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   5008篇
  免费   658篇
  国内免费   1篇
  2021年   75篇
  2018年   48篇
  2017年   52篇
  2016年   76篇
  2015年   129篇
  2014年   193篇
  2013年   203篇
  2012年   308篇
  2011年   291篇
  2010年   181篇
  2009年   150篇
  2008年   227篇
  2007年   234篇
  2006年   204篇
  2005年   212篇
  2004年   214篇
  2003年   197篇
  2002年   216篇
  2001年   171篇
  2000年   136篇
  1999年   112篇
  1998年   80篇
  1997年   65篇
  1996年   50篇
  1995年   47篇
  1994年   43篇
  1993年   54篇
  1992年   92篇
  1991年   109篇
  1990年   91篇
  1989年   84篇
  1988年   78篇
  1987年   67篇
  1986年   83篇
  1985年   65篇
  1984年   61篇
  1983年   63篇
  1982年   51篇
  1981年   44篇
  1980年   44篇
  1979年   59篇
  1978年   53篇
  1977年   40篇
  1976年   49篇
  1975年   53篇
  1974年   47篇
  1973年   51篇
  1972年   59篇
  1971年   36篇
  1969年   37篇
排序方式: 共有5667条查询结果,搜索用时 15 毫秒
991.
Several mollusc shells contain chitin, which is formed by a transmembrane myosin motor enzyme. This protein could be involved in sensing mechanical and structural changes of the forming, mineralizing extracellular matrix. Here we report the heterologous expression of the transmembrane myosin chitin synthase Ar-CS1 of the bivalve mollusc Atrina rigida (2286 amino acid residues, M.W. 264 kDa/monomer) in Dictyostelium discoideum, a model organism for myosin motor proteins. Confocal laser scanning immunofluorescence microscopy (CLSM), chitin binding GFP detection of chitin on cells and released to the cell culture medium, and a radiochemical activity assay of membrane extracts revealed expression and enzymatic activity of the mollusc chitin synthase in transgenic slime mold cells. First high-resolution atomic force microscopy (AFM) images of Ar-CS1 transformed cellulose synthase deficient D. discoideumdcsA cell lines are shown.  相似文献   
992.
Transforming growth factor (TGF) β is the central cytokine in fibrotic liver diseases. We analyzed whether hepatoprotective adiponectin directly interferes with TGFβ1 signaling in primary human hepatocytes (PHH). Adiponectin induces the TGFβ decoy receptor BMP-and activin-membrane-bound inhibitor (BAMBI) in PHH. Overexpression of BAMBI in hepatoma cells impairs TGFβ-mediated phosphorylation of SMAD2 and induction of connective tissue growth factor. BAMBI is lower in human fatty liver with a higher susceptibility to liver fibrosis and negatively correlates with BMI of the donors. Hepatic BAMBI is reduced in rodent models of liver inflammation and fibrosis. In summary, the current data show that hepatoprotective effects of adiponectin include induction of BAMBI which is reduced in human fatty liver and rodent models of metabolic liver injury.  相似文献   
993.
Weiss KM  Buchanan AV 《Genetics》2011,188(4):761-771
Genes are generally assumed to be primary biological causes of biological phenotypes and their evolution. In just over a century, a research agenda that has built on Mendel's experiments and on Darwin's theory of natural selection as a law of nature has had unprecedented scientific success in isolating and characterizing many aspects of genetic causation. We revel in these successes, and yet the story is not quite so simple. The complex cooperative nature of genetic architecture and its evolution include teasingly tractable components, but much remains elusive. The proliferation of data generated in our "omics" age raises the question of whether we even have (or need) a unified theory or "law" of life, or even clear standards of inference by which to answer the question. If not, this not only has implications for the widely promulgated belief that we will soon be able to predict phenotypes like disease risk from genes, but also speaks to the limitations in the underlying science itself. Much of life seems to be characterized by ad hoc, ephemeral, contextual probabilism without proper underlying distributions. To the extent that this is true, causal effects are not asymptotically predictable, and new ways of understanding life may be required.  相似文献   
994.
