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   105338篇
  免费   29884篇
  国内免费   1084篇
耳鼻咽喉   2500篇
儿科学   2988篇
妇产科学   2583篇
基础医学   3473篇
口腔科学   5120篇
临床医学   27344篇
内科学   25789篇
皮肤病学   3359篇
神经病学   12948篇
特种医学   3649篇
外国民族医学   2篇
外科学   18218篇
综合类   260篇
现状与发展   40篇
一般理论   18篇
预防医学   14874篇
眼科学   2234篇
药学   1434篇
中国医学   14篇
肿瘤学   9459篇
  2024年   759篇
  2023年   5121篇
  2022年   1242篇
  2021年   2959篇
  2020年   5510篇
  2019年   2312篇
  2018年   7155篇
  2017年   7548篇
  2016年   8097篇
  2015年   8211篇
  2014年   10662篇
  2013年   12547篇
  2012年   4327篇
  2011年   4087篇
  2010年   7117篇
  2009年   9330篇
  2008年   3914篇
  2007年   2910篇
  2006年   4013篇
  2005年   2484篇
  2004年   1874篇
  2003年   1520篇
  2002年   1430篇
  2001年   1894篇
  2000年   1178篇
  1999年   1725篇
  1998年   2139篇
  1997年   1951篇
  1996年   2003篇
  1995年   1726篇
  1994年   1125篇
  1993年   930篇
  1992年   783篇
  1991年   678篇
  1990年   541篇
  1989年   552篇
  1988年   529篇
  1987年   403篇
  1986年   370篇
  1985年   314篇
  1984年   281篇
  1983年   314篇
  1982年   252篇
  1981年   218篇
  1980年   151篇
  1979年   86篇
  1978年   134篇
  1977年   138篇
  1976年   116篇
  1974年   85篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
6.
7.
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   
8.
Clinical decisions are often made with incomplete information, yet patient care decisions are made every day. Patients vary clinically, uncertainty exists in diagnostic and prognostic information, and many preventive and treatment alternatives have not been formally assessed for their effectiveness. Because scientific information will never answer all clinical questions, clinical decisions are partially based on probabilistic information.
This paper describes how to apply clinical decision making to diagnosing and managing dental caries and periodontal diseases. By using explicit information to quantify probabilities and outcomes, clinical decision making analyzes decisions made under uncertain conditions and the uncertain impact of clinical information.
Clinical decision making incorporates concepts for preventing, diagnosing and treating dental caries and periodontal diseases: risk assessment, evidence-based dentistry, and multiple oral health outcomes. This information can serve as a tool for clinicians to augment clinical judgment and expertise.  相似文献   
9.
High levels of tumor necrosis factor-alpha (TNF-alpha), a pro-inflammatory cytokine, are present in the wound fluid of chronic nonhealing wounds. This leads to increased inflammation, cytokine expression, and ultimately results in impaired wound healing and tissue destruction. Etanercept is a recombinant fusion protein that consists of the soluble TNF receptor (p75) linked to the Fc portion of human IgG1. It is an effective inhibitor of TNF-alpha and has been shown to provide rapid and sustained improvement in rheumatoid arthritis by acting as a soluble receptor binding TNF-alpha and preventing its proinflammatory activities. Therefore, the aim of this study was to determine whether Etanercept could inhibit TNF-alpha activity in chronic wound fluid. Wound fluid was collected from the venous leg ulcers of 16 different patients. The effect of Etanercept on TNF-alpha activity was evaluated using both a TNF-alpha bioassay and an enzyme-linked immunoassay. Etanercept was found to reduce the cytotoxic effect of chronic wound fluid on L929 fibroblasts by approximately 30% and neutralized TNF-alpha binding in the enzyme-linked immunoassay by up to 80%. Direct application of Etanercept to chronic wounds may therefore reduce the inflammatory activity of TNF-alpha, which could reduce the chronicity of venous leg ulcers and thus aid in the healing of these wounds.  相似文献   
10.
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