全文获取类型
收费全文 | 13067篇 |
免费 | 689篇 |
国内免费 | 166篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 448篇 |
妇产科学 | 52篇 |
基础医学 | 521篇 |
口腔科学 | 5篇 |
临床医学 | 3377篇 |
内科学 | 6030篇 |
皮肤病学 | 9篇 |
神经病学 | 175篇 |
特种医学 | 307篇 |
外科学 | 751篇 |
综合类 | 1291篇 |
预防医学 | 169篇 |
药学 | 608篇 |
2篇 | |
中国医学 | 152篇 |
肿瘤学 | 18篇 |
出版年
2023年 | 186篇 |
2022年 | 213篇 |
2021年 | 392篇 |
2020年 | 361篇 |
2019年 | 346篇 |
2018年 | 392篇 |
2017年 | 218篇 |
2016年 | 280篇 |
2015年 | 352篇 |
2014年 | 780篇 |
2013年 | 747篇 |
2012年 | 609篇 |
2011年 | 719篇 |
2010年 | 646篇 |
2009年 | 658篇 |
2008年 | 591篇 |
2007年 | 698篇 |
2006年 | 656篇 |
2005年 | 578篇 |
2004年 | 470篇 |
2003年 | 348篇 |
2002年 | 308篇 |
2001年 | 348篇 |
2000年 | 311篇 |
1999年 | 275篇 |
1998年 | 241篇 |
1997年 | 248篇 |
1996年 | 184篇 |
1995年 | 215篇 |
1994年 | 175篇 |
1993年 | 166篇 |
1992年 | 162篇 |
1991年 | 139篇 |
1990年 | 113篇 |
1989年 | 83篇 |
1988年 | 85篇 |
1987年 | 68篇 |
1986年 | 90篇 |
1985年 | 80篇 |
1984年 | 95篇 |
1983年 | 46篇 |
1982年 | 53篇 |
1981年 | 28篇 |
1980年 | 37篇 |
1979年 | 29篇 |
1978年 | 19篇 |
1977年 | 13篇 |
1976年 | 23篇 |
1975年 | 15篇 |
1973年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 609 毫秒
1.
2.
3.
4.
5.
Yuanqing Yao Jun Qian Shunkang Rong Yuwen Huang Bo Xiong Gang Yang Dengqing Zhang Shimin Deng Jie Tan Que Zhu Changming Deng Dichuan Liu Haitao Ran Zhigang Wang Jing Huang 《Ultrasound in medicine & biology》2019,45(2):490-499
Stellate ganglion (SG) modification has been investigated for arrhythmia treatment. In this study, transesophageal SG imaging and intervention were explored using a homemade 30F integrated focused ultrasonic catheter in healthy mongrel canines in vivo. Anatomic details of SGs were ultrasonically imaged and evaluated. SG had a heterogeneous echoic structure and characteristic profiles sketched by hyper-echoic outlines in an ultrasonogram. Left SGs in the experimental group were successfully ablated through the esophagus under ultrasonic guidance provided by the catheter itself. Two weeks after the ablation, the QT and QTc of the experimental group decreased compared with those of the sham group and at baseline (both p values < 0.001). Histologic examination revealed that left SGs were destroyed. No major complications were observed. This approach may be further explored as a method for ganglia remodeling evaluation and as a strategy of ganglia modification for arrhythmia and for other diseases. 相似文献
6.
《Saudi Pharmaceutical Journal》2022,30(6):669-678
BackgroundIschemia reperfusion (I/R) play an imperative role in the expansion of cardiovascular disease. Sinomenine (SM) has been exhibited to possess antioxidant, anticancer, anti-inflammatory, antiviral and anticarcinogenic properties. The aim of the study was scrutinized the cardioprotective effect of SM against I/R injury in rat.MethodsRat were randomly divided into normal control (NC), I/R control and I/R + SM (5, 10 and 20 mg/kg), respectively. Ventricular arrhythmias, body weight and heart weight were estimated. Antioxidant, inflammatory cytokines, inflammatory mediators and plasmin system indicator were accessed.ResultsPre-treated SM group rats exhibited the reduction in the duration and incidence of ventricular fibrillation, ventricular ectopic beat (VEB) and ventricular tachycardia along with suppression of arrhythmia score during the ischemia (30 and 120 min). SM treated rats significantly (P < 0.001) altered the level of antioxidant parameters. SM treatment significantly (P < 0.001) repressed the level of creatine kinase MB (CK-MB), creatine kinase (CK) and troponin I (Tnl). SM treated rats significantly (P < 0.001) repressed the tissue factor (TF), thromboxane B2 (TXB2), plasminogen activator inhibitor 1 (PAI-1) and plasma fibrinogen (Fbg) and inflammatory cytokines and inflammatory mediators.ConclusionOur result clearly indicated that SM plays anti-arrhythmia effect in I/R injury in the rats via alteration of oxidative stress and inflammatory reaction. 相似文献
7.
8.
《Heart, lung & circulation》2019,28(10):1463-1471
9.
10.
Rotary ventricular assist devices (VADs) are less sensitive to preload than the healthy heart, resulting in inadequate flow regulation in response to changes in patient cardiac demand. Starling‐like physiological controllers (SLCs) have been developed to automatically regulate VAD flow based on ventricular preload. An SLC consists of a cardiac response curve (CRC) which imposes a nonlinear relationship between VAD flow and ventricular preload, and a venous return line (VRL) which determines the return path of the controller. This study investigates the importance of a physiological VRL in SLC of dual rotary blood pumps for biventricular support. Two experiments were conducted on a physical mock circulation loop (MCL); the first compared an SLC with an angled physiological VRL (SLC‐P) against an SLC with a vertical VRL (SLC‐V). The second experiment quantified the benefit of a dynamic VRL, represented by a series of specific VRLs, which could adapt to different circulatory states including changes in pulmonary (PVR) and systemic (SVR) vascular resistance versus a fixed physiological VRL which was calculated at rest. In both sets of experiments, the transient controller responses were evaluated through reductions in preload caused by the removal of fluid from the MCL. The SLC‐P produced no overshoot or oscillations following step changes in preload, whereas SLC‐V produced 0.4 L/min (12.5%) overshoot for both left and right VADs. Additionally, the SLC‐V had increased settling time and reduced controller stability as evidenced by transient controller oscillations. The transient results comparing the specific and standard VRLs demonstrated that specific VRL rise times were improved by between 1.2 and 4.7 s ( = 3.05 s), while specific VRL settling times were improved by between 2.8 and 16.1 seconds ( = 8.38 s) over the standard VRL. This suggests only a minor improvement in controller response time from a dynamic VRL compared to the fixed VRL. These results indicate that the use of a fixed physiologically representative VRL is adequate over a wide variety of physiological conditions. 相似文献