全文获取类型
收费全文 | 1806篇 |
免费 | 159篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 52篇 |
妇产科学 | 93篇 |
基础医学 | 196篇 |
口腔科学 | 32篇 |
临床医学 | 212篇 |
内科学 | 322篇 |
皮肤病学 | 38篇 |
神经病学 | 73篇 |
特种医学 | 120篇 |
外科学 | 207篇 |
综合类 | 147篇 |
一般理论 | 3篇 |
预防医学 | 88篇 |
眼科学 | 28篇 |
药学 | 155篇 |
中国医学 | 5篇 |
肿瘤学 | 220篇 |
出版年
2022年 | 11篇 |
2021年 | 43篇 |
2020年 | 24篇 |
2019年 | 45篇 |
2018年 | 41篇 |
2017年 | 29篇 |
2016年 | 41篇 |
2015年 | 34篇 |
2014年 | 56篇 |
2013年 | 76篇 |
2012年 | 96篇 |
2011年 | 111篇 |
2010年 | 60篇 |
2009年 | 67篇 |
2008年 | 93篇 |
2007年 | 93篇 |
2006年 | 80篇 |
2005年 | 96篇 |
2004年 | 70篇 |
2003年 | 77篇 |
2002年 | 58篇 |
2001年 | 51篇 |
2000年 | 53篇 |
1999年 | 60篇 |
1998年 | 34篇 |
1997年 | 35篇 |
1996年 | 26篇 |
1995年 | 22篇 |
1994年 | 23篇 |
1993年 | 23篇 |
1992年 | 23篇 |
1991年 | 34篇 |
1990年 | 23篇 |
1989年 | 28篇 |
1988年 | 20篇 |
1987年 | 16篇 |
1986年 | 16篇 |
1985年 | 12篇 |
1983年 | 12篇 |
1982年 | 10篇 |
1981年 | 19篇 |
1980年 | 9篇 |
1979年 | 18篇 |
1978年 | 9篇 |
1977年 | 12篇 |
1975年 | 12篇 |
1973年 | 10篇 |
1972年 | 16篇 |
1971年 | 15篇 |
1969年 | 13篇 |
排序方式: 共有2004条查询结果,搜索用时 687 毫秒
101.
Resnick DK Choudhri TF Dailey AT Groff MW Khoo L Matz PG Mummaneni P Watters WC Wang J Walters BC Hadley MN;American Association of Neurological Surgeons/Congress of Neurological Surgeons 《Journal of neurosurgery. Spine》2005,2(6):662-669
Discography is an exquisitely sensitive but not specific diagnostic test for the diagnosis of discogenic low-back pain. The restriction of the definition of a positive discographic study to one that elicits concordant pain from a morphologically abnormal disc improves the definition's accuracy. Fusion surgery based on discography alone, however, is not reliably associated with clinical success. Therefore, discography is not recommended as a standalone test for treatment decisions in patients with low-back pain. Magnetic resonance imaging is a sensitive and noninvasive test for the presence of degenerative disc disease. Discography should not be attempted in patients with normal lumbar MR images. Discography appears to have a role in the evaluation of patients with low-back pain, but it is best limited to the evaluation of abnormal interspaces identified on MR imaging, the investigation of adjacent-level disc disease, and as a means to rule out cases of nonorganic pain from surgical consideration. 相似文献
102.
103.
Owen A Janneh O Hartkoorn RC Chandler B Bray PG Martin P Ward SA Hart CA Khoo SH Back DJ 《The Journal of pharmacology and experimental therapeutics》2005,314(3):1202-1209
Highly active antiretroviral therapy has substantially improved prognosis in human immunodeficiency virus (HIV). However, the integration of proviral DNA, development of viral resistance, and lack of permeability of drugs into sanctuary sites (e.g., brain and lymphocyte) are major limitations to current regimens. Previous studies have indicated that the antimalarial drug chloroquine (CQ) has antiviral efficacy and a synergism with HIV protease inhibitors. We have screened a panel of antimalarial compounds for activity against HIV-1 in vitro. A limited efficacy was observed for CQ, mefloquine (MQ), and mepacrine (MC). However, marked synergy was observed between MQ and saquinavir (SQV), but not CQ in U937 cells. Furthermore, enhancement of the antiviral activity of SQV and four other protease inhibitors (PIs) by MQ was observed in MT4 cells, indicating a class specific rather than a drug-specific phenomenon. We demonstrate that these observations are a result of inhibition of multiple drug efflux proteins by MQ and that MQ also displaces SQV from orosomucoid in vitro. Finally, coadministration of MQ and SQV in CD-1 mice dramatically altered the tissue distribution of SQV, resulting in a >3-fold and >2-fold increase in the tissue/blood ratio for brain and testis, respectively. This pharmacological enhancement of in vitro antiviral activity of PIs by MQ now warrants further examination in vivo. 相似文献
104.
105.
106.
107.
108.
109.
110.