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  • DNA/genetics  (2)
  • STRUCTURAL MECHANICS
  • 2005-2009
  • 1990-1994
  • 1980-1984  (3)
  • 1980  (3)
  • 1
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    Frontiers of the biological sciences (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-07-04
    Description: The history of the molecular revolution in biology is described, emphasizing its dependence on the emergence of bacterial genetics, the fusion of genetics and biochemistry, and the development of greatly improved techniques for studying macromolecules. Central concepts have included molecular information transfer, both by nucleic acids and by allosteric proteins; the spontaneous conversion of one-dimensional information into three-dimensional structures; and the extraordinary unity in the molecular mechanisms underlying the rich diversity of biology. The merging of molecular and morphological studies, to yield the very broad field of cell biology, is described more briefly, as are also some present frontiers in several areas of biology that present challenges at other levels of organization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, B D -- New York, N.Y. -- Science. 1980 Jul 4;209(4452):78-89.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7025206" target="_blank"〉PubMed〈/a〉
    Keywords: Allergy and Immunology/trends ; Allosteric Regulation ; Biological Evolution ; Biology/*history ; DNA/genetics ; DNA, Recombinant ; Embryology/trends ; Gene Expression Regulation ; Genetic Engineering ; Genetics/*trends ; History, 20th Century ; Membranes/physiology ; Molecular Biology/trends ; Neoplasms/etiology ; Neurology/trends ; Nucleic Acid Conformation ; Protein Biosynthesis ; Ribosomes/physiology ; Transcription, Genetic
    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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    DNA sequences mediating class switching in alpha-immunoglobulins (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-09-19
    Description: Immunoglobulin class switching involves specific DNA rearrangements of the gene segments coding for heavy chain constant regions (CH) during B lymphocyte differentiation. In two different cases of C mu to C alpha switching examined here (T15 and M603) and one taken from the literature (MC101), three different sites on the 5' side of C mu and three different sites on the 5' side of C alpha are joined together in the process of CH switching. The sequences surrounding the three germ-line C alpha sites of recombination are highly conserved blocks of 30 nucleotides that may serve as recognition sequences for CH switching to the C alpha gene. This putative recognition sequence is repeated 17 times in approximately 1400 nucleotides of the germ-line Calpha 5' flanking sequence. The lack of homology between this C alpha sequence and sequences reported for the C gamma 1 and C gamma 2b switch sites suggests that heavy chain switching is mediated by class-specific recognition sequences and, presumably, class-specific regulatory mechanisms. In addition, it appears that in one example (MC101) CH switching progressed from C mu to C alpha to C gamma 1. This switching pathway may present difficulties for the simple deletional model of CH switching.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, M M -- Kim, S K -- Hood, L E -- AI 09072/AI/NIAID NIH HHS/ -- GM 07616/GM/NIGMS NIH HHS/ -- PCM76-81546/PC/NCI NIH HHS/ -- New York, N.Y. -- Science. 1980 Sep 19;209(4463):1360-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6774415" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/*immunology ; Base Sequence ; DNA/genetics ; *Genes ; Immunoglobulin Constant Regions/*genetics ; Immunoglobulin Heavy Chains/*genetics ; Immunoglobulin Variable Region/genetics ; Immunoglobulin alpha-Chains/*genetics ; Immunoglobulin mu-Chains/*genetics ; Immunoglobulins/*genetics ; Mice ; Myeloma Proteins/genetics ; Recombination, Genetic
    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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    Stress analysis and buckling of J-stiffened graphite-epoxy panel (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A graphite epoxy shear panel with bonded on J stiffeners was investigated. The panel, loaded to buckling in a picture frame shear test is described. Two finite element models, each of which included the doubler material bonded to the panel skin under the stiffeners and at the panel edges, were used to make a stress analysis of the panel. The shear load distributions in the panel from two commonly used boundary conditions, applied shear load and applied displacement, were compared with the results from one of the finite element models that included the picture frame test fixture.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-1607 , L-13256
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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