全文获取类型
收费全文 | 17987篇 |
免费 | 97篇 |
国内免费 | 227篇 |
专业分类
系统科学 | 383篇 |
丛书文集 | 382篇 |
教育与普及 | 72篇 |
理论与方法论 | 60篇 |
现状及发展 | 6248篇 |
研究方法 | 776篇 |
综合类 | 9869篇 |
自然研究 | 521篇 |
出版年
2014年 | 140篇 |
2013年 | 278篇 |
2012年 | 480篇 |
2011年 | 1013篇 |
2010年 | 360篇 |
2009年 | 343篇 |
2008年 | 528篇 |
2007年 | 612篇 |
2006年 | 607篇 |
2005年 | 543篇 |
2004年 | 399篇 |
2003年 | 308篇 |
2002年 | 318篇 |
2001年 | 507篇 |
2000年 | 559篇 |
1999年 | 411篇 |
1992年 | 288篇 |
1991年 | 252篇 |
1990年 | 250篇 |
1989年 | 229篇 |
1988年 | 209篇 |
1987年 | 226篇 |
1986年 | 203篇 |
1985年 | 245篇 |
1984年 | 235篇 |
1983年 | 159篇 |
1982年 | 172篇 |
1981年 | 157篇 |
1980年 | 199篇 |
1979年 | 445篇 |
1978年 | 340篇 |
1977年 | 367篇 |
1976年 | 264篇 |
1975年 | 322篇 |
1974年 | 446篇 |
1973年 | 379篇 |
1972年 | 360篇 |
1971年 | 421篇 |
1970年 | 484篇 |
1969年 | 425篇 |
1968年 | 407篇 |
1967年 | 442篇 |
1966年 | 384篇 |
1965年 | 301篇 |
1959年 | 155篇 |
1958年 | 231篇 |
1957年 | 179篇 |
1956年 | 138篇 |
1955年 | 154篇 |
1954年 | 132篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
631.
Normal dystrophin transcripts detected in Duchenne muscular dystrophy patients after myoblast transplantation. 总被引:26,自引:0,他引:26
E Gussoni G K Pavlath A M Lanctot K R Sharma R G Miller L Steinman H M Blau 《Nature》1992,356(6368):435-438
632.
F Gao L Yue A T White P G Pappas J Barchue A P Hanson B M Greene P M Sharp G M Shaw B H Hahn 《Nature》1992,358(6386):495-499
Our understanding of the biology and origins of human immunodeficiency virus type 2 (HIV-2) derives from studies of cultured isolates from urban populations experiencing epidemic infection and disease. To test the hypothesis that such isolates might represent only a subset of a larger, genetically more diverse group of viruses, we used nested polymerase chain reactions to characterize HIV-2 sequences in uncultured mononuclear blood cells of two healthy Liberian agricultural workers, from whom virus isolation was repeatedly unsuccessful, and from a culture-positive symptomatic urban dweller. Analysis of pol, env and long terminal repeat regions revealed the presence of three highly divergent HIV-2 strains, one of which (from one of the healthy subjects) was significantly more closely related to simian immunodeficiency viruses infecting sooty mangabeys and rhesus macaques (SIVSM/SIVMAC) than to any virus of human derivation. This subject also harboured multiply defective viral genotypes that resulted from hypermutation of G to A bases. Our results indicate that HIV-2, SIVSM and SIVMAC comprise a single, highly diverse group of lentiviruses which cannot be separated into distinct phylogenetic lineages according to species of origin. 相似文献
633.
根据热力学第二定律,应用熵平衡法对热力系统进行分析和设计。作为实例,应用此方法分析以溴化锂—水为工质的单级制冷系统和单级热转换器系统。结果表明,熵平衡法不仅可以获得如能量法和(火用)分析法相同的结果,而且还可清晰地揭示系统中各个过程的不可逆性,对系统性能系数和效率的影响。该系数和效率仅取决于过程的性质而与环境条件无关。 相似文献
634.
Ehrlich carcinoma and EL-4 thymoma ascites cells were subjected in vitro to heat shock, ATP depletion, oxidative stress, Ca2+ overlading and iodoacetamide treatment. After the transient stresses, Triton (X-100)-insoluble TIS) fractions were isolated from the cells and analysed by electrophoresis and immunoblotting. All stresses used caused rapid aggregation of cell proteins. This was manifested in a signficant rise in protein content in the TIS fractions. The protein increase was mostly due to and increase in the insolubility of actin, 57 kDa protein of intermediate filaments, 70 kDa heat shock protein (HSP 70), and some specific proteins whose insolubilization was a characteristic sign for each type of cell injury. Different survival rates in the cell lines after either stress corrlated well with differences in their TIS protein accretion. Possible mechanisms for stress-induced protein aggregation and its relationship with cell viability are suggested. 相似文献
635.
R. J. Capon K. Elsbury M. S. Butler C. C. Lu J. N. A. Hooper J. A. P. Rostas K. J. O'Brien L. -M. Mudge A. T. R. Sim 《Cellular and molecular life sciences : CMLS》1993,49(3):263-264
The Antarctic marine spongeTedania charcoti has been shown to contain extraordinarily high natural concentrations of cadmium and zinc, which have in turn been correlated to the ability of the crude ethanol extract to modulate protein phosphorylation in chicken forebrain and to inhibit the growth of several test bacteria. 相似文献
636.
In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found that the geometrical shape of travellers is the key factor affecting the yarnhairiness at ring spinning. 相似文献
637.
The differences of thermal conduction and its temperature-varying track of the heat source body at various structural environments have been studied. Hypothetically , geologic heat source body is cut successively into several segregative bodies with a fixed cubage . With the segmented number increasing , the conductive surface area of heat source body begins to get larger, which separately is similar to the heat geologic body in different tectonic zones that
has a various enclosed coefficient . Finite-element simulation result shows that
the thermal conduction speed of spreading from the heat source body to its wall rock is slow→higher→ highest, when heat source bodies are situated respectively at compressive, shear and tensile deformation zones, corresponding rates of their temperature drop are low→ higher→ highest .
Research indicates that the temperature ' s dropping rate of heat source body has an inverse relationship with enclosed coefficient η for different structural zones . This result can explain the tectono-physicochemical reason of magmatite evolution and its. difference . 相似文献
638.
A plant regulator controlling development of symbiotic root nodules 总被引:37,自引:0,他引:37
639.
640.