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  • STRUCTURAL MECHANICS  (1,510)
  • Life and Medical Sciences
  • 1970-1974  (2,699)
  • 1920-1924  (118)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    6,8-Dihydroxypurine: A novel growth factor for mammalian cells in vitro, isolated from a commercial peptone (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 81 (1973), S. 281-284 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A substance promoting the growth of mammalian cells in vitro has been isolated from Bacto-peptone (Difco Labs., Detroit) and identified as 6,8-dihydroxypurine. This compound, which is isomeric with xanthine(2,6-dihydroxypurine), enhances the growth of one Chinese hamster and some other cell lines; xanthine itself is inactive. The biological action of the compound is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040810216
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  • 2
    Electronic Resource
    Electronic Resource
    A brief chronicle on Harry Eagle (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 76 (1970), S. 241-252 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040760304
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  • 3
    Electronic Resource
    Electronic Resource
    A Calcium-sensitive lanthanum inhibition of amoeboid movement (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 81 (1973), S. 365-369 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effects of lanthanum ions upon amoeboid movement and upon the redistribution of dense cytoplasmic inclusions following centrifugation were investigated in Amoeba discoides. Treatment with low lanthanum concentrations produced a characteristic inhibited condition in which locomotion ceased while saltatory movements continued. The resorting of stratified cytoplasm by local internal cytoplasmic flow was unaffected. This contrasted with p-hydroxymercuribenzoate treatment which inhibited both locomotion and saltatory movements. The inhibitory effects of lanthanum ions were antagonised by calcium ions but not by magnesium ions. It is reasoned that lanthanum competes for a peripheral binding site thereby disrupting a calcium-mediated regulatory mechanism of amoeboid movement.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040810309
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  • 4
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    A case study in technology utilization: Fracture mechanics (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This review of NASA contributions to the technology of fracture mechanics illustrates a fundamental role of the Space Agency in a single technical area. While primarily pursuing its goal of minimizing the weight of flight hardware, NASA engineers have generated innovations having broad impact in nonaerospace communities. A review is given of how these specific NASA innovations are communicated to the technical community outside the Space Agency, and current application areas are outlined.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-127779
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    A cell line which is temperature-sensitive for cytokinesis (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 80 (1972), S. 253-259 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We have isolated several cell lines which are temperature-sensitive for growth. One of these appears to be temperature-sensitive for cytokinesis. It was isolated from a Syrian hamster cell line by selecting cells which were not killed by 1 μg/ml cytosine arabinoside at 39° but which grew normally at 31°. It shows an increased proportion of binucleate cells when shifted to the non-permissive temperature and time-lapse photomicroscopy shows that a high proportion of attempted mitoses fail at 39°, apparently at the stage of cytokinesis. The cells which have failed to complete mitosis reattach to the plate and have two normal-size nuclei but otherwise behave normally.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040800212
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  • 6
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    A circumferential crack in a cylindrical shell under tension. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A closed cylindrical shell under uniform internal pressure has a slit around a portion of its circumference. Linear shallow shell theory predicts inverse square-root-type singularities in certain of the stresses at the crack tips. This paper reports the computed strength of these singularities for different values of a dimensionless parameter based on crack length, shell radius and shell thickness.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture Mechanics; 8; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A circumferential crack in a cylindrical shell under torsion. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The fully antisymmetric problem for a cylindrical shell with a circumferential crack is considered. The solution of the problem is reduced to that of a system of singular integral equations of the first kind. As an example the torsion of the cylinder is discussed and membrane and bending components of the stress intensity factor ratio are given.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture Mechanics; 8; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    Electronic Resource
    Electronic Resource
    A comparative histological study of mammalian boneResearch supported by grants HD-03677 and HD-50021 from N.I.C.H.D., National Institutes of Health, Bethesda, Md. (1974)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 144 (1974), S. 421-437 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: This report adds to the available information on comparative histology of mammalian bone and introduces a semi-quantitative approach to its study. Bone samples consisted of large fragments of rib tibia and/or femur from humans, laboratory rodents and from animals that died at the Bronx Zoological Gardens. A total of 44 bone specimens representing six mammalian orders were available. Decalcified paraffin-embedded 10 μm histological cross-sections were examined at × 320. Qualitative observations were supplemented with measurements of the frequency and size distributions of Haversian and non-Haversian canals. The relative distribution of lacunae was also ascertained. The standard textbook description of mammalian bone as consisting mainly of secondary osteons was not generally seen except in Primate (especially human) bone. Rats showed a few scattered osteon-like structures, but bones of Marsupialia, Insectivora, Artiodactyla and Carnivora were entirely devoid of them. Generally, vascular bone with longitudinal canals was seen except in Lorisidae which showed a reticular type of bone. The distribution of primary longitudinal canals and the number of “filled” or “apparently empty” lacunae/unit area of bone varied both inter-species and among different areas in the same bone. Large areas of acellular and non-vascular bone were encountered in all specimens. This preliminary study revealed that species differences i bone microstructure involve the relative distribution of the same basic components which lend themselves to quantitative treatment. Comparative investigations of bone histology at many ontogenetic and phylogenetic levels should yield significant quantitative information in bone biology.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051440404
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  • 9
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    A comparative study of tensile fracture mechanisms. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Identification of the failure mechanism characteristic for the more widely used carbon fibers in epoxy matrices under tensile loads as an aid toward improvements and more reliable predictions of the performance of these composites. The presented results pertain to high-strength, high-modulus, and low-modulus fibers in unmodified and modified epoxy novolac matrices.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Composite Materials; 6; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
    Electronic Resource
    Electronic Resource
    A comparative ultrastructural and behavioral study of the antennal sensory sensilla of the parasitoid Cardiochiles nigriceps (hymenoptera:Braconidae)Approved for publication as TA 10689 by the Director, Texas Agricultural Experiment Station in cooperation with the U.S.D.A. Supported in part by a grant-in-aid of research of the Society of the Sigma Xi and Cotton Incorporated CI-71-599. The authors wish to thank Dr. E. L. Thurston, coordinator of the Electron Microscopy Center at Texas A&M University for his advice and use of the facilities during this study. (1974)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 142 (1974), S. 329-349 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Scanning and transmission electron microscopy studies were conducted on the antennal sensory sensilla of the hymenopteran parasitoid, Cardiochiles nigriceps Viereck, of the family Braconidae. Distinct morphological differences were found between the chemoreceptors of the male and female. Curved, non-fluted, thin-walled sensilla were found to be very abundant on the male and restricted in location and number on the female. Trichoid, placoid and fluted basiconic sensilla were numerous on the antennal flagella of both sexes. Smooth basiconic sensilla were restricted in number to one per flagellar segment in both sexes. Behavioral data suggest that bent-tipped, thick-walled sensilla unique to the female are involved in detecting a chemical(s) emitted from the host, Heliothis virescens (Fab.).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051420308
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