全文获取类型
收费全文 | 2841篇 |
免费 | 189篇 |
国内免费 | 39篇 |
学科分类
医药卫生 | 3069篇 |
出版年
2023年 | 15篇 |
2022年 | 30篇 |
2021年 | 59篇 |
2020年 | 58篇 |
2019年 | 64篇 |
2018年 | 79篇 |
2017年 | 53篇 |
2016年 | 56篇 |
2015年 | 95篇 |
2014年 | 122篇 |
2013年 | 137篇 |
2012年 | 202篇 |
2011年 | 185篇 |
2010年 | 150篇 |
2009年 | 123篇 |
2008年 | 138篇 |
2007年 | 112篇 |
2006年 | 104篇 |
2005年 | 107篇 |
2004年 | 80篇 |
2003年 | 91篇 |
2002年 | 76篇 |
2001年 | 60篇 |
2000年 | 36篇 |
1999年 | 56篇 |
1998年 | 92篇 |
1997年 | 82篇 |
1996年 | 62篇 |
1995年 | 56篇 |
1994年 | 42篇 |
1993年 | 48篇 |
1992年 | 17篇 |
1991年 | 33篇 |
1990年 | 20篇 |
1989年 | 46篇 |
1988年 | 39篇 |
1987年 | 31篇 |
1986年 | 26篇 |
1985年 | 22篇 |
1984年 | 12篇 |
1983年 | 17篇 |
1982年 | 17篇 |
1981年 | 14篇 |
1980年 | 15篇 |
1979年 | 7篇 |
1978年 | 14篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1975年 | 9篇 |
1969年 | 9篇 |
排序方式: 共有3069条查询结果,搜索用时 15 毫秒
71.
72.
73.
César Augusto Amorim Jéssica Pronestino Moreira Luisa Rial Antonio José Carneiro Homero Soares Foga?a Celeste Elia Ronir Raggio Luiz Heitor Siffert Pereira de Souza 《World journal of gastroenterology : WJG》2014,20(17):5036-5044
AIM:To investigate the geographic distributions and time trends of gastric cancer(GC)incidence and mortality in Brazil.METHODS:An ecological study of the DATASUS registry was conducted by identifying hospitalizations for GC between January 2005 and December 2010.The data included information on the gender,age,and town of residence at the time of hospital admission and death.RESULTS:The GC rates,adjusted according to available hospital beds,decreased from 13.8 per 100000in 2005 to 12.7 per 100000 in 2010.The GC rates decreased more among the younger age groups,in which the male-to-female difference also decreased in comparison to the older age groups.Although the lethality rates tended to increase with age,young patients were proportionally more affected.The spatial GC distribution showed that the rates were higher in the south and southeast.However,while the rates decreased in the central-west and south,they increased in the northern regions.A geographic analysis showed higher rates of GC in more urbanized areas,with a coast-toinland gradient.Geographically,GC lethality overlapped greatly with the hospital admission rates.CONCLUSION:The results of this study support the hypothesis of a critical role for environmental factors in GC pathogenesis.The declining rates in young patients,particularly males,suggest a relatively recent decrease in the exposure to risk factors associated with GC.The spatial distribution of GC indicates an ongoing dynamic change within the Brazilian environment. 相似文献
74.
75.
76.
77.
Influence of a collagen membrane positioned subjacent the sinus mucosa following the elevation of the maxillary sinus. A histomorphometric study in rabbits 下载免费PDF全文
78.
Frederico Figueiredo Amancio Maira Alves Pereira Felipe Campos de Melo Iani Lorena D'anuncia??o Jorge Luís Carvalho de Almeida Janer Aparecida Silveira Soares Marcela Lencine Ferraz Thiago Cardoso Vale José Roberto Lambertucci Mariangela Carneiro 《Revista do Instituto de Medicina Tropical de S?o Paulo》2014,56(3):267-270
Dengue is currently a major public-health problem. Dengue virus (DENV) is
classified into four distinct serotypes, DENV 1-4. After 28 years of absence, DENV-4
was again detected in Brazil in 2010 in Roraima State, and one year later, the virus
was identified in the northern Brazilian states of Amazonas and Pará, followed by Rio
de Janeiro and São Paulo. In Minas Gerais, the first confirmed case of DENV-4
occurred in the municipality of Frutal in 2011 and has now been isolated from a
growing number of patients. Although DENV-2 is associated with the highest risk of
severe forms of the disease and death due to the infection, DENV-4 has also been
associated with severe forms of the disease and an increasing risk of hemorrhagic
manifestations. Herein, the first fatal case of confirmed DENV-4 in Brazil is
reported. The patient was an 11-year-old girl from the municipality of Montes Claros
in northern Minas Gerais State, Brazil. She had idiopathic thrombocytopenic purpura
as a comorbid condition and presented with a fulminant course of infection, leading
to death due to hemorrhagic complications. Diagnosis was confirmed by detection of
Dengue-specific antibodies using IgM capture enzyme-linked immunosorbent assay and
semi-nested RT-PCR. Primary care physicians and other health-care
providers should bear in mind that DENV-4 can also result in severe forms of the
disease and lead to hemorrhagic complications and death, mainly when dengue infection
is associated with coexisting conditions. 相似文献
79.
C.R.A. de Lima T.B. Mirandolli L.C. Carneiro C. Tusset C.M. Romer H.F. Andreolla L.F. Baethgen A.C. Pasqualotto 《Transplant infectious disease》2014,16(1):165-169
Respiratory viral infections are frequent causes of morbidity in transplant patients. We screened symptomatic adult transplant recipients for respiratory viruses in a cohort of patients attending a referral medical center in Brazil. The duration of viral shedding and the prevalence of viral codetections were also determined. During a 1‐year period (2011–2012), swabs were obtained from 50 patients. An in‐house polymerase chain reaction panel designed to detect 10 viruses was used. Viruses were identified in 19 (38%) patients, particularly parainfluenza III (32%) and the respiratory syncytial virus (20%); multiple viruses were identified in 26% of patients. Prolonged viral shedding was observed with 60% of individuals excreting viruses for >10 days. The clinical and epidemiologic relevance of prolonged viral shedding remains to be determined. 相似文献
80.