Representative abundances of the chemical elements for use as a solar abundance standard in astronomical and planetary studies are summarized. Updated abundance tables for solar system abundances based on meteorites and photospheric measurements are presented.

... Abstract : The present working values of the solar abundances of 65 chemical elements are listed. The abundance of some elements is based on ...

... Title : The Distribution, Abundance, and Diversity of Birds on Edgewood Arsenal's Chemical Agent Test Area. Descriptive Note : Technical rept. ...

... Also discussed are studies of the solar abundances of chemical elements, solar bismuth content, and solar abundance of boron. ...

... Title : Oxygen Charge State Abundance in the Inner ... IONS, SOURCES, RADIATION, DETECTORS, WIND, CHEMICAL COMPOSITION, SPECTRA ...

The photospheric abundances of the chemical elements which are observed in the coronal spectrum, in the solar wind and in solar energetic particle events, are reviewed. Elements which can be measured in the solar upper layers and whose abundances were rev...

Jan 1, 1972 ... Subject Terms: ABUNDANCE; CHEMICAL ANALYSIS; CHEMICAL COMPOSITION; LUNAR COMPOSITION; LUNAR SOIL; LUNIK LUNAR PROBES; NEUTRON ACTIVATION ...

Photometric data, photometric and spectroscopic stellar parameters, radial velocities, abundance errors, atomic data, chemical abundances of alpha-, iron-peak and s-process elements, Cu and Na, and abundance errors are given for a sample of 59 stars. (4 data files).

It is shown that the chemical composition of cosmic rays at their sources for the elements up to the

... are to further our understanding of the chemical and biological processes which control the abundance and distributions of chemical and biological ...

... Yellowstone National Park (YNP) is unrivaled for the abundance and diversity of ... The bulk of the physical, chemical and isotope data for the thermal ...

... Title : Influence of Chemical, Physical, Biological and Geochemical Processes of ... minimum zone on organic matter abundance and regeneration ...

... data, particle abundance, volumes, and ... CHLORINE, SPECTROMETERS, CHEMICAL ANALYSIS ... INDEX, ENERGY, CHEMICALS, DISTRIBUTION ...

Mare Tranquillitatis surface chemical composition data from Surveyor 5, comparing element abundances

The chemical composition of comet nuclei and the factors affecting it are discussed, summarizing the

... Title : DETERMINATION OF THE ISOTOPIC RATIOS OF ... Descriptors : *CARBON, *HYDROGEN, ABUNDANCE, CHEMICAL ANALYSIS, ISOTOPES. ...

Equilibrium abundances calculated for a system of over 500 compounds of 27 selected elements along a

... of spectral lines, utilizing a model atmosphere, with the primary aim of determining the abundance of as large a number of chemical elements as ...

An analysis of the abundances of the chemical elements in the atmospheres of main-sequence stars shows that the abundance of the iron-peak elements compared to iron itself remains constant throughout the range of chemical composition, whereas the abundances of heavier and lighter elements ...

We present chemical abundances in a sample of luminous cool stars located within 50 pc of the Galactic Center. Abundances of C, N, O, Ca and Fe are derived using high-resolution infrared spectra in the H- and K-bands. We report solar iron abundance, enhanced alpha element abundances, and ...

The present status of knowledge of the Sun's chemical composition is reviewed. Photospheric, chromospheric and coronal abundances of the different elements are first studied separately and then compared to check the chemical homogeneity of the solar atmos...

The determination of chemical abundances of the interstellar medium is related to three different areas of astronomy: pregalactic conditions, stellar evolution, and chemical evolution of galaxies. The observed abundances permit the testing of theories associated with these areas. Knowledge of the ...

The determination of chemical abundances of the interstellar medium is related to three different areas of astronomy: pregalactic conditions, stellar evolution, and chemical evolution of galaxies. The observed abundances permit the testing of theories associated with these areas. Knowledge of the ...

An extensive project for the investigation of abundances, especially of light elements, in F-type stars is described and some preliminary results are given.

