全文获取类型
收费全文 | 1281552篇 |
免费 | 98178篇 |
国内免费 | 1992篇 |
专业分类
耳鼻咽喉 | 18464篇 |
儿科学 | 44718篇 |
妇产科学 | 35074篇 |
基础医学 | 182522篇 |
口腔科学 | 33621篇 |
临床医学 | 111418篇 |
内科学 | 258810篇 |
皮肤病学 | 28062篇 |
神经病学 | 100492篇 |
特种医学 | 51255篇 |
外国民族医学 | 660篇 |
外科学 | 196814篇 |
综合类 | 27115篇 |
现状与发展 | 1篇 |
一般理论 | 377篇 |
预防医学 | 95943篇 |
眼科学 | 28061篇 |
药学 | 95057篇 |
2篇 | |
中国医学 | 2438篇 |
肿瘤学 | 70818篇 |
出版年
2018年 | 13202篇 |
2017年 | 10007篇 |
2016年 | 10961篇 |
2015年 | 12449篇 |
2014年 | 17261篇 |
2013年 | 26347篇 |
2012年 | 36165篇 |
2011年 | 38231篇 |
2010年 | 22921篇 |
2009年 | 21906篇 |
2008年 | 36801篇 |
2007年 | 39390篇 |
2006年 | 39676篇 |
2005年 | 38584篇 |
2004年 | 37741篇 |
2003年 | 36569篇 |
2002年 | 35907篇 |
2001年 | 64061篇 |
2000年 | 66577篇 |
1999年 | 56469篇 |
1998年 | 15148篇 |
1997年 | 13768篇 |
1996年 | 14209篇 |
1995年 | 13466篇 |
1994年 | 12778篇 |
1993年 | 11812篇 |
1992年 | 44597篇 |
1991年 | 43504篇 |
1990年 | 42268篇 |
1989年 | 40154篇 |
1988年 | 36937篇 |
1987年 | 36272篇 |
1986年 | 33657篇 |
1985年 | 32320篇 |
1984年 | 24159篇 |
1983年 | 20294篇 |
1982年 | 11734篇 |
1981年 | 10701篇 |
1980年 | 9540篇 |
1979年 | 21363篇 |
1978年 | 14838篇 |
1977年 | 12553篇 |
1976年 | 11704篇 |
1975年 | 12652篇 |
1974年 | 14684篇 |
1973年 | 14131篇 |
1972年 | 12961篇 |
1971年 | 11738篇 |
1970年 | 11068篇 |
1969年 | 10033篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
William P. Grant DPM Laurence G. Rubin DPM Guy R. Pupp DPM George Vito DPM Dwayne Jacobus DPM Erin A. Jerlin DPM Harry S. Tam DPM 《The Journal of foot and ankle surgery》2007,46(5):325-335
The purpose of this study was to assess 7 methods of fixation for a midtarsal osteotomy. Polyurethane foam models (N = 6) and cadaver specimens (N = 4-7) were used to examine the force generated by the different constructs of fixation. A midtarsal osteotomy was performed on each specimen in the test groups. The osteotomies were fixated either with 2 parallel 0.062-in Kirschner wires and 40-mm-long, 4-mm partially threaded, cancellous, cannulated titanium screws, an external ring fixator (frame), a frame with wires tensioned (tension), a frame with wires tensioned and compressed toward the osteotomy (tension and compression), a frame with tension, compression, and parallel Kirschner wires, or a frame with tension, compression, and two 4.0 cannulated parallel screws, respectively. Each model was fixated, and the force generated by the construct across the osteotomy was recorded via the use of pressure-sensitive film. Statistical analysis of the data in the polyurethane foam group determined that the use of frame with tension, compression, and two 4.0 parallel cannulated screws was statistically superior to 1) frame, 2) frame with tension, 3) 2 parallel Kirschner wires, 4) two 4.0 cannulated parallel screws, and 5) frame with tension and compression. A cadaver study determined that the frame with tension, compression, and 2 parallel Kirschner wires was statistically superior to 1) frame and 2) two parallel Kirschner wires. These findings suggest that there is a difference in the force generated by the type of fixation construct across a midtarsal osteotomy. 相似文献
962.
F Serracino-Inglott P Myers 《European journal of vascular and endovascular surgery》2007,33(5):575-577
INTRODUCTION: An endovascular procedure for excluding an aorto-iliac aneurysm whilst simultaneously preserving one internal iliac artery is described in a patient with complex iliac pathology. REPORT: The procedure involved the use of Advanta V12 covered stents to bridge the gap between the contralateral limb of the main body of a custom-made Zenith stent graft and the internal iliac artery on the side of an external iliac artery occlusion. DISCUSSION: Minimal modifications to the standard design of modular stent grafts make it possible to treat high risk patient with complex pathology with minimal morbidity. 相似文献
963.
Inguinal hernia is a known complication after radical retropubic prostatectomy (RRP). We have investigated whether other types
of lower midline incision surgery in males increase the risk of inguinal hernia. Male patients operated with open prostatectomy
for benign prostate hyperplasia (n = 95), pelvic lymph node dissection for staging of prostate cancer (n = 88), or cystectomy for bladder cancer (n = 76) were identified and were sent questionnaires in which they were asked about postoperative inguinal hernia morbidity.
