全文获取类型
收费全文 | 124447篇 |
免费 | 49219篇 |
国内免费 | 3973篇 |
专业分类
耳鼻咽喉 | 1759篇 |
儿科学 | 4868篇 |
妇产科学 | 1087篇 |
基础医学 | 21232篇 |
口腔科学 | 5999篇 |
临床医学 | 18948篇 |
内科学 | 30159篇 |
皮肤病学 | 7869篇 |
神经病学 | 15449篇 |
特种医学 | 4210篇 |
外国民族医学 | 34篇 |
外科学 | 19270篇 |
综合类 | 9673篇 |
现状与发展 | 12篇 |
一般理论 | 25篇 |
预防医学 | 7770篇 |
眼科学 | 2662篇 |
药学 | 11089篇 |
41篇 | |
中国医学 | 4393篇 |
肿瘤学 | 11090篇 |
出版年
2024年 | 200篇 |
2023年 | 914篇 |
2022年 | 2129篇 |
2021年 | 4142篇 |
2020年 | 7048篇 |
2019年 | 12427篇 |
2018年 | 11717篇 |
2017年 | 12950篇 |
2016年 | 13514篇 |
2015年 | 14127篇 |
2014年 | 14564篇 |
2013年 | 14874篇 |
2012年 | 7863篇 |
2011年 | 8271篇 |
2010年 | 11560篇 |
2009年 | 7468篇 |
2008年 | 4763篇 |
2007年 | 3766篇 |
2006年 | 3503篇 |
2005年 | 3080篇 |
2004年 | 2569篇 |
2003年 | 2617篇 |
2002年 | 2519篇 |
2001年 | 2187篇 |
2000年 | 1931篇 |
1999年 | 1369篇 |
1998年 | 675篇 |
1997年 | 656篇 |
1996年 | 527篇 |
1995年 | 467篇 |
1994年 | 447篇 |
1993年 | 261篇 |
1992年 | 334篇 |
1991年 | 338篇 |
1990年 | 325篇 |
1989年 | 262篇 |
1988年 | 223篇 |
1987年 | 182篇 |
1986年 | 169篇 |
1985年 | 133篇 |
1984年 | 100篇 |
1983年 | 66篇 |
1982年 | 49篇 |
1981年 | 39篇 |
1980年 | 23篇 |
1979年 | 38篇 |
1977年 | 28篇 |
1975年 | 24篇 |
1974年 | 24篇 |
1972年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
81.
Tien‐Yao Tsai Iat‐Lon Leong Ka‐Shun Cheng Lian‐Ru Shiao Tzu‐Hui Su Kar‐Lok Wong Paul Chan Yuk‐Man Leung 《Fundamental & clinical pharmacology》2019,33(1):52-62
A pathological feature in atherosclerosis is the dysfunction and death of vascular endothelial cells (EC). Oxidized low‐density lipoprotein (LDL), known to accumulate in the atherosclerotic arterial walls, impairs endothelium‐dependent relaxation and causes EC apoptosis. A major bioactive ingredient of the oxidized LDL is lysophosphatidylcholine (LPC), which at higher concentrations causes apoptosis and necrosis in various EC. There is hitherto no report on LPC‐induced cytotoxicity in brain EC. In this work, we found that LPC caused cytosolic Ca2+ overload, mitochondrial membrane potential decrease, p38 activation, caspase 3 activation and eventually apoptotic death in mouse cerebral bEND.3 EC. In contrast to reported reactive oxygen species (ROS) generation by LPC in other EC, LPC did not trigger ROS formation in bEND.3 cells. Pharmacological inhibition of p38 alleviated LPC‐inflicted cell death. We examined whether heparin could be cytoprotective: although it could not suppress LPC‐triggered Ca2+ signal, p38 activation and mitochondrial membrane potential drop, it did suppress LPC‐induced caspase 3 activation and alleviate LPC‐inflicted cytotoxicity. Our data suggest LPC apoptotic death mechanisms in bEND.3 might involve mitochondrial membrane potential decrease and p38 activation. Heparin is protective against LPC cytotoxicity and might intervene steps between mitochondrial membrane potential drop/p38 activation and caspase 3 activation. 相似文献
82.
