全文获取类型
收费全文 | 329篇 |
免费 | 0篇 |
专业分类
系统科学 | 21篇 |
教育与普及 | 1篇 |
理论与方法论 | 1篇 |
现状及发展 | 89篇 |
研究方法 | 14篇 |
综合类 | 203篇 |
出版年
2014年 | 6篇 |
2013年 | 2篇 |
2012年 | 6篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 10篇 |
2007年 | 5篇 |
2006年 | 11篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 11篇 |
2002年 | 9篇 |
2001年 | 15篇 |
2000年 | 10篇 |
1999年 | 7篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 12篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 17篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1974年 | 10篇 |
1973年 | 15篇 |
1972年 | 10篇 |
1971年 | 8篇 |
1970年 | 12篇 |
1969年 | 8篇 |
1968年 | 10篇 |
1967年 | 10篇 |
1966年 | 3篇 |
1965年 | 1篇 |
1964年 | 2篇 |
1958年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有329条查询结果,搜索用时 78 毫秒
41.
42.
Structure of antibody molecules 总被引:5,自引:0,他引:5
43.
44.
M. M. Cohen Ch. C. Huang H. F. Clark 《Cellular and molecular life sciences : CMLS》1967,23(9):769-771
Zusammenfassung Die somatischen Chromosomen der 3 EidechsenartenGekko gecko (2N=38),Iguana iguana (2N=34) undCrotophytus collaris (2N=36), werden dargestellt.G. gecko besitzt metazentrische, subteleozentrische und teleozentrische Elemente, aber keine Mikrochromosomen.I. iguana undC. collaris besitzen Makrochromosomen (6 Paare) und Mikrochromosomen. Bei den ArtenG. gecko undI. iguana waren in keinen von beiden Geschlechtern heteromorphische Chromosomenpaare nach zuweisen.
Supported by Project No. 417 from the U.S. Children's Bureau and Grant No. 08737 from the National Cancer Institute. 相似文献
Supported by Project No. 417 from the U.S. Children's Bureau and Grant No. 08737 from the National Cancer Institute. 相似文献
45.
Experimental autoimmune encephalomyelitis (EAE) induced by immunization to the basic protein of central nervous system myelin (BP) is a paralytic disease in which T lymphocytes attack the individual's own central nervous system. As the target is in white matter, EAE has been considered an experimental model of some aspects of human disease such as multiple sclerosis. To investigate whether autoimmune T lymphocytes could produce paralysis, we studied the effects on the electrophysiology of isolated nerves produced by T-lymphocyte lines reactive specifically to BP or other antigens. We now report that propagation of action potentials evoked by electrical stimulation was blocked by incubating optic nerves with specific anti-BP T cells. This blockade could be reversed for up to two hours by removing the anti-BP line cells from the optic nerve. The anti-BP line cells had no effect on conduction along allogeneic optic nerves or syngeneic peripheral nerves. This indicates that disruption of the function of myelin in neuroimmunological disease may result from an immunologically specific interaction between autoimmune T lymphocytes and myelin antigens. 相似文献
46.
We have partially characterized the specificity of serum lectins from the scorpion Vaejovis spinigerus Wood. Agglutination, crossed-absorption and hemagglutination-inhibition patterns were similar but not identical to serum lectins from other members from the family Vaejovidae , and different from the Buthidae species studied so far. V. spinigerus serum lectins bind sialic acids and sialoconjugates , but also bind 2-keto-3-deoxyoctonate, uronic acids and N- acylaminosugars , all substances present in bacterial cell walls suggesting that they might be involved in defense functions. 相似文献
47.
48.
The application of recombinant DNA technologies has allowed the detection of at least three families of moderately repetitive DNA segments in the human genome that are homologous to retroviruses previously isolated from mice and primates. One of these DNA segments has been shown by nucleotide sequence comparisons to be distantly related to both Moloney murine leukaemia virus (MoMuLV) and the endogenous baboon retrovirus and to have the sequence organization characteristic of an integrated retrovirus. Isolation of the homologous locus from chimpanzee DNA indicated that the integration event preceded the evolutionary divergence of chimpanzees and man. Here we have used a panel of rodent x human somatic cell hybrids to assign the chromosomal localization of this segment, called ERV1 (endogenous retrovirus-1), to human chromosome 18 (HSA 18). 相似文献
49.
50.
Cloning and endonuclease mapping of the hepatitis B viral genome. 总被引:41,自引:0,他引:41