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   7116篇
  免费   434篇
  国内免费   10篇
耳鼻咽喉   31篇
儿科学   143篇
妇产科学   121篇
基础医学   932篇
口腔科学   89篇
临床医学   970篇
内科学   1309篇
皮肤病学   86篇
神经病学   619篇
特种医学   319篇
外科学   836篇
综合类   44篇
一般理论   3篇
预防医学   856篇
眼科学   98篇
药学   532篇
中国医学   64篇
肿瘤学   508篇
  2023年   45篇
  2022年   59篇
  2021年   136篇
  2020年   98篇
  2019年   124篇
  2018年   179篇
  2017年   142篇
  2016年   151篇
  2015年   211篇
  2014年   264篇
  2013年   379篇
  2012年   571篇
  2011年   630篇
  2010年   330篇
  2009年   296篇
  2008年   530篇
  2007年   538篇
  2006年   490篇
  2005年   473篇
  2004年   411篇
  2003年   351篇
  2002年   363篇
  2001年   56篇
  2000年   45篇
  1999年   61篇
  1998年   67篇
  1997年   51篇
  1996年   41篇
  1995年   41篇
  1994年   36篇
  1993年   32篇
  1992年   23篇
  1991年   25篇
  1990年   22篇
  1989年   15篇
  1988年   17篇
  1987年   18篇
  1986年   24篇
  1985年   15篇
  1984年   12篇
  1983年   14篇
  1982年   11篇
  1979年   13篇
  1978年   8篇
  1977年   12篇
  1976年   10篇
  1975年   9篇
  1971年   8篇
  1970年   9篇
  1966年   12篇
排序方式: 共有7560条查询结果,搜索用时 0 毫秒
51.
52.
53.
A kindred was diagnosed with atypical MEN type 2B characterized by medullary thyroid cancer and mucosal neurilemmomas in multiple family members. Mutation analysis revealed a double RET germline mutation, Val804Met and Ser904Cys, in affected individuals. The clinical phenotype, the functional effect of the mutations, and the clinical implications of our findings are discussed.  相似文献   
54.
OBJECTIVE: Arterial remodeling aims to maintain a constant circumferential wall stress (sigmac). A failing remodeling process is associated with stroke. Data on the relationship between chronic kidney disease and arterial remodeling are scarce. METHODS: We investigated the association between a lower glomerular filtration rate (GFR) and microalbuminuria with arterial remodeling of the common carotid artery (CCA) in a population-based study of 806 patients. CCA properties including intima-media thickness and interadventitial diameter (IAD) were assessed. Lumen diameter, circumferential wall tension (CWT), and circumferential wall stress (sigmac) were calculated. GFR was estimated (eGFR) by the Modification of Diet in Renal Disease formula. Albuminuria was expressed as urinary albumin/creatinine ratio. RESULTS: Mean eGFR was 60.3 (+/-10.8) ml/min/1.73 m2; median urinary albumin/creatinine ratio was 0.57 (range 0.10-26.6 mg/mmol). After adjustment for age, sex, glucose tolerance status, and prevalent cardiovascular disease, eGFR was not independently associated with CCA properties. A greater urinary albumin/creatinine ratio (per quartile) was associated with a greater lumen diameter [regression coefficient beta with 95% confidence interval, 0.14 (0.08-0.20; P < 0.01)], IAD [0.15 (0.09-0.21; P < 0.01)], CWT [0.95 (0.52-1.38; P < 0.01)], and sigmac [1.7 (0.5-2.9; P < 0.01)] but not with a greater IMT [0.01 (-0.002-0.02; P = 0.12)]. Additional adjustments for mean arterial pressure, pulse pressure, and eGFR did not change the results. CONCLUSION: Greater albuminuria is independently associated with an increase in lumen diameter and IAD of the CCA. In addition, greater albuminuria is associated with a maladaptive carotid remodeling process as shown by an increase in CWT and sigmac. These findings may explain, why microalbuminuria is associated with a greater risk of cardiovascular disease and especially stroke.  相似文献   
55.

Purpose

The aim of the present study was to evaluate the efficacy of an oral formulation of Δ9-tetrahydrocannabinol (ECP002A) in patients with progressive multiple sclerosis (MS).

Methods

This accelerated proof-of-concept study consisted of 2 phases: a crossover challenge (dose-finding) phase and a 4-week, parallel, randomized, placebo-controlled treatment phase. Twenty-four patients with progressive MS and moderate spasticity were enrolled. During the treatment phase, biomarkers for efficacy and secondary pharmacodynamic effects were measured at baseline and after 2 and 4 weeks of treatment. Serum samples were collected to determine pharmacokinetic properties and perform population modeling. Safety and tolerability profiles were assessed based on adverse events and safety measurements.

Findings

Pain was significantly reduced when measured directly after administration of ECP002A in the clinic but not when measured in a daily diary. A similar pattern was observed in subjective muscle spasticity. Other clinical outcomes were not significantly different between active treatment and placebo. Cognitive testing indicated that there was no decline in cognition after 2 or 4 weeks of treatment attributable to ECP002A compared with placebo.ImplicationsThis study specifically underlines the added value of thorough investigation of pharmacokinetic and pharmacodynamic associations in the target population. Despite the complex interplay of psychoactive effects and analgesia, the current oral formulation of Δ9-tetrahydrocannabinol may play a role in the treatment of spasticity and pain associated with MS because it was well tolerated and had a stable pharmacokinetic profile.  相似文献   
56.
57.
58.
59.
AIDS and Behavior - Despite having some of the world’s highest rates of HIV, there is a lack of knowledge on correlates of transmission risk among gay, bisexual and other men who have sex...  相似文献   
60.
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