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   4076514篇
  免费   302271篇
  国内免费   10219篇
耳鼻咽喉   57544篇
儿科学   130498篇
妇产科学   111215篇
基础医学   569144篇
口腔科学   116999篇
临床医学   375877篇
内科学   789905篇
皮肤病学   91286篇
神经病学   338527篇
特种医学   158677篇
外国民族医学   1438篇
外科学   610576篇
综合类   91381篇
现状与发展   6篇
一般理论   1727篇
预防医学   325899篇
眼科学   94762篇
药学   301547篇
  11篇
中国医学   7985篇
肿瘤学   214000篇
  2018年   43757篇
  2017年   33649篇
  2016年   38223篇
  2015年   43156篇
  2014年   60737篇
  2013年   92234篇
  2012年   122559篇
  2011年   130048篇
  2010年   77961篇
  2009年   74562篇
  2008年   122064篇
  2007年   129686篇
  2006年   131402篇
  2005年   127041篇
  2004年   122426篇
  2003年   118021篇
  2002年   114881篇
  2001年   187176篇
  2000年   192661篇
  1999年   163411篇
  1998年   48547篇
  1997年   43325篇
  1996年   42946篇
  1995年   41652篇
  1994年   38683篇
  1993年   36197篇
  1992年   129841篇
  1991年   125587篇
  1990年   121395篇
  1989年   117312篇
  1988年   108418篇
  1987年   106804篇
  1986年   100865篇
  1985年   96642篇
  1984年   72699篇
  1983年   62082篇
  1982年   37401篇
  1981年   33642篇
  1979年   66798篇
  1978年   47266篇
  1977年   40050篇
  1976年   37533篇
  1975年   39619篇
  1974年   48019篇
  1973年   45853篇
  1972年   43133篇
  1971年   39953篇
  1970年   37336篇
  1969年   35295篇
  1968年   32478篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
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   
102.
103.
104.
105.
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   
106.
107.
108.
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   
109.
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   
110.
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