全文获取类型
收费全文 | 1268篇 |
免费 | 91篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 57篇 |
妇产科学 | 50篇 |
基础医学 | 122篇 |
口腔科学 | 43篇 |
临床医学 | 105篇 |
内科学 | 284篇 |
皮肤病学 | 15篇 |
神经病学 | 81篇 |
特种医学 | 99篇 |
外科学 | 238篇 |
综合类 | 78篇 |
一般理论 | 1篇 |
预防医学 | 45篇 |
眼科学 | 41篇 |
药学 | 66篇 |
1篇 | |
中国医学 | 1篇 |
肿瘤学 | 60篇 |
出版年
2023年 | 18篇 |
2022年 | 26篇 |
2021年 | 39篇 |
2020年 | 33篇 |
2019年 | 33篇 |
2018年 | 36篇 |
2017年 | 23篇 |
2016年 | 30篇 |
2015年 | 43篇 |
2014年 | 45篇 |
2013年 | 60篇 |
2012年 | 59篇 |
2011年 | 70篇 |
2010年 | 60篇 |
2009年 | 52篇 |
2008年 | 53篇 |
2007年 | 73篇 |
2006年 | 48篇 |
2005年 | 48篇 |
2004年 | 39篇 |
2003年 | 45篇 |
2002年 | 25篇 |
2001年 | 22篇 |
2000年 | 22篇 |
1999年 | 21篇 |
1998年 | 31篇 |
1997年 | 24篇 |
1996年 | 21篇 |
1995年 | 20篇 |
1994年 | 24篇 |
1993年 | 15篇 |
1992年 | 18篇 |
1991年 | 13篇 |
1990年 | 17篇 |
1989年 | 19篇 |
1988年 | 27篇 |
1987年 | 21篇 |
1986年 | 13篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1977年 | 5篇 |
1975年 | 9篇 |
1974年 | 8篇 |
1973年 | 15篇 |
1972年 | 8篇 |
1971年 | 7篇 |
1967年 | 4篇 |
排序方式: 共有1394条查询结果,搜索用时 9 毫秒
1.
2.
L. C. Teoh 《ANZ journal of surgery》2007,77(Z1):A35-A35
The severely of skin loss and the options of resurfacing is determined by taking into account the following factors. 1) The size & location of the defect, 2) The depth of the defect and the quality of the tissue bed, 3) The extent of exposed vital structures, 4) The associated bone and other tissues injuries, 5) The availability of donor skin flap. The size of the defect is the most important factor in choosing a resurfacing option. The size can be categorized into small, medium and large. A small defect is one that is less than 5 cm2 in size, a medium defect is between 5 to 15 cm2, and a large defect is greater than 15 cm2. Local flaps are usually sufficient to cover small defects <5 cm2. These are advancement flaps or rotation and transposition flaps. Regional flaps are indicated to resurface these medium‐sized defects 5 to 15 cm2. The donor is within the same region of the hand, from one of the digits or from dorsum and palmar surfaces of the hand. It is usually based on vascular or NV pedicles. Large defects >15 cm2 will need larger flaps for coverage. These large flaps are pedicled distant flaps and free flaps. In these severe injuries, there is usually associated bone and soft tissues injuries. These injuries can be reconstructed as a single stage combined reconstruction or multi‐staged reconstructions. The resurfacing should always be given priority. 相似文献
3.
Brightness discrimination and contrast sensitivity in chronic glaucoma--a clinical study. 总被引:1,自引:0,他引:1
The visual acuity, the difference in sensitivity of the two eyes to light (brightness ratio), and contrast sensitivity were assessed in 28 patients with chronic open angle glaucoma and compared with those of 41 normal controls of similar ages and visual acuity. The results obtained were related to the results of Tübingen visual field analysis in patients with glaucoma. Twenty-four of the 28 glaucoma patients (86%) had a significant disparity in brightness ratio between the two eyes. This was found to match the frequency of visual field loss. Moreover, there was a significant relationship between the interocular differences in brightness sense and the difference in the degree of visual field loss between the two eyes. Of the glaucoma patients 39% had sum contrast sensitivities outside the normal range for age-matched normal controls. No significant correlation was found between the interocular difference in brightness sense and the visual acuity or the interocular difference in sum contrast sensitivity. It is concluded that, in the presence of a normal visual acuity, the brightness ratio test warrants evaluation as a potential screening test for chronic open angle glaucoma. 相似文献
4.
Anulus fibrosus in bulging intervertebral disks 总被引:1,自引:0,他引:1
In this investigation the association of radial tears of the anulus fibrosus and bulging of the intervertebral disk was studied. An index of disk bulging was measured in sagittal anatomic sections in 149 lumbar disks from 31 cadavers. The indexes of disk bulging were correlated with stages of disk development and the presence of an annular tear. The largest disk-bulging indexes were always associated with radial tears of the anulus. Eighty-four percent of the disks with radial tears had disk-bulging indexes greater than 2.5 mm. Most normal adult disks had an index of less than 2.5 mm. The results challenge the concept that the anulus fibrosus is intact in bulging disks, although ruptured in herniated disks. 相似文献
5.
6.
7.
8.
We present a patient with an asymptomatic painless medial elbow swelling of one year's duration, which was diagnosed as a ganglion originating from a non-united avulsion fracture of the medial epicondyle with a pseudarthrosis. Medial elbow ganglia are unusual lesions typically arising from the medial aspect of the ulnohumeral joint capsule, often in combination with symptoms of cubital tunnel syndrome. To our knowledge, a ganglion arising from a pseudarthrosis has not been reported in the literature, and should be considered in the differential diagnoses of lesions encountered over the site of fracture non-union in proximity to a joint. 相似文献
9.
10.
Laser surface modification of poly(epsilon-caprolactone) (PCL) membrane for tissue engineering applications 总被引:2,自引:0,他引:2
Ultra-thin polycaprolactone (PCL) produced by bi-axial stretching was previously shown to have significant advantage for membrane tissue engineering. However, the permeability of the membrane needs to be enhanced. In this study, ablation experiments using femtosecond laser and excimer laser were carried out to modify the PCL surface. The use of the femtosecond laser produces neat drilled-through holes while the excimer laser is employed to produce blind-holes on the membrane. The modified surface of the membrane was studied and analyzed for different laser parameters (such as pulse energy and pulse repetition rate and characterized using several techniques that include optical microscopy, scanning electron microscopy and water contact angle measurements). Results showed that the morphological surface changes with different laser parameters, and the water contact angle decreases as the surface of the membrane is modified. The decrease in water contact angle suggests that surface of the membrane had become more hydrophilic than the non-laser treated membrane. The present study demonstrated that laser surface modification on the PCL can be achieved with high degree of success and precision. This paved the way for further enhancement in membrane tissue engineering. 相似文献