全文获取类型
收费全文 | 41618篇 |
免费 | 2520篇 |
国内免费 | 128篇 |
专业分类
耳鼻咽喉 | 602篇 |
儿科学 | 986篇 |
妇产科学 | 942篇 |
基础医学 | 5932篇 |
口腔科学 | 3179篇 |
临床医学 | 2854篇 |
内科学 | 8761篇 |
皮肤病学 | 911篇 |
神经病学 | 3684篇 |
特种医学 | 924篇 |
外国民族医学 | 1篇 |
外科学 | 4652篇 |
综合类 | 169篇 |
一般理论 | 15篇 |
预防医学 | 4128篇 |
眼科学 | 814篇 |
药学 | 3507篇 |
中国医学 | 318篇 |
肿瘤学 | 1887篇 |
出版年
2023年 | 325篇 |
2022年 | 694篇 |
2021年 | 1316篇 |
2020年 | 812篇 |
2019年 | 1135篇 |
2018年 | 1618篇 |
2017年 | 1119篇 |
2016年 | 1169篇 |
2015年 | 1243篇 |
2014年 | 1577篇 |
2013年 | 2205篇 |
2012年 | 3361篇 |
2011年 | 3663篇 |
2010年 | 1839篇 |
2009年 | 1385篇 |
2008年 | 2729篇 |
2007年 | 2628篇 |
2006年 | 2348篇 |
2005年 | 2149篇 |
2004年 | 2032篇 |
2003年 | 1735篇 |
2002年 | 1398篇 |
2001年 | 719篇 |
2000年 | 735篇 |
1999年 | 560篇 |
1998年 | 230篇 |
1997年 | 167篇 |
1996年 | 150篇 |
1995年 | 130篇 |
1994年 | 119篇 |
1993年 | 105篇 |
1992年 | 262篇 |
1991年 | 238篇 |
1990年 | 222篇 |
1989年 | 185篇 |
1988年 | 180篇 |
1987年 | 131篇 |
1986年 | 154篇 |
1985年 | 160篇 |
1984年 | 114篇 |
1983年 | 81篇 |
1982年 | 76篇 |
1981年 | 72篇 |
1980年 | 69篇 |
1979年 | 104篇 |
1978年 | 68篇 |
1977年 | 67篇 |
1975年 | 64篇 |
1974年 | 65篇 |
1973年 | 61篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献42.
43.
Milena Soares Santos Guilherme de Sousa Ribeiro Tainara Queiroz Oliveira Renan Cardoso Nery Santos Edilane Gouveia Kátia Salgado Daniele Takahashi Cleuber Fontes Leila Carvalho Campos Mitermayer Galvão Reis Albert Icksang Ko Joice Neves Reis 《International journal of infectious diseases》2009,13(4):456-461
44.
45.
46.
The performance of a tooth replacement by using a dental implant relies on the mechanical and biological capability of the anatomical substitute to restore lost physiological functions. The design of an implant device able to properly replace the physiological tooth requires the study of the load transfer mechanism at the implant-bone interface and the understanding of the relevance of the periodontal ligament (PDL) in this mechanism. The PDL is a connective soft tissue that provides the fixation of the tooth in its bone-socket and the attenuation of occlusal loads. It also provides the ground cells that are involved in the remodelling process, induced by a change in the stress-strain pattern of the alveolar bone and also in the cementum of the tooth root. The purpose of this study was to determine the PDL effects on the dynamic load transfer mechanism, from the tooth to the alveolar bone, evaluating the equivalent dynamic stiffness of the ligament structure. A porcine fresh mandible with a tooth was used within the study, applying an experimental procedure to identify the dynamic transmissibility of the entire system. The transmissibility function provided information about the stiffness and damping of the PDL, information that can assist the design of an improved dental implant system. 相似文献
47.
