全文获取类型
收费全文 | 7953篇 |
免费 | 577篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 76篇 |
儿科学 | 240篇 |
妇产科学 | 235篇 |
基础医学 | 1185篇 |
口腔科学 | 140篇 |
临床医学 | 860篇 |
内科学 | 1614篇 |
皮肤病学 | 206篇 |
神经病学 | 764篇 |
特种医学 | 165篇 |
外科学 | 698篇 |
综合类 | 73篇 |
一般理论 | 9篇 |
预防医学 | 934篇 |
眼科学 | 120篇 |
药学 | 651篇 |
中国医学 | 19篇 |
肿瘤学 | 577篇 |
出版年
2024年 | 12篇 |
2023年 | 85篇 |
2022年 | 158篇 |
2021年 | 310篇 |
2020年 | 191篇 |
2019年 | 263篇 |
2018年 | 291篇 |
2017年 | 186篇 |
2016年 | 242篇 |
2015年 | 267篇 |
2014年 | 334篇 |
2013年 | 420篇 |
2012年 | 681篇 |
2011年 | 686篇 |
2010年 | 396篇 |
2009年 | 310篇 |
2008年 | 531篇 |
2007年 | 511篇 |
2006年 | 498篇 |
2005年 | 445篇 |
2004年 | 372篇 |
2003年 | 354篇 |
2002年 | 318篇 |
2001年 | 37篇 |
2000年 | 33篇 |
1999年 | 37篇 |
1998年 | 62篇 |
1997年 | 51篇 |
1996年 | 34篇 |
1995年 | 36篇 |
1994年 | 31篇 |
1993年 | 19篇 |
1992年 | 17篇 |
1991年 | 24篇 |
1990年 | 13篇 |
1989年 | 8篇 |
1988年 | 13篇 |
1987年 | 17篇 |
1986年 | 17篇 |
1985年 | 29篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 18篇 |
1981年 | 20篇 |
1980年 | 21篇 |
1979年 | 13篇 |
1977年 | 8篇 |
1974年 | 9篇 |
1973年 | 12篇 |
1928年 | 13篇 |
排序方式: 共有8566条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
Elfstrom KM Hatefi D Kilgo PD Puskas JD Thourani VH Guyton RA Halkos ME 《Journal of cardiac surgery》2012,27(1):13-19
Abstract Background: Cardiac surgical patients with postoperative complications frequently require prolonged intensive care yet survive to hospital discharge. Methods: From January 1, 2002 to December 31, 2007, 11,541 consecutive patients underwent cardiac operations at a single academic institution. Of these, 11,084 (95.9%) survived to hospital discharge and comprised the study sample. Patients were retrospectively categorized into four groups according to intensive care unit (ICU) length of stay (LOS): <3 days, three to seven days, 7 to 14 days, and >14 days. Survival at 12 months was determined using the Social Security Death Index. Kaplan–Meier (KM) survival curves and Cox proportional hazards regression modeling (hazard ratio, HR) were used to analyze group differences in survival. Results: One‐year survival among the four groups according to ICU LOS was: <3 days, 97.0% (8407/8666); three to seven days, 91.2% (1481/1625); 7 to 14 days, 87.9% (356/405); and >14 days, 68.3% (265/388) (p < 0.001). Using multivariable regression analysis, adjusted overall mortality was significantly greater in patients with ICU LOS of three to seven days (HR = 1.51), 7 to 14 days (HR = 1.40), and >14 days (HR = 1.90) compared to patients with ICU LOS <3 days. Mortality among patients who survived more than six months postsurgery was significantly greater in patients with ICU LOS of three to seven days (HR = 1.37), 7 to 14 days (HR = 1.34), and >14 days (HR = 1.63). Conclusions: Although cardiac surgery patients with major postoperative complications frequently survive to hospital discharge, survival after discharge is significantly reduced in patients requiring prolonged ICU care. Reduced survival in patients with a high risk of complications and anticipated long ICU stays should be considered when discussing surgical versus nonsurgical options. (J Card Surg 2012;27:13‐19) 相似文献
996.
Fazeli PK Bredella MA Freedman L Thomas BJ Breggia A Meenaghan E Rosen CJ Klibanski A 《Journal of bone and mineral research》2012,27(9):1864-1871
Women with anorexia nervosa (AN) have elevated marrow fat mass despite low visceral and subcutaneous fat depots, which is inversely associated with bone mineral density (BMD). Whether marrow fat mass remains persistently elevated or decreases with recovery from AN is currently unknown. In this study, we investigated changes in marrow fat in women who have recovered from AN (AN-R). We also studied the relationship between preadipocyte factor (Pref)-1—a member of the EGF-like family of proteins and regulator of adipocyte and osteoblast differentiation—and fat depots and BMD in AN-R compared with women with AN and healthy controls (HC). We studied 29 women: 14 with active or recovered AN (30.7 + 2.2 years [mean ± SEM]) and 15 normal-weight controls (27.8 ± 1.2 years). We measured marrow adipose tissue (MAT) of the L4 vertebra and femur by 1H-magnetic resonance spectroscopy; BMD of the spine, hip, and total body by DXA; and serum Pref-1 and leptin levels. We found that MAT of the L4 vertebra was significantly lower in AN-R compared with AN (p = 0.03) and was comparable to levels in HC. Pref-1 levels were also significantly lower in AN-R compared with AN (p = 0.02) and comparable to levels in healthy controls. Although Pref-1 was positively associated with MAT of the L4 vertebra in AN (R = 0.94; p = 0.002), we found that it was inversely associated with MAT of the L4 vertebra in HC (R = −0.71; p = 0.004). Therefore, we have shown that MAT and Pref-1 levels decrease with recovery from AN. Our data suggest that Pref-1 may have differential effects in states of nutritional deprivation compared with nutritional sufficiency. © 2012 American Society for Bone and Mineral Research. 相似文献
997.
This article explores the provision and organisation of critical care services in the UK and examines the issues surrounding admission to, discharge from and the withholding of critical care. 相似文献
998.
999.
1000.
Ming Yan Marie-Claude Gingras Elaine A. Dunlop Yann Nou?t Fanny Dupuy Zahra Jalali Elite Possik Barry J. Coull Dmitri Kharitidi Anders Bondo Dydensborg Brandon Faubert Miriam Kamps Sylvie Sabourin Rachael S. Preston David Mark Davies Taren Roughead La?titia Chotard Maurice A.M. van Steensel Russell Jones Andrew R. Tee Arnim Pause 《The Journal of clinical investigation》2014,124(6):2640-2650