全文获取类型
收费全文 | 75864篇 |
免费 | 6445篇 |
国内免费 | 3113篇 |
专业分类
耳鼻咽喉 | 641篇 |
儿科学 | 1336篇 |
妇产科学 | 1332篇 |
基础医学 | 8648篇 |
口腔科学 | 1489篇 |
临床医学 | 9137篇 |
内科学 | 13815篇 |
皮肤病学 | 1288篇 |
神经病学 | 4316篇 |
特种医学 | 1933篇 |
外国民族医学 | 19篇 |
外科学 | 8186篇 |
综合类 | 10065篇 |
现状与发展 | 7篇 |
一般理论 | 9篇 |
预防医学 | 5729篇 |
眼科学 | 1811篇 |
药学 | 7224篇 |
72篇 | |
中国医学 | 3455篇 |
肿瘤学 | 4910篇 |
出版年
2024年 | 200篇 |
2023年 | 1027篇 |
2022年 | 2301篇 |
2021年 | 3792篇 |
2020年 | 2735篇 |
2019年 | 2492篇 |
2018年 | 2756篇 |
2017年 | 2425篇 |
2016年 | 2175篇 |
2015年 | 3230篇 |
2014年 | 4148篇 |
2013年 | 4442篇 |
2012年 | 6598篇 |
2011年 | 6819篇 |
2010年 | 4426篇 |
2009年 | 3751篇 |
2008年 | 4677篇 |
2007年 | 4565篇 |
2006年 | 4150篇 |
2005年 | 3834篇 |
2004年 | 2868篇 |
2003年 | 2681篇 |
2002年 | 2216篇 |
2001年 | 936篇 |
2000年 | 864篇 |
1999年 | 829篇 |
1998年 | 582篇 |
1997年 | 556篇 |
1996年 | 436篇 |
1995年 | 387篇 |
1994年 | 366篇 |
1993年 | 233篇 |
1992年 | 233篇 |
1991年 | 199篇 |
1990年 | 203篇 |
1989年 | 159篇 |
1988年 | 148篇 |
1987年 | 125篇 |
1986年 | 115篇 |
1985年 | 107篇 |
1984年 | 66篇 |
1983年 | 54篇 |
1982年 | 73篇 |
1981年 | 80篇 |
1980年 | 39篇 |
1979年 | 55篇 |
1978年 | 23篇 |
1977年 | 34篇 |
1976年 | 34篇 |
1975年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 843 毫秒
101.
Juli Busquets Jose Castellote Jaume Torras Juan Fabregat Emilio Ramos Laura Llado Antonio Rafecas Esmeralda de la Banda Juan Figueras 《Journal of gastrointestinal surgery》2007,11(4):458-463
Background Cold ischemia time and the presence of postoperative hepatic arterial thrombosis have been associated with biliary complications
(BC) after liver transplantation. An ABO-incompatible blood group has also been suggested as a factor for predisposal towards
BC. However, the influence of Rh nonidentity has not been studied previously.
Materials Three hundred fifty six liver transplants were performed from 1995 to 2000 at our hospital. BC incidence and risk factors
were studied in 345 patients.
Results Seventy patients (20%) presented BC after liver transplantation. Bile leakage (24/45%) and stenotic anastomosis (21/30%) were
the most frequent complications. Presence of BC in Rh-nonidentical graft–host cases (23/76, 30%) was higher than in Rh-identical
grafts (47/269, 17%) (P = 0.01). BC was also more frequent in grafts with arterial thrombosis (9/25, 36% vs 60/319, 19%; P = 0.03) and grafts with cold ischemia time longer than 430 min (26/174, 15% vs 44/171, 26%; P = 0.01). Multivariate logistic regression confirmed that Rh graft–host nonidentical blood groups [RR = 2(1.1–3.6); P = 0.02], arterial thrombosis [RR = 2.6(1.1–6.4); P = 0.02] and cold ischemia time longer than 430 min [RR = 1.8(1–3.2); P = 0.02] were risk factors for presenting BC.
Conclusion Liver transplantation using Rh graft–host nonidentical blood groups leads to a greater incidence of BC. 相似文献
102.
103.
104.
105.
目的 观察免费板式组合药在DOTS中对合并乙肝的涂阳肺结核病人肝损害情况。方法 比较HBsAg、HBeAg、HBcAb阳性的涂阳肺结核病人与无乙肝的涂阳肺结核病人DOTS前后肝功能损害情况。结果 合并乙肝病人肝损害发生率66.3%,无乙肝者肝损害发生率8.6%,两者相比差异有显著性(P〈0.01)。22.5%病人因肝损害需更改治疗方案。结论 DOTS中合并乙肝的病人采用板式组合药用2H3R3Z3E3/4H3R3方案易发生肝损害,对这类病人应慎用常规方案,并要密切全程观察肝功能,尽可能应用肝损害较小的抗结核药。 相似文献
106.
