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   3231892篇
  免费   257622篇
  国内免费   6656篇
耳鼻咽喉   45967篇
儿科学   102133篇
妇产科学   89168篇
基础医学   452755篇
口腔科学   92457篇
临床医学   295509篇
内科学   631784篇
皮肤病学   69040篇
神经病学   271790篇
特种医学   126923篇
外国民族医学   1186篇
外科学   484769篇
综合类   78375篇
现状与发展   4篇
一般理论   1331篇
预防医学   262573篇
眼科学   76501篇
药学   236469篇
  5篇
中国医学   6554篇
肿瘤学   170877篇
  2018年   34562篇
  2017年   26525篇
  2016年   29468篇
  2015年   33299篇
  2014年   47950篇
  2013年   72618篇
  2012年   97962篇
  2011年   103547篇
  2010年   61088篇
  2009年   58468篇
  2008年   97318篇
  2007年   103313篇
  2006年   104341篇
  2005年   101520篇
  2004年   97392篇
  2003年   93686篇
  2002年   91677篇
  2001年   150853篇
  2000年   155562篇
  1999年   131005篇
  1998年   38403篇
  1997年   34795篇
  1996年   34458篇
  1995年   33037篇
  1994年   30729篇
  1993年   28798篇
  1992年   103545篇
  1991年   99545篇
  1990年   95870篇
  1989年   92164篇
  1988年   85481篇
  1987年   84082篇
  1986年   79258篇
  1985年   75729篇
  1984年   57803篇
  1983年   49254篇
  1982年   30174篇
  1981年   26841篇
  1979年   53490篇
  1978年   37750篇
  1977年   31658篇
  1976年   29764篇
  1975年   31005篇
  1974年   38131篇
  1973年   36441篇
  1972年   34187篇
  1971年   31443篇
  1970年   29740篇
  1969年   27669篇
  1968年   25619篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
73.
74.
75.
76.
77.
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   
78.
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   
79.
80.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  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