全文获取类型
收费全文 | 227250篇 |
免费 | 57000篇 |
国内免费 | 9679篇 |
专业分类
耳鼻咽喉 | 2881篇 |
儿科学 | 6490篇 |
妇产科学 | 2968篇 |
基础医学 | 33866篇 |
口腔科学 | 7597篇 |
临床医学 | 31894篇 |
内科学 | 45686篇 |
皮肤病学 | 9134篇 |
神经病学 | 20667篇 |
特种医学 | 8264篇 |
外国民族医学 | 92篇 |
外科学 | 30538篇 |
综合类 | 22590篇 |
现状与发展 | 37篇 |
一般理论 | 61篇 |
预防医学 | 14470篇 |
眼科学 | 5957篇 |
药学 | 21582篇 |
130篇 | |
中国医学 | 8958篇 |
肿瘤学 | 20067篇 |
出版年
2024年 | 492篇 |
2023年 | 2274篇 |
2022年 | 5763篇 |
2021年 | 8803篇 |
2020年 | 10342篇 |
2019年 | 15373篇 |
2018年 | 15173篇 |
2017年 | 15701篇 |
2016年 | 16269篇 |
2015年 | 18223篇 |
2014年 | 19801篇 |
2013年 | 19685篇 |
2012年 | 15459篇 |
2011年 | 16199篇 |
2010年 | 16383篇 |
2009年 | 11187篇 |
2008年 | 10306篇 |
2007年 | 9098篇 |
2006年 | 9027篇 |
2005年 | 8349篇 |
2004年 | 6322篇 |
2003年 | 5891篇 |
2002年 | 5271篇 |
2001年 | 4658篇 |
2000年 | 4380篇 |
1999年 | 4056篇 |
1998年 | 2261篇 |
1997年 | 2230篇 |
1996年 | 1734篇 |
1995年 | 1546篇 |
1994年 | 1357篇 |
1993年 | 893篇 |
1992年 | 1297篇 |
1991年 | 1083篇 |
1990年 | 998篇 |
1989年 | 892篇 |
1988年 | 790篇 |
1987年 | 667篇 |
1986年 | 573篇 |
1985年 | 485篇 |
1984年 | 348篇 |
1983年 | 234篇 |
1982年 | 160篇 |
1981年 | 191篇 |
1980年 | 115篇 |
1979年 | 232篇 |
1978年 | 116篇 |
1974年 | 119篇 |
1973年 | 123篇 |
1972年 | 109篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
81.
82.
83.
Context The root of Helicteres angustifolia L. (Sterculiaceae) has been used as folk herbal drug to treat cancer, bacterial infections, inflammatory, and flu in China. However, there is no report on its antidiabetic activity.Objective This study evaluates the antidiabetic activity of ethanol extract from H. angustifolia root.Materials and methods The promoting effect of H. angustifolia root ethanol extract (25, 50, and 100 μg/mL) on glucose uptake was evaluated using HepG2 cell, differentiated C2C12 myotubes, and differentiated 3T3-L1 adipocytes. The antidiabetic activity of the extract was assessed in vivo using STZ-induced diabetic rats by orally administration of the extract (200 and 400?mg/kg b.w.) once per day for 28 d. Blood glucose, TG, TC, TP, HDL-C, UA, BUN, AST, ALT, insulin, and HOMA-IR were analyzed.Results The results showed that the extract increased glucose uptake in C2C12 myotubes and 3T3-L1 adipocytes with an IC50 value of 79.95 and 135.96 μg/mL, respectively. And about 12%, 19%, and 10% (p < 0.05) in HepG2 cells when compared with the control at the concentration of 25, 50, and 100 μg/mL, respectively. After 28 days’ treatment with the extract, significant reduction was observed in blood glucose, HOMA-IR, TC, TG, UA, BUN, AST, and ALT levels, while the levels of TP and HDL cholesterol increased.Discussion and conclusion These results suggest that H. angustifolia root ethanol extract possess potent antidiabetic activity, which is the first report on antidiabetic activity of this plant. 相似文献
84.
85.
86.
Enrique Luengo Izaskun Buendia Cristina Fernndez‐Mendívil Paula Trigo‐Alonso Pilar Negredo Patrycja Michalska Borja Hernndez‐García Cristina Snchez‐Ramos Juan A. Bernal Tsuneya Ikezu Rafael Len Manuela G. Lpez 《Journal of pineal research》2019,67(1)
Alterations in autophagy are increasingly being recognized in the pathogenesis of proteinopathies like Alzheimer's disease (AD). This study was conducted to evaluate whether melatonin treatment could provide beneficial effects in an Alzheimer model related to tauopathy by improving the autophagic flux and, thereby, prevent cognitive decline. The injection of AAV‐hTauP301L viral vectors and treatment/injection with okadaic acid were used to achieve mouse and human ex vivo, and in vivo tau‐related models. Melatonin (10 μmol/L) impeded oxidative stress, tau hyperphosphorylation, and cell death by restoring autophagy flux in the ex vivo models. In the in vivo studies, intracerebroventricular injection of AAV‐hTauP301L increased oxidative stress, neuroinflammation, and tau hyperphosphorylation in the hippocampus 7 days after the injection, without inducing cognitive impairment; however, when animals were maintained for 28 days, cognitive decline was apparent. Interestingly, late melatonin treatment (10 mg/kg), starting once the alterations mentioned above were established (from day 7 to day 28), reduced oxidative stress, neuroinflammation, tau hyperphosphorylation, and caspase‐3 activation; these observations correlated with restoration of the autophagy flux and memory improvement. This study highlights the importance of autophagic dysregulation in tauopathy and how administration of pharmacological doses of melatonin, once tauopathy is initiated, can restore the autophagy flux, reduce proteinopathy, and prevent cognitive decline. We therefore propose exogenous melatonin supplementation or the development of melatonin derivatives to improve autophagy flux for the treatment of proteinopathies like AD. 相似文献
87.
88.
89.
90.
Very preterm children are at increased risk of reduced processing speed at 5 years of age,predicted by typical complications of prematurity and prenatal smoking
下载免费PDF全文
![点击此处可从《Acta paediatrica (Oslo, Norway : 1992)》网站下载免费的PDF全文](/ch/ext_images/free.gif)