全文获取类型
收费全文 | 4797篇 |
免费 | 375篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 48篇 |
儿科学 | 153篇 |
妇产科学 | 104篇 |
基础医学 | 669篇 |
口腔科学 | 85篇 |
临床医学 | 423篇 |
内科学 | 1099篇 |
皮肤病学 | 111篇 |
神经病学 | 498篇 |
特种医学 | 85篇 |
外科学 | 650篇 |
综合类 | 28篇 |
预防医学 | 558篇 |
眼科学 | 74篇 |
药学 | 279篇 |
中国医学 | 22篇 |
肿瘤学 | 301篇 |
出版年
2024年 | 12篇 |
2023年 | 82篇 |
2022年 | 142篇 |
2021年 | 274篇 |
2020年 | 179篇 |
2019年 | 196篇 |
2018年 | 227篇 |
2017年 | 156篇 |
2016年 | 141篇 |
2015年 | 140篇 |
2014年 | 185篇 |
2013年 | 232篇 |
2012年 | 332篇 |
2011年 | 354篇 |
2010年 | 198篇 |
2009年 | 159篇 |
2008年 | 246篇 |
2007年 | 246篇 |
2006年 | 259篇 |
2005年 | 230篇 |
2004年 | 213篇 |
2003年 | 176篇 |
2002年 | 156篇 |
2001年 | 97篇 |
2000年 | 94篇 |
1999年 | 76篇 |
1998年 | 23篇 |
1997年 | 26篇 |
1996年 | 24篇 |
1995年 | 19篇 |
1994年 | 7篇 |
1993年 | 20篇 |
1992年 | 40篇 |
1991年 | 39篇 |
1990年 | 21篇 |
1989年 | 26篇 |
1988年 | 11篇 |
1987年 | 19篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1982年 | 10篇 |
1981年 | 12篇 |
1980年 | 5篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 8篇 |
1974年 | 6篇 |
1967年 | 4篇 |
1966年 | 4篇 |
排序方式: 共有5187条查询结果,搜索用时 31 毫秒
11.
12.
The issue of the preparation of effective teachers becomes more critical for teachers of early childhood programs. It has been hypothesized that better program quality depends on better-educated teachers. The purpose of this investigation was to explore the importance of a high level of education for all early childhood education teachers. This issue has intrigued early childhood researchers and has prompted a large amount of research studies over the past decades. In order to assess the status of this line of inquiry and to provide guidance for future research, a critical analysis of 40 studies on the preparation of early childhood education teachers and the quality of their educational programs that were published within a 15-year (1989-2004) period is presented here. The analysis consisted of literal and allegorical critical analysis and interpretative critical analyses, which generated results in three main areas that focused on the professional development of the teachers, including teachers' professional development, the importance of a Bachelor's Degree and educational standards for early childhood education teachers. 相似文献
13.
Olivia Okereke Jae H Kang J Michael Gaziano Jing Ma Meir J Stampfer Francine Grodstein 《The American journal of geriatric psychiatry》2006,14(12):1041-1050
BACKGROUND: Emerging evidence suggests that type 2 diabetes may be related to diminished cognition, but little data are available directly regarding the role of insulin levels. OBJECTIVE: The objective of this prospective cohort study was to examine the relation of insulin secretion to cognitive function among men without diabetes. SETTING: The study setting was the Physicians' Health Study-U.S. male physicians. PARTICIPANTS: Three hundred sixty-seven men who provided blood samples in 1982, when they had no lifetime history of diabetes and ranged in age from 47-65 years (mean age: 57 years). MEASUREMENTS: The authors assayed plasma C-peptide, reflecting insulin secretion, in the stored blood samples. Beginning in 2001, an average 18 years after blood collection, the authors administered telephone interviews, including tests of general cognition (Telephone Interview of Cognitive Status [TICS]), verbal memory, and category fluency. The authors used regression models to estimate mean differences in cognitive performance across levels of C-peptide controlling for a wide variety of potential confounding factors. RESULTS: On the TICS, men in the top tertile of C-peptide performed significantly worse than those in the bottom (multivariable-adjusted mean difference: -1.01 points, 95% confidence interval: -1.78 to -0.24); this apparent impact of C-peptide on cognition was equivalent to the cognitive differences the authors observed between men 6 years apart in age. Performance on the global score (combining results from all the individual tests) and verbal memory score (combining results from four tests of verbal memory) appeared lower among men in the highest C-peptide tertile, but results were not statistically significant. CONCLUSION: Higher midlife insulin secretion may be related to decreased later-life cognitive function, even among men without diabetes. 相似文献
14.
Olivia N. Saracho 《Early child development and care》1992,78(1):225-229
Critical issues in the field of teacher education are identified and related to concerns for the preparation of early childhood teachers and the search for professionalism. A concern for quantity and standards and the clarification of professional knowledge are identified as issues of international significance. 相似文献
15.
16.
17.
Summary Throughout history, different etiologies have been suggested for torus palatinus. In more recent years, however, torus palatinus has been attributed to heredity; a case which confirms this is presented. The relevant literature is reviewed. 相似文献
18.
19.
Non-Type b Haemophilus influenzae Infections in Adults with Reference to Biotype 总被引:2,自引:4,他引:2
下载免费PDF全文
![点击此处可从《Journal of clinical microbiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Robert H. K. Eng Michael L. Corrado Dennis Cleri Marcelino F. Sierra 《Journal of clinical microbiology》1980,11(6):669-671
We report three cases of serious non-group b Haemophilus influenzae infections. The significance of these isolates with respect to both biotypes and serotypes is discussed. 相似文献
20.
Human immunodeficiency virus is undoubtedly the causative agent of AIDS. The understanding of HIV-1 pathogenesis is essential to develop and maintain antiretroviral treatment and vaccination. Since the first isolation of HIV-1 in cell culture, thousands of publications dealing with HIV and/or AIDS per year were released. In this review we give a basic overview of the virology of HIV-1 including the functions of the different HIV-1 proteins required for effective viral replication. Moreover, we summarize the interactive processes between HIV-1 and its target cells. Finally, the HIV-1 specific immune response and the current status of antiretroviral therapy are briefly described in this review. 相似文献