全文获取类型
收费全文 | 933篇 |
免费 | 77篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 59篇 |
儿科学 | 34篇 |
妇产科学 | 25篇 |
基础医学 | 63篇 |
口腔科学 | 16篇 |
临床医学 | 130篇 |
内科学 | 166篇 |
皮肤病学 | 22篇 |
神经病学 | 49篇 |
特种医学 | 103篇 |
外科学 | 153篇 |
综合类 | 25篇 |
预防医学 | 60篇 |
眼科学 | 12篇 |
药学 | 36篇 |
肿瘤学 | 62篇 |
出版年
2023年 | 7篇 |
2021年 | 27篇 |
2020年 | 12篇 |
2019年 | 17篇 |
2018年 | 30篇 |
2017年 | 22篇 |
2016年 | 15篇 |
2015年 | 25篇 |
2014年 | 48篇 |
2013年 | 60篇 |
2012年 | 25篇 |
2011年 | 36篇 |
2010年 | 60篇 |
2009年 | 38篇 |
2008年 | 48篇 |
2007年 | 37篇 |
2006年 | 33篇 |
2005年 | 26篇 |
2004年 | 23篇 |
2003年 | 15篇 |
2002年 | 21篇 |
2001年 | 25篇 |
2000年 | 16篇 |
1999年 | 19篇 |
1998年 | 28篇 |
1997年 | 37篇 |
1996年 | 33篇 |
1995年 | 17篇 |
1994年 | 22篇 |
1993年 | 12篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 12篇 |
1985年 | 16篇 |
1984年 | 16篇 |
1983年 | 9篇 |
1982年 | 17篇 |
1981年 | 9篇 |
1980年 | 11篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1975年 | 5篇 |
1973年 | 3篇 |
1970年 | 2篇 |
排序方式: 共有1015条查询结果,搜索用时 15 毫秒
1.
2.
3.
Background
Pulmonary dysfunction following cardiac surgery is believed to be caused, at least in part, by a lung vascular injury and/or atelectasis following cardiopulmonary bypass (CPB) perfusion and collapse of non-ventilated lungs. 相似文献4.
Carel Bron Michel Wensing Jo LM Franssen Rob AB Oostendorp 《BMC musculoskeletal disorders》2007,8(1):107
Background
Shoulder disorders are a common health problem in western societies. Several treatment protocols have been developed for the clinical management of persons with shoulder pain. However available evidence does not support any protocol as being superior over others. Systematic reviews provide some evidence that certain physical therapy interventions (i.e. supervised exercises and mobilisation) are effective in particular shoulder disorders (i.e. rotator cuff disorders, mixed shoulder disorders and adhesive capsulitis), but there is an ongoing need for high quality trials of physical therapy interventions. Usually, physical therapy consists of active exercises intended to strengthen the shoulder muscles as stabilizers of the glenohumeral joint or perform mobilisations to improve restricted mobility of the glenohumeral or adjacent joints (shoulder girdle). It is generally accepted that a-traumatic shoulder problems are the result of impingement of the subacromial structures, such as the bursa or rotator cuff tendons. Myofascial trigger points (MTrPs) in shoulder muscles may also lead to a complex of symptoms that are often seen in patients diagnosed with subacromial impingement or rotator cuff tendinopathy. Little is known about the treatment of MTrPs in patients with shoulder disorders. 相似文献5.
Endoscopic Reconstruction of Cranial Base Defects following Endonasal Skull Base Surgery. 总被引:3,自引:0,他引:3 下载免费PDF全文
The expanded endonasal approach provides access to the entire ventral skull base for resection of neoplasms involving the skull base and brain. The creation of large defects of the bone and dura endoscopically presents unique reconstructive challenges. A layered reconstruction of the dura with inlay and onlay fascial grafts covered with fat grafts is an effective technique for repair. An intranasal balloon catheter is used to provide counterpressure in the early phase of healing and a lumbar spinal drain is a useful adjunct in patients at increased risk of a cerebrospinal fluid leak. Vascularized flaps may be necessary in some patients receiving radiation therapy. Continued advances in surgical technology and the introduction of new biomaterials will facilitate the reconstruction of skull base defects following endonasal brain surgery. 相似文献
6.
