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   3213472篇
  免费   257694篇
  国内免费   9345篇
耳鼻咽喉   45290篇
儿科学   100970篇
妇产科学   86490篇
基础医学   446843篇
口腔科学   92369篇
临床医学   293871篇
内科学   635278篇
皮肤病学   69714篇
神经病学   269787篇
特种医学   129101篇
外国民族医学   1111篇
外科学   490028篇
综合类   76953篇
现状与发展   3篇
一般理论   1313篇
预防医学   262617篇
眼科学   73638篇
药学   233834篇
  9篇
中国医学   5773篇
肿瘤学   165519篇
  2018年   32921篇
  2016年   29253篇
  2015年   32933篇
  2014年   46921篇
  2013年   71179篇
  2012年   92351篇
  2011年   98413篇
  2010年   59371篇
  2009年   57198篇
  2008年   92916篇
  2007年   98998篇
  2006年   100071篇
  2005年   97487篇
  2004年   93534篇
  2003年   90643篇
  2002年   88256篇
  2001年   147423篇
  2000年   152418篇
  1999年   128330篇
  1998年   38670篇
  1997年   34885篇
  1996年   35193篇
  1995年   34657篇
  1994年   32481篇
  1993年   30410篇
  1992年   104922篇
  1991年   101691篇
  1990年   98120篇
  1989年   93985篇
  1988年   87471篇
  1987年   86251篇
  1986年   81647篇
  1985年   78465篇
  1984年   59809篇
  1983年   50975篇
  1982年   31520篇
  1981年   28355篇
  1980年   26680篇
  1979年   55698篇
  1978年   39840篇
  1977年   33555篇
  1976年   31351篇
  1975年   32917篇
  1974年   40111篇
  1973年   38194篇
  1972年   35735篇
  1971年   33106篇
  1970年   30928篇
  1969年   28802篇
  1968年   26497篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
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   
92.
93.
94.
95.
96.
97.
98.
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   
99.
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   
100.
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