Prenatal exposure to excess androgens, testosterone in particular, has clear effects on potential ram fertility. Utilizing breeding soundness examinations in male sheep will assess the ram's potential ability to impregnate a certain number of healthy females during a defined breeding season. Identifying rams that have high breeding potential can provide...
RNA silencing plays a critical role in plant defense against viral infection. Plants use virusderived
small interfering RNA to target and silence invading viruses. The antiviral silencing
pathway can be broken down into three conceptual stages: initiation, amplification, and systemic
movement. The molecular mechanisms of silencing initiation are not well...
The ovine sexually dimorphic nucleus (oSDN) is 2 times larger in rams than in ewes. Sexual
differentiation of the oSDN is produced by testosterone exposure during the critical period
occurring between gestational day (GD)60 and GD90 (term, 147 d). We tested the hypothesis
that testosterone acts through the androgen receptor...
Full Text:
, Melissa Scheldrup,
Mary Meaker, Fred Stormshak, and HernánJ. Montilla
Department of Physiology and
The ovine sexually dimorphic nucleus (oSDN) is 2 times larger in rams than in ewes. Sexual
differentiation of the oSDN is produced by testosterone exposure during the critical period
occurring between gestational day (GD)60 and GD90 (term, 147 d). We tested the hypothesis
that testosterone acts through the androgen receptor...
The ovine sexually dimorphic nucleus (oSDN) is 2 times larger in rams than in ewes. Sexual differentiation of the oSDN is produced by testosterone exposure during the critical period occurring between gestational day (GD)60 and GD90 (term, 147 d). We tested the hypothesis that testosterone acts through the androgen receptor...
Penetration has long been recognized as an important factor
in the action of chemicals on plants. The effectiveness of herbicides
on such plants as blackberries is often thought to be limited by the
failure to obtain adequate penetration through the cuticular barrier.
A number of factors, among them relative humidity,...
The purpose of this study is twofold; first, to describe and
analyze the most significant problems encountered by managers of
manufacturing plants in developing countries. American managerial
techniques are taken as basis of comparison. Second, to suggest
approaches and points of view which can be useful to managers and
students...
Eradication is often the preferred method of invasive species management on islands; however, its consequences may affect native communities. Feral goats (Capra hircus), donkeys (Equus asinus), and pigs (Sus scrofa) were eradicated from Santiago Island in the Galapagos Archipelago by 2005. Because feral goats were the dominant herbivores on Santiago...