全文获取类型
收费全文 | 2001篇 |
免费 | 265篇 |
国内免费 | 45篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 54篇 |
妇产科学 | 40篇 |
基础医学 | 185篇 |
口腔科学 | 40篇 |
临床医学 | 257篇 |
内科学 | 517篇 |
皮肤病学 | 29篇 |
神经病学 | 211篇 |
特种医学 | 78篇 |
外科学 | 404篇 |
综合类 | 25篇 |
预防医学 | 151篇 |
眼科学 | 40篇 |
药学 | 122篇 |
中国医学 | 1篇 |
肿瘤学 | 147篇 |
出版年
2023年 | 15篇 |
2022年 | 18篇 |
2021年 | 35篇 |
2020年 | 33篇 |
2019年 | 18篇 |
2018年 | 38篇 |
2017年 | 54篇 |
2016年 | 61篇 |
2015年 | 99篇 |
2014年 | 165篇 |
2013年 | 188篇 |
2012年 | 96篇 |
2011年 | 80篇 |
2010年 | 129篇 |
2009年 | 129篇 |
2008年 | 71篇 |
2007年 | 57篇 |
2006年 | 61篇 |
2005年 | 48篇 |
2004年 | 43篇 |
2003年 | 55篇 |
2002年 | 45篇 |
2001年 | 48篇 |
2000年 | 25篇 |
1999年 | 43篇 |
1998年 | 42篇 |
1997年 | 51篇 |
1996年 | 39篇 |
1995年 | 35篇 |
1994年 | 22篇 |
1993年 | 15篇 |
1992年 | 15篇 |
1991年 | 17篇 |
1990年 | 16篇 |
1989年 | 15篇 |
1988年 | 18篇 |
1987年 | 14篇 |
1986年 | 20篇 |
1985年 | 25篇 |
1983年 | 23篇 |
1982年 | 16篇 |
1979年 | 13篇 |
1978年 | 21篇 |
1977年 | 14篇 |
1976年 | 15篇 |
1975年 | 14篇 |
1974年 | 15篇 |
1973年 | 12篇 |
1972年 | 13篇 |
1971年 | 16篇 |
排序方式: 共有2311条查询结果,搜索用时 0 毫秒
61.
Effects of Lung Cotransplantation on Cardiac Allograft Tolerance Across a Full Major Histocompatibility Complex Barrier in Miniature Swine 下载免费PDF全文
M. L. L. Madariaga P. J. Spencer S. G. Michel G. M. La Muraglia II M. J. O’Neil E. C. Mannon C. Leblang I. A. Rosales R. B. Colvin D. H. Sachs J. C. Madsen 《American journal of transplantation》2016,16(3):979-986
A 12‐day course of high‐dose tacrolimus induces tolerance of major histocompatibility complex–mismatched lung allografts in miniature swine but does not induce tolerance of heart allografts unless a kidney is cotransplanted. To determine whether lungs share with kidneys the ability to induce cardiac allograft tolerance, we investigated heart–lung cotransplantation using the same induction protocol. Hearts (n = 3), heart–kidneys (n = 3), lungs (n = 6), and hearts–lungs (n = 3) were transplanted into fully major histocompatibility complex–mismatched recipients treated with high‐dose tacrolimus for 12 days. Serial biopsy samples were used to evaluate rejection, and in vitro assays were used to detect donor responsiveness. All heart–kidney recipients and five of six lung recipients demonstrated long‐term graft survival for longer than 272 days, while all heart recipients rejected their allografts within 35 days. Tolerant recipients remained free of alloantibody and showed persistent donor‐specific unresponsiveness by cell‐mediated lympholysis/mixed‐lymphocyte reaction. In contrast, heart–lung recipients demonstrated rejection of both allografts (days 47, 55, and 202) and antidonor responsiveness in vitro. In contrast to kidneys, lung cotransplantation leads to rejection of both heart and lung allografts, indicating that lungs do not have the same tolerogenic capacity as kidneys. We conclude that cells or cell products present in kidney, but not heart or lung allografts, have a unique capacity to confer unresponsiveness on cotransplanted organs, most likely by amplifying host regulatory mechanisms. 相似文献
62.
