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   68079篇
  免费   3657篇
  国内免费   89篇
耳鼻咽喉   973篇
儿科学   1999篇
妇产科学   1490篇
基础医学   10113篇
口腔科学   2382篇
临床医学   6392篇
内科学   12417篇
皮肤病学   1682篇
神经病学   7242篇
特种医学   3244篇
外科学   9503篇
综合类   242篇
一般理论   34篇
预防医学   4322篇
眼科学   1310篇
药学   4599篇
中国医学   105篇
肿瘤学   3776篇
  2023年   364篇
  2022年   309篇
  2021年   672篇
  2020年   688篇
  2019年   769篇
  2018年   1499篇
  2017年   1248篇
  2016年   1659篇
  2015年   1420篇
  2014年   1682篇
  2013年   2854篇
  2012年   3714篇
  2011年   4144篇
  2010年   2254篇
  2009年   1587篇
  2008年   4102篇
  2007年   4290篇
  2006年   4113篇
  2005年   4017篇
  2004年   3846篇
  2003年   3865篇
  2002年   3724篇
  2001年   2650篇
  2000年   3368篇
  1999年   1820篇
  1998年   702篇
  1997年   562篇
  1996年   424篇
  1995年   360篇
  1994年   385篇
  1993年   350篇
  1992年   325篇
  1991年   260篇
  1990年   247篇
  1989年   315篇
  1988年   242篇
  1987年   253篇
  1986年   246篇
  1985年   303篇
  1984年   343篇
  1983年   297篇
  1982年   276篇
  1981年   226篇
  1980年   229篇
  1979年   248篇
  1978年   200篇
  1977年   201篇
  1976年   210篇
  1975年   175篇
  1973年   179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.
Background: Research has demonstrated that problem behavior has been associated with substance use, but knowledge is lacking on such associations in a low-income country like Nepal. Aims: This study aimed to find associations between emotional and behavioral problems and substance use among Nepalese adolescents. Method: A cross-sectional study was conducted at the end of 2011, with participants from three schools in the Province 4 of Nepal. We selected 408 adolescents aged 12 to 18 (mean 15.2 years, 54% boys) at one urban and two rural schools. The data were collected using the Youth Self-Report and Adolescents’ Substance Use Measurement. Results: Higher scores on withdrawn/depressed symptoms, thought problems, attention problems, delinquent or aggressive behavior or internalizing or externalizing problems were associated with the use of tobacco, alcohol or other substances. In the broadband scales, only internalizing problems predicted the use of intoxicants. Higher scores for attention problems predicted the use of tobacco, any intoxicants, and high-risk user. Conclusion: Our findings indicated that problem behavior among Nepalese adolescents was associated with substance use. Future studies should explore the association between problem behavior and substance use, including causal factors, so that risky behavior among Nepalese adolescents can be prevented.  相似文献   
7.
8.
9.
Type 1 diabetes is one of the commonest chronic disorders encountered in children and adolescents. When it first becomes apparent in children, approximately 20% of them have clinical and biochemical signs of ketoacidosis (DKA). In the presence of unusual clinical symptoms it is necessary to consider the possibility of associated conditions, such as coeliac disease, immunothyroiditis and Addison’s disease. Children with diabetes must be treated by a multidisciplinary team made up of paediatrician, paediatric diabetes specialist, psychologist, social worker, ophthalmologist, dietitian, nurse and diabetes counsellor, making it essential for them to be treated in regional specialised centres. They are treated in their own psychosocial environment and their families are involved in the therapy. Comprehensive, multidisciplinary treatment strategies have now made it possible for these patients to enjoy normal physical wellbeing and near-normal psychosocial development. Prevention and early treatment of of disturbances associated with diabetes remain an important concern. The fact that type 2 diabetes must now be looked for in overweight children and adolescents is a new aspect of diabetes medicine.  相似文献   
10.
Many cellular signaling pathways are involved in the development of cancer. Depending on the tumor entity, the nature as well as the mode of activation can differ. Some signaling pathways frequently show changes as all tumor cells have to fulfill some basic requirements such as independence from growth factors or insensitivity against apoptosis. In this review, the possibilities of a tumor to manipulate signaling pathways to reach these goals are exemplified based on an archetypical melanoma cell. In addition, new therapeutic options based on the knowledge of signaling pathways will be discussed.  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