全文获取类型
收费全文 | 3625篇 |
免费 | 228篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 31篇 |
儿科学 | 75篇 |
妇产科学 | 98篇 |
基础医学 | 462篇 |
口腔科学 | 33篇 |
临床医学 | 391篇 |
内科学 | 852篇 |
皮肤病学 | 136篇 |
神经病学 | 245篇 |
特种医学 | 292篇 |
外科学 | 489篇 |
综合类 | 39篇 |
预防医学 | 258篇 |
眼科学 | 39篇 |
药学 | 239篇 |
中国医学 | 5篇 |
肿瘤学 | 206篇 |
出版年
2022年 | 17篇 |
2021年 | 22篇 |
2019年 | 34篇 |
2018年 | 52篇 |
2017年 | 39篇 |
2016年 | 58篇 |
2015年 | 59篇 |
2014年 | 82篇 |
2013年 | 118篇 |
2012年 | 132篇 |
2011年 | 184篇 |
2010年 | 92篇 |
2009年 | 101篇 |
2008年 | 165篇 |
2007年 | 191篇 |
2006年 | 163篇 |
2005年 | 135篇 |
2004年 | 144篇 |
2003年 | 153篇 |
2002年 | 130篇 |
2001年 | 126篇 |
2000年 | 117篇 |
1999年 | 107篇 |
1998年 | 47篇 |
1997年 | 47篇 |
1996年 | 56篇 |
1995年 | 31篇 |
1994年 | 52篇 |
1993年 | 35篇 |
1992年 | 71篇 |
1991年 | 86篇 |
1990年 | 90篇 |
1989年 | 83篇 |
1988年 | 62篇 |
1987年 | 86篇 |
1986年 | 81篇 |
1985年 | 74篇 |
1984年 | 46篇 |
1983年 | 46篇 |
1982年 | 26篇 |
1981年 | 25篇 |
1979年 | 37篇 |
1978年 | 31篇 |
1977年 | 30篇 |
1976年 | 24篇 |
1975年 | 28篇 |
1974年 | 30篇 |
1973年 | 22篇 |
1972年 | 20篇 |
1971年 | 22篇 |
排序方式: 共有3890条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
15.
Nicolas Feltgen Heiko Mueller Beat Ott Martin Frenz Jens Funk 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2003,241(2):94-100
PURPOSE:. To compare the efficacy of endoscopic erbium:YAG laser goniopuncture in glaucoma treatment to trabeculectomy, both methods as adjuncts to cataract surgery. METHODS:. Fifty-nine eyes of 59 glaucoma patients with coexistent cataract were treated by phacoemulsification and endoscopic Er:YAG goniopuncture in a combined fashion. The primary study endpoints were intraocular pressure (IOP), number of antiglaucomatous drugs, postoperative complications, hospitalisation time and visual acuity at 1 year after surgery. To date, 24 eyes have finished the 1-year follow-up. This prospective treatment arm was compared to a retrospective inclusion-matched control group treated by trabeculectomy and cataract surgery in a single procedure. RESULTS:. In the laser-treated group, the mean IOP dropped by 30% from 23.4+/-3.7 mmHg to 16.3+/-6 mmHg ( P<0.0001) after 12 months. Without reoperation, treatment was successful in 71% of these eyes. In the control group, the IOP decreased by 33.5% from 22.7+/-3.3 mmHg to 15.1+/-3.8 mmHg ( P<0.0001). The success rate without reoperation was 46%. The number of antiglaucomatous drugs needed decreased from 1.48+/-0.95 to 0.48+/-0.7 ( P<0.0001) in the laser-treated group and from 2.0+/-0.9 to 0.39+/-0.6 ( P<0.0001) in the control group. Postoperative complications were found more frequently in the control group ( P<0.0001). Hospitalisation was shorter in the laser group ( P<0.0001). Postoperative visual acuity was lower in the control group ( P=0.004). CONCLUSION:. Combined Er:YAG goniopuncture and cataract surgery lowers the IOP to an extent comparable to combined trabeculectomy and cataract surgery. Due to fewer postoperative complications, Er:YAG goniopuncture seems to be superior to standard fistulation surgery as the primary approach within the first year. 相似文献
16.
Amphetamine-induced mesolimbic dopamine release has been reported to reduce prepulse inhibition of the acoustic startle response. In addition, it is well known that mesolimbic dopamine stimulation leads to hyperactivity. The present study was undertaken to explore the possibility that one or the other measure may be a more sensitive in vivo indicator of dopamine release in the nucleus accumbens by determining if the amphetamine dose-response curves for these two behavioral measures were different. The data indicate that the dose-response curves obtained for the different behavioral measures are identical. These data are consistent with the idea that the same dopamine terminal field supports both prepulse inhibition of the acoustic startle response and dopamine-stimulated hyperactivity. 相似文献
17.
18.
J W Babich F Keeling M A Flower L Repetto A Whitton S Fielding A Fullbrook R J Ott V R McCready 《European journal of nuclear medicine》1988,14(1):39-44
A preliminary study of the distribution of the 99mTc complex of hexamethylpropylene amine oxime (HM-PAO) in 12 patients with brain neoplasms before, during, and after radiotherapy has been performed. Untreated brain tumors were found to exhibit a range of 99mTc-HM-PAO uptake, varying from areas of markedly increased isotope activity to photopenic areas, when compared to normal brain tissue. A ratio of 99mTc-HM-PAO tumor uptake to contralateral normal tissue uptake was calculated prior to and during radiotherapy. This ratio tended to return towards unity in lesions responding to therapy. A predictable alteration in whole brain 99mTc-HM-PAO uptake during radiotherapy was not demonstrated. Unlike the radiolabeled amines, 99mTc-HM-PAO localizes in primary tumors, probably indicating that its uptake mechanism is independent of non specific amine receptors. 99mTc-HM-PAO may be useful in the study of brain tumor physiology and response to therapy. 相似文献
19.
20.