全文获取类型
收费全文 | 2893篇 |
免费 | 153篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 49篇 |
儿科学 | 225篇 |
妇产科学 | 45篇 |
基础医学 | 296篇 |
口腔科学 | 112篇 |
临床医学 | 211篇 |
内科学 | 662篇 |
皮肤病学 | 80篇 |
神经病学 | 150篇 |
特种医学 | 103篇 |
外科学 | 534篇 |
综合类 | 46篇 |
预防医学 | 91篇 |
眼科学 | 54篇 |
药学 | 210篇 |
中国医学 | 13篇 |
肿瘤学 | 183篇 |
出版年
2023年 | 24篇 |
2022年 | 40篇 |
2021年 | 95篇 |
2020年 | 59篇 |
2019年 | 96篇 |
2018年 | 102篇 |
2017年 | 91篇 |
2016年 | 83篇 |
2015年 | 87篇 |
2014年 | 123篇 |
2013年 | 154篇 |
2012年 | 237篇 |
2011年 | 225篇 |
2010年 | 133篇 |
2009年 | 111篇 |
2008年 | 183篇 |
2007年 | 167篇 |
2006年 | 163篇 |
2005年 | 158篇 |
2004年 | 118篇 |
2003年 | 103篇 |
2002年 | 81篇 |
2001年 | 60篇 |
2000年 | 52篇 |
1999年 | 45篇 |
1998年 | 24篇 |
1997年 | 13篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 5篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 18篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 25篇 |
1987年 | 8篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 4篇 |
1975年 | 8篇 |
1974年 | 12篇 |
1973年 | 7篇 |
1970年 | 5篇 |
1969年 | 4篇 |
1968年 | 4篇 |
排序方式: 共有3064条查询结果,搜索用时 625 毫秒
61.
62.
Jones Brian E. Allegretti Andrew S. Pose Elisa Mara Kristin C. Ufere Nneka N. Avitabile Emma Shah Vijay H. Kamath Patrick S. Gins Pere Simonetto Douglas A. 《Digestive diseases and sciences》2022,67(2):697-707
Digestive Diseases and Sciences - Acute kidney injury is seen in approximately 30% of patients with severe alcohol-associated hepatitis (AH) and is associated with increased mortality. Controversy... 相似文献
63.
To determine the diurnal pattern of cardiac autonomic tone in acute myocardial infarction (AMI), this study examined the power spectrum of heart rate (HR) variability in 24 patients during a single 24-hour segment within 4 days of AMI. Patients were nonrandomly allocated to a group (n = 14) without autonomic drugs and to a group (n = 10) already receiving beta blockers at the time of AMI. With use of autoregressive modeling, the power spectrum of HR variability was computed from continuous 1-hour electrocardiographic segments recorded at equally spaced intervals; 7 to 8 A.M., 3 to 4 P.M., and 11 to 12 P.M. All patients were supine, awake and pain free during recordings. There were no differences in HR, HR variance or the low-frequency peak power (0.06 to 0.1 Hz) from one temporal sequence to another. For the patients not taking beta blockers, the high-frequency peak power (0.2 to 0.36 Hz) or vagal component increased significantly from 3 P.M. to 11 P.M. (28 +/- 11 to 45 +/- 20 beats/min2.Hz-1, p less than 0.01). There was a significant decrease in the low- to high-frequency peak power and area ratios from 3 P.M. to 11 P.M. All power spectral parameters in the patients taking beta blockers remained unchanged over 24 hours. There was significantly heightened vagal modulation of sinus node activity in those receiving beta blockers, especially at 7 A.M. and 3 P.M. The data suggest that under steady-state wakeful conditions in the early recovery phase after an AMI, vagal tone is more pronounced during the late evening hours with a possible shift to relative sympathetic dominance during early morning and midafternoon hours.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
64.
NPM-ALK transgenic mice spontaneously develop T-cell lymphomas and plasma cell tumors 总被引:19,自引:7,他引:19
Chiarle R Gong JZ Guasparri I Pesci A Cai J Liu J Simmons WJ Dhall G Howes J Piva R Inghirami G 《Blood》2003,101(5):1919-1927
65.
Jasmohan S. Bajaj Jacqueline G. O’Leary Puneeta Tandon Florence Wong Patrick S. Kamath Scott W. Biggins Guadalupe Garcia-Tsao Jennifer Lai Michael B. Fallon Paul J. Thuluvath Hugo E. Vargas Benedict Maliakkal Ram M. Subramanian Leroy R. Thacker K. Rajender Reddy 《Clinical gastroenterology and hepatology》2021,19(3):565-572.e5
66.
67.
The role of endoscopic ultrasound (EUS) in the diagnosis of biliary strictures is well established, and emerging evidence
suggests it may also play a therapeutic role. Differentiating between benign and malignant causes of biliary strictures can
be challenging, but EUS can aid in their diagnosis and may predict resectability. The diagnostic yield of EUS combined with
fine-needle aspiration (FNA) is excellent, especially in distal bile duct strictures, and far surpasses endoscopic retrograde
cholangiopancreatography (ERCP) with brushings. Intraductal ultrasound may add to the diagnostic sensitivity of ERCP with
brushings when no mass is seen on cross-sectional imaging or EUS, or when EUS with FNA is negative and suspicion of cancer
persists. EUS-guided cholangiography is an emerging technique that may aid biliary decompression when ERCP has failed or is
not possible; however, new therapeutic echoendoscopes or accessories are needed before the use of this technique can become
more widespread. 相似文献
68.
69.
With increasing life expectancy and the older mean age of the general population, the prevalence of atrial fibrillation is likely to increase, making this arrhythmia an even more important public health problem, especially in the elderly. While atrial fibrillation is increasingly common in the elderly, paradoxically, the data on intervention trials in atrial fibrillation among the elderly are limited. When considering anticoagulation in the elderly patient with atrial fibrillation, the following five questions should be addressed. 1) Is there a definite indication (for example, atrial fibrillation plus risk factor[s])? 2) Is there a high risk of bleeding or strong contraindication against anticoagulation? 3) Will concurrent medication or disease states significantly increase bleeding risk or interfere with anticoagulation control? 4) Is drug compliance and attendance at anticoagulant clinic for monitoring likely to be a problem? 5) Will there be regular review of the patient, especially with regard to risks and benefits of anticoagulation? Careful and continuing evaluation of the elderly patient with atrial fibrillation is necessary to ensure that the risks of bleeding do not outweigh the benefits from anticoagulation. 相似文献