全文获取类型
收费全文 | 4144篇 |
免费 | 275篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 138篇 |
妇产科学 | 58篇 |
基础医学 | 652篇 |
口腔科学 | 169篇 |
临床医学 | 399篇 |
内科学 | 808篇 |
皮肤病学 | 51篇 |
神经病学 | 471篇 |
特种医学 | 168篇 |
外科学 | 497篇 |
综合类 | 40篇 |
一般理论 | 4篇 |
预防医学 | 309篇 |
眼科学 | 125篇 |
药学 | 253篇 |
中国医学 | 2篇 |
肿瘤学 | 227篇 |
出版年
2023年 | 14篇 |
2022年 | 34篇 |
2021年 | 90篇 |
2020年 | 58篇 |
2019年 | 89篇 |
2018年 | 101篇 |
2017年 | 92篇 |
2016年 | 107篇 |
2015年 | 104篇 |
2014年 | 118篇 |
2013年 | 198篇 |
2012年 | 286篇 |
2011年 | 289篇 |
2010年 | 148篇 |
2009年 | 171篇 |
2008年 | 261篇 |
2007年 | 277篇 |
2006年 | 252篇 |
2005年 | 260篇 |
2004年 | 231篇 |
2003年 | 193篇 |
2002年 | 221篇 |
2001年 | 32篇 |
2000年 | 31篇 |
1999年 | 39篇 |
1998年 | 61篇 |
1997年 | 36篇 |
1996年 | 40篇 |
1995年 | 29篇 |
1994年 | 32篇 |
1993年 | 31篇 |
1992年 | 22篇 |
1991年 | 25篇 |
1990年 | 14篇 |
1989年 | 14篇 |
1988年 | 24篇 |
1986年 | 30篇 |
1985年 | 24篇 |
1984年 | 19篇 |
1983年 | 18篇 |
1982年 | 17篇 |
1981年 | 30篇 |
1980年 | 20篇 |
1979年 | 31篇 |
1978年 | 17篇 |
1977年 | 20篇 |
1976年 | 15篇 |
1973年 | 20篇 |
1972年 | 13篇 |
1967年 | 15篇 |
排序方式: 共有4443条查询结果,搜索用时 0 毫秒
101.
Tanja Stocks Moira A. Taylor Lars ?ngquist Ian A. MacDonald Peter Arner Claus Holst Jean-Michel Oppert J. Alfredo Martinez Stephan R?ssner Jan Polak Dominique Langin Wim H.M. Saris Arne Astrup Thorkild I.A. S?rensen 《Obesity facts》2013,6(3):217-227
ObjectiveTo investigate in a secondary analysis of a randomised trial the effects of a low-/high-fat diet and reported change from baseline in energy% from protein (prot%), in relation to changes in body size and metabolic factors.MethodsObese adults (n = 771) were randomised to a 600 kcal energy-deficient low-fat (20-25 fat%) or high-fat (40-45 fat%) diet over 10 weeks. Dietary intake data at baseline and during the intervention were available in 585 completers. We used linear regression to calculate the combined effects of randomised group and groups of prot% change (<−2 /−2 to 2/>2) on outcomes.ResultsThe low-fat group with >2 prot% increase lost 1.1 kg more weight (p = 0.03) and reduced cholesterol by 0.25 mmol/l more (p = 0.003) than the high-fat group with >2 prot% decrease. These differences were 2.5-fold and 1.8-fold greater than the differences between the low-fat and high-fat groups while not considering prot% change. The high-fat group reduced plasma triglycerides more than the low-fat group, but not compared to those in the low-fat group with >2 units prot% increase (p fat-protein interaction = 0.01).ConclusionsUnder energy restriction, participants on a low-fat diet who had increased the percentage energy intake from protein showed the greatest reduction in weight and cholesterol, and a triglyceride reduction equally large to that of participants on a high-fat diet.Key Words: Obesity, Dietary fats, Dietary proteins, Lipids, Blood glucose 相似文献
102.
