全文获取类型
收费全文 | 57680篇 |
免费 | 3818篇 |
国内免费 | 674篇 |
专业分类
耳鼻咽喉 | 1108篇 |
儿科学 | 823篇 |
妇产科学 | 1041篇 |
基础医学 | 8740篇 |
口腔科学 | 1389篇 |
临床医学 | 5009篇 |
内科学 | 11904篇 |
皮肤病学 | 1855篇 |
神经病学 | 4271篇 |
特种医学 | 3198篇 |
外科学 | 7360篇 |
综合类 | 657篇 |
现状与发展 | 3篇 |
一般理论 | 23篇 |
预防医学 | 2429篇 |
眼科学 | 1406篇 |
药学 | 5205篇 |
中国医学 | 696篇 |
肿瘤学 | 5055篇 |
出版年
2023年 | 410篇 |
2022年 | 1260篇 |
2021年 | 2006篇 |
2020年 | 1037篇 |
2019年 | 1520篇 |
2018年 | 1776篇 |
2017年 | 1340篇 |
2016年 | 1871篇 |
2015年 | 2523篇 |
2014年 | 2860篇 |
2013年 | 3323篇 |
2012年 | 4856篇 |
2011年 | 4761篇 |
2010年 | 2883篇 |
2009年 | 2367篇 |
2008年 | 3347篇 |
2007年 | 3062篇 |
2006年 | 2754篇 |
2005年 | 2635篇 |
2004年 | 2170篇 |
2003年 | 2027篇 |
2002年 | 1785篇 |
2001年 | 1189篇 |
2000年 | 1080篇 |
1999年 | 964篇 |
1998年 | 385篇 |
1997年 | 352篇 |
1996年 | 286篇 |
1995年 | 241篇 |
1994年 | 221篇 |
1993年 | 163篇 |
1992年 | 428篇 |
1991年 | 367篇 |
1990年 | 383篇 |
1989年 | 362篇 |
1988年 | 340篇 |
1987年 | 281篇 |
1986年 | 263篇 |
1985年 | 223篇 |
1984年 | 182篇 |
1983年 | 149篇 |
1982年 | 105篇 |
1981年 | 95篇 |
1980年 | 92篇 |
1979年 | 176篇 |
1978年 | 119篇 |
1977年 | 92篇 |
1975年 | 111篇 |
1972年 | 89篇 |
1971年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Clinical usefulness of intraductal ultrasonography for the management of acute biliary pancreatitis 下载免费PDF全文
13.
14.
Recent studies have reported an association between gastroesophageal reflux disease (GERD) and atrial fibrillation (AF). The objective of the present study was to evaluate whether AF is one of the risk factors for GERD occurrence.In this hospital-based, retrospective, case–control study, the patients were classified into 2 groups. The patients diagnosed with new AF were assigned to the AF group (n = 1612); those diagnosed without AF and GERD were assigned to the control group (n = 1612). The subjects in the control group were selected from outpatients of total healthcare center without a history of AF or GERD, and matched for age and gender. We evaluated the incidence of GERD and risk factors for GERD occurrence between the 2 groups.The number of patients experiencing occurrence of GERD during the follow-up period was significantly higher in the AF group than those in the control group, respectively (129 patients vs 98 subjects, P = 0.037). The incidence of GERD was significantly higher in the AF group than in the control group by Kaplan–Meier analysis with log-rank test (P = 0.008). The AF group''s adjusted hazard ratio of GERD occurrence against that of the control group was 1.37 (95% confidence interval [CI]: 1.16–1.57; P = 0.009) according to Cox''s proportional hazard model.The presence of AF appears to increase the incidence of GERD and may be considered a risk factor for the development of GERD. Further, large prospective and cohort studies will be required to better establish the correlation of GERD with AF. 相似文献
15.
