全文获取类型
收费全文 | 1074篇 |
免费 | 85篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 57篇 |
妇产科学 | 15篇 |
基础医学 | 120篇 |
口腔科学 | 15篇 |
临床医学 | 134篇 |
内科学 | 279篇 |
皮肤病学 | 6篇 |
神经病学 | 55篇 |
特种医学 | 150篇 |
外科学 | 127篇 |
综合类 | 9篇 |
预防医学 | 50篇 |
眼科学 | 17篇 |
药学 | 69篇 |
中国医学 | 2篇 |
肿瘤学 | 63篇 |
出版年
2023年 | 4篇 |
2022年 | 7篇 |
2021年 | 15篇 |
2020年 | 10篇 |
2019年 | 20篇 |
2018年 | 18篇 |
2017年 | 23篇 |
2016年 | 23篇 |
2015年 | 23篇 |
2014年 | 26篇 |
2013年 | 36篇 |
2012年 | 44篇 |
2011年 | 42篇 |
2010年 | 32篇 |
2009年 | 39篇 |
2008年 | 49篇 |
2007年 | 36篇 |
2006年 | 34篇 |
2005年 | 41篇 |
2004年 | 31篇 |
2003年 | 29篇 |
2002年 | 20篇 |
2001年 | 25篇 |
2000年 | 27篇 |
1999年 | 22篇 |
1998年 | 39篇 |
1997年 | 61篇 |
1996年 | 43篇 |
1995年 | 38篇 |
1994年 | 35篇 |
1993年 | 25篇 |
1992年 | 14篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 18篇 |
1988年 | 19篇 |
1987年 | 18篇 |
1986年 | 21篇 |
1985年 | 23篇 |
1984年 | 14篇 |
1983年 | 13篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 10篇 |
1978年 | 7篇 |
1977年 | 15篇 |
1976年 | 6篇 |
1975年 | 10篇 |
1974年 | 3篇 |
1970年 | 4篇 |
排序方式: 共有1174条查询结果,搜索用时 15 毫秒
1.
Intracranial circulation: pulse-sequence considerations in three- dimensional (volume) MR angiography 总被引:2,自引:0,他引:2
The technique and feasibility of magnetic resonance (MR) angiography of intracranial vessels were studied in 35 healthy volunteers. Variations in image orientation, repetition time (TR), and flip angle were evaluated to determine their effects on flow-related enhancement. Gradient modifications--including echo time (TE), motion compensation, bandwidth, and field of view--were also studied in an effort to reduce motion-induced phase shifts. Results indicated that a FISP (fast imaging with steady precession) sequence with a TR of 50 msec, TE of 15 msec, velocity compensation in the read and section-select directions, acceleration compensation in the read direction, anisotropic volume, and a 1.25-mm partition thickness produced three-dimensional angiographic MR images that were accurate and reproducible in the depiction of the major intracranial vessels. Difficulties with field of view, persistent signal void secondary to higher-order motion, and spatial resolution remain major problems requiring additional study. 相似文献
2.
Mesh fixation with human fibrin glue (Tissucol) in open tension-free inguinal hernia repair: a preliminary report 总被引:2,自引:0,他引:2
S. Canonico A. Santoriello F. Campitiello A. Fattopace A. Della Corte I. Sordelli R. Benevento 《Hernia》2005,9(4):330-333
Background: The Lichtenstein technique for inguinal hernia repair is easy to learn and associated with few complications. However, recent
studies have suggested that this technique is inferior to some ‘sutureless’ repair systems in terms of perceived difficulty,
operating time, surgeon satisfaction, etc. Methods: We employed a sutureless Lichtenstein technique in 80 consecutive patients with primary unilateral inguinal hernia, to assess
patient and trainee surgeon outcomes. Human fibrin glue was used in place of conventional sutures. Results: The mean operating time was 36 min and all patients were discharged 5–6 h after the operation. On a 100-point visual analogue
scale, the surgeons rated the difficulty of the operation as low (mean score, 31), and perceived satisfaction as high (mean
score, 84). No complications were observed at 12-month follow-up. Conclusion: This study confirms the efficacy of mesh fixation with human fibrin glue, and supports the viability of a sutureless Lichtenstein
procedure. 相似文献
3.
4.
Paediatric dacryocystorhinostomy 总被引:1,自引:0,他引:1
KN Hakin FRCS FRCOphth TJ Sullivan FRACO FRACS A Sharma FCOphth † RAN Welham FRCS FCOphth † 《Clinical & experimental ophthalmology》1994,22(4):231-235
Of 258 cases of dacryocystorhinostomy performed on children in the period September 1981 to September 1991, 130 were for simple, unresolved congenital nasolacrimal duct obstruction. Other indications for surgery included punctal agenesis, lacrimal fistula, post-traumatic and post-inflammatory canalicular obstruction. Of 177 children without canalicular pathology, 171 (96%) were relieved of symptoms with one operation, without canalicular intubation. Of 81 cases with canalicular disease, 55 of 70 (79%) who underwent DCR plus canalicular intubation, and 10 of 11 who underwent DCR plus Lester-Jones tube, were substantially improved with one operation. No child required peroperative or postoperative blood transfusion. Dacryocystorhinostomy in childhood, in experienced surgical hands, is a safe procedure, achieving relief of symptoms in most cases, particularly in the absence of canalicular disease. 相似文献
5.
6.
7.
Factors influencing women to undergo screening mammography 总被引:2,自引:0,他引:2
8.
Treatment of type B aortic dissection: endoluminal repair or conventional medical therapy? 总被引:4,自引:0,他引:4
Giovanni Dialetto Franco E Covino Giancarlo Scognamiglio Sabrina Manduca Alessandro Della Corte Bruno Giannolo Michelangelo Scardone Maurizio Cotrufo 《European journal of cardio-thoracic surgery》2005,27(5):826-830
OBJECTIVE: To evaluate the mid-term results of endovascular stent-grafting for type B aortic dissection, in comparison with those of standard medical therapy in uncomplicated cases. METHODS: Between January 1999 and 2004, among 56 patients (mean age 59.5+/-11.5 years) with type B aortic dissection, hypotensive medical therapy was the only treatment in 28 uncomplicated cases, (group A), while stent-graft implantation was performed in 28 patients with uncontrolled hypertension, persistent pain or evidence of dissection progression or complication (group B). In 14 cases (50%) the procedure was performed in an acute setting. Stent-grafting procedures were monitored with intraoperative trans-esophageal echocardiography and cine-angiography. CT scan and trans-esophageal echocardiography were performed before hospital discharge, at 6 and 12 months and then yearly. RESULTS: Follow-up (range 1-61 months, average 18.1+/-16.9 months) was 100% complete. In-hospital mortality was 10.7% (three patients, all belonging to Group B; P=0.24). No spinal cord injuries were observed. Early endoleak occurred in one patient (3.5%). Mid-term mortality was lower in Group B, although the difference was not significant (10.7 versus 14.3% in Group A, P=0.71). Follow-up CT scans evidenced complete thrombosis of the false lumen in 75% cases in Group B, 10.7% in Group A (P=0.0001), and an aneurismal dilatation of the descending aorta in 3.5% cases in Group B, 28.5% in Group A (P=0.02). CONCLUSIONS: Although with still considerable early mortality, endovascular stent-graft implantation is an effective option for the treatment of complicated type B aortic dissection. Endovascular treatment achieved a better mid-term fate of the descending thoracic aorta than medical therapy alone, even in patients with worse preoperative conditions. 相似文献
9.
10.