TP Amadeu† AB Seabra‡ MG de Oliveira‡ AMA Costa† 《Journal of the European Academy of Dermatology and Venereology》2007,21(5):629-637
BACKGROUND: Nitric oxide (NO) plays a key role in wound repair and S-nitrosothiols like S-nitrosoglutathione (GSNO) are well known NO donors. METHODS: Animals were separated in two groups and submitted to excisional wounds on the dorsal surface at the first day. GSNO (100 microm)-containing hydrogels were topically applied on the wound bed in the GSNO group, daily, during the first 4 days. Control group was topically treated with hydrogel without GSNO for the same period. Wound contraction and re-epithelialization were measured. Animals were sacrificed 21 days after wounding. Samples of lesion and normal tissue were formalin-fixed, paraffin embedded for histological analysis. RESULTS: Wound contraction, measured 14 and 21 days after wounding, was greater in the GSNO group than in the control group (P<0.05 for both). The re-epithelialized wound area, measured 14 days after wounding, was higher in the GSNO group than in the control group (P<0.05). A higher amount of inflammatory cells was observed in superficial and deep areas of the granulation tissue of the control group compared to the GSNO group. Twenty-one days after wounding, thin red-yellow collagen fibers arranged perpendicularly to the surface were found in the granulation tissue of the control group, whereas in the GSNO-treated group collagen fibers were thicker and arranged parallel to the surface. Increased number of mast cells was observed in the GSNO group compared with that in the control group. Vascularization and myofibroblast distribution were similar in both groups. CONCLUSION: Topical application of GSNO-containing hydrogel during the early phases of rat cutaneous wound repair accelerates wound closure and re-epithelialization and affects granulation tissue organization. 相似文献
7.
Abdominal trauma: use of oral contrast material for CT is safe 总被引:2,自引:0,他引:2
8.
P. J. Vaitkus Dr K. W. Johnston R. L. Bondar F. Stein P. A. J. Bascom Ly Mo M. Kassam L. C. Chadwick J. Mehi R. S. C. Cobbold 《Medical & biological engineering & computing》1990,28(4):306-311
During space flights, several clinical syndromes may be the result of changes in cerebral circulation. The purpose of the
paper is to describe the development and initial evaluation of a system for recording, processing and displaying transcranial
Doppler ultrasound (TCD) waveforms from the middle cerebral artery (MCA) in microgravity. Volunteers were repeatedly subjected
to 15–20 s intervals of microgravity (‘near zero gravity’) during flights on the KC-135 military aircraft. Continuous TCD
recordings from the MCA were stored on magnetic tape. The paper describes the system that was developed to digitise the Doppler
ultrasound data and markers that corresponded to the various levels of microgravity, obtain the maximum and mean Doppler waveforms,
identify the waveforms and quantify them. The results demonstrate the feasibility of making TCD recordings in a microgravity
environment and illustrate excellent performance of the system and its ease of operation. Quantitative waveform analysis of
the recordings from the first subject studied in the supine position showed statistically significant changes in MCA velocity
waveforms during microgravity. 相似文献
9.
10.
Life expectancy in British Marfan syndrome populations 总被引:2,自引:0,他引:2
JR Gray AB Bridges RR West L. McLeish AG Stuart JCS Dean MEM Porteous M. Boxer SJ Davies 《Clinical genetics》1998,54(2):124-128
A total of 206 patients with Marfan syndrome were ascertained throughout genetic clinics in Wales and Scotland during the period 1970–1990. There were 45 deaths representing 22% of the cohort. Mean age at death was 45.3 ± 16.5 years. 50% median cumulative survival in the total cohort (n = 206) was 53 years for males and 72 years for females. Multivariate analysis confirmed severity as the best independent indicator of survival. These findings and survival curves will assist in the counselling of British families and individuals with Marfan syndrome. 相似文献