全文获取类型
收费全文 | 1240篇 |
免费 | 145篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 97篇 |
妇产科学 | 17篇 |
基础医学 | 121篇 |
口腔科学 | 45篇 |
临床医学 | 112篇 |
内科学 | 349篇 |
皮肤病学 | 33篇 |
神经病学 | 41篇 |
特种医学 | 219篇 |
外科学 | 83篇 |
综合类 | 96篇 |
预防医学 | 79篇 |
眼科学 | 8篇 |
药学 | 66篇 |
中国医学 | 3篇 |
肿瘤学 | 56篇 |
出版年
2024年 | 3篇 |
2023年 | 15篇 |
2022年 | 7篇 |
2021年 | 27篇 |
2020年 | 22篇 |
2019年 | 9篇 |
2018年 | 21篇 |
2017年 | 42篇 |
2016年 | 39篇 |
2015年 | 30篇 |
2014年 | 68篇 |
2013年 | 78篇 |
2012年 | 39篇 |
2011年 | 26篇 |
2010年 | 65篇 |
2009年 | 68篇 |
2008年 | 29篇 |
2007年 | 67篇 |
2006年 | 37篇 |
2005年 | 30篇 |
2004年 | 28篇 |
2003年 | 16篇 |
2002年 | 19篇 |
2001年 | 40篇 |
2000年 | 16篇 |
1999年 | 28篇 |
1998年 | 80篇 |
1997年 | 65篇 |
1996年 | 61篇 |
1995年 | 51篇 |
1994年 | 46篇 |
1993年 | 44篇 |
1992年 | 14篇 |
1991年 | 9篇 |
1990年 | 19篇 |
1989年 | 23篇 |
1988年 | 24篇 |
1987年 | 14篇 |
1986年 | 19篇 |
1985年 | 17篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 4篇 |
1980年 | 8篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 12篇 |
1975年 | 9篇 |
排序方式: 共有1434条查询结果,搜索用时 23 毫秒
1.
By injecting small amounts of CO2 through a needle, one can move bowel or bladder from the intended path of instruments during interventional procedures. The technique worked well in six of seven cases in the pelvis and retroperitoneum; it was not effective in the mediastinum or midabdomen (n = 6). 相似文献
2.
外科医生和手术室人员经常接触手术设备产生的烟气,病人也会暴露于烟气中,特别是腹腔镜手术中产生的烟气滞留于腹腔内这一密闭空间并被吸收.这些烟气是一种与香烟烟气相似的毒性物质,然而对这种毒性物质的影响还未引起足够重视.应该采取必要措施尽可能减少手术中烟气的不良影响. 相似文献
3.
4.
Effects of rest interval on isokinetic strength and functional performance after short-term high intensity training. 总被引:4,自引:1,他引:3 下载免费PDF全文
OBJECTIVES: The ability to maximally generate active muscle tension during resistance training has been established to be a primary determinant for strength development. The influence of intrasession rest intervals may have a profound effect on strength gains subsequent to short-term high intensity training. The purpose of this study was to examine the effects of rest interval on strength and functional performance after four weeks of isokinetic training. METHODS: Fifteen healthy college aged individuals were randomly assigned to either a short rest interval group (group 1, n = 8) or a long rest interval group (group 2, n = 7). Subjects were evaluated for quadriceps and hamstring isokinetic strength at 60 (five repetitions) and 180 (30 repetitions) degrees/second and functional performance with the single leg hop for distance test. One leg of each subject was randomly assigned to a four week, three days/week isokinetic strength training programme for concentric knee extension and flexion performed at 90 degrees/second. Subjects in group 1 received a 40 second rest interval in between exercise sets, whereas subjects in group 2 received a 160 second rest period. RESULTS: A two factor analysis of variance for the pre-test--post-test gain scores (%) showed significantly greater improvements for isokinetic hamstring total work and average power at 180 degrees/second for the trained limb of subjects in group 2 than their contralateral non-trained limb and the subjects in group 1. Significantly greater improvements for the single leg hop for distance were also found for the trained limbs of subjects in both groups as compared with the non-trained limbs. CONCLUSIONS: The findings indicate that a relatively longer intrasession rest period resulted in a greater improvement in hamstring muscle strength during short term high intensity training. 相似文献
5.
6.
7.
8.
9.
Calciphylaxis – a topical overview 总被引:3,自引:0,他引:3
G Arseculeratne† AT Evans‡ SM Morley† 《Journal of the European Academy of Dermatology and Venereology》2006,20(5):493-502
'Calciphylaxis', a calcification syndrome associated with ischaemic cutaneous necrosis, is acquired naturally in humans in disease states. It is a life and limb-threatening complication, usually observed in patients with renal disease and secondary hyperparathyroidism, but known to occur in the absence of renal or parathyroid disease. The reported mortality rate, which ranges from 60-80%, relates to wound infection, sepsis and organ failure. It is a small-vessel vasculopathy, which is estimated to occur in about 4% of haemodialysis patients. Clinically, violaceous, reticulate areas of cutaneous necrosis and eschar may be evident, particularly in the extremities. In addition to the clinical picture, a raised calcium phosphorous product, an elevated parathyroid hormone level, radiographic evidence of vessel and soft-tissue calcification and the finding of mural calcification affecting small arteries and arterioles on histopathology help to confirm the diagnosis of this entity which generally has a poor prognosis. A high index of suspicion and an active multidisciplinary management approach, with rigorous attention to wound care and prevention of sepsis, are vital in the management of these patients. In this overview, we discuss the pathophysiology, clinical features and associations, risk factors, diagnosis and management issues relating to calciphylaxis. 相似文献
10.
Bastiaan R Klarenbeek Alexander AFA Veenhof Elly SM de Lange Willem A Bemelman Roberto Bergamaschi Piet Heres Antonio M Lacy Wim T van den Broek Donald L van der Peet Miguel A Cuesta 《BMC surgery》2007,7(1):16