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   1285463篇
  免费   93545篇
  国内免费   1994篇
耳鼻咽喉   18288篇
儿科学   42518篇
妇产科学   37940篇
基础医学   188175篇
口腔科学   35518篇
临床医学   109357篇
内科学   252893篇
皮肤病学   26680篇
神经病学   100237篇
特种医学   50367篇
外国民族医学   366篇
外科学   198591篇
综合类   26661篇
现状与发展   1篇
一般理论   305篇
预防医学   93456篇
眼科学   29270篇
药学   98408篇
  3篇
中国医学   2499篇
肿瘤学   69469篇
  2018年   11953篇
  2015年   11763篇
  2014年   16176篇
  2013年   24687篇
  2012年   33963篇
  2011年   36388篇
  2010年   21478篇
  2009年   20243篇
  2008年   35350篇
  2007年   38348篇
  2006年   38953篇
  2005年   38211篇
  2004年   36763篇
  2003年   35725篇
  2002年   35238篇
  2001年   58375篇
  2000年   59849篇
  1999年   50917篇
  1998年   14330篇
  1997年   12896篇
  1996年   13159篇
  1995年   12404篇
  1994年   11838篇
  1993年   10940篇
  1992年   41162篇
  1991年   40539篇
  1990年   40066篇
  1989年   38875篇
  1988年   36290篇
  1987年   35487篇
  1986年   33884篇
  1985年   32302篇
  1984年   24026篇
  1983年   20943篇
  1982年   12454篇
  1981年   10996篇
  1980年   10271篇
  1979年   22729篇
  1978年   15968篇
  1977年   13798篇
  1976年   13037篇
  1975年   14268篇
  1974年   16754篇
  1973年   16147篇
  1972年   15396篇
  1971年   14278篇
  1970年   13271篇
  1969年   12789篇
  1968年   12026篇
  1967年   10531篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
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   
24.
25.
OBJECTIVE: To survey nurses around the world about current practices for peritoneal dialysis (PD) home training programs. DESIGN: Random sampling of nurses to complete a written survey from the International Society for Peritoneal Dialysis Nursing Liaison Committee. Settings: United States, Canada, South America (Brazil, Columbia), The Netherlands, Hong Kong. METHODS: Surveys and responses were sent by fax whenever possible, or by regular mail, or hand carried, or conducted by telephone. Results were stratified by geographic areas as well as by cumulative responses and were expressed as medians with ranges. Kruskal-Wallis was used to evaluate differences in responses. Associations between variables were tested with Pearson correlation. Univariate regression analysis was used to evaluate the impact of variables on peritonitis rates. Variables with p < 0.10 were included in a multivariate analysis. RESULTS: A total of 317 nurses responded: 88 in the United States, 46 in Canada, 58 in South America, 58 in Hong Kong, and 67 in The Netherlands. This represented 37% of all surveys distributed. Respondents had a median of 12 years' experience in nephrology (range 1-35 years), but only 31% had a formal background in adult education. Nearly half received their guidance to patient training from a nurse colleague, 11% were guided by a corporate colleague, and 8% were simply self-taught. Clinics responding had a median of 30 PD patients (range 1-400) and reported they trained a median of 8 patients per year (range 0-86). Reported peritonitis rates were a median 0.46 per year or 1 episode every 26 months. Peritonitis rates, however, were not known by 53% of respondents. Total training time per patient had a very wide range of hours, from 6 to 96. There was no correlation between training time and peritonitis rates among the study respondents (p = 0.38), nor with any other variables. CONCLUSIONS: There is wide variation in practices for PD patient training programs within countries and around the world. Training time did not appear to be related to peritonitis rates. Randomized trials of training practices are needed to determine which approaches produce the best outcomes for patients.  相似文献   
26.
27.
28.
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   
29.
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   
30.
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