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   2548篇
  免费   144篇
  国内免费   24篇
耳鼻咽喉   21篇
儿科学   72篇
妇产科学   90篇
基础医学   278篇
口腔科学   19篇
临床医学   195篇
内科学   811篇
皮肤病学   39篇
神经病学   354篇
特种医学   39篇
外科学   195篇
综合类   3篇
预防医学   148篇
眼科学   9篇
药学   162篇
中国医学   5篇
肿瘤学   276篇
  2024年   4篇
  2023年   18篇
  2022年   42篇
  2021年   101篇
  2020年   53篇
  2019年   72篇
  2018年   78篇
  2017年   68篇
  2016年   77篇
  2015年   86篇
  2014年   103篇
  2013年   146篇
  2012年   192篇
  2011年   196篇
  2010年   75篇
  2009年   101篇
  2008年   172篇
  2007年   149篇
  2006年   147篇
  2005年   143篇
  2004年   150篇
  2003年   127篇
  2002年   127篇
  2001年   30篇
  2000年   23篇
  1999年   28篇
  1998年   17篇
  1997年   17篇
  1996年   16篇
  1995年   15篇
  1994年   6篇
  1993年   6篇
  1992年   15篇
  1991年   16篇
  1990年   13篇
  1989年   14篇
  1988年   13篇
  1987年   12篇
  1986年   8篇
  1985年   3篇
  1984年   6篇
  1983年   6篇
  1982年   2篇
  1980年   3篇
  1979年   5篇
  1977年   2篇
  1975年   3篇
  1974年   3篇
  1968年   1篇
  1966年   2篇
排序方式: 共有2716条查询结果,搜索用时 31 毫秒
1.
2.
3.
Objectives. Traditional deep brain stimulation (DBS) at the subthalamic nucleus (STN) has proved to be efficacious on core Parkinsonian symptoms. However, very disabling l ‐dopa–induced abnormal involuntary movements (AIMs) and axial signs are slightly affected, suggesting that we target less conventional targets. Our candidates for DBS were the globus pallidus internus (GPi) plus the intralaminar thalamic complex (Pf or CM), given its extensive functional links with basal ganglia nuclei. Materials and Methods. The routine utilization of our innovative stereotactic apparatus allows us to implant, at the same time, both the CM‐Pf complex together with the GPi in six Parkinson disease patients. Both intraoperative and postoperative neurophysiologic assessments helped us recognize functional subregions while optimizing implantation of electrodes. Unified Parkinson disease rating scale (UPDRS) motor scores, AIMs, and freezing were carefully blindly evaluated for each condition. Results. A significant amelioration of UPDRS scores was achieved by simultaneous activation of both targets. CM‐Pf activation was only slightly effective in reducing rigidity and akinesia, but more efficacious on freezing. Not surprisingly, AIMs were peculiarly decreased by the activation of the permanent electro‐catheter in the posteroventral GPi. Conclusions. These findings confirm that, in selected patients, it is conceivable to target structures other than the conventional STN in order to maximize clinical benefit.  相似文献   
4.
5.
Gardner's syndrome (GS) is a hereditary disorder inherited as autosomal dominant with complete penetrance and variable expression. GS is a variant of familial adenomatous polyposis characterized by extracolonic manifestations including osteomas, dental anomalies, and epidermoid cysts. The association between GS and endocrine abnormalities has been well documented but a direct pituitary involvement has never been reported. We present a case of oral and maxillofacial manifestations in an adult patient affected by GS associated with growth hormone deficiency, a hitherto unreported association. The possible pathogenic mechanisms are discussed.  相似文献   
6.
7.
BACKGROUND: Raloxifene hydrochloride is a synthetic non-steroidal drug used for the prevention and treatment of post-menopausal osteoporosis. Pre-clinical and clinical data have shown that raloxifene may have a beneficial effect on leiomyomas. The aim of this prospective single-blind, randomized, placebo-controlled clinical trial was to evaluate the effectiveness of the addition of raloxifene to GnRH analogues on uterine, leiomyoma, and non-leiomyoma sizes, and on the occurrence of leiomyoma-related symptoms. METHODS: After randomization using a computer-generated list, 100 pre-menopausal women with symptomatic uterine leiomyomas received either leuprolide acetate depot plus raloxifene 60 mg daily (group A) or leuprolide plus placebo tablet (group B) for six cycles of 28 days. At baseline and after treatment, uterine, leiomyoma and non-leiomyoma sizes, and leiomyoma-related symptoms were evaluated for each woman. Analysis was by intention-to-treat method. RESULTS: After six cycles of treatment, a significant decrease in uterine, leiomyoma, and non-leiomyoma sizes was detected in both groups in comparison with baseline. At the same time, no significant difference in uterine and non-leiomyoma sizes was observed between the groups. Leiomyoma sizes were significantly (P < 0.05) lower in group A than in group B. No difference was observed in leiomyoma-related symptoms between groups throughout the study period. CONCLUSIONS: In women treated with GnRH analogue, the raloxifene administration induces a higher reduction of leiomyoma sizes.  相似文献   
8.
We describe a patient with double trisomy 9q34.1-->qter and 21pter-->q22.1 resulting from 3:1 segregation of a maternal balanced translocation. The patient shows a clinical syndrome similar to that observed in patients with duplication of the chromosome 9q distal region, while no signs of trisomy 21 were observed. The use of high resolution banding and FISH were of fundamental importance for the cytogenetic diagnosis and for definition of the breakpoints on both chromosomes 9 and 21.  相似文献   
9.
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