全文获取类型
收费全文 | 77847篇 |
免费 | 5439篇 |
国内免费 | 1665篇 |
专业分类
耳鼻咽喉 | 3106篇 |
儿科学 | 931篇 |
妇产科学 | 1525篇 |
基础医学 | 1982篇 |
口腔科学 | 3156篇 |
临床医学 | 7720篇 |
内科学 | 7551篇 |
皮肤病学 | 707篇 |
神经病学 | 2580篇 |
特种医学 | 1301篇 |
外国民族医学 | 21篇 |
外科学 | 26575篇 |
综合类 | 10506篇 |
现状与发展 | 7篇 |
一般理论 | 2篇 |
预防医学 | 2812篇 |
眼科学 | 4651篇 |
药学 | 3115篇 |
167篇 | |
中国医学 | 861篇 |
肿瘤学 | 5675篇 |
出版年
2024年 | 261篇 |
2023年 | 2116篇 |
2022年 | 3245篇 |
2021年 | 4240篇 |
2020年 | 4233篇 |
2019年 | 3592篇 |
2018年 | 3436篇 |
2017年 | 2930篇 |
2016年 | 2931篇 |
2015年 | 2996篇 |
2014年 | 5922篇 |
2013年 | 5490篇 |
2012年 | 4427篇 |
2011年 | 4665篇 |
2010年 | 3711篇 |
2009年 | 3523篇 |
2008年 | 3373篇 |
2007年 | 3356篇 |
2006年 | 2916篇 |
2005年 | 2563篇 |
2004年 | 2222篇 |
2003年 | 1773篇 |
2002年 | 1400篇 |
2001年 | 1328篇 |
2000年 | 1142篇 |
1999年 | 1042篇 |
1998年 | 863篇 |
1997年 | 834篇 |
1996年 | 616篇 |
1995年 | 506篇 |
1994年 | 443篇 |
1993年 | 356篇 |
1992年 | 303篇 |
1991年 | 301篇 |
1990年 | 207篇 |
1989年 | 203篇 |
1988年 | 200篇 |
1987年 | 200篇 |
1986年 | 161篇 |
1985年 | 173篇 |
1984年 | 169篇 |
1983年 | 109篇 |
1982年 | 125篇 |
1981年 | 98篇 |
1980年 | 78篇 |
1979年 | 45篇 |
1978年 | 33篇 |
1977年 | 34篇 |
1976年 | 25篇 |
1975年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
目的探究面肌痉挛患者微血管减压术(MVD)中异常肌反应(AMR)的变化特点与术后疗效的关系。方法回顾性分析73例MVD术中采用AMR全程定量化监测患者的AMR变化特点,减压操作前AMR阈值较基础阈值升高≥1倍为A1组、1倍为A2组,手术结束时AMR完全消失为B1组、未消失为B2组,B2组中AMR阈值较基础阈值升高≥1倍为B2a组、1倍为B2b组,对各组的术后疗效进行对比分析。结果 A1组21例中,19例立即治愈,1例延迟治愈,1例未愈; A2组52例中,35例立即治愈,9例延迟治愈,8例未愈。A1组较A2组疗效好(P=0. 046)。B1组50例中,42例立即治愈,5例延迟治愈,3例未愈; B2组23例中,12例立即治愈,5例延迟治愈,6例未愈。B1组较B2组疗效好(P=0. 003)。B2 a组的治愈比例较B2 b组高(分别为14/16、3/7),差异有统计学意义(P=0. 045)。结论 AMR在术中的变化特点对术者有重要参考意义,AMR在减压前升高、在手术结束时完全消失、未消失但升高较基础阈值≥1倍者术后疗效相对较好。 相似文献
13.
14.
15.
目前临床研究已证实腹腔镜胃癌根治术治疗早期胃癌的安全性、可行性和有效性。基于此,第4版日本《胃癌治疗指南》推荐腹腔镜手术治疗临床Ⅰ期远端胃癌。然而,腹腔镜胃癌手术治疗进展期胃癌的有效性和安全性仍存争议。中国腹腔镜胃肠外科研究组(CLASS研究组)发起的CLASS-01研究顺利完成,提供了全球首个局部进展期胃癌腹腔镜手术安全性和疗效的前瞻性多中心证据。胃癌外科的主流方向在从“大切口和扩大化手术切除”逐渐向“微创、精准化手术”转变,以使手术安全性和病人术后生活质量最优化。 相似文献
16.
17.
18.
����ǿ�������Σ����������������� ٻ 《中国实用口腔科杂志》2015,8(5):297-301
??Objective To observe the effects of lithium chloride pretreatment on cognitive ability of aged rats after oral and maxillofacial surgery. Methods A total of 48 aged male SD rats??18 ~ 20 months old??weight 550 ~ 700 g?? were bought from the Experimental Animal Center of China Medical University . These rats were randomly divided into three groups??including the normal control group??group C??n=16????surgery and anesthesia group??group O??n=16????and lithium chloride preconditioning group??group L??n=16??.Rats in each group were randomly divided into two parts??one part was given Morris water maze test three days after the surgery and its characteristics of behavior tested. Another part was decapitated 24 h after the surgery and extracted and the hippocampus brain separated at the same time. Test expression content of IL-1β GSK-3β p-GSK-3β??ser9??in the hippocampus by Elisa and Western blotting detection method respectively. Results Morris water maze test showed that??the first day after surgery??latencies of group L and O were significantly longer than group C??compared with group C in swimming distance?? latency and swim distances of group L were shorter than group O. With the comparison of multiple analysis of variance??differences were statistically significant??P??0.05??. Groups L and O in the second day were slightly shortened compared to the first day??on the third day after surgery it has also improved over the second day. Space exploration experiments in rats showed that??the dwell time of group C was significantly longer in the platform quadrant and the frequency of crossing the platform also increased compared with groups L and O. In addition??group L and group O were higher in IL-β levels than group C??the difference being statistically significant by analysis of variance??P??0.05????but group L was significantly lower compared with group O??the difference being statistically significant??P??0.05??. The content of GSK-3β of three groups were of no significant difference??P > 0.05????but p-GSK-3β??ser9??content was significantly lower in group L and O than in group C. The content of GSK-3β of group L was higher than in group O??the difference being statistically significant??P??0.05??. Conclusion Pretreatment with lithium chloride in postoperative aged rats can inhibit the expression of inflammatory cytokines and increase GSK-3β phosphorylation in the hippocampus cells??so p-GSK-3β??ser9??upregulates and inhibites the apoptosis of brain cells??thereby improved cognitive abilities after the cavity and maxillofacial surgery. 相似文献
19.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
20.
目的:调查心脏瓣膜置换术后患者的出院准备度现状,并分析其影响因素。方法:于2018年9月至2019年3月用一般资料、出院准备度量表、出院指导质量量表对139例瓣膜置换术后患者进行调查。结果:心脏瓣膜置换术后患者的出院准备度总分为(89.51±8.53)分,与出院指导质量呈正相关;多元回归分析显示,主要照顾者、婚姻状况、工作状态、服药种类、出院指导质量为出院准备度影响因素。结论:心脏瓣膜置换术后患者的出院准备度有待提高,患者感知的个人状态得分不理想;护士应鼓励患者配合进行早期康复,强化出院指导,采取有效措施提供康复信息,满足患者及其家属需求,提高出院准备度。 相似文献