overview on high energy electron (positron) polarimeters by describing in more detail the plans for the LEP polarimeter and the CEBAF polarimeters. Both LEP and CEBAF will have laser polarimeters. In addition CEBAF will be equipped with a M/o/ller polarimeter (for currents below 1..mu..A). 4 refs., 10 figs.

  17. Production dynamics and high p/sub T/ spin effects

    SciTech Connect

    Soffer, J.

    1988-08-01

    We will emphasize the importance of spin for our understanding of production dynamics at high p/sub T/. Within the framework of perturbative QCD several predictions for interesting spin observables are presented for various reactions. They are crucial tests accessible to existing or future experimental programs. 17 refs., 10 figs.

  18. Three-dimensional structure of flow in coal-cleaning cyclones. Technical progress report No. 4, June 1-August 31, 1986

    SciTech Connect

    Hwang, C.C.; Chiu, C.L.

    1986-09-23

    During the fourth report period, major tasks included: (1) the development of a mathematical modeling and computer simulation technique for studying the three-dimensional fluid flow in hydrocyclones; (2) analyses and measurements of the laser-beam refraction within a model hydrocyclone. 10 figs.

  19. Catwalk grate lifting tool

    DOEpatents

    Gunter, L.W.

    1992-08-11

    A device is described for lifting catwalk grates comprising an elongated bent member with a handle at one end and a pair of notched braces and a hook at the opposite end that act in conjunction with each other to lock onto the grate and give mechanical advantage in lifting the grate. 10 figs.

  20. Impedance sensing of flaws in non-homogeneous materials

    DOEpatents

    Novak, J.L.

    1997-02-11

    An apparatus and method are disclosed for sensing impedances of materials placed in contact therewith. The invention comprises a plurality of drive electrodes and one or more sense electrodes. Both rotating electric fields and differently shaped electric fields are provided for, as are analysis of structure and composition at different orientations and depths. 10 figs.

  1. Wristwatch dosimeter

    DOEpatents

    Wolf, M.A.; Waechter, D.A.; Umbarger, C.J.

    1986-08-26

    The disclosure is directed to a wristwatch dosimeter utilizing a CdTe detector, a microprocessor and an audio and/or visual alarm. The dosimeter is entirely housable with a conventional digital watch case having an additional aperture enabling the detector to receive radiation. 10 figs.

  2. Numerical method for estimating the size of chaotic regions of phase space

    SciTech Connect

    Henyey, F.S.; Pomphrey, N.

    1987-10-01

    A numerical method for estimating irregular volumes of phase space is derived. The estimate weights the irregular area on a surface of section with the average return time to the section. We illustrate the method by application to the stadium and oval billiard systems and also apply the method to the continuous Henon-Heiles system. 15 refs., 10 figs. (LSP)

  3. Josephson junction

    DOEpatents

    Wendt, J.R.; Plut, T.A.; Martens, J.S.

    1995-05-02

    A novel method for fabricating nanometer geometry electronic devices is described. Such Josephson junctions can be accurately and reproducibly manufactured employing photolithographic and direct write electron beam lithography techniques in combination with aqueous etchants. In particular, a method is described for manufacturing planar Josephson junctions from high temperature superconducting material. 10 figs.

  4. Carboxylic acid sorption regeneration process

    DOEpatents

    King, C.J.; Poole, L.J.

    1995-05-02

    Carboxylic acids are sorbed from aqueous feedstocks into an organic liquid phase or onto a solid adsorbent. The acids are freed from the sorbent phase by treating it with aqueous alkylamine thus forming an alkylammonium carboxylate which is dewatered and decomposed to the desired carboxylic acid and the alkylamine. 10 figs.

  5. Method for protection against genotoxic mutagenesis

    DOEpatents

    Grdina, D.J.

    1996-01-30

    A method and pharmaceutical for protecting against genotoxic damage in irradiated cells are disclosed. Reduction of mutations at the hypoxanthine-guanine phosphoribosyl transferase locus is accomplished by administering an effective dose of a compound having protected sulfhydryl groups which metabolize in vivo to produce both free sulfhydryl groups and disulfides. 10 figs.

  6. Airfoil and blade optimization for a direct-drive, permanent magnet wind generator

    SciTech Connect

    Dini, P.; Bayly, E.

    1996-12-31

    A new blade is designed for a small, variable-speed wind turbine by relying on available theoretical design and analysis methods. The performance predictions are compared to field test measurements and are found to be optimistic. This feedback sheds light on the interpretation of the theoretical results and is used to refine the design method. 9 refs., 10 figs.

  7. Few-nucleon transfer reactions on deformed nuclei

    SciTech Connect

    van den Berg, A.M.

    1985-01-01

    Recent developments discussed include: alpha-transfer reactions on deformed nuclei, quasi-elastic neutron transfer reactions induced by /sup 58/Ni beams on spherical and deformed samarium nuclei, and the population of low-lying states in neutron rich nuclei using (particle,..gamma..) or (particle,e) coincidence methods. 37 refs., 10 figs. (LEW)

  8. The empirical connection between (p,n) cross sections and beta decay transition strengths

    SciTech Connect

    Taddeucci, T.N.

    1988-01-01

    A proportionality is assumed to exist between 0/degree/ (p,n) cross sections and the corresponding beta decay transition strengths. The validity of this assumption is tested by comparison of measured (p,n) cross sections and analogous beta decay strengths. Distorted waves impulse approximation calculations also provide useful estimates of the accuracy of the proportionality relationship. 14 refs., 10 figs.

  9. Dynamic analysis of the Schilling Titan 7F robotic arm

    SciTech Connect

    Baker, C.P.

    1991-10-01

    A seven degree of freedom hydraulically actuated robotic arm is modeled using DADS. The low level control system for the arm is included in the model, as is the hydraulic system, and model results are compared with experimental results for the arm. Vane type rotary actuators are used in this arm, and a method for modeling them with DADS elements is presented. 10 figs.

  10. Folded-path optical analysis gas cell

    DOEpatents

    Carangelo, R.M.; Wright, D.D.

    1995-08-08

    A folded-path gas cell employs an elliptical concave mirror in confronting relationship to two substantially spherical concave mirrors. At least one of the spherical mirrors, and usually both, are formed with an added cylindrical component to increase orthogonal foci coincidence and thereby to increase the radiation energy throughput characteristic of the cell. 10 figs.

  11. Geothermal resources of the Southern Powder River Basin, Wyoming

    SciTech Connect

    Heasler, H.P.; Buelow, K.L.; Hinckley, B.S.

    1985-06-13

    This report describes the geothermal resources of the Southern Powder River Basin. The report contains a discussion of the hydrology as it relates to the movement of heated water, a description and interpretation of the thermal regime, and four maps: a generalized geological map, a structure contour map, a thermal gradient contour map, and a ground water temperature map. 10 figs. (ACR)

  12. Oxygen electrode in molten carbonate fuel cells

    SciTech Connect

    Dave, B.B.; White, R.E. . Dept. of Chemical Engineering); Srinivasan, S; Appleby, A.J. . Center for Electrochemical Systems and Hydrogen Research)

    1990-01-01

    During this quarter, impedance data were analyzed for oxygen reduction process in molten carbonate electrolyte and a manuscript, Impedance Analysis for Oxygen Reduction in a Lithium Carbonate Melt: Effects of Partial Pressure of Carbon Dioxide and Temperature,'' was prepared which will be submitted to Journal of the Electrochemical Society for publication. 31 refs., 10 figs., 5 tabs.

  13. Chemical vapor deposition of W-Si-N and W-B-N

    DOEpatents

    Fleming, J.G.; Roherty-Osmun, E.L.; Smith, P.M.; Custer, J.S.; Jones, R.V.; Nicolet, M.; Madar, R.; Bernard, C.

    1999-06-29

    A method of depositing a ternary, refractory based thin film on a substrate by chemical vapor deposition employing precursor sources of tungsten comprising WF[sub 6], either silicon or boron, and nitrogen. The result is a W-Si-N or W-B-N thin film useful for diffusion barrier and micromachining applications. 10 figs.

  14. Streamlined Microwave Omni-Directional Antennas

    DTIC Science & Technology

    1946-01-08

    floalng on tha feeder. An elevation pattern of a double 1 eleaent with aava trapa ia given In Fig. 10. Fig. 11 glvea tha (SKR)* over a band of a...elngle d uMe-H eleaent with aava trapa . It alll be obaerved perhap» that for none of these antennae are patterna it ma over a frequency band

  15. MESORAD dose assessment of the Chernobyl reactor accident

    SciTech Connect

    Ramsdell, J.V.; Hubbe, J.M.; Athey, G.F.; Davis, W.E.

    1989-12-01

    An accident involving Unit 4 of the Chernobylskaya Atomic Energy Station resulted in the release of a large amount of radioactive material to the atmosphere. This report describes the results of an assessment of the doses near the site (within 80 km) made at the Pacific Northwest Laboratory using the MESORAD Dose Assessment model. 6 refs., 10 figs., 5 tabs.

  16. Electroweak symmetry breaking: Top quard condensates

    SciTech Connect

    Bardeen, W.A.

    1990-12-01

    The fundamental mechanisms for the dynamical breaking of the electroweak gauge symmetries remain a mystery. This paper examines the possible role of heavy fermions, particularly the top quark, in generating the observed electroweak symmetry breaking, the masses of the W and Z bosons and the masses of all observed quarks and leptons. 27 refs., 10 figs., 4 tabs.

  17. Electromagnetic field-computation for particle accelerators, today and tomorrow

    SciTech Connect

    Turner, L.R.; Kettunen, L.

    1991-01-01

    In this paper, we first review the magnets needed in accelerators, then discuss computations for accelerator magnets performed with present codes, and finally describe a new volume integral code which shows promise, and should be suitable for parallel computation. 9 refs., 10 figs.

  18. Dijet spectroscopy at high luminosity

    SciTech Connect

    Green, D.

    1990-07-01

    A study of the dijet mass resolution has been made appropriate to high luminosity operation. As a benchmark, the mass resolution of W {yields} jj for a Higgs boson of 800 GeV has been optimized for no, eight, and sixteen overlapping minbias events. A factor of 2.5 degradation in M{sub jj} width is seen. 6 refs., 10 figs.

  19. Coal flow aids reduce coke plant operating costs and improve production rates

    SciTech Connect

    Bedard, R.A.; Bradacs, D.J.; Kluck, R.W.; Roe, D.C.; Ventresca, B.P.

    2005-06-01

    Chemical coal flow aids can provide many benefits to coke plants, including improved production rates, reduced maintenance and lower cleaning costs. This article discusses the mechanisms by which coal flow aids function and analyzes several successful case histories. 2 refs., 10 figs., 1 tab.

  20. Countercurrent flow absorber and desorber

    DOEpatents

    Wilkinson, W.H.

    1984-10-16

    Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle thermal boosting systems in which steam serves both as the refrigerant vapor which is supplied to the absorber section and as the supply of heat to drive the desorber section of the system. 9 figs.

  1. Aluminum reduction cell electrode

    DOEpatents

    Goodnow, W.H.; Payne, J.R.

    1982-09-14

    The invention is directed to cathode modules comprised of refractory hard metal materials, such as TiB[sub 2], for an electrolytic cell for the reduction of alumina wherein the modules may be installed and replaced during operation of the cell and wherein the structure of the cathode modules is such that the refractory hard metal materials are not subjected to externally applied forces or rigid constraints. 9 figs.

  2. Indoor unit for electric heat pump

    DOEpatents

    Draper, R.; Lackey, R.S.; Fagan, T.J. Jr.; Veyo, S.E.; Humphrey, J.R.

    1984-05-22

    An indoor unit for an electric heat pump is provided in modular form including a refrigeration module, an air mover module, and a resistance heat package module, the refrigeration module including all of the indoor refrigerant circuit components including the compressor in a space adjacent the heat exchanger, the modules being adapted to be connected to air flow communication in several different ways as shown to accommodate placement of the unit in various orientations. 9 figs.

  3. F2 Boundary Layer Measurement in a Chemical Laser Slit Nozzle Flow.

    DTIC Science & Technology

    1983-02-15

    detector assembly mounted on top of the test 9 *Fig. 2. Experimental array used in measurements across jet TRANSLATION STAGE ASSEMBLY CaF...N2PUG Fig. 3. Slit nozzle F2 absorption scanning experiment 10 --’ -- section. The 450 folding mirror is mounted on a translation stage controll- able...from outside the test section via flexible coupling cable for micrometer movement across the jets. In addition, the mirrur mount provides the mirror

  4. 140 GHz microwave FEL experiments using ELF-II

    SciTech Connect

    Throop, A.L.; Jong, R.A.; Atkinson, D.P.; Clark, J.C.; Felker, B.; Ferguson, S.W.; Makowski, M.A.; Nexsen, W.E.; Stallard, B.W.; Stever, R.D.; Turner, W.C.

    1989-09-01

    We describe the modeling, the experimental facility, and the initial operating results for ELF-II, an induction-linac based free-electron laser designed to produce up to 2 GW of peak power at 140 GHz. ELF-II is the initial configuration of an FEL system which will eventually produce up to 2 MW of average power at a frequency of 250 GHz, for use in plasma heating experiments in the Microwave Tokamak Experiment. 6 refs., 9 figs.

  5. Life cycle investigation of CO{sub 2} recovery and sequestration

    SciTech Connect

    Hsien H. Khoo; Reginald B.H. Tan

    2006-06-15

    The Life Cycle Assessment of four technologies for CO{sub 2} recovery from coal-fired power generators, combined with nine CO{sub 2} sequestration systems, serves to expand the debate of CO{sub 2} mitigation methods beyond a single issue - prevention of global warming - to a wider range of environmental concerns: resource depletion, acidic and toxic gases, wastes, etc., so that the overall, and unexpected, environmental impacts may be revealed. 48 refs., 9 figs., 2 tabs.

  6. Near net shape processing of continuous lengths of superconducting wire

    DOEpatents

    Danyluk, S.; McNallan, M.; Troendly, R.; Poeppel, R.; Goretta, K.; Lanagan, M.

    1997-08-26

    A system and method for mechanically forming a ceramic superconductor product are disclosed. A system for making the ceramic superconductor includes a metallic channel portion having a cross section for receiving a ceramic superconductor powder, a roll to mechanically reduce the channel cross section and included superconductor powder and a cap portion welded to the channel portion using a localized high energy source. The assembled bar is then mechanically reduced to form a tape or wire end product. 9 figs.

  7. Use of accident experience in developing criteria for teleoperator equipment

    SciTech Connect

    Vallario, E.J.; Selby, J.M.

    1985-10-01

    The 1961 SL-1 reactor accident in Idaho and the Recuplex accident at Hanford are reviewed to identify problems common to emergency situations, lessons learned from accidents, criteria for emergency equipment, and recommendations for using robotics to solve problems during emergencies. Teleoperator equipment could be used to assess the extent of the damage and the condition of the reactor, retrieve dosimeters, evacuate and treat accident victims, clean up debris and decontaminate accident areas. 2 refs., 9 figs.

  8. Hydrogeologic model of the Ahuachapan geothermal field, El Salvador

    SciTech Connect

    Laky, C.; Lippmann, M.J.; Bodvarsson, G.S. ); Retana, M.; Cuellar, G. )

    1989-01-01

    A hydrogeological model of the Ahuachapan geothermal field has been developed. It considers the lithology and structural features of the area and discerns their impact on the movement of cold and hot fluids in the system. Three aquifers were identified, their zones of mixing and flow patterns were obtained on the basis of temperature and geochemical data from wells and surface manifestations. 12 refs., 9 figs.

  9. Opening address (for the International Conference on Hadron Spectroscopy)

    SciTech Connect

    Lindenbaum, S.J.

    1985-01-01

    Some historical perspective and comments are presented on some aspects of the present state of the field of hadron interactions and its potential future. Included in the discussion are the results of pion-nucleon cross sections measurements of the 1950's, the ''double pole'' of the A2 (which later was found to be wrong), and the local gauge invariant SU(3)/sub color/ and QCD. 9 refs., 9 figs. (LEW)

  10. Improved technique for one-way transformation of information

    DOEpatents

    Cooper, J.A.

    1987-05-11

    Method and apparatus are provided for one-way transformation of data according to multiplication and/or exponentiation modulo a prime number. An implementation of the invention permits the one way residue transformation, useful in encryption and similar applications, to be implemented by n-bit computers substantially with no increase in difficulty or complexity over a natural transformation thereby, using a modulus which is a power of two. 9 figs.

  11. Non-intrusive appliance monitor apparatus

    DOEpatents

    Hart, G.W.; Kern, E.C. Jr.; Schweppe, F.C.

    1989-08-15

    A non-intrusive monitor of energy consumption of residential appliances is described in which sensors, coupled to the power circuits entering a residence, supply analog voltage and current signals which are converted to digital format and processed to detect changes in certain residential load parameters, i.e., admittance. Cluster analysis techniques are employed to group change measurements into certain categories, and logic is applied to identify individual appliances and the energy consumed by each. 9 figs.

  12. Natural cements: How can they help us safely dispose of radioactive waste?

    SciTech Connect

    Alexander, W.R.; McCombie, C.; McKinley, I.

    1995-09-01

    This article discusses both the positive aspects of the use of natural cements to sorb and immobalize radionuclides in radioactive waste and the questions which must be addressed in considering this option for radioactive waste disposal. Areas of interest/concern include high pH plume, microbiology, corrosion, colloids, {sup 14}C retardation, and radionuclide speciation. Specific examples of site investigations are presented, and the implications for respository safety are discussed. 9 figs., 3 tabs.

  13. Raman activity in synchronously dividing bacteria

    SciTech Connect

    Layne, S.P.

    1985-01-01

    Using a spectrometer equipped with an optical-multichannel analyzer as the detector (OMA), we have observed the Stokes laser-Raman spectra of metabolically active Escherichia coli and Bacillus megaterium from 100 - 2100 cm/sup -1/. After lengthy investigation, no Raman lines attributable to the metabolic process nor the cells themselves were found. Previous Raman spectra of active bacteria cannot be used to support nonlinear theories in biology. 34 refs., 9 figs.

  14. Measurement of /var epsilon/'//var epsilon/ at Fermilab

    SciTech Connect

    Hsiung, Yee B.

    1988-10-01

    The current status of the measurement of ''direct'' CP violation parameters /var epsilon/'//var epsilon/ in the Fermilab experiment E731 is reviewed. Preliminary results on upper limit for the decays K/sub L/ ..-->.. ..pi../sup 0/e/sup +/e/sup /minus// and ..pi../sup 0/ ..-->.. e/sup +/e/sup /minus// (from 20% of the data taken in 1987-88) are also reported. 9 refs., 9 figs., 1 tab.

  15. Influence of volcanic eruptions on the troposphere through stratospheric dynamical processes in the northern hemisphere winter

    SciTech Connect

    Kodera, K.

    1994-01-20

    Volcanic eruptions contribute significant quantities of aerosols into the stratosphere which may create strong polar wind anomalies, particularly in the winter stratosphere. This article examines the idea that the influence of volcano-derived aerosols may produce changes in winter atmospheric circulation in the northern hemisphere. Changes in atmospheric circulation following three recent volcanic eruptions are monitored and possible mechanisms for the production of tropospheric effects through dynamic stratospheric process are discussed. 21 refs., 9 figs.

  16. Longitudinal damping in the Tevatron collider

    SciTech Connect

    Kerns, Q.A.; Jackson, G.; Kerns, C.R.; Miller, H.; Reid, J.; Siemann, R.; Wildman, D.

    1989-03-01

    This paper describes the damper design for 6 proton on 6 pbar bunches in the Tevatron collider. Signal pickup, transient phase detection, derivative networks, and phase correction via the high-level rf are covered. Each rf station is controlled by a slow feedback loop. In addition, global feedback loops control each set of four cavities, one set for protons and one set for antiprotons. Operational experience with these systems is discussed. 7 refs., 9 figs.

  17. Cooling system for continuous metal casting machines

    DOEpatents

    Draper, R.; Sumpman, W.C.; Baker, R.J.; Williams, R.S.

    1988-06-07

    A continuous metal caster cooling system is provided in which water is supplied in jets from a large number of small nozzles against the inner surface of rim at a temperature and with sufficient pressure that the velocity of the jets is sufficiently high that the mode of heat transfer is substantially by forced convection, the liquid being returned from the cooling chambers through return pipes distributed interstitially among the nozzles. 9 figs.

  18. Means and apparatus for throttling a dry pulverized solid material pump

    DOEpatents

    Meyer, J. W.; Daniel, Jr, A. D.; Bonin, J. H.

