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Results 701 - 716 of 716
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Goswami A - - 1968
RNA from testes of hypophysectomized rats treated with follicle-stimulating hormone and luteinizing hormone markedly stimulates in vitro the incorporation of acetate and malonate (as CoA derivatives) into polyunsaturated fatty acids. The system in vitro contains the components necessary for both protein and fatty acid synthesis. That the RNA is a ...
Fox S W - - 1968
Thermal polymers of arginine, glutamic acid, glycine, histidine, phenylalanine, and tryptophan have melanocyte-stimulating activity. The fact that similar polymers lack such activity indicates that the effect is related to the specific amino acid residues. The active polymers are discussed as a model of an evolutionary precursor of contemporary melanocyte-stimulating hormone.
Lewis L N - - 1968
Debladed midribs of citrus leaves showed the typical delay of abscission in response to indoleacetic acid (IAA), and the typical acceleration of abscission in response to gibberellic acid (GA). Interaction experiments with these 2 hormones indicated that the balance of the 2 hormones may be more important in regulating abscission ...
Teng C S - - 1967
1. The hormonal regulation of cytoplasmic protein synthesis in the uterus is described. Polyribosomal preparation from uteri of normal or ovariectomized rats was isolated by procedure 3 and assayed for [(14)C]leucine-incorporation activity in the cell-free system, as described by Teng & Hamilton (1967). 2. Ovariectomy of normal animals caused, 3 ...
Copp D H - - 1967
Acid extracts of thyroid glands from a small shark Squalus suckleyi and domestic fowl Gallus domestica contained no detectable calcitonin activity, while very potent hypocalcemic responses were obtained in rats with similar extracts from the ultimobranchial glands of these two species. The calcitonin concentration was 4 to 40 times that ...
Goswami A - - 1967
1. The influence of pituitary gonadotrophins and of testosterone on the conversion of linoleic acid into other polyunsaturated fatty acids by rat testicular tissue was studied. 2. In immature hypophysectomized rats, follicle-stimulating hormone caused a threefold increase in the incorporation of radioactivity from [1-(14)C]linoleic acid into testicular lipids; the distribution ...
Oikawa A - - 1967
Purified bovine growth hormone was acetylated with acetic anhydride under various conditions. Acetylated bovine growth hormone prepared in anhydrous acetic anhydride at 43 degrees for 5min. inhibited the growth-promoting response of unmodified bovine growth hormone in hypophysectomized rats. This acetylated bovine growth hormone contained 18 total acetyl groups/mol., which included ...
Paleg L G - - 1967
To determine the fate of gibberellic acid (GA(3)), solutions were incubated for 24 hours with or without barley endosperm and were subsequently applied to dwarf maize seedlings. Hormone activity appeared to increase as a result of incubation with endosperm. This apparent increase in GA(3) concentration was probably due to a ...
Lockett M F - - 1966
1. Both starch gel and disk electrophoresis demonstrated stepwise degradation of acidic preparations of human and bovine growth hormones and of ovine and bovine lactogenic hormones in solution at pH 9.0-10.0. This developed in 1-3 weeks in refrigerated solutions and in 5-16 hr on incubation at 37 degrees C. Increasing ...
Shen-Miller J - - 1966
The effect of phototropic stimulation of Zea coleoptile tips on the distribution of both endogenous indoleacetic acid (IAA) and applied C(14)-labeled IAA was determined. The tips rested on bisected agar blocks. More IAA was found in the blocks under the shaded side of the coleoptile tips than those under the ...
VANDERLAAN W P - - 1964
Human growth hormone was prepared from acetone-dried pituitary powder by hot glacial acetic acid extraction and subsequent precipitation by sodium chloride and cold acetone. The yield was 13 per cent and the preparation was called practical growth hormone in recognition of its complement of corticotropin. Treatment of two dwarfs with ...
PITTMAN J A - - 1963
Oxidation of D-glucose-C(14) by bovine thyroid slices was stimulated by cysteine, 2-aminoethanethiol, and cystamine. Amino acids tested, other than cysteine, were not stimulatory, except tyrosine and arginine to a slight degree. The pattern of stimulation resembled that brought about by thyroid-stimulating hormone. Stimulation of labeled CO(2) production was greater when ...
FAND S B - - 1962
The spectral light absorption of the in vitro periodic acid-Schiff reactions of 4 purified pituitary hormones is described. The absorption spectra present a maximum between 560 and 565 mmicro. The color developed conforms with Beer's law for the ranges of concentration examined. The different hormones exhibit different chromogenicity per unit ...
DIXON J S - - 1962
The amino acid content in human hypophyseal growth hormone has been determined by chromatography on resin columns. On the basis of 29,000 for the molecular weight, the empirical formula of the hormone was obtained: lys(13)his(5)arg(14)asp(27) thr(14)ser(23)glu(34)pro(12)gly(13)ala(12)-(1/2 cys)(6)val(12)met(4)-ileu(10)leu(31)tyr(10)phe(15)try(1)(NH(3))(32).
CLUTTER M E - - 1960
The direct addition of indole-3-acetic acid into sterile-cultured stem pith sections of Nicotiana tabacum through inserted glass pipettes has induced cell division and differentiation where such activity would not normally occur. This evidence lends support to the theory that indole-3-acetic acid is the hormone that limits xylogenesis.
KOSTYO J L - - 1959
The influence of the pituitary on the transport of alpha-aminoisobutyric acid-1-C(14) into the cells of isolated rat diaphragm was investigated. Hypophysectomy results in a lower-than-normal rate of alpha-aminoisobutyric acid-1-C(14) penetration into muscle. Adding either simian or bovine growth hormone preparations to the incubation medium in concentrations of 2.5 to 25 ...
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