全文获取类型
收费全文 | 2368篇 |
免费 | 165篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 144篇 |
妇产科学 | 96篇 |
基础医学 | 328篇 |
口腔科学 | 27篇 |
临床医学 | 308篇 |
内科学 | 494篇 |
皮肤病学 | 26篇 |
神经病学 | 133篇 |
特种医学 | 61篇 |
外科学 | 372篇 |
综合类 | 30篇 |
一般理论 | 5篇 |
预防医学 | 121篇 |
眼科学 | 20篇 |
药学 | 200篇 |
中国医学 | 1篇 |
肿瘤学 | 136篇 |
出版年
2023年 | 7篇 |
2022年 | 14篇 |
2021年 | 54篇 |
2020年 | 48篇 |
2019年 | 41篇 |
2018年 | 50篇 |
2017年 | 34篇 |
2016年 | 32篇 |
2015年 | 47篇 |
2014年 | 88篇 |
2013年 | 93篇 |
2012年 | 142篇 |
2011年 | 147篇 |
2010年 | 88篇 |
2009年 | 82篇 |
2008年 | 157篇 |
2007年 | 153篇 |
2006年 | 132篇 |
2005年 | 178篇 |
2004年 | 161篇 |
2003年 | 143篇 |
2002年 | 133篇 |
2001年 | 25篇 |
2000年 | 22篇 |
1999年 | 26篇 |
1998年 | 34篇 |
1997年 | 19篇 |
1996年 | 20篇 |
1995年 | 10篇 |
1994年 | 17篇 |
1993年 | 19篇 |
1992年 | 20篇 |
1991年 | 21篇 |
1990年 | 22篇 |
1989年 | 15篇 |
1988年 | 12篇 |
1987年 | 20篇 |
1986年 | 22篇 |
1985年 | 22篇 |
1984年 | 7篇 |
1983年 | 14篇 |
1982年 | 19篇 |
1981年 | 15篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1977年 | 7篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1971年 | 7篇 |
1965年 | 5篇 |
排序方式: 共有2536条查询结果,搜索用时 31 毫秒
1.
Gil Bolotin Frederik H. van der Veen Roberto Lorusso Tamir Wolf Robert Sachner Rona Shofti Jan J. Shreuder Gideon Uretzky 《European journal of cardio-thoracic surgery》2002,21(6):975-980
Objective: Descending and ascending aortomyoplasty are two surgical procedures intended to induce hemodynamic benefits similar to those of the intra-aortic-balloon-pump (IABP). To date, there have been no studies comparing the two surgical techniques. The objective of this study was to compare coronary blood flow augmentation and afterload reduction as produced by descending and ascending aortomyoplasty counterpulsation Methods: Twenty-two mongrel dogs (18–35 kg) underwent IABP application (n=7), descending (n=8), or ascending (n=7) aortomyoplasty. Left anterior descending (LAD) coronary artery blood flow was measured using a Transonic Doppler flow probe. Left ventricular pressure as well as aortic pressures proximal and distal to either the aortomyoplasty site or the IABP position were monitored continuously. Results: Descending aortomyoplasty induced higher elevation in the LAD blood flow during assisted beats (27% from 10.8±4 to 13.8±6 ml/min, P<0.001) than that induced by either ascending aortomyoplasty (19% from 11.7±5 to 14±5 ml/min, P<0.001) or IABP counterpulsation (18% from 8.6±3 to 10.2±4 ml/min, P<0.001). Conversely, while ascending aortomyoplasty reduced the left ventricular end-diastolic pressure by 16% (from 60±18 to 50±22 mmHg, P<0.001), similar to the 16% after load reduction achieved by the IABP counterpulsation, descending aortomyoplasty failed to induce afterload reduction. Conclusions: Descending aortomyoplasty produces higher coronary blood flow augmentation than either ascending aortomyoplasty or IABP. However, afterload reduction comparable to that achieved by IABP was observed only with ascending aortomyoplasty and not with descending aortomyoplasty. 相似文献
2.
3.
Safety of gadolinium during pregnancy 总被引:4,自引:0,他引:4
4.
