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   32135篇
  免费   3810篇
  国内免费   442篇
耳鼻咽喉   1224篇
儿科学   1613篇
妇产科学   804篇
基础医学   2118篇
口腔科学   1410篇
临床医学   3328篇
内科学   6431篇
皮肤病学   1097篇
神经病学   2500篇
特种医学   1628篇
外国民族医学   2篇
外科学   7228篇
综合类   575篇
现状与发展   3篇
一般理论   7篇
预防医学   1711篇
眼科学   964篇
药学   1395篇
  4篇
中国医学   235篇
肿瘤学   2110篇
  2024年   117篇
  2023年   741篇
  2022年   474篇
  2021年   896篇
  2020年   1135篇
  2019年   695篇
  2018年   1339篇
  2017年   1238篇
  2016年   1525篇
  2015年   1413篇
  2014年   1897篇
  2013年   2258篇
  2012年   1797篇
  2011年   1770篇
  2010年   1495篇
  2009年   1419篇
  2008年   1508篇
  2007年   1428篇
  2006年   1520篇
  2005年   1365篇
  2004年   1388篇
  2003年   1326篇
  2002年   1205篇
  2001年   900篇
  2000年   817篇
  1999年   633篇
  1998年   432篇
  1997年   407篇
  1996年   433篇
  1995年   347篇
  1994年   241篇
  1993年   176篇
  1992年   183篇
  1991年   184篇
  1990年   103篇
  1989年   175篇
  1988年   137篇
  1987年   106篇
  1986年   118篇
  1985年   108篇
  1984年   104篇
  1983年   80篇
  1982年   89篇
  1981年   60篇
  1980年   64篇
  1979年   49篇
  1978年   56篇
  1977年   55篇
  1975年   48篇
  1972年   43篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  相似文献   
4.
5.
6.
7.
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   
8.
The cingulum, connecting the orbitofrontal cortex to the medial temporal lobe, involves in diverse cognition functions including attention, memory, and motivation. To investigate the relationship between the cingulum injury and cognitive impairment in patients with chronic mild traumatic brain injury, we evaluated the integrity between the anterior cingulum and the basal forebrain using diffusion tensor tractography in 73 patients with chronic mild traumatic brain injury(39 males, 34 females, age 43.29 ± 11.42 years) and40 healthy controls(22 males, 18 females, age 40.11 ± 16.81 years). The patients were divided into three subgroups based on the integrity between the anterior cingulum and the basal forebrain on diffusion tensor tractography: subgroup A(n = 19 patients)-both sides of the anterior cingulum were intact; subgroup B(n= 36 patients)-either side of the anterior cingulum was intact; and subgroup C(18 patients)-both sides of the anterior cingulum were discontinued. There were significant differences in total Memory Assessment Scale score between subgroups A and B and between subgroups A and C. There were no significant differences in diffusion tensor tractography parameters(fractional anisotropy, apparent diffusion coefficient, and fiber volume) between patients and controls. These findings suggest that the integrity between the anterior cingulum and the basal forebrain, but not diffusion tensor tractography parameter, can be used to predict the cognitive function of patients with chronic mild traumatic brain injury. This study was approved by Yeungnam University Hospital Institutional Review Board(approval No. YUMC-2014-01-425-010) on August 16, 2017.  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