全文获取类型
收费全文 | 6227篇 |
免费 | 339篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 99篇 |
儿科学 | 163篇 |
妇产科学 | 130篇 |
基础医学 | 672篇 |
口腔科学 | 952篇 |
临床医学 | 318篇 |
内科学 | 1249篇 |
皮肤病学 | 145篇 |
神经病学 | 374篇 |
特种医学 | 222篇 |
外科学 | 840篇 |
综合类 | 36篇 |
一般理论 | 2篇 |
预防医学 | 687篇 |
眼科学 | 179篇 |
药学 | 298篇 |
中国医学 | 81篇 |
肿瘤学 | 138篇 |
出版年
2023年 | 26篇 |
2022年 | 89篇 |
2021年 | 164篇 |
2020年 | 106篇 |
2019年 | 145篇 |
2018年 | 196篇 |
2017年 | 155篇 |
2016年 | 146篇 |
2015年 | 182篇 |
2014年 | 244篇 |
2013年 | 314篇 |
2012年 | 354篇 |
2011年 | 445篇 |
2010年 | 267篇 |
2009年 | 235篇 |
2008年 | 342篇 |
2007年 | 417篇 |
2006年 | 365篇 |
2005年 | 334篇 |
2004年 | 276篇 |
2003年 | 210篇 |
2002年 | 206篇 |
2001年 | 159篇 |
2000年 | 138篇 |
1999年 | 81篇 |
1998年 | 69篇 |
1997年 | 67篇 |
1996年 | 43篇 |
1995年 | 38篇 |
1994年 | 31篇 |
1993年 | 24篇 |
1992年 | 39篇 |
1991年 | 55篇 |
1990年 | 38篇 |
1989年 | 38篇 |
1988年 | 34篇 |
1987年 | 39篇 |
1986年 | 34篇 |
1985年 | 51篇 |
1984年 | 27篇 |
1983年 | 24篇 |
1981年 | 20篇 |
1980年 | 23篇 |
1979年 | 23篇 |
1977年 | 18篇 |
1975年 | 23篇 |
1970年 | 25篇 |
1969年 | 30篇 |
1968年 | 20篇 |
1967年 | 27篇 |
排序方式: 共有6585条查询结果,搜索用时 10 毫秒
971.
972.
973.
974.
Lima HN Botosso VF Oliveira DB Campos AC Leal AL Silva TS Bosso PA Moraes CT Filho CG Vieira SE Gilio AE Stewien KE Durigon EL 《Virus research》2012,163(1):82-86
Human respiratory syncytial virus (HRSV) strains were isolated from nasopharyngeal aspirates collected from 965 children between 2004 and 2005, yielding 424 positive samples.We sequenced the small hydrophobic protein (SH) gene of 117 strains and compared them with other viruses identified worldwide. Phylogenetic analysis showed a low genetic variability among the isolates but allowed us to classify the viruses into different genotypes for both groups, HRSVA and HRSVB. It is also shown that the novel BA-like genotype was well segregated from the others, indicating that the mutations are not limited to the G gene. 相似文献
975.
Tulio M. Fumian Glicélia C. Arag?o Joana D’Arc P. Mascarenhas Jane H. Kaiano Jones Anderson M. Siqueira Luana S. Soares Alexandre C. Linhares Yvone B. Gabbay 《Archives of virology》2012,157(12):2389-2392
Noroviruses, a major cause of acute gastroenteritis outbreaks worldwide, are constantly evolving. This ability is reflected in the speed and efficiency with which these viruses spread and remain in the human population. The present study reports the detection of a novel recombination event among norovirus genotypes in Brazil in 2008. A strain detected in a stool sample from a child with norovirus-associated gastroenteritis, residing in an African-descendant semi-closed community of Pará State, was characterized as a novel intergenotype recombinant, GII.7/GII.20, as determined by partial sequencing and SimPlot analysis. 相似文献
976.
977.
978.
979.
980.
Balista SR Santiago SM Corrêa Filho HR 《Cadernos de saúde pública / Ministério da Saúde, Funda??o Oswaldo Cruz, Escola Nacional de Saúde Pública》2011,27(4):759-768
This study evaluates the decentralization of workers' health surveillance to district teams in Campinas, S?o Paulo State, Brazil, from 1990 to 2006. The history and context of this process were retrieved from documents at the Municipal Health Department in order to establish evaluation criteria and define facilitating factors and obstacles in guideline implementation, as well as to measure the gap between guidelines and reality. The evaluation used qualitative techniques with stakeholders' focus groups. The results showed that decentralization was defined according to the prevailing political options and according to the principles of the Unified National Health System (SUS). Facilitating factors included the increase in technical capability and integration among the teams, and obstacles included excessively centralized planning with limited participation, insufficient resources, and lack of clarity between the services concerning roles and responsibilities. The discussion of these results with health system administrators, social actors, and participating health professionals has contributed to the analysis and organization of transformative measures in regional public practices in workers' health surveillance. 相似文献