全文获取类型
收费全文 | 1077篇 |
免费 | 82篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 83篇 |
妇产科学 | 71篇 |
基础医学 | 97篇 |
口腔科学 | 57篇 |
临床医学 | 98篇 |
内科学 | 203篇 |
皮肤病学 | 16篇 |
神经病学 | 68篇 |
特种医学 | 9篇 |
外科学 | 114篇 |
综合类 | 2篇 |
预防医学 | 132篇 |
眼科学 | 8篇 |
药学 | 82篇 |
中国医学 | 4篇 |
肿瘤学 | 111篇 |
出版年
2024年 | 2篇 |
2023年 | 7篇 |
2022年 | 22篇 |
2021年 | 47篇 |
2020年 | 31篇 |
2019年 | 31篇 |
2018年 | 36篇 |
2017年 | 37篇 |
2016年 | 33篇 |
2015年 | 42篇 |
2014年 | 49篇 |
2013年 | 67篇 |
2012年 | 113篇 |
2011年 | 109篇 |
2010年 | 52篇 |
2009年 | 47篇 |
2008年 | 71篇 |
2007年 | 56篇 |
2006年 | 63篇 |
2005年 | 46篇 |
2004年 | 57篇 |
2003年 | 39篇 |
2002年 | 31篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1973年 | 4篇 |
1970年 | 3篇 |
1967年 | 2篇 |
1966年 | 1篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1962年 | 2篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1944年 | 1篇 |
1917年 | 1篇 |
排序方式: 共有1166条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Andressa A.F.L. Maciel Reinaldo B. Ori Manuel B. Braga-Neto Andra B. Braga Eunice B. Carvalho Herene B.M. Lucena Gerly A.C. Brito Richard L. Guerrant Aldo A.M. Lima 《Toxicon》2007,50(8):1027-1040
Vitamin A (retinol), a fat-soluble vitamin, is an essential nutrient for the normal functioning of the visual system, epithelial cell integrity and growth, immunity, and reproduction. Our group has investigated the effect of high doses of oral vitamin A on early childhood diarrhea in our prospective community-based studies from Northeast Brazil and found a beneficial role in reducing the mean duration but not incidence of diarrheal episodes. In this study, we explored the role of retinol supplementation in intestinal cell lines following Clostridium difficile toxin A (TxA) challenge. C. difficile is the most common anaerobic pathogen borne with antibiotic-borne diarrhea and pseudomembranous colitis. Since retinol is critical for the integrity of tight junctions and to modulate the cell cycle, we have focused on changes in transepithelial electrical resistance (TEER) in Caco-2, a more differentiated intestinal cell line, and on models of cell proliferation, migration and viability in IEC-6 cells, an undifferentiated crypt cell line, following TxA injury. In this model, retinol therapy reduced apoptosis, improved cell migration and proliferation, and prevented the reduction in TEER, following C. difficile TxA challenge in a glutamine-free medium. These results suggest the role of retinol in protecting intestinal epithelial barrier function from C. difficile TxA enterotoxic damage. 相似文献
5.
Judith P. Rooks Norman L. Weatherby Eunice K. M. Ernst 《Journal of Midwifery & Women's Health》1992,37(5):301-313
Part II of a three-part report of the National Birth Center Study describes care provided to 11,814 women and their newborns during and after labor and delivery until they were transferred or discharged from the birth centers. There were few low birth weight or preterm or postterm births, but more macrosomic babies than among all U.S. births during the same time period. Certified nurse-midwives provided most of the intrapartum care, which is described in the context of medically recommended standards and data that describe care provided to low-risk women giving birth in U.S. hospitals. Birth center care deviated from typical hospital care in several ways. Birth center clients were much less likely to receive central nervous system depressants, anesthesia, continuous electronic fetal monitoring, induction and/or augmentation of labor, intravenous infusions, amniotomies, or episiotomies, and they had relatively few vaginal examinations. They were more likely to eat solid food during labor and to take showers and/or baths Nulliparity was strongly associated with longer first stage labors and longer labor was associated with more frequent use of many kinds of interventions. Infant birth weight, mother's position during delivery, and forceps- or vacuum-assisted deliveries are examined in relation to episiotomies and lacerations and tears. 相似文献
6.
7.
8.
Liquid crystals are a promising candidate for development of active plasmonics due to their large birefringence, low driving threshold, and versatile driving methods. We review recent progress on the interdisciplinary research field of liquid crystal based plasmonics. The research scope of this field is to build the next generation of reconfigurable plasmonic devices by combining liquid crystals with plasmonic nanostructures. Various active plasmonic devices, such as switches, modulators, color filters, absorbers, have been demonstrated. This review is structured to cover active plasmonic devices from two aspects: functionalities and driven methods. We hope this review would provide basic knowledge for a new researcher to get familiar with the field, and serve as a reference for experienced researchers to keep up the current research trends. 相似文献
9.
10.
Effect of sealing infected dentin with glass ionomer cement on the abundance and localization of MMP‐2, MMP‐8, and MMP‐9 in young permanent molars in vivo
下载免费PDF全文
![点击此处可从《International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Eunice Kuhn Alessandra Reis Eduardo Bauml Campagnoli Ana Cláudia Rodrigues Chibinski Marcela Rocha de Oliveira Carrilho Denise Stadler Wambier 《International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children》2016,26(2):125-133