نتایج جستجو برای: elemental composition
تعداد نتایج: 276086 فیلتر نتایج به سال:
The elemental composition was investigated and applied for identifying the sex and habitat of dugongs, in addition to distinguishing dugong tusks and teeth from other animal wildlife materials such as Asian elephant (Elephas maximus) tusks and tiger (Panthera tigris tigris) canine teeth. A total of 43 dugong tusks, 60 dugong teeth, 40 dolphin teeth, 1 whale tooth, 40 Asian elephant tusks and 20...
Seven particles captured by the Stardust Interstellar Dust Collector and returned to Earth for laboratory analysis have features consistent with an origin in the contemporary interstellar dust stream. More than 50 spacecraft debris particles were also identified. The interstellar dust candidates are readily distinguished from debris impacts on the basis of elemental composition and/or impact tr...
The metal composition of finished wine is a function of the metals present in the grapes as well as those introduced by viticultural and enological practices [1]. Most research so far has focused on elemental profiling for the potential determination of the geographical origin of wine. However, in previous studies, the correlation between the trace element profile of vineyard soil and wine made...
An application of scanning Auger microscopy with ion etching technique and effective compensation of thermal drift of the surface analyzed area is proposed for direct local study of composition distribution in the bulk of single nanoislands. For GexSi1 - x-nanoislands obtained by MBE of Ge on Si-substrate gigantic interdiffusion mixing takes place both in the open and capped nanostructures. Lat...
We measured the elemental compositions of material from 23 particles in aerogel and from residue in seven craters in aluminum foil that was collected during passage of the Stardust spacecraft through the coma of comet 81P/Wild 2. These particles are chemically heterogeneous at the largest size scale analyzed ( approximately 180 ng). The mean elemental composition of this Wild 2 material is cons...
Nitrogen (N) is a fundamental component of nucleotides and amino acids and is often a limiting nutrient in natural ecosystems. Thus, study of the N content of biomolecules may establish important connections between ecology and genomics. However, while significant differences in the elemental composition of whole organisms are well documented, how the flux of nutrients in the cell has shaped th...
UNLABELLED The efficacy of enteral nutrition as primary therapy of active Crohn's disease is controversial. The aim of the study was to compare by meta-analysis the likelihood of clinical response to liquid diet therapy vs. corticosteroids and to assess the importance of formula composition to efficacy. METHODS Randomised controlled trials comparing exclusive enteral nutrition with corticoste...
X-ray microanalysis has the potential to extend beyond high resolution element mapping of the obvious and not-so-obvious. The real power of X-ray microanalysis is the speed and accuracy with which it can enable true discovery – uncovering the unexpected chemical phase(s) that element-based image analysis alone cannot detect given the limitations of distilling massive amounts of spectral data in...
The elemental composition of proteins influences the quantities of different elements required by organisms. Here, we considered variation in the sulphur content of whole proteomes among 19 Archaea, 122 Eubacteria and 10 eukaryotes whose genomes have been fully sequenced. We found that different species vary greatly in the sulphur content of their proteins, and that average sulphur content of p...
The elemental composition of three lots of vitamin-free Casamino Acids (Difco) was determined using X-ray fluorescence, atomic absorption, and colorimetric techniques.
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