منابع مشابه
Gating on the outside
Connexin protein can form single-membrane spanning channels (called hemichannels or connexons) that can dock with each other to span two closely apposed plasma membranes and thereby create gap junction channels. What keeps unapposed connexin hemichannels closed, and how do they open when part of junctional channels? The report from Tang et al. (2009) in this issue (see p. 555), along with a rec...
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قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
15 صفحه اولon the effects of pictorial clues on the efl learners listening comprehension development
the following null hypothesis was proposed: there is no significant difference between the efl students listening comprehension development receiving pictorial cues and those receiving no cuse. to test the null hypothesis, 52 male and femal freshmen students of medicine studing at iran university of medical scinces were randomly selected from a total population of 72 students. to ensure that th...
15 صفحه اولOn the outside Looking in
North, discusses and illustrates stress and frustration among rural adolescents. The article is based on tapes of classroom discussion and written work produced while the author was a teacher. We live in the fourth most densely populated country in the world. For the most part we are town dwellers, thinking urban thoughts, experiencing urban feelings, constructing urban plans for the future. We...
متن کاملK+ channel gating: C-type inactivation is enhanced by calcium or lanthanum outside
Many voltage-gated K(+) channels exhibit C-type inactivation. This typically slow process has been hypothesized to result from dilation of the outer-most ring of the carbonyls in the selectivity filter, destroying this ring's ability to bind K(+) with high affinity. We report here strong enhancement of C-type inactivation upon extracellular addition of 10-40 mM Ca(2+) or 5-50 µM La(3+). These m...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 2009
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.200910256