Stothers, R.B., 1988: Abundance effects on the Cepheid distance scale. ... Since the slope of the predicted PL relation is independent of chemical ...

Sep 1, 1981 ... Subject Terms: ABUNDANCE; CHEMICAL COMPOSITION; COSMIC RAYS; ENERGETIC PARTICLES ; ENERGY SPECTRA; HIGH ALTITUDE BALLOONS; ...

... cropping cycle, mosquito species succession, and the physical chemical factors affecting their abundance in the Mwea rice agroecosystem in Kenya. Materials ... ...

... nitric oxide(NO) comprising mixing natural abundance nitric oxide in an ... dioxide, Light sources, Frequency, Isotopes, Chemical reactions, Inventions ...

... Pure and Applied Chemistry�s (IUPAC) Commission on Isotopic Abundances and Atomic Weights is publishing a new table ... and industry. For example, precise measurements of the abundances of ... honey. Iso...

Jun 16, 2011... the abundance and distribution of a pest plant where chemical and ... Primary objectives have been direct reduction in abundance of the ...

We carried systematic study of chemical abundances in the. Strontium Filament found in the ... multilevel non-LTE models for each ion. Since the atomic ...

Macrobenthic community responses can be measured through concerted changes in univariate metrics, including species richness, total abundance, and total biomass. The classic model of pollution effects on marine macroinvertebrate communities recognizes that species/abundance/bioma...

The chemical abundances of O-stars, zeta Ori, lambda Ori, delta Ori, zeta Pup and zeta Oph, were obtained from the ASCA observations. The abundances derived from simple isothermal optically-thin model fits for the stars are significantly smaller than cosmic abundances for certain elements. If the derived ...

The deuterium abundances inferred from observations of the interstellar medium (ISM) within 1-2 kpc of the Sun range over a factor of 3 and the corresponding oxygen abundances show an even larger dispersion. While the lower D (and O) abundances likely result from depletion on to dust, the higher D abundances are ...

CHEMICAL CONSTRAINTS ON THE WATER AND TOTAL OXYGEN ABUNDANCES IN THE DEEP ATMOSPHERE OF SATURN- pendent constraints on the water and total oxygen abundances of Saturn's deep atmosphere. A lower limit indicates a water en- richment on Saturn of 1.9�6.1 times the solar system abundance (H2O/H2 � 8:96 ; 10�4

A chemical system involving carbon and hydrogen is used to obtain steady-state abundances of a number of molecules over a wide range of densities. The calculated CH abundance agrees well with the astronomical observations. For reasonable values of the rate coefficients, the present system of reactions cannot explain, simultaneously, ...

Steady-state abundances are presented for a system of chemical reactions relevant to interstellar clouds. A number of reactions with recently measured rates are included. The system is solved for densities of 10 cm/sup -3/ to 10/sup 6/ cm/sup -3/ with various values for the cosmic element abundances. Of the 100 species in the scheme, ...

Unstable, discrete modes are found to exist in the secular spectrum of stars when perturbations of chemical abundances are considered. The time scales of the instabilities correspond to the evolution time scales. Such instabilities have been found in all of the models tested. (auth)

Physical and chemical parameters associated with phytoplankton abundance and periodicity were studied in a pond (S-3) at the Auburn University Fisheries Research Unit, Auburn, Alabama, from February 1, 1974 to September 6, 1974. Data involving water tempe...

The present working values of the solar abundances of 65 chemical elements are listed. The abundance of some elements is based on one line only, and the results may be erroneous. A separate list is given showing isotope ratios of eight elements that have ...

Mar 1, 2011 ... temperature determination, chemical abundance determination, and the question about the energy sources for the high temperature regions. ...

... Wetland functions are the physical, chemical, and biological ... transformation, production export, wildlife diversity/abundance, aquatic diversity ...

Despite their high abundance, the functional ecology, and particularly the trophic relationships of Antarctic amphipods are poorly understood. ...

Despite their high abundance, the functional ecology, and particularly the trophic relationships of Antarctic amphipods are poorly understood. ...

