L
Laurence W. Crim
Researcher at Memorial University of Newfoundland
Publications - 28
Citations - 1637
Laurence W. Crim is an academic researcher from Memorial University of Newfoundland. The author has contributed to research in topics: Gonadotropin & Pituitary gland. The author has an hindex of 20, co-authored 28 publications receiving 1611 citations.
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Journal ArticleDOI
Onset of gonadotropic hormone accumulation in the immature trout pituitary gland in response to estrogen or aromatizable androgen steroid hormones.
TL;DR: A central effect of steroid hormones on pituitary GtH was confirmed by the fact that pituitaries implants did not increase liver weight as observed after perivisceral hormone treatment, and the possible participation of sex steroids in a mechanism of initiation of gonad recrudescence or onset of pubertal gonadal development in salmonids is discussed.
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Plasma 17α,20β-dihydroxy-4-pregnen-3-one levels during sexual maturation of amago salmon (Oncorhynchus rhodurus): Correlation with plasma gonadotropin and in vitro production by ovarian follicles
TL;DR: It is indicated that 17 alpha, 20 beta-diOHprog is the major steroid responsible for oocyte maturation in amago salmon, produced as the follicular mediator of gonadotropin.
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Motility of fresh and aged halibut sperm
TL;DR: Observations indicated that fast forward-moving sperm motility, which lasts 60-70 s, is correlated with propagating waves on the full length of the sperm flagellum with an initial beat frequency of 45-50 Hz which abruptly drops to about 10 Hz after 60-80 S.
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Stimulation of pituitary gonadotropin by testosterone in juvenile rainbow trout (Salmo gairdneri).
Laurence W. Crim,D.M. Evans +1 more
TL;DR: The role of the gonad with respect to the sexual development of the immature pituitary gland is discussed in this article, where the authors show that intra-itoneal administration of testosterone promotes the appearance of gonadotropin in juvenile male and female rainbow trout.
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The plasma gonadotropin profile during sexual maturation in a variety of salmonid fishes
TL;DR: Sexual maturity of males and females was related to significant increases in plasma gonadotropin with the highest values observed for females near the time of ovulation.