全文获取类型
收费全文 | 21966篇 |
免费 | 1536篇 |
国内免费 | 205篇 |
专业分类
耳鼻咽喉 | 247篇 |
儿科学 | 815篇 |
妇产科学 | 515篇 |
基础医学 | 2928篇 |
口腔科学 | 249篇 |
临床医学 | 1819篇 |
内科学 | 4126篇 |
皮肤病学 | 351篇 |
神经病学 | 1632篇 |
特种医学 | 718篇 |
外国民族医学 | 1篇 |
外科学 | 2851篇 |
综合类 | 580篇 |
一般理论 | 24篇 |
预防医学 | 3413篇 |
眼科学 | 549篇 |
药学 | 1357篇 |
2篇 | |
中国医学 | 138篇 |
肿瘤学 | 1392篇 |
出版年
2023年 | 199篇 |
2022年 | 372篇 |
2021年 | 664篇 |
2020年 | 315篇 |
2019年 | 562篇 |
2018年 | 677篇 |
2017年 | 488篇 |
2016年 | 507篇 |
2015年 | 588篇 |
2014年 | 801篇 |
2013年 | 1119篇 |
2012年 | 1617篇 |
2011年 | 1672篇 |
2010年 | 990篇 |
2009年 | 786篇 |
2008年 | 1236篇 |
2007年 | 1307篇 |
2006年 | 1273篇 |
2005年 | 1060篇 |
2004年 | 1013篇 |
2003年 | 949篇 |
2002年 | 815篇 |
2001年 | 471篇 |
2000年 | 381篇 |
1999年 | 319篇 |
1998年 | 135篇 |
1997年 | 122篇 |
1996年 | 96篇 |
1995年 | 93篇 |
1994年 | 91篇 |
1993年 | 58篇 |
1992年 | 203篇 |
1991年 | 199篇 |
1990年 | 219篇 |
1989年 | 227篇 |
1988年 | 205篇 |
1987年 | 210篇 |
1986年 | 174篇 |
1985年 | 170篇 |
1984年 | 132篇 |
1983年 | 90篇 |
1982年 | 53篇 |
1981年 | 49篇 |
1979年 | 98篇 |
1978年 | 58篇 |
1976年 | 46篇 |
1975年 | 70篇 |
1974年 | 65篇 |
1973年 | 58篇 |
1972年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Shylo R. Johnson Dennis Slate Kathleen M. Nelson Amy J. Davis Samual A. Mills John T. Forbes Kurt C. VerCauteren Amy T. Gilbert Richard B. Chipman 《Viruses》2021,13(2)
Since the 1990s, oral rabies vaccination (ORV) has been used successfully to halt the westward spread of the raccoon rabies virus (RV) variant from the eastern continental USA. Elimination of raccoon RV from the eastern USA has proven challenging across targeted raccoon (Procyon lotor) and striped skunk (Mephitis mephitis) populations impacted by raccoon RV. Field trial evaluations of the Ontario Rabies Vaccine Bait (ONRAB) were initiated to expand ORV products available to meet the rabies management goal of raccoon RV elimination. This study describes the continuation of a 2011 trial in West Virginia. Our objective was to evaluate raccoon and skunk response to ORV occurring in West Virginia for an additional two years (2012–2013) at 75 baits/km2 followed by three years (2014–2016) of evaluation at 300 baits/km2. We measured the change in rabies virus-neutralizing antibody (RVNA) seroprevalence in targeted wildlife populations by comparing levels pre- and post-ORV during each year of study. The increase in bait density from 75/km2 to 300/km2 corresponded to an increase in average post-ORV seroprevalence for raccoon and skunk populations. Raccoon population RVNA levels increased from 53% (300/565, 95% CI: 50–57%) to 82.0% (596/727, 95% CI: 79–85%) during this study, and skunk population RVNA levels increased from 11% (8/72, 95% CI: 6–20%) to 39% (51/130, 95% CI: 31–48%). The RVNA seroprevalence pre-ORV demonstrated an increasing trend across study years for both bait densities and species, indicating that multiple years of ORV may be necessary to achieve and maintain RVNA seroprevalence in target wildlife populations for the control and elimination of raccoon RV in the eastern USA. 相似文献
6.
Facial motion is a primary source of social information about other humans. Prior fMRI studies have identified regions of the superior temporal sulcus (STS) that respond specifically to perceived face movements (termed fSTS), but little is known about the nature of motion representations in these regions. Here we use fMRI and multivoxel pattern analysis to characterize the representational content of the fSTS. Participants viewed a set of specific eye and mouth movements, as well as combined eye and mouth movements. Our results demonstrate that fSTS response patterns contain information about face movements, including subtle distinctions between types of eye and mouth movements. These representations generalize across the actor performing the movement, and across small differences in visual position. Critically, patterns of response to combined movements could be well predicted by linear combinations of responses to individual eye and mouth movements, pointing to a parts‐based representation of complex face movements. These results indicate that the fSTS plays an intermediate role in the process of inferring social content from visually perceived face movements, containing a representation that is sufficiently abstract to generalize across low‐level visual details, but still tied to the kinematics of face part movements. 相似文献
7.
8.
This study deals with a series of operations to isolate the micro-cellulose from the palm tree spathe sheath by using a modified chemical method to take into account the low cost and the completion speed and its characterization using X-ray diffraction technique (XRD), infrared spectroscopy (FTIR) and scanning electron microscope coupled with element analyzer (SEM/EDX). The results showed that the extraction method succeeded in obtaining very pure microscopic fibers with a width of 2–10 μm with a crystallinity index equal to 79.21%, containing the two cellulose features Iβ and II, that, the conversion ratio of the first to the second was estimated at 32, 87%. 相似文献
9.
10.
Joseph M. Northey Kate L. Pumpa Clare Quinlan Ashley Ikin Kellie Toohey Disa J. Smee Ben Rattray 《Journal of Science and Medicine in Sport》2019,22(5):580-585