Determine the abundance of deuterium and He-3 in the local interstellar medium as constraints on Big Bang and galactic chemical evolution theories ...

... Title : Retrieval of Kinetic Temperature and Carbon Dioxide Abundance From Non ... constituents, and the key radiative and chemical sources and ...

... These investigations were supported by analytical chemical, biochemical, pathological ... Recent changes in the abundance of certain organisms in ...

Sep 21, 2011 ... Chemical Taxonomy Presenter: Boncho P. Bonev () ... accurate abundance measurements has begun to permit a taxonomic ...

... Abstract : The abundance ratio of 13C enriched carbon ... Descriptors : *MASS SPECTROSCOPY, *CARBON, CHEMICAL ANALYSIS, ISOTOPES ...

... Corporate Author : CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ... ALL OF WHICH YIELD LOW ABUNDANCE IN THE ...

Glutamate, one of the most abundant chemical messengers can inflict massive damage if it is accidentally spilled into brain tissue in large amounts.

... Abstract : Variations in the abundances of elements and radiogenic isotopes in mantle derived periodotites and volcanic rocks are chemical ...

... C-13 SPECTRA WERE OBTAINED AT NATURAL ABUNDANCE, THE N ... OF THIS TECHNIQUE FOR DETECTING CHEMICAL INTERACTIONS IS ...

... Pagination or Media Count : 1. Descriptors : *INLAND WATERWAYS, *IONS, *SEA WATER, ABUNDANCE, CHEMICAL ANALYSIS. ...

The greenhouse gas carbon dioxide is the most abundant chemical (96 percent) in the Venusian atmosphere. The large. Venus: A Global Greenhouse ...

We present a review about the relevance of the paper by M. Peimbert and R. Costero, 1969, BOTT, 5, 31, 3, on the chemical abundance determinations of H II regions. We analize the observational evidence in favor of the presence of temperature variations inside gaseous nebulae. We make a brief mention of the methods used to estimate the contribution of the ...

Jun 1, 1970 ... Subject Terms: ABUNDANCE; CHEMICAL COMPOSITION; EARTH CORE; GEOCHEMISTRY; IRON; METEORITIC COMPOSITION; SULFUR ...

... These depth profiles were used to consider regulation of P(org) distribution by biomass abundance, chemical structure, and physical protection ...

Feb 1, 1979 ... Subject Terms: ABUNDANCE; CHEMICAL ANALYSIS; CHONDRITES; CHONDRULE; IRON; MASS SPECTROSCOPY; METAMORPHISM (GEOLOGY); METEORITIC COMPOSITION; ...

The Sagittarius dwarf spheroidal galaxy is slowly disintegrating and merging with the Milky Way. The detailed chemical abundance studies of several stars belonging to this galaxy have indicated quite a wide range of metallicities -1.5 < [Fe/H]< +0.1 and some abundance differences when compared with the Milky Way stars. In this ...

Biological effects data with single chemicals are far more abundant than with mixtures. Yet, environmental exposures to chemical mixtures, for example near hazardous waste sites or nonpoint sources, are very common and using test data from single chemical...

Biological effects data with single chemicals are far more abundant than with mixtures. et, environmental exposures to chemical mixtures, for example near hazardous waste sites or nonpoint sources, are very common and using test data from single chemicals to approximate effects o...

Unlike acoustic and visual communication, chemical communication cues have not been viewed in the background of a chemically noisy habitat. Species with similar chemical cues may not only directly interfere with each other's communication channels, but the presence and abundance of other species may...

that result from the complexity of the biosphere? Since abundance of chemical receptors in biological systemsChemicals for tomorrow J. Ranke, B. Jastorff Centre for Environmental Research and Environmental and technological aptitude. In the case of chemical products legal compliance and public acceptance are ...

If additivity is known or assumed, the toxicity of a chemical mixture may be predicted from the dose response curves of the individual chemicals comprising the mixture. As single chemical data are abundant and mixture data sparse, mixture risk methods that utilize single chemical...