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   13147篇
  免费   1001篇
  国内免费   23篇
耳鼻咽喉   117篇
儿科学   369篇
妇产科学   308篇
基础医学   1634篇
口腔科学   427篇
临床医学   1479篇
内科学   2421篇
皮肤病学   229篇
神经病学   1189篇
特种医学   620篇
外科学   1723篇
综合类   80篇
一般理论   10篇
预防医学   1286篇
眼科学   119篇
药学   1025篇
中国医学   15篇
肿瘤学   1120篇
  2023年   108篇
  2022年   48篇
  2021年   145篇
  2020年   182篇
  2019年   204篇
  2018年   391篇
  2017年   375篇
  2016年   368篇
  2015年   314篇
  2014年   312篇
  2013年   683篇
  2012年   864篇
  2011年   952篇
  2010年   446篇
  2009年   322篇
  2008年   872篇
  2007年   991篇
  2006年   823篇
  2005年   778篇
  2004年   683篇
  2003年   739篇
  2002年   665篇
  2001年   385篇
  2000年   489篇
  1999年   291篇
  1998年   113篇
  1997年   99篇
  1996年   90篇
  1995年   92篇
  1994年   82篇
  1993年   69篇
  1992年   96篇
  1991年   68篇
  1990年   86篇
  1989年   79篇
  1988年   68篇
  1987年   80篇
  1986年   52篇
  1985年   71篇
  1984年   79篇
  1983年   59篇
  1982年   63篇
  1981年   55篇
  1980年   39篇
  1979年   32篇
  1978年   26篇
  1977年   25篇
  1975年   21篇
  1974年   25篇
  1973年   31篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
162.
163.
164.
165.
166.
167.
OBJECTIVE: To compare the impact on quality of life (QoL) of omeprazole and misoprostol during healing, and omeprazole, misoprostol, and placebo during maintenance treatment in chronic NSAID users with NSAID-associated gastroduodenal lesions. METHODS: Validated baseline and follow-up QoL questionnaires were completed by 610 patients (healing: after 4/8 weeks; maintenance: after 6 months). RESULTS: Patients with arthritis being treated with NSAIDs have a poor QoL. Rheumatoid arthritis causes more joint problems and physical mobility limitations than osteoarthritis. Chronic NSAID use causes heartburn and dyspepsia. QoL improved on both treatments (about equally on two general QOL scales), but omeprazole relieved gastrointestinal symptoms more than misoprostol, particularly reflux, abdominal pain and indigestion symptoms. During maintenance, both treatments maintained QoL, but misoprostol induced diarrhoea. CONCLUSION: QoL in arthritis patients on chronic NSAID treatment is destroyed. Omeprazole is superior to misoprostol for relief and prevention of NSAID-associated gastrointestinal symptoms allowing continued NSAID treatment without compromising the patients' QoL.  相似文献   
168.
169.
In this essay, we call to attention what every medical researcher knows about the etiology of cardiovascular disease but most deny, or choose to ignore, when designing, carrying out, and reporting genetic studies. Medical research is entering an era of synthesis that will take advantage of the successes of reductionism over the past decade in defining and describing human genome variations. Meaningful insights into the role of such variation requires a biological model of genome-phenotype relationships that incorporates interactions between subsets of possible genetic and environmental agents as causations in particular contexts indexed by time and space. We make recommendations for what needs to be done to cope with these complexities.  相似文献   
170.
GH may exert direct growth-promoting and metabolic actions on target tissues, but most of its effects are mediated by circulating (endocrine) or local (auto-/paracrine) IGF-I. The GH/IGF-I system has an important role in cardiac development and in maintaining the structure and function of the heart. A subgroup of children with pronounced heart defects will eventually need transplants, owing to congestive heart failure. Since the symptoms are often severe and may progress while waiting for surgery, it is necessary to develop supportive medical treatment. GH has been proposed as a therapeutic agent in adults with heart failure, but to date studies are lacking on children and more information is necessary. We have examined the expression of IGF-I mRNA and GH-receptor (GH-R) mRNA in children undergoing surgery for congenital heart disease. Eighteen children scheduled for open-heart surgery were included in the study. Right auricular biopsies were taken at the time of venous catheterization preceding cardiac bypass. The specimens were analysed using realtime PCR. We were able to show expression of both IGF-I mRNA and GH-R mRNA in the pediatric heart. The relative expressions were intercorrelated (r=0.75, p<0.001). GH-R mRNA correlated positively to standardized weight (r=0.65, p=0.004), body mass index (BMI) (r=0.59, p=0.01), and standardized BMI (r=0.59, p=0.01). IGF-I mRNA only correlated to BMI (r=0.50, p=0.04). This is the first study displaying cardiac expression of IGF-I mRNA and GH-R mRNA in children with congenital heart disease, although further studies are needed to define a role for GH in the treatment of these patients.  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