全文获取类型
收费全文 | 23242篇 |
免费 | 553篇 |
国内免费 | 318篇 |
专业分类
耳鼻咽喉 | 155篇 |
儿科学 | 529篇 |
妇产科学 | 309篇 |
基础医学 | 3359篇 |
口腔科学 | 261篇 |
临床医学 | 1718篇 |
内科学 | 3752篇 |
皮肤病学 | 207篇 |
神经病学 | 1863篇 |
特种医学 | 952篇 |
外科学 | 3116篇 |
综合类 | 2379篇 |
现状与发展 | 1篇 |
一般理论 | 31篇 |
预防医学 | 1618篇 |
眼科学 | 203篇 |
药学 | 1895篇 |
29篇 | |
中国医学 | 261篇 |
肿瘤学 | 1475篇 |
出版年
2023年 | 157篇 |
2022年 | 430篇 |
2021年 | 948篇 |
2020年 | 599篇 |
2019年 | 851篇 |
2018年 | 1440篇 |
2017年 | 932篇 |
2016年 | 1297篇 |
2015年 | 1393篇 |
2014年 | 1596篇 |
2013年 | 2057篇 |
2012年 | 1608篇 |
2011年 | 964篇 |
2010年 | 1445篇 |
2009年 | 1132篇 |
2008年 | 830篇 |
2007年 | 805篇 |
2006年 | 719篇 |
2005年 | 646篇 |
2004年 | 552篇 |
2003年 | 336篇 |
2002年 | 234篇 |
2001年 | 239篇 |
2000年 | 264篇 |
1999年 | 223篇 |
1998年 | 214篇 |
1997年 | 169篇 |
1996年 | 132篇 |
1995年 | 71篇 |
1994年 | 76篇 |
1993年 | 77篇 |
1992年 | 81篇 |
1991年 | 85篇 |
1990年 | 103篇 |
1989年 | 105篇 |
1988年 | 88篇 |
1987年 | 65篇 |
1986年 | 54篇 |
1985年 | 55篇 |
1984年 | 58篇 |
1983年 | 30篇 |
1982年 | 41篇 |
1980年 | 28篇 |
1975年 | 28篇 |
1971年 | 32篇 |
1970年 | 29篇 |
1968年 | 37篇 |
1966年 | 22篇 |
1948年 | 22篇 |
1947年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 367 毫秒
101.
以光敏生物素标记的R3 cDNA克隆为模型,采用正交设计的方法,对影响核酸杂交反应的主要因素:杂交反应温度,反应时间,探针浓度及甲酰胺浓度作了综合性分析。当探针浓度为800μg/L,甲酰胺浓度为10mol/L,50℃杂交反应6h,可获得最高灵敏度(10pg)。 相似文献
102.
Donor bone grafts are an important aspect of orthopaedic surgery. The use of plain film as a pathological screening tool before
donor bone dispatch has revealed “lytic” lesions in proximal humeri. Donor demographics did not support the diagnosis of myeloma
and subsequent computed tomography (CT) scans of these bones identified the lesions as air, not pathology. In total, 27 long
bones were scanned and 100% (27/27 cases) exhibited air within the trabecular bone. Three distinct patterns were found: ovoid,
linear/branching, and broad channel. A longitudinal course of CT scans was performed to identify at which stage air appeared
within the bone. Pre-retrieval, preprocessing, and postprocessing scans revealed that air originated between the retrieval
and preprocessing stages of donor bone preparation. There may be multiple aetiology of this phenomenon, including bone retrieval
and natural decomposition. 相似文献
103.
Introduction Medication errors are a preventable cause of patient injury. In May 2003, as a result of a joint initiative by the Royal College
of Anaesthetists, the Association of Anaesthetists of Great Britain and Ireland, the Intercollegiate Faculty of Accident and
Emergency Medicine and the Intensive Care Society, a new colour code chart for syringe labelling was introduced. The introduction
of the new system has not been uniform in the Irish Republic with no national guidelines or time scale in place.
Methods A questionnaire was administered to doctors working in Anaesthesia in two Dublin teaching hospitals.
Results As much as 23% had administered an incorrect medication and 53% admitted to a near miss as a result of the introduction of
the new label.
Discussion Future action should focus on practical, common sense interventions including techniques such as those that reduce reliance
on memory, standardization, the use of protocols and checklists, and the elimination of look-alike products. 相似文献
104.
经喉内镜手术治疗喉部疾病的并发症分析 总被引:1,自引:1,他引:0
目的:分析经喉内镜手术后并发症的发生原冈及其防治措施。方法:使用从德国STORZ公司引进的国内首套喉内镜手术系统,治疗包括声带小结、声带息肉、喉乳头状瘤、声带囊肿、会厌囊肿、喉部炎性假瘤、喉部血管瘤等58例患者,并随访2~36个月,观察主要并发症并作相应处理。结果:58例患者中发音正常者54例,发音功能明显好转者4例。主要并发症有:牙齿松动2例,牙齿脱落1例,声带粘连1例,舌体麻木1例,舌运动障碍1例,术后拔管时喉痉挛1例。结论:经喉内镜手术可住微创的前提下彻底清除病灶,并最大限度地保留发音功能,只要术前严格掌握适应证,术中精细操作,其并发症是可以避免的。 相似文献
105.
