全文获取类型
收费全文 | 2112篇 |
免费 | 317篇 |
国内免费 | 42篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 106篇 |
妇产科学 | 33篇 |
基础医学 | 155篇 |
口腔科学 | 27篇 |
临床医学 | 334篇 |
内科学 | 699篇 |
皮肤病学 | 67篇 |
神经病学 | 208篇 |
特种医学 | 290篇 |
外科学 | 242篇 |
综合类 | 33篇 |
预防医学 | 84篇 |
眼科学 | 33篇 |
药学 | 61篇 |
中国医学 | 1篇 |
肿瘤学 | 84篇 |
出版年
2024年 | 10篇 |
2023年 | 55篇 |
2022年 | 15篇 |
2021年 | 38篇 |
2020年 | 96篇 |
2019年 | 21篇 |
2018年 | 100篇 |
2017年 | 78篇 |
2016年 | 75篇 |
2015年 | 73篇 |
2014年 | 114篇 |
2013年 | 121篇 |
2012年 | 71篇 |
2011年 | 69篇 |
2010年 | 86篇 |
2009年 | 121篇 |
2008年 | 74篇 |
2007年 | 59篇 |
2006年 | 60篇 |
2005年 | 58篇 |
2004年 | 31篇 |
2003年 | 37篇 |
2002年 | 38篇 |
2001年 | 41篇 |
2000年 | 27篇 |
1999年 | 35篇 |
1998年 | 82篇 |
1997年 | 99篇 |
1996年 | 81篇 |
1995年 | 70篇 |
1994年 | 50篇 |
1993年 | 53篇 |
1992年 | 31篇 |
1991年 | 22篇 |
1990年 | 30篇 |
1989年 | 57篇 |
1988年 | 46篇 |
1987年 | 30篇 |
1986年 | 24篇 |
1985年 | 26篇 |
1984年 | 20篇 |
1983年 | 11篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1971年 | 9篇 |
排序方式: 共有2471条查询结果,搜索用时 15 毫秒
1.
2.
3.
C T Gan G P McCann J T Marcus S A van Wolferen J W Twisk A Boonstra P E Postmus A Vonk-Noordegraaf 《The European respiratory journal》2006,28(6):1190-1194
The aim of the current study was to investigate whether alterations in N-terminal pro brain natriuretic peptide (NT-proBNP) reflect changes in right ventricular structure and function in pulmonary hypertension patients during treatment. The study consisted of 30 pulmonary hypertension patients; 15 newly diagnosed and 15 on long-term treatment. NT-proBNP, right heart catheterisation and cardiac magnetic resonance imaging measurements were performed, at baseline and follow-up. There were no significant differences between newly diagnosed patients and those on treatment at baseline or follow-up with respect to NT-proBNP, haemodynamics and right ventricular parameters. Relative changes in NT-proBNP during treatment were correlated to the relative changes in right ventricular end-diastolic volume index (r = 0.59), right ventricular mass index (r = 0.62) and right ventricular ejection fraction (r = -0.81). N-terminal pro brain natriuretic peptide measurements reflect changes in magnetic resonance imaging-measured right ventricular structure and function in pulmonary hypertension patients. An increase in N-terminal pro brain natriuretic peptide over time reflects right ventricular dilatation concomitant to hypertrophy and deterioration of systolic function. 相似文献
4.
5.
6.
7.
J. G. Boonstra Johan W. van der Pijl Yves F. C. Smets Herman H. P. J. Lemkes Jan Ringers Leendert A. van Es F. J. van der Woude Jan A. Bruijn 《Transplant international》1997,10(6):451-456
To examine the incidence of interstitial and vascular
rejection in pancreas allografts and its impact on graft survival, we studied 36 percutaneous pancreas biopsies and 10 pancreas
transplantectomy specimens from 32 patients who had undergone simultaneous pancreas-kidney transplantation. Interstitial rejection
(IR) was predominantly found in the biopsies, while vascular rejection (VR) was most prominent in the transplantectomies.
Pancreas graft survival was significantly decreased for pancreas grafts that had suffered from vascular rejection when compared
to those with only interstitial rejection. Potential rejection markers, i. e., serum amylase, glucose, creatinine, and urinary
amylase, did not correlate with histological signs of rejection, although increased levels of serum amylase were, in all but
one case, associated with rejection.We conclude that a percutaneous pancreas biopsy remains the most reliable method to determine
pancreas rejection, and that by distinguishing between IR andVR, a pancreas biopsy may provide important diagnostic as well
as prognostic information.
Received: 6 March 1997 Received after revision: 5 June 1997 Accepted: 30 June 1997 相似文献
8.
9.
10.
Ralls PW; Johnson MB; Kanel G; Dobalian DM; Colletti PM; Boswell WD Jr; Radin DR; Halls JM 《Radiology》1986,161(2):451-454
FM sonography - a signal-processing technique that uses frequency and phase information as well as amplitude data - shows promise in evaluation of patients with diffuse liver disease. In a prospective blinded review of 37 patients with biopsy-proved liver disease and 42 healthy volunteers, FM sonography was clearly superior to traditional amplitude-based (AM) sonography in distinguishing healthy from diseased subjects. Statistically significant differences were seen in accuracy (FM, 98.7%; AM, 84.8%), sensitivity (FM, 97.3%; AM, 70.3%), and negative predictive value (FM, 97.7%; AM, 78.8%). Our data also suggest that current FM sonographic techniques cannot differentiate among histologic findings associated with different hepatic parenchymal abnormalities. It is unclear, therefore, whether FM imaging can reduce the numbers of patients who require biopsy for diagnosis or the frequency of biopsy procedures in patients with known disease. 相似文献