作者通过对30例颅脑疾患冠状CT扫描资料进行研究,提出在一定情况下,在横断CT扫描的基础上,加用冠状CT扫描或冠矢重建图象,对病变的精确定位、病变的起源和发展方向以及病变与周围结构的关系等很有裨益。 相似文献
107.
胆囊炎、胆石症的发病及复发与饮食密切相关。中医素有“药食同源”之说,《内经》曾有“虚则补之,药以祛之,食以随之”和“谷肉果菜,食养尽之等饮食疗法的论述。饮食疗法简称食疗,首先应遵循食疗原则,主要是注重辨证施食,并辅以药膳。食疗原则胆囊炎、胆石症的食疗目的是注意饮食习惯避免诱发疼痛发作(即胆绞痛),并保证胆囊收缩正常,使胆汁排泄通畅,去除引起胆汁淤滞的因素,抑制胆石的生成。其食疗的基本原则是:1饮食规律忌暴饮暴食。2控制脂肪摄入,适量摄取蛋白质3材料要新鲜,烹调要柔软,口味要清淡。4少吃辛辣品,禁饮酒。5多吃蔬菜、水果,… 相似文献
108.
Juan M. Bellón MD Julia Buján MD Natalio G. Honduvilla MD Alvaro Hernando MD Jacinto Navlet MD 《Annals of vascular surgery》1995,9(3):266-273
Various methods of cryopreservation of human endothelial cells (EC) were studied to determine their viability and behavior when seeded onto vascular prostheses made of polytetrafluoroethylene (PTFE). Three different protocols were used: (1) cyropreservation of whole umbilical vein, (2) cyropreservation of freshly extracted umbilical EC in suspension, and (3) cryopreservation of EC derived from a first subculture. Fresh EC and EC from a first subculture were used as controls. The viability and growth of these cells in culture media were studied, and basal prostacyclin levels were determined. The cells were assessed morphologically after they were seeded onto PTFE discs. Our results showed that the cryopreservation method that maintained the greatest viability was that in which previously cultured EC were used. Basal prostacyclin levels were significantly different following cyropreservation. However, when these cells were seeded onto PTFE discs their behavior was similar to that of fresh EC.We thank W. L. Gore & Associates for supplying the prostheses used in this study.Supported by a grant from the Comision Interministerial de Cieucia y Tecnologia SAF 92/0875. 相似文献
109.
Juan J. Muoz Cristina Roca Jos L. Santos Miguel Arroyo Rafael E. de Salamanca 《Basic & clinical pharmacology & toxicology》1993,73(4):189-191
Two alternatives for the treatment of lead intoxication, administration of zinc or a thiol donor, S-adenosyl-L-methionine (SAM), were analysed. Rats were exposed to lead (Pb)-acetate (60 mg/1) in drinking water during 90 days; one group also received SO4Zn in water (40 mg/l), while another received both Pb and SAM (5 mg/24 hr intraperitoneally. Erythrocytic δ-aminolaevulinic dehydratase (ALA-D) activity was significantly reduced (P<0.001) both in rats receiving Pb alone and in rats receiving Pb and each of the other two treatments. The high erythrocytic uroporphyrinogen synthetase (URO-S) activity noticed in Pb administered rats, was significantly (P< 0.001) reduced in animals treated either with zinc or with SAM. Hepatic ALA-D activity tended to decrease while renal enzyme activity was not modified by the low level Pb exposure used in this work. Interestingly, SAM treated rats in both tissues exhibited significantly (P<0.01) higher activities of the enzyme. It is argued that SAM treatment causes a surplus of thiols that allows the full expression of ALA-D catalytic activity. 相似文献
110.
中风后癫痫59例分析 总被引:3,自引:0,他引:3
对641例中风患者追踪观察1~3年,结果59例出现癫痫发作,中风后癫痫发生率为9.20%;脑出血与脑梗塞癫痫发生率间比较无已著差异(P>0.05);皮层损害者癫痫发生率显著高于皮层下损害者(P<0.01);脑出血继发癫痫发作多属早期发作(8/11),而脑梗塞多属迟发性癫痫发作(40/48)(P<0.01);早期癫痫发作需长期服抗癫痫药控制者显著低于迟发性癫痫发作(P<0.01)。提示:病损波及皮层是重要的致痫因素;早期发作与迟发性癫痫发作的发病机理不同,故表现出治疗与转归不同;迟发性癫痫尤其病灶波及皮层者长期规则服抗癫痫药是必要的。 相似文献