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  • 1
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    Hormonal regulation of gonadotropin receptors and steroidogenesis in cultured fetal rat tests (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-22
    Description: Gonadotropic activation of the adult rat testis in vitro and in vivo is followed by down-regulation of luteinizing hormone receptors and decreased androgen responses to subsequent hormonal stimulation. In contrast, treatment of cultured fetal testes with gonadotropins and dibutyryl adenosine 3',5'-monophosphate enhanced steroidogenic responsiveness and did not cause the luteinizing hormone-receptor loss and desensitization that is characteristic of the adult gonad. The analysis of gonadotropin receptors and action in cultured fetal testis cells facilitates developmental studies of gonadal function, and has revealed significant differences in the responses of fetal and adult Leydig cells to gonadotropic regulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Warren, D W -- Dufau, M L -- Catt, K J -- 1F33-HD06192/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1982 Oct 22;218(4570):375-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6289438" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bucladesine/pharmacology ; Cell Differentiation/drug effects ; Cells, Cultured ; Chorionic Gonadotropin/pharmacology ; Hydroxyprogesterones/biosynthesis ; Leydig Cells/*drug effects ; Luteinizing Hormone/pharmacology ; Male ; Progesterone/biosynthesis ; Rats ; Receptors, Cell Surface/*drug effects/metabolism ; Receptors, LH ; Testis/*embryology/metabolism ; Testosterone/biosynthesis
    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
    Electronic Resource
    Electronic Resource
    A NICMOS-3 based spectrograph for near infrared astronomy (1994)
    Springer
    Experimental astronomy 3 (1994), S. 189-190 
    Details
    ISSN: 1572-9508
    Keywords: Spectrograph ; Nicmos ; Near IR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe a design for a compact cooled spectrograph which incorporates two cameras and two collimators to achieve high throughput from 0.8 to 2.5μm. The spectrograph utilizes multiple NICMOS 3 arrays, specially mounted to minimize their separation in the spectral dimension. This accommodates the broad wavelength range while providing extensive coverage in the spatial dimension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430161
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Refractive optical systems for astronomical instruments using infrared arrays in the 0.8 to 2.5 micron bands (1994)
    Springer
    Experimental astronomy 3 (1994), S. 145-146 
    Details
    ISSN: 1572-9508
    Keywords: Infrared ; Optical Design ; Lens ; Achromatization ; Camera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As modern infrared arrays evolve towards larger formats and smaller pixel sizes, their use in instruments requires optics of increasingly higher performance. Refractive systems are attractive for many applications because they can accommodate wide fields of view or fast focal ratios while permitting a compact, unobscured layout. We examine design considerations for lenses which can address the entire near-infrared spectral region of 0.8 to 2.5 μm. Achromatization over this broad range is a particular challenge. We discuss a systematic study of candidate materials and combinations of materials having useful chromatic properties, with particular emphasis on alkaline earth halides and metallic oxides. We present an example of a practical design being incorporated into an instrument currently under construction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430140
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    Paper (German National Licenses)
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  • 4
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    {lambda} Int bridges in Holliday {#x0237}unction complexes [Biochemistry] (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-08-27
    Description: The site-specific recombinase encoded by bacteriophage λ [λ Integrase (Int)] is responsible for integrating and excising the viral chromosome into and out of the chromosome of its Escherichia coli host. In contrast to the other well-studied and highly exploited tyrosine recombinase family members, such as Cre and Flp, Int carries...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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