全文获取类型
收费全文 | 11103篇 |
免费 | 751篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 179篇 |
儿科学 | 299篇 |
妇产科学 | 189篇 |
基础医学 | 1501篇 |
口腔科学 | 1116篇 |
临床医学 | 907篇 |
内科学 | 2371篇 |
皮肤病学 | 197篇 |
神经病学 | 903篇 |
特种医学 | 339篇 |
外科学 | 1332篇 |
综合类 | 76篇 |
一般理论 | 1篇 |
预防医学 | 1043篇 |
眼科学 | 160篇 |
药学 | 638篇 |
中国医学 | 72篇 |
肿瘤学 | 577篇 |
出版年
2023年 | 113篇 |
2022年 | 272篇 |
2021年 | 393篇 |
2020年 | 287篇 |
2019年 | 353篇 |
2018年 | 441篇 |
2017年 | 267篇 |
2016年 | 342篇 |
2015年 | 366篇 |
2014年 | 478篇 |
2013年 | 569篇 |
2012年 | 869篇 |
2011年 | 951篇 |
2010年 | 463篇 |
2009年 | 431篇 |
2008年 | 630篇 |
2007年 | 658篇 |
2006年 | 566篇 |
2005年 | 466篇 |
2004年 | 412篇 |
2003年 | 351篇 |
2002年 | 340篇 |
2001年 | 174篇 |
2000年 | 171篇 |
1999年 | 152篇 |
1998年 | 61篇 |
1997年 | 47篇 |
1996年 | 54篇 |
1995年 | 42篇 |
1994年 | 54篇 |
1993年 | 44篇 |
1992年 | 85篇 |
1991年 | 89篇 |
1990年 | 64篇 |
1989年 | 70篇 |
1988年 | 53篇 |
1987年 | 64篇 |
1986年 | 67篇 |
1985年 | 46篇 |
1984年 | 49篇 |
1983年 | 46篇 |
1982年 | 37篇 |
1981年 | 31篇 |
1980年 | 28篇 |
1979年 | 28篇 |
1978年 | 27篇 |
1977年 | 31篇 |
1975年 | 30篇 |
1970年 | 25篇 |
1968年 | 26篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Caio Henrique de Carvalho Assuno Júlio Csar Trabanco Raquel Fornaziero Gomes Renata Rodrigues Moreira Alessandra Giannella Samelli 《La Medicina del lavoro》2019,110(4):304
Objective:The present study evaluates a training program for fitting different hearing protection devices (HPDs) based on personal attenuation rating (PAR) before, immediately after, and six months after training.Methods:A total of 67 workers from a public university in the city of São Paulo, Brazil, were invited to participate in the measurement of PARs for foam and silicone protectors through the 3M™ E-A-Rfit Validation System. Two evaluations were performed for each protector at each sampling date: one after reading printed material (the package instructions) and another after being trained by an audiologist. The same procedures were repeated after six months. The final sample consisted of 30 individuals. ANOVA was used for statistical analysis.Results:Larger PAR values were observed after training by the audiologist, and smaller values were observed after six months. Then, after re-training, the values increased again. There were no statistically significant differences in PAR among the HPDs tested. Even after the two training sessions, 23 to 27% of the subjects did not obtain adequate PAR values.Conclusion:These findings emphasize the need for continual worker training in the correct fit of earplug HPDs and the importance of longitudinal PAR monitoring. In addition, some workers, despite the training provided, did not adapt to the HPDs used. Therefore, it is essential that other protection methods and/or other HPD types are made available to these individuals.Key words: Hearing, noise-induced hearing loss, occupational health, personal protective equipment, hearing protection devices 相似文献
3.
4.
Joseane Balan Da Silva Gleison Daion Piovezana Bossolani Camila Piva Greicy Brisa Malaquias Dias Jancarlo Gomes Ferreira Diogo Francisco Rossoni 《International journal of environmental health research》2016,26(5-6):578-588
The spatial distribution of enteroparasitosis in an indigenous village from Paraná was evaluated to identify areas of risk for these infections. A cross-sectional study (from November 2010 to June 2011) was performed using Three Faecal Test® and Kato &; Katz method and a questionnaire on housing and hygiene conditions was administered. Local geostatistical analyses were performed to determine the spatial distribution of intestinal parasitic infections. The overall prevalence of enteroparasites was 67.2?% (457/680), and the most prevalent taxa were Ascaris lumbricoides (48.8?%) and Trichuris trichiura (44.7?%). The prevalence of heavy infection by soil-transmitted helminths was 3.6?% and the families lived in houses with an average of 5.1 residents and < 2 bedrooms per household. The average number of species per individual present spatial heterogeneity with the highest values (≥0.8) in areas with high clustering of residences. The visualization of the spatial distribution of intestinal parasites in this indigenous village is an important contribution to determining health risk areas and planning decisions and services. 相似文献
5.
