收费全文 | 2644篇 |
免费 | 112篇 |
国内免费 | 59篇 |
耳鼻咽喉 | 38篇 |
儿科学 | 25篇 |
妇产科学 | 79篇 |
基础医学 | 300篇 |
口腔科学 | 43篇 |
临床医学 | 282篇 |
内科学 | 268篇 |
皮肤病学 | 58篇 |
神经病学 | 272篇 |
特种医学 | 30篇 |
外科学 | 231篇 |
综合类 | 497篇 |
预防医学 | 342篇 |
眼科学 | 31篇 |
药学 | 188篇 |
中国医学 | 93篇 |
肿瘤学 | 38篇 |
2023年 | 21篇 |
2022年 | 52篇 |
2021年 | 54篇 |
2020年 | 54篇 |
2019年 | 76篇 |
2018年 | 58篇 |
2017年 | 52篇 |
2016年 | 61篇 |
2015年 | 76篇 |
2014年 | 137篇 |
2013年 | 193篇 |
2012年 | 157篇 |
2011年 | 198篇 |
2010年 | 138篇 |
2009年 | 134篇 |
2008年 | 126篇 |
2007年 | 162篇 |
2006年 | 115篇 |
2005年 | 104篇 |
2004年 | 81篇 |
2003年 | 107篇 |
2002年 | 82篇 |
2001年 | 84篇 |
2000年 | 67篇 |
1999年 | 52篇 |
1998年 | 25篇 |
1997年 | 36篇 |
1996年 | 37篇 |
1995年 | 23篇 |
1994年 | 31篇 |
1993年 | 30篇 |
1992年 | 16篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1980年 | 6篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1973年 | 6篇 |
1972年 | 11篇 |
1971年 | 4篇 |
1970年 | 5篇 |
1969年 | 4篇 |
Background:
Initial resistance to antibiotics is the main reason for the failure of Helicobacter pylori (H. pylori) eradication in children.Objectives:
As we commonly face high antibiotic resistance rates in children, we aimed to determine the susceptibility of H. pylori to common antibiotics.Patients and Methods:
In this cross-sectional in vitro study, 169 children younger than 14 years with clinical diagnosis of peptic ulcer underwent upper gastrointestinal endoscopy. Biopsy specimens from stomach and duodenum were cultured. In isolated colonies, tests of catalase, urease, and oxidase as well as gram staining were performed. After confirming the colonies as H. pylori, the antibiogram was obtained using disk diffusion method.Results:
Culture for H. pylori was positive in 12.3% of the specimens, urease test in 21.3%, serological test in 18.9% and stool antigen test was positive in 21.9%. We could show high specificity but moderate sensitivity of both histological and H. pylori stool antigen tests to detect H. pylori. The overall susceptibility to metronidazole was 42.9%, amoxicillin 95.2%, clarithromycin 85.7%, furazolidone 61.9%, azithromycin 81.0%, and tetracycline 76.2% with the highest resistance to metronidazole and the lowest to clarithromycin.Conclusions:
In our region, there is high resistance of H. pylori to some antibiotics including metronidazole and furazolidone among affected children. To reduce the prevalence of this antibiotic resistance, more controlled use of antibiotics should be considered in children. 相似文献OBJECTIVE:
to test a theoretical model based on the Parent-Based Expansion of the Theory of Planned Behavior examining relation between selected parental, teenager and cultural variables and Latino teenagers'' intentions to engage in sexual behavior.METHOD:
a cross-sectional correlational design based on a secondary data analysis of 130 Latino parent and teenager dyads.RESULTS:
regression and path analysis procedures were used to test seven hypotheses and the results demonstrated partial support for the model. Parent familism and knowledge about sex were significantly associated with parents'' attitudes toward sexual communication with their teenagers. Parent Latino acculturation was negatively associated with parents'' self-efficacy toward sexual communication with their teenagers and positevely associated with parents'' subjective norms toward sexual communication with their teenagers. Teenager knowledge about sex was significantly associated with higher levels of teenagers'' attitudes and subjective norms about sexual communication with parents. Only the predictor of teenagers'' attitudes toward having sex in the next 3 months was significantly associated with teenagers'' intentions to have sex in the next 3 months.CONCLUSION:
the results of this study provide important information to guide future research that can inform development of interventions to prevent risky teenager sexual behavior among Latinos. 相似文献Method: 166-second year OT undergraduate students participated. All completed three PBL courses and seven weeks of clinical fieldwork studies. Data collection included students’ grades in PBL course (based on PBL evaluation forms) and in clinical fieldwork studies (based on preceptor’s evaluation and a written assignment).
Results: Pearson correlations revealed significant correlations between PBL grades and clinical fieldwork studies grades. T-test analysis between students who are native Hebrew speakers and those who are native Arabic speakers revealed significant differences in PBL grades.
Conclusions: Findings imply partial congruence between students’ grades in the PBL course and their achievements in the fieldwork studies. Findings might suggest that adjustments should be made in order to assist students from minorities (challenged by language requirements) in gaining higher grades in the PBL program.
- Implications for Rehabilitation
Problem-Based Learning (PBL) is an educational method, which fosters independent, self-directed study in small groups.
PBL studies have the potential to prepare students for their clinical experience during studies.
The PBL program should be adjusted for students from minorities (challenged by language requirements and different cultural backgrounds) in order to assist them in gaining more benefits from the program.