    1982-12-07

    Method and apparatus are shown for control of continuous feeding of pulverized material to a high pressure container. A rotor is located within the high pressure container. The pulverized material is fed from a feed hopper through a stationary feed pipe to a vented spin-up zone chamber to a plurality of sprues mounted in the rotor. Control of the pressure within control nozzles downstream from the sprues adjusts the flow rate of coal through the sprues. 9 figs.

  19. Construction and testing of the SLD Cerenkov Ring Imaging Detector

    SciTech Connect

    Cavalli-Sforza, M.; Coyle, P.; Coyne, D.; Gagnon, P.; Williams, D.A.; Zucchelli, P. . Inst. for Particle Physics); Whitaker, J.S.; Wilson, R.J. . Dept. of Physics); Bean, A.; Caldwell, D.; Duboscq, J.; Huber, J.; Lu, A.; Mathys, L.; McHugh, S.; Morrison, R.; Witherell, M.; Yellin, S. . Dept. of Physics); Johns

    1990-01-01

    We report on the construction of the Cerenkov Ring Imaging Detector (CRID) for the SLD experiment at the SLAC Linear Collider and the testing of its components. We include results from testing the drift boxes, liquid radiator trays, and mirrors for the barrel CRID. We also discuss development of the support systems essential for the operation of the CRID: gas and liquid recirculator systems and monitoring. 15 refs., 9 figs.

  20. Critical study of type II supernovae: equations of state and general relativity

    SciTech Connect

    Kahana, S.

    1986-01-01

    The relevance of relativistic gravitation and of the properties of nuclear matter at high density to supernova explosions is examined in detail. The existing empirical knowledge on the nuclear equation of state at densities greater than saturation, extracted from analysis of heavy ion collisions and from the breathing mode in heavy nuclei, is also considered. Particulars of the prompt explosions recently obtained theoretically by Baron, Cooperstein, and Kahana are presented. 40 refs., 9 figs., 3 tabs.

  1. Multi-stage depressed collector for small orbit gyrotrons

    DOEpatents

    Singh, A.; Ives, R.L.; Schumacher, R.V.; Mizuhara, Y.M.

    1998-07-14

    A multi-stage depressed collector for receiving energy from a small orbit gyrating electron beam employs a plurality of electrodes at different potentials for sorting the individual electrons on the basis of their total energy level. Magnetic field generating coils, for producing magnetic fields and magnetic iron for magnetic field shaping produce adiabatic and controlled non-adiabatic transitions of the incident electron beam to further facilitate the sorting. 9 figs.

  2. Flashover vulnerability of transmission and distribution lines to high-altitude electromagnetic pulse (HEMP)

    SciTech Connect

    Kruse, V.J.; Liu, T.K.; Tesche, F.M.; Barnes, P.R.

    1989-01-01

    This paper estimates the vulnerability of transmission and distribution lines to flashover from the electromagnetic pulse generated by a nuclear detonation 400 kilometers above the earth. The analysis consists of first determining the cumulative probability of induced-voltage on three-phase lines, including shield and neutral conductors, for four operating voltages and then comparing these stresses to estimates of line insulation strength. 11 refs., 9 figs., 5 tabs.

  3. Electric Utility Industry Experience with Geomagnetic Disturbances

    DTIC Science & Technology

    1991-09-01

    the March 13, 1989, geomagnetic storm. Source: North American Electric Reliability Council ................................................ 9 Fig. 2.2...Events and K intensity recorded in North America during the March 13, 1989, geomagnetic storm. Source: North American Electric Reliability Council. 2.2...Unit I experienced VAR excursions of 150 to 200 MVAR. Additional VARs were consumed by the saturated step-up transformers. An empirical equation

  4. Thermal properties of the Grouse Canyon Member of the Belted Range tuff and of Tunnel Bed 5, G-Tunnel, Nevada Test Site

    SciTech Connect

    Lappin, A.R.; Nimick, F.B.

    1985-08-01

    Thermal conductivity and thermal expansion data for tuffs of the devitrified welded Grouse Canyon Member and for the zeolitized nonwelded Tunnel Bed 5 are presented. Thermal properties have been found to be a function of mineralogy and saturation. Thermal conductivity results also are affected by matrix and fracture porosity, and thermal expansion behavior is a function of confining and fluid pressures. This work is being performed as part of the Nevada Nuclear Waste Storage Investigations Project. 17 refs., 9 figs., 5 tabs.

  5. Integration of photoactive and electroactive components with vertical cavity surface emitting lasers

    DOEpatents

    Bryan, R.P.; Esherick, P.; Jewell, J.L.; Lear, K.L.; Olbright, G.R.

    1997-04-29

    A monolithically integrated optoelectronic device is provided which integrates a vertical cavity surface emitting laser and either a photosensitive or an electrosensitive device either as input or output to the vertical cavity surface emitting laser either in parallel or series connection. Both vertical and side-by-side arrangements are disclosed, and optical and electronic feedback means are provided. Arrays of these devices can be configured to enable optical computing and neural network applications. 9 figs.

  6. Method for regenerating magnetic polyamine-epichlorohydrin resin

    DOEpatents

    Kochen, R.L.; Navratil, J.D.

    1997-07-29

    Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately. 9 figs.

  7. Removal of radioactive materials and heavy metals from water using magnetic resin

    DOEpatents

    Kochen, R.L.; Navratil, J.D.

    1997-01-21

    Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately. 9 figs.

  8. Corrosion behavior of vanadium alloys in flowing lithium

    SciTech Connect

    Chopra, O.K.; Smith, D.L.

    1987-08-01

    Corrosion data are presented for several vanadium alloys exposed to flowing lithium at 427, 482, and 538/sup 0/C. The corrosion behavior is evaluated by weight change measurements. Metallographic results and data on the nonmetallic element transfer in lithium-exposed specimens are also presented. The influence of alloy composition and exposure conditions on the corrosion behavior of vanadium alloys is discussed. 6 refs., 9 figs., 2 tabs.

  9. Thermostable purified endoglucanase II from Acidothermus cellulolyticus ATCC

    DOEpatents

    Adney, W.S.; Thomas, S.R.; Nieves, R.A.; Himmel, M.E.

    1994-11-22

    A purified low molecular weight endoglucanase II from Acidothermus cellulolyticus (ATCC 43068) is disclosed. The endoglucanase is water soluble, possesses both C[sub 1], and C[sub x] types of enzyme activity, a high degree of stability toward heat, and exhibits optimum temperature activity at about 81 C at pH's from about 2 to about 9, and at a inactivation temperature of about 100 C at pH's from about 2 to about 9. 9 figs.

  10. Recombinant plasmids for encoding restriction enzymes DpnI and DpnII of Streptococcus pneumontae

    DOEpatents

    Lacks, S.A.

    1990-10-02

    Chromosomal DNA cassettes containing genes encoding either the DpnI or DpnII restriction endonucleases from Streptococcus pneumoniae are cloned into a streptococcal vector, pLS101. Large amounts of the restriction enzymes are produced by cells containing the multicopy plasmids, pLS202 and pLS207, and their derivatives pLS201, pLS211, pLS217, pLS251 and pLS252. 9 figs.

  11. Corrosion resistant iron aluminides exhibiting improved mechanical properties and corrosion resistance

    DOEpatents

    Liu, C.T.; McKamey, C.G.; Tortorelli, P.F.; David, S.A.

    1994-06-14

    The specification discloses a corrosion-resistant intermetallic alloy comprising, in atomic percent, an FeAl iron aluminide containing from about 30 to about 40% aluminum alloyed with from about 0.01 to 0.4% zirconium and from 0.01 to about 0.8% boron. The alloy exhibits considerably improved room temperature ductility for enhanced usefulness in structural applications. The high temperature strength and fabricability is improved by alloying with molybdenum, carbon, chromium and vanadium. 9 figs.

  12. The digital data acquisition chain and the cosmic ray trigger system for the SLD Warm Iron Calorimeter

    SciTech Connect

    Benvenuti, A.; Piemontese, L.; Calcaterra, A.; De Sangro, R.; De Simone, P.; Burrows, P.N.; Cartwright, S.L.; Gonzales, S.; Lath, A.; Schneekloth, U.; Williams, D.C.; Yamartino, J.M.; Bacchetta, N.; Bisello, D.; Castro, A.; Galvagni, S.; Loreti, M.; Pescara, L.; Wyss, J.; Alpat, B.; Bilei, G.M.; Checcucci, B.; Dell'Orso, R.; Pauluzzi, M.; Servoli, L.; Carpinelli, M.; Castaldi, R.; Cazzola, U.; Vannini, C.; Verdini, P.G.; Messn

    1989-08-01

    The entire data-acquisition chain, from the custom-made front-end electronics to the Fastbus readout and data-reduction module, for the digital readout of the SLD limited streamer tube Warm Iron Calorimeter and Muon Identifier is described. Also described is a Fastbus Cosmic Logic Unit being developed to achieve the capability of reading cosmic ray events, also during the inter-crossing time, for apparatus monitoring and calibration purposes. 9 refs., 9 figs.

  13. Department of Energy low-level radioactive waste disposal concepts

    SciTech Connect

    Ozaki, C.; Page, L.; Morreale, B.; Owens, C.

    1990-01-01

    The Department of Energy (DOE) manages its low-level waste (LLW), regulated by DOE Order 5820.2A by using an overall systems approach. This systems approach provides an improved and consistent management system for all DOE LLW waste, from generation to disposal. This paper outlines six basic disposal concepts used in the systems approach, discusses issues associated with each of the concepts, and outlines both present and future disposal concepts used at six DOE sites. 3 refs., 9 figs.

  14. Y chromosome specific nucleic acid probe and method for determining the Y chromosome in situ

    DOEpatents

    Gray, J.W.; Weier, H.U.

    1998-11-24

    A method for producing a Y chromosome specific probe selected from highly repeating sequences on that chromosome is described. There is little or no nonspecific binding to autosomal and X chromosomes, and a very large signal is provided. Inventive primers allowing the use of PCR for both sample amplification and probe production are described, as is their use in producing large DNA chromosome painting sequences. 9 figs.

  15. Y chromosome specific nucleic acid probe and method for identifying the Y chromosome in SITU

    DOEpatents

    Gray, J.W.; Weier, H.U.

    1999-03-30

    A method for producing a Y chromosome specific probe selected from highly repeating sequences on that chromosome is described. There is little or no nonspecific binding to autosomal and X chromosomes, and a very large signal is provided. Inventive primers allowing the use of PCR for both sample amplification and probe production are described, as is their use in producing large DNA chromosome painting sequences. 9 figs.

  16. Observation of t quark production at CDF

    SciTech Connect

    Yao, Weiming; CDF Collaboration

    1997-04-01

    We present CDF results on the observation of the top quark and the study of its properties using 100 pb{sup -1} of data collected at the Tevatron collider at {radical}s = 1.8 TeV during the 1992-1995 period. Updated counting results and consistency checks between these data and earlier published mass and cross section are given. 8 refs., 9 figs., 2 tabs.

  17. Dynamic high pressure process for fabricating superconducting and permanent magnetic materials

    DOEpatents

    Nellis, W.J.; Geballe, T.H.; Maple, M.B.

    1990-03-13

    Shock wave formation of thin layers of materials with improved superconducting and permanent magnetic properties and improved microstructures is disclosed. The material fabrication system includes a sandwiched structure including a powder material placed between two solid members to enable explosive shock consolidation. The two solid members are precooled to about 80--100 K to reduce the residual temperatures attained as a result of the shock wave treatment, and thereby increase the quench rate of the consolidated powder. 9 figs.

  18. Chemical characterization of the surface sites of coal

    SciTech Connect

    Dwight, D.W.; Lloyd, T.B.; Riddle, F.L. Jr.; Cole, D.A.

    1991-04-01

    This report contains a method for determining the van der Waals and acid-base contributions to the overall {sup 31}P chemical shifts ({Delta}{delta}{sup d} and {Delta}{delta}{sup ab}) and to the Acceptor Numbers (AN{sup d} and AN{sup ab}) of the Meyer and Gutmann two-component systems, and to illustrate the method with experimental results for thirty-two liquids. 9 refs., 9 figs., 6 tabs.

  19. A comparison of spent fuel assembly control instruments: The Cadarache PYTHON and the Los Alamos Fork

    SciTech Connect

    Bignan, G.; Capsie, J.; Romeyer-Dherbey, J. . Direction des Reacteurs Nucleaires); Rinard, P. )

    1991-01-01

    Devices to monitor spent fuel assemblies while stored under water with nondestructive assay methods, have been developed in France and in the United States. Both devices are designed to verify operator's declared values of exposures and cooling-time but the applications and thus the designs of the systems differ. A study, whose results are presented in this paper, has been conducted to compare the features and the performances of the two instruments. 4 refs., 9 figs.

  20. Clothing for Sports: Part 2: Stridalongapos Loses Shorts, Wins in Style

    PubMed Central

    Schamberger, Wolf

    1985-01-01

    The choice of clothing for sports must take into account the climate, movement, ability to enhance athletic performance, safety and comfort. Part 2 of this two-part article describes the clothing needed for running, cycling, skiing, windsurfing, triathlon, aerobic dancing and hot air ballooning. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5Fig. 6Fig. 7Fig. 8Fig. 9Fig. 10 PMID:21274232

  1. Achieving supercomputer performance for neural net simulation with an array of digital signal processors

    SciTech Connect

    Muller, U.A.; Baumle, B.; Kohler, P.; Gunzinger, A.; Guggenbuhl, W.

    1992-10-01

    Music, a DSP-based system with a parallel distributed-memory architecture, provides enormous computing power yet retains the flexibility of a general-purpose computer. Reaching a peak performance of 2.7 Gflops at a significantly lower cost, power consumption, and space requirement than conventional supercomputers, Music is well suited to computationally intensive applications such as neural network simulation. 12 refs., 9 figs., 2 tabs.

  2. Variable laser attenuator

    DOEpatents

    Foltyn, S.R.

    1987-05-29

    The disclosure relates to low loss, high power variable attenuators comprising one or more transmissive and/or reflective multilayer dielectric filters. The attenuator is particularly suitable to use with unpolarized lasers such as excimer lasers. Beam attenuation is a function of beam polarization and the angle of incidence between the beam and the filter and is controlled by adjusting the angle of incidence the beam makes to the filter or filters. Filters are selected in accordance with beam wavelength. 9 figs.

  3. Operating experience and multi-fuel capability of large-scale CFB boilers

    SciTech Connect

    Cleve, K.; Smith, T.V.

    1997-12-31

    Large scale (250 MW{sub e}) circulating fluidized bed (CFB) boilers capable of effectively utilising a wide range of low grade fuels in an environmentally acceptable manner are now a well proven and reliable technology. Development of this technology and innovative design features continues and three plants - each in their own way representing a significant advance - are discussed. Key technical features and operating experience including availability are reviewed. Fuel variability and test data are also presented. 9 figs.

  4. Tutorial guide to the tau lepton and close-mass lepton pairs

    SciTech Connect

    Perl, M.L.

    1988-10-01

    This is a tutorial guide to present knowledge of the tau lepton, to the tau decay mode puzzle, and to present searches for close-mass lepton pairs. The test is minimal; the emphasis is on figures, tables and literature references. It is based on a lecture given at the 1988 International School of Subnuclear Physics: The Super World III. 54 refs., 9 figs., 7 tabs.

  5. Semi-automatic for ultrasonic measurement of texture

    DOEpatents

    Thompson, R.B.; Smith, J.F.; Lee, S.S.; Li, Y.

    1990-02-13

    A method for measuring texture of metal plates or sheets using non-destructive ultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed. Texture or preferred grain orientation can be derived from these measurements with improved reliability and accuracy. The method can be utilized in production on moving metal plate or sheet. 9 figs.

  6. Nuclear technologies for Moon and Mars exploration

    SciTech Connect

    Buden, D.

    1991-01-01

    Nuclear technologies are essential to successful Moon and Mars exploration and settlements. Applications can take the form of nuclear propulsion for transport of crews and cargo to Mars and the Moon; surface power for habitats and base power; power for human spacecraft to Mars; shielding and life science understanding for protection against natural solar and cosmic radiations; radioisotopes for sterilization, medicine, testing, and power; and resources for the benefits of Earth. 5 refs., 9 figs., 3 tabs.

  7. Solidification of problem wastes: Annual progress report, October 1985-September 1986

    SciTech Connect

    Franz, E.M.; Heiser, J.H. III; Colombo, P.

    1987-02-01

    This report describes initial work on the development of solidification systems for sodium nitrate waste and compacted waste. Sodium nitrate waste has been solidified in three types of materials: polyethylene, polyester-styrene (PES), and latex cement. Evaluations of the properties of the waste form, such as the ANS 16.1 leaching test, water immersion test and compressive strength measurements were performed on the waste forms containing various amounts of sodium nitrate. 9 refs., 9 figs., 7 tabs.

  8. Mechanical and electromagnetic design of the SSC QSE101 quadrupole ends

    SciTech Connect

    Orrell, D.; Nobrega, F.; Lilly, J.; Snitchler, G.; Jayakumar, J.; Venkatraman, V. ); Brandt, J.S. )

    1991-06-01

    The SSC collider magnets feature grouped ends in which cables of a particular coil remain stacked together as they are gent around the end. methods have been developed to form the ends in such a way that mechanical stresses are lowered and field quality is optimized. This paper discusses techniques of end turn design and presents calculations of harmonics and peak fields for the SSC quadrupole QSE101. 5 refs., 9 figs.

  9. Microporous polymer films and methods of their production

    DOEpatents

    Aubert, J.H.

    1995-06-06

    A process is described for producing thin microporous polymeric films for a variety of uses. The process utilizes a dense gas (liquefied gas or supercritical fluid) selected to combine with a solvent-containing polymeric film so that the solvent is dissolved in the dense gas, the polymer is substantially insoluble in the dense gas, and two phases are formed. A microporous film is obtained by removal of a dense gas-solvent phase. 9 figs.

  10. Debris exhaust system

    DOEpatents

    McBride, D.D.; Bua, D.; Domankevitz, Y.; Nishioka, N.

    1998-06-23

    A debris removal system removes debris from a work site by flowing fluid away from the work site toward the periphery of a structure. The fluid flow can be kept constant around the periphery so that debris is removed evenly. The structure can have a reduced cross section between the fluid inlet and the work site so that the resulting increased fluid velocity works to prevent debris from escaping. 9 figs.

  11. Process for producing carbon foams for energy storage devices

    DOEpatents

    Kaschmitter, J.L.; Mayer, S.T.; Pekala, R.W.

    1998-08-04

    A high energy density capacitor incorporating a variety of carbon foam electrodes is described. The foams, derived from the pyrolysis of resorcinol-formaldehyde and related polymers, are high density (0.1 g/cc--1.0 g/cc) electrically conductive and have high surface areas (400 m{sup 2}/g--1,000 m{sup 2}/g). Capacitances on the order of several tens of farad per gram of electrode are achieved. 9 figs.

  12. Carbon foams for energy storage devices

    DOEpatents

    Kaschmitter, J.L.; Mayer, S.T.; Pekala, R.W.

    1996-06-25

    A high energy density capacitor incorporating a variety of carbon foam electrodes is described. The foams, derived from the pyrolysis of resorcinol-formaldehyde and related polymers, are high density (0.1 g/cc--1.0 g/cc) electrically conductive and have high surface areas (400 m{sup 2}/g-1000 m{sup 2}/g). Capacitances on the order of several tens of farad per gram of electrode are achieved. 9 figs.

  13. Alpha2-Adrenergic Receptors and Breast Tumor Stroma: A Novel Pathway Driving Breast Cancer Growth and Metastasis

    DTIC Science & Technology

    2014-10-01

    transforming growth factor- beta (TGF-ß) were measured in tumor homogenates (14). DEX treatment did not alter tumor MMP-2, -3, and pro-MMP-9 (Fig. 4A-C) or...progression and should be further explored, especially in the context of evaluating the safety of ß- blockers in breast cancer patients...of bio-behavioural factors on tumour biology: pathways and mechanisms. Nat Rev Cancer 6: 240-8 3. Cole SW, Sood AK. 2012. Molecular pathways: beta

  14. Site Study Plan for Acoustics, Deaf Smith County Site, Texas: Environmental Field Program: Preliminary draft

    SciTech Connect

    Not Available

    1987-06-01

    The Acoustics site study plan describes a field program which characterizes existing sound levels, determines the area's sound propagation characteristics, and monitors the project-related sound emissions. The plan describes for each study: the need for the study, study design, data management and use, schedule, and quality assurance requirements. These studies will provide data needed to satisfy requirements contained in, or derived from, the Salt Repository Requirements Document. 37 refs., 9 figs., 3 tabs.

  15. Microwave sintering of ceramics

    SciTech Connect

    Snyder, W.B.

