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   2016篇
  免费   137篇
  国内免费   24篇
耳鼻咽喉   16篇
儿科学   49篇
妇产科学   41篇
基础医学   240篇
口腔科学   61篇
临床医学   246篇
内科学   369篇
皮肤病学   49篇
神经病学   164篇
特种医学   179篇
外科学   163篇
综合类   99篇
一般理论   2篇
预防医学   214篇
眼科学   60篇
药学   118篇
中国医学   25篇
肿瘤学   82篇
  2021年   20篇
  2020年   13篇
  2019年   14篇
  2018年   25篇
  2017年   18篇
  2016年   25篇
  2015年   28篇
  2014年   43篇
  2013年   100篇
  2012年   49篇
  2011年   58篇
  2010年   56篇
  2009年   55篇
  2008年   65篇
  2007年   90篇
  2006年   70篇
  2005年   52篇
  2004年   51篇
  2003年   68篇
  2002年   60篇
  2001年   63篇
  2000年   52篇
  1999年   48篇
  1998年   65篇
  1997年   60篇
  1996年   50篇
  1995年   41篇
  1994年   45篇
  1993年   48篇
  1992年   37篇
  1991年   41篇
  1990年   36篇
  1989年   68篇
  1988年   47篇
  1987年   49篇
  1986年   39篇
  1985年   24篇
  1984年   42篇
  1983年   25篇
  1982年   19篇
  1981年   16篇
  1980年   15篇
  1979年   16篇
  1977年   19篇
  1975年   13篇
  1973年   13篇
  1972年   12篇
  1969年   10篇
  1967年   11篇
  1941年   11篇
排序方式: 共有2177条查询结果,搜索用时 15 毫秒
1.
2.
Background. Extensive questioning of patients with a wide variety of skin disorders led to the impression that nocturnal overheating was probably an important factor in the initiation and the perpetuation of many skin disorders. Methods. In order to test the hypothesis, 12 “clean-skinned” subjects (6M/6F) aged 18 to 45 years were monitored electronically every 30 seconds during an 8 hour sleep period (2300 to 0700 hours), sleeping under a standard 10 tog duvet. Results. All the subjects were too hot by 3 to 4°C. All showed changes in their EEG patterns with reduced REM sleep, increased awakenings, and all showed changes in their sleep stage patterns. In addition, they all showed evidence of increased sweating in the “heat-sink” area. Conclusions. The mechanisms where by such changes could be implicated in the precipitation and perpetuation of skin disease are discussed. “Lifestyle” modification as a very effective, noninvasive, therapeutic regime is recommended. Further research along these lines would probably be very valuable and instructive.  相似文献   
3.
The nation's policy on aging has not adequately addressed the disjuncture between the compelling increase in the number of aged and the changing family and social roles of women. There is a continuum of mid-life, aged and very old women engaged in inter-generational exchange of care, who have unmet needs both as care givers and care receivers. Shortcomings in public policy arrangements are discussed, along with proposals for a national policy on aging that focuses on the family as a caring unit.  相似文献   
4.
The techniques specific to peroperative fluorocholangiography are discussed based on an experience of 632 cholangiograms and an estimation has been made of the associated radiation doses to staff and patients. Rapid and accurate information can be obtained during fluorocholangiography using appropriate techniques with acceptably low radiation hazards.  相似文献   
5.
6.
7.
8.
Ten thrombocytopenic patients (platelets < 10–24 × 10(9)/L) who were refractory to platelet transfusion were investigated for their responsiveness to staphylococcal protein A column therapy. Nine patients had previously been treated with steroids, intravenous immune globulin, and/or other forms of immunosuppressive therapy without improvement in their transfusion response. All patients were receiving multiple platelet transfusions without achieving 1-hour corrected count increments (CCIs) > or = 7500. Eight patients had antibodies that reacted with platelets and were directed against HLA class I antigens, ABO antigens, and/or platelet-specific alloantigens. Plasma (500-2000 mL) from each patient was passed over a protein A silica gel column and then returned to the patient. Patients received from 1 to 14 treatments. A positive response to protein A therapy was defined as at least a doubling of the pretreatment platelet count and/or two successive 10- to 120-minute posttransfusion CCIs > or = 7500. Following plasma treatments, 6 of 10 patients responded with daily platelet counts that averaged 48 +/− 11 × 10(9) per L as compared with counts of 16 +/− 7 × 10(9) per L (p < 0.0005) before treatment. Posttransfusion CCI values determined in four of these patients averaged 2480 +/− 810 and 10,010 +/− 3540 (p < 0.005) before and after treatment, respectively. In contrast, among the four unresponsive patients, platelet counts averaged 10 +/− 9 and 13 +/− 10 × 10(9) per L (p = NS), respectively, while posttransfusion CCIs were 700 +/− 1410 and 1520 +/− 2460 (p = NS), respectively.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
9.
Medial border of the perirenal space: CT and anatomic correlation   总被引:11,自引:0,他引:11  
  相似文献   
10.
Central corneal endothelial cell loss was compared following primary insertion of folded posterior chamber silicone intraocular lenses (IOLs) in 29 eyes and Sinskey-style polymethylmethacrylate posterior chamber IOLs in 20 eyes. Cataracts were removed by phacoemulsification and sodium hyaluronate was used in all cases. The mean follow-up time was greater than seven months. The average cell loss was 9.6% and 10.9%, respectively. There was no significant difference in cell loss or visual results in the two groups. The amount of cell loss compares favorably with other series in which cell loss was determined following cataract surgery with and without IOL implantation.  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