全文获取类型
收费全文 | 1062篇 |
免费 | 60篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 87篇 |
妇产科学 | 12篇 |
基础医学 | 103篇 |
口腔科学 | 25篇 |
临床医学 | 132篇 |
内科学 | 216篇 |
皮肤病学 | 20篇 |
神经病学 | 31篇 |
特种医学 | 304篇 |
外科学 | 66篇 |
综合类 | 12篇 |
预防医学 | 28篇 |
眼科学 | 8篇 |
药学 | 25篇 |
肿瘤学 | 62篇 |
出版年
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 14篇 |
2016年 | 7篇 |
2015年 | 15篇 |
2014年 | 17篇 |
2013年 | 22篇 |
2012年 | 9篇 |
2011年 | 10篇 |
2010年 | 28篇 |
2009年 | 26篇 |
2008年 | 11篇 |
2007年 | 29篇 |
2006年 | 17篇 |
2005年 | 21篇 |
2004年 | 20篇 |
2003年 | 8篇 |
2002年 | 11篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 21篇 |
1998年 | 94篇 |
1997年 | 69篇 |
1996年 | 76篇 |
1995年 | 52篇 |
1994年 | 54篇 |
1993年 | 61篇 |
1992年 | 11篇 |
1991年 | 11篇 |
1990年 | 15篇 |
1989年 | 39篇 |
1988年 | 25篇 |
1987年 | 39篇 |
1986年 | 23篇 |
1985年 | 29篇 |
1984年 | 23篇 |
1983年 | 16篇 |
1982年 | 22篇 |
1981年 | 23篇 |
1980年 | 28篇 |
1979年 | 6篇 |
1978年 | 16篇 |
1977年 | 18篇 |
1976年 | 21篇 |
1975年 | 13篇 |
1959年 | 4篇 |
1956年 | 3篇 |
1954年 | 3篇 |
1949年 | 3篇 |
排序方式: 共有1133条查询结果,搜索用时 15 毫秒
1.
2.
OBJECTIVE: Prevotella intermedia has been reported to be associated with periodontal disease whilst P. nigrescens has predominantly been isolated from more specific conditions and healthy sites. The aim of the present study was to compare the enzyme activity of these species.
MATERIALS AND METHODS Nine strains of P. intermedio and 12 strains of P. nigrescens were studied. Lipolytic. saccharolytic, nucleolytic and proteolytic activity was determined by traditional microbiological and chromo-genic substrate methods.
RESULTS: All strains hydrolysed gelatine, casein. DNA and RNA. Lipase activity was produced by all strains except P. nigrescens ATCC 33563T . Lipolytic activity of P. nigrescens strains decreased as the environmental glucose concentration was increased. Only two strains, both P. intermedia , hydrolysed benzyl-arg-p-nitroanilide. All strains hydrolysed alkaline pnitrophenolphosphate (except P. intermedia DAL 100). produced glycylprolyl dipeptidase activity and demonstrated elastase-like activity. All but three strains (2 P. intermedia and I P. nigrescens) hydrolysed suc-ala-ala-pro-phe-p-nitroanilide. Overall, no qualitatively analysed enzyme activity was exclusive to all strains of either species. Quantitatively analysed activity exhibited a high degree of variability both within and between species.
CONCLUSIONS: P. intermedia and P. nigrescens degrade natural and synthetic substrates, but intra- and interspec-ies activity is variable. 相似文献
MATERIALS AND METHODS Nine strains of P. intermedio and 12 strains of P. nigrescens were studied. Lipolytic. saccharolytic, nucleolytic and proteolytic activity was determined by traditional microbiological and chromo-genic substrate methods.
RESULTS: All strains hydrolysed gelatine, casein. DNA and RNA. Lipase activity was produced by all strains except P. nigrescens ATCC 33563
CONCLUSIONS: P. intermedia and P. nigrescens degrade natural and synthetic substrates, but intra- and interspec-ies activity is variable. 相似文献
3.
4.
5.
6.
The inter‐rater reliability between nurse‐assessors clinically assessing infection of chronic wounds using the WUWHS criteria 下载免费PDF全文
Jacqueline JHHM Vestjens Armand ALM Rondas Richard RJ White Samantha SL Holloway 《International wound journal》2018,15(1):8-15
The aim of this study was to determine the inter‐rater reliability between one expert‐nurse and four clinical‐nurses who were asked to clinically assess infection of chronic wounds by using the World Union of Wound Healing Societies (WUWHS) criteria. A quasi‐experimental design was used to collect the data. In comparison to phase 1 in which ‘open questions’ were asked, in phase 2 a pre‐printed form (checklist) was introduced. In both phases, 55 chronic wounds were clinically assessed. For each WUWHS criterion the inter‐rater reliability of signs and symptoms was expressed by Cohens Kappa (κ). A substantial agreement (κ ≥ 0·6) was considered as adequate. In both phases pocketing (p < 0·02), and erythema (p < 0·004) scored statistically significant results. Phase 2 showed higher inter‐rater agreements compared with phase 1 (three substantial agreements (easily bleeding/friable granulation tissue, delayed healing, increasing exudate), an almost perfect‐ and a perfect agreement for malodour and pain, respectively. According to the results it can be concluded that the clinical assessment of infection of chronic wounds may be better supported by a pre‐printed form than making use of an ‘open questions’ form. To provide this with a higher level of evidence, there is need for more well conducted studies. 相似文献
7.
Wierdsma NJ Peters JH Weijs PJ Keur MB Girbes AR van Bodegraven AA Beishuizen A 《Critical care (London, England)》2011,15(6):R264-9
Introduction
Malabsorption, which is frequently underdiagnosed in critically ill patients, is clinically relevant with regard to nutritional balance and nutritional management. We aimed to validate the diagnostic accuracy of fecal weight as a biomarker for fecal loss and additionally to assess fecal macronutrient contents and intestinal absorption capacity in ICU patients. 相似文献8.
9.