    1989-01-01

    Successful adaptation of microwave heating to the densification of ceramic materials require a marriage of microwave and materials technologies. Using an interdisciplinary team of microwave and materials engineers, we have successfully demonstrated the ability to density ceramic materials over a wide range of temperatures. Microstructural evolution during microwave sintering has been found to be significantly different from that observed in conventional sintering. Our results and those of others indicate that microwave sintering has the potential to fabricate components to near net shape with mechanical properties equivalent to hot pressed or hot isostatically pressed material. 6 refs., 11 figs.

  16. Ringfield lithographic camera

    DOEpatents

    Sweatt, W.C.

    1998-09-08

    A projection lithography camera is presented with a wide ringfield optimized so as to make efficient use of extreme ultraviolet radiation from a large area radiation source (e.g., D{sub source} {approx_equal} 0.5 mm). The camera comprises four aspheric mirrors optically arranged on a common axis of symmetry. The camera includes an aperture stop that is accessible through a plurality of partial aperture stops to synthesize the theoretical aperture stop. Radiation from a mask is focused to form a reduced image on a wafer, relative to the mask, by reflection from the four aspheric mirrors. 11 figs.

  17. Method of protecting surfaces from abrasion and abrasion resistant articles of manufacture

    DOEpatents

    Hirschfeld, T.B.

    1988-06-09

    Surfaces of fabricated structures are protected from damage by impacting particulates by a coating of hard material formed as a mass of thin flexible filaments having root ends secured to the surface and free portions which can flex and overlap to form a resilient cushioning mat which resembles hair or fur. The filamentary coating covers the underlying surface with hard abrasion resistance material while also being compliant and capable of local accommodation to particle impacts. The coating can also function as thermal and/or acoustical insulation and has a friction reducing effect. 11 figs.

  18. Blue, green, orange, and red upconversion laser

    DOEpatents

    Xie, P.; Gosnell, T.R.

    1998-09-08

    A laser is disclosed for outputting visible light at the wavelengths of blue, green, orange and red light. This is accomplished through the doping of a substrate, such as an optical fiber or waveguide, with Pr{sup 3+} ions and Yb{sup 3+} ions. A light pump such as a diode laser is used to excite these ions into energy states which will produce lasing at the desired wavelengths. Tuning elements such as prisms and gratings can be employed to select desired wavelengths for output. 11 figs.

  19. On weak decays of heavy flavors, mixing and CP violation

    SciTech Connect

    Bigi, I.I.

    1987-10-01

    Detailed studies of weak decays serve not only to confirm the Standard Model, but possess also a high sensitivity to New Physics: tau and top decays are discussed in this vein, with some short remarks on beauty and charm. The sensitivity to New Physics is even higher in delicate phenomena like mixing and CP violation: a fairly detailed discussion on K/sup 0/ - anti K/sup 0/, D/sup 0/ - anti D/sup 0/, and B/sup 0/ - anti B/sup 0/ mixing and on CP violation in K/sup 0/ and B decays is presented. 48 refs., 11 figs.

  20. An introduction to baryon violation in standard electroweak theory

    SciTech Connect

    Arnold, P.B.

    1990-12-01

    I shall begin with a qualitative overview of the anomaly and B violation at zero and non-zero temperature, demonstrating how these processes may be understood on the back of an envelope. Then I shall discuss a part of the formalism necessary for doing calculations in more detail. Specifically, B violation is related to various solutions to the Euclidean equations of motion; instantons, sphalerons, and calorons (also called periodic instantons). The applicability of the various solutions may be understood by analogies with elementary quantum mechanics problems. Finally, I shall touch upon the computation of high-energy B violation mentioned above. 29 refs., 11 figs.

  1. Thermodynamic data management system for nuclear waste disposal performance assessment

    SciTech Connect

    Phillips, S.L.; Hale, F.V.; Siegel, M.D.

    1988-04-01

    Thermodynamic property values for use in assessing the performance of a nuclear waste repository are described. More emphasis is on a computerized data base management system which facilitates use of the thermodynamic data in sensitivity analysis and other studies which critically assess the performance of disposal sites. Examples are given of critical evaluation procedures; comparison of apparent equilibrium constants calculated from the data base, with other work; and of correlations useful in estimating missing values of both free energy and enthalpy of formation for aqueous species. 49 refs., 11 figs., 6 tabs.

  2. Zeolite-filled PDMS membranes. 1. Sorption of halogenated hydrocarbons

    SciTech Connect

    Vankelecom, I.F.J.; Dotermont, C.; Morobe, M.; Uytterhoeven, J.B.; Vandecasteele, C.

    1997-03-20

    Aiming at a more thorough understanding of the influence of zeolite fillers in PDMS membranes on the pervaporation of chlorinated hydrocarbons from aqueous solutions, the sorption aspect of this separation process was studied. Firstly, the sorption of water and five different chlorinated hydrocarbons was investigated in the zeolite and the polymer separately. Secondly, the composite system was considered and conclusions were drawn concerning interactions at the zeolite-polymer interphase. Finally, the sorption results obtained on the self-synthesized membranes were compared with measurements on commercially available PDMS membranes (GFT). 23 refs., 11 figs., 3 tabs.

  3. An overview: Challenges in wind technology development

    SciTech Connect

    Thresher, R.W.; Hock, S.M.

    1991-12-01

    Developing innovative wind turbine components and advanced turbine configurations is a primary focus for wind technology researchers. In their rush to bring these new components and systems to the marketplace, designers and developers should consider the lessons learned in the wind farms over the past 10 years. Experience has shown that a disciplined design approach is required that realistically accounts for the turbulence-induced loads, unsteady stall loading, and fatigue effects. This paper reviews past experiences and compares current modelling capabilities with experimental measurements in order to identify some of the knowledge gaps that challenge designers of advanced components and systems. 7 refs., 11 figs.

  4. Liquid-state theory of hydrocarbon-water systems: Application to methane, ethane, and propane

    SciTech Connect

    Lue, L.; Blankschtein, D.

    1992-10-15

    The authors studied the structural and bulk thermodynamic properties of hydrocarbon (methane, ethane, and propane)-water systems as well as pure water using the site-site Ornstein-Zernike (SSOZ) equation under a variety of different closure relations in order to compare the quantitative predictive capabilities of the various closures. For the hydrocarbon-water systems, the simple point-charge(SPC) potential was used to model water, and the optimized potentials for liquid, simulation (OPLS) were used to model the hydrocarbons. 69 refs., 11 figs., 8 tabs.

  5. Evaluation of military field-water quality

    SciTech Connect

    Daniels, J.I.; Anspaugh, L.R.; Layton, D.W.

    1990-01-01

    The purpose of this report is to develop drinking-water standards for field water for selected threat agents of concern, including radioactivity. The threat agents of concern in addition to radioactivity are the classical chemical-warfare compounds hydrogen cyanide, organophosphorus nerve agents, and lewisite, as well as a fungal metabolite identified only recently as a possible threat agent, the trichothecene mycotoxin. The recommended standards are applicable only to military personnel deployed in the field, and they are meant to protect against performance-degrading effects resulting from the ingestion of the substances in field water. 25 refs., 11 figs., 19 tabs.

  6. Interpretation of engine cycle-to-cycle variation by chaotic time series analysis

    SciTech Connect

    Daw, C.S.; Kahl, W.K.

    1990-01-01

    In this paper we summarize preliminary results from applying a new mathematical technique -- chaotic time series analysis (CTSA) -- to cylinder pressure data from a spark-ignition (SI) four-stroke engine fueled with both methanol and iso-octane. Our objective is to look for the presence of deterministic chaos'' dynamics in peak pressure variations and to investigate the potential usefulness of CTSA as a diagnostic tool. Our results suggest that sequential peak cylinder pressures exhibit some characteristic features of deterministic chaos and that CTSA can extract previously unrecognized information from such data. 18 refs., 11 figs., 2 tabs.

  7. Design considerations for multi component molecular-polymeric nonlinear optical materials

    SciTech Connect

    Singer, K.D. . Dept. of Physics); Kuzyk, M.G. . Dept. of Physics); Fang, T.; Holland, W.R. ); Cahill, P.A. )

    1990-01-01

    We review our work on multi component polymeric nonlinear optical materials. These materials consist of nonlinear optical molecules incorporated in a polymeric host. A cross-linked triazine polymer incorporating a dicyanovinyl terminated azo dye was found to be relatively stable at 85{degree} and posses an electro-optic coefficient of 11pm/V. We have also observed the zero dispersion condition in a new anomalous dispersion dye for phase matched second harmonic generation, and expect efficient conversion to the blue. A squarylium dye, ISQ, has been found to posses a large third order nonlinearity, and may display two-level behavior. 24 refs., 11 figs.

  8. Heat transfer assembly for a fluorescent lamp and fixture

    DOEpatents

    Siminovitch, M.J.; Rubenstein, F.M.; Whitman, R.E.

    1992-12-29

    In a lighting fixture including a lamp and a housing, a heat transfer structure is disclosed for reducing the minimum lamp wall temperature of a fluorescent light bulb. The heat transfer structure, constructed of thermally conductive material, extends from inside the housing to outside the housing, transferring heat energy generated from a fluorescent light bulb to outside the housing where the heat energy is dissipated to the ambient air outside the housing. Also disclosed is a method for reducing minimum lamp wall temperatures. Further disclosed is an improved lighting fixture including a lamp, a housing and the aforementioned heat transfer structure. 11 figs.

  9. Results of sludge slurry pipeline pluggage tests. [Simulation of Radioactive Slurry Flow

    SciTech Connect

    Fazio, J.M.

    1987-02-06

    Test results of sludge slurry transport through the Interarea Transfer Line (IAL) Mock-up Facility showed little risk of plugging the interarea pipelines with sludge slurry. Plug-free operation of the pipeline was successfully demonstrated by worst case IAL operating scenarios. Pipeline pressure gradients were measured vs. flow rate for comparison with a computer model over a range of sludge slurry rheological properties. A mathematical computer model developed by L. M. Lee is included in this report which will predict pressure drop for Bingham plastic fluid flow in a pipeline. IAL pluggage situations and pumping requirements may be realized from this model. 4 refs., 11 figs., 2 tabs.

  10. Method and apparatus for atomization and spraying of molten metals

    DOEpatents

    Hobson, D.O.; Alexeff, I.; Sikka, V.K.

    1988-07-19

    A method and device for dispersing molten metal into fine particulate spray, the method comprises applying an electric current through the molten metal and simultaneously applying a magnetic field to the molten metal in a plane perpendicular to the electric current, whereby the molten metal is caused to form into droplets at an angle perpendicular to both the electric current and the magnetic field. The device comprises a structure for providing a molten metal, appropriately arranged electrodes for applying an electric current through the molten metal, and a magnet for providing a magnetic field in a plane perpendicular to the electric current. 11 figs.

  11. Methane/nitrogen separation process

    DOEpatents

    Baker, R.W.; Lokhandwala, K.A.; Pinnau, I.; Segelke, S.

    1997-09-23

    A membrane separation process is described for treating a gas stream containing methane and nitrogen, for example, natural gas. The separation process works by preferentially permeating methane and rejecting nitrogen. The authors have found that the process is able to meet natural gas pipeline specifications for nitrogen, with acceptably small methane loss, so long as the membrane can exhibit a methane/nitrogen selectivity of about 4, 5 or more. This selectivity can be achieved with some rubbery and super-glassy membranes at low temperatures. The process can also be used for separating ethylene from nitrogen. 11 figs.

  12. Solar-induced chemical vapor deposition of diamond-type carbon films

    DOEpatents

    Pitts, J.R.; Tracy, C.E.; King, D.E.; Stanley, J.T.

    1994-09-13

    An improved chemical vapor deposition method for depositing transparent continuous coatings of sp[sup 3]-bonded diamond-type carbon films, comprises: (a) providing a volatile hydrocarbon gas/H[sub 2] reactant mixture in a cold wall vacuum/chemical vapor deposition chamber containing a suitable substrate for said films, at pressure of about 1 to 50 Torr; and (b) directing a concentrated solar flux of from about 40 to about 60 watts/cm[sup 2] through said reactant mixture to produce substrate temperatures of about 750 C to about 950 C to activate deposition of the film on said substrate. 11 figs.

  13. Method for chemical surface modification of fumed silica particles

    DOEpatents

    Grabbe, A.; Michalske, T.A.; Smith, W.L.

    1999-05-11

    Dehydroxylated, silica-containing, glass surfaces are known to be at least partially terminated by strained siloxane rings. According to the invention, a surface of this kind is exposed to a selected silane compound or mixture of silane compounds under reaction-promoting conditions. The ensuing reaction results in opening of the strained siloxane rings, and termination of surface atoms by chemical species, such as organic or organosilicon species, having desirable properties. These species can be chosen to provide qualities such as hydrophobicity, or improved coupling to a polymeric coating. 11 figs.

  14. Chemical treatment for silica-containing glass surfaces

    DOEpatents

    Grabbe, A.; Michalske, T.A.; Smith, W.L.

    1998-04-07

    Dehydroxylated, silica-containing, glass surfaces are known to be at least partially terminated by strained siloxane rings. According to the invention, a surface of this kind is exposed to a selected silane compound or mixture of silane compounds under reaction-promoting conditions. The ensuing reaction results in opening of the strained siloxane rings, and termination of surface atoms by chemical species, such as organic or organosilicon species, having desirable properties. These species can be chosen to provide qualities such as hydrophobicity, or improved coupling to a polymeric coating. 11 figs.

  15. Internal polarized targets

    SciTech Connect

    Kinney, E.R.; Coulter, K.; Gilman, R.; Holt, R.J.; Kowalczyk, R.S.; Napolitano, J.; Potterveld, D.H.; Young, L. ); Mishnev, S.I.; Nikolenko, D.M.; Popov, S.G.; Rachek, I.A.; Temnykh, A.B.; Toporkov, D.K.; Tsentalovich, E.P.; Wojtsekhowski, B.B. . Inst. Yadernoj Fiziki)

    1989-01-01

    Internal polarized targets offer a number of advantages over external targets. After a brief review of the basic motivation and principles behind internal polarized targets, the technical aspects of the atomic storage cell will be discussed in particular. Sources of depolarization and the means by which their effects can be ameliorated will be described, especially depolarization by the intense magnetic fields arising from the circulating particle beam. The experience of the Argonne Novosibirsk collaboration with the use of a storage cell in a 2 GeV electron storage ring will be the focus of this technical discussion. 17 refs., 11 figs.

  16. Hanford Waste Vitrification Plant technical background document for best available radionuclide control technology demonstration

    SciTech Connect

    Carpenter, A.B.; Skone, S.S.; Rodenhizer, D.G.; Marusich, M.V. )

    1990-10-01

    This report provides the background documentation to support applications for approval to construct and operate new radionuclide emission sources at the Hanford Waste Vitrification Plant (HWVP) near Richland, Washington. The HWVP is required to obtain permits under federal and state statutes for atmospheric discharges of radionuclides. Since these permits must be issued prior to construction of the facility, draft permit applications are being prepared, as well as documentation to support these permits. This report addresses the applicable requirements and demonstrates that the preferred design meets energy, environmental, and economic criteria for Best Available Radionuclide Control Technology (BARCT) at HWVP. 22 refs., 11 figs., 25 tabs.

  17. Limnology of Sawtooth Valley Lakes in 1995

    SciTech Connect

    Luecke, C.; Slater, M.; Budy, P.

    1996-05-01

    Included in this section of the report on limnology of Lakes in the Snake River Plain are descriptions of the limnological characteristics of the four lakes in reference to their potential effect of growth and survival of juvenile sockeye salmon. Physical parameters included light penetration, Secchi transparency, and water temperature; chemical parameters included oxygen, and both dissolved and particulate forms of nitrogen and phosphorus. Phytoplankton parameters included chlorophyll concentration, biovolume of dominant taxa, and rates of primary production; zooplankton parameters included density and biomass estimate, length frequencies, and the number of eggs carried by female cladocerans. 11 figs., 5 tabs.

  18. Apparatus for measuring particle properties

    DOEpatents

    Rader, D.J.; Castaneda, J.N.; Grasser, T.W.; Brockmann, J.E.

    1998-08-11

    An apparatus is described for determining particle properties from detected light scattered by the particles. The apparatus uses a light beam with novel intensity characteristics to discriminate between particles that pass through the beam and those that pass through an edge of the beam. The apparatus can also discriminate between light scattered by one particle and light scattered by multiple particles. The particle`s size can be determined from the intensity of the light scattered. The particle`s velocity can be determined from the elapsed time between various intensities of the light scattered. 11 figs.

  19. Toxicity assessment of Hanford Site wastes by bacterial bioluminescence. [Photobacter phosphoreum:a3

    SciTech Connect

    Rebagay, T.V.; Dodd, D.A.; Voogd, J.A.

    1991-09-01

    This paper examines the toxicity of the nonradioactive component of low-level wastes stored in tanks on the Hanford reservation. The use of a faster, cheaper bioassay to replace the 96 hour fish acute toxicity test is examined. The new bioassay is based on loss of bioluminescence of {und Photobacter phosphoreum} (commonly called Microtox) following exposure to toxic materials. This bioassay is calibrated and compares well to the standard fish acute toxicity test for characterization of Hanford Wastes. 4 refs., 11 figs., 11 tabs. (MHB)

  20. Photophysics and photochemistry of quantized ZnO colloids

    SciTech Connect

    Kamat, P.V.; Patrick, B.

    1992-08-06

    The photophysical and photochemical behavior of quantized ZnO colloids in ethanol has been investigated by time-resolved transient absorption and emission measurements. Trapping of electrons at the ZnO surface resulted in broad absorption in the red region. The green emission of ZnO colloids was readily quenched by hole scavengers such as SCN{sup -} and I{sup -}. The photoinduced charge transfer to these hole scavengers was studied by laser flash photolysis. The yield of oxidized product increased considerably when ZnO colloids were coupled with ZnSe. 36 refs., 11 figs., 1 tab.

  1. Inconsistencies in pedigree symbols in human genetics publications: A need for standardization

    SciTech Connect

    Steinhaus, K.A.; Bennett, R.L.; Resta, R.G.

    1995-04-10

    To determine consistency in usage of pedigree symbols by genetics professionals, we reviewed pedigrees printed in 10 human genetic and medical journals and 24 medical genetics textbooks. We found no consistent symbolization for common situations such as pregnancy, spontaneous abortion, death, or test results. Inconsistency in pedigree design can create difficulties in the interpretation of family studies and detract from the pedigree`s basic strength of simple and accurate communication of medical information. We recommend the development of standard pedigree symbols, and their incorporation into genetic publications, professional genetics training programs, pedigree software programs, and genetic board examinations. 5 refs., 11 figs., 2 tabs.

  2. Flue gas desulfurization wastewater treatment primer

    SciTech Connect

    Higgins, T.E.; Sandy, A.T.; Givens, S.W.

    2009-03-15

    Purge water from a typical wet flue gas desulfurization system contains myriad chemical constituents and heavy metals whose mixture is determined by the fuel source and combustion products as well as the stack gas treatment process. A well-designed water treatment system can tolerate upstream fuel and sorbent arranged in just the right order to produce wastewater acceptable for discharge. This article presents state-of-the-art technologies for treating the waste water that is generated by wet FGD systems. 11 figs., 3 tabs.

  3. Particulate emissions from residential wood combustion: Final report: Norteast regional Biomass Program

    SciTech Connect

    Not Available

    1987-01-01

    The objective of this study was to provide a resource document for the Northeastern states when pursuing the analysis of localized problems resulting from residential wood combustion. Specific tasks performed include assigning emission rates for total suspended particulates (TSP) and benzo(a)pyrene (BaP) from wood burning stoves, estimating the impact on ambient air quality from residential wood combustion and elucidating the policy options available to Northeastern states in their effort to limit any detrimental effects resulting from residential wood combustion. Ancillary tasks included providing a comprehensive review on the relevant health effects, indoor air pollution and toxic air pollutant studies. 77 refs., 11 figs., 25 tabs.

  4. Preparative-scale proteins seperations by continuous annular chromatography

    SciTech Connect

    Bloomingburg, G.F.; Bauer, J.S.; Carta, G.; Byers, C.H. . Dept. of Chemical Engineering; Oak Ridge National Lab., TN )

    1989-01-01

    The use of continuous annular chromatography (CAC) for the separation of protein mixtures is studied in a preparative-scale CAC unit. S-Sepharose, a strong-acid porous cation exchange resin is used as the separation medium mixtures of albumin, hemoglobin, and cytochrome-C are used as a model separation system. Equilibrium and mass transfer parameter are developed for this system on the basis of fixed-bed chromatograph experiments. A mathematical model is then successfully used in conjunction with these parameters to simulate the performance of the CAC separations. 11 refs., 11 figs., 3 tabs.

