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   4339篇
  免费   244篇
  国内免费   11篇
耳鼻咽喉   31篇
儿科学   114篇
妇产科学   107篇
基础医学   613篇
口腔科学   114篇
临床医学   372篇
内科学   857篇
皮肤病学   53篇
神经病学   481篇
特种医学   239篇
外科学   637篇
综合类   23篇
预防医学   334篇
眼科学   108篇
药学   211篇
中国医学   1篇
肿瘤学   299篇
  2023年   24篇
  2022年   56篇
  2021年   88篇
  2020年   76篇
  2019年   86篇
  2018年   107篇
  2017年   88篇
  2016年   113篇
  2015年   130篇
  2014年   154篇
  2013年   165篇
  2012年   297篇
  2011年   315篇
  2010年   192篇
  2009年   169篇
  2008年   218篇
  2007年   241篇
  2006年   223篇
  2005年   231篇
  2004年   265篇
  2003年   226篇
  2002年   194篇
  2001年   62篇
  2000年   67篇
  1999年   76篇
  1998年   67篇
  1997年   36篇
  1996年   26篇
  1995年   20篇
  1994年   24篇
  1993年   20篇
  1992年   53篇
  1991年   39篇
  1990年   33篇
  1989年   49篇
  1988年   32篇
  1987年   33篇
  1986年   34篇
  1985年   19篇
  1984年   24篇
  1983年   15篇
  1982年   18篇
  1981年   12篇
  1980年   12篇
  1979年   21篇
  1977年   9篇
  1975年   10篇
  1974年   12篇
  1972年   11篇
  1968年   10篇
排序方式: 共有4594条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Acute administration of neuroleptic drugs alters the extracellular level of ascorbate in the neostriatum, and increasing evidence suggests a role for this vitamin in the behavioral, and possibly therapeutic, effects of these drugs. To shed further light on this issue, extracellular ascorbate was recorded in the neostriatum and nucleus accumbens of awake, behaving rats following chronic treatment with either classical (haloperidol) or atypical (clozapine) neuroleptics or ascorbate itself. Electrochemically modified, carbon-fiber microelectrodes were lowered in place the day after the last of 21 daily injections of either haloperidol (0.5 mg/kg, SC), clozapine (20 mg/kg, IP), sodium ascorbate (500 mg/kg, IP) or vehicle. Voltammetric measurements were obtained during quiet rest and following administration ofd-amphetamine (2.5 mg/kg). Repeated treatment with either haloperidol or ascorbate elevated basal extracellular ascorbate and potentiated the amphetamine-induced increase in ascorbate release in neostriatum but not nucleus accumbens. Both treatment groups also showed a significant increase in amphetamine-induced sniffing and repetitive head movements compared to vehicle-treated animals. In contrast, repeated clozapine had no effect on extracellular ascorbate in either neostriatum or nucleus accumbens, but increased the locomotor response to an amphetamine challenge. Thus, to the extent that increases in neostriatal ascorbate exert neuroleptic-like effects, such effects are likely to parallel haloperidol rather than clozapine.  相似文献   
6.
7.
8.
Self-evaluation is crucial to mental and social well-being. It influences aspirations, personal goals and interaction with others. This paper stresses the importance of self-esteem as a protective factor and a non-specific risk factor in physical and mental health. Evidence is presented illustrating that self-esteem can lead to better health and social behavior, and that poor self-esteem is associated with a broad range of mental disorders and social problems, both internalizing problems (e.g. depression, suicidal tendencies, eating disorders and anxiety) and externalizing problems (e.g. violence and substance abuse). We discuss the dynamics of self-esteem in these relations. It is argued that an understanding of the development of self-esteem, its outcomes, and its active protection and promotion are critical to the improvement of both mental and physical health. The consequences for theory development, program development and health education research are addressed. Focusing on self-esteem is considered a core element of mental health promotion and a fruitful basis for a broad-spectrum approach.  相似文献   
9.
OBJECTIVES: The use of OKT3 for treatment of advanced high-grade acute rejection episodes eventually can result in cytokine release and consecutive pulmonary edema. Temporary extracorporeal membrane oxygenation (ECMO) bridging can be used to overcome this crucial period before the beneficial effects of OKT3 can be observed. METHODS: We summarize our experience with three patients, who underwent lung transplantation and presented with severe acute rejection episodes. OKT3 had to be initiated due to insufficient response to standard rejection therapy with corticosteroids. Upon initiation of OKT3 treatment, a massive life-threatening deterioration of lung function in spite of heavily invasive respirator treatment was seen and temporary ECMO support was imperative to support graft function. Results of this treatment were retrospectively reviewed. RESULTS: In all cases femoro-femoral veno-arterial ECMO was used for support of the impaired graft and after a period of 4-5 days led to a massive improvement of graft function. In the further course two patients could be discharged from hospital and are still alive 30 and 36 months, respectively, after the described incident. One patient died 4 months later due to liver failure. CONCLUSIONS: We conclude that the use of ECMO support in patients experiencing significant side effects from OKT3 therapy is a useful and effective therapeutic tool to overcome the initial critical period until the lung has sufficiently recovered.  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