Fromer Marc W. Scoggins Charles R. Egger Michael E. Philips Prejesh McMasters Kelly M. Martin II Robert C. G. 《Annals of surgical oncology》2022,29(2):905-912
Annals of Surgical Oncology - Early recurrence following liver resection for metastatic colorectal cancer generally portends poor survival. We sought to identify factors associated with early... 相似文献
63.
64.
Stuart Richer Shana Patel Shivani Sockanathan Lawrence J. Ulanski II Luke Miller Carla Podella 《Nutrients》2014,6(10):4404-4420
Background: Longevinex® (L/RV) is a low dose hormetic over-the-counter (OTC) oral resveratrol (RV) based matrix of red wine solids, vitamin D3 and inositol hexaphosphate (IP6) with established bioavailability, safety, and short-term efficacy against the earliest signs of human atherosclerosis, murine cardiac reperfusion injury, clinical retinal neovascularization, and stem cell survival. We previously reported our short-term findings for dry and wet age-related macular degeneration (AMD) patients. Today we report long term (two to three year) clinical efficacy. Methods: We treated three patients including a patient with an AMD treatment resistant variant (polypoidal retinal vasculature disease). We evaluated two clinical measures of ocular structure (fundus autofluorescent imaging and spectral domain optical coherence extended depth choroidal imaging) and qualitatively appraised changes in macular pigment volume. We further evaluated three clinical measures of visual function (Snellen visual acuity, contrast sensitivity, and glare recovery to a cone photo-stress stimulus). Results: We observed broad bilateral improvements in ocular structure and function over a long time period, opposite to what might be expected due to aging and the natural progression of the patient’s pathophysiology. No side effects were observed. Conclusions: These three cases demonstrate that application of epigenetics has long-term efficacy against AMD retinal disease, when the retinal specialist has exhausted other therapeutic modalities. 相似文献
65.
66.
67.
Gregory Phillips II Lisa B. Hightow-Weidman Sheldon D. Fields Thomas P. Giordano Angulique Y. Outlaw Bonnie Halpern-Felsher 《AIDS care》2014,26(7):827-834
Adolescents and young adults (ages 13–24) in the USA are frequently exposed to violence in their community and home. While studies have examined the prevalence and impact of violence exposure among adolescents, there is a lack of data focusing specifically on adolescent men of color who have sex with men. Eight demonstration sites funded through a Special Projects of National Significance (SPNS) Initiative recruited 363 HIV-positive racial/ethnic minority young men who have sex with men (YMSM) for a longitudinal study between 2006 and 2009. Over two-thirds of participants (83.8%) had witnessed community violence, 55.1% in the prior three months. Witnessing violence committed with a deadly weapon was significantly associated with being African-American, having ever used drugs, and drinking alcohol in the prior two weeks. Fear of violence in the community was significantly associated with depressive symptomatology, having less than a high school degree, not possessing health insurance, and site of enrollment. Having been emotionally or physically abused by a parent or caretaker was significantly associated with depressive symptomatology, attempting suicide, site of enrollment, and increased age. Witnessing violence with a deadly weapon was significantly associated with alcohol and drug use but not with high-risk sexual behaviors. As this was one of the first studies on the prevalence and correlates of violence exposure among racial/ethnic minority YMSM living with HIV, the findings can be used to inform the development of culturally appropriate resilience-focused interventions to address the aftereffects of violence exposures and help develop social support systems outside of the family. 相似文献
68.
69.
Plant roots use a patterning mechanism to position lateral root branches toward available water 总被引:1,自引:0,他引:1
70.
K.M. Olszowy J. Lavelle K. Rachfal S. Hempstead K. Drouin J.M. Darcy II C. Reiber R.M. Garruto 《Public health》2014