全文获取类型
收费全文 | 1212篇 |
免费 | 91篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 75篇 |
妇产科学 | 31篇 |
基础医学 | 129篇 |
口腔科学 | 49篇 |
临床医学 | 115篇 |
内科学 | 278篇 |
皮肤病学 | 39篇 |
神经病学 | 47篇 |
特种医学 | 220篇 |
外科学 | 72篇 |
综合类 | 46篇 |
一般理论 | 1篇 |
预防医学 | 83篇 |
眼科学 | 40篇 |
药学 | 38篇 |
中国医学 | 1篇 |
肿瘤学 | 60篇 |
出版年
2019年 | 15篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 12篇 |
2015年 | 11篇 |
2014年 | 23篇 |
2013年 | 24篇 |
2012年 | 25篇 |
2011年 | 20篇 |
2010年 | 25篇 |
2009年 | 26篇 |
2008年 | 26篇 |
2007年 | 27篇 |
2006年 | 30篇 |
2005年 | 25篇 |
2004年 | 36篇 |
2003年 | 29篇 |
2002年 | 15篇 |
2001年 | 40篇 |
2000年 | 32篇 |
1999年 | 30篇 |
1998年 | 46篇 |
1997年 | 48篇 |
1996年 | 43篇 |
1995年 | 40篇 |
1994年 | 26篇 |
1993年 | 38篇 |
1992年 | 38篇 |
1991年 | 30篇 |
1990年 | 24篇 |
1989年 | 37篇 |
1988年 | 42篇 |
1987年 | 60篇 |
1986年 | 41篇 |
1985年 | 25篇 |
1984年 | 13篇 |
1983年 | 15篇 |
1982年 | 23篇 |
1981年 | 24篇 |
1980年 | 19篇 |
1979年 | 12篇 |
1978年 | 19篇 |
1977年 | 18篇 |
1976年 | 23篇 |
1975年 | 16篇 |
1972年 | 10篇 |
1971年 | 8篇 |
1970年 | 8篇 |
1967年 | 7篇 |
1966年 | 9篇 |
排序方式: 共有1325条查询结果,搜索用时 218 毫秒
1.
Treatment versus no treatment in chronic open angle glaucoma 总被引:1,自引:0,他引:1
In a controlled randomized study 15 patients (20 eyes) with chronic open angle glaucoma and visual field defects were followed by greater than 1 year, 12 of them were followed for 3 years. Half of the group were untreated controls, the other half treated with pressure reducing medical therapy. At least 5 consecutive computerized visual fields were recorded (COMPETER) on each eye, and the linear regression coefficient was calculated. With the reservation for uncontrolled compliance no significant difference in the line of favourable effect of pressure reduction could be spotted, in spite of an average pressure reduction in the treated group of 4 mmHg. More important than this result, which is open to criticism for the smallness of the material, uncontrolled compliance etc, is the lesson that a randomized experiment with treated and non-treated glaucoma cases carried out in accordance with the Helsingfors convention is hardly feasible. 相似文献
2.
3.
4.
Ralls PW; Johnson MB; Kanel G; Dobalian DM; Colletti PM; Boswell WD Jr; Radin DR; Halls JM 《Radiology》1986,161(2):451-454
FM sonography - a signal-processing technique that uses frequency and phase information as well as amplitude data - shows promise in evaluation of patients with diffuse liver disease. In a prospective blinded review of 37 patients with biopsy-proved liver disease and 42 healthy volunteers, FM sonography was clearly superior to traditional amplitude-based (AM) sonography in distinguishing healthy from diseased subjects. Statistically significant differences were seen in accuracy (FM, 98.7%; AM, 84.8%), sensitivity (FM, 97.3%; AM, 70.3%), and negative predictive value (FM, 97.7%; AM, 78.8%). Our data also suggest that current FM sonographic techniques cannot differentiate among histologic findings associated with different hepatic parenchymal abnormalities. It is unclear, therefore, whether FM imaging can reduce the numbers of patients who require biopsy for diagnosis or the frequency of biopsy procedures in patients with known disease. 相似文献
5.
6.
7.
Yoshimitsu Kuroyanagi DR. ENG DR. SCI DR. MED ; Akihiko Shiraishi MD ; Yoshiteru Shirasaki MD ; Nobuaki Nakakita MD ; Yoshiaki Yasutomi MD ; Yasuo Takano MD ; Nobuyuki Shioya MD FACS 《Wound repair and regeneration》1994,2(2):122-129
A bilaminar wound dressing composed of an outer membrane and an inner three-dimensional matrix of a fabric or a sponge may be considered to constitute an ideal structure that promotes wound healing: the outer membrane prevents body fluid loss, controls water evaporation, and protects the wound surface from bacterial invasion, and the inner matrix encourages adherence by tissue growth into the matrix. Using this concept, we developed a biosynthetic wound dressing with a drug delivery capability. This medicated wound dressing is composed of a spongy sheet of a chitosane derivative and collagen mixture that is laminated to an antimicrobial-impregnated polyurethane membrane. In this study, a gentamycin sulfate-impregnated wound dressing was prepared and evaluated. The antimicrobial efficacy of this wound dressing was examined on an agar plate seeded with Pseudomonas aeruginosa. Also, the cytotoxicity of an antimicrobial released from this wound dressing was examined in an in vitro system with cultured skin substitutes. Both in vitro tests have shown that this wound dressing is capable of suppressing bacterial growth and minimizing cellular damage. In addition, in the treatment of wounds inflicted on rats and rabbits, this wound dressing was shown to be efficacious in covering full-thickness and split-thickness skin defects. Finally, the efficacy of this wound dressing was evaluated in a nonrandomized open-label study of 31 clinical cases. In 31 cases treated with this wound dressing, good or excellent wound healing was achieved. 相似文献
8.
DR Foster 《Journal of Medical Imaging and Radiation Oncology》1995,39(4):399-400
The use of self-expanding prostheses in the management of malignant oesophageal strictures has become well established. The majority of benign peptic oesophageal strictures can be successfully managed using endoscopic or fluoroscopically guided balloon oesophageal dilatation combined with long-term drug therapy, particularly using proton pumper inhibitors. Although endoscopic oesophageal dilatation can be performed on an outpatient basis, it requires repeated hospital visits. There is a small risk of oesophageal perforation whilst cardio-respiratory complications may be encountered during the use of intravenous sedation in an elderly population. The use of a self-expanding Strecker stent in a 98 year old woman with a benign oesophageal stricture is described. 相似文献
9.
A total of 261 women in early pregnancy, either with mild symptoms of ectopic pregnancy (EP) or being at an increased risk for this condition, were included in a longitudinal study. The effectiveness of different diagnostic measures in obtaining correct final diagnoses was analyzed. In addition to clinical findings and symptoms, the use of serum human chorionic gonadotropin, serum progesterone, endovaginal sonography and a risk score for EP were all proven to be valuable in distinguishing normal intrauterine pregnancies from pathological pregnancies. 相似文献
10.