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   1639篇
  免费   157篇
  国内免费   1篇
耳鼻咽喉   7篇
儿科学   70篇
妇产科学   56篇
基础医学   240篇
口腔科学   9篇
临床医学   181篇
内科学   245篇
皮肤病学   44篇
神经病学   207篇
特种医学   8篇
外科学   194篇
综合类   17篇
一般理论   6篇
预防医学   256篇
眼科学   10篇
药学   119篇
中国医学   1篇
肿瘤学   127篇
  2023年   26篇
  2022年   31篇
  2021年   88篇
  2020年   50篇
  2019年   86篇
  2018年   86篇
  2017年   64篇
  2016年   67篇
  2015年   69篇
  2014年   93篇
  2013年   109篇
  2012年   155篇
  2011年   134篇
  2010年   63篇
  2009年   58篇
  2008年   86篇
  2007年   109篇
  2006年   76篇
  2005年   79篇
  2004年   75篇
  2003年   61篇
  2002年   44篇
  2001年   3篇
  2000年   4篇
  1999年   5篇
  1998年   7篇
  1997年   6篇
  1996年   4篇
  1995年   4篇
  1994年   8篇
  1993年   9篇
  1992年   3篇
  1991年   4篇
  1990年   3篇
  1989年   3篇
  1988年   2篇
  1987年   3篇
  1986年   2篇
  1985年   2篇
  1983年   1篇
  1982年   1篇
  1981年   2篇
  1980年   3篇
  1979年   2篇
  1976年   1篇
  1973年   1篇
  1970年   1篇
  1969年   1篇
  1965年   1篇
  1961年   1篇
排序方式: 共有1797条查询结果,搜索用时 31 毫秒
1.
There is a dearth of research examining treatment engagement and attendance among runaway youth and their families. Such research is needed in order to inform treatment providers on factors associated with engagement and maintenance of these difficult to engage families into counseling. This study examined differential treatment attendance for alcohol abusing runaway youth residing at a local shelter. A traditional office-based family systems approach, Functional Family Therapy (FFT), was compared to a non-traditional, home-based, multi-systemic family therapy approach, Ecologically Based Family Therapy (EBFT). As expected, treatment engagement and attendance was significantly higher for those assigned to EBFT (N = 37) compared to FFT (N = 40). Predictors of treatment attendance (income, family chaos, externalization problems and level of youth substance use) were examined within each treatment modality. Findings suggest that home-based (compared to office-based) treatment modalities may significantly increase treatment attendance and engagement of runaway youth and their families. Non-traditional forms of treatment may need to be considered in order to best meet the needs of highly chaotic and disorganized family systems.  相似文献   
2.
3.
4.
5.
In many cases of sporadic frontotemporal dementia (FTD) and in FTD caused by tau mutations (FTDP-17) there is disruption of the normal splicing of tau leading to the aberrant expression of tau isoforms and neurodegeneration. This suggests a central role for tau in the pathogenesis of FTD. However, more than half the cases of sporadic FTD show no tau deposition. We question whether altered expression is also involved in the pathogenesis of tau-negative FTD. Real-time polymerase chain reaction was used to investigate tau isoform expression in tau-negative FTD and age-matched controls. There were no differences in total tau mRNA or 4R versus 3R isoform expression. Our study suggests that perturbed tau mRNA expression is unlikely to be involved in the pathogenesis of tau-negative FTD.  相似文献   
6.
D-cycloserine augmented exposure therapy for obsessive-compulsive disorder.   总被引:1,自引:1,他引:0  
BACKGROUND: D-cycloserine (DCS), a glutamatergic partial N-methyl-d-aspartate (NMDA) agonist, can facilitate extinction learning related to cued fear in animals and humans. We predicted that DCS would accelerate obsession-related distress reduction in patients with obsessive-compulsive disorder (OCD) undergoing extinction-based exposure therapy. METHODS: We administered DCS (125 mg) or placebo in a double-blind fashion to individuals with OCD approximately 2 hours before each exposure session. RESULTS: D-cycloserine decreased both the number of exposure sessions required to achieve clinical milestones and the rate of therapy dropout. After four exposure sessions, patients in the DCS group reported significantly greater decreases in obsession-related distress compared with the placebo group; however, after additional sessions, the placebo group tended to catch up. CONCLUSIONS: D-cycloserine augmentation has the potential to increase the efficiency, palatability, and overall effectiveness of standard exposure therapy for OCD.  相似文献   
7.
8.
9.
10.
ERPs were elicited by two types of orthographically legal, pronounceable nonwords. One nonword set was derived from and resembled real words, whereas the other set did not. Nonwords derived from related root words elicited N400 semantic priming effects similar to those obtained for words, indicating semantic activation of the root words. N400 repetition priming effects from nonderived nonwords were similar to those obtained for words. The elicitation of N400 by only derived nonwords would have suggested it was generated by the activation of word meanings, per se. However, both types of nonwords produced an N400, and an N400 priming effect. Because nonderived nonwords are not associated with meaning, the N400 cannot be generated by semantic activation per se. Rather, the N400 appears to be generated by orthographic/phonological analysis and is attenuated by the top-down feed of semantic information to the orthographic/phonological level.  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