全文获取类型
收费全文 | 3498381篇 |
免费 | 247418篇 |
国内免费 | 8825篇 |
专业分类
耳鼻咽喉 | 47988篇 |
儿科学 | 115932篇 |
妇产科学 | 96118篇 |
基础医学 | 492125篇 |
口腔科学 | 96022篇 |
临床医学 | 317034篇 |
内科学 | 688575篇 |
皮肤病学 | 81872篇 |
神经病学 | 285644篇 |
特种医学 | 133985篇 |
外国民族医学 | 1320篇 |
外科学 | 522736篇 |
综合类 | 70376篇 |
现状与发展 | 6篇 |
一般理论 | 1258篇 |
预防医学 | 270247篇 |
眼科学 | 78447篇 |
药学 | 257176篇 |
9篇 | |
中国医学 | 7212篇 |
肿瘤学 | 190542篇 |
出版年
2019年 | 28357篇 |
2018年 | 41324篇 |
2017年 | 31148篇 |
2016年 | 35321篇 |
2015年 | 39797篇 |
2014年 | 53719篇 |
2013年 | 81352篇 |
2012年 | 111650篇 |
2011年 | 117763篇 |
2010年 | 69736篇 |
2009年 | 65548篇 |
2008年 | 109525篇 |
2007年 | 116736篇 |
2006年 | 117298篇 |
2005年 | 113207篇 |
2004年 | 109141篇 |
2003年 | 105098篇 |
2002年 | 101487篇 |
2001年 | 162831篇 |
2000年 | 167343篇 |
1999年 | 141658篇 |
1998年 | 40600篇 |
1997年 | 36136篇 |
1996年 | 36304篇 |
1995年 | 34989篇 |
1994年 | 32424篇 |
1993年 | 30368篇 |
1992年 | 111129篇 |
1991年 | 107327篇 |
1990年 | 104173篇 |
1989年 | 100567篇 |
1988年 | 92366篇 |
1987年 | 90583篇 |
1986年 | 84719篇 |
1985年 | 81013篇 |
1984年 | 60625篇 |
1983年 | 51331篇 |
1982年 | 30249篇 |
1981年 | 27243篇 |
1979年 | 53870篇 |
1978年 | 37883篇 |
1977年 | 32327篇 |
1976年 | 29923篇 |
1975年 | 32079篇 |
1974年 | 37826篇 |
1973年 | 36071篇 |
1972年 | 33720篇 |
1971年 | 31074篇 |
1970年 | 28987篇 |
1969年 | 27377篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Ciléin Kearns Nethmi Kearns Anna M. Paisley 《Journal of visual communication in medicine》2020,43(2):76-83
AbstractSupporting patients in making informed healthcare decisions is a cornerstone of ethical medical practice. Surgeons frequently draw for and show images to patients when consenting them for operations but the value of this practice in informed decision-making is unclear. An audit was conducted in a General Surgery Department. 244 patients completed questionnaires on the value of visual materials when giving consent for surgery. The complexity of the operations was classified into “simple”, “moderate” or “complex”. 100% of patients felt they had given informed consent to surgery. 62% of patients received at least one form of visual material during the consenting process. All patients who received a drawing, and 99% of those provided with other images, valued these resources. Visual materials were considered more useful to patients when giving consent for moderate or complex operations than simple ones. Approximately one third of patients who did not receive visual materials would have appreciated these when making an informed decision. This research highlights the value of surgeons drawing for, and providing other visual resources to, their patients as part of the consent process. There is a role for further research and training materials in drawing skills for surgeons. 相似文献
74.
The human visual system is amenable to a number of adaptive processes; one such process, or collection of processes, is the adaptation to blur. Blur adaptation can be observed as an improvement in vision under degraded conditions, and these changes occur relatively rapidly following exposure to blur. The potential important future directions of this research area and the clinical implications of blur adaptation are discussed. 相似文献
75.
76.
Ruiz-Úcar Elena Acín-Gándara Débora Medina-García Manuel Ronda Diego Cruzado Pereira-Pérez Fernando 《Obesity surgery》2022,32(2):569-570
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The... 相似文献
77.
Danielle E Whittier Elizabeth J Samelson Marian T Hannan Lauren A Burt David A Hanley Emmanuel Biver Pawel Szulc Elisabeth Sornay-Rendu Blandine Merle Roland Chapurlat Eric Lespessailles Andy Kin On Wong David Goltzman Sundeep Khosla Serge Ferrari Mary L Bouxsein Douglas P Kiel Steven K Boyd 《Journal of bone and mineral research》2022,37(3):428-439
Prevalence of osteoporosis is more than 50% in older adults, yet current clinical methods for diagnosis that rely on areal bone mineral density (aBMD) fail to detect most individuals who have a fragility fracture. Bone fragility can manifest in different forms, and a “one-size-fits-all” approach to diagnosis and management of osteoporosis may not be suitable. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides additive information by capturing information about volumetric density and microarchitecture, but interpretation is challenging because of the complex interactions between the numerous properties measured. In this study, we propose that there are common combinations of bone properties, referred to as phenotypes, that are predisposed to different levels of fracture risk. Using HR-pQCT data from a multinational cohort (n = 5873, 71% female) between 40 and 96 years of age, we employed fuzzy c-means clustering, an unsupervised machine-learning method, to identify phenotypes of bone microarchitecture. Three clusters were identified, and using partial correlation analysis of HR-pQCT parameters, we characterized the clusters as low density, low volume, and healthy bone phenotypes. Most males were associated with the healthy bone phenotype, whereas females were more often associated with the low volume or low density bone phenotypes. Each phenotype had a significantly different cumulative hazard of major osteoporotic fracture (MOF) and of any incident osteoporotic fracture (p < 0.05). After adjustment for covariates (cohort, sex, and age), the low density followed by the low volume phenotype had the highest association with MOF (hazard ratio = 2.96 and 2.35, respectively), and significant associations were maintained when additionally adjusted for femoral neck aBMD (hazard ratio = 1.69 and 1.90, respectively). Further, within each phenotype, different imaging biomarkers of fracture were identified. These findings suggest that osteoporotic fracture risk is associated with bone phenotypes that capture key features of bone deterioration that are not distinguishable by aBMD. © 2021 American Society for Bone and Mineral Research (ASBMR). 相似文献
78.
Rocha Déborah Ribeiro Nery Jaqueline Freire Furini Leonardo Negri Constantino Carlos José Leopoldo Eller Lizziane Kretli Winkelströter Nai Gisele Alborghetti Nakagaki Wilson Romero 《Lasers in medical science》2020,35(8):1703-1709
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective... 相似文献
79.
80.