M.‐Q. Man L. Ye L. Hu S. Jeong P. M. Elias C. Lv 《Clinical and experimental dermatology》2019,44(6):654-657
While therapeutic approaches for psoriasis are widely available, preventive regimens are lacking. We aimed to determine whether improvements in epidermal function could prevent psoriasis relapse. Two self‐controlled cohort studies were designed, enrolling two cohorts of patients with psoriasis (n = 30 and n = 60) to be treated topically with an in‐house‐prepared emollient or ATOPALM® cream applied twice daily to one forearm for 20 and 30 days, respectively, while the same sites on the contralateral arm served as the untreated control. Epidermal function on both arms was assessed prior to and at the end of the trials. Delayed relapse on the treated arm was seen in 54.5% and 71% of patients in the first and second cohort, respectively. The time of psoriatic relapse correlated with the extent of abnormalities in baseline epidermal function. These results suggest that improvements in epidermal function with topical emollients can prevent/attenuate the development of psoriasis. 相似文献
83.
84.
85.
86.
Luis Veloza Cristina Teixido Natalia Castrejon Fina Climent Ana Carri Marta Marginet Davide Soldini Blanca Gonzlez‐Farr Inmaculada Ribera‐Cortada Armando Lopez‐Guillermo Eva Gonzlez‐Barca Adriana Sierra Mileyka Herrera Cndida Gmez Adriana Garcia Olga Balagu Elias Campo Antonio Martinez 《Histopathology》2019,75(6):799-812
87.
Leyi Wang Saraswathi Lanka Debbie Cassout Nohra E. Mateus‐Pinilla Ganwu Li William C. Wilson Dongwan Yoo Paul Shelton Richard L. Fredrickson 《Transboundary and Emerging Diseases》2019,66(5):1809-1820
First described in 1955 in New Jersey, epizootic haemorrhagic disease (EHD) causes a severe clinical disease in wild and domestic ruminants worldwide. Epizootic haemorrhagic disease outbreaks occur in deer populations each year from summer to late autumn. The etiological agent is EHD virus (EHDV) which is a double‐stranded segmented icosahedral RNA virus. EHD virus utilizes point mutations and reassortment strategies to maintain viral fitness during infection. In 2018, EHDV serotype 2 was predominantly detected in deer in Illinois. Whole genome sequencing was conducted for two 2018 EHDV2 isolates (IL41747 and IL42218) and the sequence analyses indicated that IL42218 was a reassortant between different serotypes whereas IL41747 was a genetically stable strain. Our data suggest that multiple strains contribute to outbreaks each year. 相似文献
88.
89.
目的 通过阿霉素(Dox)复制大鼠慢性心力衰竭(CHF)模型,观察Liguzinediol对CHF大鼠心功能的影响。方法 通过血流动力学观察Liguzinediol对Dox(腹腔注射,2 mg/kg)诱导的CHF大鼠左心室内压最大上升/下降速率(±dp/dtmax)、左心室内压(LVSP)、动脉收缩压(ASP)、动脉舒张压(ADP)和心率(HR)的变化;观察Liguzinediol对血清一氧化氮(NO)、一氧化氮合成酶(NOS)、超氧化物歧化酶(SOD)、肿瘤坏死因子-α(TNF-α)和白细胞介素-6(IL-6)以及血浆中丙二醛(MDA)的影响。结果 Liguzinediol能增加LVSP、+dp/dtmax、ASP、ADP、AP、HR,降低-dp/dtmax(P<0.05~0.01);降低NO、iNOS以及MDA的浓度,同时增强了SOD的活性(P<0.05~0.01);抑制IL-6和TNF-α的生成(P<0.05~0.01)。结论 Liguzinediol可明显改善Dox诱导的CHF大鼠血流动力学指标,减少模型大鼠炎症因子的释放以及抑制氧自由基的生成。 相似文献
90.