全文获取类型
收费全文 | 21760篇 |
免费 | 2123篇 |
国内免费 | 51篇 |
专业分类
耳鼻咽喉 | 171篇 |
儿科学 | 690篇 |
妇产科学 | 545篇 |
基础医学 | 2932篇 |
口腔科学 | 289篇 |
临床医学 | 2920篇 |
内科学 | 4300篇 |
皮肤病学 | 250篇 |
神经病学 | 2375篇 |
特种医学 | 547篇 |
外国民族医学 | 1篇 |
外科学 | 2309篇 |
综合类 | 407篇 |
一般理论 | 24篇 |
预防医学 | 2938篇 |
眼科学 | 304篇 |
药学 | 1706篇 |
中国医学 | 13篇 |
肿瘤学 | 1213篇 |
出版年
2023年 | 188篇 |
2022年 | 229篇 |
2021年 | 503篇 |
2020年 | 359篇 |
2019年 | 564篇 |
2018年 | 558篇 |
2017年 | 476篇 |
2016年 | 511篇 |
2015年 | 509篇 |
2014年 | 674篇 |
2013年 | 987篇 |
2012年 | 1324篇 |
2011年 | 1355篇 |
2010年 | 728篇 |
2009年 | 623篇 |
2008年 | 1036篇 |
2007年 | 1162篇 |
2006年 | 1057篇 |
2005年 | 982篇 |
2004年 | 899篇 |
2003年 | 860篇 |
2002年 | 818篇 |
2001年 | 509篇 |
2000年 | 508篇 |
1999年 | 476篇 |
1998年 | 214篇 |
1997年 | 179篇 |
1996年 | 187篇 |
1995年 | 167篇 |
1994年 | 180篇 |
1993年 | 167篇 |
1992年 | 363篇 |
1991年 | 356篇 |
1990年 | 291篇 |
1989年 | 283篇 |
1988年 | 282篇 |
1987年 | 273篇 |
1986年 | 256篇 |
1985年 | 231篇 |
1984年 | 210篇 |
1983年 | 184篇 |
1982年 | 134篇 |
1981年 | 114篇 |
1979年 | 167篇 |
1978年 | 156篇 |
1977年 | 109篇 |
1976年 | 131篇 |
1974年 | 135篇 |
1973年 | 170篇 |
1972年 | 122篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Karis Bennett Tanner Vincent Sumathilatha Sakthi-Velavan 《Clinical anatomy (New York, N.Y.)》2022,35(1):52-64
The patellar ligament (PL) is an epiphyseal ligament and is part of the extensor complex of the knee. The ligament has gained attention due to its clinical relevance to autograft and tendinopathy. A variety of anatomical variations of the PL such as aplasia, numerical variations, and vascularity are being reported recently by clinicians and anatomists. The aim of this literature was to review the available literature to provide a consensus regarding anatomic variations of the PL, neurovasculature surrounding the PL, histology of the PL, and various aspects of PL measurements with relevance to the surgical considerations and sex and age-related differences. A narrative review of the patellar ligament was performed by conducting a detailed literature search and review of relevant articles. A total of 90 articles on the patellar ligament were included and were categorized into studies based on anatomical variations, neurovasculature, morphometrics, microanatomy, sex and age-related difference, and ACL reconstruction. The anatomical variations and morphometrics of the PL were found to correlate with the frequency of strain injuries, tendinopathy, and efficacy of the PL autograft in anterior cruciate ligament reconstruction. The sex differences in PL measurements and the effect of estrogen on collagen synthesis explained a higher incidence of patellar tendinopathy in women. An awareness of its variations enables careful selection of surgical incisions, thereby avoiding complications related to nerve injury. Accurate knowledge of the PL microanatomy assists in understanding the mechanism of ligament degeneration, rupture, autograft harvesting, and ligamentization results. 相似文献
4.