  5. Wide band cryogenic ultra-high vacuum microwave absorber

    DOEpatents

    Campisi, I.E.

    1992-05-12

    An absorber waveguide assembly for absorbing higher order modes of microwave energy under cryogenic ultra-high vacuum conditions, that absorbs wide-band multi-mode energy. The absorber is of a special triangular shape, made from flat tiles of silicon carbide and aluminum nitride. The leading sharp end of the absorber is located in a corner of the waveguide and tapers to a larger cross-sectional area whose center is located approximately in the center of the wave guide. The absorber is relatively short, being of less height than the maximum width of the waveguide. 11 figs.

  6. Increasing jet entrainment, mixing and spreading

    DOEpatents

    Farrington, R.B.

    1994-08-16

    A free jet of air is disturbed at a frequency that substantially matches natural turbulences in the free jet to increase the entrainment, mixing, and spreading of air by the free jet, for example in a room or other enclosure. The disturbances are created by pulsing the flow of air that creates the free jet at the desired frequency. Such pulsing of the flow of air can be accomplished by sequentially occluding and opening a duct that confines and directs the flow of air, such as by rotating a disk on an axis transverse to the flow of air in the duct. 11 figs.

  7. Cavitation-resistant inducer

    DOEpatents

    Dunn, C.; Subbaraman, M.R.

    1989-06-13

    An improvement in an inducer for a pump is disclosed wherein the inducer includes a hub, a plurality of radially extending substantially helical blades and a wall member extending about and encompassing an outer periphery of the blades. The improvement comprises forming adjacent pairs of blades and the hub to provide a substantially rectangular cross-sectional flow area which cross-sectional flow area decreases from the inlet end of the inducer to a discharge end of the inducer, resulting in increased inducer efficiency improved suction performance, reduced susceptibility to cavitation, reduced susceptibility to hub separation and reduced fabrication costs. 11 figs.

  8. Influence of measurement geometry on the estimate of {sup 131}I activity in the thyroid: Monte Carlo simulation of a detector and a phantom

    SciTech Connect

    Ulanovsky, A.V.; Minenko, V.F.; Korneev, S.V.

    1997-01-01

    An approach for evaluating the influence of measurement geometry on estimates of {sup 131}I in the thyroid from measurements with survey meters was developed using Monte Carlo simulation of radiation transport in the human body and the radiation detector. The modified Monte Carlo code, EGS4, including a newly developed mathematical model of detector, thyroid gland, and neck, was used for the computations. The approach was tested by comparing calculated and measured differential and integral detector characteristics. This procedure was applied to estimate uncertainties in direct thyroid-measurement results due to geometrical errors. 14 refs., 11 figs., 4 tabs.

  9. Positronium reflection and positronium beams

    SciTech Connect

    Weber, M.; Tang, S.; Khatri, R.; Roellig, L.O.; Viescas, A.J. ); Berko, S.; Canter, K.F. ); Lynn, K.G. ); Mills, A.P. Jr. )

    1989-01-01

    We have observed specular reflection of positronium, Ps, and established that there is adequate intensity at higher energies to make further study worthwhile. The scattering appears to be restricted to the outermost surface with a mean free path of (0.75 {plus minus} 0.15){Angstrom} for Ps in LiF(100). With a greater intensity Ps beam one should see higher order diffraction beams as the result of the periodicity of the surface. Ps diffraction thus offers the possibility of being a novel and valuable probe to study the outermost surface and to study adsorbents on it. Two methods for producing Ps beams are described. 29 refs., 11 figs.

  10. Design of a field experiment for injection of natural colloids in a sandy coastal plain aquifer, Belle W. Baruch Forest Science Institute, Georgetown, South Carolina

    SciTech Connect

    Toran, L.E.; McCarthy, J.F. ); Williams, T.M. . Belle W. Baruch Forest Science Inst.)

    1990-06-01

    This report summarizes the design of field injection experiments that constitute one task in the larger project described in the report Experiments Using Natural Organics.'' In the experiment, we plan to inject a large volume of colloidal organic matter (COM) into a sandy, unconsolidated coastal aquifer and observe the migration of COM into the groundwater flow system. The report provides a brief overview of the research project, including hypotheses to be tested; describes the purpose of the field injection experiments; summarizes the site characterization preliminary to the experiments; and explains the design of the experiments. 11 figs., 5 tabs.

  11. Method and apparatus for the evaluation of a depth profile of thermo-mechanical properties of layered and graded materials and coatings

    DOEpatents

    Finot, M.; Kesler, O.; Suresh, S.

    1998-12-08

    A technique for determining properties such as Young`s modulus, coefficient of thermal expansion, and residual stress of individual layers within a multi-layered sample is presented. The technique involves preparation of a series of samples, each including one additional layer relative to the preceding sample. By comparison of each sample to a preceding sample, properties of the topmost layer can be determined, and residual stress at any depth in each sample, resulting from deposition of the top layer, can be determined. 11 figs.

  12. SANS studies of micellar and magnetic fluids

    SciTech Connect

    Hayter, J.B,

    1985-08-01

    Small-angle neutron scattering (SANS) has proved to be an excellent technique for the study of complex fluids. This article introduces SANS from the viewpoint of such studies. The use of SANS to determine the structures of concentrated micellar fluids is then discussed within the framework of current one-component macrofluid (OCM) models, and experimental examples are taken from several contemporary studies. Finally, the discussion is extended to magnetic fluids (ferrofluids) in which the neutron magnetic interaction plays an important experimental role. 25 refs., 11 figs., 1 tab.

  13. Feed-forward digital phase and amplitude correction system

    DOEpatents

    Yu, D.U.L.; Conway, P.H.

    1994-11-15

    Phase and amplitude modifications in repeatable RF pulses at the output of a high power pulsed microwave amplifier are made utilizing a digital feed-forward correction system. A controlled amount of the output power is coupled to a correction system for processing of phase and amplitude information. The correction system comprises circuitry to compare the detected phase and amplitude with the desired phase and amplitude, respectively, and a digitally programmable phase shifter and attenuator and digital logic circuitry to control the phase shifter and attenuator. The phase and amplitude of subsequent are modified by output signals from the correction system. 11 figs.

  14. Polymeric electrolytes for ambient temperature lithium batteries

    SciTech Connect

    Farrington, G.C. . Dept. of Materials Science and Engineering)

    1991-07-01

    A new type of highly conductive Li{sup +} polymer electrolyte, referred to as the Innovision polymer electrolyte, is completely amorphous at room temperature and has an ionic conductivity in the range of 10{sup {minus}3} S/cm. This report discusses the electrochemical characteristics (lithium oxidation and reduction), conductivity, and physical properties of Innovision electrolytes containing various dissolved salts. These electrolytes are particularly interesting since they appear to have some of the highest room-temperature lithium ion conductivities yet observed among polymer electrolytes. 13 refs. 11 figs., 2 tabs.

  15. Mouse T-cell receptor variable gene segment families

    SciTech Connect

    Arden, B.; Kabelitz, D.; Clark, S.P.; Mak, T.W.

    1995-10-01

    All mouse T-cell receptor {alpha}/{delta}, {beta}, and {gamma} variable (Tcra/d-, b-, and g-V) gene segments were aligned to compare the sequences with one another, to group them into subfamilies, and to derive a name which complies with the standard nomenclature. it was necessary to change the names of some V gene segments because they conflicted with those of other segments. The traditional classification into subfamilies was re-evaluated using a much larger pool of sequences. In the mouse, most V gene segments can be grouped into subfamilies of closely related genes with significantly less similarity between different subfamilies. 118 refs., 11 figs., 4 tabs.

  16. Collisionally induced stochastic dynamics of fast ions in solids

    SciTech Connect

    Burgdoerfer, J.

    1989-01-01

    Recent developments in the theory of excited state formation in collisions of fast highly charged ions with solids are reviewed. We discuss a classical transport theory employing Monte-Carlo sampling of solutions of a microscopic Langevin equation. Dynamical screening by the dielectric medium as well as multiple collisions are incorporated through the drift and stochastic forces in the Langevin equation. The close relationship between the extrinsically stochastic dynamics described by the Langevin and the intrinsic stochasticity in chaotic nonlinear dynamical systems is stressed. Comparison with experimental data and possible modification by quantum corrections are discussed. 49 refs., 11 figs.

  17. Site Study Plan for background environmental radioactivity, Deaf Smith County site, Texas: Environmental Field Program: Preliminary draft

    SciTech Connect

    Not Available

    1987-06-01

    The Background Environmental Radioactivity Site Study Plan describes a field program consisting of an initial radiological survey and a radiological sampling program. The field program includes measurement of direct radiation and collection and analysis of background radioactivity samples of air, precipitation, soil, water, milk, pasture grass, food crops, meat, poultry, game, and eggs. The plan describes for each study: the need for the study, the study design, data management and use, schedule of proposed activities, and quality assurance requirements. These studies will provide data needed to satisfy requirements contained in, or derived from, the Salt Repository Project (SRP) Requirements Document. 50 refs., 11 figs., 7 tabs.

  18. Correlation of chromosome patterns in human leukemic cells with exposure to chemicals and/or radiation

    SciTech Connect

    Rowley, J.D.

    1992-06-01

    This project seeks to defining the chromosome segments associated with radiation induced leukemogenesis (treatment-related acute myeloid leukemia, or t-AML). Towards these goals genetic analysis of human chromosomes 5 and 7 continues to investigate correlation of treatment with balanced and unbalanced chromosomal translocations. Progress is being made in cloning the breakpoints in balanced translocations in t-AML, that is to clone the t(9;11) and t(11;19) breakpoints, to clone the t(3;21)(q26;q22) breakpoints and to determine the relationship of these translocations to prior exposure to topoisomerase II inhibitors. 11 figs. 3 figs.

  19. Correlation of chromosome patterns in human leukemic cells with exposure to chemicals and/or radiation. Comprehensive progress report, July 1991--June 1992

    SciTech Connect

    Rowley, J.D.

    1992-06-01

    This project seeks to defining the chromosome segments associated with radiation induced leukemogenesis (treatment-related acute myeloid leukemia, or t-AML). Towards these goals genetic analysis of human chromosomes 5 and 7 continues to investigate correlation of treatment with balanced and unbalanced chromosomal translocations. Progress is being made in cloning the breakpoints in balanced translocations in t-AML, that is to clone the t(9;11) and t(11;19) breakpoints, to clone the t(3;21)(q26;q22) breakpoints and to determine the relationship of these translocations to prior exposure to topoisomerase II inhibitors. 11 figs. 3 figs.

  20. Method and apparatus for imparting strength to a material using sliding loads

    DOEpatents

    Hughes, D.A.; Dawson, D.B.; Korellis, J.S.

    1999-03-16

    A method of enhancing the strength of metals by affecting subsurface zones developed during the application of large sliding loads is disclosed. Stresses which develop locally within the near surface zone can be many times larger than those predicted from the applied load and the friction coefficient. These stress concentrations arise from two sources: (1) asperity interactions and (2) local and momentary bonding between the two surfaces. By controlling these parameters more desirable strength characteristics can be developed in weaker metals to provide much greater strength to rival that of steel, for example. 11 figs.

  1. Membrane stabilizer

    DOEpatents

    Mingenbach, W.A.

    1988-02-09

    A device is provided for stabilizing a flexible membrane secured within a frame, wherein a plurality of elongated arms are disposed radially from a central hub which penetrates the membrane, said arms imposing alternately against opposite sides of the membrane, thus warping and tensioning the membrane into a condition of improved stability. The membrane may be an opaque or translucent sheet or other material. 10 figs.

  2. Vaccine to Control the Viral Infection of Fish.

    DOEpatents

    Leong, JoAnn Ching

    1994-10-11

    Subunit vaccines and their use for immunizing fish against infection by viruses are disclosed. In particular, plasmid pG8 is constructed by joining, with the plasmid pUC8, DNA which encodes the glycoprotein of infectious hematopoietic necrosis virus (IHNV). E. coli cells are transformed by pG8, whereby pure viral antigen is produced to provide a vaccine for the control of IHNV in fish. 10 figs.

  3. Airfoils for wind turbine

    DOEpatents

    Tangler, J.L.; Somers, D.M.

    1996-10-08

    Airfoils are disclosed for the blade of a wind turbine wherein each airfoil is characterized by a thickness in a range from 16%-24% and a maximum lift coefficient designed to be largely insensitive to roughness effects. The airfoils include a family of airfoils for a blade 15 to 25 meters in length, a family of airfoils for a blade 1 to 5 meters in length, and a family of airfoils for a blade 5 to 10 meters in length. 10 figs.

  4. Catalytic distillation structure

    DOEpatents

    Smith, L.A. Jr.

    1984-04-17

    Catalytic distillation structure is described for use in reaction distillation columns, and provides reaction sites and distillation structure consisting of a catalyst component and a resilient component intimately associated therewith. The resilient component has at least about 70 volume % open space and is present with the catalyst component in an amount such that the catalytic distillation structure consists of at least 10 volume % open space. 10 figs.

  5. Combined electrophoresis-electrospray interface and method

    DOEpatents

    Smith, R.D.; Udseth, H.R.; Barinaga, C.J.

    1995-06-13

    An improvement to the system and method is disclosed for analyzing molecular constituents of a composition sample that comprises improvements to an electrospray ionization source for interfacing to mass spectrometers and other detection devices. The improvement consists of establishing a unique electrical circuit pattern and nozzle configuration, a metallic coated and conical shaped capillary outlet, coupled with sizing of the capillary to obtain maximum sensitivity. 10 figs.

  6. Dyes designed for high sensitivity detection of double-stranded DNA

    DOEpatents

    Glazer, A.N.; Benson, S.C.

    1998-07-21

    Novel fluorescent dyes are provided, characterized by having a fluorophore joined to a cationic chain. The dyes are found to provide for high enhancement upon binding to nucleic acid and have strong binding affinities to the nucleic acid, as compared to the fluorophore without the polycationic chain. The dyes find use in detection of dsDNA in gel electrophoresis and solution at substantially higher sensitivities using substantially less dye. 10 figs.

  7. Rollfix---An adiabatic roll transition for the SLC (Stanford Linear Collider) Arcs

    SciTech Connect

    Bambade, P.; Brown, K.; Fieguth, T.; Hutton, A.; Ritson, D.; Sands, M.; Toge, N.

    1989-02-01

    The SLC Arcs were rolled at achromat boundaries to follow the terrain of the SLAC site. This makes the linear optics sensitive to systematic gradient errors, from which severe cross-plane coupling effects may arise. As a partial correction, a smoother roll transition was introduced which relieves much of this sensitivity. We present an evaluation of this scheme and report on the observed improvements. 18 refs., 10 figs.

  8. Ultrasensitive fluorescence detection of DNA sequencing gels

    SciTech Connect

    Mathies, R.A.

    1991-01-01

    During the three years of this grant we have: (1) Developed and applied a new theory for optimizing high-sensitivity fluorescence detection. (2) Developed and patented a new high-sensitivity confocal-fluorescence laser-excited gel-scanner. (3) Applied this scanner to the development of a new class of versatile and sensitive fluorescent dyes for DNA detection. (4) Developed methods for the detection of single fluorescent molecules by fluorescence burst detection. 11 refs., 10 figs.

  9. 3D thermal stress analysis of WIPP (Waste Isolation Pilot Plant) Room T RH TRU (Remote Handled Transuranic) experiments

    SciTech Connect

    Argueello, J.G.; Beraun, R.; Molecke, M.A.

    1989-08-01

    A three-dimensional finite element thermal stress analysis of the RH TRU experiments in WIPP Room T has been performed. This analysis aids in the interpretation of the borehole closure results being obtained from the Room T experiments and helps in assessing potential performance impacts in a typical storage room, during the waste retrieval period. Computed results are presented and compared to available in situ data, and a qualitative agreement between measured and computed closures is seen. 9 refs., 10 figs.

  10. Method for measuring the drift mobility in doped semiconductors

    DOEpatents

    Crandall, R.S.

    1982-03-09

    A method for measuring the drift mobility of majority carriers in semiconductors consists of measuring the current transient in a Schottky-barrier device following the termination of a forward bias pulse. An example is given using an amorphous silicon hydrogenated material doped with 0.2% phosphorus. The method is particularly useful with material in which the dielectric relaxation time is shorter than the carrier transit time. It is particularly useful in material useful in solar cells. 10 figs.

  11. Neutronic analysis of the JMTR with LEU fuel and burnable poison

    SciTech Connect

    Nagaoka, Yoshiharu; Oyamada, Rokuro; Matos, J.E.; Woodruff, W.L.

    1984-01-01

    The results of neutronics calculations are presented for the JMTR equilibrium core with LEU silicide fuel, boron and cadmium burnable poisons in the sideplates, and a cycle length of 24 days instead of 11 days with the current HEU fuel. The data indicate that several options are feasible provided that silicide fuels with high uranium densities are successfully demonstrated and licensed. 2 refs., 10 figs., 5 tabs.

  12. Bringing robotics technology down to Earth

    SciTech Connect

    Fuller, B.R.

    1997-03-01

    Robotics technology is successfully being transitioned from space to terrestrial applications. It is being modified and enhanced to help in the US DOE`s Environmental Restoration and Waste Management Program. Some examples of these applications, ranging from large multijointed manipulators to autonomously navigated remote vehicles, are outlined in this article. They include the following: underground storage tank technology demonstration; light-duty utility arm system; remotely controlled material-handling system; remotely operated excavator; self-guided transfer vehicle. 10 figs.

  13. Recent experiments in novel nuclear excitations at the BNL AGS

    SciTech Connect

    Chrien, R.E.

    1988-01-01

    Recent experimental work at the AGS dealing with unusual nuclear excitations is summarized. Three examples are given: the deexcitation of ..lambda.. hypernuclei by ..gamma.. transitions, the production of ..lambda.. hypernuclei by the (..pi../sup +/,K/sup +/) reaction, and the search for /eta/-nuclear excitations. The status of each field and the implications of the research for nuclear theory are discussed. 11 refs., 10 figs., 1 tab.

  14. Analysis of two-well tracer tests with a pulse input

    SciTech Connect

    Gelhar, L.W.; Leonhart, L.S.

    1982-04-01

    Dispersion of a conservative solute which is introduced as a pulse in the recharge well of a two-well flow system is analyzed using the general theory for longitudinal dispersion in nonuniform flow a long streamlines. Results for the concentration variation at the pumping well are developed using numerical integration and are presented in the form of dimensionless type-curves which can be used to design and analyze tracer tests. 6 refs., 10 figs.

  15. Non-lead environmentally safe projectiles and explosive container

    DOEpatents

    Lowden, R.A.; McCoig, T.M.; Dooley, J.B.; Smith, C.M.

    1999-06-15

    A solid object having controlled frangibility, such as a bullet or a container for explosives, is made by combining two different metals in proportions calculated to achieve a desired density, without using lead. A wetting material is deposited on the base constituent which is made of a relative dense, hard material. The wetting material enhances the wettability of the base constituent with the binder constituent, which is lighter and softer than the base constituent. 10 figs.

  16. Tracking and vertex finding with drift chambers and neural networks

    SciTech Connect

    Lindsey, C.

    1991-09-01

    Finding tracks, track vertices and event vertices with neural networks from drift chamber signals is discussed. Simulated feed-forward neural networks have been trained with back-propagation to give track parameters using Monte Carlo simulated tracks in one case and actual experimental data in another. Effects on network performance of limited weight resolution, noise and drift chamber resolution are given. Possible implementations in hardware are discussed. 7 refs., 10 figs.

  17. Review of total cross sections and forward scattering parameters at ultra-high energies

    SciTech Connect

    Block, M.M.; White, A.R.

    1991-10-01

    We review the field of the elastic scattering of pp and {bar p}p at the ultra-high energies. The recent total cross section, {sigma}{sub tot}, and {rho}-value results from the Fermilab Tevatron Collider experiments presented at the 4th `Blois` Workshop on Elastic and Diffractive Scattering (Elba, Italy, in May, 1991), allow us a comprehensive overview of the field. 24 refs., 10 figs., 3 tabs.

  18. Review of total cross sections and forward scattering parameters at ultra-high energies

    SciTech Connect

    Block, M.M. . Dept. of Physics and Astronomy); White, A.R. . High Energy Physics Div.)

    1991-10-01

    We review the field of the elastic scattering of pp and {bar p}p at the ultra-high energies. The recent total cross section, {sigma}{sub tot}, and {rho}-value results from the Fermilab Tevatron Collider experiments presented at the 4th Blois' Workshop on Elastic and Diffractive Scattering (Elba, Italy, in May, 1991), allow us a comprehensive overview of the field. 24 refs., 10 figs., 3 tabs.

  19. Radio frequency heating for in-situ remediation of DNAPL

    SciTech Connect

    Kasevich, R.S.

