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   4939篇
  免费   508篇
  国内免费   9篇
耳鼻咽喉   96篇
儿科学   123篇
妇产科学   115篇
基础医学   786篇
口腔科学   65篇
临床医学   678篇
内科学   964篇
皮肤病学   96篇
神经病学   392篇
特种医学   81篇
外科学   609篇
综合类   118篇
一般理论   8篇
预防医学   614篇
眼科学   89篇
药学   380篇
中国医学   4篇
肿瘤学   238篇
  2023年   43篇
  2022年   81篇
  2021年   184篇
  2020年   114篇
  2019年   171篇
  2018年   207篇
  2017年   125篇
  2016年   144篇
  2015年   150篇
  2014年   200篇
  2013年   231篇
  2012年   346篇
  2011年   371篇
  2010年   187篇
  2009年   169篇
  2008年   274篇
  2007年   233篇
  2006年   204篇
  2005年   207篇
  2004年   165篇
  2003年   139篇
  2002年   141篇
  2001年   68篇
  2000年   91篇
  1999年   76篇
  1998年   39篇
  1997年   26篇
  1996年   28篇
  1995年   30篇
  1993年   30篇
  1992年   50篇
  1991年   54篇
  1990年   54篇
  1989年   53篇
  1988年   59篇
  1987年   60篇
  1986年   69篇
  1985年   44篇
  1984年   48篇
  1983年   44篇
  1982年   23篇
  1981年   21篇
  1979年   29篇
  1978年   27篇
  1974年   21篇
  1972年   28篇
  1971年   21篇
  1970年   28篇
  1969年   24篇
  1967年   24篇
排序方式: 共有5456条查询结果,搜索用时 15 毫秒
51.
52.
Capillary malformations are slow-flow vascular malformations that affect the microcirculation including capillaries and post capillary venules and can be associated with growth differences. Specifically, the association of capillary malformations with undergrowth is a vastly understudied vascular syndrome with few reports of genetic causes including PIK3CA, GNAQ, and GNA11. Recently, a somatic pathogenic variant in AKT3 was identified in one child with a cutaneous vascular syndrome similar to cutis marmorata telangiectatica congenita, undergrowth, and no neurodevelopmental features. Here, we present a male patient with a capillary malformation and undergrowth due to a somatic pathogenic variant in AKT3 to confirm this association. It is essential to consider that mosaic pathogenic variants in AKT3 can cause a wide spectrum of disease. There is a need for future studies focusing on capillary malformations with undergrowth to understand the underlying mechanism.  相似文献   
53.
PURPOSE: To examine the relationship between stage of exercise adoption and the practice of other health behaviors. DESIGN: Demographic, socioeconomic, and health behavior data were collected using a cross-sectional mail survey. Data were collected as part of a larger employee benefits research study. SETTING: Montana State University-Bozeman, Bozeman, Montana. SUBJECTS: University employees (n = 1269) comprised of 46% men with a mean age of 44 years. MEASURES: Demographic and socioeconomic data included age, sex, marital status, level of income and education, dependent status, and job classification. Stage of exercise adoption classifications were based on self-reported responses to four exercise statements. The health behaviors included in this study were cigarette and smokeless tobacco use, seat belt use, alcohol use, and use of stress management practices. Logistic regression analysis was used to determine if stage of exercise predicted the presence of each of the health behaviors while controlling for demographic, socioeconomic, and other health behavior variables. RESULTS: The survey response rate was 68%. Respondents in action exercise stage (p = .0367) were less likely to smoke cigarettes than respondents in precontemplation stage of exercise. Respondents in contemplation (p = .0419), preparation (p = .0060), action (p = .0432), and maintenance (p = .0006) were more likely to use seat belts than respondents in precontemplation. Respondents in maintenance (p = .0059) were more likely to use regular stress reduction techniques than respondents in precontemplation. CONCLUSIONS: Although longitudinal research is needed to determine any causal relationships, this research suggests that encouraging individuals to become more involved in exercise could indirectly influence other health behaviors. Hence, exercise could be a possible "gateway" behavior toward healthier lifestyle practices.  相似文献   
54.
Control of intraocular pressure after trabeculectomy   总被引:3,自引:0,他引:3  
Control of intraocular pressure (IOP) is the goal of trabeculectomy, and pursuit of this goal does not end with the completion of the surgical procedure. Proper postoperative management of the trabeculectomy patient requires an understanding of possible events that alter IOP and knowledge of the treatments to control IOP. Recent changes in surgical technique, including the use of antimetabolites, have provided new challenges in the postoperative management of trabeculectomy patients. Interventions are described to restore the flow of aqueous to the filtering bleb in the early postoperative period, to manage flat anterior chambers with both high and low intraocular pressures, to manage a failing filtering bleb, and to manage hypotony. Herein we discuss current methods for controlling IOP in the postoperative period.  相似文献   
55.
Haynes BF  Hale LP 《Hospital practice (1995)》1999,34(3):59-60, 63-5, 69-70, passim
For the first time, physicians are challenged by clinical states in which the T-cell pool is destroyed postnatally in large numbers of patients. One such state is AIDS; another is the immune damage of cancer chemotherapy. Accordingly, study of postnatal thymic function is now a matter of clinical urgency. Ongoing work may point toward new strategies for repairing a damaged T-cell repertoire.  相似文献   
56.
PURPOSE: To report successful use of a combination of autologous blood injection and bleb compression sutures to treat overfiltration with hypotony maculopathy after trabeculectomy with mitomycin C. METHODS: Two patients underwent the combined procedure and were followed until visual acuity and intraocular pressure (IOP) were stable over three consecutive visits (4 to 9 months). RESULTS: Both patients experienced improvement in visual acuity both subjectively and objectively, and both patients had an elevation in IOP that persisted over three consecutive visits. CONCLUSIONS: Combination autologous blood injection and bleb compression suture placement may be an effective means of treating hypotony maculopathy after trabeculectomy with mitomycin C.  相似文献   
57.
58.
59.
Twenty-two women with unexplained heavy menstrual blood loss (average loss for two cycles of >80 ml) were treated with the prostaglandin synthetase inhibitor menfenamic acid during two consecutive menstruations. There was a significant reduction in menstrual blood loss on mefenamic acid therapy, the median loss being 137 ml before treatment and 76 ml while on treatment. Reduction in menstrual loss was achieved in 20 of the 22 patients but varied from a 2% to 78% reduction. The greater the menstrual loss before treatment, the more it was reduced on mefenamic acid therapy. Endometrial concentrations of prostaglandins E2 and F2 alpha in the follicular phase of the cycle were similar whether or not patients had menorrhagia. In the luteal phase, however, 6 of 14 patients with menorrhagia had higher endometrial prostaglandin E2 and F2 alpha concentrations than all 13 controls.  相似文献   
60.
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