全文获取类型
收费全文 | 51647篇 |
免费 | 3664篇 |
国内免费 | 124篇 |
专业分类
耳鼻咽喉 | 643篇 |
儿科学 | 1304篇 |
妇产科学 | 980篇 |
基础医学 | 6541篇 |
口腔科学 | 1025篇 |
临床医学 | 5737篇 |
内科学 | 10093篇 |
皮肤病学 | 813篇 |
神经病学 | 4671篇 |
特种医学 | 2109篇 |
外科学 | 7944篇 |
综合类 | 836篇 |
一般理论 | 57篇 |
预防医学 | 5035篇 |
眼科学 | 743篇 |
药学 | 3643篇 |
1篇 | |
中国医学 | 46篇 |
肿瘤学 | 3214篇 |
出版年
2023年 | 321篇 |
2022年 | 608篇 |
2021年 | 1332篇 |
2020年 | 817篇 |
2019年 | 1258篇 |
2018年 | 1516篇 |
2017年 | 1061篇 |
2016年 | 1062篇 |
2015年 | 1253篇 |
2014年 | 1860篇 |
2013年 | 2530篇 |
2012年 | 3595篇 |
2011年 | 3672篇 |
2010年 | 1990篇 |
2009年 | 1826篇 |
2008年 | 3082篇 |
2007年 | 3048篇 |
2006年 | 2816篇 |
2005年 | 2861篇 |
2004年 | 2723篇 |
2003年 | 2482篇 |
2002年 | 2312篇 |
2001年 | 790篇 |
2000年 | 827篇 |
1999年 | 774篇 |
1998年 | 535篇 |
1997年 | 426篇 |
1996年 | 457篇 |
1995年 | 337篇 |
1994年 | 310篇 |
1993年 | 284篇 |
1992年 | 518篇 |
1991年 | 479篇 |
1990年 | 470篇 |
1989年 | 432篇 |
1988年 | 374篇 |
1987年 | 375篇 |
1986年 | 324篇 |
1985年 | 339篇 |
1984年 | 334篇 |
1983年 | 287篇 |
1982年 | 199篇 |
1981年 | 148篇 |
1980年 | 161篇 |
1979年 | 220篇 |
1978年 | 168篇 |
1975年 | 152篇 |
1974年 | 151篇 |
1973年 | 151篇 |
1972年 | 154篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
13.
A general overview of the literature concerning the development of diabetic neuropathic arthropathy is discussed. A case report is presented dealing with spontaneous fractures of the lesser metatarsal in a patient with an amputated hallux and peripheral neuropathy secondary to diabetes mellitus. 相似文献
14.
15.
Naiquan Zheng Rafael F Escamilla Glenn S Fleisig Kevin E Wilk James R Andrews 《中华骨科杂志》2002,29(1):697-700
结果 髌股关节的压力与应力随膝关节屈曲角度的增加而升高,随膝关节屈曲角度的减小而降低(图3~8).不同膝关节屈曲角度下弓步变化和跨步变化的髌股关节压力见表1. 相似文献
16.
17.
18.
K J Meador J L Thompson D W Loring A M Murro D W King B B Gallagher G P Lee J R Smith H F Flanigin 《Neurology》1991,41(6):869-872
Although there has been extensive examination of the behavioral and physiologic correlates of hippocampal theta activity in animals, the human literature consists of a single case study. We investigated the differential effects of four behavioral states on human hippocampal theta activity in 16 epilepsy surgery patients. Behavioral conditions included resting eyes closed (RC), resting eyes open (RO), eyes open with auditory word activation (AW), and eyes open with visuospatial activation (VS). Hippocampal theta activity decreased during both RO and VS compared to both RC and AW. There were reciprocal changes in delta activity. Comparisons of RO to VS and of RC to AW were nonsignificant. The results demonstrate state-specific changes in human hippocampal theta and are consistent with the animal literature that relates hippocampal theta to sensorimotor integration and forebrain volitional mechanisms. 相似文献
19.
Regula E Egli Thomas L Kash Kevin Choo Valentina Savchenko Robert T Matthews Randy D Blakely Danny G Winder 《Neuropsychopharmacology》2005,30(4):657-668
The bed nucleus of the stria terminalis (BNST) and its adrenergic input are key components in stress-induced reinstatement and maintenance of drug use. Intra-BNST injections of either beta-adrenergic receptor (beta-AR) antagonists or alpha2-adrenergic receptor (alpha2-AR) agonists can inhibit footshock-induced reinstatement and maintenance of cocaine- and morphine-seeking. Using electrophysiological recording methods in an in vitro slice preparation from C57/Bl6j adult male mouse BNST, we have examined the effects of adrenergic receptor activation on excitatory synaptic transmission in the lateral dorsal supracommissural BNST (dBNST) and subcommissural BNST (vBNST). Alpha2-AR activation via UK-14,304 (10 microM) results in a decrease in excitatory transmission in both dBNST and vBNST, an effect predominantly dependent upon the alpha2A-AR subtype. Beta-AR activation via isoproterenol (1 microM) results in an increase in excitatory transmission in dBNST, but not in vBNST. Consistent with the work with receptor subtype specific agonists, application of the endogenous ligand norepinephrine (NE, 100 microM) elicits two distinct effects on glutamatergic transmission. In dBNST, NE elicits an increase in transmission (62% of dBNST NE experiments) or a decrease in transmission (38% of dBNST NE experiments). In vBNST, NE elicits a decrease in transmission in 100% of the experiments. In dBNST, the NE-induced increase in synaptic transmission is blocked by beta1/beta2- and beta2-, but not beta1-specific antagonists. In addition, this increase is also reduced by the alpha2-AR antagonist yohimbine and is absent in the alpha2A-AR knockout mouse. In vBNST, the NE-induced decrease in synaptic transmission is markedly reduced in the alpha2A-AR knockout mouse. Further experiments demonstrate that the actions of NE on glutamatergic transmission can be correlated with beta-AR function. 相似文献
20.