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排序方式: 共有268条查询结果,搜索用时 0 毫秒
261.
Jared Tur Sachin L. Badole Feng Cheng Aparoop Das Rakesh C. Kukreja Srinivas M. Tipparaju 《Molecular and cellular biochemistry》2017,436(1-2):71-78
We previously demonstrated the role of Kvβ1.1 subunit of voltage-activated potassium channel in heart for its sensory roles in detecting changes in NADH/NAD and modulation of ion channel. However, the pharmacological role for the association of Kvβ1 via its binding to ligands such as cortisone and its analogs remains unknown. Therefore, we investigated the significance of Kvβ1.1 binding to cortisone analogs and AR inhibitor epalrestat. In addition, the aldose reductase (AR) inhibitor epalrestat was identified as a pharmacological target and modulator of cardiac activity via binding to the Kvβ1 subunit. Using a combination of ex vivo cardiac electrophysiology and in silico binding, we identified that Kvβ1 subunit binds and interacts with epalrestat. To identify the specificity of the action potential changes, we studied the sensitivity of the action potential prolongation by probing the electrical changes in the presence of 4-aminopyridine and evaluated the specificity of pharmacological effects in the hearts from Kvβ1.1 knock out mouse. Our results show that pharmacological modulation of cardiac electrical activity by cortisone analogs and epalrestat is mediated by Kvβ1.1. 相似文献
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Lokesh Bhattacharyya C.Fred Brewer Rodney D. Brown Seymour H. Koenig 《Biochemical and biophysical research communications》1984,124(3):857-862
Ca2+-Zn2+-derivatives of lentil and pea lectins were prepared for the first time by a unique method involving dialysis of the native Ca2+-Mn2+-lectins against large excesses of metal ions in pH 4.0 buffer. Each derivative contained about 1.5 g atoms of Ca2+ and about 1 g atom of Zn2+ per monomer. The derivatives were found to be identical to their respective native forms, both in molecular weight and carbohydrate binding activities. Solvent proton relaxation dispersion measurements were used to characterize both the Ca2+-Zn2+- and Ca2+-Mn2+-complexes of the lentil lectin. 相似文献
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E C Abramson S C Kukreja T E Lad W P Shemerdiak P A York 《Hormones et métabolisme》1984,16(4):204-207
We evaluated nephrogenous cyclic adenosine monophosphate ( NcAMP ) levels in 61 normocalcemic patients with documented cancer of various organs and cell types. NcAMP levels were elevated in 17 (28%) and decreased in 13 (21%) of the cancer patients. Both high and low NcAMP levels were seen within the various cancer groups. There was a significant correlation (r = 0.383, P less than 0.01) between NcAMP and serum parathyroid hormone (PTH) levels, suggesting that tumor-related factors affecting NcAMP , may be partially related to native PTH. Alternatively, these factors might be altering the effect of endogenous PTH on renal tubules. A significant negative correlation was also observed between NcAMP and tubular maximum for phosphate (r = -0.356, P less than 0.02) suggesting that either cAMP per se or factors affecting NcAMP alter phosphate excretion. Follow up serum calcium data was available on 48 of the 61 patients. Subsequent hypercalcemia developed independent of the initial nephrogenous cAMP levels. It therefore appears that NcAMP elevation and development of hypercalcemia are two separate paraneoplastic phenomena. 相似文献
267.
Quinn Li Lokesh Gakhar M. Ashley Spies 《Biochimica et Biophysica Acta (BBA)/General Subjects》2018,1862(9):1902-1912
Glucokinase (GK) is an enzyme that catalyzes the ATP-dependent phosphorylation of glucose to form glucose-6-phosphate, and it is a tightly regulated checkpoint in glucose homeostasis. GK is known to undergo substantial conformational changes upon glucose binding. The monomeric enzyme possesses a highly exotic kinetic activity profile with an unusual sigmoidal dependence on glucose concentration. In this interdisciplinary study, which draws on small angle X-ray scattering (SAXS) integrated with 250?ns of atomistic molecular dynamics (MD) simulations and experimental glucose binding thermodynamics, we reveal that the critical regulation of this glucose sensor is due to a solvent controlled “switch”. We demonstrate that the “solvent switch” is driven by specific protein structural dynamics, which leads to an enzyme structure that has a much more favorable solvation energy than most of the protein ensemble. These findings uncover the physical workings of an agile and flexible protein scaffold, which derives its long-range allosteric control through specific regions with favorable solvation energy. The physiological framework presented herein provides insights that have direct implications for the design of small molecule GK activators as anti-diabetes therapeutics as well as for understanding how proteins can be designed to have built-in regulatory functions via solvation energy dynamics. 相似文献
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