    1996-08-01

    In-situ radio frequency (RF) heating technology for treating soils contaminated with dense nonaqueous phase liquids (DNAPLs) is described. RF imparts heat to non-conducting materials through the application of carefully controlled RF transmissions, improving contaminant flow characteristics and facilitating separation and removal from subsurface soils. The paper outlines advantages and limitations of RF remediation, process operations, general technology considerations, low permeability media considerations, commercial availability, and costs. Two case histories of RF remediation are briefly summarized. 13 refs., 10 figs.

  20. Fuel bundle design for enhanced usage of plutonium fuel

    DOEpatents

    Reese, A.P.; Stachowski, R.E.

    1995-08-08

    A nuclear fuel bundle includes a square array of fuel rods each having a concentration of enriched uranium and plutonium. Each rod of an interior array of the rods also has a concentration of gadolinium. The interior array of rods is surrounded by an exterior array of rods void of gadolinium. By this design, usage of plutonium in the nuclear reactor is enhanced. 10 figs.

  1. Pressure-sensitive optrode

    DOEpatents

    Hirschfeld, T.B.

    1986-07-15

    An apparatus is provided for sensing changes in pressure and for generating optical signals related to said changes in pressure. Light from a fiber optic illuminates a fluorescent composition causing it to fluoresce. The fluorescent composition is caused to fluoresce more relative to the end of the fiber optic in response to changes in pressure so that the intensity of fluorescent emissions collected by the same fiber optic used for illumination varies monotonically with pressure. 10 figs.

  2. Fundamental quantitative analysis of microbial activity in aquifer bioreclamation

    SciTech Connect

    Rittmann, B.E.; Valocchi, A.J. . Dept. of Civil Engineering); Baveye, P. . Dept. of Agronomy)

    1990-01-01

    Research continued on aquifer bioreclamation. The project has four primary areas: (1) biodegradation of poorly soluble organic contaminants, (2) dual-limitation kinetics of electron donors and acceptors, (3) two-dimensional modeling of biofilm reactions in nonhomogeneous porous media, and (4) biologically induced clogging in porous media. For each area, this report gives a brief summary of the first year's progress, report this quarter's progress in detail, and indicate plans for future work. 25 refs., 10 figs., 14 tabs.

  3. Membrane-augmented cryogenic methane/nitrogen separation

    DOEpatents

    Lokhandwala, K.

    1997-07-15

    A membrane separation process is described which is combined with a cryogenic separation process for treating a gas stream containing methane, nitrogen and at least one other component. The membrane separation process works by preferentially permeating methane and the other component and rejecting nitrogen. The process is particularly useful in removing components such as water, carbon dioxide or C{sub +2} hydrocarbons that might otherwise freeze and plug the cryogenic equipment. 10 figs.

  4. Diamond film growth from fullerene precursors

    DOEpatents

    Gruen, D.M.; Liu, S.; Krauss, A.R.; Pan, X.

    1997-04-15

    A method and system are disclosed for manufacturing diamond film. The method involves forming a fullerene vapor, providing a noble gas stream and combining the gas with the fullerene vapor, passing the combined fullerene vapor and noble gas carrier stream into a chamber, forming a plasma in the chamber causing fragmentation of the fullerene and deposition of a diamond film on a substrate. 10 figs.

  5. Polarization-balanced beamsplitter

    DOEpatents

    Decker, D.E.

    1998-02-17

    A beamsplitter assembly is disclosed that includes several beamsplitter cubes arranged to define a plurality of polarization-balanced light paths. Each polarization-balanced light path contains one or more balanced pairs of light paths, where each balanced pair of light paths includes either two transmission light paths with orthogonal polarization effects or two reflection light paths with orthogonal polarization effects. The orthogonal pairing of said transmission and reflection light paths cancels polarization effects otherwise caused by beamsplitting. 10 figs.

  6. Applications of a fingertip sensor for the Salisbury Robot Hand

    SciTech Connect

    Brock, D.L. . Artificial Intelligence Lab.)

    1989-11-01

    This report summarizes work performed on tasks 1 through 3 under Sandia Contract Number 75-2608. Task 1 involves a description of the sensor, its development and performance. Task 2 extends sensor applications to friction measurement and slip detection. Task 3 is an analysis of simple grasping reflexes particularly related to physical characteristics of the object and the manipulator. 9 refs., 10 figs., 1 tab.

  7. A bipartite operator interacts with a heat shock element to mediate early meiotic induction of Saccharomyces cerevisiae HSP82

    SciTech Connect

    Szent-Gyorgyi, C.

    1995-12-01

    This report seeks to characterize the activation of meiotic gene in terms of cis-acting DNA elements and their associated factors in Saccharomyces cerevisiae. It was found that vegetative repression and meiotic induction depend on interactions of the promoter-proximal heat shock element with a nearby bipartite repression element. The experiments described explore how two different regulatory pathways induce transcription by stimulating a single classical activation element, a nonspecific heat shock element. 81 refs., 10 figs., 1 tab.

  8. Surveillance of industrial processes with correlated parameters

    DOEpatents

    White, A.M.; Gross, K.C.; Kubic, W.L.; Wigeland, R.A.

    1996-12-17

    A system and method for surveillance of an industrial process are disclosed. The system and method includes a plurality of sensors monitoring industrial process parameters, devices to convert the sensed data to computer compatible information and a computer which executes computer software directed to analyzing the sensor data to discern statistically reliable alarm conditions. The computer software is executed to remove serial correlation information and then calculate Mahalanobis distribution data to carry out a probability ratio test to determine alarm conditions. 10 figs.

  9. Digital radiography: Present detectors and future developments

    SciTech Connect

    Perez-Mendez, V.

    1990-08-01

    Present detectors for digital radiography are of two classes: real time detectors and storage (non real time) types. Present real time detectors consist of image intensifier tubes with an internal cesium iodide layer x-ray converter. Non real time detectors involve linear sweep arrays or storage detectors such as film. Future detectors discussed here can be of both types utilizing new technologies such as hydrogenated amorphous silicon photodiode arrays coupled to thin film transistor arrays. 17 refs., 10 figs.

  10. An evaluation of methodology for seismic qualification of equipment, cable trays, and ducts in ALWR plants by use of experience data

    SciTech Connect

    Bandyopadhyay, K.K.; Kana, D.D.; Kennedy, R.P.; Schiff, A.J.

    1997-07-01

    Advanced Reactor Corporation (ARC) has developed a methodology for seismic qualification of equipment, cable trays and ducts in Advanced Light Water Reactor plants. A Panel (members of which acted as individuals) supported by the Office of Nuclear Regulatory Research of the Nuclear Regulatory Commission has evaluated this methodology. The review approach and observations are included in this report. In general, the Panel supports the ARC methodology with some exceptions and provides recommendations for further improvements. 26 refs., 10 figs., 1 tab.

  11. Thermionic converter

    DOEpatents

    Fitzpatrick, G.O.

    1987-05-19

    A thermionic converter is set forth which includes an envelope having an electron collector structure attached adjacent to a wall. An electron emitter structure is positioned adjacent the collector structure and spaced apart from opposite wall. The emitter and collector structures are in a common chamber. The emitter structure is heated substantially only by thermal radiation. Very small interelectrode gaps can be maintained utilizing the thermionic converter whereby increased efficiency results. 10 figs.

  12. Permanent magnet edge-field quadrupole

    DOEpatents

    Tatchyn, R.O.

    1997-01-21

    Planar permanent magnet edge-field quadrupoles for use in particle accelerating machines and in insertion devices designed to generate spontaneous or coherent radiation from moving charged particles are disclosed. The invention comprises four magnetized rectangular pieces of permanent magnet material with substantially similar dimensions arranged into two planar arrays situated to generate a field with a substantially dominant quadrupole component in regions close to the device axis. 10 figs.

  13. Oscilloscope photography at NTS (Nevada Test Site)

    SciTech Connect

    Robertson, C.E.

    1990-06-01

    High-quality recording of an oscilloscope waveform is usually made on photographic film. Achieving high quality, especially in a possible radiation environment and with fast sweep speeds, requires a thorough understanding of all aspects of the imaging and recording processes. This paper represents a compilation of techniques and procedures to achieve optimum oscilloscope imagery under adverse conditions and in an environment where unwanted radiation is a possibility. 10 figs., 1 tab.

  14. Method and apparatus for increasing the durability and yield of thin film photovoltaic devices

    DOEpatents

    Phillips, J.E.; Lasswell, P.G.

    1987-02-03

    Thin film photovoltaic cells having a pair of semiconductor layers between an opaque and a transparent electrical contact are manufactured in a method which includes the step of scanning one of the semiconductor layers to determine the location of any possible shorting defect. Upon the detection of such defect, the defect is eliminated to increase the durability and yield of the photovoltaic device. 10 figs.

  15. Dechlorination of TCE with palladized iron

    DOEpatents

    Fernando, Q.; Muftikian, R.; Korte, N.

    1997-04-01

    The present invention relates to various methods, such as an above-ground method and an in-ground method, of using a palladized iron bimetallic system for the dechlorination of chlorinated organic compounds from various effluents or contaminated soil containing the same. The use of palladized iron bimetallic system results in the dechlorination of the chlorinated organic compound into environmentally safe reaction products. 10 figs.

  16. Variable pressure thermal insulating jacket

    DOEpatents

    Nelson, P.A.; Malecha, R.F.; Chilenskas, A.A.

    1994-09-20

    A device for controlled insulation of a thermal device is disclosed. The device includes a thermal jacket with a closed volume able to be evacuated to form an insulating jacket around the thermal source. A getter material is in communication with the closed volume of the thermal jacket. The getter material can absorb and desorb a control gas to control gas pressure in the volume of the thermal jacket to control thermal conductivity in the thermal jacket. 10 figs.

  17. New particle searches at PEP

    SciTech Connect

    Berley, D.; Bulos, F.; Cheng, D.; Cork, B.; Limon, P.; Litke, A.; Nauenberg, U.; Rosen, J.; Shen, B.; Sulak, L.

    1988-01-01

    The new particles that could be produced at PEP are discussed in terms of their specific signatures and production rates. We find that a small number of general signatures characterize these particles. Backgrounds associated with the general signatures are considered and necessary rejection rates are calculated. We describe several typical detectors and tabulate the requirements they place on the PEP machine and the experimental areas. 10 figs., 2 tabs.

  18. Draft Level 1 Remedial Investigation Work Plan: 316-3 waste disposal trenches

    SciTech Connect

    Not Available

    1987-09-01

    This work plan describes the work to be performed for the initial level of site characterization for the 316.3 Trenches at the Hanford Site. This initial site characterization effort will include a review of existing environmental contamination data for the 300 Area as well as collection and analysis of environmental samples to better characterize subsurface contamination at the site. 7 refs., 10 figs., 7 tabs.

  19. Spent nuclear fuel discharges from U.S. reactors 1994

    SciTech Connect

    1996-02-01

    Spent Nuclear Fuel Discharges from US Reactors 1994 provides current statistical data on fuel assemblies irradiated at commercial nuclear reactors operating in the US. This year`s report provides data on the current inventories and storage capacities at these reactors. Detailed statistics on the data are presented in four chapters that highlight 1994 spent fuel discharges, storage capacities and inventories, canister and nonfuel component data, and assembly characteristics. Five appendices, a glossary, and bibliography are also included. 10 figs., 34 tabs.

  20. Test plan for In Situ Vitrification Engineering-Scale Test No. 6, EG G Idaho, Inc. , Job Number 318230

    SciTech Connect

    Not Available

    1991-03-01

    The objectives of the test included the effects of in situ vitrification on containerized sludge contained in a simulated randomly-disposed array. From this arrangement, the test results obtained the following data applicable to Idaho National Engineering Laboratory Large Field Testing: canister burst pressure and temperature, canister depressurization rate, melt encapsulation rate of the canister and the hood area plenum temperatures, pressures, compositional analyses, and flows as affected by gas releases. 10 figs., 1 tab.

  1. Observations of prolonged ionospheric anomalies following passage of an infrasound pulse through the lower thermosphere

    SciTech Connect

    Jacobson, A.R.; Carlos, R.C.

    1987-06-01

    We have studied the Doppler spectra of E-layer vertical-incidence HF soundings around the time of passage of a brief (duration approx.10 s) acoustic shock. Following the exit of the shock from the reflection volume, there occurred a several-minute episode of spectral derangement. We have analyzed this derangement in some detail and have related it to other studies of possibly the same phenomenon. 18 refs., 10 figs.

  2. Electrochemical cell and separator plate thereof

    DOEpatents

    Baker, Bernard S.; Dharia, Dilip J.

    1979-10-02

    A fuel cell includes a separator plate having first and second flow channels extending there through contiguously with an electrode and respectively in flow communication with the cell electrolyte and in flow isolation with respect to such electrolyte. In fuel cell system arrangement, the diverse type channels are supplied in common with process gas for thermal control purposes. The separator plate is readily formed by corrugation of integral sheet material. 10 figs.

  3. High conductivity composite metal

    DOEpatents

    Zhou, R.; Smith, J.L.; Embury, J.D.

    1998-01-06

    Electrical conductors and methods of producing them are disclosed, where the conductors possess both high strength and high conductivity. Conductors are comprised of carbon steel and a material chosen from a group consisting of copper, nickel, silver, and gold. Diffusion barriers are placed between these two materials. The components of a conductor are assembled and then the assembly is subjected to heat treating and mechanical deformation steps. 10 figs.

  4. Assessment of seismic margin calculation methods

    SciTech Connect

    Kennedy, R.P.; Murray, R.C.; Ravindra, M.K.; Reed, J.W.; Stevenson, J.D.

    1989-03-01

    Seismic margin review of nuclear power plants requires that the High Confidence of Low Probability of Failure (HCLPF) capacity be calculated for certain components. The candidate methods for calculating the HCLPF capacity as recommended by the Expert Panel on Quantification of Seismic Margins are the Conservative Deterministic Failure Margin (CDFM) method and the Fragility Analysis (FA) method. The present study evaluated these two methods using some representative components in order to provide further guidance in conducting seismic margin reviews. It is concluded that either of the two methods could be used for calculating HCLPF capacities. 21 refs., 9 figs., 6 tabs.

  5. Multi-function diamond film fiber optic probe and measuring system employing same

    DOEpatents

    Young, J.P.

    1998-11-24

    A fused fiber optic probe having a protective cover, a fiber optic probe system, and embodiments thereof for conducting electromagnetic spectral measurements are disclosed. The fused fiber optic probe comprises a probe tip having a specific geometrical configuration, an exciting optical fiber and at least one collection optical fiber fused within a housing, preferably silica, with a protective cover disposed over at least a portion of the probe tip. The specific geometrical configurations in which the probe tip can be shaped include a slanted probe tip with an angle greater than 0{degree}, an inverted cone-shaped probe tip, and a lens head. 9 figs.

  6. Integrated optical XY coupler

    DOEpatents

    Vawter, G.A.; Hadley, G.R.

    1997-05-06

    An integrated optical XY coupler having two converging input waveguide arms meeting in a central section and a central output waveguide arm and two diverging flanking output waveguide arms emanating from the central section. In-phase light from the input arms constructively interferes in the central section to produce a single mode output in the central output arm with the rest of the light being collected in the flanking output arms. Crosstalk between devices on a substrate is minimized by this collection of the out-of-phase light by the flanking output arms of the XY coupler. 9 figs.

  7. Drum pressure the key to managing boiler stored energy

    SciTech Connect

    Leimbach, R.A.

    2007-06-15

    As steam plant designers cherry-pick the best parts of the venerable Direct Energy Balance control system developed by the now-defunct Leeds and Northrup they are confirming that relying on throttle pressure alone is inadequate for stable boiler and turbine control. Metso Automation, the successor to Leeds & Northrup's system division, has the sole rights to the original D-E-B solution and has introduced enhancements that will further improve its ability to control large coal-fired generating units. The D-E-B system is used on more than 900 large coal-fired units around the world, including 110 in China and 60 in India. 9 figs.

  8. Eddy-current inspection of shuttle heat exchanger tube welds

    SciTech Connect

    Dodd, C.V.; Scott, G.W.; Chitwood, L.D.

    1989-01-01

    This goal of this project was to develop the system necessary to demonstrate in the laboratory that an eddy-current system can inspect the tubes and welds described above, screening for the existence of flaws equal in size to, or larger than, the target flaw. The laboratory system was to include the probe necessary to traverse the tubing, the electronics to drive (i.e., electrically excite) the probe and receive and process signals from it, a data display, data recording and playback devices, and microprocessor software or firmware necessary to operate the system. 5 refs., 9 figs., 2 tabs.

  9. 2 x 2 TeV mu(superscript +) mu (superscript) collider

    SciTech Connect

    Mokhov, N.V.; Noble, R.J.

    1996-10-01

    The scenarios for high-luminosity 2 x 2 TeV and 250 x 250 GeV {mu}{sup +}{mu}{sup -} colliders are presented. Having a high physics potential, such a machine has specific physics and technical advantages and disadvantages when compared with an e{sup +}e{sup -} collider. Parameters for the candidate designs and the basic components - proton source, pion production and decay channel, cooling, acceleration and collider storage ring - are considered. Attention is paid to the areas mostly affecting the collider performance: targetry, energy spread, superconducting magnet survival, detector backgrounds, polarization, environmental issues. 13 refs., 9 figs., 4 tabs.

  10. Hydrocarbon synthesis catalyst and method of preparation

    DOEpatents

    Sapienza, R.S.; Sansone, M.J.; Slegeir, W.A.R.

    1983-08-02

    A catalyst for the synthesis of hydrocarbons from carbon monoxide and hydrogen composed of palladium or platinum and cobalt supported on a solid phase is disclosed. The catalyst is prepared by heating a heterogeneous component of the palladium or platinum deposited on the solid support in a solution of cobalt carbonyl or precursors thereof. The catalyst exhibits excellent activity, stability in air, and produces highly desirable product fractions even with dilute gaseous reactants. The catalyst is preferably used in dilute slurry form, which is desirable from a heat transfer standpoint. 9 figs.

  11. Optical amplifier operating at 1.3 microns useful for telecommunications and based on dysprosium-doped metal chloride host materials

    DOEpatents

    Page, R.H.; Schaffers, K.I.; Payne, S.A.; Krupke, W.F.; Beach, R.J.

    1997-12-02

    Dysprosium-doped metal chloride materials offer laser properties advantageous for use as optical amplifiers in the 1.3 {micro}m telecommunications fiber optic network. The upper laser level is characterized by a millisecond lifetime, the host material possesses a moderately low refractive index, and the gain peak occurs near 1.31 {micro}m. Related halide materials, including bromides and iodides, are also useful. The Dy{sup 3+}-doped metal chlorides can be pumped with laser diodes and yield 1.3 {micro}m signal gain levels significantly beyond those currently available. 9 figs.

  12. Application of a Fourier transform IR system for measurements of N{sub 2}O fluxes using micrometeorological methods, an ultralarge chamber system, and conventional field chambers

    SciTech Connect

    Galle, B.; Klemedtsson, L.; Griffith, D.W.T.

    1994-08-20

    Measurement of the emissions of nitrous oxide from agricultural rangelands and methane from forest soils is important in explaining and predicting the relationship of these gases to global warming. The nitrous oxide flux from agricultural grasslands and the methane flux from forest soils was measured using micrometeorological techniques at a lowland site in Scotland. Emission levels were measured using Fourier transform infrared spectroscopy (FTIR) and the results showed great spatial and temporal variability. Three configurations of FTIR were used to obtain the experimental results discussed in this report. 32 refs., 9 figs.

  13. Lag-stabilized force feedback damping

    SciTech Connect

    Petterson, B.J.; Robinett, R.D.; Werner, J.C.

    1991-05-01

    A lag-stabilized, force feedback controller for damping initial and residual oscillations of a planar, cantilevered flexible arm has been analytically developed and experimentally implemented on a commercial robot. The controller feeds back force sensor measurements that are delayed in time and proportional to the displacement (angular orientation) of the arm in order to damp the oscillation. As a result of the lag (contrary to popular belief), the controlled robot system is stable and provides tunable performance on a Cincinnati Milacron T3-786 robot. 3 refs., 9 figs., 2 tabs.

  14. Order and disorder in fluid motion.

    PubMed Central

    Gollub, J P

    1995-01-01

    The development of complex states of fluid motion is illustrated by reviewing a series of experiments, emphasizing film flows, surface waves, and thermal convection. In one dimension, cellular patterns bifurcate to states of spatiotemporal chaos. In two dimensions, even ordered patterns can be surprisingly intricate when quasiperiodic patterns are included. Spatiotemporal chaos is best characterized statistically, and methods for doing so are evolving. Transport and mixing phenomena can also lead to spatial complexity, but the degree depends on the significance of molecular or thermal diffusion. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 PMID:11607563

  15. Relativistic klystron research for linear colliders

    SciTech Connect

    Allen, M.A.; Callin, R.S.; Deruyter, H.; Eppley, K.R.; Fant, K.S.; Fowkes, W.R.; Herrmannsfeldt, W.B.; Higo, T.; Hoag, H.A.; Koontz, R.F.

