全文获取类型
收费全文 | 6210篇 |
免费 | 364篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 50篇 |
儿科学 | 181篇 |
妇产科学 | 70篇 |
基础医学 | 1130篇 |
口腔科学 | 88篇 |
临床医学 | 515篇 |
内科学 | 1290篇 |
皮肤病学 | 91篇 |
神经病学 | 580篇 |
特种医学 | 341篇 |
外科学 | 762篇 |
综合类 | 27篇 |
一般理论 | 3篇 |
预防医学 | 301篇 |
眼科学 | 289篇 |
药学 | 468篇 |
中国医学 | 4篇 |
肿瘤学 | 395篇 |
出版年
2021年 | 85篇 |
2020年 | 43篇 |
2019年 | 69篇 |
2018年 | 96篇 |
2017年 | 78篇 |
2016年 | 109篇 |
2015年 | 115篇 |
2014年 | 163篇 |
2013年 | 188篇 |
2012年 | 333篇 |
2011年 | 348篇 |
2010年 | 207篇 |
2009年 | 189篇 |
2008年 | 290篇 |
2007年 | 338篇 |
2006年 | 336篇 |
2005年 | 334篇 |
2004年 | 334篇 |
2003年 | 329篇 |
2002年 | 305篇 |
2001年 | 169篇 |
2000年 | 134篇 |
1999年 | 126篇 |
1998年 | 102篇 |
1997年 | 73篇 |
1996年 | 58篇 |
1995年 | 59篇 |
1994年 | 50篇 |
1993年 | 61篇 |
1992年 | 91篇 |
1991年 | 66篇 |
1990年 | 78篇 |
1989年 | 78篇 |
1988年 | 57篇 |
1987年 | 48篇 |
1986年 | 63篇 |
1985年 | 53篇 |
1984年 | 52篇 |
1983年 | 32篇 |
1982年 | 41篇 |
1981年 | 34篇 |
1980年 | 43篇 |
1979年 | 54篇 |
1978年 | 35篇 |
1977年 | 38篇 |
1976年 | 38篇 |
1975年 | 38篇 |
1973年 | 36篇 |
1969年 | 29篇 |
1968年 | 31篇 |
排序方式: 共有6585条查询结果,搜索用时 15 毫秒
1.
Michels Guido Horn Rudolf Helfen Andreas Hagendorff Andreas Jung Christian Hoffmann Beatrice Jaspers Natalie Kinkel Horst Greim Clemens-Alexander Knebel Fabian Bauersachs Johann Busch Hans-Jörg Kiefl Daniel Spiel Alexander O. Marx Gernot Dietrich Christoph F. 《Der Anaesthesist》2022,71(4):307-310
Die Anaesthesiologie - 相似文献
2.
3.
4.
Very preterm children are at increased risk of reduced processing speed at 5 years of age,predicted by typical complications of prematurity and prenatal smoking
下载免费PDF全文
![点击此处可从《Acta paediatrica (Oslo, Norway : 1992)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
5.
Dose-response curves of angiotensin I (AI, 1.0-1000.0 pmol) and angiotensin II (AII, 1.25-1250.00 pmol) were obtained in isolated rat hearts subjected to control conditions, mild hypoxia (PO2 = 145 mm Hg), reoxygenation, ischemic (perfusion pressure = 35 mm Hg) and reperfusion. Both AI and AII caused dose-dependent coronary flow (CF) of 26 +/- 3 and 27 +/- 2%, respectively. The effects of both AI and AII were substantially attenuated during hypoxia, but were fully restored upon reoxygenation. During ischemia, the effect of AII was unaltered while the effect of AI was enhanced compared to the control (P less than 0.05). This enhancement was reversible on reperfusion. Cardiac conversion of AI, calculated from ED50 values for AI and AII, was significantly increased during ischemia (P less than 0.05). Infusion of saralasin (0.5-5.0 micrograms/min) did not increase CF in any of the groups. We conclude that (1) the coronary vasoconstrictive effect of AII is preserved in ischemia but attenuated in hypoxia and (2) cardiac conversion of AI to AII is enhanced in hearts injured by ischemia. 相似文献
6.
Dr. Med. Wolfgang Rutsch Horst Schmutzler 《Cardiovascular and interventional radiology》1986,9(5-6):245-252
Reestablishing myocardial perfusion during evolving myocardial infarction may limit the ultimate extent of infarction if viable
myocardial tissue is present when recanalization of the occluded vessel is achieved. This will result in improved left ventricular
function and decreased mortality. In addition to their therapeutic benefits, recanalization procedures have contributed greatly
to our knowledge of acute myocardial infarction. It has been demonstrated that myocardial infarction most often occurs after
thrombotic occlusion of a coronary artery. This has settled a controversy that has preoccupied cardiologists for decades.
Selective intracoronary administration of fibrinolytic agents is followed by recanalization in approximately 80% of cases.
Therapeutic failures are attributable to occlusion caused by other factors, to inactivation of streptokinase by high antibody
concentrations, and to insufficient concentrations of streptokinase at the thrombus as a results of unfavorable flow conditions.
This study is dedicated to Prof. Dr. Med. Horst Schmutzler on the occasion of his 60th birthday. 相似文献
7.
8.
To determine the relationship between severity of illness and mortality, therapeutic intervention score (TISS) and acute physiology score (APS) were determined on admission to the Surgical Intensive Care Unit (SICU). Patients were divided into survivors and nonsurvivors and differences were compared by chi-square analysis. The 1524 patients admitted to the SICU during a 12-month period had a mean TISS of 3.03 and a mean APS of 13. The average length of stay (LOS) was 3.75 days. Of the 1524 patients, 97 (6.4%) died. The number of nonsurvivors increased with higher TISS and APS scores (P less than 0.001). There were no deaths in the TISS Category 1 patients or in the APS 0-5 group. Mortality rates dramatically increased with APS greater than 20 (P less than 0.001). There were 1286 patients with APS less than 20, and 24 (2%) of these patients died, whereas 73 (31%) of 238 patients with APS greater than 20 died. Nonsurvivors had a mean TISS of 3.6, mean APS of 27, and LOS of 4.88 days, all of which totals were higher than the survivors' totals. In this study population, risk of death was one in three if the APS was greater than 20. These data indicate that TISS and APS scores are effective means of assessing mortality risk in SICU patients. 相似文献
9.
10.
Hans-Jürgen Möller Horst Müller Richard L. Borison Nina R. Schooler Guy Chouinard 《European archives of psychiatry and clinical neuroscience》1995,245(1):45-49
The hypothesis that differences in drug effects of risperidone and haloperidol on negative symptoms in schizophrenia are secondary to effects on positive, extrapyramidal, and depressive symptoms was investigated by means of an analysis of the data from the USA-Canada risperidone double-blind randomized clinical trial of 523 chronic schizophrenic patients. Regression analyses in the total sample and within treatment groups confirmed a strong relationship between changes in negative symptoms and the other variables studied (R2=0.50–0.51,p<0.001). Only depressive symptoms did not contribute significantly to these results (p>0.10). Path analysis showed that the greater mean change (p<0.05) of negative symptoms with risperidone compared to haloperidol could not be fully explained by correlations with favourable effects on positive and extrapyramidal symptoms. The relationship between shift in extrapyramidal symptoms and shift in negative symptoms failed to reach statistical significance; however, there was a clear tendency in the expected direction in both treatment groups. 相似文献