全文获取类型
收费全文 | 48220篇 |
免费 | 4487篇 |
国内免费 | 3659篇 |
专业分类
耳鼻咽喉 | 306篇 |
儿科学 | 435篇 |
妇产科学 | 482篇 |
基础医学 | 5696篇 |
口腔科学 | 746篇 |
临床医学 | 6974篇 |
内科学 | 7517篇 |
皮肤病学 | 588篇 |
神经病学 | 2616篇 |
特种医学 | 1940篇 |
外国民族医学 | 23篇 |
外科学 | 4419篇 |
综合类 | 7803篇 |
现状与发展 | 15篇 |
一般理论 | 7篇 |
预防医学 | 2956篇 |
眼科学 | 1471篇 |
药学 | 5093篇 |
84篇 | |
中国医学 | 2891篇 |
肿瘤学 | 4304篇 |
出版年
2024年 | 156篇 |
2023年 | 865篇 |
2022年 | 2074篇 |
2021年 | 2645篇 |
2020年 | 1987篇 |
2019年 | 1664篇 |
2018年 | 1769篇 |
2017年 | 1535篇 |
2016年 | 1464篇 |
2015年 | 2193篇 |
2014年 | 2662篇 |
2013年 | 2352篇 |
2012年 | 3482篇 |
2011年 | 3907篇 |
2010年 | 2385篇 |
2009年 | 1870篇 |
2008年 | 2502篇 |
2007年 | 2573篇 |
2006年 | 2500篇 |
2005年 | 2595篇 |
2004年 | 1499篇 |
2003年 | 1341篇 |
2002年 | 1118篇 |
2001年 | 1113篇 |
2000年 | 1163篇 |
1999年 | 1229篇 |
1998年 | 799篇 |
1997年 | 818篇 |
1996年 | 635篇 |
1995年 | 575篇 |
1994年 | 518篇 |
1993年 | 302篇 |
1992年 | 381篇 |
1991年 | 310篇 |
1990年 | 285篇 |
1989年 | 247篇 |
1988年 | 233篇 |
1987年 | 209篇 |
1986年 | 155篇 |
1985年 | 110篇 |
1984年 | 50篇 |
1983年 | 38篇 |
1982年 | 19篇 |
1981年 | 12篇 |
1980年 | 14篇 |
1979年 | 12篇 |
1966年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Background:Glucokinase activators are a novel family of glucose-lowering agents used for the treatment of type-2 diabetes mellitus (T2DM). Glucokinase activators blind to GK activate the enzyme allosterically. Treatment with different GKAs has been shown to reduce fasting and postprandial glucose in patients with type 2 diabetes. We compared the efficacy/safety of glucokinase activators in T2DM patients through a meta-analysis.Methods:We searched PubMed, Excerpt Medica Database, and Cochrane Central Register of Controlled Trials databases for articles published before December 30, 2020. Two independent reviewers extracted the information from article. The quality of articles were assessed by 2 independent reviewers using the 5 items of scale proposed by Jadad. We computed the weighted mean difference and 95% confidence interval (CI) for a change from baseline to the study endpoint for glucokinase activators vs placebo. Egger test and Begg test were used to assess the possible publication bias caused by the tendency of published studies to be positive.Results:The present meta-analysis will compare the efficacy and safety of glucokinase activators and placebo for the treatment of T2DM.Conclusions:This meta-analysis will provide advanced evidence on the efficacy and safety of glucokinase activators for the treatment of T2DM.Ethics and dissemination:Ethical approval and patient consent are not required because this study is a literature-based study. This systematic review and meta-analysis will be published in a peer-reviewed journalPROSPERO registration number:CRD42021220364. 相似文献
952.
Qing Zhang Jie Li Yan Zhang Jie Gao Peixue Wang Minghua Ai Wen Ding Xiaoping Tan 《Medicine》2021,100(19)
To evaluate the clinical characteristics and liver injury in coronavirus disease 2019 (COVID-19) patients, and analyze the differences between suspected and confirmed COVID-19 patients, this retrospective study was performed on 157 COVID-19 patients and 93 suspected patients who were ultimately excluded from COVID-19 (control patients). Differences in clinical characteristics and liver injury between suspected and confirmed COVID-19 patients were analyzed. Age, male sex, fever, chest tightness and dyspnea were related to the severity of COVID-19. C-reactive protein (CRP) and D-dimer may be predictors of the severity of COVID-19. Computed tomography (CT) played an important role in the screening of COVID-19 and the evaluation of disease severity. Multiple factors may cause liver injury in COVID-19 patients. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) may be more likely to cause liver injury than common respiratory infectious diseases. Age, temperature (T), white blood cell (WBC), lymphocytes (LY), hematocrit (HCT), CRP, and finger pulse oxygen saturation (SpO2) may correlate with liver function impairment and may predict the occurrence and severity of liver function impairment. Some therapeutic drugs (like glucocorticoid) may be involved in the liver function impairment of COVID-19 patients. Most liver function indices improved significantly after active treatment. Although COVID-19 and other common respiratory infectious diseases share some clinical characteristics, COVID-19 has its own characteristics. 相似文献
953.