    1988-09-01

    Relativistic klystrons are being developed as a power source for high gradient accelerator applications which include large linear electron-positron colliders, compact accelerators, and FEL sources. We have attained 200 MW peak power at 11.4 GHz from a relativistic klystron, and 140 MV/m longitudinal gradient in a short 11.4 GHz accelerator section. We report here on the design of our relativistic klystrons, the results of our experiments so far, and some of our plans for the near future. 5 refs., 9 figs., 1 tab.

  16. An approach to elemental task learning

    SciTech Connect

    Belmans, P

    1990-01-01

    In this article we deal with the automated learning of tasks by a robotic system through observation of a human operator. Particularly, we explain what is meant by a learning ability in autonomous robots and in teleoperation systems, where several operators and several machines may work in cooperation to perform tasks. We discuss different approaches to learning in these systems and outline the features of the models they are based upon. This leads us to choose an analytical model suited for tasks analysis. We then present the software architecture for our proposed approach and show the first results obtained on sample tests. 5 refs., 9 figs.

  17. Development and construction of the SLD Cerenkov Ring Imaging Detector

    SciTech Connect

    Aston, D.; Bean, A.; Bienz, T.; Bird, F.; Caldwell, D.; Cavalli-Sforza, M.; Coyle, P.; Coyne, D.; Dasu, S.; Dunwoodie, W.

    1989-06-01

    We report on the development and construction of the Cerenkov Ring Imaging Detector (CRID) for the SLD experiment at the SLAC linear collider. In particular, we outline recent progress in the construction, and results from testing the first components of the barrel CRID, including the drift boxes, liquid radiator trays and mirror system. We also review progress in the construction of the barrel CRID gas radiator vessel, the liquid radiator recirculator system, and the electronic readout system. The development of a comprehensive monitor and control system -- upon which the stable operation and physics efficacy of the CRID depend -- is also described. 19 refs., 9 figs.

  18. Some design considerations for the proposed Dixie Valley tracer test

    SciTech Connect

    Doughty, C.; Bodvarsson, G.S.

    1988-06-01

    A tracer test for the Dixie Valley, Nevada, geothermal resource is planned for the summer of 1988, in order to study the fluid flow paths that will develop under typical operating conditions. During the test six production wells will provide the power plant with steam sufficient for generation of 60 MWe, requiring fluid production at a rate of approximately 600 kg/sec. Up to 75% by mass of the extracted fluid will be reinjected into the reservoir, using four injection wells. Tracer will be added to the injected fluid for a twenty-minute period, and subsequently the produced fluid will be monitored for the tracer. 5 refs., 9 figs., 5 tabs.

  19. Wire chamber requirements and tracking simulation studies for tracking systems at the superconducting super collider

    SciTech Connect

    Hanson, G.G.; Niczyporuk, B.B.; Palounek, A.P.T.

    1989-02-01

    Limitations placed on wire chambers by radiation damage and rate requirements in the SSC environment are reviewed. Possible conceptual designs for wire chamber tracking systems which meet these requirements are discussed. Computer simulation studies of tracking in such systems are presented. Simulations of events from interesting physics at the SSC, including hits from minimum bias background events, are examined. Results of some preliminary pattern recognition studies are given. Such computer simulation studies are necessary to determine the feasibility of wire chamber tracking systems for complex events in a high-rate environment such as the SSC. 11 refs., 9 figs., 1 tab.

  20. Calorimeter and related calculations for the Superconducting Super Collider

    SciTech Connect

    Gabriel, T.A.

    1989-02-01

    There are four topics to be covered in this paper. The first topic deals with the programs, the models, and the cross sections in the CALOR code package. Secondly, a discussion on compensating calorimetry as it applies to Fe/Si and U/Si calorimetry will be given. Thirdly, calculated results obtained on U/Si calorimeters using the CALOR system will be presented and discussed. Finally, the calculations that the Oak Ridge National Laboratory are carrying out dealing with radiation damage at the proposed Superconducting Super Collider (SSC) are described. 23 refs., 9 figs.

  1. Transport simulations of a density limit in radiation-dominated tokamak discharges: Profile effects

    SciTech Connect

    Stotler, D.P.

    1988-06-01

    The density limit observed in tokamak experiments is thought to be due to a radiative collapse of the current channel. A transport code coupled with an MHD equilibrium routine is used to determine the detailed, self-consistent evolution of the plasma profiles in tokamak discharges with radiated power close to or equalling the input power. The present work is confined to ohmic discharges in steady state. It is found that the shape of the density profile can have a significant impact on the variation of the maximum electron density with plasma current. Analytic calculations confirm this result. 41 refs., 9 figs.

  2. Superconducting magnet system for the WENDELSTEIN 7-X Stellarator

    SciTech Connect

    Sapper, Joerg

    1996-12-31

    The WENDELSTEIN 7-X Stellator is a further experiment in the small group of next-step fusion devices in the world. An essential goal of this machine is to demonstrate concept improvement towards the development of fusion devices. The magnet system is designed for optimum stellator plasma performance and the technical layout will allow steady-state plasma operation. The whole magnet is encapsulated by an inner and outer toroidal cryostat tube for cold operation. The schedule for the experimental device aims at a start of technical operation in 2002 and plasma operation two years later. 4 refs., 9 figs.

  3. Combustor oscillation attenuation via the control of fuel-supply line dynamics

    DOEpatents

    Richards, G.A.; Gemmen, R.S.

    1998-09-22

    Combustion oscillation control in combustion systems using hydrocarbon fuels is provided by acoustically tuning a fuel-delivery line to a desired phase of the combustion oscillations for providing a pulse of a fuel-rich region at the oscillating flame front at each time when the oscillation produced pressure in the combustion chamber is in a low pressure phase. The additional heat release produced by burning such fuel-rich regions during low combustion chamber pressure effectively attenuates the combustion oscillations to a selected value. 9 figs.

  4. Self assembled molecular monolayers on high surface area materials as molecular getters

    DOEpatents

    King, D.E.; Herdt, G.C.; Czanderna, A.W.

    1997-01-07

    The present invention relates to a gettering material that may be used as a filtration medium to remove pollutants from the environment. The gettering material comprises a high surface area material having a metal surface that chemically bonds n-alkanethiols in an organized manner thereby forming a molecular monolayer over the metal surface. The n-alkanethiols have a free functional group that interacts with the environment thereby binding specific pollutants that may be present. The gettering material may be exposed to streams of air in heating, ventilation, and air conditioning systems or streams of water to remove specific pollutants from either medium. 9 figs.

  5. Liquid low level waste management expert system

    SciTech Connect

    Ferrada, J.J.; Abraham, T.J. ); Jackson, J.R. )

    1991-01-01

    An expert system has been developed as part of a new initiative for the Oak Ridge National Laboratory (ORNL) systems analysis program. This expert system will aid in prioritizing radioactive waste streams for treatment and disposal by evaluating the severity and treatability of the problem, as well as the final waste form. The objectives of the expert system development included: (1) collecting information on process treatment technologies for liquid low-level waste (LLLW) that can be incorporated in the knowledge base of the expert system, and (2) producing a prototype that suggests processes and disposal technologies for the ORNL LLLW system. 4 refs., 9 figs.

  6. An overview of the planned advanced neutron source facility

    SciTech Connect

    West, C.D.

    1990-01-01

    The Advanced Neutron Source (ANS), now in the conceptual design stage, will be a new user facility for neutron research, including neutron beam experiments, materials irradiation testing and materials analysis capabilities, and production facilities for transuranic and lighter isotopes. The neutron source is to be the world's highest flux beam reactor and is based on existing reactor technology to minimize safety issues. The preferred fuel, U{sub 3}Si{sub 2}, has been tested in operating reactors in the United States, Japan, and Europe. The core is cooled, moderated, and reflected by heavy water, common practice for research reactors. 3 refs., 9 figs., 3 tabs.

  7. Prediction of Nino 3 sea surface temperatures using linear inverse modeling

    SciTech Connect

    Penland, C.; Magorian, T. )

    1993-06-01

    Linear inverse modeling is used to predict sea surface temperatures (SSTs) in the Nino 3 region. Predictors in three geographical locations are used: the tropical Pacific Ocean, the tropical Pacific and Indian oceans, and the global tropical oceans. Predictions did not depend crucially on any of these three domains, and evidence was found to support the assumption that linear dynamics dominates most of the record. The prediction model performs better when SST anomalies are rapidly evolving than during warm events when large anomalies persist. The rms prediction error at a lead time of 9 months is about half a degree Celsius. 31 refs., 9 figs., 1 tab.

  8. Parameters influencing zeolite incorporation in PDMS membranes

    SciTech Connect

    Vankelecom, I.F.J.; Scheppers, E.; Heus, R.; Uytterhoeven, J.B. )

    1994-11-24

    The incorporation of several types of zeolite in PDMS membranes is studied, by measuring the tensile strength, xylene sorption, and density of the membranes. The zeolite is shown to be involved in the cross-linking of the membrane. The interaction between the PDMS matrix and the zeolites results in reinforced membranes in the case of zeolite Y. The parameters influencing the dispersion of the zeolite in the membrane are investigated, as well as several aspects of the preparation method. Finally, the idea of cross-linking is applied to explain the results of water/ethanol pervaporation. 25 refs., 9 figs., 4 tabs.

  9. Very high pressure Moessbauer spectroscopy using diamond anvil cells

    SciTech Connect

    Pasternak, M.P.; Taylor, R.D.

    1988-01-01

    The technique of generating very high pressure by means of Diamond Anvil Cells (DAC) for Mossbauer Effect applications is outlined. A comprehensive description is presented of the principles of DAC, modification for the use in M/umlt o/ssbauer Spectroscopy (MS), the Merrill--Bassett and Bassett cells, of pressure measurements, of gasketing and collimation, and of hydrostatic media. Examples of /sup 151/Eu, /sup 119/Sn and /sup 129/I are given showing the feasibility of DAC applications in MS. Other isotopes with potential use for high pressure MS using DAC are suggested. 27 refs., 9 figs.

  10. A comparative study of short range order in Fe-Cr and Fe-V alloys around equiatomic composition

    SciTech Connect

    Turchi, P.E.A.; Sluiter, M. ); Stocks, G.M. )

    1990-12-04

    Configurational energies have been calculated for equiatomic Fe-Cr and Fe-V alloys possessing the high temperature bcc crystalline structure, within a first principles electronic band structure approach. In agreement with experimental facts, a tendency towards order, with a B2 ordered structure of CsCl type, is found for FeV whereas phase separation characterized FeCr. These results suggest that the nature of short range order in the high temperature bcc solid solution is not the primary driving force for describing the structural transformation from bcc to sigma which takes place in both alloys upon decreasing temperature. 15 refs., 9 figs., 1 tab.

  11. Fractional channel multichannel analyzer

    DOEpatents

    Brackenbush, L.W.; Anderson, G.A.

    1994-08-23

    A multichannel analyzer incorporating the features of the present invention obtains the effect of fractional channels thus greatly reducing the number of actual channels necessary to record complex line spectra. This is accomplished by using an analog-to-digital converter in the asynchronous mode, i.e., the gate pulse from the pulse height-to-pulse width converter is not synchronized with the signal from a clock oscillator. This saves power and reduces the number of components required on the board to achieve the effect of radically expanding the number of channels without changing the circuit board. 9 figs.

  12. Colloidal-gold electrosensor measuring device

    DOEpatents

    Wegner, S.; Harpold, M.A.; McCaffrey, T.M.; Morris, S.E.; Wojciechowski, M.; Zhao, J.; Henkens, R.W.; Naser, N.; O`Daly, J.P.

    1995-11-21

    The present invention provides a new device for use in measuring lead levels in biological and environmental samples. Using square wave coulometry and colloidal gold particles impregnated on carbon electrodes, the present invention provides a rapid, reliable, portable and inexpensive means of detecting low lead levels. The colloidal gold modified electrodes have microelectrode array characteristics and produce significantly higher stripping detection signals for lead than are produced at bulk gold electrode surfaces. The method is effective in determining levels of lead down to at least 5 {micro}g/dL in blood samples as small as 10 {micro}L. 9 figs.

  13. Utilization of agricultural wastes for production of ethanol. Report No. 1, saccharification of cotton seed hulls. Annual progress report, 1979-1980

    SciTech Connect

    Singh, P.B.; Akinsanya, A.A.

    1980-01-01

    The objective of this investigation was to convert the cellulosic material in cottonseed hulls (CS) to fermentable sugars by: (1) treating the hulls with (a) acid using 1N HCl and 1N HCl and 1N H/sub 2/SO/sub 4/, (b) alkali using 1N NaOH and 1N NH/sub 4/OH, (c) Cadoxen - a colorless and odorless solvent made by dissolving 5% Cadmium oxide in 28% aqueous ethylene diamine; and (d) pressure cooking; and (2) enzymatic hydrolysis of the pretreated and untreated CS by Cellulase Tv Concentrate. 9 refs., 9 figs., 14 tabs.

  14. Apparatus and method for quantitative assay of samples of transuranic waste contained in barrels in the presence of matrix material

    DOEpatents

    Caldwell, J.T.; Herrera, G.C.; Hastings, R.D.; Shunk, E.R.; Kunz, W.E.

    1987-08-28

    Apparatus and method for performing corrections for matrix material effects on the neutron measurements generated from analysis of transuranic waste drums using the differential-dieaway technique. By measuring the absorption index and the moderator index for a particular drum, correction factors can be determined for the effects of matrix materials on the ''observed'' quantity of fissile and fertile material present therein in order to determine the actual assays thereof. A barrel flux monitor is introduced into the measurement chamber to accomplish these measurements as a new contribution to the differential-dieaway technology. 9 figs.

  15. Gas Metal Arc Weld (GMAW) Qualification of 7020-T651 Aluminum

    DTIC Science & Technology

    2015-11-01

    beam, and push-pull wire feed........................................................9 Fig. 6 Drawing of v-groove joint and end tabs used for ballistic...procedure 806-1, 5087 wire , GMAW-P, page 3 ........................52 vii Fig. C-1 Drawing of the 25.04-mm-thick qualification panels (QPs...plate made with the condition of 5556A wire , GMAW-P mode, and 25.04-mm plate thickness. Fig. 4 Drawing and tension specimens for welds of 39.94-mm

  16. Method for isotopic analysis of chlorinated organic compounds

    DOEpatents

    Holt, B.D.; Sturchio, N.C.

    1999-08-24

    The present invention provides a method for preparing a VOC sample for carbon and chlorine isotope ratio analysis by mass spectrometer. A VOC sample is placed in a combustion tube and reacted with CuO to form CO{sub 2} and CuCl. The CO{sub 2} is then extracted and analyzed for the carbon isotope ratio. The CuCl is separated from the excess CuO and reacted with CH{sub 3}I to form CH{sub 3}Cl, extracted and analyzed for chlorine isotope ratio. 9 figs.

  17. Microcharacterization of coal components for beneficiation

    SciTech Connect

    Straszheim, W.E.; Markuszewski, R.

    1989-06-01

    SEM-based automated image analysis (AIA) was used to characterize the degree of association of mineral particles with the organic coal matrix for two western coals before and after float-sink separation. Samples of the Williams Fork Q bed and the Hanna No. 80 coals were ground to {minus}200 mesh and separated by float-sink at 1.6 specific gravity. The analyses were performed on feed, float, and sink samples. Results for the Williams Fork samples were reported last quarter, and results for the Hanna samples are presented in this report. 4 refs., 9 figs., 4 tabs.

  18. Preliminary assessment of the impact of incorporating a detailed algorithm for the effects of nuclear irradiation on combat crew performance into the Janus combat simulation

    SciTech Connect

    Warshawsky, A.S.; Uzelac, M.J.; Pimper, J.E. )

    1989-05-01

    The Crew III algorithm for assessing time and dose dependent combat crew performance subsequent to nuclear irradiation was incorporated into the Janus combat simulation system. Battle outcomes using this algorithm were compared to outcomes based on the currently used time-independent cookie-cutter'' assessment methodology. The results illustrate quantifiable differences in battle outcome between the two assessment techniques. Results suggest that tactical nuclear weapons are more effective than currently assumed if performance degradation attributed to radiation doses between 150 to 3000 rad are taken into account. 6 refs., 9 figs.

  19. Integrated main rail, feed rail, and current collector

    DOEpatents

    Petri, R.J.; Meek, J.; Bachta, R.P.; Marianowski, L.G.

    1994-11-08

    A separator plate is described for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced. 9 figs.

  20. Economic geology of the Copper Mountain Supracrustal Belt, Owl Creek Mountains, Fremont County, Wyoming

    SciTech Connect

    Hausel, W.D.; Graff, P.J.; Albert, K.G.

    1985-01-01

    The Archean stratigraphy and associated mineral deposits at Copper Mountain were investigated to determine if this supracrustal belt has potential commercial mineral deposits. It was concluded Copper Mountain lacks the stratigraphic and structural character of a classical greenstone belt, exhibits higher metamorphic grade, and may be better classified as a high-grade terrain. However, potential is noted for stratiform Au associated with iron formation, stratiform W associated with gneiss, and Cu-Au mineralization in strike veins. 63 refs., 9 figs., 3 tabs. (ACR)

  1. The human growth hormone gene is regulated by a multicomponent locus control region

    SciTech Connect

    Jones, B.; Cooke, N.E.; Liebhaber, S.A.; Monks, B.R.

    1995-12-01

    This article describes research involving the five-member human growth hormone (hGH)/chorionic somatomammotropin (hCS) gene cluster and its expression in the placenta. The results indicate that interactions among multiple elements are required to restrict hGH transcription to the pituitary and generate appropriate levels of expression in the mouse genome. In addition, the results suggest a role for shared and unique regulatory sequences in locus control region-mediated expression of the hGH/hCS gene cluster in the pituitary and possibly the placenta. 67 refs., 9 figs.

  2. Electromagnetic pump stator coil

    DOEpatents

    Fanning, A.W.; Dahl, L.R.

    1996-06-25

    An electrical stator coil for an electromagnetic pump includes a continuous conductor strip having first and second terminals at opposite ends thereof and an intermediate section disposed therebetween. The strip is configured in first and second coil halves, with the first coil half including a plurality of windings extending from the first terminal to the intermediate section, and the second coil half including a plurality of windings extending from the second terminal to the intermediate section. The first and second coil halves are disposed coaxially, and the first and second terminals are disposed radially inwardly therefrom with the intermediate section being disposed radially outwardly therefrom. 9 figs.

  3. Exploratory shaft facility: It`s role in the characterization of the Yucca Mountain site for a potential nuclear repository

    SciTech Connect

    Kalia, H.N.; Merson, T.J.

    1990-03-01

    The US Department of Energy is characterizing Yucca Mountain, Nevada, to assess its suitability as a potential site for the permanent disposal of high-level radioactive waste from nuclear power plants and defense related activities. The assessment activities include surface investigations, drill holes from the surface, and an underground facility for in situ characterization tests. This underground exploratory shaft facility is being designed to meet the criteria for characterizing the mountain as described in the Site Characterization Plan. 9 refs., 9 figs., 1 tab.

  4. Annual Outlook for US Electric Power, 1985

    SciTech Connect

    Not Available

    1985-08-12

    This report provides a history and projections of US electric utility markets. It includes summary information on the production of electricity, its distribution to end-use sectors, and on electricity, its distribution to end-use sectors, and on electricity costs and prices. Further, this publication describes the ownership structure of the industry and the operations of utility systems and outlines basic electricity generating technologies. The historical information covers the period from 1882 through 1984, while projections extend from 1985 through 1995. 9 figs., 8 tabs.

  5. PANDA asymmetric-configuration passive decay heat removal test results

    SciTech Connect

    Fischer, O.; Dreier, J.; Aubert, C.

    1997-12-01

    PANDA is a large-scale, low-pressure test facility for investigating passive decay heat removal systems for the next generation of LWRs. In the first series of experiments, PANDA was used to examine the long-term LOCA response of the Passive Containment Cooling System (PCCS) for the General Electric (GE) Simplified Boiling Water Reactor (SBWR). The test objectives include concept demonstration and extension of the database available for qualification of containment codes. Also included is the study of the effects of nonuniform distributions of steam and noncondensable gases in the Dry-well (DW) and in the Suppression Chamber (SC). 3 refs., 9 figs.

