全文获取类型
收费全文 | 24059篇 |
免费 | 1400篇 |
国内免费 | 109篇 |
专业分类
耳鼻咽喉 | 383篇 |
儿科学 | 504篇 |
妇产科学 | 512篇 |
基础医学 | 3405篇 |
口腔科学 | 1986篇 |
临床医学 | 1666篇 |
内科学 | 5700篇 |
皮肤病学 | 470篇 |
神经病学 | 1831篇 |
特种医学 | 472篇 |
外科学 | 3177篇 |
综合类 | 99篇 |
一般理论 | 9篇 |
预防医学 | 2189篇 |
眼科学 | 510篇 |
药学 | 1506篇 |
中国医学 | 205篇 |
肿瘤学 | 944篇 |
出版年
2023年 | 218篇 |
2022年 | 426篇 |
2021年 | 982篇 |
2020年 | 559篇 |
2019年 | 751篇 |
2018年 | 938篇 |
2017年 | 622篇 |
2016年 | 665篇 |
2015年 | 839篇 |
2014年 | 1111篇 |
2013年 | 1383篇 |
2012年 | 2023篇 |
2011年 | 2287篇 |
2010年 | 1106篇 |
2009年 | 939篇 |
2008年 | 1550篇 |
2007年 | 1561篇 |
2006年 | 1387篇 |
2005年 | 1193篇 |
2004年 | 1002篇 |
2003年 | 874篇 |
2002年 | 796篇 |
2001年 | 279篇 |
2000年 | 282篇 |
1999年 | 225篇 |
1998年 | 119篇 |
1997年 | 93篇 |
1996年 | 62篇 |
1995年 | 63篇 |
1994年 | 73篇 |
1993年 | 50篇 |
1992年 | 119篇 |
1991年 | 78篇 |
1990年 | 88篇 |
1989年 | 84篇 |
1988年 | 60篇 |
1987年 | 53篇 |
1986年 | 39篇 |
1985年 | 51篇 |
1984年 | 41篇 |
1983年 | 27篇 |
1982年 | 27篇 |
1980年 | 31篇 |
1979年 | 25篇 |
1978年 | 31篇 |
1975年 | 23篇 |
1974年 | 24篇 |
1973年 | 28篇 |
1971年 | 32篇 |
1969年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 708 毫秒
1.
2.
3.
4.
5.
6.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98
7.
8.
9.
J. Oliveira-Santos R. Santos C. Moreira S. Abreu L. Lopes C. Agostinis-Sobrinho G. Stratton J. Mota 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(8):783-792
Background and aimsThe long-term relations between excessive adiposity in early childhood and unfavourable cardiometabolic profiles in later ages are not yet completely understood. We aimed to assess the associations between birth weight (BW) and BMI from 6 months to 6 years of age, with biomarkers indicative of low-grade inflammation, insulin resistance and lipid profiles in adolescence.Methods and resultsRetrospective school-based study with 415 Portuguese adolescents (220 girls), mean age of 14.08 ± 1.6 years old. Anthropometric data from birth to 6 years old was extracted from individual child health book records. Actual weight and height were measured and BMI calculated. Participants were classified at each time point as normal weight or overweight according to WHO reference values. Biomarkers were obtained from venous blood samples. Linear regressions were used to explore the associations between the biomarkers and early life anthropometric indicators. From 2 years onwards, BMI associated positively with the inflammatory score and HOMA-IR in adolescence. Children who were overweight/obese from 2 to 6 years of age presented significantly higher inflammatory score and HOMA-IR later in adolescence. TC/HDL ratio was also positively associated with BMI from the age of 5 years onwards. The associations between BMI and cardiometabolic outcomes remained positive in adolescence, with overweight adolescents presenting a higher inflammatory score, HOMA-IR and TC/HDL than normal weight adolescents.ConclusionA high BMI from an early age was consistently associated with worse inflammatory and lipid profiles and insulin resistance in adolescence. No associations were found between BW and the same studied outcomes. 相似文献
10.
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