نتایج جستجو برای: surge plan

تعداد نتایج: 113601  

2003
N. M. Czekala E. A. MacDonald K. Steinman S. Walker N. W. Garrigues D. Olson

Pituitary and corpus luteum hormone patterns throughout the elephant estrous cycle have been well characterized. By contrast, analysis of follicular maturation by measurement of circulating estrogens has been uninformative. This study tested the ability of a urinary estradiol-3-glucuronide radioimmunoassay to noninvasively assess follicular development during the nonluteal phase of the elephant...

Journal: :Journal of neuroendocrinology 1998
C L Medina S Nagatani T A Darling D C Bucholtz H Tsukamura K Maeda D L Foster

To determine if glucose availability modulates the timing of the positive feedback action of oestrogen on gonadotropin secretion, we monitored the estradiol-induced luteinizing hormone (LH) surge in sheep (n = 5/group) made transiently hypoglycemic by insulin. Experiment 1 determined an effective insulin treatment, one which would depress tonic LH secretion. Two injections of insulin (5 IU/kg i...

Journal: :Biology of reproduction 2009
Elizabeth R Wagenmaker Kellie M Breen Amy E Oakley Bree N Pierce Alan J Tilbrook Anne I Turner Fred J Karsch

Two experiments were conducted to test the hypothesis that cortisol interferes with the positive feedback action of estradiol that induces the luteinizing hormone (LH) surge. Ovariectomized sheep were treated sequentially with progesterone and estradiol to create artificial estrous cycles. Cortisol or vehicle (saline) was infused from 2 h before the estradiol stimulus through the time of the an...

2008
Arthur T. DeGaetano

The characteristics of seasons with enhanced East Coast winter storm and storm surge activity are identified from among a set of global atmospheric circulation indices and local land and sea surface temperature anomalies. Without regard for storm strength or surge potential, the most active East Coast winter storm (ECWS) seasons occur in association with El Niño events. There is also some indic...

Journal: :European journal of endocrinology 1999
B Hirsch I Knoke S Leonhardt L Pitzel H Jarry W Wuttke

Since structural luteolysis involves deterioration of tissue, the gene expression of matrix-metalloproteinase-1 (MMP-1) and the respective tissue inhibitor of this metalloprotease (TIMP-1) were measured at various times on the day of pro-oestrus and in animals in which the preovulatory prolactin surge was blocked for the duration of 3 cycles by bromocriptine. An additional group of prolactin-bl...

Journal: :Reproduction, fertility, and development 2009
Chatchote Thitaram Pornsawan Pongsopawijit Saran Chansitthiwet Janine L Brown Kannikar Nimtragul Khajhonpat Boonprasert Pongpon Homkong Sittidet Mahasawangkul Suvichai Rojanasthien Ben Colenbrander Gysbert C van der Weijden Frank J C M van Eerdenburg

A unique feature of the reproductive physiology of Asian elephants (Elephas maximus) is the occurrence of two LH surges before ovulation, instead of one. An anovulatory LH (anLH) surge, the function of which is unknown, occurs consistently 3 weeks before the ovulatory LH (ovLH) surge that induces ovulation. Thus, the ability to induce an ovLH surge would be useful for scheduling natural mating ...

2013
Ute C. HERZFELD Brian McDONALD Maciej STACHURA Robert GRIFFIN HALE Phillip CHEN Thomas TRANTOW

The Bering Glacier–Bagley Icefield system in Alaska is currently surging (2011). Large-scale elevation changes and small-scale elevation-change characteristics are investigated to understand surge progression, especially mass transport from the pre-surge reservoir area to the receiving area and propagation of the kinematic surge wave as manifested in heavy crevassing characteristic of rapid, br...

2002
R. C. Turner R. A. Burrows

An experimental investigation of the effects of stage matching on compressor surge-by-This paper summarises some exploratory tests on o low speed low pressure ratio multi-stage a;:ial compressor, in rJhich mism2Ltchi.q w&s simulated by appropriate staggering of the stages, the last ztrgo alone being unchanged. Overall and stage characteristics anil surge flow coefficients were determined for tw...

Journal: :Endocrinology 2005
K K Soma K Sinchak A Lakhter B A Schlinger P E Micevych

A central event in mammalian reproduction is the LH surge that induces ovulation and corpus luteum formation. Typically, the LH surge is initiated in ovariectomized rats by sequential treatment with estrogen and progesterone (PROG). The traditional explanation for this paradigm is that estrogen induces PROG receptors (PR) that are activated by exogenous PROG. Recent evidence suggests that where...

Journal: :Endocrinology 2015
Vasantha Padmanabhan Almudena Veiga-Lopez Carol Herkimer Bachir Abi Salloum Jacob Moeller Evan Beckett Rohit Sreedharan

Prenatal T excess induces maternal hyperinsulinemia, early puberty, and reproductive/metabolic defects in the female similar to those seen in women with polycystic ovary syndrome. This study addressed the organizational/activational role of androgens and insulin in programming pubertal advancement and periovulatory LH surge defects. Treatment groups included the following: 1) control; 2) prenat...

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