全文获取类型
收费全文 | 75587篇 |
免费 | 4604篇 |
国内免费 | 134篇 |
专业分类
耳鼻咽喉 | 855篇 |
儿科学 | 2411篇 |
妇产科学 | 1947篇 |
基础医学 | 11612篇 |
口腔科学 | 2357篇 |
临床医学 | 6432篇 |
内科学 | 15620篇 |
皮肤病学 | 1365篇 |
神经病学 | 7367篇 |
特种医学 | 2931篇 |
外国民族医学 | 24篇 |
外科学 | 10409篇 |
综合类 | 286篇 |
现状与发展 | 1篇 |
一般理论 | 67篇 |
预防医学 | 6158篇 |
眼科学 | 1181篇 |
药学 | 3946篇 |
中国医学 | 74篇 |
肿瘤学 | 5282篇 |
出版年
2023年 | 332篇 |
2022年 | 598篇 |
2021年 | 1092篇 |
2020年 | 779篇 |
2019年 | 1143篇 |
2018年 | 1369篇 |
2017年 | 1170篇 |
2016年 | 1444篇 |
2015年 | 1529篇 |
2014年 | 2007篇 |
2013年 | 2676篇 |
2012年 | 4028篇 |
2011年 | 4105篇 |
2010年 | 2177篇 |
2009年 | 2318篇 |
2008年 | 3624篇 |
2007年 | 3814篇 |
2006年 | 3667篇 |
2005年 | 3541篇 |
2004年 | 3045篇 |
2003年 | 2947篇 |
2002年 | 2596篇 |
2001年 | 2534篇 |
2000年 | 2483篇 |
1999年 | 2245篇 |
1998年 | 917篇 |
1997年 | 799篇 |
1996年 | 752篇 |
1995年 | 624篇 |
1994年 | 580篇 |
1993年 | 565篇 |
1992年 | 1511篇 |
1991年 | 1478篇 |
1990年 | 1442篇 |
1989年 | 1284篇 |
1988年 | 1212篇 |
1987年 | 1099篇 |
1986年 | 1088篇 |
1985年 | 1022篇 |
1984年 | 709篇 |
1983年 | 571篇 |
1982年 | 327篇 |
1981年 | 334篇 |
1979年 | 584篇 |
1978年 | 354篇 |
1977年 | 322篇 |
1975年 | 345篇 |
1974年 | 375篇 |
1973年 | 356篇 |
1972年 | 369篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
Die Unfallchirurgie - Zur Diagnostik von Schultergelenkerkrankungen wird routinemäßig die Magnetresonanztomographie (MRT) durchgeführt. Diese kann entsprechend der klinischen... 相似文献
14.
15.
16.
Steven V Koenen Anjoke J M Huisjes Jules Dings Yolanda van der Graaf Gerard H A Visser Hein W Bruinse 《The journal of maternal-fetal & neonatal medicine》2006,19(2):93-99
OBJECTIVE: To determine if there is a diurnal pattern in the clinical symptoms of HELLP (Hemolysis, Elevated Liver enzymes, Low Platelets) syndrome. STUDY DESIGN: A retrospective study was performed in 134 pregnancies complicated by HELLP syndrome. The medical records were reviewed to describe each HELLP episode. Time of day was divided into three periods, day, evening, and night. The following parameters were categorized according to the time of day: onset of symptoms, consultation by the doctor, initial blood sampling, diagnosis and decrease of symptoms. Biochemical parameters at clinical presentation and consecutive changes within 24 h were recorded. RESULTS: In 65 pregnancies 77 HELLP episodes were well documented. Times of onset of symptoms and consultation by the doctor were significantly higher during the evening and night (p < 0.001), whereas times of diagnosis and decrease of symptoms occurred significantly more during the day (p < 0.001). In only 49.3% of the cases were diagnostic laboratory criteria met at clinical presentation. This was mainly due to platelet values in excess of 100 x 10(9)/l. Several hours later (median 8 h, range 2-23) the decrease in platelets occurred. CONCLUSIONS: A diurnal pattern exists in the clinical symptoms of HELLP syndrome that is characterized by an exacerbation during the night and recovery during the day. There is a considerable delay between the onset of symptoms and the fulfillment of diagnostic laboratory criteria. 相似文献
17.
18.
Setting goals to maintain hope. 总被引:3,自引:0,他引:3
19.
Paul C. Willems Leon Elmans Patricia G. Anderson Wilco C. H. Jacobs Dick B. van der Schaaf Marinus de Kleuver 《European spine journal》2006,15(10):1487-1494
The results of lumbar fusion in chronic low back pain (LBP) patients vary considerably, and there is a need for proper patient selection. Lumbosacral orthoses have been widely used to predict outcome, however, with little scientific support. The aim of the present study was to determine the value of a pantaloon cast test in selecting chronic LBP patients for lumbar fusion or conservative management. First, a systematic review of the literature was carried out in which two independent reviewers identified studies in Medline, Cochrane and Current Contents databases. Three papers met the selection criteria. In the only study with a control group, a significantly better outcome after fusion compared to conservative treatment was found in patients who reported significant pain relief while in a cast (i.e. a positive cast test). The results of lumbar fusion, however, were not significantly different for patients with a positive and those with a negative cast test. In addition to the review, a clinical cohort study of 257 LBP patients, who had been allocated to either lumbar fusion or conservative management by a temporary external transpedicular fixation trial, was performed. Prior to allocation, all had undergone a pantaloon cast test. Patients with no history of prior spine surgery and with a positive pantaloon cast test had a better outcome after lumbar fusion than those treated conservatively (P = 0.002, χ
2 test). In patients with previous spine operations the outcomes were poor and the test was of no value. From the literature and the present patient cohort, it was concluded that only in chronic LBP patients without prior spine surgery, a pantaloon cast test with substantial pain relief suggests a favorable outcome of lumbar fusion compared to conservative management. The test has no value in patients who have had previous spine surgery. 相似文献
20.
C. Ballet G. Roussey-Kesler J.-T. Aubin S. Brouard M. Giral P. Miqueu S. Louis S. van der Werf J.-P. Soulillou 《American journal of transplantation》2006,6(11):2796-2801
Rare kidney allograft recipients enjoy unaltered graft function years after interruption of their immunosuppressive treatment. To assess the extent to which this state of 'operational tolerance' (TOL) is specific to the graft and not the result of a global immunodeficiency, we analyzed the response of such patients following influenza vaccination. Hemagglutination inhibition titers and frequency of IFNgamma-secreting T cells were measured before 1 and 3 months after vaccination. The proportion of healthy volunteers (HV) responding to vaccine was significantly higher than that of immunosuppressed (IS) patients. Three 'TOL' patients presented a humoral response similar to that of HV, whereas the two others had a poor response, like the IS recipients. Although the small number of patients does not allow for definitive conclusions to be made, these data suggest that the status of tolerance may be heterogeneous, with some patients with a global immunodeficiency and others with an adapted response to vaccination. 相似文献