收费全文 | 57713篇 |
免费 | 3566篇 |
国内免费 | 358篇 |
耳鼻咽喉 | 529篇 |
儿科学 | 1559篇 |
妇产科学 | 1684篇 |
基础医学 | 7581篇 |
口腔科学 | 1377篇 |
临床医学 | 5667篇 |
内科学 | 12618篇 |
皮肤病学 | 1090篇 |
神经病学 | 5784篇 |
特种医学 | 1939篇 |
外国民族医学 | 3篇 |
外科学 | 7887篇 |
综合类 | 443篇 |
一般理论 | 23篇 |
预防医学 | 4018篇 |
眼科学 | 888篇 |
药学 | 3496篇 |
2篇 | |
中国医学 | 142篇 |
肿瘤学 | 4907篇 |
2024年 | 80篇 |
2023年 | 590篇 |
2022年 | 1123篇 |
2021年 | 2149篇 |
2020年 | 1247篇 |
2019年 | 1751篇 |
2018年 | 2024篇 |
2017年 | 1432篇 |
2016年 | 1614篇 |
2015年 | 1879篇 |
2014年 | 2537篇 |
2013年 | 3151篇 |
2012年 | 4765篇 |
2011年 | 4754篇 |
2010年 | 2444篇 |
2009年 | 2230篇 |
2008年 | 3792篇 |
2007年 | 3759篇 |
2006年 | 3338篇 |
2005年 | 3325篇 |
2004年 | 2865篇 |
2003年 | 2541篇 |
2002年 | 2312篇 |
2001年 | 599篇 |
2000年 | 535篇 |
1999年 | 601篇 |
1998年 | 420篇 |
1997年 | 345篇 |
1996年 | 287篇 |
1995年 | 254篇 |
1994年 | 246篇 |
1993年 | 198篇 |
1992年 | 277篇 |
1991年 | 250篇 |
1990年 | 212篇 |
1989年 | 231篇 |
1988年 | 142篇 |
1987年 | 179篇 |
1986年 | 126篇 |
1985年 | 119篇 |
1984年 | 123篇 |
1983年 | 78篇 |
1982年 | 72篇 |
1981年 | 66篇 |
1980年 | 50篇 |
1979年 | 70篇 |
1976年 | 51篇 |
1975年 | 42篇 |
1974年 | 44篇 |
1972年 | 44篇 |
Methods: Six healthy volunteers were anesthetized with desflurane and nitrous oxide. The cooling methods were 1) circulating water (5 [degree sign] Celsius, full-length mattress and cover), 2) forced air (10 [degree sign] Celsius, full-length cover), 3) gastric lavage (500 ml iced water every 10 min), 4) bladder lavage (300 ml iced Ringer's solution every 10 min), and 5) ice-water immersion. Each method was applied for 40 min or until the volunteers' core temperatures approached 34 [degree sign] Celsius. The volunteers were rewarmed to normothermia between treatments. Core cooling rates were evaluated using linear regression.
Results: The first volunteer developed abdominal cramping and diarrhea after gastric lavage. Consequently, the technique was not again attempted. Bladder lavage increased heat loss 10 [nearly =] 10 W and decreased core temperature 0.8 +/- 0.3 [degree sign] Celsius/h (r2 = 0.99 +/- 0.002; means +/- SD). Forced-air and circulating-water cooling comparably increased heat flux, [nearly =] 170 W. Consequently, core cooling rates were similar during the two treatments at 1.7 +/- 0.5 [degree sign] Celsius/h (r2 = 0.99 +/- 0.001) and 1.6 +/- 1.1 [degree sign] Celsius/h (r2 = 0.98 +/- 0.02), respectively. Immersion in an ice water slurry increased heat loss [nearly =] 600-800 W and decreased core temperature 9.7 +/- 4.4 [degree sign] Celsius/h (r sup 2 = 0.98 +/- 0.01). Immersion cooling was associated with an afterdrop of [nearly =] 2 [degree sign] Celsius. 相似文献
Mistakes are inevitable in medicine. To learn how medical mistakes relate to subsequent changes in practice, we surveyed 254 internal medicine house officers. One hundred and fourteen house officers (45%) completed an anonymous questionnaire describing their most significant mistake and their response to it. Mistakes included errors in diagnosis (33%), prescribing (29%), evaluation (21%), and communication (5%) and procedural complications (11%). Patients had serious adverse outcomes in 90% of the cases, including death in 31% of cases. Only 54% of house officers discussed the mistake with their attending physicians, and only 24% told the patients or families. House officers who accepted responsibility for the mistake and discussed it were more likely to report constructive changes in practice. Residents were less likely to make constructive changes if they attributed the mistake to job overload. They were more likely to report defensive changes if they felt the institution was judgmental. Decreasing the work load and closer supervision may help prevent mistakes. To promote learning, faculty should encourage house officers to accept responsibility and to discuss their mistakes. 相似文献