全文获取类型
收费全文 | 31967篇 |
免费 | 1725篇 |
国内免费 | 134篇 |
专业分类
耳鼻咽喉 | 568篇 |
儿科学 | 743篇 |
妇产科学 | 669篇 |
基础医学 | 4301篇 |
口腔科学 | 2441篇 |
临床医学 | 2464篇 |
内科学 | 6962篇 |
皮肤病学 | 663篇 |
神经病学 | 2757篇 |
特种医学 | 646篇 |
外国民族医学 | 2篇 |
外科学 | 3208篇 |
综合类 | 161篇 |
一般理论 | 7篇 |
预防医学 | 3610篇 |
眼科学 | 388篇 |
药学 | 2141篇 |
中国医学 | 258篇 |
肿瘤学 | 1837篇 |
出版年
2024年 | 40篇 |
2023年 | 309篇 |
2022年 | 750篇 |
2021年 | 1211篇 |
2020年 | 812篇 |
2019年 | 972篇 |
2018年 | 1118篇 |
2017年 | 854篇 |
2016年 | 954篇 |
2015年 | 1060篇 |
2014年 | 1419篇 |
2013年 | 1694篇 |
2012年 | 2555篇 |
2011年 | 2832篇 |
2010年 | 1394篇 |
2009年 | 1092篇 |
2008年 | 2004篇 |
2007年 | 1959篇 |
2006年 | 1615篇 |
2005年 | 1545篇 |
2004年 | 1399篇 |
2003年 | 1249篇 |
2002年 | 1078篇 |
2001年 | 453篇 |
2000年 | 434篇 |
1999年 | 362篇 |
1998年 | 195篇 |
1997年 | 136篇 |
1996年 | 99篇 |
1995年 | 116篇 |
1994年 | 101篇 |
1993年 | 84篇 |
1992年 | 178篇 |
1991年 | 144篇 |
1990年 | 162篇 |
1989年 | 142篇 |
1988年 | 130篇 |
1987年 | 80篇 |
1986年 | 101篇 |
1985年 | 72篇 |
1984年 | 52篇 |
1983年 | 54篇 |
1979年 | 63篇 |
1974年 | 42篇 |
1973年 | 45篇 |
1970年 | 59篇 |
1969年 | 73篇 |
1968年 | 55篇 |
1967年 | 56篇 |
1966年 | 48篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Adilson Cunha Ferreira Edward Araujo Júnior Wellington P. Martins João Francisco Jordão Antônio Hélio Oliani Simon E. Meagher 《The journal of maternal-fetal & neonatal medicine》2015,28(14):1706-1710
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality. 相似文献
2.
3.
Objective
To explore from a gender perspective the association with subjective health of the interaction between education and household arrangements within the framework of social determinants of health placed at the micro and mezzo levels.Methods
The data comes from the Spanish sample of the European Union Statistics on Income and Living Conditions for 2014. Independent logistic regression models for men and women were run to analyze the association with subjective health of the interaction between education and household arrangements. An additive model was run to assess possible advantages over the interaction approach.Results
The interaction models show a lower or even no significant effect on health of household arrangements usually negatively associated with health among individuals with high education, displaying specific patterns according to sex.Conclusions
Health profiles of women and men are more precisely drawn if both social determinants of health are combined. Among the women, the important role was confirmed of both social determinants of health in understanding their health inequalities. Among the men, mainly those with low educational achievement, the interaction revealed that the household was a more meaningful social determinant of health. This could enable the definition of more efficient public policies to reduce health and gender inequalities. 相似文献4.
Marcondes C Fran?a Maria E Calcagnotto Jaderson C da Costa Iscia Lopes-Cendes 《Movement disorders》2006,21(7):1051-1053
Spinocerebellar ataxia (SCA) types 2 and 3 are autosomal-dominant neurodegenerative disorders caused by mutations in two different genes. We identified mutations for SCA2 and SCA3 segregating simultaneously in a single Brazilian family. The index patient had SCA2, whereas her two second-degree cousins had SCA3. Disease was more rapidly progressive in the SCA2 patient, who presented severe brainstem and pancerebellar atrophy, as opposed to the two SCA3 patients, who had only mild cerebellar vermian atrophy. In such situations, molecular confirmation of all patients may avoid misdiagnosis of SCA subtypes and eventual errors in predictive testing of unaffected family members. 相似文献
5.
6.
Mariela Dutra Gontijo Moura Soraya de Mattos Camargo Grossmann Linaena Méricy da Silva Fonseca Maria Inês Barreiros Senna Ricardo Alves Mesquita 《Journal of oral pathology & medicine》2006,35(6):321-326
BACKGROUND: Oral hairy leukoplakia (OHL) may be an indicator of the progression of Human Immunodeficiency Virus (HIV)-induced immuno-depression, and the evaluation of risk factors leading to OHL is important in the management of these HIV-infected patients. However, there are few studies that analyze risk factors leading to OHL in the Brazilian population. The aim of this case-control study is to present data about prevalence rates and risk factors leading to OHL in a sample of HIV-infected adults in Brazil. METHODS: This case-control study included 111 HIV-infected patients treated at a clinic for sexually transmitted diseases and HIV. In the initial examinations with dentists, variables were collected from all patients. Diagnosis of OHL was performed in accordance with the International Classification System and cytological features. The Fisher and the chi-squared tests were used for statistical analysis. The proportional prevalence and odds ratio were estimated. RESULTS: Outcome presented a positive, statistically significant association among the presence of OHL and viral load of 3000 copies/mul or greater (P = 0.0001; odds ratio (OR) = 5.8), presence of oral candidiasis (P = 0.0000; OR = 11.1), previous use of fluconazole (P = 0.0000; OR = 24.6), and use of systemic acyclovir (P = 0.032; OR = 4.3). Antiretroviral medication presented a negative, statistically significant association with the presence of OHL (P = 0.002; OR = 8.4). CONCLUSIONS: Prevalence of OHL was 28.8%. Viral load, oral candidiasis, previous use of fluconazole, and systemic acyclovir were determined to be risk factors for OHL. Antiretroviral medication proved to be protective against the development of OHL. 相似文献
7.
8.
9.
10.