Avian Hypophyseal Stimulation and Spermatogenesis
نویسندگان
چکیده
منابع مشابه
Neuroectodermal origin of avian hypothalamo-hypophyseal complex: the role of the ventral neural ridge.
Embryonic discs from White Leghorn chick embryos (presomite to 12-omite stages) were examined in serial transverse and longitudinal sections. Later stages, up to 21 days, were also examined. The following observations were made: (1) Lateral folding rather than head folding is the mechanism by which the avian embryo is delimited. The process takes place at two terminal points, one cephalic the o...
متن کاملHypophyseal triplication: case report and embryologic considerations.
SUMMARY Hypophyseal triplication is malformation that has not been described previously. We present a child with midline abnormalities who underwent epignathus excision at birth. Brain MR imaging revealed 2 paired lateral pituitary glands and an oval midline gland, each with an independent stalk, connected to a thickened third ventricle floor. Because malformations represent a failure in embryo...
متن کاملThe Hypophyseal Growth Hormone, Nature and Actions
many formulae and figures. Its many chapter subheadings give the book its rather terse, outline form. A discussion of methods of isolation, characterization, and determination of purity is followed by successive chapters dealing with reaction rates as a function of substrate concentration, inhibitor action, temperature, and pH. Thermodynamic concepts are well developed in chapters on energetics...
متن کاملUltracentrifugation of hypophyseal growth hormone.
Sedimentation velocity was measured in a Spinco ultracentrifuge’ operating at 165,000 X g. The hormone solutions (0.5 per cent) were prepared with borate buffer of pH 9.7 or saline at pH 9.1. Table I presents a typical run in a borate buffer; the sedimentation velocity constant was calculated by the procedure described by Svedberg and Pedersen (3). It may be noted that the individual values of ...
متن کاملSedimentation behavior of hypophyseal growth hormone.
In a previous publication, it was reported that solution of the hypophyseal growth hormone in acetate buffers results in an increment of its intrinsic viscosity with an accompanying increase of molecular weight (1). Later, Smith et al. (2) confirmed these observations in ultracentrifugal studies. The purpose of this present investigation has been to study the sedimentation behavior of the hormo...
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ژورنال
عنوان ژورنال: Australian Journal of Biological Sciences
سال: 1970
ISSN: 0004-9417
DOI: 10.1071/bi9700717