1. Maternal investment in egg quality can have important consequences for offspring fitness. For example, yolk antioxidants can affect embryonic development as well as juvenile and adult phenotype. Thus, females may be selected to advertise their yolk antioxidant deposition to discriminatory males via ornamental signals, perhaps depending on the reproductive costs associated with signal production. 2. Female striped plateau lizards (Sceloporus virgatus) develop pterin-based orange colour patches during the reproductive season that influence male behaviour and that are positively associated with the phenotypic quality of the female and her offspring. Here, we assessed one potential developmental mechanism underlying the relationship between offspring quality and female ornamentation in S. virgatus, by examining the relationship between ornament expression and yolk antioxidant levels. 3. As expected, concentrations of the yolk antioxidants vitamin A, vitamin E and carotenoids (lutein and zeaxanthin) were strongly positively intercorrelated. Eggs from larger clutches had fewer antioxidants than eggs from smaller clutches, suggesting that females may be limited in antioxidant availability or use. Fertilized and unfertilized eggs did not differ in yolk antioxidant levels. 4. The size of a female's ornament was positively related to both the concentration and total amount of yolk antioxidants, and ornament colour was positively related to yolk antioxidant concentration. Thus, in S. virgatus, female ornaments may advertise egg quality. In addition, these data suggest that more ornamented females may produce higher-quality offspring, in part because their eggs contain more antioxidants. As the colour ornament of interest is derived from pterins, not carotenoids, direct resource trade-offs between ornaments and eggs may be eliminated, reducing reproductive costs associated with signalling. 5. This is the first example of a positive relationship between female ornamentation and yolk antioxidants in reptiles and may indicate the general importance of these patterns in oviparous vertebrates.  相似文献   
995.
Two autotrophic carbon fixation cycles have been identified in Crenarchaeota. The dicarboxylate/4-hydroxybutyrate cycle functions in anaerobic or microaerobic autotrophic members of the Thermoproteales and Desulfurococcales. The 3-hydroxypropionate/4-hydroxybutyrate cycle occurs in aerobic autotrophic Sulfolobales; a similar cycle may operate in autotrophic aerobic marine Crenarchaeota. Both cycles form succinyl-coenzyme A (CoA) from acetyl-CoA and two molecules of inorganic carbon, but they use different means. Both cycles have in common the (re)generation of acetyl-CoA from succinyl-CoA via identical intermediates. Here, we identified several missing enzymes/genes involved in the seven-step conversion of succinyl-CoA to two molecules of acetyl-CoA in Thermoproteus neutrophilus (Thermoproteales), Ignicoccus hospitalis (Desulfurococcales), and Metallosphaera sedula (Sulfolobales). The identified enzymes/genes include succinyl-CoA reductase, succinic semialdehyde reductase, 4-hydroxybutyrate-CoA ligase, bifunctional crotonyl-CoA hydratase/(S)-3-hydroxybutyryl-CoA dehydrogenase, and beta-ketothiolase. 4-Hydroxybutyryl-CoA dehydratase, which catalyzes a mechanistically intriguing elimination of water, is well conserved and rightly can be considered the key enzyme of these two cycles. In contrast, several of the other enzymes evolved from quite different sources, making functional predictions based solely on genome interpretation difficult, if not questionable.  相似文献   
996.
997.
The Victorian poet Elizabeth Barrett Browning suffered for most of her life from an illness that her physicians were never able to diagnose, and that Barrett Browning scholars and others have tried to diagnose since her death in 1861. Many suggestions have been offered, but none has been convincing. By happenstance, my daughter was reading the correspondence of Elizabeth and Robert Browning not long ago, and she recognized the symptoms described as those of the rare muscle-weakening disorder she herself has, hypokalemic periodic paralysis (HKPP). The evidence from Barrett Browning's letters and the diary she kept when she was 25 strongly suggest she too had HKPP.  相似文献   
998.
Evolutionary Science has, at least since the publication of Origin, been less concerned with the continuation of species in stable forms, than with the reconfiguration of forms into a host of varieties. So influential has this emphasis been that, over the years, “variation” has become a cardinal desideratum, even taking precedence over the macroevolutionary landscape. This orientation has made it much more difficult to objectively assess the meaning of non-change patterns such as periods of stasis, which appear to be widespread in most species. Yet, if stasis is an expectable outcome of evolutionary activity, this raises the possibility that there may be mechanisms and processes at many causal levels, acting on its behalf, without reference to the impetus toward persistent variation. Researchers have been reluctant to attribute stasis to a macroevolutionary tendency toward ‘stability’ despite the commonality of stasis in many species, and notwithstanding the many biological/behavioral processes that seem inclined to produce and maintain conformance, regulation and consistency. Speciation, paradoxically, is the best evidence for an overriding influence toward stability in that stability would seem to be a necessary condition prior to the development of isolating mechanisms. An alternative macroevolutionary model of biological activity is offered consisting of two tendencies, “variety” counterpoised with “stability” both acting in the service of the persistence of life.  相似文献   
999.
1000.
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