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   189447篇
  免费   11541篇
  国内免费   485篇
耳鼻咽喉   2367篇
儿科学   6129篇
妇产科学   4144篇
基础医学   25749篇
口腔科学   8278篇
临床医学   14950篇
内科学   41716篇
皮肤病学   4757篇
神经病学   16243篇
特种医学   5675篇
外国民族医学   26篇
外科学   22893篇
综合类   1536篇
现状与发展   2篇
一般理论   78篇
预防医学   20229篇
眼科学   3581篇
药学   11611篇
中国医学   742篇
肿瘤学   10767篇
  2023年   942篇
  2022年   1713篇
  2021年   4137篇
  2020年   2751篇
  2019年   3937篇
  2018年   5447篇
  2017年   4005篇
  2016年   3821篇
  2015年   4515篇
  2014年   6139篇
  2013年   7971篇
  2012年   12175篇
  2011年   12705篇
  2010年   6506篇
  2009年   5802篇
  2008年   9936篇
  2007年   10495篇
  2006年   9853篇
  2005年   10065篇
  2004年   9462篇
  2003年   8680篇
  2002年   6689篇
  2001年   5186篇
  2000年   5124篇
  1999年   4546篇
  1998年   1724篇
  1997年   1444篇
  1996年   1415篇
  1995年   1217篇
  1994年   1162篇
  1993年   1081篇
  1992年   2752篇
  1991年   2657篇
  1990年   2408篇
  1989年   2406篇
  1988年   2190篇
  1987年   2000篇
  1986年   1876篇
  1985年   1810篇
  1984年   1318篇
  1983年   1060篇
  1982年   620篇
  1981年   563篇
  1980年   535篇
  1979年   949篇
  1978年   637篇
  1977年   498篇
  1975年   559篇
  1974年   550篇
  1973年   563篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Lesbian, gay, bisexual, transgender, queer and two-spirit plus (LGBTQ2S+) people have distinct healthcare needs that may be unaddressed in many undergraduate healthcare curricula. The Radiation Therapy Program (RADTH) at the University of Alberta underwent a review of the three-year didactic curriculum using an online survey. The survey sought to ascertain if, where and how topics related to LGBTQ2S + healthcare are taught. Results indicated that out of 10 RADTH program faculty respondents, three teach related topics. The total time dedicated within the three-year curriculum was approximately three and a half hours. Other findings showed that faculty are interested in receiving more education in this area and would favour discussions about how to incorporate these themes into appropriate courses. This preliminary investigation demonstrated that there has been some initial work in this area, but there is more to be done.  相似文献   
4.
5.
6.
Neorickettsia helminthoeca (NH), the agent of salmon poisoning disease or canine neorickettiosis (CN), is a bacterial endosymbiont of the nematode Nanophyetus salmincola, and infections are spreading among specific fish‐eating mammalians. This article describes the pathologic and immunohistochemical findings associated with spontaneous NH‐induced infections in dogs from Southern Brazil. The principal pathologic findings were hypertrophy of Peyer patches and lymphadenopathy with lymphocytic proliferation, chronic interstitial pneumonia, and chronic enteritis associated with positive intralesional immunoreactivity to antigens of NH within macrophages and histiocytes. Positive immunoreactivity against canine parvovirus‐2 (CPV‐2) or/and canine distemper virus was not detected in the evaluated intestinal segments or in the samples from the cerebellum and lungs, respectively, from the dogs evaluated. These findings demonstrated that NH was involved in the enteric, pulmonary, and lymphoid lesions herein described, and provide additional information to confirm the occurrence of this bacterial endosymbiont within this geographical location. It is proposed that chronic pneumonia should be considered as a pathologic manifestation of NH‐induced infections. Additionally, our results show that the occurrences of CN seem to be underdiagnosed in Southern Brazil due to the confusion with the incidence of CPV‐2.  相似文献   
7.

Objective

To examine whether a healthy weight intervention embedded in the Parents as Teachers (PAT) home visiting program, which was previously found to improve mothers’ body mass index (BMI) and obesity-related behaviors, changed the BMI of preschool children or maternal feeding practices.

Methods

This stratified randomized trial included preschool-aged children at risk for overweight whose mothers were overweight or had obesity (n?=?179). The Healthy Eating and Active Living Taught at Home (HEALTH) intervention was based on the Diabetes Prevention Program. Differences were examined using repeated-measures mixed-ANOVA models.

Results

Compared with PAT usual care, the HEALTH intervention had no effect on children's BMI or maternal feeding practices. However, combined analyses showed that children's BMI percentile decreased (P??=?.007), BMI z-scores were maintained (P??=?.19), and 3 of 8 feeding practices improved over time (P < .05).

Conclusions and Implications

Additional research is needed to assess the effectiveness of PAT to prevent preschool-age obesity using rigorous designs (eg, group-randomized trials) and to identify its active components. HEALTH is ready to be scaled up to prevent maternal weight gain through embedding within the national PAT program.  相似文献   
8.
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