全文获取类型
| 收费全文 | 535621篇 |
| 免费 | 36032篇 |
| 国内免费 | 635篇 |
专业分类
| 耳鼻咽喉 | 7102篇 |
| 儿科学 | 17451篇 |
| 妇产科学 | 14093篇 |
| 基础医学 | 87624篇 |
| 口腔科学 | 14875篇 |
| 临床医学 | 46650篇 |
| 内科学 | 98134篇 |
| 皮肤病学 | 12535篇 |
| 神经病学 | 38308篇 |
| 特种医学 | 19192篇 |
| 外国民族医学 | 66篇 |
| 外科学 | 80392篇 |
| 综合类 | 8966篇 |
| 一般理论 | 162篇 |
| 预防医学 | 41443篇 |
| 眼科学 | 12436篇 |
| 药学 | 42086篇 |
| 中国医学 | 1034篇 |
| 肿瘤学 | 29739篇 |
出版年
| 2018年 | 5423篇 |
| 2016年 | 4381篇 |
| 2015年 | 4900篇 |
| 2014年 | 6608篇 |
| 2013年 | 10383篇 |
| 2012年 | 13998篇 |
| 2011年 | 15456篇 |
| 2010年 | 9019篇 |
| 2009年 | 8426篇 |
| 2008年 | 14786篇 |
| 2007年 | 15844篇 |
| 2006年 | 16087篇 |
| 2005年 | 15509篇 |
| 2004年 | 15072篇 |
| 2003年 | 14337篇 |
| 2002年 | 14146篇 |
| 2001年 | 24613篇 |
| 2000年 | 25653篇 |
| 1999年 | 21097篇 |
| 1998年 | 5710篇 |
| 1997年 | 4918篇 |
| 1996年 | 5262篇 |
| 1995年 | 4857篇 |
| 1994年 | 4495篇 |
| 1992年 | 16137篇 |
| 1991年 | 16710篇 |
| 1990年 | 16779篇 |
| 1989年 | 16175篇 |
| 1988年 | 14903篇 |
| 1987年 | 14735篇 |
| 1986年 | 13861篇 |
| 1985年 | 13278篇 |
| 1984年 | 9878篇 |
| 1983年 | 8457篇 |
| 1982年 | 4721篇 |
| 1981年 | 4374篇 |
| 1979年 | 9650篇 |
| 1978年 | 7037篇 |
| 1977年 | 5911篇 |
| 1976年 | 5728篇 |
| 1975年 | 6537篇 |
| 1974年 | 7791篇 |
| 1973年 | 7316篇 |
| 1972年 | 7139篇 |
| 1971年 | 6838篇 |
| 1970年 | 6295篇 |
| 1969年 | 6026篇 |
| 1968年 | 5692篇 |
| 1967年 | 5133篇 |
| 1966年 | 4565篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
91.
Pulina N. A. Kuznetsov A. S. Krasnova A. I. Novikova V. V. 《Pharmaceutical Chemistry Journal》2019,53(3):220-224
Pharmaceutical Chemistry Journal - N-Substituted 4-aryl-2-hydroxy-4-oxobut-2-enoic acid hydrazides and their complexes with Ni(II), Mn(II), Co(II), Cu(II), and Zn(II) were prepared. Their... 相似文献
92.
93.
94.
Letter: faecal volatile organic metabolites,promising biomarkers in inflammatory bowel disease and Letter: faecal volatile organic metabolites as novel diagnostic biomarkers in inflammatory bowel disease. Authors’ reply 
下载免费PDF全文
下载免费PDF全文 I. Ahmed R. Greenwood B. Costello N. Ratcliffe C. Probert 《Alimentary pharmacology & therapeutics》2016,43(11):1241-1242
95.
96.
97.