Joseph M. Northey Kate L. Pumpa Clare Quinlan Ashley Ikin Kellie Toohey Disa J. Smee Ben Rattray 《Journal of Science and Medicine in Sport》2019,22(5):580-585
Objectives
The current study investigated the effects of two exercise interventions on cognitive function amongst breast cancer survivors.Design
Pilot randomised-controlled trial.Methods
Seventeen female cancer survivors (mean: 62.9 ± 7.8 years) were randomised into three groups: high-intensity interval training (HIIT, n = 6); moderate-intensity continuous training (MOD, n = 5); or wait-list control (CON, n = 6). The HIIT and MOD groups exercised on a cycle ergometer 3 days/week for 12-weeks. Primary outcomes were cognitive function assessments utilising CogState. Secondary outcomes were resting middle cerebral artery blood flow velocity, cerebrovascular reactivity and aerobic fitness (VO2peak). Data were analysed with General Linear Mixed Models and Cohen’s d effect sizes were calculated.Results
All 17 participants who were randomised were available for follow-up analysis and adherence was similar for HIIT and MOD (78.7 ± 13.2% vs 79.4 ± 12.0%; p = 0.93). Although there were no significant differences in the cognitive and cerebrovascular outcomes, HIIT produced moderate to large positive effects in comparison to MOD and CON for outcomes including episodic memory, working memory, executive function, cerebral blood flow and cerebrovascular reactivity. HIIT significantly increased VO2peak by 19.3% (d = 1.28) and MOD had a non-significant 5.6% (d = 0.72) increase, compared to CON which had a 2.6% decrease.Conclusions
This study provides preliminary evidence that HIIT may be an effective exercise intervention to improve cognitive performance, cerebrovascular function and aerobic fitness in breast cancer survivors. Considering the sample size is small, these results should be confirmed through larger clinical trials. 相似文献5.
Background: It is widely known that a proportion of university students use drugs. However, much less is known about how they source and supply their drugs. Objectives: In this article, we investigate student drug trading activity, including how they obtained their drugs, whether they sold drugs, and the extent to which their drug trading might be described as a form of “social supply”. Methods: A survey was conducted of all students across seven of the nine universities of Wales. In total, 7855 students submitted a questionnaire and 1877 of these reported drug use in the current academic year. All students who reported using one or more illegal drugs in the current academic year were asked how they obtained their drugs, how they funded their drug use, whether they had sold, traded or given away illegal drugs, along with their motives for drug trading. Results: The results showed that about half of users obtained drugs solely from friends and associates and one-fifth obtained them solely from external dealers. One-quarter used friends and associates as well as external markets. In many cases, supplying drugs amounted to sharing them or giving them away. However, over one-third of students said that they had sold drugs. Conclusions: Overall, the methods of sourcing and supplying drug among university students shares features of both “social supply” and “traditional” drug markets. We conclude that the student drug market investigated is best described as a “hybrid” combination of both. 相似文献
6.
Interaction effects between the 5‐hydroxy tryptamine transporter‐linked polymorphic region (5‐HTTLPR) genotype and family conflict on adolescent alcohol use and misuse
下载免费PDF全文
![点击此处可从《Addiction (Abingdon, England)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
7.
8.
9.
Kate Ridley Tim S Olds Alison Hill 《The international journal of behavioral nutrition and physical activity》2006,3(1):10-11
Background
Self-report recall questionnaires are commonly used to measure physical activity, energy expenditure and time use in children and adolescents. However, self-report questionnaires show low to moderate validity, mainly due to inaccuracies in recalling activity in terms of duration and intensity. Aside from recall errors, inaccuracies in estimating energy expenditure from self-report questionnaires are compounded by a lack of data on the energy cost of everyday activities in children and adolescents. This article describes the development of the Multimedia Activity Recall for Children and Adolescents (MARCA), a computer-delivered use-of-time instrument designed to address both the limitations of self-report recall questionnaires in children, and the lack of energy cost data in children. 相似文献10.
Mary C. Gawlicki MBA Margaret C. Reilly MPH Ana Popielnicki BA Kate Reilly MA 《Value in health》2006,9(3):199-204
INTRODUCTION: There are no measures of health-related absenteeism and presenteeism validated for use in the large and increasing US Spanish-speaking population. Before using a Spanish translation of an available English-language questionnaire, the linguistic validity of the Spanish version must be established to ensure its conceptual equivalence to the original and its cultural appropriateness. OBJECTIVE: The objective of this study was to evaluate the linguistic validity of the US Spanish version of the Work Productivity and Activity Impairment questionnaire, General Health Version (WPAI:GH). METHODS: A US Spanish translation of the US English WPAI:GH was created through a reiterative process of creating harmonized forward and back translations by independent translators. Spanish-speaking and English-speaking subjects residing in the US self-administered the WPAI:GH in their primary language and were subsequently debriefed by a bilingual (Spanish-English) interviewer. RESULTS: US Spanish subjects (N = 31) and English subjects (N = 35), stratified equally by educational level, with and without a high school degree participated in the study. The WPAI-GH item comprehension rate was 98.6% for Spanish and 99.6% for English. Response revision rates during debriefing were 1.6% for Spanish and 0.5% for English. Responses to hypothetical scenarios indicated that both language versions adequately differentiate sick time taken for health and non-health reasons and between absenteeism and presenteeism. CONCLUSION: Linguistic validity of the US Spanish translation of the WPAI:GH was established among a diverse US Spanish-speaking population, including those with minimal education. 相似文献