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  • 1985-1989  (7)
  • 1935-1939
  • 1860-1869
  • 1989  (7)
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Material
Years
  • 1985-1989  (7)
  • 1935-1939
  • 1860-1869
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Aerosol direct fluorination of C1 and C2 chlorocarbons (1989)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 28 (1989), S. 1547-1549 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00094a019
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acceleration instability in elastic-plastic solids. I. Numerical simulations of plate acceleration (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2838-2858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Acceleration instability occurs when a body is accelerated by surface tractions. This situation resembles classic Rayleigh–Taylor instability, but differs due to the temporal and spatial variation of the stress field in the accelerated body caused by wave propagation and the time dependence of the accelerating forces. These factors produce phenomena in acceleration instability which are without precedent in classical Rayleigh–Taylor analyses. An extensive numerical study of acceleration instability using a Lagrangian finite-difference wavecode has determined the influence of various parameters including amplitude and wavelength of initial surface perturbations, material yield strength, and time dependence of the driving force. The nature of the criteria determining stability or instability is established, and the fundamental physical quantity controlling perturbation growth at an interface is shown to be the local stress gradient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344190
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acceleration instability in elastic-plastic solids. II. Analytical techniques (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2859-2872 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Acceleration instability occurs when a body is accelerated by surface tractions. This situation resembles classic Rayleigh–Taylor instability, but differs due to the temporal and spatial variation of the stress field in the accelerated body caused by wave propagation and the time dependence of accelerating forces. We wish to investigate the extent to which the acceleration instability response of elastic-plastic solids can be approximately modeled using a modal or one-degree-of-freedom technique assuming incompressible flow. We find that neither the response equation derived assuming a linear elastic shear response nor the so-called "minimum amplitude'' instability criterion derived from rigid plastic analyses is sufficient to describe overall stability characteristics at very large driving pressures. Several versions of the modal approximation technique for an elastic-plastic material response are derived and compared. The features which must be included in such an analysis in order to obtain qualitative agreement with instability results seen in numerical experiments are indicated. However, quantitative agreement with numerical results cannot be obtained in all cases. The sources of the disagreement and the regions of applicability of the analysis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344191
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Defense gene expression in elicitor-treated cell suspension cultures of french bean cv. Imuna (1989)
    Springer
    Plant cell reports 8 (1989), S. 504-507 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell suspension cultures of bean (Phaseolus vulgaris) cv. Imuna accumulated isoflavonoid phytoalexins on exposure to elicitor from the phytopathogenic fungus Colletotrichum lindemuthianum (CL). This was preceeded by rapid increases in the activities of phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS). However, the patterns of expression of PAL and CHS genes differed from those observed in cultures of a previously studied bean cultivar. The relative levels of transcripts from individual members of the CHS multigene family differed significantly at 1.5 h compared to 22.5 h after elicitation. More strikingly, three PAL genes were expressed in cultivar Imuna in response to fungal elicitor, whereas two are expressed in elicitor-treated cell cultures of cultivar Canadian Wonder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269060
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Differentiation of trophoblast of the baboon blastocyst (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 225 (1989), S. 329-340 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The structure of trophoblast of the baboon blastocyst undergoes a number of maturational changes from the early blastocyst to the late blastocyst stage. The striking expansion of the blastocyst that occurs during the preimplan tation period is accompanied by the development of an extensive endocytic apparatus. Cationized ferritin labels coated depressions and vesicles near the apical cell surface, numerous uncoated tubules and larger apical vesicles, and multivesicular bodies within trophoblast cells. Basally and laterally the labeled components are primarily small uncoated vesicles and tubules. Small, discrete clusters of ferritin particles were seen within the basolateral compartment between trophoblast and its basal lamina and beneath trophoblast cells that do not have a basal lamina. The results indicate that ingested materials may be directed in two pathways, one involving breakdown within the lysosomal system and one involving transcytosis. The zona pellucida is a trilaminar structure consisting of a fibrillar outer layer that often contains spermatozoa, an intermediate zone, and an inner layer containing columns of dense zonal material. Loss of the zona occurs after expansion of the blastocyst and development of the endocytic organelles. During the late blastocyst stage, syncytial trophoblast differentiates at the margin of the polar trophoblast. Because blastocysts were flushed from the uterus, it could not be determined whether azonal blastocysts had been adherent to the uterine surface prior to collection.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092250409
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Trophoblast differentiation during the transition from trophoblastic plate to lacunar stage of implantation in the rhesus monkey and human (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 186 (1989), S. 85-98 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The transition from the tropho-blastic plate stage to the early lacunar stage was examined in a series of implantation sites from the rhesus monkey, timed on the basis of the preovulatory estrogen peak, and prepared for transmission electron microscopy. This transition was compared with specimens from stage 5a, b, and c in the Carnegie collection of human embryos. The transition was marked by the differentiation of a new type of syncytial trophoblast - namely, a unilaminar microvillous polarized syncytium, which developed throughout the trophoblastic plate, forming characteristic intrasyncytial clefts. The rapid development of this type of syncytium created a nonclotting chamber for maternal blood wherever trophoblast intrusion into maternal vessels created confluence. Although the nature of the material in the Carnegie series precluded cytological characterization of the trophoblast, there is evidence that a similar transition occurs in human trophoblast and that in the human also the appearance of lacunae marks a change from an early invasive trophoblast to a situation in which growth is more significant.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001860107
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Developmental capacity of mouse oocytes that undergo maturation in vitro: Effect of the hormonal state of the oocyte donor (1989)
    New York, NY : Wiley-Blackwell
    Gamete Research 24 (1989), S. 81-92 
    Details
    ISSN: 0148-7280
    Keywords: oocyte maturation ; fertilization ; preimplantation development ; gonadotropins ; mouse ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: In a previous study, it was shown that cumulus cell-enclosed germinal vesicle (GV)-stage oocytes, isolated from pregnant mares' serum gonadotropin (PMSG)-primed immature (22-24 day old) mice and that underwent spontaneous maturation in vitro, exhibited frequencies of embryonic development similar to oocytes stimulated to mature and ovulate in vivo by administration of gonadotropins [Schroeder AC, Eppig JJ, (1984) Dev Biol 102:493-497]. In the present study, the effect of the hormonal state of the oocyte donor on the capacity of in vitro matured oocytes to be fertilized and undergo pre- and post-implantation development was explored further. Oocytes were isolated at the GV-stage from the following groups of mice: 1) unprimed immature mice; 2) adult cycling mice; 3) unprimed Snell dwarf (dw) mice that have undetectable levels of growth hormone (GH), prolactin, and thyroid-stimulating hormone (TSH); and 4) primed and unprimed hypogonadal (hpg) mice that have undetectable levels of circulating gonadotropins. Oocytes maturing in vitro after isolation from normal unprimed immature or adult mice at all stages of the estrous cycle acquired full developmental capacity. GV-stage oocytes isolated from dwarf mice showed embryonic development equivalent to normal ( + /?) littermate controls. Therefore, GH, TSH, or prolactin are not required during oogencsis in vivo to promote the acquisition of competence to complete embryogenesis after maturation in vitro. Oocytes from hypogonadal mice had a much reduced capacity for preimplantation development when compared with normal littermates. Administration of PMSG to the hypogonadal mice significantly increased the developmental capacity of oocytes that underwent maturation in vitro. Gonadotropins, therefore, have a beneficial effect on the oocytc's capacity for embryonic development.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120240111
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    Paper (German National Licenses)
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