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   1442826篇
  免费   114951篇
  国内免费   3406篇
耳鼻咽喉   18683篇
儿科学   47434篇
妇产科学   41666篇
基础医学   205651篇
口腔科学   38033篇
临床医学   128998篇
内科学   291811篇
皮肤病学   33945篇
神经病学   119951篇
特种医学   54762篇
外国民族医学   493篇
外科学   214513篇
综合类   32840篇
现状与发展   3篇
一般理论   493篇
预防医学   112374篇
眼科学   32022篇
药学   100705篇
  1篇
中国医学   3412篇
肿瘤学   83393篇
  2021年   11350篇
  2019年   12197篇
  2018年   17466篇
  2017年   13296篇
  2016年   14873篇
  2015年   16783篇
  2014年   23431篇
  2013年   34669篇
  2012年   47576篇
  2011年   50147篇
  2010年   29286篇
  2009年   27967篇
  2008年   46335篇
  2007年   48872篇
  2006年   49306篇
  2005年   47894篇
  2004年   45722篇
  2003年   43499篇
  2002年   41954篇
  2001年   73646篇
  2000年   75204篇
  1999年   62103篇
  1998年   17170篇
  1997年   15572篇
  1996年   15716篇
  1995年   14913篇
  1994年   13510篇
  1993年   12680篇
  1992年   46176篇
  1991年   43793篇
  1990年   41828篇
  1989年   39833篇
  1988年   36446篇
  1987年   35621篇
  1986年   33109篇
  1985年   31518篇
  1984年   23991篇
  1983年   20170篇
  1982年   12292篇
  1981年   10852篇
  1979年   20826篇
  1978年   14655篇
  1977年   12162篇
  1976年   11444篇
  1975年   11687篇
  1974年   14081篇
  1973年   13621篇
  1972年   12723篇
  1971年   11557篇
  1970年   10993篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Hawi  N.  von Falck  C.  Krettek  C.  Meller  R. 《Der Unfallchirurg》2019,122(12):944-949
Die Unfallchirurgie - Zur Diagnostik von Schultergelenkerkrankungen wird routinemäßig die Magnetresonanztomographie (MRT) durchgeführt. Diese kann entsprechend der klinischen...  相似文献   
92.
BackgroundWomen suffering from kidney disease are more prone to fertility problems, due to uremia. Fortunately, their fertility rate increases dramatically after renal transplantation. This study analyzes the predictors/risk factors of successful pregnancy with live birth outcome while presenting an overview of the 7-year experience of a single center.MethodsThis retrospective cohort study includes 239 women of reproductive age (18–40 years) who underwent renal transplantation in a tertiary Turkish clinic between October 1, 2011, and August 24, 2017. The subjects were invited to take part in a survey questioning their obstetric characteristics and they were assessed in 2 groups: fertile and infertile. Multivariable linear regression analysis was conducted to determine the predictors of a successful pregnancy.ResultsThirty-five 35 patients wished to become pregnant: 12 got pregnant spontaneously, while 21 failed to become pregnant (spontaneously). The mean age of the patients at the survey was 34 ± 7. Regular menstrual cycles after renal transplantation, tacrolimus-mycophenolate mofetil maintenance protocol, and age at transplantation were found to be predictors of spontaneous pregnancy. The duration of peritoneal dialysis was significantly longer in the infertile group (48 vs 12 months).ConclusionEnd-stage renal disease's negative impacts, including menstrual abnormality and fertility problems, can be overcome by successful kidney transplantation with appropriate immunosuppression. Minimizing the duration of peritoneal dialysis, particularly in patients who desire future fertility, may be accepted as a logical management strategy.  相似文献   
93.
94.
95.
96.
97.
98.
99.
Objectives: There is a paucity of reporting on surgical outcomes of isolated posterior cruciate ligament reconstruction (PCLR). We hypothesize that isolated PCL injuries failing nonoperative treatment achieve good outcomes and are able to return to sport following PCLR.

Methods: A retrospective analysis was performed to identify patients with isolated PCL injuries that underwent reconstruction between 2001 and 2014. Patients with multi-ligamentous injury or another concomitant knee pathology were excluded. Medical records were reviewed for demographic, clinical and operative data. Patients were contacted for administration of a telephone-based questionnaire which included the International Knee Documentation Committee (IKDC) Subjective Knee Evaluation form, Lysholm-Tegner scales, Marx activity scale (MAS), return to sport status, and patient satisfaction instruments.

Results: A total of 15 isolated PCL reconstructions in 14 patients with a mean age of 27.5 years (range 17–43) met the study inclusion criteria; mean follow up was 6.3 years (range 1.4–15.2). Pre-operatively, the primary complaint was knee instability in all patients; on physical examination, lack of a firm end point during posterior drawer testing was found in 93% (14/15) of the knees. In total, 12 of 15 knees underwent transtibial, single-bundle PCLR and three of 15 underwent tibial inlay, double bundle PCLR. Graft types included: quadriceps autograft (7/15), Achilles allograft (6/15), and hamstring autograft (2/15). There were no graft failures in our patient cohort. At most recent follow up the mean scores respectively on the IKDC form, Lysholm-Tegner scales and MAS were (standard deviation): 77.3 (16.5), 83.1 (17.9), 6.13 (2.6), and 7.1 (6.0). All fourteen patients were athletes prior to their injury and 79% (11/14) returned to sport and overall patient satisfaction was 9.2/10.

Conclusions: Isolated PCLR provides good outcomes at mean medium-term follow up with restoration of function, high rate of return to sport and overall patient satisfaction.  相似文献   

100.
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