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  • 1
    ISSN: 1432-2242
    Keywords: Key words Soybean ; Glycine max (L.) Merr ; Linolenic acid ; Omega-3 fatty acid desaturase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Reducing the linolenic acid (18 : 3ω  3,6,9) concentration of soybean [Glycine max (L.) Merr.] oil may lessen the need for chemical hydrogenation and enhance flavor stability. Soybean genotypes A5 and A23 have reduced linolenic acid concentration compared with current cultivars. Seed linolenic acid is synthesized primarily by the ω-3 fatty acid desaturase located in the microsomes. The objective of this research was to study whether this enzyme has a role in reducing the fatty acid levels in the soybean genotypes A5 and A23. DNA from A5 and A23 was analyzed by gel-blot hybridization with a cDNA encoding the ω-3 fatty acid desaturase. A5 and lines selected from it have a DNA fragment missing compared to A23 and lines with normal linolenic acid concentration. Seventy F4:5 lines from a population segregating for linolenic acid concentration were scored for presence or absence of the fragment. The absence of the fragment was significantly (P?0.0001) associated with a reduced linolenic acid level and accounted for 67% of the variation for linolenic acid in the population. These results suggest that the reduced linolenic acid concentration in A5 was at least partially the result of a full or partial deletion of a microsomal ω-3 desaturase gene. No DNA polymorphisms were found for the desaturase gene in A23, so no mutations could be studied in this line.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1995-09-08
    Description: Muscarinic cholinergic activity in the human arcuate nucleus at the ventral medullary surface is postulated to be involved in cardiopulmonary control. A significant decrease in [3H]quinuclidinyl benzilate binding to muscarinic receptors in the arcuate nucleus is now shown to occur in sudden infant death syndrome (SIDS) infants, compared to infants dying acutely of known causes. In infants with chronic oxygenation abnormalities, binding is low in other nuclei, as well as in the arcuate nucleus. The binding deficit in the arcuate nucleus of SIDS infants might contribute to a failure of responses to cardiopulmonary challenges during sleep.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kinney, H C -- Filiano, J J -- Sleeper, L A -- Mandell, F -- Valdes-Dapena, M -- White, W F -- P30-HD18655/HD/NICHD NIH HHS/ -- R01-HD20991/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1995 Sep 8;269(5229):1446-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Children's Hospital, Boston, MA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7660131" target="_blank"〉PubMed〈/a〉
    Keywords: Acute Disease ; Anoxia/metabolism ; Arcuate Nucleus of Hypothalamus/*metabolism ; Autoradiography ; Brain Stem/metabolism ; Chronic Disease ; Humans ; Infant ; Infant, Newborn ; Quinuclidinyl Benzilate/*metabolism ; Receptors, Muscarinic/*metabolism ; Sudden Infant Death/*etiology
    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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