全文获取类型
收费全文 | 18987篇 |
免费 | 1435篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 139篇 |
儿科学 | 458篇 |
妇产科学 | 342篇 |
基础医学 | 2605篇 |
口腔科学 | 585篇 |
临床医学 | 2131篇 |
内科学 | 4467篇 |
皮肤病学 | 242篇 |
神经病学 | 1776篇 |
特种医学 | 714篇 |
外科学 | 2466篇 |
综合类 | 319篇 |
一般理论 | 47篇 |
预防医学 | 1620篇 |
眼科学 | 554篇 |
药学 | 1046篇 |
中国医学 | 14篇 |
肿瘤学 | 978篇 |
出版年
2021年 | 278篇 |
2020年 | 177篇 |
2019年 | 254篇 |
2018年 | 272篇 |
2017年 | 211篇 |
2016年 | 269篇 |
2015年 | 335篇 |
2014年 | 444篇 |
2013年 | 842篇 |
2012年 | 1006篇 |
2011年 | 1067篇 |
2010年 | 629篇 |
2009年 | 586篇 |
2008年 | 941篇 |
2007年 | 1033篇 |
2006年 | 1056篇 |
2005年 | 1077篇 |
2004年 | 1059篇 |
2003年 | 965篇 |
2002年 | 1030篇 |
2001年 | 184篇 |
2000年 | 133篇 |
1999年 | 201篇 |
1998年 | 229篇 |
1997年 | 219篇 |
1996年 | 205篇 |
1995年 | 182篇 |
1994年 | 157篇 |
1993年 | 173篇 |
1992年 | 144篇 |
1991年 | 130篇 |
1990年 | 128篇 |
1989年 | 138篇 |
1988年 | 118篇 |
1987年 | 127篇 |
1986年 | 121篇 |
1985年 | 154篇 |
1984年 | 185篇 |
1983年 | 158篇 |
1982年 | 209篇 |
1981年 | 200篇 |
1980年 | 195篇 |
1979年 | 123篇 |
1978年 | 133篇 |
1977年 | 132篇 |
1976年 | 142篇 |
1975年 | 132篇 |
1974年 | 115篇 |
1973年 | 97篇 |
1972年 | 87篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
Anthony M. Norcia Russell D. Hamer Arthur Jampolsky Deborah Orel-Bixler 《Vision research》1995,35(23-24)
Monocular oscillatory-motion visual evoked potentials (VEPs) were measured in prospective and retrospective groups of infantile esotropia patients who had been aligned surgically at different ages. A nasalward-temporal response bias that is present prior to surgery was reduced below pre-surgery levels in the prospective group. Patients in the retrospective group who had been aligned before 2 yr of age showed lower levels of response asymmetry than those who were aligned after age 2. The data imply that binocular motion processing mechanisms in infantile esotropia patients are capable of some degree of recovery, and that this plasticity is restricted to a critical period of visual development. 相似文献
73.
74.
Christine N Vidal Rob Nicolson Timothy J DeVito Kiralee M Hayashi Jennifer A Geaga Dick J Drost Peter C Williamson Nagalingam Rajakumar Yihong Sui Rebecca A Dutton Arthur W Toga Paul M Thompson 《Neuropsychopharmacology》2006,60(3):218-225
BACKGROUND: Volumetric studies have reported reductions in the size of the corpus callosum (CC) in autism, but the callosal regions contributing to this deficit have differed among studies. In this study, a computational method was used to detect and map the spatial pattern of CC abnormalities in male patients with autism. METHODS: Twenty-four boys with autism (aged 10.0 +/- 3.3 years) and 26 control boys (aged 11.0 +/- 2.5 years) underwent a magnetic resonance imaging (MRI) scan at 3 Tesla. Total and regional areas of the CC were determined using traditional morphometric methods. Three-dimensional (3D) surface models of the CC were also created from the MRI scans. Statistical maps were created to visualize morphologic variability of the CC and to localize regions of callosal thinning in autism. RESULTS: Traditional morphometric methods detected a significant reduction in the total callosal area and in the anterior third of the CC in patients with autism; however, 3D maps revealed significant reductions in both the splenium and genu of the CC in patients. CONCLUSIONS: Statistical maps of the CC revealed callosal deficits in autism with greater precision than traditional morphometric methods. These abnormalities suggest aberrant connections between cortical regions, which is consistent with the hypothesis of abnormal cortical connectivity in autism. 相似文献
75.
76.
Allan J. MacKenzie-Graham Erh-Fang Lee Ivo D. Dinov Heng Yuan †Russell E. Jacobs Arthur W. Toga 《Epilepsia》2007,48(S4):75-81
Summary: Naturally occurring mutants and genetically manipulated strains of mice are widely used to model a variety of human diseases. Atlases are an invaluable aid in understanding the impact of such manipulations by providing a standard for comparison and to facilitate the integration of anatomic, genetic, and physiologic observations from multiple subjects and experiments. We have developed digital atlases of the C57BL/6J mouse brain (adult and neonate) as comprehensive frameworks for storing and accessing the myriad types of information about the mouse brain. Along with raw and annotated images, these contain database management systems and a set of tools for comparing information from different techniques and different animals. Each atlas establishes a canonical representation of the mouse brain and provides the tools for the manipulation and analysis of new data. We describe both these atlases and discuss how they may be put to use in organizing and analyzing data from mouse models of epilepsy. 相似文献
77.
78.
79.
80.
Zhiqiang Li Arthur F Gmitro Ali Bilgin Maria I Altbach 《Magnetic resonance in medicine》2007,57(6):1047-1057
Three-point Dixon techniques achieve good lipid-water separation by estimating the phase due to field inhomogeneities. Recently it was demonstrated that the combination of an iterative algorithm (iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL)) with a fast spin-echo (FSE) three-point Dixon method yielded robust lipid-water decomposition. As an alternative to FSE, the gradient- and spin-echo (GRASE) technique has been developed for efficient data collection. In this work we present a method for lipid-water separation by combining IDEAL with the GRASE technique. An approach to correct for errors in the lipid-water decomposition caused by phase distortions due to the switching of the readout gradient polarities inherent to GRASE is presented. The IDEAL-GRASE technique is demonstrated in phantoms and in vivo for various applications, including pelvic, musculoskeletal, and (breath-hold) cardiac imaging. 相似文献