Luhan Yang George Church Hong-Ye Zhao Lusheng Huang Yangbin Gao Hong-Jiang Wei Geoffrey Yang 《Proceedings of the National Academy of Sciences of the United States of America》2021,118(22)
Germline editing, the process by which the genome of an individual is edited in such a way that the change is heritable, has been applied to a wide variety of animals [D. A. Sorrell, A. F. Kolb, Biotechnol. Adv. 23, 431–469 (2005); D. Baltimore et al., Science 348, 36–38 (2015)]. Because of its relevancy in agricultural and biomedical research, the pig genome has been extensively modified using a multitude of technologies [K. Lee, K. Farrell, K. Uh, Reprod. Fertil. Dev. 32, 40–49 (2019); C. Proudfoot, S. Lillico, C. Tait-Burkard, Anim. Front. 9, 6–12 (2019)]. In this perspective, we will focus on using pigs as the model system to review the current methodologies, applications, and challenges of mammalian germline genome editing. We will also discuss the broad implications of animal germline editing and its clinical potential. 相似文献
954.
Wen Jing Chang Xiaocen Bai Bowen Gao Qian Zhao Yuyan 《Digestive diseases and sciences》2022,67(6):2173-2181
Digestive Diseases and Sciences - Colon cancer, ranked third in cancer related mortality, is the most common malignant cancer of digestive tract. Though immune checkpoint inhibitors show promising... 相似文献
955.
956.
Lunan Li Jiyong Jing Huiqin Gao Chenjing Zhang Haifang Lou Wensheng Pan 《Gastroenterologia y hepatologia》2021,44(4):286-292
Background and aimsThe regular arrangement of collecting venules (RAC) refers to the appearance of multiple regular tiny veins in the body of the stomach and is considered to be very effective for identifying gastric mucosa with non-Helicobacter pylori infection. This meta-analysis was conducted to systematically evaluate the value of the sign in predicting a Helicobacter pylori-negative stomach and the relevant factors that may affect the performance of this prediction.MethodsTwo biomedical databases (PubMed and EMBASE) were systematically searched through April 20, 2020. The pooled sensitivity, specificity, positive likelihood ratio (PLR), negative likelihood ratio (NLR), diagnostic odds ratio (DOR) and area under the SROC curve (AUC) were calculated.ResultsFourteen articles with 4070 patients were included. The pooled sensitivity, specificity, PLR, NLR, DOR and AUC for the RAC in predicting non-Hp infection were 0.80 (0.67–0.89), 0.97 (0.93–0.98), 24.8 (12.2–50.8), 0.21 (0.12–0.36), 120 (47–301) and 0.97 (0.19–1.00), respectively.ConclusionsThe RAC is a valuable endoscopic feature for the prediction of patients without Hp infection. 相似文献
957.
Gao Zhen-yu Su Lin-chong Wu Qing-chao Sheng Jiao-e Wang Yun-long Dai Yu-fang Chen An-ping He San-shan Huang Xia Yan Guo-qing 《Clinical rheumatology》2022,41(2):437-452
Clinical Rheumatology - Lupus erythematosus is an autoimmune disease that causes damage to multiple organs ranging from skin lesions to systemic manifestations. Cutaneous lupus erythematosus (CLE)... 相似文献
958.
Zhang Yan-fen Gao Shan-shan Li Jia-li Zuo Wen-si Qiu Yue-wen Xiao Yao-cheng 《Clinical rheumatology》2022,41(9):2677-2683
Clinical Rheumatology - Rheumatoid wrist arthritis is a chronic autoimmune disease, resulting in joint deformity and functional impairment. We aimed to compare the wrist synovial ultrasound indices... 相似文献
959.
Clinical Rheumatology - It has been known that aorta, subclavian, and extracranial arteries are commonly involved in Takayasu arteritis (TA). However, the involvement of intracranial artery in TA... 相似文献
960.
目的:观察APP/PS1双转基因小鼠海马内Aβ沉积的形态特征。方法:以10月龄雄性APP/PS1双转基因小鼠和C57BL/6小鼠为研究对象,采用Aβ免疫组化和透射电镜技术,观察海马部位Aβ的沉积情况及相关的病理特征。结果:在双转基因小鼠海马内存在致密性神经炎性斑块及营养障碍性突起,但脑微血管壁的Aβ沉积不甚明显;营养障碍性突起及神经细胞、微血管内皮细胞、周细胞内存在大量的自噬泡及次级溶酶体,提示该模型存在自噬溶酶体途径功能紊乱。结论:该鼠模拟了AD的老年斑及相关退行性变等病理改变,其中可能伴有细胞多种代谢的变化及血脑屏障功能的变化。从老年斑角度而言,该动物是成功的阿尔茨海默病动物模型,可用于AD的生化、病理研究及新治疗方法的探索。 相似文献