全文获取类型
收费全文 | 59133篇 |
免费 | 5664篇 |
国内免费 | 2879篇 |
专业分类
耳鼻咽喉 | 496篇 |
儿科学 | 1283篇 |
妇产科学 | 823篇 |
基础医学 | 7213篇 |
口腔科学 | 1362篇 |
临床医学 | 7072篇 |
内科学 | 9208篇 |
皮肤病学 | 978篇 |
神经病学 | 3934篇 |
特种医学 | 2002篇 |
外国民族医学 | 9篇 |
外科学 | 5926篇 |
综合类 | 8421篇 |
现状与发展 | 6篇 |
一般理论 | 12篇 |
预防医学 | 4651篇 |
眼科学 | 1384篇 |
药学 | 6351篇 |
40篇 | |
中国医学 | 2256篇 |
肿瘤学 | 4249篇 |
出版年
2023年 | 439篇 |
2022年 | 976篇 |
2021年 | 1574篇 |
2020年 | 1254篇 |
2019年 | 1216篇 |
2018年 | 1510篇 |
2017年 | 1416篇 |
2016年 | 1310篇 |
2015年 | 1868篇 |
2014年 | 2471篇 |
2013年 | 2658篇 |
2012年 | 3761篇 |
2011年 | 3952篇 |
2010年 | 2801篇 |
2009年 | 2374篇 |
2008年 | 3037篇 |
2007年 | 3175篇 |
2006年 | 2970篇 |
2005年 | 2465篇 |
2004年 | 2041篇 |
2003年 | 1950篇 |
2002年 | 1586篇 |
2001年 | 3032篇 |
2000年 | 2761篇 |
1999年 | 2247篇 |
1998年 | 915篇 |
1997年 | 693篇 |
1996年 | 478篇 |
1995年 | 406篇 |
1994年 | 361篇 |
1993年 | 285篇 |
1992年 | 1076篇 |
1991年 | 933篇 |
1990年 | 832篇 |
1989年 | 925篇 |
1988年 | 822篇 |
1987年 | 765篇 |
1986年 | 709篇 |
1985年 | 629篇 |
1984年 | 393篇 |
1983年 | 324篇 |
1982年 | 188篇 |
1981年 | 153篇 |
1980年 | 124篇 |
1979年 | 209篇 |
1974年 | 88篇 |
1973年 | 101篇 |
1972年 | 93篇 |
1971年 | 96篇 |
1970年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
1.
2.
Kuo-yi Jade Chang MHealthEc MHM BSc Lisa Lorraine Dillon MSpecEd BPsych Lil Deverell COMS PhD MEd GradDipO&M BEd Mei Ying Boon PhD BOptom FAAO Lisa Keay PhD MPH BOptom 《Clinical & experimental optometry》2020,103(4):434-448
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual. 相似文献
3.
贺雪梅 《临床超声医学杂志》2019,21(10)
借助口服超声助显剂,胃壁及其病变得以清晰显示。本文就经腹超声诊断胃常见疾病和胃排空功能评估方面的一些体会与大家分享,希望经腹胃超声这种无创、实时的检查方式能更普及,使更多患者受益。 相似文献
4.
We report a Chinese family with members affected by epidermolytic ichthyosis (EI), caused by KRT gene mutations. The proband was a 14‐year‐old boy who had simultaneous appearance of nephroblastoma and epidermolytic ichthyosis (EI). Both the patient and his mother exhibited the specific clinical and pathological manifestations of EI. We analysed all exons and flanking sequences of the KRT1 and KRT10 genes using PCR, and found that the proband and his mother had a G>C transition at nucleotide position 1432 in exon 7 of KRT1, resulting in an amino acid substitution of glutamate (GAA) to glutamine (CAA) at codon 478 (E478Q). The KRT10 gene had no mutations. 相似文献
5.
L.‐Q. Zheng X.‐C. Han Y. Huang H.‐W. Li X.‐D. Niu J. Li 《Clinical and experimental dermatology》2015,40(3):293-297
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis. 相似文献
6.
7.
8.
9.
F. Giovanardi F. Nudo Q. Lai M. Garofalo A. Consolo E. Choppin De Janvry G.A. Arroyo Murillo P. Ursi D. Stabile F. Melandro P.B. Berloco R. Pretagostini L. Poli 《Transplantation proceedings》2019,51(1):128-131
Background
Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.Methods
During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.Results
No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.Conclusions
The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach. 相似文献10.