Marcelo Sato‐Sano Solange Pistori Teixeira Juliano Cordova Vargas Otvio Cesar Carvalho Guimares Baiocchi Milvia Maria Simes e Silva Enokihara Elimar Elias Gomes Mariana Dias Batista 《The Journal of dermatology》2019,46(7):618-621
Eosinophilic dermatosis of hematological malignancy is a paraneoplastic skin eruption associated with chronic lymphocytic leukemia and other B‐cell malignancies. It clinically resembles an insect bite reaction and it can precede the symptoms of the hematological malignancy or be related to a more aggressive course. Different treatments have been proposed, but partial response and recurrence are frequent. Herein, we describe a case of eosinophilic dermatosis associated with mantle cell lymphoma with remission after lenalidomide therapy. 相似文献
6.
7.
Raphael Mohr Robert Schierwagen Carolynne Schwarze-Zander Christoph Boesecke Jan-Christian Wasmuth Jonel Trebicka Jürgen Kurt Rockstroh 《Medicine》2015,94(50)
Liver-related death in human immunodeficiency virus (HIV)-infected individuals is about 10 times higher compared with the general population, and the prevalence of significant liver fibrosis in those with HIV approaches 15%. The present study aimed to assess risk factors for development of hepatic fibrosis in HIV patients receiving a modern combination anti-retroviral therapy (cART).This cross-sectional prospective study included 432 HIV patients, of which 68 (16%) patients were anti-hepatitis C virus (HCV) positive and 23 (5%) were HBsAg positive.Health trajectory including clinical characteristics and liver fibrosis stage assessed by transient elastography were collected at inclusion. Liver stiffness values >7.1 kPa were considered as significant fibrosis, while values >12.5 kPa were defined as severe fibrosis. Logistic regression and Cox regression uni- and multivariate analyses were performed to identify independent factors associated with liver fibrosis.Significant liver fibrosis was detected in 10% of HIV mono-infected, in 37% of HCV co-infected patients, and in 18% of hepatitis B virus co-infected patients. The presence of diabetes mellitus (odds ratio [OR] = 4.6) and FIB4 score (OR = 2.4) were independently associated with presence of significant fibrosis in the whole cohort. Similarly, diabetes mellitus (OR = 5.4), adiposity (OR = 4.6), and the FIB4 score (OR = 3.3) were independently associated with significant fibrosis in HIV mono-infected patients. Importantly, cumulative cART duration protected, whereas persistent HIV viral replication promoted the development of significant liver fibrosis along the duration of HIV infection.Our findings strongly indicate that besides known risk factors like metabolic disorders, HIV may also have a direct effect on fibrogenesis. Successful cART leading to complete suppression of HIV replication might protect from development of liver fibrosis. 相似文献
8.
9.
Thaís dos Santos Fontes Pereira Carolina Cavalieri Gomes Peter A Brennan Felipe Paiva Fonseca Ricardo Santiago Gomez 《Journal of oral pathology & medicine》2019,48(1):3-9
Fibrous dysplasia is a non‐neoplastic developmental process that affects the craniofacial bones, characterized by painless enlargement as a result of bone substitution by abnormal fibrous tissue. Postzygotic somatic activating mutations in the GNAS1 gene cause fibrous dysplasia and have been extensively investigated, as well as being helpful in the differential diagnosis of the disease. Fibrous dysplasia may involve one (monostotic) or multiple bones (polyostotic), sporadically or in association with McCune‐Albright syndrome, Jeffe‐Lichenstein syndrome, or Mazabreud syndrome. This review summarizes the current knowledge on fibrous dysplasia, emphasizing the value of integrating the understanding of its molecular pathogenesis with the clinical, radiological, and histopathological features. In addition, we address important aspects related to the differential diagnosis and patient management. 相似文献
10.