全文获取类型
收费全文 | 5495篇 |
免费 | 414篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 91篇 |
妇产科学 | 137篇 |
基础医学 | 1074篇 |
口腔科学 | 56篇 |
临床医学 | 457篇 |
内科学 | 1269篇 |
皮肤病学 | 61篇 |
神经病学 | 621篇 |
特种医学 | 119篇 |
外科学 | 759篇 |
综合类 | 17篇 |
一般理论 | 2篇 |
预防医学 | 308篇 |
眼科学 | 102篇 |
药学 | 426篇 |
中国医学 | 9篇 |
肿瘤学 | 410篇 |
出版年
2023年 | 63篇 |
2022年 | 173篇 |
2021年 | 229篇 |
2020年 | 107篇 |
2019年 | 159篇 |
2018年 | 172篇 |
2017年 | 99篇 |
2016年 | 134篇 |
2015年 | 169篇 |
2014年 | 199篇 |
2013年 | 254篇 |
2012年 | 394篇 |
2011年 | 459篇 |
2010年 | 256篇 |
2009年 | 230篇 |
2008年 | 392篇 |
2007年 | 394篇 |
2006年 | 366篇 |
2005年 | 329篇 |
2004年 | 294篇 |
2003年 | 283篇 |
2002年 | 224篇 |
2001年 | 57篇 |
2000年 | 34篇 |
1999年 | 41篇 |
1998年 | 44篇 |
1997年 | 36篇 |
1996年 | 25篇 |
1995年 | 21篇 |
1993年 | 13篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 8篇 |
1984年 | 11篇 |
1983年 | 11篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1976年 | 8篇 |
1975年 | 14篇 |
1974年 | 19篇 |
1973年 | 22篇 |
1972年 | 20篇 |
1970年 | 7篇 |
1969年 | 11篇 |
1968年 | 9篇 |
1967年 | 9篇 |
排序方式: 共有5945条查询结果,搜索用时 15 毫秒
81.
82.
83.
Denis A. Mogilenko Oleg Shpynov Prabhakar Sairam Andhey Laura Arthur Amanda Swain Ekaterina Esaulova Simone Brioschi Irina Shchukina Martina Kerndl Monika Bambouskova Zhangting Yao Anwesha Laha Konstantin Zaitsev Samantha Burdess Susan Gillfilan Sheila A. Stewart Marco Colonna Maxim N. Artyomov 《Immunity》2021,54(1):99-115.e12
84.
85.
Aleksei Viktorovich Novik Svetlana Anatolievna Protsenko Irina Alexandrovna Baldueva Lev Michailovich Berstein Vladimir Nikolaevich Anisimov Irina Nikolaevna Zhuk Anna Igorevna Semenova Dilorom Khamidovna Latipova Elena Viktorovna Tkachenko Tatiana Yurievna Semiglazova 《The oncologist》2021,26(5):364-e734
Lessons Learned
- Melatonin did not increase the efficacy of systemic chemotherapy in melanoma.
- Metformin did not increase the efficacy of systemic chemotherapy in melanoma.
86.
87.
88.
Andrei Ionescu Elisabeth Wutscher Eugenio Brambilla Sibylle Schneider‐Feyrer Franz J. Giessibl Sebastian Hahnel 《European journal of oral sciences》2012,120(5):458-465
The aim of this in vitro study was to evaluate the influence of physicochemical surface properties of resin‐based composites on Streptococcus mutans biofilm formation. Specimens were prepared from each of four resin‐based composites by polymerization against Mylar strips. Half of the number of specimens received no further surface treatment, whereas the other half were subjected to a polishing treatment. Surface roughness (SR) and topography were assessed using profilometry and atomic force microscopy. Surface free‐energy (SFE) was determined, and the chemical surface composition was analysed by X‐ray photoelectron spectroscopy (XPS). S. mutans biofilms were formed on the surface of the resin‐based composite specimens for either 48 or 96 h using an artificial mouth system (AMS). Polishing caused a significant decrease in SFE, and XPS analysis indicated an increase of surface silicon and a decrease of surface carbon. Only for Grandio was a significant increase in SR identified after polishing, which was probably related to the higher concentration of filler particles on its surface. Significantly less S. mutans biofilm formation was observed on polished resin‐based composites than on unpolished resin‐based composites. These results indicate that the proportions of resin matrix and filler particles on the surface of resin‐based composites strongly influence S. mutans biofilm formation in vitro, suggesting that minimization of resin matrix exposure might be useful to reduce biofilm formation on the surface of resin‐based composites. 相似文献
89.
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Aufgabe des Immunsystems ist es, den Körper gegen eindringende Krankheitserreger zu schützen. Voraussetzung dafür... 相似文献
90.
Aim: This paper explored the relationship between maternal controlling feeding behaviours and child eating and weight in preschool‐aged children. Methods: Ninety mothers of 2‐ to 5‐year‐old children (M = 3.48, SD = 0.84, 54.4% males) completed self‐report measures assessing maternal controlling feeding behaviours, child eating patterns and weight. Results: Univariate analyses indicated that child food neophobia was associated with authoritarian feeding (r= 0.29), pressure to eat (r= 0.28) and restriction (r= 0.34). Child food pickiness was associated with authoritarian feeding (r= 0.35). No association was found between maternal feeding strategies and child weight. Multivariate regression analyses indicated that authoritarian feeding, restriction and pressure to eat were significantly associated with the variance in child food neophobia (adjusted R2= 12.6%) and pickiness (adjusted R2= 12.0%). Conclusions: The findings suggest that maternal control in feeding is associated with undesirable eating patterns in preschool‐aged children. Interventions targeting reduction in maternal controlling feeding may promote desirable eating patterns in preschool‐aged children. 相似文献