全文获取类型
收费全文 | 12133篇 |
免费 | 718篇 |
国内免费 | 64篇 |
专业分类
耳鼻咽喉 | 110篇 |
儿科学 | 272篇 |
妇产科学 | 186篇 |
基础医学 | 1992篇 |
口腔科学 | 183篇 |
临床医学 | 1134篇 |
内科学 | 2735篇 |
皮肤病学 | 320篇 |
神经病学 | 1228篇 |
特种医学 | 675篇 |
外科学 | 1939篇 |
综合类 | 90篇 |
一般理论 | 2篇 |
预防医学 | 526篇 |
眼科学 | 203篇 |
药学 | 643篇 |
中国医学 | 7篇 |
肿瘤学 | 670篇 |
出版年
2023年 | 72篇 |
2022年 | 126篇 |
2021年 | 229篇 |
2020年 | 142篇 |
2019年 | 201篇 |
2018年 | 221篇 |
2017年 | 219篇 |
2016年 | 279篇 |
2015年 | 317篇 |
2014年 | 356篇 |
2013年 | 435篇 |
2012年 | 701篇 |
2011年 | 795篇 |
2010年 | 489篇 |
2009年 | 483篇 |
2008年 | 741篇 |
2007年 | 734篇 |
2006年 | 667篇 |
2005年 | 739篇 |
2004年 | 684篇 |
2003年 | 648篇 |
2002年 | 659篇 |
2001年 | 165篇 |
2000年 | 178篇 |
1999年 | 206篇 |
1998年 | 168篇 |
1997年 | 145篇 |
1996年 | 118篇 |
1995年 | 105篇 |
1994年 | 69篇 |
1993年 | 88篇 |
1992年 | 103篇 |
1991年 | 86篇 |
1990年 | 64篇 |
1989年 | 69篇 |
1988年 | 78篇 |
1987年 | 53篇 |
1986年 | 51篇 |
1985年 | 72篇 |
1984年 | 48篇 |
1983年 | 49篇 |
1982年 | 35篇 |
1981年 | 44篇 |
1980年 | 34篇 |
1979年 | 39篇 |
1978年 | 46篇 |
1977年 | 37篇 |
1975年 | 36篇 |
1974年 | 41篇 |
1971年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Summary. Originally discovered in 1994 by Folkman and coworkers, angiostatin was identified through its antitumor effects in mice and later shown to be a potent inhibitor of angiogenesis. An internal fragment of plasminogen, angiostatin consists of kringle domains that are known to be lysine-binding. The crystal structure of angiostatin was the first multikringle domain-containing structure to be published. This review will focus on what is known about the structure of angiostatin and its implications in function from the current literature. 相似文献
23.
Zusammenfassung Die 20. notfallmedizinische Jahrestagung der Arbeitsgemeinschaft Südwestdeutscher Notärzte (agswn) behandelte auch in diesem Jahr aktuelle berufspolitische Themen. Aktuelle Entwicklungen zur Verbesserung der Arbeitsabläufe in den Leitstellen wurden dargestellt, EDV-gestützte Systeme zur Notrufabfrage, die Vernetzung der Leitstellen und technische Verbesserungen der Leitstellensysteme genannt. Die Gefahren im Rettungsdienst waren ein weiterer Schwerpunkt der Tagung. Eine Ansteckungsgefahr bei Infektionstransporten bei MRSA-Patienten ist bei sachgemäßem Verhalten nicht zu befürchten. Weiterhin wurden die Möglichkeiten des terroristischen Einsatzes von biologischen Waffen realistisch deutlich relativiert. Amoklagen stellen dagegen eine nur schwer kalkulierbare Gefahrensituation dar. Als 3. Themenschwerpunkt wurden die besonderen Herausforderungen der Notfallmedizin im DRG-Zeitalter umrissen. Die Änderung des Einsatzspektrums und die Reduktion von Notarztstandorten erfordert die Bildung von Kompetenzzentren und eine hohe Qualifikation der Notärzte. 相似文献
24.
Bernhard Croissant Fred Rist Ralf Demmel Robert Olbrich 《International journal of psychophysiology》2006,61(2):253-261
Individuals with a family history of alcoholism (FH+) are at risk to develop alcohol problems. In several studies, psychophysiological stress responses were more attenuated by alcohol in FH+ than in FH- subjects. However, it is not clear from these studies, if this stronger stress-response dampening effect of alcohol (SRD) in FH+ subjects is confined to aversive stimuli, or would hold for nonaversive stress conditions as well. Also, male and female FH+ subjects seem to respond differently to the alcohol challenge, but have rarely been directly compared in a SRD paradigm. Participants were 54 female and 63 male healthy adults; 31 women were daughters (DOAs) and 40 men were sons (SOAs) of alcohol-dependent fathers. The remaining 23 women (DONAs) and 23 men (SONAs) had no FH of any alcohol use disorder. The participants took part in two laboratory sessions, one with and one without alcohol. In each session, three stressor procedures were presented. Heart rate is the main dependent variable in this report. SOAs, but not SONAs showed a tendency towards SRD. Among female participants, a strong SRD occurred, but contrary to our expectation only in controls. Stress responses and SRD effects were somewhat stronger in the aversive than in the rewarding task. The extent of alcohol induced SRD was strongly influenced by BAL and the amplitude of the stress response in the no-alcohol condition (multiple regression analysis). Thus, aversive tasks might have the advantage of eliciting stronger stress responses than rewarding tasks, thereby providing better conditions for observing differences in alcohol induced SRD between FH+ and FH- subjects. 相似文献
25.
26.
27.
Imaging of activated microglia with PET and [11C]PK 11195 in corticobasal degeneration. 总被引:3,自引:0,他引:3
Karsten Henkel Jochen Karitzky Michaela Schmid Irina Mader Gerhard Glatting Jürgen W Unger Bernd Neumaier Albert C Ludolph Sven N Reske G Bernhard Landwehrmeyer 《Movement disorders》2004,19(7):817-821
Positron emission tomography (PET) using [(11)C]PK 11195, a ligand for peripheral benzodiazepine receptor binding sites, offers the opportunity to image activated microglia in vivo. This tool may therefore be used to display the occurrence of microglial activation in the course of neurodegeneration. A patient with the clinical diagnosis of corticobasal degeneration (CBD) and left-sided symptoms was studied using fluorodeoxyglucose (FDG) and [(11)C]PK 11195 PET. We found a marked right hemispheric hypometabolism and asymmetric microglial activation in corresponding areas of the basal ganglia and right temporal and parietal cortex. [(11)C]PK 11195 PET suggests involvement of microglial activation in the pathogenesis of CBD. 相似文献
28.
29.
H J Geiger 《American journal of public health》1993,83(3):315-316
30.
Conclusions The peroneal nerves and their blood supply are at risk during high tibial osteotomies. Fixation of nerves by fibrous tissues,
compression by tendinous arcades of the peroneus longus tendon, and narrow passages for nerves crossing dense fibrous septa
are all factors which favor the development of peroneal nerve lesions. Intraoperative soft tissue retraction and pull by retractors
may damage nerves and vessels. The muscle branch for the extensor hallucis longus muscle is particularly at risk during the
fibular osteotomy since it runs directly on the bone. 相似文献