Zobrazeno 1 - 10
of 28
pro vyhledávání: '"James P. Preslock"'
Autor:
James P. Preslock
Publikováno v:
Endocrine Reviews. 5:282-308
Introduction THE PINEAL gland has received increasing interest from investigators during the past decade. As the pineal has become more intensively investigated, its involvement in the modulation of specific endocrine systems, in particular the gonad
Autor:
James P. Preslock
Publikováno v:
Life Sciences. 17:1227-1232
The activities of the melatonin-synthesizing enzymes were determined in pineals of Coturnix quail in response to photoperiodicity and gonadal hormones. Both hydroxyindole-O-methyl transferase (HIOMT) and N-acetyl transferase (NAT) were two-fold highe
Autor:
James P. Preslock
Publikováno v:
Hormone Research. 7:108-117
The photoperiodic and hormonal regulation of melatonin-synthesizing enzymes was determined in pineals of Coturnix quail. N-Acetyl transferase (NAT) and hydroxyindole-O-methyl transferase (HIOMT) were twofold higher in pineals of female and male Cotur
Autor:
James P. Preslock, Samuel M. McCann
Publikováno v:
Biology of Reproduction. 33:1120-1125
The purpose of these experiments was to determine whether bilateral vasoligation of adult male rats had any short-term effects upon plasma levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), and prolactin. Adult male rats (250-300
Autor:
James P. Preslock, Emil Steinberger
Publikováno v:
Steroids. 28:775-784
These studies were undertaken to determine the principal pathway of androgen biosynthesis by the testis of the marmoset Saguinus oedipus. Testicular fragments (25 mg) were incubated at 37 degrees C in Krebs-Ringer bicarbonate buffer, pH 7.4, containi
Autor:
James P. Preslock
Publikováno v:
Life Sciences. 15:1805-1813
The enzymic activities of hydroxyindole-o-methyl transferase (HIOMT) and N-acetyl transferase (NAT) were determined in pineals of female and male Coturnix during sexual maturation. Optimum assay conditions for HIOMT was incubation of 5 μl of homogen
Autor:
James P. Preslock, Emil Steinberger
Publikováno v:
General and Comparative Endocrinology. 33:547-553
The following studies were undertaken to compare testicular steroidogenesis in the mature and immature baboon. Testicular fragments (50 mg) were incubated for 3 hr with [7- 3 H]pregnenolone, or with [7- 3 H]progesterone. The mature testis formed more
Publikováno v:
Journal of Andrology. 2:217-221
Sertoli cells isolated from immature, adult, and adult optic-enucleated hamsters respond to FSH, but not to LH, with an increase in cAMP accumulation. There is an age-related decline in responsiveness of Sertoli cells to FSH. Sertoli cells cultured f
Publikováno v:
Biology of Reproduction. 31:436-445
The adult male golden hamster will undergo testicular regression when exposed to a short photoperiod, blinding, or late afternoon injections of melatonin. The present study was conducted to compare the effects of all three treatments on serum gonadot
Autor:
Howard J. Brinkley, James P. Preslock
Publikováno v:
Life Sciences. 9:1369-1380