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   537708篇
  免费   28035篇
  国内免费   514篇
耳鼻咽喉   6789篇
儿科学   17052篇
妇产科学   12652篇
基础医学   93637篇
口腔科学   12903篇
临床医学   49015篇
内科学   96851篇
皮肤病学   12019篇
神经病学   34683篇
特种医学   19925篇
外国民族医学   53篇
外科学   79076篇
综合类   7622篇
现状与发展   2篇
一般理论   109篇
预防医学   39622篇
眼科学   12064篇
药学   42121篇
  1篇
中国医学   1201篇
肿瘤学   28860篇
  2021年   4073篇
  2019年   4090篇
  2018年   6003篇
  2017年   4313篇
  2016年   5099篇
  2015年   5546篇
  2014年   7378篇
  2013年   10925篇
  2012年   16189篇
  2011年   18117篇
  2010年   10333篇
  2009年   9057篇
  2008年   16214篇
  2007年   17963篇
  2006年   17421篇
  2005年   16688篇
  2004年   16279篇
  2003年   15598篇
  2002年   15075篇
  2001年   22545篇
  2000年   23133篇
  1999年   19036篇
  1998年   5259篇
  1997年   4403篇
  1996年   4421篇
  1995年   4140篇
  1992年   14447篇
  1991年   15852篇
  1990年   15984篇
  1989年   15653篇
  1988年   14326篇
  1987年   14217篇
  1986年   13179篇
  1985年   12705篇
  1984年   9404篇
  1983年   8010篇
  1982年   4184篇
  1979年   8950篇
  1978年   6394篇
  1977年   5159篇
  1976年   5512篇
  1975年   6622篇
  1974年   7429篇
  1973年   7164篇
  1972年   6601篇
  1971年   6312篇
  1970年   5891篇
  1969年   5469篇
  1968年   5162篇
  1967年   4629篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
953.
The aim of the study was to assess both p27 and p53 expression in the stromal and epithelial component of carcinosarcoma and to assess if their expression in the latter is different than in endometrial carcinoma. Immunohistochemical staining for p27 and p53 was performed on paraffin-embedded tissue blocks of 18 uterine specimens with carcinosarcoma and their expression assessed. Their expression in the epithelial element was also compared to that in 35 paraffin-embedded tissue blocks of endometrial endometrioid carcinoma. Reduced p27 expression was observed in a similarly high proportion of the stromal (77.8%) as well as of the epithelial component (66.7%) of carcinosarcoma. Although statistically not significant, the proportion of reduced p27 expression in endometrial carcinoma (85.7%) was higher than in the epithelial element of carcinosarcoma. The percentage of p53 overexpression in both elements of carcinosarcomas and in endometrial carcinomas was low and also similar (27.8 and 20.0%, respectively). Our results indicate that reduced p27 expression is common and p53 overexpression is infrequent in carcinosarcoma. Their similar rates of expression in the stromal and epithelial elements of the tumor support the contention of a monoclonal origin of carcinosarcoma. Unexpectedly, reduced p27 expression is more common in endometrial carcinoma than in the epithelial element of carcinosarcoma, in spite of the less favorable prognosticators and outcome in the latter. Further studies of p27 expression in carcinosarcoma are indicated to establish its clinical value in this aggressive malignancy.  相似文献   
954.
955.
The worldwide shortage of organs for transplantation makes it important to understand why some oppose donation. Attitudes vary with religion and ethnicity. Accordingly, we undertook a qualitative study of the attitudes of 141 U.K. Muslim Indo-Asians to organ donation. Participants were observed, focus group discussions held and in-depth individual interviews conducted. We identified a high level of alienation from the health care system in general. With respect to organ donation in particular, its importance was generally discounted, often in deference to authority figures within the community who appeared negatively disposed. The culture-specific issues arguing against donation included a sense of the sacredness of the body, a fatalistic approach to illness, a belief that organs took on an independent role as 'witnesses' to an individual's life on Judgement Day and an anxiety that the donor would have no control of the probity of the recipient of an organ. We believe these data suggest a need to improve in a culturally sensitive fashion the provision of health information provided to this community.  相似文献   
956.
957.
958.
959.
We report the case of a 49-year-old patient, with recent onset of fatigue, who was diagnosed with atrial fibrillation, which was cardioverted electrically. A diagnosis of right atrial aneurysm, with no other cardiac pathology, was made. An aneurysmectomy was performed. Both surgery and postoperative recovery were uneventful.  相似文献   
960.
The aim of this work was to evaluate NMR cerebellar abnormalities in children with severe acute ataxia. Among 8 consecutively observed children, NMR performed in 6 during the acute phase was pathological in 4, demonstrating hyperintense signal in the T2-weighed sequences of dentate nuclei (2 cases, associated in 1 with hyperintense signal in the medium cerebellar peduncle) or of the cerebellar cortex associated with cerebellar swelling (2 cases). NMR performed in 7 cases after at least 1 month of evolution showed cerebellar atrophy in 4 cases. After 1 to 6 years of clinical follow-up, 4/8 children had clinical sequellae, including 3 of the 4 children with initially abnormal NMR. Conversely, the 2 patients with initially normal NMR had a good clinical recovery. NMR during the acute phase gives informations on prognosis in patients with severe acute 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