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   194031篇
  免费   2175篇
  国内免费   62篇
耳鼻咽喉   1448篇
儿科学   7630篇
妇产科学   3467篇
基础医学   18087篇
口腔科学   1878篇
临床医学   13814篇
内科学   35239篇
皮肤病学   975篇
神经病学   17335篇
特种医学   9582篇
外科学   32231篇
综合类   2773篇
一般理论   3篇
预防医学   19048篇
眼科学   3614篇
药学   10881篇
  2篇
中国医学   695篇
肿瘤学   17566篇
  2023年   167篇
  2022年   340篇
  2021年   775篇
  2020年   406篇
  2019年   616篇
  2018年   22498篇
  2017年   17760篇
  2016年   19890篇
  2015年   1376篇
  2014年   1542篇
  2013年   1698篇
  2012年   8336篇
  2011年   22180篇
  2010年   19525篇
  2009年   12092篇
  2008年   20378篇
  2007年   22581篇
  2006年   1397篇
  2005年   2952篇
  2004年   4073篇
  2003年   4928篇
  2002年   3008篇
  2001年   732篇
  2000年   906篇
  1999年   552篇
  1998年   353篇
  1997年   333篇
  1996年   201篇
  1995年   212篇
  1994年   196篇
  1993年   137篇
  1992年   313篇
  1991年   331篇
  1990年   339篇
  1989年   284篇
  1988年   222篇
  1987年   213篇
  1986年   176篇
  1985年   196篇
  1984年   165篇
  1983年   161篇
  1982年   89篇
  1981年   76篇
  1980年   100篇
  1979年   118篇
  1978年   94篇
  1974年   94篇
  1973年   111篇
  1972年   100篇
  1970年   77篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Contemporary discourse contains numerous examples of use of the concept of culture by social and behavioral scientists. Simple reification, where the speaker makes culture into a thing capable of action exemplifies one usage in public discourse. Some quantitative social scientists attempt to characterize people’s cultural identities by means of a single categorical variable, which often “lumps” people into categories such as “Hispanic” or “Black” that in fact have numerous culturally bounded subcategories. Approaches that emphasize cultural process are preferable to those who attempt to categorize; more complex measures of acculturation help investigators to make convincing analyses of circumstances in which health disparities occur. Examples in which investigators make appropriate use of cultural characterizations demonstrate their utility in investigating health disparities in Haitian American women, injecting and noninjecting drug users, Hispanic youth, and adult Hispanics at risk of HIV infection. Focus on culture in the study of health disparities can identify entanglements between structural factors such as poverty and lack of education and cultural factors such as beliefs about health. Qualitative methods coupled with quantitative methods have great potential to improve investigators’ grasp of cultural nuance while capturing the distribution of qualitatively derived behaviors.  相似文献   
52.
The authors describe the use of photodynamic therapy with verteporfin for subfoveal choroidal neovascular membrane secondary to optic nerve drusen. A 28-year-old woman had a peripapillary choroidal neovascular membrane secondary to optic nerve drusen with significant metamorphopsia. Photodynamic therapy using verteporfin was performed. Visual acuity improved to 20/20 with resolution of metamorphopsia and absence of leakage on fluorescein angiography a few weeks after verteporfin therapy. The patient's condition remained stable for 16 months with 20/20 vision. Photodynamic therapy with verteporfin may be a useful treatment option in patients with choroidal neovascular membranes secondary to optic nerve drusen.  相似文献   
53.
54.
55.
The specific characteristics of genetic data lead to ethical-legal conflicts in the framework of genetic diagnosis. Several international organisations, including UNESCO and the Council of Europe, have enacted rules referring to the use of genetic information. This paper discusses possible legal and ethical criteria that could be used in genetic testing.  相似文献   
56.
57.
58.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
59.
60.
We report an unusual case of sporadic adult onset cerebellar ataxia with hypogonadism. A 40-year-old unmarried man presented with progressive ataxia and dysarthria along with complaints of non-development of secondary sexual characteristics and erectile dysfunction. There were complaints of intermittent diarrhea. Clinical examination revealed a pan-cerebellar syndrome with features of hypoandrogenism. No eye movement abnormalities were evident. There were signs of malabsorption. Investigations confirmed the presence of auto-antibodies found in celiac disease, and a duodenal biopsy confirmed the same. Hypoandrogenism was postulated to be due to hypergonadotropic hypogonadism which has been mentioned in a few patients of celiac disease. However, the pattern seen in our patient was of a hypogonadotropic hypogonadism. This is probably secondary to an autoimmune hypophysitis seen in some patients in the absence of other clinical manifestations. Autoantibody testing should be a diagnostic necessity in any adult with a sporadic cerebellar ataxia.  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