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   69636篇
  免费   6282篇
  国内免费   5118篇
耳鼻咽喉   401篇
儿科学   741篇
妇产科学   880篇
基础医学   8765篇
口腔科学   1192篇
临床医学   9344篇
内科学   10620篇
皮肤病学   775篇
神经病学   3657篇
特种医学   2494篇
外国民族医学   41篇
外科学   7096篇
综合类   11962篇
现状与发展   17篇
一般理论   2篇
预防医学   4268篇
眼科学   1831篇
药学   7399篇
  74篇
中国医学   3686篇
肿瘤学   5791篇
  2024年   225篇
  2023年   1196篇
  2022年   2849篇
  2021年   3599篇
  2020年   2605篇
  2019年   2385篇
  2018年   2386篇
  2017年   2049篇
  2016年   2056篇
  2015年   3141篇
  2014年   3943篇
  2013年   3273篇
  2012年   4791篇
  2011年   5669篇
  2010年   3283篇
  2009年   2498篇
  2008年   3433篇
  2007年   3554篇
  2006年   3617篇
  2005年   3456篇
  2004年   2235篇
  2003年   2196篇
  2002年   1835篇
  2001年   1690篇
  2000年   1773篇
  1999年   1978篇
  1998年   1279篇
  1997年   1379篇
  1996年   1033篇
  1995年   910篇
  1994年   780篇
  1993年   512篇
  1992年   602篇
  1991年   526篇
  1990年   452篇
  1989年   412篇
  1988年   331篇
  1987年   293篇
  1986年   255篇
  1985年   177篇
  1984年   110篇
  1983年   75篇
  1982年   42篇
  1981年   56篇
  1980年   40篇
  1979年   40篇
  1978年   2篇
  1976年   3篇
  1975年   3篇
  1903年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
自普遍接种麻疹减毒活疫苗以来 ,麻疹的发病率已明显下降。但在某些地区仍有发生和流行 ,其合并症仍然是患儿死亡的主要原因。而喉炎是该病常见的合并症之一 ,又是危及患儿生命的重要病症。自 1995年~ 2 0 0 2年 ,我院儿科共收住麻疹 132例 ,其中 6 8例合并喉炎 ,我们采用中西  相似文献   
43.
44.
Summary Reported in this paper is the first case of isolation ofPseudalle-Scheria boydii from cerebral spinal fluid of a boy with meningitis in China. Morphology and culture were observed by light microscopy, electron scanning microscopy and transmission electron microscopy. In addition, mycelium antigen prepared by SDS-PAGE was compared with that of the other strain of Scedosporium apiospermum. Both of the strains showed more than 40 peptide lines. Their molecular weight was very similar. On the CS-930 Dual-Wavelength TLC Scanner the peaks of both antigens showed to lie in nearly the same position. It could be concluded thatPseudallescheria boydii andScedosporium apiospermum belong to the same genus, but they are of different strains and reproductive phases.  相似文献   
45.
胆红素具有重要药用价值,一般用化学方法从胆汁中提取,本试验根据胆红素在人体内的代谢过程和胆结石的成因,而是利用大肠杆菌产生的β葡萄糖醛酸酶从胆汁中提取胆红素。  相似文献   
46.
Recently, a long-acting, somatostatin analogue, SMS201-995(SMS), has been developed and extensively investigated. It has been proved to be remarkably effective in treating many diseases, including active acromegaly. We observed the effect of SMS on gallbladder contractility in normal adults using the fatty meal test. Our results show that gallbladder contractility was inhibited significantly for 6 hours after the subcutaneous injection of SMS in dosages of 50, 25, 12.5, and 5 micrograms. We conclude that it is not practical to avoid gallbladder disfunction during long-term SMS treatment by decreasing the dosages of SMS.  相似文献   
47.
Mongrel or beagle dogs were submitted to bile duct ligation, or to extraenteric biliary diversion by means of choledochoureterostomy. The kinetics of intravenously administered FK506 was not changed from control status two weeks after bile duct ligation, but the bioavailability of orally administered FK506 was nearly quadrupled. Following oral administration, the absorption of FK506 was highly variable. The results indicate that in dogs FK506 is absorbed from the intestine just as efficiently in the absence of enteric bile and in presence of exogenous bile salt supplement when compared with its absorption in presence of normal bile drainage. These findings with FK506 are different from those with cyclosporine after biliary obstruction or diversion and will have important practical as well as experimental ramifications.  相似文献   
48.
This paper examines two approaches for the analysis of quantitative traits: (1) association studies and (2) linkage studies. The trait studied was Q1 from simulated Problem 2 data set in Genetic Analysis Workshop 9. Our purpose was to evaluate associations present in the data, to identify nongenetic and genetic predictors of the trait, and to explore the simulated genome for linkage. Through the association study, we found evidence for the primary major gene associated with this trait. The linkage study found evidence of residual genetic effect acting through other traits. Adjustments of Q1 for Q2 and Q3 led to a failure to find significant effects of MG2 and MG3. This supports the suggestion that adjustment for genetically influenced traits for effects of other genetic traits can reduce the power to detect major gene effects. In summary, we detected the major gene directly associated with the trait of interest through association studies. Linkage analysis detected evidence for two other genes associated to a lesser degree with the trait. © 1995 Wiley-Liss, Inc.  相似文献   
49.
王娟  朱念琼 《护理研究》2006,20(6):551-552
自身练习护理操作就是以护生作为练习对象,相互间在各自身上完成注射、输液等操作练习项目,以达到教学要求[1]。在基础护理的教学中,自身练习对于调动护生的参与感,增加真实感,满足成就感方面起着十分重要的作用。但是,也必须看到在积极效果背后的种种矛盾以及由这些矛盾可能导  相似文献   
50.
On the basis of the common occurrence of high concentration of estrogen and activated macrophages in patients with endometriosis, we postulate that interaction between 17beta-estradiol and macrophage may be an important affair in endometriosis. So our study was focused on the effect of 17beta-estradiol on macrophage. First morphology of macrophages was examined with environmental scanning electron microscopy. Increased size, extension of more microvilli, expression of retraction fibers and elaboration of membrane ruffles were detected in 17beta-estradiol treated macrophages. Then Nitrate and nitrite level in the supernatant was measured by the method of Griess and iNOS expression was analyzed using immunohistochemical staining. It showed that 17beta-estradiol could induce NO release from peritoneal macrophages and expression of iNOS was increased. Also more TNF-alpha in supernatant that was measured by MTT via L929 cell was produced by macrophages under the inducing of 17beta-estradiol. Furthermore, [Ca2+]i, which was viewed by microscope in a laser scanning confocal unit, elevated 39.8% in peritoneal macrophages after 17beta-estradiol 100 nmol/L treated. The results above demonstrated that peritoneal macrophage had been activated in both morphology and cytokine line when interaction with 17beta-estradiol, which indicated that macrophage activated by 17beta-estradiol might play a permission role in development of endometriosis.  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