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   17970篇
  免费   56篇
  国内免费   123篇
系统科学   285篇
丛书文集   466篇
教育与普及   36篇
理论与方法论   50篇
现状及发展   7956篇
研究方法   726篇
综合类   8482篇
自然研究   148篇
  2012年   214篇
  2011年   417篇
  2010年   118篇
  2009年   109篇
  2008年   286篇
  2007年   361篇
  2006年   299篇
  2005年   310篇
  2004年   305篇
  2003年   427篇
  2002年   458篇
  2001年   750篇
  2000年   697篇
  1999年   405篇
  1993年   87篇
  1992年   328篇
  1991年   254篇
  1990年   299篇
  1989年   272篇
  1988年   262篇
  1987年   276篇
  1986年   284篇
  1985年   338篇
  1984年   242篇
  1983年   219篇
  1982年   200篇
  1981年   238篇
  1980年   261篇
  1979年   568篇
  1978年   463篇
  1977年   469篇
  1976年   351篇
  1975年   375篇
  1974年   583篇
  1973年   455篇
  1972年   413篇
  1971年   510篇
  1970年   656篇
  1969年   573篇
  1968年   492篇
  1967年   528篇
  1966年   439篇
  1965年   330篇
  1959年   198篇
  1958年   293篇
  1957年   192篇
  1956年   172篇
  1955年   167篇
  1954年   159篇
  1948年   87篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Summary The effects of L-glutamic acid and of some glutamate analogues have been studied on the central nervous system of the snailHeobania vermiculata, using conventional electrophysiological techniques. The glutamate H-response had the mean equilibrium value of-(57±4) mV and was associated with a Cl conductance change. The D-response to glutamate application showed an involvement of sodium ions. Aspartate was agonist of glutamate action and displayed similar equilibrium value of the H-response, whereas quisqualate H-response was non-invertible.The authors wish to express their thanks to Prof. A. Curatolo for his continual interest and advice, and to Dr J. Stinnakre for the criticism of the text.  相似文献   
102.
A strain of Aspergillus fumigatus Fres., isolated from sugar-beet draffs, synthesizes in vitro four toxic metabolites which have not yet been described in these fungal species. Toxic effects of the most abundant of these metabolites "fumitoxin A" have been studed on chick embryo. Artemia salina larvae, cell cultures, and on mice.  相似文献   
103.
Under well defined conditions ribosomal RNAs purified from Escherichia coli can be degraded by ribonuclease U2 giving rise to RNA fragments of 60--70 nucleotides. In vitro, these fragments are efficiently transcribed into a complementary DNA by DNA polymerase RNA dependent, partially purified from extracts of E. coli. In vivo, "RNA-fragments-U2" inhibit the development of plant tumors.  相似文献   
104.
A L Newsome  J P Harley 《Experientia》1978,34(12):1567-1568
Daily administration of vitamin D3 (75,000 IU/kg b. wt) for 7 days accelerated Trichinella spiralis cyst calcification in rats with a 14-week-old infection. When disodium ethane-1-hydroxy-1, 1-diphosphonate (EHDP) was administered (50 mg/kg b. wt) from 2 days before until 2 days after vitamin D3 treatment, cyst calcification was inhibited. Thus, the ability to inhibit E. spiralis calcification has demonstrated for the first time.  相似文献   
105.
The spontaneous conversion of mammalian cyclic GMP-dependent protein kinase (G-PK) into modulator-dependent protein kinase (type II) (M-PKII) in the absence of cGMP or histone was observed in vitro. The findings, together with similarity in substrate protein specificity, suggest that M-PKII is the catalytic subunit of mammalian G-PK.  相似文献   
106.
H-Y Evolution     
Summary The female: male sex ratio in litters born to C57 black mice immunized with male spleen preparations is 21 and males were stillborn. In additionDrosophila busckii males are H-Y antigen positive. It is argued that H-Y is the primary testicular determinant and that this role is evolutionarily ancient.  相似文献   
107.
Summary Analogues of glutamic acid, -methylglutamic acid and glutamine in which the -or -COOH groups are replaced by PO3H2 or P(O)(OH3)OH functions competitively inhibit rat liver glutamine synthetase. The K1 values are comparable to or lower than KM for L-glutamate.This study was supported by grant R.1.9.  相似文献   
108.
Summary Subdermal injections of PGE2 (5 g) in the rat foot lead to increases in the potentials evoked in sensory nerve branches by the mechanical stimulation of the skin. This sensitization of both A and C fibres complements the previously described hyperalgesic effects of prostaglandins of the E series.  相似文献   
109.
Summary Stroma-free hemoglobin solutions present some drawbacks when used as blood substitutes, essentially because the hemoprotein has a low vascular retention, due to its small hydrodynamic volume. Covalent coupling of the protein with dextran derivatives artificially increases its size and affords polymeric conjugates whose oxygen-binding properties (Barcroft's curve, Hill coefficient) depend on the molecular weight.The authors wish to thank Prof. J. Neel and Prof. C. Vigneron for useful discussions and criticism.  相似文献   
110.
Summary The radiations coming from Blanc Brillant de Luxe' fluorescent stimulate the growth and ramification of protonema ofCeratodon purpureus (Hedw.) Brid. This stimulation is caused by red light (660 nm). Multidirectional lightening is more favorable than unidirectional exposition.  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