全文获取类型
收费全文 | 2430663篇 |
免费 | 199734篇 |
国内免费 | 7549篇 |
专业分类
耳鼻咽喉 | 34729篇 |
儿科学 | 73519篇 |
妇产科学 | 63824篇 |
基础医学 | 341068篇 |
口腔科学 | 68498篇 |
临床医学 | 222108篇 |
内科学 | 477314篇 |
皮肤病学 | 48580篇 |
神经病学 | 203420篇 |
特种医学 | 98280篇 |
外国民族医学 | 920篇 |
外科学 | 366878篇 |
综合类 | 65080篇 |
现状与发展 | 16篇 |
一般理论 | 992篇 |
预防医学 | 194281篇 |
眼科学 | 56796篇 |
药学 | 183507篇 |
56篇 | |
中国医学 | 7400篇 |
肿瘤学 | 130680篇 |
出版年
2018年 | 26121篇 |
2017年 | 20497篇 |
2016年 | 22247篇 |
2015年 | 25616篇 |
2014年 | 36514篇 |
2013年 | 53775篇 |
2012年 | 72869篇 |
2011年 | 76659篇 |
2010年 | 45376篇 |
2009年 | 43221篇 |
2008年 | 71853篇 |
2007年 | 76250篇 |
2006年 | 76923篇 |
2005年 | 74775篇 |
2004年 | 71509篇 |
2003年 | 69050篇 |
2002年 | 68091篇 |
2001年 | 113735篇 |
2000年 | 117779篇 |
1999年 | 99473篇 |
1998年 | 28551篇 |
1997年 | 26238篇 |
1996年 | 26023篇 |
1995年 | 25102篇 |
1994年 | 23598篇 |
1993年 | 21833篇 |
1992年 | 79753篇 |
1991年 | 76680篇 |
1990年 | 73854篇 |
1989年 | 71091篇 |
1988年 | 66041篇 |
1987年 | 64983篇 |
1986年 | 61467篇 |
1985年 | 58500篇 |
1984年 | 44295篇 |
1983年 | 37720篇 |
1982年 | 22919篇 |
1981年 | 20383篇 |
1979年 | 41346篇 |
1978年 | 29011篇 |
1977年 | 24364篇 |
1976年 | 22850篇 |
1975年 | 23984篇 |
1974年 | 29664篇 |
1973年 | 28064篇 |
1972年 | 26258篇 |
1971年 | 24178篇 |
1970年 | 22771篇 |
1969年 | 21099篇 |
1968年 | 19147篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
Bielik Peter Bonczek Ondřej Krejčí Přemysl Zeman Tomáš Izakovičová-Hollá Lydie Šoukalová Jana Vaněk Jiří Vojtěšek Bořivoj Lochman Jan Balcar Vladimir J. Šerý Omar 《Clinical oral investigations》2022,26(12):7045-7055
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of... 相似文献
122.
123.
124.
125.
126.
O. Morris M. Fairclough J. Grigg C. Prenant A. McMahon 《Journal of labelled compounds & radiopharmaceuticals》2019,62(1):4-23
Affinity peptide and protein‐ (APP) based radiotracers are an increasingly popular class of radiotracer in positron emission tomography (PET), which was once dominated by the use of small molecule radiotracers. Radiolabelled monoclonal antibodies (mAbs) are important examples of APPs, yet a preference for smaller APPs, which exhibit fast pharmacokinetics and permit rapid PET aided diagnosis, has become apparent. 18F exhibits favourable physical characteristics for APP radiolabelling and has been described as an ideal PET radionuclide. Notwithstanding, 18F radiolabelling of APP is challenging, and this is echoed in the literature where a number of diverse approaches have been adopted. This review seeks to assess and compare the approaches taken to 18F APP radiolabelling with the intention of highlighting trends within this expanding field. Generic themes have emerged in the literature, namely the use of mild radiolabelling conditions, a preference of site‐specific methodologies with an impetus for short, automated procedures which produce high‐yielding [18F]APPs. 相似文献
127.
128.
129.
B. Siska I. Machac P. Dolecek J. Martiska 《Pharmaceutical development and technology》2019,24(1):80-88
Rheological behaviour of pharmaceutical semisolid preparations significantly affects manufacturing process, administration, stability, homogeneity of incorporated drug, accuracy of dosing, adhesion in the place of application, drug release, and resulting therapeutic effect of the product. We performed test of consistency by penetrometry, rotational, oscillation and creep tests, and squeeze and tack tests of model samples to introduce methods suitable for characterization and comparison of semisolids in practice. Penetrometry is a simple method allowing sorting the semisolids to low and high stress-resistant materials but deficient for rheological characterization of semisolids. Value of yield stress, generally considered to be appropriate feature of semisolids, is significantly influenced by the method of testing and the way of evaluation. The hysteresis loops of model semisolids revealed incomplete thixotropy, therefore, three-step thixotropy test was employed. Semisolids showed nonlinear response in the creep phase of tests and partial recovery of structure by storing energy in the recovery phase. Squeeze and tack tests seem to be convenient ways for comparison of semisolids. Our study can contribute to a better understanding of different flow behaviour of semisolids given by different physicochemical properties of excipients and can bring useful approaches to evaluation and comparison of semisolids in practice. 相似文献
130.