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   1494404篇
  免费   102739篇
  国内免费   3462篇
耳鼻咽喉   21654篇
儿科学   48764篇
妇产科学   44361篇
基础医学   219337篇
口腔科学   41763篇
临床医学   124947篇
内科学   290022篇
皮肤病学   31659篇
神经病学   117532篇
特种医学   59729篇
外国民族医学   393篇
外科学   230902篇
综合类   31547篇
现状与发展   1篇
一般理论   368篇
预防医学   105550篇
眼科学   34634篇
药学   114285篇
  1篇
中国医学   3454篇
肿瘤学   79702篇
  2018年   15212篇
  2016年   13386篇
  2015年   15405篇
  2014年   20297篇
  2013年   30243篇
  2012年   42529篇
  2011年   44727篇
  2010年   26455篇
  2009年   24497篇
  2008年   43372篇
  2007年   47072篇
  2006年   47646篇
  2005年   46791篇
  2004年   44814篇
  2003年   43783篇
  2002年   42974篇
  2001年   67240篇
  2000年   68978篇
  1999年   58518篇
  1998年   16814篇
  1997年   14825篇
  1996年   14480篇
  1995年   13587篇
  1994年   12873篇
  1993年   11948篇
  1992年   45478篇
  1991年   44884篇
  1990年   44230篇
  1989年   42929篇
  1988年   40018篇
  1987年   39131篇
  1986年   37299篇
  1985年   35648篇
  1984年   26394篇
  1983年   22917篇
  1982年   13636篇
  1981年   12009篇
  1979年   25131篇
  1978年   17507篇
  1977年   15141篇
  1976年   14250篇
  1975年   15959篇
  1974年   18616篇
  1973年   17991篇
  1972年   17196篇
  1971年   15982篇
  1970年   14778篇
  1969年   14247篇
  1968年   13429篇
  1967年   11782篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
I discuss various viewpoints of physically disabled and nondisabled persons. I then question which views to preserve and which need to be changed as regards the subject of supervision of the physically disabled. I believe that illness and/or being physically disabled require different definitions and that for many physically disabled persons there is no either-or. In various theories it is asked how the physically disabled can be supported in their personal development, when it is maintained held that both disabled and non-disabled persons have the same mental and emotional conditions and requirements. The following theories will be considered: role theory, labeling theory, which holds to the idea of "self-fulfilling prophesy", the concept of the five pillars of identity, the expectations of self-effectiveness and of results and the theory of internal locus of control. It is a question of whether the physically disabled, like the nondisabled, should take the responsibility for their personal development upon themselves. In closing, I discuss where supervision can have a supportive effect in helping the physically disabled achieve greater personal development. Personal development improves the quality of life. Supervision for those who work with the physically disabled should contribute to reaching these goals.  相似文献   
72.
73.
74.
75.
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   
76.
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   
77.
Cell physiology and molecular biology typically follow a reductionistic approach in science. In the last decade, molecular principles and pathogenetic factors involved in the development of many diseases have been successfully discovered. Therefore, early biological concepts based on systemic and cybernetic thoughts have been largely overshadowed by these more recent molecular and pathogenetic factors. This review highlights discoveries on bone development and hypothalamic controlled feeding and eating behavior with a cybernetic and systemic perspective. Interestingly, ancient ideas on bone development and hypothalamic function are still reasonable considerations to embed new molecular discoveries into a systemic concept of principles organizing nature.  相似文献   
78.
79.
The onset of the sporadic Creutzfeldt-Jakob disease is usually characterized by dementia or neurological symptoms. We are reporting the case of a 31 year-old man with a sporadic Creutzfeldt-Jakob disease characterized by a schizophrenia-like onset. The schizophrenic symptoms developed for sixteen months before the neurological symptoms appeared. The psychiatric onset of the present case was linked with the early age of onset and the long duration of the disease and could have been influenced by polymorphism of the codon 129 of the prion protein gene (PRNP) and a type of pathological prion protein (PrPres).  相似文献   
80.
G Pauletto  P Bergonzi 《Seizure》2006,15(3):150-155
The antiepileptic efficacy and tolerability of oxcarbazepine, used both as monotherapy and adjunctive therapy, were observed for 1 year in 202 adult patients, aged 17-83 years, with newly diagnosed or refractory partial epilepsy in clinical practice in Italy. At first observation, the seizure free rate was 72.2% in newly diagnosed patients given monotherapy, 40% in patients in whom oxcarbazepine replaced another monotherapy and 10.3% in patients given oxcarbazepine as adjunctive therapy. At least 50% reduction in seizure frequency was achieved in 90.7, 72 and 57%, respectively. Efficacy increased with the duration of treatment (p < 0.0001). In the 160 completers the seizure free rate was 61.3% with monotherapy and 28% with adjunctive therapy. 16.3% of patients reported adverse effects, mainly sedation and sleepiness; 5% discontinued oxcarbazepine because of adverse events. OXC is an effective and well-tolerated antiepileptic agent for the long-term treatment of partial epilepsy in adults.  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