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   8812篇
  免费   888篇
  国内免费   26篇
耳鼻咽喉   29篇
儿科学   403篇
妇产科学   189篇
基础医学   1293篇
口腔科学   131篇
临床医学   1117篇
内科学   1778篇
皮肤病学   122篇
神经病学   613篇
特种医学   819篇
外科学   983篇
综合类   176篇
一般理论   10篇
预防医学   837篇
眼科学   178篇
药学   572篇
中国医学   5篇
肿瘤学   471篇
  2021年   95篇
  2020年   69篇
  2019年   110篇
  2018年   130篇
  2017年   105篇
  2016年   135篇
  2015年   132篇
  2014年   178篇
  2013年   272篇
  2012年   364篇
  2011年   350篇
  2010年   270篇
  2009年   214篇
  2008年   371篇
  2007年   395篇
  2006年   377篇
  2005年   337篇
  2004年   318篇
  2003年   282篇
  2002年   261篇
  2001年   251篇
  2000年   254篇
  1999年   234篇
  1998年   231篇
  1997年   193篇
  1996年   200篇
  1995年   154篇
  1994年   149篇
  1993年   128篇
  1992年   203篇
  1991年   194篇
  1990年   188篇
  1989年   227篇
  1988年   184篇
  1987年   193篇
  1986年   188篇
  1985年   190篇
  1984年   88篇
  1983年   127篇
  1982年   88篇
  1981年   71篇
  1980年   101篇
  1979年   96篇
  1978年   68篇
  1977年   78篇
  1976年   94篇
  1975年   93篇
  1974年   70篇
  1973年   80篇
  1972年   59篇
排序方式: 共有9726条查询结果,搜索用时 15 毫秒
31.
32.
Two patients with carcinoma of the penis were treated with interstitial radiation. They were cured of their disease for 17 and 21 years respectively and then developed radiation-induced tumours.  相似文献   
33.
Paragangliomas are neuroendocrine tumours and those occurring in the head and neck have well recognized familial association. Retroperitoneal paragangliomas are uncommon and we present two cases of familial malignant retroperitoneal paraganglioma. Review of the literature revealed marked differences in the incidence and malignant potential of familial and non-familial paraganglioma. In contrast to the cases reported here, familial tumours are generally benign, though they may occur at multiple sites. Familial and non-familial paragangliomas may indeed be different disease entities.  相似文献   
34.
The susceptibility of urinary tract Escherichia coli isolates to cotrimoxazole, sulphonamide, trimethoprim, and ampicillin was monitored over an 11-year period. A trend in increasing resistance to cotrimoxazole and trimethoprim was observed, but there was no comparable alteration in sulphonamide resistance. Ampicillin resistance was high at the beginning of the survey period and continued to rise.  相似文献   
35.
36.
37.
There is evidence that cervical adenocarcinoma is increasing in incidence, particularly in young women. In order to assess the possible role of human papillomaviruses in cervical glandular oncogenesis, 16 cases of invasive adenocarcinoma and eight cases of adenocarcinoma in situ have been examined by in situ DNA hybridization using biotinylated probes to human papillomavirus types 6, 11, 16, 18, and 31, and assessed by polymerase chain reaction analysis for human papillomavirus types 11, 16, and 18 sequences. Of the invasive adenocarcinomas, four of 16 contained human papillomavirus type 16 sequences and one of 16 contained type 18 sequences as assessed by polymerase chain reaction analysis. Five of eight cases of adenocarcinoma in situ contained human papillomavirus type 16 sequences by polymerase chain reaction analysis. Only one invasive adenocarcinoma and one case of adenocarcinoma in situ showed a positive in situ hybridization signal. The low rate of carriage of the human papillomavirus sequences examined suggests that these viral types may not play a major role in cervical glandular neoplasia.  相似文献   
38.
39.
We describe the functioning and well-being of patients with depression, relative to patients with chronic medical conditions or no chronic conditions. Data are from 11,242 outpatients in three health care provision systems in three US sites. Patients with either current depressive disorder or depressive symptoms in the absence of disorder tended to have worse physical, social, and role functioning, worse perceived current health, and greater bodily pain than did patients with no chronic conditions. The poor functioning uniquely associated with depressive symptoms, with or without depressive disorder, was comparable with or worse than that uniquely associated with eight major chronic medical conditions. For example, the unique association of days in bed with depressive symptoms was significantly greater than the comparable association with hypertension, diabetes, and arthritis. Depression and chronic medical conditions had unique and additive effects on patient functioning.  相似文献   
40.
OBJECTIVE--It was hypothesised that the endometrium might act as a reservoir for candida, thus infecting the vagina as the endometrium is shed during menstruation. DESIGN--A prospective study of women with recurrent vulvo-vaginal candidiasis. The endometrium was sampled and cultured for candida species. SETTING--Central London STD clinic. SUBJECTS--26 women were enrolled, of whom 20 completed the study. RESULTS--One patient had a positive endometrial culture for candida species, the isolate being Candida krusei. CONCLUSIONS--The endometrium is not a common resevoir for candida species and therefore, infection at this site is an unlikely cause of recurrent vaginal candidiasis.  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