首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7564篇
  免费   368篇
  国内免费   5篇
  7937篇
  2023年   13篇
  2022年   51篇
  2021年   73篇
  2020年   60篇
  2019年   54篇
  2018年   87篇
  2017年   73篇
  2016年   172篇
  2015年   248篇
  2014年   247篇
  2013年   540篇
  2012年   471篇
  2011年   504篇
  2010年   316篇
  2009年   291篇
  2008年   498篇
  2007年   522篇
  2006年   474篇
  2005年   465篇
  2004年   525篇
  2003年   409篇
  2002年   423篇
  2001年   89篇
  2000年   86篇
  1999年   104篇
  1998年   102篇
  1997年   87篇
  1996年   73篇
  1995年   74篇
  1994年   63篇
  1993年   57篇
  1992年   59篇
  1991年   65篇
  1990年   54篇
  1989年   43篇
  1988年   56篇
  1987年   47篇
  1986年   36篇
  1985年   29篇
  1984年   32篇
  1983年   24篇
  1982年   23篇
  1981年   27篇
  1980年   31篇
  1979年   18篇
  1978年   12篇
  1977年   20篇
  1976年   15篇
  1975年   12篇
  1974年   13篇
排序方式: 共有7937条查询结果,搜索用时 32 毫秒
51.
The antithrombotic effect of topical application of the 3-oxamethano-prostaglandin (PG) I1 analog, SM-10902 in the microcirculation and in vitro antiplatelet functions of its active form SM-10906 were estimated in comparison with PGI2 and PGE1. In rat platelets, SM-10906 evoked accumulation of intracellular cyclic adenosine 3′,5′-monophosphate, and exhibited antiaggregatory and disaggregatory activities, which were all enhanced by the phosphodiesterase inhibitor theophylline. Additionally, SM-10906 was shown to inhibit platelet adhesion to collagen in human platelet-rich plasma. PGI2 and PGE1 also showed in vitro antiplatelet effects in the order of PGI2 > SM-10906 ≥ PGE1. SM-10902 exhibited a dose-dependent antithrombotic effect in the guinea pig mesenteric arteriole by a topical application, and this activity might be exerted by the antiplatelet functions of SM-10906. Although SM-10906, PGI2 and PGE1 also showed the antithrombotic effects, SM-10902 was the most potent. In conclusion, the present studies indicate that an external topical preparation of SM-10902 may be useful for the therapy of peripheral circulatory insufficiency.  相似文献   
52.
Abstract: The functional significance of peroxynitrite in the release of [3H]GABA induced by nitric oxide (NO) liberated from NO generators was investigated using cerebral cortical neurons in primary culture. NO generators such as sodium nitroprusside (SNP) and S -nitroso- N -acetylpenicillamine (SNAP) increased [3H]GABA release in a dose-dependent manner. These increases in [3H]GABA release were significantly inhibited by hemoglobin, indicating that those NO generators evoke the release of [3H]GABA by the formation of NO. Two types of superoxide scavengers, Cu2+/Zn2+ superoxide dismutase and ceruloplasmin, significantly reduced the increase in [3H]GABA release induced by both SNP and SNAP, which assumes that NO requires superoxide to induce [3H]GABA release from the neurons. In addition, synthesized peroxynitrite induced a dose-dependent increase in [3H]GABA release from the neurons. These results indicate that NO-induced [3H]GABA release is mediated by peroxynitrite formed by the reaction of NO with superoxide.  相似文献   
53.
54.
Fitzgerald, Robert S., Machiko Shirahata, and Tohru Ide.Further cholinergic aspects of carotid body chemotransduction ofhypoxia in cats. J. Appl. Physiol.82(3): 819-827, 1997.From the 1930s into the 1970s, the role ofacetylcholine (ACh) in the carotid body's chemotransduction of hypoxiawas debated. Since the late 1970s, the issue has been pursued onlyintermittently or not at all. The purpose of this study was to testagain with a new preparation the hypothesis that ACh is an excitatoryneurotransmitter in the cat carotid body's chemotransduction ofhypoxia. We tested the effect of the specific nicotinic blockermecamylamine and the muscarinic blocker of all five muscarinicreceptors, atropine. We further tested the effects ofM1 andM2 muscarinic-receptor blockers.The carotid body region was selectively perfused with hypoxicKrebs-Ringer bicarbonate (KRB) solutions that were blocker free orcontained varying doses of the blockers. Both mecamylamine and atropinereduced the response to hypoxic KRB in a dose-related manner. TheM2 muscarinic-receptor blockersgallamine and AFDX 116 increased the response to hypoxic KRB, whereasthe M1 muscarinic-receptor blockerpirenzepine reduced the response to hypoxic KRB. These data areconsistent with an excitatory role for ACh in the carotid bodychemotransduction of hypoxia in the cat.

