全文获取类型
收费全文 | 970篇 |
免费 | 41篇 |
国内免费 | 1篇 |
出版年
2021年 | 5篇 |
2019年 | 5篇 |
2018年 | 10篇 |
2017年 | 5篇 |
2016年 | 14篇 |
2015年 | 14篇 |
2014年 | 27篇 |
2013年 | 60篇 |
2012年 | 46篇 |
2011年 | 49篇 |
2010年 | 25篇 |
2009年 | 29篇 |
2008年 | 57篇 |
2007年 | 46篇 |
2006年 | 57篇 |
2005年 | 46篇 |
2004年 | 44篇 |
2003年 | 44篇 |
2002年 | 45篇 |
2001年 | 22篇 |
2000年 | 16篇 |
1999年 | 22篇 |
1998年 | 18篇 |
1997年 | 21篇 |
1996年 | 14篇 |
1995年 | 9篇 |
1994年 | 16篇 |
1993年 | 8篇 |
1992年 | 21篇 |
1991年 | 22篇 |
1990年 | 18篇 |
1989年 | 18篇 |
1988年 | 13篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 18篇 |
1984年 | 14篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1977年 | 8篇 |
1976年 | 6篇 |
1974年 | 4篇 |
1973年 | 6篇 |
1972年 | 3篇 |
1970年 | 6篇 |
1969年 | 4篇 |
1968年 | 5篇 |
排序方式: 共有1012条查询结果,搜索用时 15 毫秒
51.
Tetsuya Yamamoto Yuji Moriwaki Sumio Takahashi Zennta Tsutsumi Jun-ichi Yamakita Yumiko Nasako Keisai Hiroishi Kazuya Higashino 《Journal of chromatography. B, Analytical technologies in the biomedical and life sciences》1996,681(2):395
An assay for human plasma xanthine oxidase activity was developed with pterin as the substrate and the separation of product (isoxanthopterin) by high-performance liquid chromatography with a fluorescence detector. The reaction mixture consists of 60 μl of plasma and 240 μl of 0.2 M Tris-HCl buffer (pH 9.0) containing 113 μM pterin. With this assay, the activity of plasma xanthine oxidase could be easily determined despite its low activity. As a result, it could be demonstrated that the intravenous administration of heparin or the oral administration of ethanol did not increase plasma xanthine oxidase activity in normal subjects, and also that plasma xanthine oxidase activity was higher in patients with hepatitis C virus infection than in healthy subjects or patients with gout. In addition, a single patient with von Gierke's disease showed a marked increase in the plasma activity of this enzyme, relative to that apparent in normal subjects. 相似文献
52.
Wakimoto T Maruyama A Matsunaga S Fusetani N Shinoda K Murphy PT 《Bioorganic & medicinal chemistry letters》1999,9(5):727-730
Alpha1,3-fucosyltransferase (Fuc TVII) is a key enzyme in the biosynthesis of selectin ligands. We have isolated two inhibitors of Fuc TVII from a marine sponge Sarcotragus sp. They were characterized as octa- and nonaprenylhydroquinone sulfates on the basis of spectral data. These compounds inhibited Fuc-TVII with IC50 values of 3.9 and 2.4 microg/mL, respectively. 相似文献
53.
Fujino K Yanase E Shinoda Y Nakatsuka S 《Bioscience, biotechnology, and biochemistry》2004,68(3):764-766
The reactivity of N-tosylindole (4) in the presence of aluminum chloride was studied, and two types of oligomerization of 4 were observed. One type was condensation between both pyrrole parts (dimers 5 and 6 and trimer 7) and the other was between a pyrrole part and a benzene part of each indole nucleus (dimers 8 and 9). 相似文献
54.
Ishijima S Ito H Yoshimura H Uchibori A Ohnishi M 《Bioscience, biotechnology, and biochemistry》2004,68(11):2411-2414
Our earlier studies indicate that stromal alkalinization is essential for light-induced increase in free Mg(2+) concentration ([Mg(2+)]) in chloroplast. Stromal [Mg(2+)] was increased by dark incubation of chloroplasts in the K(+)-gluconate medium (pH 8.0), or by NH(4)Cl. These results indicate that stromal alkalinization can induce an increase in stromal [Mg(2+)] without illumination. Some inhibitors of envelope proton-translocating ATPase activity involved in H(+) efflux inhibited the alkalinization-induced increase in [Mg(2+)]. 相似文献
55.
Hisako?Miki-HirosigeEmail author Yuko?Yamanaka Sumio?Nakamura Shigeaki?Kurata Hisashi?Hirano 《Sexual plant reproduction》2004,16(5):209-214
Pollen proteins of Lilium longiflorum were examined at different developmental stages (young, mature and cultured) using two-dimensional differential gel electrophoresis. Quantitative changes of six proteins (MP1–MP6) during pollen development were observed in the acidic and low molecular weight region. After water absorption on the culture medium, the quantities of all six proteins were drastically changed. Mass spectrometric analysis revealed that MP2, MP3, MP4 and MP6 are late embryogenesis abundant (LEA) (D-7) protein, profilin 3, profilin 1 and enolase, respectively. The remaining two proteins (MP1 and MP5) could not be identified by mass spectrometric analysis. Immunogold electron microscopic examination showed the presence of these proteins in different regions: MP1 around lipid bodies, suggesting possible involvement in lipid metabolism, MP4 near actin in the cytoplasm, indicating the possibility of its interaction with actin in the regulatory pathways of pollen, and MP2 and MP6 in the cytoplasm. 相似文献
56.
