全文获取类型
收费全文 | 2127篇 |
免费 | 132篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 162篇 |
妇产科学 | 26篇 |
基础医学 | 248篇 |
口腔科学 | 57篇 |
临床医学 | 195篇 |
内科学 | 525篇 |
皮肤病学 | 26篇 |
神经病学 | 79篇 |
特种医学 | 492篇 |
外科学 | 173篇 |
综合类 | 29篇 |
预防医学 | 81篇 |
眼科学 | 15篇 |
药学 | 89篇 |
中国医学 | 5篇 |
肿瘤学 | 78篇 |
出版年
2023年 | 6篇 |
2022年 | 8篇 |
2021年 | 16篇 |
2020年 | 15篇 |
2019年 | 17篇 |
2018年 | 31篇 |
2017年 | 17篇 |
2016年 | 34篇 |
2015年 | 38篇 |
2014年 | 52篇 |
2013年 | 78篇 |
2012年 | 56篇 |
2011年 | 43篇 |
2010年 | 93篇 |
2009年 | 74篇 |
2008年 | 53篇 |
2007年 | 45篇 |
2006年 | 55篇 |
2005年 | 40篇 |
2004年 | 40篇 |
2003年 | 34篇 |
2002年 | 34篇 |
2001年 | 44篇 |
2000年 | 41篇 |
1999年 | 37篇 |
1998年 | 138篇 |
1997年 | 130篇 |
1996年 | 125篇 |
1995年 | 95篇 |
1994年 | 80篇 |
1993年 | 84篇 |
1992年 | 36篇 |
1991年 | 36篇 |
1990年 | 26篇 |
1989年 | 64篇 |
1988年 | 48篇 |
1987年 | 57篇 |
1986年 | 48篇 |
1985年 | 50篇 |
1984年 | 28篇 |
1983年 | 31篇 |
1982年 | 37篇 |
1981年 | 20篇 |
1980年 | 36篇 |
1979年 | 16篇 |
1978年 | 15篇 |
1977年 | 18篇 |
1976年 | 25篇 |
1975年 | 26篇 |
1966年 | 3篇 |
排序方式: 共有2284条查询结果,搜索用时 15 毫秒
1.
JA HYEON KU CHEOL KWAK SEUNG-JUNE OH EUNSIK LEE SANG EUN LEE JAE-SEUNG PAICK 《International journal of urology》2004,11(7):489-493
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.
In order to clarify the physiological role in vivo of H2O2-detoxifying enzymes at low and high levels of O2 tension we studied catalase (CAT), glutathione peroxidases (GP), and in vivo peroxidation (TBA-RS) in the lung and heart of Rana perezi frogs chronically treated with hyperoxia, aminotriazole (AT) -a CAT inhibitor-, or both. Hyperoxia did not change CAT, GP or TBA-RS. Aminotriazole caused an almost complete depletion of CAT, a 30% decrease of GP and a 132% (lung) to 200% (heart) increase of TBA-RS. Changes similar to these were found in the group treated with AT in hyperoxia. No mortality or changes in total or organ weight occurred in the experimental groups. Main conclusions are: (1) The maximal hyperoxia tolerance showed by frogs among vertebrates does not need antioxidant enzyme induction from lung or heart and is probably related to the presence of high constitutive levels of GP in relation to metabolic rate. (2) Even in normoxia the tissues present significant amounts of H2O2, and CAT is needed to avoid oxidative damage. GP does not compensate its absence. The implications of these results in relation to oxygen toxicity in man is discussed. 相似文献
3.
4.
5.
6.
7.
8.
José I. Bilbao Manuel Ruza Jesús M. Longo Francisco Mansilla Antonio Picardi Vanessa de Villa Fernando Pardo Jesús Sola Jorge Quiroga 《Cardiovascular and interventional radiology》1994,17(4):210-213
Posttransplant lymphoproliferative disorders are infrequent tumors related to chronic immunosuppressive therapy. We present a liver transplant recipient who developed such a tumor in the porta hepatis that provoked obstruction of the entire portal triad. Treatment consisted of systemic chemotherapy, percutaneous dilatation, and placement of Wallstent endoprostheses across both biliary and portal vein stenoses. The patient died 3 weeks later of pneumonia and sepsis. At necropsy, the tumor was completely necrosed and the prostheses in both the common bile duct and the portal vein were patent. 相似文献
9.
10.