J. Rodríguez-Carrio A. Martínez-Zapico I. Cabezas-Rodríguez L. Benavente Á.I. Pérez-Álvarez P. López J.B. Cannata-Andía M. Naves-Díaz A. Suárez 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(2):135-143
Background and aims
Since accelerated atherosclerosis has been reported in systemic lupus erythematosus (SLE), predictive biomarkers of cardiovascular disease (CVD) are needed. Among non-traditional risk factors, bone mineral density (BMD) has been related to CVD. However, its role in SLE remains controversial. This study aims to analyze the associations of subclinical atherosclerosis with traditional and non-traditional CV risk factors.Methods and results
In a cross-sectional study, atherosclerosis burden was compared between 112 female SLE patients and 31 controls. Plaque number and carotid intima-media wall thickness (cIMT) were assessed by ultrasonography. In a retrospective study, BMD determinations obtained 5-years before the ultrasonography assessment were analyzed in a subgroup of 62 patients. Plaque frequency was increased in SLE, even in patients without CV events or carotid wall thickening. cIMT was increased in patients with CVD, positively correlated with body mass index (BMI). Interestingly, a paradoxical effect of BMI on carotid parameters was observed. Whereas underweight patients (BMI < 20) showed increased prevalence of carotid plaques with low cIMT, those with BMI > 30 showed higher cIMT and plaque burden. Overweight patients (25 < BMI<30) exhibited both elevated cIMT and plaque number. BMI was an independent predictor of BMD. In our retrospective study, patients with either clinical or subclinical CVD exhibited lower BMD levels than their CV-free counterparts. A low lumbar spine BMD independently predicted CVD development after adjusting for confounders.Conclusion
SLE was associated with a higher subclinical atherosclerosis burden, a bimodal effect being observed for BMI. Decreased BMD can be a CV risk biomarker in SLE. 相似文献98.
A. Ríos A.I. López-Navas M.A. Ayala G. Garrido M.J. Sebastián J. Carrillo Á. Sánchez J. Flores-Medina J.J. Ruiz-Manzanera A.M. Hernández P. Ramírez P. Parrilla 《Transplantation proceedings》2019,51(2):258-260
The Latin American population has a double way of immigration, one toward the United States by proximity and another toward Spain by sociocultural affinity. This population increase is affecting organ donation and transplantation in receiving countries.
Objective
To analyze the brain death (BD) concept knowledge in the Dominican Republic immigrant population in Florida (United States) and Spain.Method
Population under study: Population born in the Dominican Republic, resident in Florida (United States) and in Spain. Inclusion criteria: Population older than 15 years stratified by age and sex. Assessment instrument: Donation attitude questionnaire PCID-DTO-Ríos. Fieldwork: Random selection based on stratification. Immigration support association collaboration in Florida and Spain was needed to locate potential respondents. Completion was anonymous and self-administered, with verbal consent.Results
A total of 123 respondents, 57 residents in Spain and 66 in Florida, have been included in the study. The 27% (n = 33) of the respondents knowledgeable of the BD concept consider it the death of an individual. Of the remainder, 52% (n = 64) do not know about it, and the remaining 21% (n = 26) believe it does not mean the death of a patient. No differences were observed regarding migration countries (P > .05). There was no association of the BD concept with other psychosocial factors analyzed or with the attitude toward organ donation.Conclusions
Knowledge of the BD concept among the Dominican immigrant population is similar in Spain and Florida, and, unlike most studies, there is no objective association with the attitude toward organ donation. 相似文献99.
Darren R. Feldman MD Yasser Ged MBBS Chung-Han Lee PhD Andrea Knezevic MS Ana M. Molina MD Ying-Bei Chen PhD Joshua Chaim DO Devyn T. Coskey MS Samuel Murray MS Satish K. Tickoo MD Victor E. Reuter MD Sujata Patil PhD Han Xiao MD Jahan Aghalar MD Arlyn J. Apollo MD Maria I. Carlo MD Robert J. Motzer MD Martin H. Voss MD 《Cancer》2020,126(24):5247-5255
100.
James I. Geller MD Joseph G. Pressey MD Malcolm A. Smith MD Rachel A. Kudgus PhD Mariana Cajaiba MD Joel M. Reid PhD David Hall PhD Donald A. Barkauskas PhD Stephen D. Voss MD Steve Y. Cho MD Stacey L. Berg MD Jeffrey S. Dome MD PhD Elizabeth Fox MD Brenda J. Weigel MD 《Cancer》2020,126(24):5303-5310