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   39655篇
  免费   135篇
  国内免费   168篇
系统科学   186篇
丛书文集   545篇
教育与普及   76篇
理论与方法论   126篇
现状及发展   17622篇
研究方法   1628篇
综合类   19149篇
自然研究   626篇
  2013年   315篇
  2012年   563篇
  2011年   1172篇
  2010年   255篇
  2008年   694篇
  2007年   824篇
  2006年   765篇
  2005年   816篇
  2004年   820篇
  2003年   719篇
  2002年   732篇
  2001年   1239篇
  2000年   1186篇
  1999年   803篇
  1994年   388篇
  1992年   773篇
  1991年   551篇
  1990年   618篇
  1989年   601篇
  1988年   566篇
  1987年   613篇
  1986年   655篇
  1985年   818篇
  1984年   595篇
  1983年   519篇
  1982年   478篇
  1981年   487篇
  1980年   515篇
  1979年   1302篇
  1978年   1007篇
  1977年   932篇
  1976年   755篇
  1975年   780篇
  1974年   1089篇
  1973年   942篇
  1972年   952篇
  1971年   1072篇
  1970年   1476篇
  1969年   1148篇
  1968年   1067篇
  1967年   1067篇
  1966年   1000篇
  1965年   747篇
  1959年   376篇
  1958年   720篇
  1957年   477篇
  1956年   407篇
  1955年   365篇
  1954年   414篇
  1948年   285篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
Summary The ability of liposomes composed of different kinds of phospholipid materials to adhere to the surface of the cornea was studied in the rabbit. The liposomes were labelled with tracer amounts of an I125-labelled phosphatidylethanolamine derivative and were instilled in 10 l drops onto the cornea. The retention of radioactivity was monitored. The results show that liposomes containing positively charged phospholipids are better retained than an albumin control. Thus, it may be possible to develop a drug delivery, liposome system which would permit long-term sustained release of ophthalmic drugs onto the cornea.  相似文献   
123.
Summary The in vitro absorption of calcium from the duodenum was significantly less in a group of rats fed on a wheat diet than in a group fed a wheat and Bengal gram (7030) diet.  相似文献   
124.
Summary Histamine content in the rat hypothalamus was lower at 4°C and higher at 31°C compared to that at 21°C. Pretreatment with -fluoromethylhistidine, a suicide inhibitor of histidine decarboxylase, attenuated both the increased level of hypothalamic histamine and rat adaptive behavior at 31°C. Increase of histamine content in the hypothalamus appears to be an important factor contributing to rat adaptive behavior to high environmental temperature.  相似文献   
125.
Summary Suc-Tyr-(SE)-Met-Gly-Trp-Met-Asp--phenethylamide (GE 410) competitively antagonized the contractions of smooth muscle strips from guinea pig ileum (pA2=7.6, n=0.95) induced by cholecystokinin-octapeptide (CCK8). GE 410 inhibited the electrically-induced cholinergically mediated contractile responses and the [3H]ACh release in the ileum, as well as the CCK-stimulated electrical contractile responses and the [3H]ACh release in the cholinergic nerve terminals. The results suggest the existence of CCK-receptors not only in the smooth muscles but also on the neurons.  相似文献   
126.
Summary Gigantecin (I), a novel tetrahydroxy-di-tetrahydrofuran fatty acid -lactone (acetogenin), was isolated from an ethanolic extract of the stem bark ofGoniothalamus giganteus Hook. f., Thomas (Annonaceae), by means of activity-directed fractionation (brine shrimp lethality test). This new compound is extremely cytotoxic to human tumor cells, inhibits crown gall tumors on potato discs, and is active in an assay designed to detect antimitotic agents (9 ASK).  相似文献   
127.
Summary The contribution of Bayes to statistical inference has been much discussed, whereas his evaluations of the beta probability integral have received little attention, and Price's improvements of these results have never been analysed in detail. It is the purpose of the present paper to redress this state of affairs and to show that the Bayes-Price approximation to the two-sided beta probability integral is considerably better than the normal approximation, which became popular under the influence of Laplace, although it had been stated by Price.The Bayes-Price results are obtained by approximating the skew beta density by a symmetric beta density times a factor tending to unity for n , the two functions having the same maximum and the same points of inflection. Since the symmetric beta density converges to the normal density, all the results of Laplace based on the normal distribution can be obtained as simple limits of the results of Bayes and Price. This fact was not observed either by Laplace or by Todhunter.  相似文献   
128.
Summary Fibronectins (FN) are adhesive glycoproteins whose role in platelet aggregation is unclear. Addition of 3, 6 and 12 g/ml of human plasma FN in vitro to isolated human platelets, which had been freed from plasma FN by gel filtration and subsequently stimulated with collagen, inhibited the last stage of platelet aggregation. With 3 and 6g/ml of FN a shortening of the lag-time was also observed. These data showed that FN may play a role in platelet-collagen interaction as well as in platelet-platelet interaction.  相似文献   
129.
Coyne JA 《Nature》1990,344(6261):30
  相似文献   
130.
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