1. The literature concerning inhalation infection with Coccidioides immitis is briefly reviewed. 2. A laboratory technique for exposing animals to inhalation of the spores of Coccidioides immitis is described. 3. Primary pulmonary infection was produced in 42 per cent of 72 animals exposed by this method. 4. No marked weight loss was apparent in the animals infected. 5. Skin tests with coccidioidin were not entirely satisfactory in diagnosis. Positive skin tests with coccidioidin were obtained in many of the infected animals, but inconsistencies occurred. 6. The gross and microscopic lesions are briefly described and illustrated. 相似文献
5.
6.
Eliezer Lahat MD Joseph Barr MD Baruch Klin MD Zvi Dvir MD Tzvy Bistrizer MD Gideon Eshel MD 《Pediatric neurology》1996,15(4):299-301
Mild head injuries are very common among young children. Often, these injuries are followed by a variety of subjective complaints termed posttraumatic syndrome. Posturography (balance test) was performed immediately after the trauma in 21 children who had sustained mild head injury. Significant difference in performance was observed in head-injured children in all subparts of the test as compared with a control group. We conclude that posturography may serve as a simple cost-effective method in qualifying the posttraumatic imbalance. 相似文献
7.
Gideon Fait MD Dan Grisaru MD Michael Shenhav MD Michael J. Kupfermine MD Joseph B. Lessing MD M. Reuben Peyser MD Ariel Jaffa MD 《The Australian & New Zealand journal of obstetrics & gynaecology》1997,37(2):174-176
Summary: One hundred five women with a documented pregnancy of 41 weeks' gestation or more, admitted for induction of labour by balloon catheter with extra-amniotic saline instillation, were retrospectively compared to 196 women admitted in spontaneous labour at the same gestational age, with regard to mode of delivery. The success rate of the induction group was 97.1%. The mode of delivery did not differ significantly between the 2 groups. The Caesarean section rates were 11.4% in the induction group versus 9.7% in the spontaneous group. The mode of delivery after induction of labour by balloon catheter with extra-amniotic saline instillation and simultaneously commenced intravenous oxytocin infusion, in pregnancies of 41 weeks or more, is similar to that of spontaneous deliveries at the same gestational age. 相似文献
8.
9.
Gal Ophir Ninette Amariglio Jasmine Jacob-Hirsch Ran Elkon Gideon Rechavi Daniel M. Michaelson 《Neurobiology of disease》2005,20(3):519-718
Apolipoprotein E4 (apoE4), the major genetic risk factor of Alzheimer's disease (AD), is associated with enhanced brain inflammation. Genome-wide gene expression profiling was employed to study the effects of apoE genotype on hippocampal gene expression in LPS-treated mice, transgenic for either apoE4 or the AD benign allele, apoE3. This revealed that the expression of inflammation-related genes following intracerebroventricular injection of LPS was significantly higher and more prolonged in apoE4 than in apoE3 transgenic mice. Clustering analysis revealed gene clusters which responded differently in apoE4 and apoE3 mice and were significantly enriched in NF-kappaB response elements. Direct measurement of NF-kappaB-regulated genes revealed that their extent of activation was greater in the apoE4 mice. Immunohistochemistry experiments revealed that microglial and NF-kappaB activation were more pronounced in apoE4 than in apoE3 mice. These findings suggest that the increased brain inflammation in apoE4 mice is related to disregulation of NF-kappaB signaling pathway. 相似文献
10.
W Lack R Windhager R Eyb F Meznik 《Zeitschrift für Orthop?die und ihre Grenzgebiete》1989,127(2):187-190
Total disc mobility, segmental mobility, both depending upon location of the disc and upon its position within the scoliotic curve as well as the opening angle of the disc in the ap x-ray were measured in the so-called "bending-test" x-rays of the lumbar curve of 40 patients with idiopathic scoliosis. The measurements showed a maximum of mobility in the segments L2/3, L3/4 and L4/5. In no direct dependence an increased mobility of the most proximal motion segment against the next lower one of the lumbar curve was found. No direct relation between lateral flexion and degree of scoliosis was measurable. Mobility towards the convexity increases directly with the opening angle of the disc concerned while mobility towards the concavity decreases; lateral flexion remains constant altogether. The results achieved might become quite relevant in connection with the possible therapeutic progress in the treatment of lumbar scoliosis with enzymatic dissolution of nucleus pulposus. 相似文献