April R. Bradley Elizabeth A. Yeater William O’Donohue 《The journal of primary prevention》2009,30(6):697-715
This study evaluated the short-term effectiveness of a mixed-gender sexual assault prevention program developed for college
students. Program participants (n = 177) were compared to non-program participants (n = 132) prior to the program and during a 2-week follow-up period on measures of rape myths, victim empathy, perceived negative
consequences and estimated likelihood of committing rape, sexual communication, sexual assault awareness, and risky dating
behavior. The prevention program was effective at increasing men’s victim empathy and decreasing their adherence to rape myths
but ineffective at changing women’s assault-related knowledge, participation in risky dating behaviors, and sexual communication
strategies. Limitations of the study and directions for future research in sexual assault prevention are addressed. Editors’ Strategic Implications: This study provides an important example of the limitations of a single session prevention programming approach (even if
it is well designed and executed) in addressing a systemic and pervasive problem like sexual assault on college campuses. 相似文献
106.
107.
F. D’Angelo M. Giudici M. Molina G. Margaria 《Journal of orthopaedics and traumatology》2005,6(3):111-116
Abstract
The femoral neck fracture is actually the most important traumatic event in the elderly, because of its high rate and terrible
complications. We reviwed clinical records of 314 patients treated in our institution with a bipolar implant for femoral neck
fracture. At a mean follow-up of 5 years, 15 patients (4.8%) were lost to followup so data for 299 patients was studied to
identity factors associated with mortality. Ten predictor variables were examined: age, sex, waiting time for surgery, pulmonary
dysfunction, fracture etiology, and comorbidity with ischemic heart disease, and heart failure, hypertension, cerebrovascular
disease, and chronic renal failure. Cumulative mortality rate during the first 6 months was 19% (55 of 299 patients) and in
the first year it was 25% (76 of 299). At logistic regression analysis, mortality was associated with age, male gender, waiting
period for surgery and presence of neoplastic disease or pathological fracture.
Waiting for surgery was a significant factor for mortality at 6, 12 and 24 months: patients surgically treated in the first
24 hours had lower mortality than those who waited longer. The risk of mortality in the first 6 months doubled for an age
increase of 12 years, while mortality within 2 years doubled for an age increase of 9 years. Although the motality rate after
surgery for femoral neck fracture was high in the first year (25%), it dropped off in successive years to levels observed
in a healthy population. Thus, we agree with the literature that femoral fracture is a risk factor for survival only in the
first year after trauma, above all in the elderly. 相似文献
108.
109.
Biocompatibility studies of the Anaconda stent-graft and observations of nitinol corrosion resistance. 总被引:3,自引:0,他引:3
Robert Guidoin Yvan Douville Michel F Baslé Martin King Georgi R Marinov Amidou Traoré Ze Zhang Fabien Guillemot Guy Dionne Ruwan Sumanasinghe André-Pierre Legrand Marie-France Guidoin Marie-Christine Porté-Durrieu Charles Baquey 《Journal of endovascular therapy》2004,11(4):385-403
PURPOSE: To validate the deployment, in vivo performance, biostability, and healing capacity of the Anaconda self-expanding endoprosthesis in a canine aortic aneurysm model. METHODS: Aneurysms were surgically created in 12 dogs by sewing a woven polyester patch onto the anterior side of the thoracic or abdominal aorta. Anaconda prostheses were implanted transfemorally for prescheduled periods (1 or 3 months). Aneurysm exclusion and stent-graft patency were monitored angiographically. Healing was assessed with histological analysis and scanning electron microscopy (SEM). Textile analysis determined the physical and chemical stability of the woven polyester material, while the biostability of the nitinol wires was evaluated with SEM and spectroscopy. RESULTS: All prostheses were intact at explantation. After 1 month, endothelial-like cells were migrating in a discontinuous manner both proximally and distally over the internal collagenous pannus at the device-host boundary. After 3 months, endothelialization had reached the midsections of the devices, with a thicker collagenous internal capsule. Patches of endothelial-like cells were sharing the luminal surface with thrombotic deposits. However, the wall of the device at the level of the aneurysm was generally poorly healed, with multiple thrombi scattered irregularly over the luminal surface. The polyester fabric was intact except for some filaments that were ruptured adjacent to the sutures and some abrasion caused by the nitinol wires. No evidence of corrosion was found on the nitinol stents. CONCLUSIONS: This Anaconda stent-graft has demonstrated its ability to exclude arterial aneurysms. The device used in this study was an experimental prototype, and the manufacturer has incorporated new immobilization features into the model for clinical use. The constituent materials appear to be suitable in terms of biocompatibility, biofunctionality, and short-term durability. 相似文献
110.