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  • Solid-State Physics  (2)
  • Animals  (1)
  • Coated Pits, Cell-Membrane/*physiology  (1)
  • 1
    Publication Date: 2008-08-12
    Description: The domestication of cattle, sheep and goats had already taken place in the Near East by the eighth millennium bc. Although there would have been considerable economic and nutritional gains from using these animals for their milk and other products from living animals-that is, traction and wool-the first clear evidence for these appears much later, from the late fifth and fourth millennia bc. Hence, the timing and region in which milking was first practised remain unknown. Organic residues preserved in archaeological pottery have provided direct evidence for the use of milk in the fourth millennium in Britain, and in the sixth millennium in eastern Europe, based on the delta(13)C values of the major fatty acids of milk fat. Here we apply this approach to more than 2,200 pottery vessels from sites in the Near East and southeastern Europe dating from the fifth to the seventh millennia bc. We show that milk was in use by the seventh millennium; this is the earliest direct evidence to date. Milking was particularly important in northwestern Anatolia, pointing to regional differences linked with conditions more favourable to cattle compared to other regions, where sheep and goats were relatively common and milk use less important. The latter is supported by correlations between the fat type and animal bone evidence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Evershed, Richard P -- Payne, Sebastian -- Sherratt, Andrew G -- Copley, Mark S -- Coolidge, Jennifer -- Urem-Kotsu, Duska -- Kotsakis, Kostas -- Ozdogan, Mehmet -- Ozdogan, Asly E -- Nieuwenhuyse, Olivier -- Akkermans, Peter M M G -- Bailey, Douglass -- Andeescu, Radian-Romus -- Campbell, Stuart -- Farid, Shahina -- Hodder, Ian -- Yalman, Nurcan -- Ozbasaran, Mihriban -- Bicakci, Erhan -- Garfinkel, Yossef -- Levy, Thomas -- Burton, Margie M -- England -- Nature. 2008 Sep 25;455(7212):528-31. doi: 10.1038/nature07180. Epub 2008 Aug 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Organic Geochemistry Unit, Bristol Biogeochemistry Research Centre, School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK. r.p.evershed@bristol.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18690215" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cattle/*physiology ; Ceramics/analysis ; Dairying/*history ; Europe ; Europe, Eastern ; Fatty Acids/analysis ; Goats ; History, Ancient ; Humans ; Meat ; Milk/chemistry/*history/*utilization ; Sheep
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1985-11-29
    Description: Clathrin-coated membranes are intimately associated with a variety of protein transport processes in eukaryotic cells, yet no direct test of clathrin function has been possible. The data presented demonstrate that Saccharomyces cerevisiae does not require clathrin for either cell growth or protein secretion. Antiserum to the yeast clathrin heavy chain has been used to isolate a molecular clone of the heavy chain gene (CHC1) from a library of yeast DNA in lambda gt11. Clathrin-deficient mutant yeast have been obtained by replacing the single chromosomal CHC1 gene with a disrupted version of the cloned DNA. Cells harboring a nonfunctional chc1 allele produce no immunoreactive heavy chain polypeptide, and vesicles prepared from mutant cells are devoid of clathrin heavy and light chains. Although clathrin-deficient cells grow two to three times more slowly than normal, secretion of invertase occurs at a nearly normal rate. Therefore protein transport through the secretory pathway is not obligately coupled to the formation of clathrin-coated vesicles.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Payne, G S -- Schekman, R -- New York, N.Y. -- Science. 1985 Nov 29;230(4729):1009-14.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2865811" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Transport ; *Cell Physiological Phenomena ; Clathrin/genetics/immunology/*physiology ; Coated Pits, Cell-Membrane/*physiology ; Endosomes/*physiology ; Eukaryotic Cells/*physiology ; Genes ; Genes, Fungal ; Genetic Engineering ; Glycoside Hydrolases/secretion ; Macromolecular Substances ; Molecular Weight ; Proteins/*secretion ; Saccharomyces cerevisiae/genetics ; beta-Fructofuranosidase
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2019-08-17
    Description: Chromium doped zinc selenides crystals have recently been demonstrated to be a promising material for near-IR room temperature tunable lasers which has an emission range of 2-3 pm. In this study, a new diffusion doping process has been developed for incorporation of Cr(+2) ion into ZnSe wafers. This process has been successfully performed under isothermal conditions, at temperatures above 800 degrees Celsius. Concentrations in excess of 10(exp 19) Cr(+2) ions/cu cm, an order of magnitude larger than previously reported in melt grown ZnSe material, have been obtained. The diffusivity was estimated to be about 10-* sq cm/sec using a classical diffusion model. Resistivity was derived from current-voltage measurements and in the 107-10(exp 16) Ohms-cm and increased as function of Cr concentration.
    Keywords: Solid-State Physics
    Type: URC97069 , NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment; 1; 401-406
    Format: application/pdf
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  • 4
    Publication Date: 2019-08-16
    Description: Chromium doped zinc selenide crystal have recently been demonstrated to be a promising material for near-IR room temperature tunable lasers which have an emission range of 2-3 micrometers. In this study a new diffusion doping process has been developed for incorporation of Cr(+2) ion into ZnSe wafers. This process has been successfully performed under isothermal conditions, at temperatures above 800 C. Concentrations in excess of 10(exp 19) Cr(+2) ions/cu cm, an order of magnitude larger than previously reported in melt grown ZnSe material, have been obtained by diffusion doping, as estimated from optical absorption measurements. The diffusivity was estimated to be about 10(exp -8) sq cm/sec using a thin film diffusion model. Resistivity was derived from current-voltage measurements and in the range of 10(exp 13) and 10(exp 16) omega-cm. The emission spectra and temperature dependent lifetime data will also be presented and discussed.
    Keywords: Solid-State Physics
    Type: The First National Student Conference: NASA University Research Centers at Minority Institutions; 111-114; NASA-CR-205049
    Format: text
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