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   3374篇
  免费   289篇
  国内免费   23篇
耳鼻咽喉   14篇
儿科学   255篇
妇产科学   127篇
基础医学   463篇
口腔科学   74篇
临床医学   350篇
内科学   649篇
皮肤病学   32篇
神经病学   212篇
特种医学   500篇
外科学   335篇
综合类   99篇
预防医学   237篇
眼科学   30篇
药学   179篇
中国医学   3篇
肿瘤学   127篇
  2021年   28篇
  2020年   25篇
  2019年   29篇
  2018年   50篇
  2017年   27篇
  2016年   43篇
  2015年   58篇
  2014年   66篇
  2013年   113篇
  2012年   116篇
  2011年   122篇
  2010年   133篇
  2009年   109篇
  2008年   91篇
  2007年   107篇
  2006年   121篇
  2005年   102篇
  2004年   82篇
  2003年   73篇
  2002年   75篇
  2001年   78篇
  2000年   77篇
  1999年   82篇
  1998年   145篇
  1997年   136篇
  1996年   149篇
  1995年   109篇
  1994年   85篇
  1993年   95篇
  1992年   61篇
  1991年   70篇
  1990年   47篇
  1989年   82篇
  1988年   71篇
  1987年   83篇
  1986年   77篇
  1985年   76篇
  1984年   56篇
  1983年   50篇
  1982年   54篇
  1981年   31篇
  1980年   50篇
  1979年   27篇
  1978年   28篇
  1977年   28篇
  1976年   31篇
  1975年   32篇
  1973年   16篇
  1972年   20篇
  1971年   25篇
排序方式: 共有3686条查询结果,搜索用时 15 毫秒
1.
BACKGROUND: Our aims in the present study were to estimate the influences of pain and urinary symptoms on quality of life, and to determine which of these two variables has the most predictive power with respect to quality of life in young men with chronic prostatitis-like symptoms. METHODS: Chronic prostatitis-like symptoms were measured by the National Institutes of Health-Chronic Prostatitis Symptom Index. Of the 28,841 men aged 20 years who lived in the study community, 18,495 men (a response rate 64.1%) agreed to participate in the study. A total of 1057 men who complained of symptoms indicative of chronic prostatitis were included in the study. The influences of pain and urinary symptoms on quality of life were determined using logistic regression analysis. The receiver operating characteristic (ROC) curve was used to estimate the predictive ability of each of these variables with respect to quality of life. RESULTS: Results from multivariate analysis showed that both pain and urinary symptoms were associated with an increased likelihood of impaired quality of life, although pain contributed more to a reduced quality of life than urinary symptoms. Relative to men who experienced mild pain, men who experienced moderate pain had a 3.9-fold risk of poor quality of life (odds ratio [OR], 3.87; 95% confidence interval [CI], 2.86-5.23; P < 0.001) and those who experienced severe pain had a 15.7-fold risk of reduced quality of life (OR, 15.68; 95% CI, 6.59-37.35; P < 0.001). Moderate urinary symptoms were associated with a 1.4-fold risk of bother (OR, 1.41; 95% CI, 1.01-1.99; P < 0.001) and severe urinary symptoms were associated with 2.4-fold risk (OR, 2.39; 95% CI, 1.37-4.12; P < 0.001), relative to mild urinary symptoms. Comparison of the effects of pain and urinary symptoms showed that pain severity had the most predictive power for bother, quality of life, and quality-of-life impact. The areas under the ROC curves for bother, quality of life, and quality-of-life impact were 71.3%, 69.3% and 72.5%, respectively. CONCLUSION: Urinary symptoms and pain might be associated with an increased likelihood of impaired quality of life in young men with chronic prostatitis-like symptoms. In addition, our findings suggest that pain severity is the most influential variable for determining quality of life in this population.  相似文献   
2.
3.
4.
5.
6.
Evaluation of an on-line patient exposure meter in neuroradiology   总被引:1,自引:0,他引:1  
  相似文献   
7.
Pediatric knee MR imaging: pattern of injuries in the immature skeleton   总被引:3,自引:0,他引:3  
  相似文献   
8.
9.
Unilateral epidural analgesia occurring in a parturient three times in successive pregnancies is reported. Possible causes are reviewed, and clinical and radiological evidence in support of the most likely explanation are presented.  相似文献   
10.
We used proton nuclear magnetic resonance spectroscopy in this preliminary study of perchloric acid extracts of 12 Alzheimer's disease (AD) and five control brain samples to measure the relative levels of taurine, aspartate, glutamine, glutamate, gamma-aminobutyric acid (GABA), and the putative neuronal marker, N-acetyl-L-aspartate (NAA). We found no significant changes in taurine, aspartate, or glutamine. NAA was lower in AD compared with control, and this decrease correlated with the number of senile plaques and neurofibrillary tangles in adjacent tissue sections. GABA levels also were lower in AD brain. Glutamate levels were greater in AD than control and showed a close, inverse correlation with NAA levels. These findings suggest that the decrease in NAA reflects neuronal loss and that remaining neurons could be exposed to a relative excess of glutamate and a relative lack of GABA. If present in the neurotransmitter pool, this imbalance could result in neurotoxic cell damage. This hypothesis is further supported by in vitro and in vivo phosphorus 31 nuclear magnetic resonance findings.  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