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   4860篇
  免费   292篇
  国内免费   11篇
耳鼻咽喉   72篇
儿科学   144篇
妇产科学   165篇
基础医学   587篇
口腔科学   118篇
临床医学   507篇
内科学   866篇
皮肤病学   80篇
神经病学   327篇
特种医学   246篇
外科学   824篇
综合类   84篇
预防医学   403篇
眼科学   157篇
药学   241篇
中国医学   21篇
肿瘤学   321篇
  2023年   28篇
  2022年   76篇
  2021年   141篇
  2020年   83篇
  2019年   117篇
  2018年   144篇
  2017年   108篇
  2016年   97篇
  2015年   90篇
  2014年   165篇
  2013年   191篇
  2012年   304篇
  2011年   293篇
  2010年   172篇
  2009年   176篇
  2008年   239篇
  2007年   240篇
  2006年   235篇
  2005年   231篇
  2004年   219篇
  2003年   180篇
  2002年   187篇
  2001年   129篇
  2000年   142篇
  1999年   119篇
  1998年   55篇
  1997年   45篇
  1996年   32篇
  1995年   32篇
  1994年   35篇
  1993年   30篇
  1992年   65篇
  1991年   69篇
  1990年   52篇
  1989年   43篇
  1988年   53篇
  1987年   54篇
  1986年   65篇
  1985年   53篇
  1984年   25篇
  1983年   18篇
  1982年   19篇
  1979年   25篇
  1978年   19篇
  1976年   21篇
  1974年   27篇
  1973年   25篇
  1972年   16篇
  1971年   14篇
  1970年   14篇
排序方式: 共有5163条查询结果,搜索用时 187 毫秒
1.
2.
This study qualitatively examined factors that influenced contraceptive choices in a sample of young, HIV-infected women. Individual qualitative interviews were conducted among 30 vertically and horizontally HIV-infected women (= 26 African American) from the ages of 14 to 24 years (Mean age = 20.9 years). We recruited sample groups with the following characteristics: (a) current contraceptive/condom use with ≥1 child (= 11); (b) current contraceptive/condom use with no children (= 12); and (c) no current contraceptive/condom use with no children (= 7). A semi-structured interview guide was used to ask participants about factors influencing past and current contraceptive choices. Individual interviews were digitally recorded and transcribed verbatim; analyses to identify core themes were informed by the Grounded Theoretical approach. Young, HIV-infected women did not identify their HIV serostatus or disease-related concerns as influential in their contraceptive decisions. However, they reported that recommendations from health-care providers and input from family and friends influenced their contraceptive choices. They also considered a particular method’s advantages (e.g., menstrual cycle improvements) and disadvantages (e.g., increased pill burden) when selecting a method. Findings suggested that HIV-infected young women’s contraceptive decisions were influenced by factors other than those related to their infection.  相似文献   
3.
We report on 3 patients with pseudoathetosis, which are involuntary, slow, writhing movements due to loss of proprioception.  相似文献   
4.
Post-traumatic retinal detachment occurs frequently as a late consequence of progressive vitreous changes, especially following penetrating injuries. Occasionally, it develops soon after the trauma, without preceding proliferative vitreoretinopathy, is based on posterior vitreous detachment and morphologically resembles an idiopathic retinal detachment. It is possible that the posterior vitreous detachment in these cases is encouraged by the presence of intravitreal hemorrhage.  相似文献   
5.
6.
7.
8.
We reviewed 134 primary noncemented porous-coated total hip replacements in 125 patients: 64 were DePuy AML prostheses, 20 were Howmedica PCA and 50 were Implant Technology LSF. The prostheses had been in situ for an average of 36 months, 40 months and 24 months respectively. The average pre-operative Harris hip scores were 38.2 for AML, 33.2 for PCA, and 41.0 for the LSF prostheses. The average postoperative scores were 80.7 for AML, 83.8 for the PCA, and 91.5 for LSF. Thigh or groin pain associated with the prosthesis was present in 30% of AML, 30% PCA and 8% of the LSF cases. The clinical and radiographic review showed better early results with the LSF prostheses than the others; this seemed to be related to the implant design, which provided improved initial stability and more physiological transfer of load.  相似文献   
9.
Congenital cardiac malformations in Adams-Oliver syndrome   总被引:1,自引:0,他引:1  
Whole genomic hprt clones were used in Southern analysis to screen the integrity of the hprt gene in a family that includes a patient with HPRT enzyme deficiency causal to Lesch-Nyhan syndrome. A 5 kb DNA sequence deletion was found to have its endpoints in the first and third introns. The probes identified the carrier status of female family members, aided by an RFLP carried by the mother's normal X-chromosome.  相似文献   
10.
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