نتایج جستجو برای: آنزیم na
تعداد نتایج: 278250 فیلتر نتایج به سال:
Influenza neuraminidase (NA) proteins expressed in TK- cells infected with recombinant vaccinia virus carrying NA gene of highly pathogenic avian influenza H5N1 virus or 2009 pandemic H1N1 (H1N1pdm) virus were characterized for their biological properties, i.e., cell localization, molecular weight (MW), glycosylation and sialidase activity. Immune sera collected from BALB/c mice immunized with ...
Voltage-gated Na(+) channels (Na(+) channels) mediate the rising phase of action potentials in neurons and excitable cells. Nine subtypes of the alpha subunit (Na(v)1.1-Na(v)1.9) have been shown to form functional Na(+) channels to date. Recently, anesthetic concentrations of volatile anesthetics and ethanol were reported to inhibit Na(+) channel functions, but it is not known whether all subty...
beta-Agonists cause an inhibition of contractility and a transient stimulation of Na+/K+ pumping in smooth muscle cells of the stomach from the toad Bufo marinus. To determine if the stimulation of Na+/K+ pumping causes changes in intracellular [Na+] ([Na+]i) that might link Na+ pump stimulation to decrease Ca2+ availability for contraction, [Na+]i was measured in these cells with SBFI, a Na(+)...
Background: Polarized cells are key to the process of differentiation. Xenopus oocyte is a polarized cell that has complete blue-print to differentiate 3 germ layers following fertilization, as key determinant molecules (Proteins and RNAs) are asymmetrically localized. The objective of this work was to localize Na+, K+-ATPase activity along animal-vegetal axis of polarized Xenopus oocyte and fo...
Although the phenotypes of many membrane-excitation mutants of Paramecium are best expressed in Na+-containing solutions, little is known about the role of Na+ in membrane excitation in Paramecium. By measuring 22Na fluxes, we have shown that: (a) The total cellular Na+ content is equivalent to a cytoplasmic concentration of 3--4 mM, if the Na+ concentration is uniform throughout the cell. (b) ...
Since phosphonoformic acid (PFA) acts as a specific competitive inhibitor of Na+-Pi co-transport across renal brush-border membrane (BBM), we employed the [14C]PFA as a probe to determine the mechanism of its interaction with rat renal BBM. The binding of [14C]PFA to BBM vesicles (BBMV), with Na+ present in extravesicular medium (Na+o), was time- and temperature-dependent. The replacement of Na...
This study compared measured serum [Na(+)] (S([Na+]); brackets denote concentration) with that predicted by the Nguyen-Kurtz equation after manipulating ingested [Na(+)] and changes in body mass (DeltaBM) during prolonged running in the heat. Athletes (4 men, 4 women; 22-36 yr) ran for 2 h, followed by a run to exhaustion and 1-h recovery. During exercise and recovery, subjects drank a 6% carbo...
In skeletal muscle, excitation may cause loss of K+, increased extracellular K+ ([K+]o), intracellular Na+ ([Na+]i), and depolarization. Since these events interfere with excitability, the processes of excitation can be self-limiting. During work, therefore, the impending loss of excitability has to be counterbalanced by prompt restoration of Na+-K+ gradients. Since this is the major function o...
زمینه و هدف: همگام با پیشرفت های علمی اخیر در زمینه درمان زخم، پانسمان های مدرن با بهره گیری از تکنولوژی و دانش روز طراحی و تولید شدند. چنین پانسمان هایی می توانند با حفظ و کنترل رطوبت زخم در کنار سایر شرایط، محیط مناسب ی را برای درمان مرطوب زخم فراهم نمایند. هدف از این مطالعه تعیین تاثیر دو روش پانسمان خشک و مرطوب بر بهبود زخمهای سوختگی بوده است. روش بررسی : این پژوهش نیمه تجربی و روش نمونه ...
زمینه و هدف: به روش احیای خاکهای آلوده با استفاده از میدان الکتریکی، الکتروکینتیک گفته میشود که بیشتر برای آلاینده زدایی فلزات سنگین، آنیون ها و ترکیبات آلی قطبی از خاک استفاده میشود. در این مطالعه به بررسی بازدهی حذف جیوه از خاک رس (با نسبت وزنی کائولن به ماسه 2 به 1) با اعمال این روش و تعیین شرایط حذف بهینه پرداخته شده است. کائولن به علت جذب شدید آلاینده و شبیه سازی مناسب سایت آلوده، شرایط...
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