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   2366106篇
  免费   173760篇
  国内免费   5821篇
耳鼻咽喉   32500篇
儿科学   78247篇
妇产科学   67424篇
基础医学   346509篇
口腔科学   65922篇
临床医学   218123篇
内科学   456065篇
皮肤病学   48224篇
神经病学   191271篇
特种医学   88524篇
外国民族医学   704篇
外科学   344837篇
综合类   51565篇
现状与发展   2篇
一般理论   755篇
预防医学   191184篇
眼科学   53721篇
药学   177515篇
  7篇
中国医学   5062篇
肿瘤学   127526篇
  2018年   25569篇
  2017年   19282篇
  2016年   21258篇
  2015年   24339篇
  2014年   33641篇
  2013年   51998篇
  2012年   71284篇
  2011年   76022篇
  2010年   44533篇
  2009年   41373篇
  2008年   71228篇
  2007年   76036篇
  2006年   76830篇
  2005年   74714篇
  2004年   71441篇
  2003年   68577篇
  2002年   67076篇
  2001年   104403篇
  2000年   107135篇
  1999年   90597篇
  1998年   26206篇
  1997年   23625篇
  1996年   23590篇
  1995年   22300篇
  1994年   21034篇
  1993年   19630篇
  1992年   72895篇
  1991年   71837篇
  1990年   70121篇
  1989年   67438篇
  1988年   62621篇
  1987年   61193篇
  1986年   58523篇
  1985年   56003篇
  1984年   42065篇
  1983年   36187篇
  1982年   21869篇
  1981年   19393篇
  1979年   39330篇
  1978年   27847篇
  1977年   23489篇
  1976年   22639篇
  1975年   24056篇
  1974年   28775篇
  1973年   28015篇
  1972年   26313篇
  1971年   24430篇
  1970年   22722篇
  1969年   21405篇
  1968年   20245篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
63.
64.
65.
66.
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   
67.
68.
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   
69.
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   
70.
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