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   28619篇
  免费   2381篇
  国内免费   95篇
耳鼻咽喉   200篇
儿科学   926篇
妇产科学   633篇
基础医学   4411篇
口腔科学   467篇
临床医学   3380篇
内科学   6016篇
皮肤病学   548篇
神经病学   3057篇
特种医学   681篇
外科学   2622篇
综合类   266篇
一般理论   33篇
预防医学   3061篇
眼科学   441篇
药学   2102篇
中国医学   44篇
肿瘤学   2207篇
  2023年   216篇
  2022年   368篇
  2021年   842篇
  2020年   541篇
  2019年   823篇
  2018年   858篇
  2017年   643篇
  2016年   718篇
  2015年   792篇
  2014年   1010篇
  2013年   1399篇
  2012年   2176篇
  2011年   2172篇
  2010年   1184篇
  2009年   1015篇
  2008年   1746篇
  2007年   1804篇
  2006年   1788篇
  2005年   1740篇
  2004年   1598篇
  2003年   1428篇
  2002年   1254篇
  2001年   345篇
  2000年   317篇
  1999年   353篇
  1998年   270篇
  1997年   203篇
  1996年   218篇
  1995年   189篇
  1994年   144篇
  1993年   152篇
  1992年   208篇
  1991年   181篇
  1990年   170篇
  1989年   170篇
  1988年   150篇
  1987年   144篇
  1986年   134篇
  1985年   146篇
  1984年   135篇
  1983年   118篇
  1982年   69篇
  1981年   72篇
  1980年   77篇
  1979年   103篇
  1978年   65篇
  1977年   63篇
  1974年   65篇
  1973年   75篇
  1971年   64篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
21.
Prisons and prison inmates present important targets for HIV/AIDS prevention interventions. Inmates often have histories of high-risk behavior that place them in danger of contracting HIV/AIDS, and rates of HIV/AIDS tend to be much higher in this population. The goal of this study was to assess the effectiveness of a prison-based HIV/AIDS intervention to change attitudes toward HIV prevention, norms supporting HIV prevention, perceived behavioral control (i.e., self-efficacy) for HIV prevention behaviors, and intentions to engage in HIV prevention behaviors postrelease. The intervention also had the goal of encouraging inmates to become HIV/AIDS peer educators. The intervention appeared most successful at influencing beliefs and behaviors related to peer education and somewhat successful at influencing beliefs and intentions related to condom use. Analyses also showed some significant differences in effectiveness by race/ethnicity. Results are discussed from the perspectives of both research and practice with regard to prison-based HIV prevention efforts.  相似文献   
22.
23.
24.
Direct vascular injury after primary total knee arthroplasty is rare. This case report illustrates a 65-year-old female who was diagnosed with a pseudoaneurysm of the popliteal artery when she was investigated for increased leg swelling and pain 1 week after total knee arthroplasty. She had a percutaneous endovascular repair with a stent after thrombectomy.  相似文献   
25.
26.
27.
Two new T cell subsets may be involved in allergic rhinitis (AR) pathogenesis: Th17 and T regulatory cells, mainly producing IL-17 and TGF-β respectively. Successful Sublingual Immunotherapy (SLIT) induces relevant immunological changes, thus the aim of this study was to evaluate serum IL-17 and TGF-β levels in AR patients treated with SLIT for 2 years. Patients' blood samples were collected before initiating SLIT (baseline), three months after the end of the first pre-seasonal SLIT course, and at the end of the second pre-seasonal course. IL-17 was detectable only in the most severe allergic patients. SLIT significantly induced an increase in serum TGF-β levels. There was moreover a significant relationship between TGF-β and symptom severity and drug use at the end of the study. Therefore, this study provides clinically relevant evidence that two pre-seasonal SLIT courses may significantly affect serum TGF-β levels.  相似文献   
28.
29.
Sixty children aged 5-13 years with moderately severe asthma took part in a double-blind, placebo-controlled trial of ketotifen. The design incorporated a 22 week study period, the addition of ketotifen or placebo to the current medication, and a controlled withdrawal of the regular therapy. Children receiving ketotifen showed significantly lower mean numbers of asthma attacks and less absence from school. The addition of ketotifen to existing treatment was associated with marginally significant changes in rates of day and night wheezing. In the second phase of study, additional therapy was withdrawn from both the ketotifen and placebo groups which resulted in a high (percentage) withdrawal. Children receiving ketotifen did not have a significantly lower failure rate than those given placebo.  相似文献   
30.
Forty consecutive adult patients under the age of 50 with acute non-lymphoblastic leukemia (ANLL) in first complete remission, underwent autologous bone marrow transplantation (ABMT) between March 1984 and April 1990. The conditioning regimen employed included cyclophosphamide and total body irradiation, followed by the administration of unpurged ABMT. The median time from diagnosis to transplant was 7 months (3-15 months), and the median time from complete remission to ABMT was 4 months (range 3-9 months). Twenty-two (51%) patients remain in complete remission 6-81 months (median 24 months) after ABMT.

The causes of death were, recurrent leukemia (11 patients), parenchymal toxicities such as acute respiratory distress syndrome and veno-occlusive disease (3 patients), hemorrhage (2 patients) and infection (2 patients). Eleven patients relapsed after 3-12 months (median 5 months). This study has produced survival data comparable to those of other institutions employing TBI for either allo or autotransplants.  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