全文获取类型
收费全文 | 23984篇 |
免费 | 1926篇 |
国内免费 | 99篇 |
专业分类
耳鼻咽喉 | 230篇 |
儿科学 | 691篇 |
妇产科学 | 484篇 |
基础医学 | 3509篇 |
口腔科学 | 605篇 |
临床医学 | 2195篇 |
内科学 | 4968篇 |
皮肤病学 | 569篇 |
神经病学 | 2513篇 |
特种医学 | 785篇 |
外科学 | 1932篇 |
综合类 | 125篇 |
一般理论 | 13篇 |
预防医学 | 3760篇 |
眼科学 | 452篇 |
药学 | 1361篇 |
中国医学 | 78篇 |
肿瘤学 | 1739篇 |
出版年
2024年 | 31篇 |
2023年 | 222篇 |
2022年 | 387篇 |
2021年 | 723篇 |
2020年 | 559篇 |
2019年 | 690篇 |
2018年 | 805篇 |
2017年 | 637篇 |
2016年 | 735篇 |
2015年 | 841篇 |
2014年 | 976篇 |
2013年 | 1272篇 |
2012年 | 1810篇 |
2011年 | 1934篇 |
2010年 | 1121篇 |
2009年 | 1041篇 |
2008年 | 1550篇 |
2007年 | 1544篇 |
2006年 | 1478篇 |
2005年 | 1364篇 |
2004年 | 1263篇 |
2003年 | 1126篇 |
2002年 | 1034篇 |
2001年 | 210篇 |
2000年 | 144篇 |
1999年 | 274篇 |
1998年 | 338篇 |
1997年 | 352篇 |
1996年 | 321篇 |
1995年 | 218篇 |
1994年 | 125篇 |
1993年 | 175篇 |
1992年 | 58篇 |
1991年 | 42篇 |
1990年 | 54篇 |
1989年 | 64篇 |
1988年 | 55篇 |
1987年 | 52篇 |
1986年 | 45篇 |
1985年 | 36篇 |
1984年 | 25篇 |
1983年 | 39篇 |
1982年 | 30篇 |
1981年 | 27篇 |
1980年 | 26篇 |
1979年 | 20篇 |
1978年 | 15篇 |
1977年 | 18篇 |
1976年 | 20篇 |
1975年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
Claudia M. Dillier Daniel Trachsel Werner Baulig Claudine Gysin Andreas C. Gerber Markus Weiss 《Journal canadien d'anesthésie》2004,51(1):72-75
PURPOSE: To present a case of laryngeal damage in an infant caused by a too large and inappropriately designed cuffed tracheal tube. CLINICAL FEATURES: A 13-month-old child undergoing cardiac surgery was intubated with an uncuffed endotracheal tube with an internal diameter (ID) of 4.0 mm. Because of an important air leak around the tracheal tube during mechanical ventilation, a cuffed endotracheal tube ID 4.0 mm was inserted. The air leak with the tube cuff not inflated was acceptable at 25 cm H2O airway pressure. After extubation on the third postoperative day, the patient showed increasing stridor and respiratory deterioration. Fibreoptic laryngoscopy of the spontaneously breathing patient showed a large intra-laryngeal web. After surgical removal of the web, the child rapidly recovered and was discharged from the hospital on the 12th postoperative day. Inspection of the 4.0 mm (ID) cuffed tracheal tube revealed a cuff positioned inappropriately high and an increase of 0.7 mm in outer tube diameter compared to the 4.0 mm (ID) uncuffed tracheal tube from the same manufacturer. The tube cuff is likely to be situated within the larynx when placed in accordance to insertion depth formulas or radiological criteria, as used for uncuffed tracheal tubes in children. CONCLUSION: The larger than expected tracheal tube with its intra-laryngeal cuff position in a 13-month-old child likely caused mucosal damage and an inflammatory reaction within the larynx resulting in granulation tissue formation and fibrous healing around the tracheal tube. 相似文献
32.
Burness Gene Wenberg MS RD December 《Journal of the American Dietetic Association》2004,104(8):1297-1299
33.
Sonja H?ller Claudia Valenta 《European journal of pharmaceutics and biopharmaceutics》2007,66(1):120-126
The purpose of the present study was to investigate the influence of different drugs exhibiting different solubility on the viscoelastic properties and on the skin diffusion profile of a ringing gel. In a preliminary rheology study with the placebo gel predominating elastic properties were confirmed and a temperature influence was indicated. Fluconazole, fludrocortisone-acetate, flumethasone-pivalate, flutamide and flufenamic-acid each 1% (w/w) were incorporated into the preparation and oscillatory measurements were performed at temperatures of 25, 28, 32 and 37 degrees C. In all drug containing formulations a high elastic G' value predominated the viscous G' value. The highest G' value could be obtained with the incorporated flumethasone-pivalate. Additionally in almost all cases the G' values decreased with increasing temperature compared to the placebo gel. Additionally in vitro standard diffusion experiments using Franz-type cells and porcine skin were performed. Following rank order of the cumulative drug release after 48 h was obtained: fluconazole>flufenamic-acid>flumethasone-pivalate>flutamide>fludrocortisone-acetate. Furthermore an excellent chemical stability of all incorporated drugs was confirmed over 10 weeks. 相似文献
34.
35.
36.
37.
38.
39.
40.