منابع مشابه
Intranucleolar Membranes and Nuclear-cytoplasmic Exchange in Young Crayfish Oocytes
Notwithstanding the fact that the nucleolus was one of the first cellular organelles to be described (see references 11, 22, 30, 31, 38, 42 for reviews), its significance remained largely unexplained until the studies of Caspersson and Schultz (13), Caspersson (14), and Brachet (8, 9). However, recent advances in techniques of ultrastructural cytochemistry (see references 6, 18, 40), radioautog...
متن کاملDependence of potassium ion and sodium ion exchange on light in the crayfish retina.
The exchange (release resp. uptake) of K+, Rb+, and Na+ ions in the isolated retina of the crayfish Astacus leptodactylus with the surrounding medium was measured using flame photometry and radioisotopic techniques. 1. The net release of K+ into a Na+ and K+ free, choline containing medium, as measured by means of flame photometry, is increased by illumination. 2. The release of 86Rb+, used as ...
متن کاملCRUSTACEANS Crayfish: Northern crayfish Orconectes virilis Louisiana crayfish Procambarus clarkii Water nymph crayfish Orconectes nais Rusty crayfish Orconectes rusticus
Crayfish: Northern crayfish Orconectes virilis Louisiana crayfish Procambarus clarkii Water nymph crayfish Orconectes nais Rusty crayfish Orconectes rusticus Utah is inhabited by a single native crayfish known as the Pilose crayfish Pacifastacus (Hobbsastacus) gambelii. Its native range is in northern Utah’s Bear River, Weber River and Ogden River drainages and in the Raft River Mountain’s drai...
متن کاملCurve walking in crayfish
Curve walking of crayfish Astacus leptodactylus was investigated by exploiting their optomotor response. The animal walked while spatially fixed on a motor-driven treadmill and turning behaviour was induced by an optical stimulus, a pattern consisting of vertical stripes moving in a horizontal direction. In this open-loop situation, the crayfish maintains the same step frequency for the legs on...
متن کاملan appropriate model for exchange rate predictability in iran: comparing potential forecastability
nowadays in trade and economic issues, prediction is proposed as the most important branch of science. existence of effective variables, caused various sectors of the economic and business executives to prefer having mechanisms which can be used in their decisions. in recent years, several advances have led to various challenges in the science of forecasting. economical managers in various fi...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Biomembranes
سال: 2002
ISSN: 0005-2736
DOI: 10.1016/s0005-2736(02)00585-0