نتایج جستجو برای: ratio na ca 192
تعداد نتایج: 878023 فیلتر نتایج به سال:
Simultaneous comparisons were made between a freezing-tolerant, cold-acclimating (CA) wild potato species (Solanum commersonii) and a freezing-sensitive, nonacclimating (NA) cultivated species (Solanum tuberosum). Comparative studies allowed differentiation of plasma membrane lipid changes associated with increased freezing tolerance following CA from lipid changes that can result from metaboli...
Determinants of 45Ca influx, 45Ca efflux, and 22Na efflux were examined in dog red blood cells. 45Ca influx is strongly influenced by the Na concentration on either side of the membrane, being stimulated by intracellular Na and inhibited by extracellular Na. A saturation curve is obtained when Ca influx is plotted as a function of medium Ca concentration. The maximum Ca influx is a function of ...
به منظور بررسی اثرات متقابل تنش های شوری و خشکی بر رشد دو رقم سورگوم (اسپیدفید و پگاه) یک آزمایش فاکتوریل در قالب طرح کاملاً تصادفی با سه تکرار در گلخانه گروه خاکشناسی دانشگاه زنجان انجام شد. در این آزمایش فاکتورهای شوری و خشکی هر کدام دارای چهار سطح و فاکتور رقم دارای دو سطح بود. اعمال تیمارهای شوری از طریق آبیاری گلدان های حاوی ارقام مختلف سورگوم با آب شور صورت پذیرفت. سطوح شوری آب آبیاری عبار...
تا کنون مطالعات بسیاری در باره پیش بینی پره اکلامپسی انجام شده و متدهای بسیاری برای screen بیماری وجود دارد که این متدها شامل متدهای قدیمی و رایج مثل roll over test سابقه خانوادگی و پاریتی میباشد. متدهای آزمایشگاهی جدیدی اخیرا مورد بررسی قرار گرفته است که از آن جمله بررسی میزان فیبرونکسین پلاسما و بررسی کلسیم ادراری است که یا از طریق نسبت ca/cr در یک نمونه ادراری و یا بررسی کلسیم ادرار 24 ساعته...
Hypothalamic histaminergic tuberomammillary (TM) neurons express nicotinic acetylcholine receptors (nAChRs) with kinetic and pharmacological properties resembling those of highly Ca(2+) permeable alpha7 nAChRs. However, the Ca(2+) permeability of TM nAChR channels has not been determined. To directly evaluate the Ca(2+) permeability of TM nAChRs, patch-clamp recordings were conducted using non-...
In order to evaluate the effect of seed priming on salinity modification of safflower (cv. Goldasht), a hydroponic experiment was conducted at Research Greenhouse of Vali-e-Asr University of Rafsanjan, Iran, in 2009. Priming treatments at 4 levels (no priming as control, and priming with distilled water, NaCl and Ca(NO3)2 for 24 hours) and salinity treatments at 4 levels (0, 8, 16 and 24...
The molecular mechanism of thrombin activation by Na(+) remains elusive. Its kinetic formulation requires extension of the classical Botts-Morales theory for the action of a modifier on an enzyme to correctly account for the contribution of the E*, E, and E:Na(+) forms. The extended scheme establishes that analysis of k(cat) unequivocally identifies allosteric transduction of Na(+) binding into...
a hydroponic experiment was conducted to evaluate the effects of salt stress on safflower genotypes under greenhouse conditions. the experiment was arranged as a factorial one based upon a completely randomized design with three replications. five safflower genotypes (arak2811, nebraska10, sod25, ca116, and ca128), and four salinity treatments (0, 0.3, 0.5, and 0.7 percent of nacl) were employe...
In a three-year (2004-2006), field experiment, we aimed to study changes in leaf physiological traits (leaf water potential-Ψleaf, leaf water content-LWC, carbon isotope discrimination-Δ, specific leaf area-SLA, chlorophyll content as assessed by SPAD and modified SPAD-MSPAD) and elemental composition (K, Na, Ca, Mg, K/Na, Ca/Mg, total leaf salinity-TLS) of sugar beets (cv. Rizor) grown unde...
There are a wide range of responses of plants to salinity which involve interactions of Na with Ca. Plant processes such as growth, photosynthesis, mineral nutrition, water and ion transport are affected by these Na-Ca interactions. Many of these responses can be linked to the direct Na-Ca interactions at the surface of the plasma membrane and subsequent Ca signaling events. 10.1. General Effec...
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