57.
58.
Deguchi Y Miyakawa Y Sakurada S Naito Y Morimoto K Ohtsuki S Hosoya K Terasaki T 《Journal of neurochemistry》2003,84(5):1154-1161
The purpose of this study was to clarify the mechanism of the blood-brain barrier (BBB) transport of H-Tyr-D-Arg-Phe-beta-Ala-OH (TAPA), which is a novel dermorphin analog with high affinity for the micro 1-opioid receptor. The in vivo BBB permeation influx rate of [125I]TAPA after an i.v. bolus injection (7.3 pmol/g body weight) into mice was estimated to be 0.265 +/- 0.025 microL/(min.g of brain). The influx rate of [125I]TAPA was reduced 70% by the coadministration of unlabeled TAPA (33 nmol/g of brain), suggesting the existence of a specific transport system for TAPA at the BBB. In order to elucidate the BBB transport mechanism of TAPA, a conditionally immortalized mouse brain capillary endothelial cell line (TM-BBB4) was used as an in vitro model of the BBB. The acid-resistant binding of [125I]TAPA, which represents the internalization of the peptide into cells, was temperature- and concentration-dependent with a half-saturation constant of 10.0 +/- 1.7 microm. The acid-resistant binding of TAPA was significantly inhibited by 2,4-dinitrophenol, dansylcadaverine (an endocytosis inhibitor) and poly-l-lysine and protamine (polycations). These results suggest that TAPA is transported through the BBB by adsorptive-mediated endocytosis, which is triggered by binding of the peptide to negatively charged sites on the surface of brain capillary endothelial cells. Blood-brain barrier transport via adsorptive-mediated endocytosis plays a key role in the expression of the potent opioid activity of TAPA in the CNS. 相似文献
59.
Shinoda S Schindler CK Quan-Lan J Saugstad JA Taki W Simon RP Henshall DC 《Journal of neurochemistry》2003,86(2):460-469
Seizure-induced neuronal death may involve coordinated intracellular trafficking and protein-protein interactions of members of the Bcl-2 family. The 14-3-3 proteins are known to sequester certain pro-apoptotic members of this family. BH3-interacting domain death agonist (Bid) may contribute to seizure-induced neuronal death, although regulation by 14-3-3 has not been reported. In this study we examined whether 14-3-3 proteins interact with Bid during seizure-induced neuronal death. Brief seizures were evoked in rats by intraamygdala microinjection of kainic acid to elicit unilateral hippocampal CA3 neuronal death. Coimmunoprecipitation analysis demonstrated that although Bcl-2-associated death promoter (Bad) constitutively bound 14-3-3, there was no interaction between Bid and 14-3-3 in control brain. Seizures triggered Bid cleavage and a commensurate increase in binding of Bid to 14-3-3 within injured hippocampus. Casein kinases I and II, which can inactivate Bid by phosphoserine/threonine modification, did not coimmunoprecipitate with Bid. The largely uninjured contralateral hippocampus did not exhibit Bid cleavage or binding of 14-3-3 to Bid. In vitro experiments confirmed that 14-3-3beta is capable of binding truncated Bid, likely in the absence of phosphoserine/threonine modification. These data suggest 14-3-3 proteins may target active as well as inactive conformations of pro-apoptotic Bcl-2 death agonists, highlighting novel targets for intervention in seizure-induced neuronal death. 相似文献
60.
Expression of death-associated protein kinase and recruitment to the tumor necrosis factor signaling pathway following brief seizures 总被引:5,自引:0,他引:5
Henshall DC Araki T Schindler CK Shinoda S Lan JQ Simon RP 《Journal of neurochemistry》2003,86(5):1260-1270
Death-associated protein (DAP) kinase is calcium-regulated and known to function downstream of death receptors, prompting us to examine its role in the mechanism of seizure-induced neuronal death. Brief seizures were focally evoked in rats, eliciting neuronal death within the CA3 subfield of the hippocampus, and to a lesser extent, cortex. Western blotting confirmed expression of DAP kinase within hippocampus and cortex at the predicted weight of approximately 160 kDa. Immunohistochemistry revealed seizures triggered a significant increase in numbers of DAP kinase-expressing cells within CA3 and cortex, without affecting cell counts within seizure-resistant CA2 or the dentate gyrus. Numbers of DAP kinase-expressing cells were increased in relation to specific patterns of injury-causing seizure activity, electrographically defined. Seizures caused an early increase in DAP kinase binding to actin, and association with calmodulin. Co-immunoprecipitation studies also revealed seizures triggered binding of DAP kinase to the tumor necrosis factor receptor 1 and the Fas-associated death domain protein, commensurate with caspase-8 proteolysis. In contrast, within surviving fields of the hippocampus, DAP kinase interacted with the molecular chaperone 14-3-3. These data suggest DAP kinase is involved in the molecular pathways activated during seizure-induced neuronal death. 相似文献