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  • 2000-2004  (2)
  • 1950-1954  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Progestin Receptor Immunoreactivity Within Steroid-Responsive Vasopressin-Immunoreactive Cells in the Male and Female Rat Brain (2002)
    Oxford, UK : Blackwell Science, Ltd
    Journal of neuroendocrinology 14 (2002), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Progestin receptor immunoreactivity is found in the same regions of the bed nucleus of stria terminalis (BST) and centromedial amygdala (CMA) as steroid-responsive vasopressin immunoreactive (AVP-ir) cells. To test whether AVP-ir cells express progestin receptors, brains of male rats were stained immunocytochemically for arginine vasopressin as well as progestin receptors. In BST and CMA, over 95% of AVP-ir cells contained progestin receptor immunoreactivity. In contrast, none of the AVP-ir cells in the suprachiasmatic, supraoptic and paraventricular nuclei expressed progestin receptor immunoreactivity. To study whether progestin receptor expression in AVP-ir cells in the BST and CMA is responsive to gonadal steroids, male and female rats were castrated and implanted with either empty capsules or capsules filled with testosterone or oestradiol, respectively. Ten days later, brains were processed for AVP and progestin receptor immunoreactivity. Although there was no effect of hormonal status on the percentage of colocalized cells, the level of progestin receptor immunoreactivity was higher in rats that received gonadal steroids than those that did not. The presence of progestin receptor immunoreactivity in steroid responsive AVP-ir cells, and the responsiveness of this expression to gonadal hormones, is consistent with the possibility that the effects of gonadal steroids on AVP-ir expression in the BST and CMA may be mediated at least in part by progestin receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2826.2002.00809.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of Sex Differences in Progesterone Receptor Expression in the Medial Preoptic Nucleus of Postnatal Rats (2002)
    Oxford, UK : Blackwell Science, Ltd
    Journal of neuroendocrinology 14 (2002), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The medial preoptic nucleus (MPN) of the rat, an excellent model for understanding the mechanisms involved in sexual differentiation, is highly sensitive to gonadal hormones during both pre- and post-natal life. Progesterone receptor (PR) expression is sexually dimorphic in the prenatal MPN. Males have significantly higher levels of PR-immunoreactivity (PRir) than females from approximately embryonic day 19 through at least the day of birth, suggesting that PR may play a role in sexual differentiation. Because the MPN is still sensitive to steroid hormones postnatally, the present study investigated PR expression in the MPN of males and females after birth using immunocytochemistry. Results indicate that a sex difference in PR expression persists until at least postnatal day (P) 28. However, females begin to express PR around P10. Because oestradiol regulates PR expression in the adult brain, this study also examined the influence of gonadal hormones on PR expression in the neonatal male and female MPN. Castration on the day of birth significantly reduced levels of PRir in the MPN by 24 h following surgery. Ovariectomy on P4, before the onset of ovarian steroidogenesis, prevented the induction of PR expression in the female MPN, observed in controls by P13. In both sexes, the presence of PRir in the MPN is dependent on gonadal hormone exposure. These findings suggest that differences in steroid secretion by the neonatal male and female gonads are responsible for producing sex differences in the level of PR expression in the postnatal MPN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2826.2002.00827.x
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    Paper (German National Licenses)
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  • 3
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    Unknown
    Isocrates' Reaction to the "Phaedrus" (1953)
    Leiden, etc. : Periodicals Archive Online (PAO)
    Mnemosyne. ser.4:6:1 (1953) 39 
    Details
    ISSN: 0026-7074
    Topics: Classical Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4137-1953-006-01-000002
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    Paper (German National Licenses)
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  • 4
    facet.materialart.
    Unknown
    Plato "Crat." 416 b iterum (1953)
    Leiden, etc. : Periodicals Archive Online (PAO)
    Mnemosyne. ser.4:6:4 (1953) 317 
    Details
    ISSN: 0026-7074
    Topics: Classical Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4137-1953-006-04-000009
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Conductometric Detection of Ions in Paper Chromatograms (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 735-736 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The alkali metal ions being among the most difficult ones to detect in paper chromatograms, I tried a conductometric method for their detection. The chromatograms were prepared with aqueous solutions of the chlorides and of the perchlorates of lithium, sodium and potassium, the ascending mobile ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173735a0
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    Paper (German National Licenses)
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