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   3520751篇
  免费   266721篇
  国内免费   6878篇
耳鼻咽喉   49733篇
儿科学   112114篇
妇产科学   94658篇
基础医学   495686篇
口腔科学   103119篇
临床医学   320713篇
内科学   681204篇
皮肤病学   74894篇
神经病学   286190篇
特种医学   136550篇
外国民族医学   1084篇
外科学   531055篇
综合类   83993篇
现状与发展   5篇
一般理论   1394篇
预防医学   278429篇
眼科学   84216篇
药学   262378篇
  11篇
中国医学   7485篇
肿瘤学   189439篇
  2018年   37568篇
  2017年   28716篇
  2016年   31765篇
  2015年   35996篇
  2014年   51158篇
  2013年   76921篇
  2012年   104751篇
  2011年   110733篇
  2010年   65581篇
  2009年   61940篇
  2008年   104119篇
  2007年   110911篇
  2006年   111864篇
  2005年   108518篇
  2004年   104544篇
  2003年   100304篇
  2002年   98094篇
  2001年   166754篇
  2000年   172007篇
  1999年   144795篇
  1998年   41123篇
  1997年   36679篇
  1996年   36343篇
  1995年   35161篇
  1994年   32822篇
  1993年   30424篇
  1992年   114834篇
  1991年   111169篇
  1990年   107272篇
  1989年   103617篇
  1988年   95684篇
  1987年   93982篇
  1986年   88846篇
  1985年   84752篇
  1984年   63812篇
  1983年   54376篇
  1982年   32215篇
  1981年   28770篇
  1979年   58790篇
  1978年   41064篇
  1977年   34890篇
  1976年   32650篇
  1975年   34467篇
  1974年   42421篇
  1973年   40474篇
  1972年   37889篇
  1971年   34987篇
  1970年   32871篇
  1969年   30587篇
  1968年   28086篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
Western transfer and immunoenzymatic staining with affinity-purified monospecific antiserum was used to detect a 38-Kd protein that bound to native and denatured DNA cellulose. This protein has previously been shown to be a delayed early herpes simplex virus type-2 specific protein.  相似文献   
942.
943.
4260 conjunctival specimens of 2850 outpatients with keratoconjunctivitis of presumed infectious etiology were studied. Two thousand six hundred sixty-eight specimens (63%) revealed growth of bacteria, and 80 (2%) growth of fungi. One hundred ninety-nine specimens (5%) were McCoy cell culture or direct stain (monoclonal antibody or Giemsa) positive for Chlamydia trachomatis. two patients had a C. psittaci infection (ELISA techniques). In patients with keratoconjunctivitis of bacterial etiology, overall incidence of McCoy cell culture-proven chlamydial infections was 7%; in the 20 to 30-year age group it was 12.5%. Simultaneous infections of chlamydiae and other bacteria were seen in 34 patients. Since sensitive and specific tests to diagnose chlamydial infections are available, ophthalmologists may be able to prevent these infections by agent-specific antibiotic therapy.  相似文献   
944.
The Brief Symptom Inventory (BSI), a 53-item psychiatric symptom checklist, was administered to 57 alcoholic inpatients on days 2, 10, 18 and 26 of their 28-day stay in an alcoholism rehabilitation unit at a Veterans Administration hospital. The results of the test show a steady decline in the patients' psychiatric symptomatology from week 1 to week 4 with the most dramatic improvement evidenced between weeks 1 and 2.  相似文献   
945.
946.
The authors have presented the results of a 14-day open randomized trial of the efficacy of 3 calcium inlet blocking agents: nifedipine, verapamil and phendilin in 61 patients with Raynaud's syndrome. In the group of patients receiving 30-80 mg of nifedipine (20) there was a significant decrease in the frequency and expression of Raynaud's syndrome attacks, a positive effect of varying degree was noted in 19 patients. The drug raised slightly the skin and muscular blood flow and skin temperature. The use of 120-360 mg of verapamil in 21 patients caused no significant inhibition of Raynaud's syndrome and rise of hemocirculation. Phendilin (150-300 mg) though being comparable with nifedipine in efficacy, often produced side-effects resulting in the drug cancellation (8 out of 20). The efficacy of the calcium inlet blocking agents, especially nifedipine, for therapy of Raynaud's syndrome was emphasized.  相似文献   
947.
The in vitro activities of beta-lactam antibiotics against Bacteroides fragilis and B. fragilis group isolates are presented. Clinical isolates from 1986 were compared with strains from 1979 to 1982. Imipenem, ticarcillin-clavulanic acid, and ceftizoxime were the most active agents. Cefotetan was equivalent to cefoxitin against B. fragilis but less active against B. fragilis group isolates. Enhancement of cefotaxime by its desacetyl metabolite was minimal.  相似文献   
948.
949.
950.
Malignant mixed müllerian tumor of the fallopian tube is an extremely rare neoplasm, with less than 30 cases reported. Clinical signs and symptoms are usually nonspecific and include lower abdominal pain, fever, and vaginal bleeding. The age at diagnosis varies from 14 to 76 years, with a mean of 55 years. Prognosis is poor, with only one woman surviving more than five years. Surgery is the treatment of choice, although chemotherapy may be of some benefit.  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