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   124679篇
  免费   8246篇
  国内免费   454篇
耳鼻咽喉   1632篇
儿科学   3301篇
妇产科学   2071篇
基础医学   15968篇
口腔科学   2370篇
临床医学   12546篇
内科学   26365篇
皮肤病学   1915篇
神经病学   11990篇
特种医学   4306篇
外国民族医学   4篇
外科学   18014篇
综合类   1888篇
现状与发展   1篇
一般理论   167篇
预防医学   11114篇
眼科学   2914篇
药学   8710篇
  2篇
中国医学   172篇
肿瘤学   7929篇
  2023年   511篇
  2022年   831篇
  2021年   2072篇
  2020年   1228篇
  2019年   2015篇
  2018年   2322篇
  2017年   1786篇
  2016年   1958篇
  2015年   2414篇
  2014年   3440篇
  2013年   5333篇
  2012年   7764篇
  2011年   8285篇
  2010年   4690篇
  2009年   4512篇
  2008年   7968篇
  2007年   8514篇
  2006年   8356篇
  2005年   8639篇
  2004年   8170篇
  2003年   8003篇
  2002年   7575篇
  2001年   1184篇
  2000年   935篇
  1999年   1236篇
  1998年   1705篇
  1997年   1424篇
  1996年   1162篇
  1995年   1147篇
  1994年   943篇
  1993年   960篇
  1992年   762篇
  1991年   708篇
  1990年   677篇
  1989年   628篇
  1988年   580篇
  1987年   545篇
  1986年   551篇
  1985年   665篇
  1984年   831篇
  1983年   830篇
  1982年   1163篇
  1981年   1052篇
  1980年   951篇
  1979年   465篇
  1978年   576篇
  1977年   551篇
  1976年   449篇
  1975年   408篇
  1974年   365篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
A systematic review of the features that indicate intentional scalds in children .
Maguire S. , Moynihan S. , Mann M. , Potokar T. & Kemp A. M. ( 2008 ) Burns , 34 , 1072 – 1081 .
DOI: 10.1016/j.burns.2008.02.011 .  相似文献   
73.
74.
Long-term effects of organized violence on young Middle Eastern refugees' mental health .
Montgomery E. ( 2008 ) Social Science & Medicine , 67 , 1596 – 1603 .
DOI: 10:1016/j.socscimed.2008.07.020.  相似文献   
75.
Outcomes of conduct problems in adolescence: 40-year follow-up of national cohort .
Colman I. , Murray J. , Abbott R. A. , Maughan B. , Kuh D. , Croudace T. J. & Jones P. B. ( 2009 ) BMJ , 338 , a2981 .
DOI: 10.1136/bmj.a2981 .  相似文献   
76.
BACKGROUND: Effects of risperidone on cognitive function in children with disruptive behavior disorders (DBDs) and subaverage intelligence quotient (IQ) were assessed. METHODS: Data from two 6-week, double-blind, placebo-controlled studies (n = 228) were combined, as were three 1-year, open-label studies (n = 688). Patients with DBDs and subaverage IQ, 5 to14 years, received placebo or risperidone .02 to .06 mg/kg/day. Cognitive measures included the Continuous Performance Task (CPT) and Verbal Learning Test for Children (VLT-C). Efficacy was assessed using the Nisonger Child Behavior Rating Form (NCBRF). Adverse events were collected via spontaneous report; sedation was assessed using visual analog scale. RESULTS: Improvements on the NCBRF Conduct Problem subscale were significantly greater for risperidone- versus placebo-treated patients (-15.8 vs. -6.4, p < .0001) in short-term studies; significant reductions were observed in long-term studies (-16.3, p < .0001). No overall decline and some significant improvement in attention (CPT) and memory (VLT-C) were noted regardless of treatment in short-term studies. VLT-C improved significantly (p < .0001) for both groups, with no difference between treatment groups. Improvements in memory (VLT-C) and attention (CPT) were noted in long-term studies. Somnolence/sedation did not affect cognitive function. CONCLUSIONS: Cognitive function was not altered by risperidone in short-term studies and was maintained or improved with one year of treatment in children with DBDs and subaverage IQ, potentially representing age-appropriate gains.  相似文献   
77.
Polycythemia vera is a myeloproliferative disease, which, if untreated, leads to thrombohemorrhagic complications and eventually to progressive myelofibrosis, anemia, and splenomegaly. Two newly available drugs, interferon alfa and imatinib mesylate, may alter the course of this disease. Used as single agents, each produces lasting remissions in about 75% of patients with polycythemia vera. Of significance, change in JAK2 expression has been reported after treatment with both agents.  相似文献   
78.
79.
Monoclonal antibodies against human and bovine 2′:3′-cyclic nucleotide 3′-phosphodiesterase (CNPase) were generated by fusing FOX-NY myeloma cells with spleen cells from RBF/Dn mice previously immunized with the purified brain antigens. The enzyme isolated from bovine brain was quite basic, with an isoelectric point of 9.71 and both the bovine and human enzymes consisted of a closely spaced doublet at approximately 44 and 46 kDa on SDS-PAGE. Six monoclonals were identified as strongly recognizing the enzyme on both ELISA plates and on immunoblots of whole brain protein. Four monoclonals very weakly cross-reacted with guinea pig myelin basic protein. In contrast with two previous reports, some of our monoclonal antibodies did immunostain 2 or 3 protein bands in peripheral nerve, two bands closely corresponding to those immunostained in central nervous system (CNS) myelin, the Wolfgram protein fraction and in acetone powders of whole brain. Each of the 6 monoclonals reacting strongly on immunoblots recognized the enzyme in from 2 to 5 of the species examined (human, bovine, rat, mouse and rabbit). In addition, all 6 monoclonals that immunostained the enzyme in whole brain, myelin and Wolfgram protein immunoblots recognized both CNP1 (44 kDa) and CNP2 (46 kDa). The two closely spaced protein bands observed on SDS-PAGE and previously stained on immunoblots of CNS CNPase using polyvalent rabbit anti-bovine CNPase antisera, and now different monoclonal antibodies, appear to be immunologically related and to contain highly conserved sequences.  相似文献   
80.
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