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   1403001篇
  免费   97602篇
  国内免费   2249篇
耳鼻咽喉   20411篇
儿科学   46443篇
妇产科学   40887篇
基础医学   205415篇
口腔科学   38755篇
临床医学   117833篇
内科学   273550篇
皮肤病学   29754篇
神经病学   111431篇
特种医学   56738篇
外国民族医学   390篇
外科学   218383篇
综合类   27315篇
现状与发展   1篇
一般理论   337篇
预防医学   98827篇
眼科学   32294篇
药学   106577篇
  1篇
中国医学   2764篇
肿瘤学   74746篇
  2018年   14034篇
  2016年   12586篇
  2015年   14434篇
  2014年   18946篇
  2013年   28448篇
  2012年   39939篇
  2011年   41864篇
  2010年   24758篇
  2009年   22926篇
  2008年   40878篇
  2007年   44393篇
  2006年   44984篇
  2005年   44449篇
  2004年   42637篇
  2003年   41646篇
  2002年   41043篇
  2001年   62269篇
  2000年   63767篇
  1999年   54261篇
  1998年   15332篇
  1997年   13727篇
  1996年   13749篇
  1995年   12908篇
  1994年   12284篇
  1993年   11353篇
  1992年   42602篇
  1991年   41971篇
  1990年   41464篇
  1989年   40159篇
  1988年   37333篇
  1987年   36585篇
  1986年   34883篇
  1985年   33278篇
  1984年   24813篇
  1983年   21512篇
  1982年   12864篇
  1981年   11371篇
  1979年   23587篇
  1978年   16568篇
  1977年   14334篇
  1976年   13496篇
  1975年   14974篇
  1974年   17484篇
  1973年   16812篇
  1972年   16062篇
  1971年   14926篇
  1970年   13832篇
  1969年   13314篇
  1968年   12561篇
  1967年   11011篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
We report the case of a 38-year-old woman who presented with chronic lower abdominal pain. Her past medical history included a splenectomy due to abdominal trauma. Ultrasound examination revealed four pelvic tumors which, upon laparotomy, were found to be the result of splenosis. Approximately 100 cases of splenosis have been reported but only a minority of them have been published in the gynecological literature. Our case indicates that those involved in pelvic scanning (even of asymptomatic women) and/or treating those complaining of lower abdominal pain or presenting with pelvic tumors should be aware of splenosis as a possible diagnosis.  相似文献   
32.
33.
The increased number of lymphocytes in airways during an asthmatic response is believed to be the result of increased recruitment of these cells. However, it is possible that a decreased apoptotic rate could also contribute to the increased number. The aim of the present study was to investigate whether allergen airway provocation influences the apoptotic phenotype of lung and peripheral blood lymphocytes (PBL) in subjects with atopic asthma. Bronchoalveolar lavage (BAL) lymphocytes and PBL from 12 asthmatic subjects previously challenged with allergen (n = 7) or saline (n = 5) were exposed to the apoptotic stimulus tributyltin (TBT) in vitro and assayed for apoptosis. Airway allergen provocation resulted in decreased sensitivity of BAL lymphocytes to TBT-induced apoptosis, with 42.2% (range 33.9-62.5%) apoptotic cells before challenge versus 23.5% (range 15.3-42.4%) after challenge, while PBL were unaffected. The increased apoptosis resistance correlated with higher numbers of Bcl-2-expressing lymphocytes. Interestingly, baseline caspase-3-like activity was significantly elevated in viable BAL lymphocytes compared with viable PBL, and was unaltered by allergen exposure. In conclusion, allergen inhalation renders bronchoalveolar lavage lymphocytes more resistant to apoptosis while peripheral blood lymphocytes were not influenced at all, indicating that the apoptotic phenotype of airway lymphocytes may play a role in asthmatic inflammation.  相似文献   
34.
35.
36.
Neu-Laxova syndrome (NLS) is a rare autosomal recessive syndrome, characterized by severe intrauterine growth retardation (IUGR), microcephaly, abnormal brain development, oedema and ichthyosis. It was first reported in 1971 by Neu et al. (Pediatrics 47: 610-612) and since then no more than 60 cases have been reported. A newborn girl delivered from a 29-year-old healthy mother was admitted to hospital with a thick membrane covering her body and dismorphic appearance. The diagnosis of NLS was made according to characteristic features. The syndrome is known to have a poor prognosis and the baby lived for 9 weeks. This case is one of the longest living cases of NLS and the fourth case reported from Turkey.  相似文献   
37.
Leocani  L.  Comi  G. 《Neurological sciences》2006,27(1):s27-s29
Neurological Sciences - Brain plasticity, intended as the pattern of functional and structural changes in responses to environmental physiological or pathological events, is underlined by several...  相似文献   
38.
39.
40.
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