  6. Synthesis of chiral diether and tetraether phospholipids: Regiospecific ring opening of epoxy alcohol intermediates derived from asymmetric epoxidation

    SciTech Connect

    Thompson, D.H.; Svendsen, C.B.; Di Meglio, C.; Anderson, V.C.

    1994-06-03

    Diether and tetraether phospholipids have been synthesized using chiral epoxy alcohol starting materials (e.g. glycidol 3-nitrobenzenesulfonate esters or tert-butyldiphenylsilyl ethers). These chiral precursors provide control over the stereochemistry, substitution patterns, and steric properties of the phosphoglycerol backbone. Configuration at the sn-2 glycerol carbon was controlled by asymmetric epoxidation of allyl alcohol followed by acid-catalyzed, regioselective opening of the oxirane ring using excess aliphatic n-alcohols to give mono-O-alkylated glycerol intermediates in good yields. 9 figs., 5 tabs.

  7. Present concept on current water protection and remediation activities for the areas contaminated by the 1986 Chernobyl accident

    SciTech Connect

    Voitsekhovitch, O.; Prister, B.; Nasvit, O.; Los, I.; Berkovski, V.

    1996-07-01

    The results of radiation monitoring data and migration pathway analysis of water bodies within areas affected by the 1986 Chernobyl accident provide a unique opportunity for decision-makers working in other extensively contaminated regions to optimize their approaches to surface and groundwater protection. Most engineering measures within the Chernobyl 30-km exclusion zone were focused on preventing secondary contamination of surface and groundwater from entering the Pripyat River and the Kiev Reservoir. However, implementation of these measures required huge financial and human resources. Therefore, lessons about post-accidental water protection activities can be learned form the Chernobyl example. 9 refs., 9 figs.

  8. A new apparatus for the study of nuclear Bragg scattering

    SciTech Connect

    Siddons, D.P.; Hastings, J.B.; Faigel, G.

    1987-01-01

    A new monochromator system has been constructed which provides an energy resolution of 0.005 eV and an angular divergence of 0.4 arc seconds at an energy of 14.413 keV. In conjunction with a highly perfect crystal of isotopically enriched /sup 57/Fe/sub 2/O/sub 3/, a beam of nuclear resonant photons was extracted from the synchrotron continuum with signal to noise ratio of 100:1, and an intensity of >2 quanta/sec. 14 refs., 9 figs.

  9. Firearm equipped with live round inhibiting means and method of making same

    DOEpatents

    Baehr, D.G.

    1990-11-13

    A firearm is disclosed having live round inhibiting means mounted in the barrel of the firearm which permits a blank cartridge to be loaded into a firearm and fired while preventing the loading and firing of a live round. The live round inhibiting means comprise shaft means mounted in the barrel of the firearm and which extends a sufficient length into the barrel at a point just beyond the chamber portion of the firearm to engage the bullet portion of a live round to prevent it from properly chambering, while permitting a blank cartridge to be loaded into the firearm and fired without engaging the live round-inhibiting shaft means. 9 figs.

  10. Properties of a symmetric RHIC insertion

    SciTech Connect

    Lee, S.Y.

    1991-07-01

    This report evaluates the lattice functions of the symmetric insertion proposed by A.G. Ruggiero for the RHIC insertion. The crossing geometry, Inner and Outer matching sections, and chromatic properties are studied in detail. Some properties of the missing dipole dispersion correction scheme are also discussed. We found that the chromatic properties of the symmetric insertion is not better than the antisymmetric insertion. The problem is that the four family sextupole correction scheme seems not able to improve the chromatic distortion. Analytic understanding of the failure of the four family sextupole correction scheme will be very useful. 9 figs., 1 tab.

  11. Firearm equipped with live round inhibiting means and method of making same

    SciTech Connect

    Baehr, D.G.

    1989-10-12

    A firearm is disclosed having live round inhibiting means mounted in the barrel of the firearm which permits a blank cartridge to be loaded into a firearm and fired while preventing the loading and firing of a live round. The live round inhibiting means comprise shaft means mounted in the barrel of the firearm and which extends a sufficient length into the barrel at a point just beyond the chamber portion of the firearm to engage the bullet portion of a live round to prevent it from properly chambering, while permitting a blank cartridge to be loaded into the firearm and fired without engaging the live round-inhibiting shaft means. 9 figs.

  12. Design of an omnidirectional and holonomic wheeled platform prototype

    SciTech Connect

    Killough, S.M.; Pin, F.G.

    1991-01-01

    This paper presents the concepts for a new family of wheeled platforms which feature full omnidirectionality with simultaneous and independent rotational and translational motion capabilities. We first describe the original orthogonal-wheels assembly'' on which these platforms are based and discuss how a combination of these assemblies is used to generate an omnidirectional capability. The design and control of a prototype platform developed to test and demonstrate the proposed concepts is then described, and experimental results illustrating the full omnidirectionality of the platform with decoupled rotational and translational degrees of freedom are presented. 15 refs., 9 figs.

  13. Optical heat flux gauge

    SciTech Connect

    Noel, B.W.; Borella, H.M.; Cates, M.R.; Turley, W.D.; MacArthur, C.D.; Cala, G.C.

    1989-06-07

    A heat flux gauge comprising first and second thermographic phosphor layers separated by a layer of a thermal insulator. The gauge may be mounted on a surface with the first thermographic phosphor in contact with the surface. A light source is directed at the gauge, causing the phosphors to luminesce. The luminescence produced by the phosphors is collected and its spectra analyzed in order to determine the heat flux on the surface. First and second phosphor layers must be different materials to assure that the spectral lines collected will be distinguishable. 9 figs.

  14. Performance assessment for low-level radioactive waste disposal

    SciTech Connect

    Cook, J.R.; Hsu, R.H.; Wilhite, E.L.; Yu, A.D.

    1996-09-01

    In October 1994 the Savannah River Site became the first US DOE complex to use concrete vaults to dispose of low-level radioactive solid waste and better prevent soil and groundwater contamination. This article describes the design and gives a performance assessment of the vaults. Topics include the following: Performance objectives; scope; the performance assessment process-assemble a multidisciplinary working group; collect available data; define credible pathways/scenarios; develop conceptual models; conduct screening and detailed model calculations; assess sensitivity/uncertainty; integrate and interpret results; report. 9 figs., 3 tabs.

  15. Potential of alternative sorbents for desulphurization: from laboratory tests to the full-scale combustion unit

    SciTech Connect

    Zbyszek Szeliga; Dagmar Juchelkova; Bohumir Cech; Pavel Kolat; Franz Winter; Adam J. Campen; Tomasz S. Wiltowski

    2008-09-15

    At present, natural limestone is used for the desulphurization of waste gases from the combustion of fossil fuels. However, it is important to save all primary resources, such as limestone, for the future. The researchers focused on finding alternative sorbents for the purpose of desulphurization in a dry additive method, which would become the alternative for natural limestone. This paper is primarily focused on desulphurization tests of selected substances. Tests were initially conducted on the laboratory scale, followed by pilot and full-scale combustion units. 15 refs., 9 figs., 5 tabs.

  16. Collective flow measured with the Plastic Ball

    SciTech Connect

    Ritter, H.G.; Gutbrod, H.H.; Kampert, K.H.; Kolb, B.; Poskanzer, A.M.; Schicker, R.; Schmidt, H.R.; Siemiarczuk, T.

    1989-08-01

    The experimental results from the Plastic Ball detector have contributed vastly to the understanding of the reaction mechanism of nuclear collisions at several hundred MeV per nucleon. The discovery of the collective flow phenomena (bounce-off of spectator fragments, side-splash in the reaction plane, and squeeze-out out of the reaction plane), as they were predicted by hydrodynamical models, has led to the experimental observation of compressed nuclear matter, which is a necessary condition before one can study the equation of state in detail and search for phase transitions at higher energies. 39 refs., 9 figs., 1 tab.

  17. Beryllium weldability

    SciTech Connect

    Hill, M.A.; Damkroger, B.K.; Dixon, R.D. ); Robertson, E. )

    1990-01-01

    Welding processes and metallurgical considerations for beryllium welding are discussed in this review. The primary difficulties of welding beryllium are hot cracking, cracking at defects, and ductility limitation or thermally induced cracking. Solutions to these welding problems include control of the Fe/Al ratio in the base metal to reduce hot cracking, minimization of the BeO content and starting grain size to limit cracking at defects and ductility limitation cracking, and optimization of the welding process and process variables. 25 refs., 9 figs., 2 tabs.

  18. Process for preparing silicon carbide foam

    DOEpatents

    Whinnery, L.L.; Nichols, M.C.; Wheeler, D.R.; Loy, D.A.

    1997-09-16

    A method of preparing near net shape, monolithic, porous SiC foams is disclosed. Organosilicon precursors are used to produce polymeric gels by thermally induced phase separation, wherein, a sufficiently concentrated solution of an organosilicon polymer is cooled below its solidification temperature to form a gel. Following solvent removal from the gel, the polymer foam is pretreated in an oxygen plasma in order to raise its glass transition temperature. The pretreated foam is then pyrolyzed in an inert atmosphere to form a SiC foam. 9 figs.

  19. Finger wear detection for production line battery tester

    DOEpatents

    Depiante, E.V.

    1997-11-18

    A method is described for detecting wear in a battery tester probe. The method includes providing a battery tester unit having at least one tester finger, generating a tester signal using the tester fingers and battery tester unit with the signal characteristic of the electrochemical condition of the battery and the tester finger, applying wavelet transformation to the tester signal including computing a mother wavelet to produce finger wear indicator signals, analyzing the signals to create a finger wear index, comparing the wear index for the tester finger with the index for a new tester finger and generating a tester finger signal change signal to indicate achieving a threshold wear change. 9 figs.

  20. Initial hydrogenation and extensive reduction of substituted 2,4-dinitrophenols

    SciTech Connect

    Lenke, H.; Knackmuss, Hans-Joachim

    1996-03-01

    Nitrophenolic compounds are widely used in industry as intermediates in the production of pesticides, dyes and explosives, becoming common contaminants. Oxidative as well as reductive reactions are known to initiate degradation of nitrophenolic compounds. Recently an alternative pathway for the degradation of 4-nitrophenol by a Arthrobacter sp. has been described. The present paper describes the reductive metabolism of ortho-substituted 2,4-dinitrophenol as structural analogs of picric acid and gives further support to its hydrogenation as the critical initial reaction. 35 refs., 9 figs., 4 tabs.

  1. Fatigue life and performance testing of hybrid ceramic ball bearings

    SciTech Connect

    Chiu, Y.P.; Prason, P.K.; Dezzani, M.

    1996-03-01

    Hybrid ceramic ball bearings are finding increased applications in machine tool spindles and aerospace vehicles. Results of three types of testing hybrid ceramic ball bearing are presented and discussed. The first is the classical endurance testing of highly loaded hybrid bearings with good lubrication. The second is the endurance test of hybrid nitrided bearings after running in a contaminated lubricant which caused dented raceways. The third is the high-speed performance testing of spindle bearings lubricated with grease or an oil-air mixture. Recent material development, bearing temperature at high-speed and reliability considerations are discussed. 14 refs., 9 fig., 4 tab.

  2. Bile salt surfactants in micellar electrokinetic capillary chromatography: Application to hydrophobic molecule separations

    SciTech Connect

    Cole, R.O.; Sepaniak, M.J. . Dept. of Chemistry); Hinze, W.L. . Dept. of Chemistry); Gorse, J.; Oldiges, K. . Dept. of Chemistry)

    1990-01-01

    Bile Salt surfactants are used in the micellar electrokinetic capillary chromatography (MECC) separation of various hydrophobic compounds. The use of methanol in the mobile phase allows the separation of previously intractable compounds including polyaromatic hydrocarbons. The effects of methanol on critical micelle concentration is investigated for sodium dodecyl sulfate (SDS) and the bile salt sodium cholate. It is determined that the unique structure of the bile salt micelle is much more tolerant to the addition of organic solvents than SDS, thereby increasing the scope of applications of MECC to include hydrophobic compounds. 30 refs., 9 figs.

  3. Binary and ternary gas mixtures for use in glow discharge closing switches

    DOEpatents

    Hunter, S.R.; Christophorou, L.G.

    1988-04-27

    Highly efficient binary and ternary gas mixtures for use in diffuse glow discharge closing switches are disclosed. The binary mixtures are combinations of helium or neon and selected perfluorides. The ternary mixtures are combinations of helium, neon, or argon, a selected perfluoride, and a small amount of gas that exhibits enhanced ionization characteristics. These mixtures are shown to be the optimum choices for use in diffuse glow discharge closing switches by virtue if the combines physio-electric properties of the mixture components. 9 figs.

  4. A microscopic analysis of in-cylinder swirl generated by directed ports

    SciTech Connect

    Liu, X.; Liu, R.; Xiao, F.; Guan, L.

    1994-09-01

    Based on 3-dimensional velocity data at intake valve exit area of typical SI engine intake ports (horizontal and sloping directed ports) measured by hot wire anemometry in a steady flow rig, the magnitudes and compositions of inflow angular momentum flux and swirl ratios at the end of induction process generated by each velocity component were computed at different intake valve lifts and distances along valve axis. A microscopic evaluation method was provided for evaluating intake port characteristics according to intake valve exit flow field. 5 refs., 9 figs.

  5. Dynamics of rock varnish formation

    SciTech Connect

    Raymond, R. Jr.; Reneau, S.L.; Guthrie, G.D. Jr.; Bish, D.L.; Harrington, C.D.

    1991-01-01

    Our studies of rock varnish from the southwestern United States suggest that the Mn-phase in rock varnish has neither the chemistry nor the crystal structure of birnessite. Rather, the Mn-rich phase is non-crystalline and contains Ba, Ca, Fe, Al, and P. Unknowns concerning the formation of this non-crystalline Mn phase must be resolved before researchers are able to define chemical parameters of rock varnish formation based upon conditions of formation of the Mn phase. 6 refs., 9 figs.

  6. A suitability study of the fission product phantom and the bottle manikin absorption phantom for calibration of in vivo bioassay equipment for the DOELAP accreditation testing program

    SciTech Connect

    Olsen, P.C.; Lynch, T.P.

    1991-08-01

    Pacific Northwest laboratory (PNL) conducted an intercomparison study of the Fission Product phantom and the bottle manikin absorption (BOMAB) phantom for the US Department of Energy (DOE) to determine the consistency of calibration response of the two phantoms and their suitability for certification and use under a planned bioassay laboratory accreditation program. The study was initiated to determine calibration factors for both types of phantoms and to evaluate the suitability of their use in DOE Laboratory Accreditation Program (DOELAP) round-robin testing. The BOMAB was found to be more appropriate for the DOELAP testing program. 9 refs., 9 figs., 9 tabs.

  7. Karst Lands: The dissolution of carbonate rock produces unique landscapes and poses significant hydrological and environmental concerns

    SciTech Connect

    White, W.B.; Culver, D.C.; Herman, J.S.

    1995-09-01

    Karst lands are produced by the action of water on soluble rocks, a process among the most dynamic of all erosive forces that counterbalance the uplifting forces of tectonics. The dissolution of carbonate rock, primarily limestone and dolomite, produces unique landscapes and poses significant hydrological and environmental concerns. The major topic areas discussed in this article include the following: processes that form karst; karst drainage basins; discharge from karst aquifers; caves as paleoclimatic recorders; caves as ecosystems; water issues in karst regions; and sinkholes, soil piping and subsidence. 20 refs., 9 figs.

  8. Radio-frequency and microwave load comprising a carbon-bonded carbon fiber composite

    DOEpatents

    Lauf, R.J.; McMillan, A.D.; Johnson, A.C.; Everleigh, C.A.; Moorhead, A.J.

    1998-04-21

    A billet of low-density carbon-bonded carbon fiber (CBCF) composite is machined into a desired attenuator or load element shape (usually tapering). The CBCF composite is used as a free-standing load element or, preferably, brazed to the copper, brass or aluminum components of coaxial transmission lines or microwave waveguides. A novel braze method was developed for the brazing step. The resulting attenuator and/or load devices are robust, relatively inexpensive, more easily fabricated, and have improved performance over conventional graded-coating loads. 9 figs.

  9. Optimized ECR plasma apparatus with varied microwave window thickness

    DOEpatents

    Berry, L.A.

    1995-11-14

    The present invention describes a technique to control the radial profile of microwave power in an ECR plasma discharge. In order to provide for a uniform plasma density to a specimen, uniform energy absorption by the plasma is desired. By controlling the radial profile of the microwave power transmitted through the microwave window of a reactor, the profile of the transmitted energy to the plasma can be controlled in order to have uniform energy absorption by the plasma. An advantage of controlling the profile using the window transmission characteristics is that variations to the radial profile of microwave power can be made without changing the microwave coupler or reactor design. 9 figs.

  10. Designing and upgrading plants to blend coal

    SciTech Connect

    McCartney, R.H.

    2006-10-15

    Fuel flexibility isn't free. Whether you are equipping a new power plant to burn more than one type of coal or retrofitting an existing plant to handle coal blends, you will have to spend time and money to ensure that all three functions performed by its coal-handling system, unloading, stockout, and reclaim, are up to the task. The first half of this article lays out the available options for configuring each subsystem to support blending. The second half describes, in words and pictures, how 12 power plants in the USA, both new and old, address the issue. 9 figs., 1 tab.

  11. An efficient computational tool for ramjet combustor research

    SciTech Connect

    Vanka, S.P.; Krazinski, J.L.; Nejad, A.S.

    1988-01-01

    A multigrid based calculation procedure is presented for the efficient solution of the time-averaged equations of a turbulent elliptic reacting flow. The equations are solved on a non-orthogonal curvilinear coordinate system. The physical models currently incorporated are a two equation k-epsilon turbulence model, a four-step chemical kinetics mechanism, and a Lagrangian particle tracking procedure applicable for dilute sprays. Demonstration calculations are presented to illustrate the performance of the calculation procedure for a ramjet dump combustor configuration. 21 refs., 9 figs., 2 tabs.

  12. Structural performance of the first SSC (Superconducting Super Collider) Design B dipole magnet

    SciTech Connect

    Nicol, T.H.

    1989-09-01

    The first Design B Superconducting Super Collider (SSC) dipole magnet has been successfully tested. This magnet was heavily instrumented with temperature and strain gage sensors in order to evaluate its adherence to design constraints and design calculations. The instrumentation and associated data acquisition system allowed monitoring of the magnet during cooldown, warmup, and quench testing. This paper will focus on the results obtained from structural measurements on the suspension system during normal and rapid cooldowns and during quench studies at full magnet current. 4 refs., 9 figs.

  13. Role of deflagration in explosive response

    SciTech Connect

    Lee, E.L.; Weston, A.M.

    1988-06-20

    Measurements on materials of varying burn rates, particularly at high pressure, show a strong correlation with the violence of the response of thes materials to a range of hazard stimuli. We have analyzed the response using somewhat idealized model for deflagrating materials. The results can be compared with various tests for hazard reponse. We have studied confinement effects and chosen a particular confinement to quantify the explosive response. The effects of porosity, ignition behavior, and laminar burn rate are clearly revealed by the results of the model. Possibilities for formulating less vulnerable materials are discussed. 9 refs., 9 figs.

  14. High temperature superconductor current leads

    DOEpatents

    Hull, J.R.; Poeppel, R.B.

    1995-06-20

    An electrical lead is disclosed having one end for connection to an apparatus in a cryogenic environment and the other end for connection to an apparatus outside the cryogenic environment. The electrical lead includes a high temperature superconductor wire and an electrically conductive material distributed therein, where the conductive material is present at the one end of the lead at a concentration in the range of from 0 to about 3% by volume, and at the other end of the lead at a concentration of less than about 20% by volume. Various embodiments are shown for groups of high temperature superconductor wires and sheaths. 9 figs.

  15. Unitary lens semiconductor device

    DOEpatents

    Lear, K.L.

    1997-05-27

    A unitary lens semiconductor device and method are disclosed. The unitary lens semiconductor device is provided with at least one semiconductor layer having a composition varying in the growth direction for unitarily forming one or more lenses in the semiconductor layer. Unitary lens semiconductor devices may be formed as light-processing devices such as microlenses, and as light-active devices such as light-emitting diodes, photodetectors, resonant-cavity light-emitting diodes, vertical-cavity surface-emitting lasers, and resonant cavity photodetectors. 9 figs.

  16. Prescriptions for growth: A status report on U. S. Department of Energy communications with colleges land universities

    SciTech Connect

    Morrison, W.D.; Rodman, J.A.

    1988-02-01

    This report presents the results of a study designed to evaluate the effectiveness of DOE communications with the nation's colleges and universities. A 1983 report of the Energy Research Advisory Board (ERAB) entitled An Assessment of the Relationship Between the Department of Energy and Universities and Colleges (the ERAB report) concluded that relationships between US Department of Energy and the academic community would be significantly enhanced by the development of effective reciprocal communication process. The ERAB report identified many communication-related issues that impact the important working relationship between DOE and acedeme. 9 figs.

