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   992篇
  免费   53篇
  国内免费   105篇
耳鼻咽喉   16篇
儿科学   41篇
妇产科学   25篇
基础医学   89篇
口腔科学   57篇
临床医学   161篇
内科学   215篇
皮肤病学   40篇
神经病学   20篇
特种医学   77篇
外科学   170篇
综合类   62篇
预防医学   45篇
眼科学   12篇
药学   86篇
中国医学   1篇
肿瘤学   33篇
  2017年   8篇
  2015年   11篇
  2013年   18篇
  2012年   9篇
  2011年   14篇
  2010年   22篇
  2009年   20篇
  2008年   8篇
  2007年   60篇
  2006年   14篇
  2005年   26篇
  2004年   12篇
  2003年   10篇
  2002年   12篇
  2000年   11篇
  1999年   11篇
  1998年   54篇
  1997年   47篇
  1996年   53篇
  1995年   29篇
  1994年   31篇
  1993年   33篇
  1992年   19篇
  1991年   11篇
  1990年   19篇
  1989年   23篇
  1988年   24篇
  1987年   25篇
  1986年   28篇
  1985年   19篇
  1984年   7篇
  1983年   7篇
  1982年   7篇
  1981年   10篇
  1980年   13篇
  1979年   8篇
  1978年   7篇
  1977年   8篇
  1976年   13篇
  1975年   10篇
  1964年   7篇
  1963年   17篇
  1959年   26篇
  1958年   44篇
  1957年   48篇
  1956年   48篇
  1955年   41篇
  1954年   35篇
  1949年   15篇
  1948年   21篇
排序方式: 共有1150条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
The significance of white blood cells in the ejaculate remains a matter of controversy. Several authors have suggested that such cells are important in the modulation of an antisperm antibody response, i.e. a predominance of suppressor/cytotoxic to helper/inducer T cells may prevent the development of antisperm antibodies. In order to examine this relationship further we have documented the white blood cell types, with emphasis on the T-lymphocyte populations, in the ejaculates of men from infertile couples with and without antisperm antibodies; the latter group was divided further into two groups--vasovasostomized men and idiopathic men. All seven of the men without antisperm antibodies had a predominance of suppressor/cytotoxic T cells to helper/inducer T cells in the ejaculate. However, only in some of the men with antibodies was there a predominance of T-helper/inducer cells. It is clear that the relationship between antisperm antibodies and seminal leucocytes is therefore not as straightforward as has been proposed.  相似文献   
5.
1. The present study aimed to determine the feasibility of conducting a 5 year cardiovascular outcome trial of the treatment of 6000 elderly hypertensive patients in Australian general practices. 2. General practitioners (GPs) were invited to participate by mail and personal follow-up. Patient records were reviewed to identify subjects for a blood pressure (BP) screening programme. Blood pressure was measured on three occasions and eligible subjects were included if the average BP was 160 mmHg systolic or 90 mmHg diastolic if systolic BP was 140 mmHg. 3. Seven hundred and forty-one GPs were approached and 89 were enrolled in the study (12% of mail invites and 75% of those receiving a personal contact). In 16 practices where screening was completed, 82 000 records were reviewed to identify 4% patients eligible for screening. Twenty-two per cent of eligible subjects attended screening. Of 1938 subjects screened, 180 (9%) had BP 5=160/90 mmHg. Forty-seven percent of subjects (n = 916) were receiving antihypertensive therapy and 184 (20%) were withdrawn from therapy. One hundred and sixteen (63%) of these subjects had BP return to study entry levels within 6 weeks. Fifty-seven newly diagnosed and 81 previously treated subjects were randomized (7% of the screened population). 4. Based on the high participation rate of GPs, the response rate of patients to attend a BP screening programme and the 7% randomization to screening ratio for entry into the study, the ANBP2 pilot study has demonstrated that it is feasible to recruit subjects from Australian general practices to a cardiovascular outcome trial.  相似文献   
6.
Medical patients (N = 108) were administered a brief screeninginstrument (LAMSI) and a structured diagnostic interview (SUDDS).Twenty-five patients met DSM-III criteria for an alcohol usedisorder, 20 current, five in remission. The four-item scaleembedded in the screen identified the alcoholics with 88% sensitivityand 96% specificity.  相似文献   
7.
8.
ABSTRACT. Two atypical cases of colitis due to cow's milk protein intolerance (CMPI) are reported, affecting preterm infants. One developed a toxic dilatation of the colon and responded well to a casein hydrolysate based feed. The second presented insidiously and failed to tolerate a casein hydrolysate, but responded well to a chicken-based modular feed.  相似文献   
9.
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