Two-hundred and seventy-one men operated with RRP had previously received a similar questionnaire. The answers were compared
with those from a control group of 953 men who had not undergone surgery. Annual attributional hernia morbidity and Kaplan–Meier
hernia-free survival were calculated. The cumulative incidence of post-operative inguinal hernia and annual attributional
hernia morbidity after the respective surgical procedures were clearly higher during the early years post-operation than for
nonoperated patients. Inguinal hernia is a common postoperative complication in males after all the lower midline incision
surgery investigated. 相似文献
964.
A. Ravikumar S. Mohanty R. P. Vatsanath S. Raghunandhan 《Indian journal of otolaryngology and head and neck surgery》2004,56(4):317-320
The co-existence of fungal elements in allergic nasal Polyposis, has given rise to a distinct clinical entity known as ‘Allergic
fungal sinusitis ’ (AF’S). Many a time, these fungal elements may not be diagnosed pre-operatively by routine diagnostic nasal
endoscopy or CT scan of paranasal sinuses, due to the florid presentation of nasal polyps, which usually obscure the underlying
fungal pathology. The diagnosis is often made intra-operatively. The post-operative confirmation of AFS is by histopathology,
fungal smear, fungal culture, allergic murin study and fungal specific IgE titres. We report a series often such cases done
in our institution, which highlight that AFS should be considered as a differential diagnosis in Sinonasal Polyposis cases,
for their effective management. 相似文献
965.
Exercise advice is a well established component of the conservative management of intermittent claudication. Supervised programmes of exercise remain relatively uncommon and are provided mainly in secondary care. This review outlines the evidence for the effectiveness of different exercise regimens and the relative benefits of exercise therapy, where comparisons have been made with medical therapy, angioplasty and surgery. 相似文献
966.
John P Norvell Andres T Blei Borko D Jovanovic Josh Levitsky 《Liver transplantation》2007,13(10):1428-1434
Hepatitis is a rare complication of herpes simplex virus (HSV), often leading to acute liver failure (ALF), liver transplantation (LT), and/or death. Our aim was to identify variables associated with either survival or progression (death/LT), based on an analysis of cases in the literature and our institution. A total of 137 cases (132 literature, 5 institutional) of HSV hepatitis were identified. The main features at clinical presentation were fever (98%), coagulopathy (84%), and encephalopathy (80%). Rash was seen in less than half of patients. Most cases (58%) were first diagnosed at autopsy and the diagnosis was suspected clinically prior to tissue confirmation in only 23%. Overall, 74% of cases progressed to death or LT, with 51% in acyclovir-treated patients as compared to 88% in the untreated subjects (P=0.03). Variables on presentation associated with death or need for LT compared to spontaneous survival: male gender, age>40 yr, immunocompromised state, ALT>5,000 U/L, platelet count<75x10(3)/L, coagulopathy, encephalopathy, and absence of antiviral therapy. In conclusion, HSV hepatitis has a high mortality and is often clinically unsuspected. Patients who are male, older, immunocompromised, and/or presenting with significant liver dysfunction are more likely to progress to death and should thus be evaluated for LT early. Based on the frequent delay in HSV diagnosis, low risk-benefit ratio, and significantly improved outcomes, empiric acyclovir therapy for patients presenting with ALF of unknown etiology is recommended until HSV hepatitis is excluded. 相似文献
967.
A K Burroughs L Marelli E Cholongitas P Manousou K Rolles V Karam V Delvart R Adam C Sabin 《Liver transplantation》2007,13(6):935-6; author reply 937
968.
Fractures of the calcaneus generally occur in the event of high-energy trauma, resulting in complex, three-dimensionally oriented fracture patterns. Surgical management is generally indicated for displaced intra-articular fractures, which allows restoration of calcaneal height, width and overall morphology, in addition to the posterior facet articular surface where possible, and allows for a late in situ arthrodesis as a means of salvage in the event of posttraumatic arthritis. What follows is a brief discussion of our preferred methods in the diagnosis and management of calcaneal fractures. 相似文献
969.
The aims in implantation of an artificial replacement hip joint should be lasting fixation and pain-free functioning of the elements of the prosthesis in the bone and minimal friction between the articulating parts. Despite improvements in bone cement and in cementing techniques, the question of whether cemented or cement-free hip replacement systems give better results in the long term is still the subject of controversy. The basics of cemented and cement-free implantation of prostheses, of the surgical techniques and of the corresponding results and complications are presented. Despite all the advantages of cement-free implantation over cemented implantation of prostheses, while the former yield good results in the short term, long-term results with a follow-up period of over 10 years are available for only a limited number of cement-free implants. Therefore, until long-term (15-year) results for the cement-free prosthetic systems currently on the market are available, cemented anchorage as practised since the introduction and application of the second-generation cementing techniques with the reduction of the risk of revision surgery by approximately 20% at present should be regarded as standard despite the more demanding implantation process. 相似文献
970.