  17. An approximate method for calculating aircraft downwash on parachute trajectories

    SciTech Connect

    Strickland, J.H.

    1989-01-01

    An approximate method for calculating velocities induced by aircraft on parachute trajectories is presented herein. A simple system of quadrilateral vortex panels is used to model the aircraft wing and its wake. The purpose of this work is to provide a simple analytical tool which can be used to approximate the effect of aircraft-induced velocities on parachute performance. Performance issues such as turnover and wake recontact may be strongly influenced by velocities induced by the wake of the delivering aircraft, especially if the aircraft is maneuvering at the time of parachute deployment. 7 refs., 9 figs.

  18. Mix experiments with the NOVA laser

    SciTech Connect

    Rupert, V.C.; Kilkenny, J.D.; Skokowski, P.G.

    1988-10-01

    The NOVA mix experiments are designed to study mix between two dissimilar materials subjected to strong (M/approximately/50) shocks and variable accelerations in a direction normal to their common boundary. The main purpose of the experiments is to provide a data base with which predictive models can be compared and normalized. Together with shock tube experiments, which explore a different regime, the current NOVA tests investigate the shock induced source terms in our model and the evolution of both Rayleigh-Taylor stable and unstable interfaces. 3 refs., 9 figs.

  19. The risk equivalent of an exposure to-, versus a dose of radiation

    SciTech Connect

    Bond, V.P.

    1986-01-01

    The long-term potential carcinogenic effects of low-level exposure (LLE) are addressed. The principal point discussed is linear, no-threshold dose-response curve. That the linear no-threshold, or proportional relationship is widely used is seen in the way in which the values for cancer risk coefficients are expressed - in terms of new cases, per million persons exposed, per year, per unit exposure or dose. This implies that the underlying relationship is proportional, i.e., ''linear, without threshold''. 12 refs., 9 figs., 1 tab.

  20. Non-invasive hyperthermia apparatus including coaxial applicator having a non-invasive radiometric receiving antenna incorporated therein and method of use thereof

    DOEpatents

    Ross, M.P.

    1996-08-27

    A coaxial hyperthermia applicator is disclosed for applying non-invasively electromagnetic energy to a body against which it is placed. The coaxial applicator antenna has formed integrally within it a non-invasive radiometric antenna for receiving thermoelectromagnetic emissions. The coaxial-configured applicator produces a bell-shaped radiation pattern symmetric about the axis of symmetry of the coaxial applicator. Integrating the radiometric antenna within the coaxial applicator produces a single device that performs dual functions. The first function is to transmit non-invasively energy for heating a subcutaneous tumor. The second function is to receive non-invasively thermal electromagnetic radiation from the tumor by which temperature is sensed and fed back to control the output of the coaxial applicator. 11 figs.

  1. Rapid analysis of hay attributes using NIRS. Final report, Task II alfalfa supply system

    SciTech Connect

    1997-10-24

    This final report provides technical information on the development of a near infrared reflectance spectroscopy (NIRS) system for the analysis of alfalfa hay. The purpose of the system is to provide consistent quality for processing alfalfa stems for fuel and alfalfa leaf meal products for livestock feed. Project tasks were to: (1) develop an NIRS driven analytical system for analysis of alfalfa hay and processed alfalfa products; (2) assist in hiring a qualified NIRS technician and recommend changes in testing equipment necessary to provide accurate analysis; (3) calibrate the NIRS instrument for accurate analyses; and (4) develop prototype equipment and sampling procedures as a first step towards development of a totally automated sampling system that would rapidly sample and record incoming feedstock and outbound product. An accurate hay testing program was developed, along with calibration equations for analyzing alfalfa hay and sun-cured alfalfa pellets. A preliminary leaf steam calibration protocol was also developed. 7 refs., 11 figs., 10 tabs.

  2. Seismic switch for strong motion measurement

    DOEpatents

    Harben, P.E.; Rodgers, P.W.; Ewert, D.W.

    1995-05-30

    A seismic switching device is described that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period. 11 figs.

  3. An historical mullite fiber-reinforced ceramic composite: Characterization of the wootz' crucible refractory

    SciTech Connect

    Lowe, T.L. ); Merk, N.; Thomas, G. )

    1990-10-01

    Since at least the sixteenth century, the wootz'' ultra-high carbon white cast-iron ingot was produced in India by melting or carburising iron in a crucible. This ingot was forced into sword blades of so-called Damascus steel. The charged crucible was fired in a long (24-hour) single cycle at high temperature (1150-1250{degree}C) in a strongly reducing atmosphere. Raw materials for the refractory vessel are clay and coked'' rice husks. At high temperatures, two phases reinforce the glassy matrix: cristobalite relics of rice husks and a network of mullite crystals. This paper characterizes the microstructure and chemistry of the mullite network in the glassy matrix by means of a combination of techniques: optical microscopy, XRD, SEM, TEM and EDS, and HREM. 13 refs., 11 figs.

  4. A summary of modeling studies of the Nesjavellir geothermal field, Iceland

    SciTech Connect

    Bodvarsson, G.S.; Bjornsson, S.; Gunnarsson, A.; Gunnlaugsson, E.; Sigurdsson,, O. Stefansson, V.; Steingrimsson, B.

    1988-01-01

    The Nesjavellir geothermal field in Iceland is being developed to provide the capital city of Reykjavik and surrounding areas with hot water for space heating. In the last few years, many wells have been drilled at the site and various geothermal studies have been conducted. The main upflow to the system is underneath the nearby Hengill volcano, and the natural recharge rate and enthalpy are estimated to be 65 kg/s and 1850 kJ/kg, respectively. An extensive vapor zone is believed to be present in the upflow region. Permeabilities and porosities of the system range between 1 and 50 md and 1 and 10 percent, respectively. In this paper, the characteristics of the Nesjavellir field are described and a three-dimensional numerical model of the resource in discussed. 15 refs., 11 figs., 1 tab.

  5. Use of separate ZnTe interface layers to form ohmic contacts to p-CdTe films

    DOEpatents

    Gessert, T.A.

    1999-06-01

    A method of is disclosed improving electrical contact to a thin film of a p-type tellurium-containing II-VI semiconductor comprising: depositing a first undoped layer of ZnTe on a thin film of p-type tellurium containing II-VI semiconductor with material properties selected to limit the formation of potential barriers at the interface between the p-CdTe and the undoped layer, to a thickness sufficient to control diffusion of the metallic-doped ZnTe into the p-type tellurium-containing II-VI semiconductor, but thin enough to minimize affects of series resistance; depositing a second heavy doped p-type ZnTe layer to the first layer using an appropriate dopant; and depositing an appropriate metal onto the outer-most surface of the doped ZnTe layer for connecting an external electrical conductor to an ohmic contact. 11 figs.

  6. Metabolic encephalopathy in Egyptian children.

    PubMed

    Hindawy, A; Gouda, A; El-Ayyadi, A; Megahed, H; Bazaraa, H

    2007-01-01

    Fatty Acid Oxidation disorders represent an expanding group of inborn errors of metabolism. Clinical manifestations include episodic encephalopathy, hypoketotic hypoglycemia, Reye like episodes, hepatic, muscular, cardiac affection and sudden death. Analysis of urinary organic acids and plasma fatty acids of 44 clinically suspected patients by Gas Chromatography Mass spectrometry revealed 4 cases of Medium chain acyl-CoA dehydrogenase deficiency (MCADD), 3 cases of Very long chain acyl-CoA dehydrogenase deficiency, 9 cases of multiple defects of acyl-CoA dehydrogenation in addition to 3 patients with other metabolic disorders. Timely detection of these disorders including screening for MCADD can have a favorable impact on the outcome of these patients (Tab. 11, Fig. 3, Ref. 24) Full Text (Free, PDF).

  7. Effect of gasoline composition on stoichiometry and exhaust emissions

    SciTech Connect

    McDonald, C.R.; Lee, G.R.; Otter, G.J. den; Shore, P.R.; Humphries, D.T.

    1994-10-01

    Six full range gasolines were tested in two engines (one with a catalyst) operated at 4 steady states. Engine-out regulated emissions responded to equivalence ratio, {Phi}, in the accepted manner. For both CO and NO{sub x}, there was a characteristic, single emissions response to changes in {Phi}. Changing fuel composition will primarily alter the production of these emissions by modifying the stoichiometric air/fuel ratio, projecting engine operation onto another part of the {Phi} response curve. These {Phi} effects, which are independent of engine design, also determine how operating conditions affect engine-out CO and NO{sub x}. Speciated hydrocarbon measurements at engine-out and tail-pipe confirm results seen in previous test-cycle based programmes. 24 refs., 11 figs., 3 tabs.

  8. Simplified horn antenna parameter estimation using selective criteria

    SciTech Connect

    Ewing, P.D.

    1991-01-01

    An approximation can be used to avoid the complex mathematics and computation methods typically required for calculating the gain and radiation pattern of electromagnetic horn antenna. Because of the curvature of the antenna wave front, calculations using conventional techniques involve solving the Fresnel integrals and using computer-aided numerical integration. With this model, linear approximations give a reasonable estimate of the gain and radiation pattern using simple trigonometric functions, thereby allowing a hand calculator to replace the computer. Applying selected criteria, the case of the E-plane horn antenna was used to evaluate this technique. Results showed that the gain approximation holds for an antenna flare angle of less than 10{degree} for typical antenna dimensions, and the E field radiation pattern approximation holds until the antenna's phase error approaches 60{degree}, both within typical design parameters. This technique is a useful engineering tool. 4 refs., 11 figs.

  9. Ecological Networks: Structure, Interaction Strength, and Stability

    NASA Astrophysics Data System (ADS)

    Bhattacharyya, Samit; Sinha, Somdatta

    The fundamental building blocks of any ecosystem, the food webs, which are assemblages of species through various interconnections, provide a central concept in ecology. The study of a food web allows abstractions of the complexity and interconnectedness of natural communities that transcend the specific details of the underlying systems. For example, Fig. 1 shows a typical food web, where the species are connected through their feeding relationships. The top predator, Heliaster (starfish) feeds on many gastropods like Hexaplex, Morula, Cantharus, etc., some of whom predate on each other [129]. Interactions between species in a food web can be of many types, such as predation, competition, mutualism, commensalism, and ammensalism (see Section 1.1, Fig. 2).

  10. Superconductive radiofrequency window assembly

    DOEpatents

    Phillips, H.L.; Elliott, T.S.

    1998-05-19

    The present invention is a superconducting radiofrequency window assembly for use in an electron beam accelerator. The SRF window assembly has a superconducting metal-ceramic design. The SRF window assembly comprises a superconducting frame, a ceramic plate having a superconducting metallized area, and a superconducting eyelet for sealing plate into frame. The plate is brazed to eyelet which is then electron beam welded to frame. A method for providing a ceramic object mounted in a metal member to withstand cryogenic temperatures is also provided. The method involves a new metallization process for coating a selected area of a ceramic object with a thin film of a superconducting material. Finally, a method for assembling an electron beam accelerator cavity utilizing the SRF window assembly is provided. The procedure is carried out within an ultra clean room to minimize exposure to particulates which adversely affect the performance of the cavity within the electron beam accelerator. 11 figs.

  11. Superconducting radiofrequency window assembly

    DOEpatents

    Phillips, H.L.; Elliott, T.S.

    1997-03-11

    The present invention is a superconducting radiofrequency window assembly for use in an electron beam accelerator. The srf window assembly has a superconducting metal-ceramic design. The srf window assembly comprises a superconducting frame, a ceramic plate having a superconducting metallized area, and a superconducting eyelet for sealing plate into frame. The plate is brazed to eyelet which is then electron beam welded to frame. A method for providing a ceramic object mounted in a metal member to withstand cryogenic temperatures is also provided. The method involves a new metallization process for coating a selected area of a ceramic object with a thin film of a superconducting material. Finally, a method for assembling an electron beam accelerator cavity utilizing the srf window assembly is provided. The procedure is carried out within an ultra clean room to minimize exposure to particulates which adversely affect the performance of the cavity within the electron beam accelerator. 11 figs.

  12. In-plant testing of microbubble column flotation

    SciTech Connect

    Luttrell, G.H.; Mankosa, M.J.; Adel, G.T.; Yoon, R.H.

    1991-01-01

    Testing of micro-bubble column flotation continued. Work during this time frame was concentrated on completion of the automated control and data acquisition system and the factorial test plan for evaluating the performance of the 8-foot column (Tasks 2.5 and 3.3). Preliminary results obtained from the factorial test program indicate that higher frother addition and aeration rates result in a higher separation efficiency. Furthermore, an increase in collector dosage results in higher column yields under most conditions. The Allen-Bradley PLC has been installed and program development completed for control of the 8-foot column. A completely automated start-up and shut-down sequence has been developed. This sequence can be initiated by the operator from a plant floor industrial interface. Instrumentation of the 30-inch column has also been completed. Testing of this instrumentation is currently underway. 11 figs., 5 tabs.

  13. Liquid additives for particulate emissions control

    DOEpatents

    Durham, M.D.; Schlager, R.J.; Ebner, T.G.; Stewart, R.M.; Hyatt, D.E.; Bustard, C.J.; Sjostrom, S.

    1999-01-05

    The present invention discloses a process for removing undesired particles from a gas stream including the steps of contacting a composition containing an adhesive with the gas stream; collecting the undesired particles and adhesive on a collection surface to form an aggregate comprising the adhesive and undesired particles on the collection surface; and removing the agglomerate from the collection zone. The composition may then be atomized and injected into the gas stream. The composition may include a liquid that vaporizes in the gas stream. After the liquid vaporizes, adhesive particles are entrained in the gas stream. The process may be applied to electrostatic precipitators and filtration systems to improve undesired particle collection efficiency. 11 figs.

  14. A cure shrinkage model for analyzing the stresses and strains in encapsulated assemblies

    SciTech Connect

    Chambers, R.S.; Lagasse, R.R.; Guess, T.R.; Plazek, D.J.; Bero, C.

    1992-12-31

    Electrical component assemblies are encapsulated to provide delicate parts with voltage isolation and protection against damage caused by shock, vibration, and harsh atmospheric environments. During cure, thermosetting resins shrink and harden simultaneously. If the natural deformation of the resin is constrained by adhesion to the mold or to relatively stiff embedded components, cure shrinkage stresses are generated in the encapsulant. Subsequent cooling or thermal cycling produces additional stresses that are caused by the mismatches in thermal strains among the materials in the encapsulated assembly. Although cure shrinkage stresses frequently are neglected because they are considerably smaller than thermal stresses, cure shrinkage stresses can cause delamination or fractures in the encapsulant, since the partially cured resin is not as tough as the fully cured material. Cracks generated during cure can compromise performance (e. g., permit dielectric breakdown), degrade a component`s protection, and grow under subsequent thermal cycling producing residual stresses that differ from those found in uncracked assemblies. 3 refs., 11 figs.

  15. A cure shrinkage model for analyzing the stresses and strains in encapsulated assemblies

    SciTech Connect

    Chambers, R.S.; Lagasse, R.R.; Guess, T.R. ); Plazek, D.J.; Bero, C. . Dept. of Materials Science and Engineering)

    1992-01-01

    Electrical component assemblies are encapsulated to provide delicate parts with voltage isolation and protection against damage caused by shock, vibration, and harsh atmospheric environments. During cure, thermosetting resins shrink and harden simultaneously. If the natural deformation of the resin is constrained by adhesion to the mold or to relatively stiff embedded components, cure shrinkage stresses are generated in the encapsulant. Subsequent cooling or thermal cycling produces additional stresses that are caused by the mismatches in thermal strains among the materials in the encapsulated assembly. Although cure shrinkage stresses frequently are neglected because they are considerably smaller than thermal stresses, cure shrinkage stresses can cause delamination or fractures in the encapsulant, since the partially cured resin is not as tough as the fully cured material. Cracks generated during cure can compromise performance (e. g., permit dielectric breakdown), degrade a component's protection, and grow under subsequent thermal cycling producing residual stresses that differ from those found in uncracked assemblies. 3 refs., 11 figs.

  16. Atmospheric performance of the special-purpose Solar Energy Research Institute (SERI) thin-airfoil family

    SciTech Connect

    Tangler, J; Smith, B; Jager, D; Olsen, T

    1990-09-01

    The Solar Energy Research Institute (SERI), in cooperation with SeaWest Energy Group, has completed extensive atmospheric testing of the special-purpose SERI thin-airfoil family during the 1990 wind season. The purpose of this test program was to experimentally verify the predicted performance characteristics of the thin-airfoil family on a geometrically optimized blade, and to compare it to original-equipment blades under atmospheric wind conditions. The tests were run on two identical Micon 65/13 horizontal-axis wind turbines installed side-by-side in a wind farm. The thin-airfoil family 7.96 m blades were installed on one turbine, and AeroStar 7.41 m blades were installed on the other. This paper presents final performance results of the side-by-side comparative field test for both clean and dirty blade conditions. 7 refs., 11 figs., 1 tab.

  17. Radiative power and electron cooling rates for oxygen in steady-state and transient plasmas at densities beyond the coronal limit

    SciTech Connect

    Keane, C.; Skinner, C.H.

    1986-01-01

    We have developed a time-dependent, collisional-radiative model to calculate radiative power and electron cooling rates for oxygen at intermediate densities (10/sup 16/ cm/sup -3/ less than or equal to n/sub e/ less than or equal to 10/sup 20/ cm/sup -3/) where the usual coronal approximation is not valid. Large differences from coronal values are predicted. The behavior of the steady-state radiative power loss coefficient, L/sub Z, is investigated as the electron density is increased. Generalized power loss coefficients applicable to transient plasmas are derived and applied to ionizing and recombining oxygen plasmas. Time-dependent effects are found to play a large role both in terms of the total radiated power and the net electron energy loss rate. 41 refs., 11 figs.

  18. Investigation of the acidic properties of ZrO{sub 2} modified by SO{sub 4}{sup 2{minus}} anions

    SciTech Connect

    Kustov, L.M.; Kazansky, V.B.; Figueras, F.; Tichit, D.

    1994-11-01

    Zirconium dioxide modified by sulfate anions was investigated using diffuse reflectance IR spectroscopy. It was found that this modification enhanced the strength of both Bronsted acid sites (terminal or bridging ZrOH groups) and Lewis acid sites (low-coordinate Zr ions). However, Bronsted acid sites with enhanced strength appeared to be weaker than bridging OH groups in zeolites. Modification also created protons with a new environment. These protons were assumed to form multicenter bonds with oxygen atoms of SO{sub 4}{sup 2{minus}} anions or with neighboring basic oxygen and to possess acidic properties, comparable to those of protons in zeolites. Low-temperature ethylene and cyclopropane oligomerization and H-D exchange were shown to proceed on sulfated zirconia, presumably with participation of such sites. 25 refs., 11 figs., 1 tab.

  19. Federal offshore statistics: 1992. Leasing, exploration, production, and revenues as of December 31, 1992

    SciTech Connect

    Francois, D.K.

    1993-12-31

    The Outer Continental Shelf Lands Act, enacted in 1953 and amended several times, charges the Secretary of the Interior with the responsibility for administering and managing mineral exploration and development of the outer continental shelf, as well as for conserving its natural resources. This report documents the following: Federal offshore lands; offshore leasing activity and status; offshore development activity; offshore production of crude oil and natural gas; Federal offshore oil and natural gas sales volume and royalties; revenue from Federal offshore leases; disbursement of Federal offshore revenue; reserves and resource estimates of offshore oil and natural gas; oil pollution in US and international waters; and international activities and marine minerals. 11 figs., 83 tabs.

  20. Some nuclear data needs in astrophysics

    SciTech Connect

    Mathews, G.J.; Bauer, R.W.; Bloom, S.D.; Haight, R.C.; Howard, W.M.; Takahashi, K.; Ward, R.A.

    1985-05-01

    In this paper we discuss a number of astrophysical environments and how improved nuclear data could facilitate a better understanding of them. One area of interest includes proton and alpha-particle reactions with unstable nuclei which are necessary for understanding the nucleosynthesis and energy generation in hot hydrogen-burning environments. Efforts underway at LLNL and elsewhere to develop the technology for the measurement of these reaction rates are discussed. Heavy-element nucleosynthesis in the late stages of red-giant stars and supernovae requires a complete network of neutron capture rates and beta-decay rates for nuclei near and far from stability. Experimental and theoretical efforts at LLNL to supply the input data and to model the nucleosynthetic environments will be outlined. Suggestions are made as to which nuclear data are most critical for the various scenarios. 42 refs., 11 figs., 1 tab.