Arne Halling Owe Löfman Ali-Reza Nosratabadi Christer Tagesson Britt Öster 《Acta odontologica Scandinavica》2013,71(6):356-360
Aluminum (Al) concentration was assessed in deciduous teeth in relation to sex, year of birth, tooth type, and the presence of caries and roots. Three hundred and twenty-three deciduous teeth from children born during the period 1952-93 in a county in southeast Sweden were sampled, and the Al content determined by graphite furnace atomic absorption spectrophotometry. The arithmetic mean of the Al concentration was 0.58 - 0.64 ppm dry weight (mean - standard deviation) and differed significantly between incisors (1.05 - 1.04 ppm) and canines (0.48 - 0.50 ppm) and between incisors and molars (0.53 - 0.55 ppm). A significant difference was found between teeth with and without caries. No significant differences were found between sexes. The Al concentration correlated significantly with tooth weight for incisors (r =-0.47)and canines (r =-0.45) but not for molars (r = 0.03). No significant change in Al concentration was found over time. Caries-free deciduous molars are suggested as the most useful teeth for biological monitoring of aluminum. 相似文献
103.
104.
105.
Kornet L van Hunnik A Michels K Verheule S Della Scala A West T Kessels R Cornelussen R 《Journal of interventional cardiac electrophysiology》2012,33(1):7-18
Background
Stimulation of the intra-cardiac vagal nerves innervating the AV-node (AVNS) is a promising approach to slow down ventricular rate (VR) during atrial fibrillation (AF). Our purpose was to demonstrate that effects on R-R-interval during stable AF can be maintained for several months once optimized and that AVNS affects specifically the nerves innervating the AV-node. 相似文献106.
107.
108.
Arne J. Venjakob Stephan Vogt Klaus Stöckl Thomas Tischer Philipp J. Jost Eckart Thein Andreas B. Imhoff Hermann Anetzberger 《Journal of orthopaedic research》2013,31(11):1820-1827
Local cooling is very common after bone and joint surgery. Therefore the knowledge of bone blood flow during local cooling is of substantial interest. Previous studies revealed that hypothermia leads to vasoconstriction followed by decreased blood flow levels. The aim of this study was to characterize if local cooling is capable of inducing reduced blood flow in bone tissue using a stepwise‐reduced temperature protocol in experimental rabbits. To examine bone blood flow we utilized the fluorescent microsphere (FM) method. In New Zealand white rabbits one randomly chosen hind limb was cooled stepwise from 32 to 2°C, whereas the contra lateral hind limb served as control. Injection of microspheres was performed after stabilization of bone and muscle temperature at each temperature level. Bones were removed, dissected and fluorescence intensity was determined to calculate blood flow values. We found that blood flow of all cooled regions decreased relative to the applied external temperature. At maximum cooling blood flow was almost completely disrupted, indicating local cooling as powerful regulatory mechanism for regional bone blood flow (RBBF). Postoperative cooling therefore may lead to strongly decreased bone blood flow values. As a result external cooling has capacity to both diminish bone healing and reduce bleeding complications. © 2013 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 31:1820–1827, 2013 相似文献
109.
Bjørg-Tilde S. Fevang Stein H. L. Lygre Glenn Bertelsen Arne Skredderstuen Leif I. Havelin Ove Furnes 《International orthopaedics》2013,37(1):59-66
Purpose
Functional results of reversed total prostheses (RTP) have—to a very limited degree—been compared with those of other shoulder prosthesis types. The aim of our study was to compare results of four different types of shoulder prostheses in terms of function, pain, and quality of life (QoL).Methods
Questionnaires were completed by 859 patients with shoulder prostheses registered in the Norwegian Arthroplasty Register. Patients with osteoarthritis (OA), rheumatoid arthritis (RA), or fracture sequela (FS) were included. Symptoms and function were assessed using the Oxford Shoulder Score (OSS, scale 0–48), and the EuroQoL-5D (EQ-5D) was used to assess QoL.Results
Best functional results were obtained using conventional total prostheses (TPs) and RTPs —mean OSS improvement 18 and 16 units, respectively, vs 11 with hemiprostheses (HPs). For patients with OA, TPs performed best; for those with RA and FS, RTPs performed best; and those with HPs had the worst results in all diagnostic groups. The greatest improvement in QoL was seen in patients with TPs and RTPs.Conclusions
Conventional TPs provide the best improvement in pain, function and QoL in OA patients; RTPs are superior in patients with RA and FS. 相似文献110.
Stephan Vogt Arne J. Venjakob Klaus Stöckl Thomas Tischer Philipp J. Jost Andreas B. Imhoff Eckart Thein Hermann Anetzberger 《Archives of orthopaedic and trauma surgery》2013,133(9):1233-1241