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   3234689篇
  免费   257936篇
  国内免费   6643篇
耳鼻咽喉   46068篇
儿科学   102159篇
妇产科学   89151篇
基础医学   452887篇
口腔科学   92545篇
临床医学   295924篇
内科学   632712篇
皮肤病学   69088篇
神经病学   272233篇
特种医学   126999篇
外国民族医学   1186篇
外科学   484907篇
综合类   78365篇
现状与发展   4篇
一般理论   1331篇
预防医学   262582篇
眼科学   76574篇
药学   236601篇
  73篇
中国医学   6556篇
肿瘤学   171323篇
  2018年   34568篇
  2017年   26531篇
  2016年   29491篇
  2015年   33326篇
  2014年   47971篇
  2013年   72614篇
  2012年   97958篇
  2011年   103538篇
  2010年   61084篇
  2009年   58454篇
  2008年   97291篇
  2007年   103294篇
  2006年   104307篇
  2005年   101495篇
  2004年   97365篇
  2003年   93665篇
  2002年   91657篇
  2001年   150845篇
  2000年   155561篇
  1999年   130996篇
  1998年   38393篇
  1997年   34794篇
  1996年   34449篇
  1995年   33039篇
  1994年   30728篇
  1993年   28795篇
  1992年   103542篇
  1991年   99544篇
  1990年   95870篇
  1989年   92170篇
  1988年   85477篇
  1987年   84075篇
  1986年   79255篇
  1985年   75732篇
  1984年   57801篇
  1983年   49250篇
  1982年   30175篇
  1981年   26835篇
  1979年   53485篇
  1978年   37749篇
  1977年   31655篇
  1976年   29757篇
  1975年   31002篇
  1974年   38128篇
  1973年   36434篇
  1972年   34181篇
  1971年   31439篇
  1970年   29735篇
  1969年   27664篇
  1968年   25612篇
排序方式: 共有10000条查询结果,搜索用时 15 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