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   3521366篇
  免费   266771篇
  国内免费   6880篇
耳鼻咽喉   49745篇
儿科学   112136篇
妇产科学   94675篇
基础医学   495773篇
口腔科学   103130篇
临床医学   320783篇
内科学   681299篇
皮肤病学   74896篇
神经病学   286275篇
特种医学   136570篇
外国民族医学   1084篇
外科学   531101篇
综合类   84011篇
现状与发展   5篇
一般理论   1395篇
预防医学   278510篇
眼科学   84241篇
药学   262423篇
  11篇
中国医学   7485篇
肿瘤学   189469篇
  2018年   37586篇
  2017年   28725篇
  2016年   31775篇
  2015年   36005篇
  2014年   51168篇
  2013年   76938篇
  2012年   104775篇
  2011年   110771篇
  2010年   65597篇
  2009年   61958篇
  2008年   104147篇
  2007年   110953篇
  2006年   111892篇
  2005年   108554篇
  2004年   104572篇
  2003年   100328篇
  2002年   98116篇
  2001年   166766篇
  2000年   172019篇
  1999年   144805篇
  1998年   41137篇
  1997年   36684篇
  1996年   36351篇
  1995年   35173篇
  1994年   32834篇
  1993年   30428篇
  1992年   114847篇
  1991年   111180篇
  1990年   107282篇
  1989年   103631篇
  1988年   95689篇
  1987年   93988篇
  1986年   88854篇
  1985年   84757篇
  1984年   63822篇
  1983年   54378篇
  1982年   32222篇
  1981年   28772篇
  1979年   58792篇
  1978年   41065篇
  1977年   34892篇
  1976年   32654篇
  1975年   34470篇
  1974年   42424篇
  1973年   40478篇
  1972年   37892篇
  1971年   34989篇
  1970年   32871篇
  1969年   30588篇
  1968年   28088篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
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   
94.
95.
96.
97.
98.
99.
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   
100.
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