全文获取类型
收费全文 | 224篇 |
免费 | 21篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 8篇 |
妇产科学 | 4篇 |
基础医学 | 32篇 |
口腔科学 | 5篇 |
临床医学 | 26篇 |
内科学 | 21篇 |
神经病学 | 10篇 |
特种医学 | 12篇 |
外科学 | 43篇 |
综合类 | 3篇 |
预防医学 | 18篇 |
眼科学 | 4篇 |
药学 | 18篇 |
肿瘤学 | 15篇 |
出版年
2022年 | 2篇 |
2020年 | 3篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 5篇 |
2013年 | 8篇 |
2012年 | 13篇 |
2011年 | 12篇 |
2010年 | 4篇 |
2009年 | 4篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 9篇 |
2001年 | 12篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 12篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 8篇 |
1993年 | 4篇 |
1992年 | 7篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 9篇 |
1984年 | 1篇 |
1983年 | 7篇 |
1981年 | 1篇 |
1980年 | 5篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有245条查询结果,搜索用时 11 毫秒
91.
Purpose
A continuous cardiac output monitor based on arterial pressure waveform (FloTrac™/Vigileo™; Edwards Lifesciences, Irvine, CA) is now approved for use in adults but not in children. This device is minimally invasive, calculates cardiac output continuously and in real time, and is easy to use. Our study sought to validate the FloTrac™ with the pulmonary artery catheter (PAC) intermittent thermodilution technique in pediatric cardiac patients. 相似文献92.
Hoenerhoff MJ Pandiri AR Lahousse SA Hong HH Ton TV Masinde T Auerbach SS Gerrish K Bushel PR Shockley KR Peddada SD Sills RC 《Toxicologic pathology》2011,39(4):678-699
Hepatocellular carcinoma (HCC) is an important cause of morbidity and mortality worldwide. Although the risk factors of human HCC are well known, the molecular pathogenesis of this disease is complex, and in general, treatment options remain poor. The use of rodent models to study human cancer has been extensively pursued, both through genetically engineered rodents and rodent models used in carcinogenicity and toxicology studies. In particular, the B6C3F1 mouse used in the National Toxicology Program (NTP) two-year bioassay has been used to evaluate the carcinogenic effects of environmental and occupational chemicals, and other compounds. The high incidence of spontaneous HCC in the B6C3F1 mouse has challenged its use as a model for chemically induced HCC in terms of relevance to the human disease. Using global gene expression profiling, we identify the dysregulation of several mediators similarly altered in human HCC, including re-expression of fetal oncogenes, upregulation of protooncogenes, downregulation of tumor suppressor genes, and abnormal expression of cell cycle mediators, growth factors, apoptosis regulators, and angiogenesis and extracellular matrix remodeling factors. Although major differences in etiology and pathogenesis remain between human and mouse HCC, there are important similarities in global gene expression and molecular pathways dysregulated in mouse and human HCC. These data provide further support for the use of this model in hazard identification of compounds with potential human carcinogenicity risk, and may help in better understanding the mechanisms of tumorigenesis resulting from chemical exposure in the NTP two-year carcinogenicity bioassay. 相似文献
93.
94.
Prognostic significance of bone invasion for oral cavity squamous cell carcinoma considered T1/T2 by American joint committee on cancer size criteria 下载免费PDF全文
95.
96.
VE Reyes-Ortiz W Calderón-Alicea R Castillo JJ Cintrón-García JJ Cintrón-García L Colón Cruz A Hernández-Mu?oz I Irizarry-Pérez I Lockward C Neste-Laboy M Ortíz-León A Peréz-Homar J Pérez W Ramírez-López L Rivera D Scholz M Soto-Ortíz A Torres-García 《The West Indian medical journal》2014,63(6):616-619
97.
Simon Craig Andis Graudins Stuart R Dalziel Colin VE Powell Franz E Babl 《Emergency medicine Australasia : EMA》2019,31(1):29-34
In this series we address important topics for clinicians who participate in research as part of their work in the ED. The overarching goal of clinical research is to improve care and determine which treatment is best. Yet, defining and measuring outcomes – what is ‘best’ – can be one of the most difficult steps in the design of a study, in particular when answers to research questions cannot be captured in simple binary results. This article addresses how to choose outcome measures and highlights the increasingly important concept of core outcome sets. 相似文献
98.
T. C. Jenkins S. A. Stella L. Cervantes B. C. Knepper A. L. Sabel C. S. Price L. Shockley M. E. Hanley P. S. Mehler W. J. Burman 《Infection》2013,41(1):135-144
Purpose
Community-acquired pneumonia (CAP) is the most common infection leading to hospitalization in the USA. The objective of this study was to evaluate management practices for inpatient CAP in relation to Infectious Diseases Society of America/American Thoracic Society (IDSA/ATS) guidelines to identify opportunities for antibiotic and health care resource stewardship.Methods
This was a retrospective cohort study of adults hospitalized for CAP at a single institution from 15 April 2008 to 31 May 2009.Results
Of the 209 patients with CAP who presented to Denver Health Medical Center during the study period and were hospitalized, 166 (79 %) and 43 (21 %) were admitted to a medical ward and the intensive care unit (ICU), respectively. Sixty-one (29 %) patients were candidates for outpatient therapy per IDSA/ATS guidance with a CURB-65 score of 0 or 1 and absence of hypoxemia. Sputum cultures were ordered for 110 specimens; however, an evaluable sample was obtained in only 49 (45 %) cases. Median time from antibiotic initiation to specimen collection was 11 [interquartile range (IQR) 6–19] h, and a potential pathogen was identified in only 18 (16 %) cultures. Blood cultures were routinely obtained for both non-ICU (81 %) and ICU (95 %) cases, but 15 of 36 (42 %) positive cultures were false-positive results. The most common antibiotic regimen was ceftriaxone + azithromycin (182, 87 % cases). Discordant with IDSA/ATS recommendations, oral step-down therapy consisted of a new antibiotic class in 120 (66 %), most commonly levofloxacin (101, 55 %). Treatment durations were typically longer than suggested with a median of 10 (IQR 8–12) days.Conclusions
In this cohort of patients hospitalized for CAP, management was frequently inconsistent with IDSA/ATS guideline recommendations, revealing potential targets to reduce unnecessary antibiotic and healthcare resource utilization. 相似文献99.
Nigel W Crawford Domenic R Cincotta Alissa Lim Colin VE Powell 《BMC complementary and alternative medicine》2006,6(1):16-10
Background
A high prevalence of CAM use has been documented worldwide in children and adolescents with chronic illnesses. Only a small number of studies, however, have been conducted in the United Kingdom. The primary aim of this study was to examine the use of CAM by children and adolescents with a wide spectrum of acute and chronic medical problems in a tertiary children's hospital in Wales. 相似文献100.