全文获取类型
收费全文 | 1546篇 |
免费 | 142篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 74篇 |
妇产科学 | 20篇 |
基础医学 | 177篇 |
口腔科学 | 56篇 |
临床医学 | 136篇 |
内科学 | 428篇 |
皮肤病学 | 12篇 |
神经病学 | 83篇 |
特种医学 | 197篇 |
外科学 | 119篇 |
综合类 | 83篇 |
预防医学 | 83篇 |
眼科学 | 24篇 |
药学 | 86篇 |
中国医学 | 6篇 |
肿瘤学 | 104篇 |
出版年
2023年 | 14篇 |
2022年 | 10篇 |
2021年 | 16篇 |
2020年 | 8篇 |
2019年 | 27篇 |
2018年 | 25篇 |
2017年 | 18篇 |
2016年 | 37篇 |
2015年 | 65篇 |
2014年 | 36篇 |
2013年 | 66篇 |
2012年 | 48篇 |
2011年 | 53篇 |
2010年 | 57篇 |
2009年 | 49篇 |
2008年 | 62篇 |
2007年 | 64篇 |
2006年 | 65篇 |
2005年 | 46篇 |
2004年 | 48篇 |
2003年 | 49篇 |
2002年 | 44篇 |
2001年 | 65篇 |
2000年 | 44篇 |
1999年 | 43篇 |
1998年 | 38篇 |
1997年 | 50篇 |
1996年 | 42篇 |
1995年 | 34篇 |
1994年 | 32篇 |
1993年 | 31篇 |
1992年 | 28篇 |
1991年 | 34篇 |
1990年 | 27篇 |
1989年 | 43篇 |
1988年 | 37篇 |
1987年 | 19篇 |
1986年 | 27篇 |
1985年 | 31篇 |
1984年 | 13篇 |
1983年 | 11篇 |
1982年 | 16篇 |
1981年 | 11篇 |
1980年 | 10篇 |
1978年 | 11篇 |
1977年 | 11篇 |
1976年 | 15篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1966年 | 8篇 |
排序方式: 共有1698条查询结果,搜索用时 15 毫秒
1.
2.
3.
Alfred E Buxton Hugh Calkins David J Callans John P DiMarco John D Fisher H Leon Greene David E Haines David L Hayes Paul A Heidenreich John M Miller Athena Poppas Eric N Prystowsky Mark H Schoenfeld Peter J Zimetbaum Paul A Heidenreich David C Goff Frederick L Grover David J Malenka Eric D Peterson Martha J Radford Rita F Redberg 《Journal of the American College of Cardiology》2006,48(11):2360-2396
4.
Probability of appendicitis before and after observation 总被引:6,自引:0,他引:6
STUDY OBJECTIVE: To examine patients with abdominal pain for changes in probability of appendicitis during observation. STUDY DESIGN: Retrospective cohort study. SETTING: University-affiliated community hospital. METHODS: 252 patients with abdominal pain who were examined underwent short-term (10.4 hours) observation (95% confidence interval [CI], 8.7, 12.1) before the decision to operate during a one-year period. Alvarado's scoring system and a probability-of-diagnosis nomogram were used to assign scores and estimate probability of appendicitis. MEASUREMENTS AND RESULTS: In the study group, mean score of patients with appendicitis increased after observation from 6.8 (95% CI, 6.2, 7.4) to 7.8 (95% CI, 7.3, 8.3), corresponding to a change in probability of appendicitis from 50% to 65%. Mean score of patients without appendicitis decreased from 3.8 (95% CI, 3.5, 4.1) to 1.6 (95% CI, 1.58, 1.62), corresponding to a change in probability from 35% to 22%. The difference between mean scores for patients with and without appendicitis increased from 2.6 (95% CI, 2.0, 3.2) to 6.2 (95% CI, 6.15, 6.25) during observation. The study group initially had intermediate probability of appendicitis (score, 4.35; 95% CI, 4.04, 4.66) compared with high probability for patients who went directly to surgery after their initial evaluation (63 patients; score, 7.59; 95% CI, 7.05, 8.73) and low probability for patients with abdominal pain who were sent home after their initial evaluation without observation or surgery (2,097 patients; score, 1.87; 95% CI, 1.48, 2.26). CONCLUSION: In this group of patients with intermediate initial probability of appendicitis, observation improved the ability to distinguish patients with from those without appendicitis. 相似文献
5.
6.
7.
Hausegger KA; Cragg AH; Lammer J; Lafer M; Fluckiger F; Klein GE; Sternthal MH; Pilger E 《Radiology》1994,190(1):199
8.
Subgingival plaque samples from three discrete sites in each of eight patients with adult chronic periodontitis were used to determine the ability of 0.001, 0.01, 0.1 and 1.0 mM chlorhexidine to inhibit bacterial proteolytic activity. This activity was measured by monitoring the increase in relative fluorescence (excitation and emission wavelengths of 495 and 525 nm, respectively) accompanying the degradation of fluorescein isothiocyanate (FITC)-labelled bovine serum albumin or FITC-labelled transferrin. Chlorhexidine at concentrations of as low as 0.01 mM inhibited the proteolytic degradation of both substrates by more than 50%. As the growth of dental plaque bacteria is dependent upon the liberation of nutrients (amino acids, peptides and carbohydrates) from host-derived macromolecules, similar effects in vivo might explain the ability of chlorhexidine to inhibit plaque formation at subminimal inhibitory concentrations. 相似文献
9.
10.