  相似文献   
55.
Cotyledons excised from dark-grown seedlings of cucumber (Cucumis sativus L.) were cultured in vitro under UV radiation at different wavelengths, obtained by passage of light through cut-off filters with different transmittance properties. Growth and the synthesis of chlorophyll (Chl) in cotyledons were inhibited and malondialdehyde was accumulated upon irradiation at wavelengths below 320 nm. Exogenous application of scavengers of free radicals reversed the growth inhibition induced by UV-B. Measurement of the fluorescence of Chl a suggested that electron transfer in photosystems was affected by UV-B irradiation. On the basis of these results, the involvement is postulated of active species of oxygen in damages to thylakoid membranes and the growth inhibition that are induced by UV-B irradiation.Abbreviations Chl chlorophyll - Fm maximal fluorescence (dark) - Fm maximal fluorescence (light) - Fv variable fluorescence (dark) - Fv variable fluorescence (light) - MDA malondialdehyde - O2 Superoxide radical - PS photosystem - qN non-photochemical quenching of fluorescence - qP photochemical quenching of fluorescence - UV-BBE biologically effective UV-B radiation - WL(T = 0.5) wavelength at which 50% transmittance occurs  相似文献   
56.
57.
A new specimen of an araucarian cone,Araucaria nihongii, was found attached to the vegetative organs ofYezonia vulgaris, and is described asAraucaria vulgaris comb. nov. Thick branches show characteristic bark structure with lenticular patches. Secondary wood is usually araucarioid. Leaves are arranged helically on shoots, which are imbricate, appressed and fused to surface of the stem. External and anatomical features of leaves closely resembleBrachyphyllum. The seed cone is spherical with winged bracts and thin ovuliferous scales. One seed is borne per cone-scale complex. The seed coat and nucellus wall show typical araucarian structure. An araucarian plant that boreBrachyphyllum-like foliage and aEutacta-like seed cone was predicted by Harris in 1979. This reconstructed plant,Araucaria vulgaris, supports this theory and proves the presence of an extinct characteristic-form of the genus. A new section of the genus was proposed forAraucaria vulgaris. Structure and Affinities of the Petrified Plants from the Cretaceous of Northern Japan and Saghalien XV, Consecutive number from previous paper (Nishidaet al. 1993).  相似文献   
58.
A method was developed for the determination of 3-hydroxy-3-methylglutaryl coenzyme A reductase activity in the microsomal fraction of crypt cells and villi of rat intestinal mucosa. Addition of trypsin inhibitor to homogenizing and incubation media at a proper concentration appeared inevitable for measurement of the activity of the villi fraction. The reductase in crypt cells was also slightly enhanced by the addition of the inhibitor. Using this technique, the enzyme activity in villi was found to be as active as the crypt cell fraction. Since other types of protease inhibitors were not necessarily effective, it was suggested that specific enzyme(s) inactivates the mucosal reductase in the course of measurement.  相似文献   
59.
Lemna paucicostata Hegelm. T-101, a short-day plant, flowers when plants preirradiated with red light (R) for 24 h are subjected to inductive darkness for 72 h followed by two short-day cycles (6 h R+ 18 h dark). However, flowering is inhibited by blue-or far-red-light pulses applied at the beginning of the inductive dark period. These inhibitory light effects are fully reversible by a R pulse. The action spectra for the inhibitory light effect and for its reversal show that the light pulses act exclusively through phytochrome. It is concluded that a low level of Pfr at the beginning of the inductive dark period prevents flowering.Abbreviations R red (light) - B blue (light) - FR far-red (light)  相似文献   
60.
Summary The peptide antibiotic viomycin at a concentration of 10 M inhibits E. coli ribosomes to the extent of about 70% as measured in the poly(U) system, and to about 85% in a natural mRNA (R17) system. Ribosomes from M. smegmatis show no activity at all at this concentration of the antibiotic. Experiments on the Mg2+ dependent dissociation and association of the ribosomal subunits revealed that viomycin stabilizes the 70S couples and promotes association of ribosomal subunits. This response is related to the drug action as indicated by the observation that viomycin resistant strains are not affected by viomycin with respect to dissociation and 70S couple information. A model for the inhibitory action of the drug is proposed.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号