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  • 1
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    Carbon isotopic evidence for different feeding patterns in two hyrax species occupying the same habitat (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-08
    Description: The carbon-13/carbon-12 ratios of the carbonate and collagen fractions of bone of the sympatric hyrax species Procavia johnstoni and Heterohyrax brucei indicate that the former obtains most of its diet by grazing while the latter is primarily a browser. The carbon-13/carbon-12 ratios of these fractions in fossil bone will record information about diet if they have not been altered during diagenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Deniro, M J -- Epstein, S -- New York, N.Y. -- Science. 1978 Sep 8;201(4359):906-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17729570" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Enhanced dexamethasone resistance in cystic fibrosis cells: potential use for heterozygote detection and prenatal diagnosis (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-07-14
    Description: Cultured skin fibroblasts from patients with cystic fibrosis (CF) are more resistant to dexamethasone toxicity than are normal cells. We now report that, when fibroblasts cultured from obligate CF heterozygotes are exposed to dexamethasone, they have an intermediate survival compared to normal and homozygous CF cells. When dexamethasone survival was tested on cells from four patients undergoing amniocentesis, cells from a woman at risk of producing a child with CF showed significant dexamethasone resistance, similar to that of fibroblasts derived from lnown CF homozygotes; the other amniotic cell specimens showed dexamethasone sensitivity similar to that of normal skin fibroblasts. These data suggest that the dexamethasone resistance previously observed in skin fibroblasts may also be useful in the prenatal diagnosis of CF.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Breslow, J L -- Epstein, J -- Fontaine, J H -- Forbes, G B -- New York, N.Y. -- Science. 1978 Jul 14;201(4351):180-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/663650" target="_blank"〉PubMed〈/a〉
    Keywords: Amniotic Fluid/cytology ; Cell Survival/drug effects ; Cystic Fibrosis/diagnosis/genetics/*physiopathology ; Dexamethasone/*toxicity ; Drug Resistance ; Female ; Heterozygote ; Homozygote ; Humans ; Pregnancy ; Prenatal Diagnosis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Laser-EXAFS: Fast Extended X-ray Absorption Fine Structure Spectroscopy with a Single Pulse of Laser-Produced X-rays (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-10-19
    Description: The extended x-ray absorption fine structure (EXAFS) spectrum of aluminum has been measured with a nanosecond pulse of soft x-rays generated by a laser-produced plasma. This technique provides a practical alternative to synchrotorn radiation for the acquisition of EXAFS data. It also provides a unique capability for the analysis of molecular structure in highly transient chemical species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mallozzi, P J -- Schwerzel, R E -- Epstein, H M -- Campbell, B E -- New York, N.Y. -- Science. 1979 Oct 19;206(4416):353-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17733684" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Relationship between the oxygen isotope ratios of terrestrial plant cellulose, carbon dioxide, and water (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-04-06
    Description: The ratios of oxygen-18 to oxygen-16 ( (18)O/(16)O) of cellulose purified from two sets of wheat plants grown under conditions similar in all respects except for a large difference in the (18)O/(16)O ratios of the carbon dioxide supplied to them differ by only a small amount. The difference in the (18)O/(16)O ratios of the cellulose is similar to that observed for the (18)O/(16)O ratios of the water present in the plants. These results indicate that the oxygen derived from carbon dioxide undergoes complete exchange with the oxygen of the water in the plant during the synthesis of cellulose and that the (18)O/(16)O ratio of the water inside the plant is the primary influence on the (18)O/(16)O ratio of cellulose in terrestrial plants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Deniro, M J -- Epstein, S -- New York, N.Y. -- Science. 1979 Apr 6;204(4388):51-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17816736" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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