The cingulum, connecting the orbitofrontal cortex to the medial temporal lobe, involves in diverse cognition functions including attention, memory, and motivation. To investigate the relationship between the cingulum injury and cognitive impairment in patients with chronic mild traumatic brain injury, we evaluated the integrity between the anterior cingulum and the basal forebrain using diffusion tensor tractography in 73 patients with chronic mild traumatic brain injury(39 males, 34 females, age 43.29 ± 11.42 years) and40 healthy controls(22 males, 18 females, age 40.11 ± 16.81 years). The patients were divided into three subgroups based on the integrity between the anterior cingulum and the basal forebrain on diffusion tensor tractography: subgroup A(n = 19 patients)-both sides of the anterior cingulum were intact; subgroup B(n= 36 patients)-either side of the anterior cingulum was intact; and subgroup C(18 patients)-both sides of the anterior cingulum were discontinued. There were significant differences in total Memory Assessment Scale score between subgroups A and B and between subgroups A and C. There were no significant differences in diffusion tensor tractography parameters(fractional anisotropy, apparent diffusion coefficient, and fiber volume) between patients and controls. These findings suggest that the integrity between the anterior cingulum and the basal forebrain, but not diffusion tensor tractography parameter, can be used to predict the cognitive function of patients with chronic mild traumatic brain injury. This study was approved by Yeungnam University Hospital Institutional Review Board(approval No. YUMC-2014-01-425-010) on August 16, 2017. 相似文献
16.
Hae June Lee Yeonghoon Son Minyoung Lee Changjong Moon Sung Ho Kim In Sik Shin Miyoung Yang Sangwoo Bae Joong Sun Kim 《中国神经再生研究》2019,(9)
Sodium butyrate is a histone deacetylase inhibitor that affects various types of brain damages. To investigate the effects of sodium butyrate on hippocampal dysfunction that occurs after whole-brain irradiation in animal models and the effect of sodium butyrate on radiation exposure-induced cognitive impairments,adult C57BL/6 mice were intraperitoneally treated with 0.6 g/kg sodium butyrate before exposure to 10 Gy cranial irradiation. Cognitive impairment in adult C57BL/6 mice was evaluated via an object recognition test 30 days after irradiation. We also detected the expression levels of neurogenic cell markers(doublecortin)and phosphorylated cAMP response element binding protein/brain-derived neurotrophic factor. Radiation-exposed mice had decreased cognitive function and hippocampal doublecortin and phosphorylated cAMP response element binding protein/brain-derived neurotrophic factor expression. Sodium butyrate pretreatment reversed these changes. These findings suggest that sodium butyrate can improve radiation-induced cognitive dysfunction through inhibiting the decrease in hippocampal phosphorylated cAMP response element binding protein/brain-derived neurotrophic factor expression. The study procedures were approved by the Institutional Animal Care and Use Committee of Korea Institute of Radiological Medical Sciences(approval No. KIRAMS16-0002) on December 30, 2016. 相似文献
17.
Lee Mi Jung Romero Sergio Velozo Craig A. Gruber-Baldini Ann L. Shulman Lisa M. 《Quality of life research》2019,28(6):1595-1603
Quality of Life Research - This study investigated the PROMIS Self-Efficacy Measure for Managing Chronic Conditions (PROMIS-SE) domain distributions and examined the factor structure of the... 相似文献
18.
19.
Three‐Dimensional Echocardiographic Evaluation of Mitral Apparatus during Preload Manipulation in Patients with Hypertrophic Cardiomyopathy 下载免费PDF全文
Hyemoon Chung M.D. Ji Hyun Yoon M.D. Young Won Yoon M.D. Ph.D. Ji Young Chung B.N. Jung‐Joon Cha M.D. Jong‐Youn Kim M.D. Ph.D. Pil‐Ki Min M.D. Ph.D. Byoung‐Kwon Lee M.D. Ph.D. Bum‐Kee Hong M.D. Ph.D. Se‐Joong Rim M.D. Ph.D. Hyuck Moon Kwon M.D. Eui‐Young Choi M.D. Ph.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(8):1261-1269
20.