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   4072360篇
  免费   301703篇
  国内免费   10214篇
耳鼻咽喉   57472篇
儿科学   130361篇
妇产科学   111189篇
基础医学   568510篇
口腔科学   116948篇
临床医学   375211篇
内科学   789373篇
皮肤病学   91243篇
神经病学   338032篇
特种医学   158556篇
外国民族医学   1438篇
外科学   610046篇
综合类   91173篇
现状与发展   6篇
一般理论   1721篇
预防医学   325325篇
眼科学   94699篇
药学   301269篇
  11篇
中国医学   7983篇
肿瘤学   213711篇
  2018年   43677篇
  2017年   33603篇
  2016年   38169篇
  2015年   43070篇
  2014年   60654篇
  2013年   92075篇
  2012年   122349篇
  2011年   129846篇
  2010年   77852篇
  2009年   74441篇
  2008年   121859篇
  2007年   129430篇
  2006年   131176篇
  2005年   126819篇
  2004年   122215篇
  2003年   117832篇
  2002年   114671篇
  2001年   187051篇
  2000年   192542篇
  1999年   163296篇
  1998年   48488篇
  1997年   43268篇
  1996年   42913篇
  1995年   41615篇
  1994年   38640篇
  1993年   36151篇
  1992年   129763篇
  1991年   125533篇
  1990年   121335篇
  1989年   117248篇
  1988年   108368篇
  1987年   106749篇
  1986年   100822篇
  1985年   96579篇
  1984年   72643篇
  1983年   62033篇
  1982年   37356篇
  1981年   33617篇
  1979年   66756篇
  1978年   47234篇
  1977年   40022篇
  1976年   37496篇
  1975年   39597篇
  1974年   47988篇
  1973年   45814篇
  1972年   43108篇
  1971年   39926篇
  1970年   37310篇
  1969年   35279篇
  1968年   32453篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Endoscopic clips have been used mainly for control of gastrointestinal (GI) bleeding and occasionally for closure of GI perforations. However, closure of spontaneous esophageal perforation (Boerhaave's syndrome) by clipping has not been reported. We described successful non-surgical closure of spontaneous esophageal perforation by endoscopic clipping in a patient with bilateral pyopneumothorax and septicemia.  相似文献   
103.
104.
105.
106.
Primary chemotherapy administered to breast cancer patientsis the best model to identify baseline features able to predictwhich patients may be most likely to benefit or not from a cytotoxicregimen. In the March issue of Annals of Oncology two papersevaluated the predictive role of immunohistochemical p53 expressionon  相似文献   
107.
108.
109.
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization.  相似文献   
110.
PURPOSE: In children with locally advanced or recurrent malignant tumours, prognosis can be improved by regional deep hyperthermia (RHT) in combination with platin-based chemotherapy. However, because of the increasing number of patients that achieve long-time remission with this therapy, it is necessary to evaluate long-term sequelae of thermochemotherapy. During the years 1993-2004 one has observed avascular osteonecrosis (AON) of the femoral head after RHT in seven children with pelvic germ cell tumours or rhabdomyosarcomas. METHODS: Although AON may develop in patients with malignancies treated with chemo- or radiotherapy alone, RHT might nevertheless contribute to the occurrence of AON. In order to determine potential risk factors for AON after RHT, this study analysed the relationship of AON to the patient's age, medical history and treatment parameters such as thermal dose equivalent and power output. RESULTS AND CONCLUSIONS: In the present study AON was associated with young age as well as intensity of hyperthermia indicated by high power levels that exceed 20 W per kg body weight and/or application of eight or more heat sessions as well as additional radiotherapy. Based on this observation, it was assumed that an optimized three dimensional thermal field modelling may be helpful to avoid hazardous temperatures in the femoral heads during RHT treatment and to reduce AON of the femoral heads.  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