Lázaro Alessandro S Nunes Paulo Guimar?es Gandra Armindo Antonio Alves Lauro T Kubota Denise Vaz de Macedo 《Clinical journal of sport medicine》2006,16(5):418-421
OBJECTIVE: The authors tested the effect of blood sampling (skin versus venous puncture) on some biochemical and hematological blood parameters in athletes to answer whether skin puncture could be used as a substitute for venous puncture. DESIGN: Comparative study of 2 methods of blood samples collection. SETTING: The blood was collected in the same athletes at 3 different moments of the preparatory training phase. PARTICIPANTS: Fourteen male indoor soccer players (22 +/- 1 years old) and 7 female handball players (18 +/- 1 years old) participated. MAIN OUTCOME MEASUREMENT: Blood was collected in heparin and K3EDTA by Vacutainer BD or Microvette Sarstedt system for biochemical and hematological analyses, respectively. RESULTS: There were no significant statistical differences between the 2 methods for the values of creatine kinase, urea, creatinine, lymphocytes, and platelets. The other hematological analyzes and uric acid exhibited significant higher values in skin blood, although they were all within the normal expected range. A high degree of correlation was observed between the 2 techniques for all parameters. CONCLUSIONS: Skin puncture is a reliable, easy, accurate, and less invasive sampling method for assessing hematological and some biochemical parameters in athletes, respecting that blood samples should always be obtained from the same site, especially in follow-up studies. 相似文献
48.
Francisco Sampaio Pedro Mateus Nuno Bettencourt Carla Costa Dias Luís Ad?o Lino Santos Madalena Teixeira Lino Sim?es Vasco Gama 《Revista portuguesa de cardiologia》2006,25(3):321-327
INTRODUCTION: Ischemic heart disease is a major cause of heart failure in western societies. However, the factors that may influence left ventricular function (LVF) recovery after an acute coronary syndrome (ACS) are still unclear. OBJECTIVE: To identify variables that may influence LVF evolution one year after ACS. METHODS: 104 patients hospitalized with ACS between 7/1/2001 and 12/31/2002 and with systolic dysfunction--defined as an echocardiographic ejection fraction (EF) < or = 45%--were randomly allocated to a planned coronary follow-up program (FUP) or a general cardiology clinic (GC); patients from both groups were also randomly referred to a structured cardiac rehabilitation program (CRP). EF was re-assessed at one year. We compared differences between patients who recovered left ventricular function (EF > 45%; group 1) and those who did not (group 2). RESULTS: One year after discharge, 44.2% of the patients had recovered function. There were no significant differences between the groups in gender (77.7 vs. 76.5% male), age (56 vs. 59 years), hypertension, diabetes, dyslipidemia, smoking habits or family history. A previous history of cardiovascular events was more frequent in group 2 (11.1% vs. 35.3%, p = 0.03). Cardiac catheterization was performed before discharge in 88.8% and 88.2% in groups 1 and 2 respectively (p = NS); no differences were found in coronary anatomy between the two groups. Angioplasty was performed in 54.2% in group 1 and 50% in group 2 (p = NS). There were no differences in the use of angiotensin-converting enzyme inhibitors (83.3% vs. 87.5%), beta-blockers (87.5% vs. 87.5%), nitrates (37.5% vs. 33.3%), aspirin (95.8% vs. 95.8%), statins (79.1% vs. 75%) or diuretics (20.8% vs. 45.8%). There was no significant difference in LVF recovery between patients randomized to FUP or GC (38.5% vs. 54.5%). 87.5% of patients who completed the CRP had normal EF at one year compared to 32.7% of patients not referred to the program (p = 0.009). Although EF improved in both groups, this improvement was greater in patients who completed a CRP (EF 8% vs. 5%, p = 0.003). CONCLUSION: A previous cardiovascular event and completion of a CRP were the only variables that influenced LVF recovery. Thus, enrollment in a CRP, in addition to standard therapy, could be an important therapeutic measure in patients with systolic dysfunction after ACS; our data suggest that these programs should be more widely used. 相似文献
49.
50.