全文获取类型
收费全文 | 5163篇 |
免费 | 275篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 55篇 |
儿科学 | 119篇 |
妇产科学 | 66篇 |
基础医学 | 978篇 |
口腔科学 | 92篇 |
临床医学 | 356篇 |
内科学 | 975篇 |
皮肤病学 | 87篇 |
神经病学 | 450篇 |
特种医学 | 307篇 |
外科学 | 684篇 |
综合类 | 29篇 |
一般理论 | 1篇 |
预防医学 | 278篇 |
眼科学 | 154篇 |
药学 | 435篇 |
中国医学 | 6篇 |
肿瘤学 | 374篇 |
出版年
2022年 | 28篇 |
2021年 | 72篇 |
2020年 | 39篇 |
2019年 | 58篇 |
2018年 | 78篇 |
2017年 | 64篇 |
2016年 | 75篇 |
2015年 | 99篇 |
2014年 | 120篇 |
2013年 | 144篇 |
2012年 | 288篇 |
2011年 | 267篇 |
2010年 | 156篇 |
2009年 | 154篇 |
2008年 | 231篇 |
2007年 | 266篇 |
2006年 | 246篇 |
2005年 | 270篇 |
2004年 | 274篇 |
2003年 | 282篇 |
2002年 | 267篇 |
2001年 | 115篇 |
2000年 | 95篇 |
1999年 | 97篇 |
1998年 | 88篇 |
1997年 | 62篇 |
1996年 | 51篇 |
1995年 | 54篇 |
1994年 | 46篇 |
1993年 | 48篇 |
1992年 | 74篇 |
1991年 | 54篇 |
1990年 | 71篇 |
1989年 | 71篇 |
1988年 | 57篇 |
1987年 | 45篇 |
1986年 | 71篇 |
1985年 | 54篇 |
1984年 | 47篇 |
1983年 | 34篇 |
1982年 | 39篇 |
1981年 | 33篇 |
1980年 | 41篇 |
1979年 | 48篇 |
1978年 | 28篇 |
1977年 | 33篇 |
1976年 | 36篇 |
1975年 | 30篇 |
1974年 | 26篇 |
1973年 | 34篇 |
排序方式: 共有5446条查询结果,搜索用时 109 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.
A. Heinig S. H. Heywang-Köbrunner P. Viehweg D. Lampe J. Buchmann R. P. Spielmann 《Der Radiologe》1997,37(9):710-717
Summary
Early recognition of recurrence and work-up of clinically indeterminate lesions may be impaired after reconstruction with
silicone implants due to superimposition of the implant or to scarring. This study was undertaken to evaluate the use of contrast-enhanced
MRI in patients with silicone implant after breast cancer. Contrast-enhanded MRI was offered to 169 patients. Comparative
two- to three-view mammography was also performed in 169 patients, as well as comparative sonography in 144 patients. Conventional
imaging and clinical examination detected only 8/13 recurrences, whereas 12/13 were detected by MRI. One recurrence had been
visible as a strongly enhancing 2-mm dot in a previous examination (2 years before), but was not called. It was therefore
counted as false negative. In addition, multicentricity was detected by MRI alone in two of three cases. MRI correctly diagnosed
scar tissue in all cases with indeterminate findings. However, due to false-positive calls caused by enhancing granulomas
specificity could not be improved. Contrast-enhanded MRI allowed decisive additional information in our study group and improved
the sensitivity significantly (concerning all diagnoses). Contrast-enhanded MRI is recommended in patients with diagnostic
problems or high risk of recurrence after silicone implants.
相似文献
5.
Maternal factors influencing development of embryos from mice superovulated with gonadotropins 总被引:5,自引:0,他引:5
In NMRI mice superovulation with pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) increased mating rate, number of implantation sites, rate of advanced and delayed resorptions, as well as retarded sternebral ossification and cleft palate. On day 3 of gestation in preimplantation embryos, cell number and mitotic index were lower after superovulation than after spontaneous ovulation. However, when preimplantation embryos from superovulated and control females were transferred on day 3 of pregnancy to pseudopregnant recipients (10 embryos per female) no differences could be detected between the two groups of fetuses at term. The results of the embryo transfer experiments indicate that abnormal embryonic development after superovulation with gonadotropins is predominantly induced by effects of the hormone treatment on the maternal uterine environment. 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