Variable stoichiometry in active ion transport: theoretical analysis of physiological consequences.
نویسندگان
چکیده
منابع مشابه
Variable stoichiometry in active ion transport: theoretical analysis of physiological consequences.
Active ion transport systems with fixed stoichiometry are subject to a thermodynamic limit on the ion concentration gradients that they can generate and maintain, and their net rates of transport must inevitably decrease as this limit is approached. The capability to vary stoichiometry might thus be physiologically advantageous: a shift to lower stoichiometry (fewer ions pumped per reaction cyc...
متن کاملanalysis of power in the network society
اندیشمندان و صاحب نظران علوم اجتماعی بر این باورند که مرحله تازه ای در تاریخ جوامع بشری اغاز شده است. ویژگیهای این جامعه نو را می توان پدیده هایی از جمله اقتصاد اطلاعاتی جهانی ، هندسه متغیر شبکه ای، فرهنگ مجاز واقعی ، توسعه حیرت انگیز فناوری های دیجیتال، خدمات پیوسته و نیز فشردگی زمان و مکان برشمرد. از سوی دیگر قدرت به عنوان موضوع اصلی علم سیاست جایگاه مهمی در روابط انسانی دارد، قدرت و بازتولید...
15 صفحه اولthe stady and analysis of rice agroclimatology in lenjan
the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...
15 صفحه اولActive transport of potassium ion in heart mitochondria.
Several factors affecting K* transport by rabbit heart mitochondria were examined, using a K-sensitive electrode. The histone fractions f2a and j3-7 produced an energy-dependent efflux of K*. Inorganic phosphate was required for optimal activity; Km for phosphate was 60 /AM. Both rate and extent of K + efflux decreased as K concentration in the reaction medium was increased. The direction of va...
متن کاملDopamine modulation of active ion transport in rabbit corneal epithelium.
The addition of micromolar quantities of dopamine stimulated ion transport in the isolated rabbit corneal epithelium. This response was blocked by pretreatment with the dopamine antagonist, haloperidol, and by the elimination of Cl- from the bathing solutions. The beta-adrenergic antagonist, timolol, was also a potent inhibitor of the epithelial response to dopamine. The presence of the seroton...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1985
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.82.16.5352