全文获取类型
| 收费全文 | 1790394篇 |
| 免费 | 158267篇 |
| 国内免费 | 3855篇 |
专业分类
| 耳鼻咽喉 | 23319篇 |
| 儿科学 | 60449篇 |
| 妇产科学 | 47461篇 |
| 基础医学 | 257309篇 |
| 口腔科学 | 53222篇 |
| 临床医学 | 167137篇 |
| 内科学 | 357094篇 |
| 皮肤病学 | 44810篇 |
| 神经病学 | 144912篇 |
| 特种医学 | 66355篇 |
| 外国民族医学 | 243篇 |
| 外科学 | 271126篇 |
| 综合类 | 39255篇 |
| 现状与发展 | 4篇 |
| 一般理论 | 596篇 |
| 预防医学 | 132503篇 |
| 眼科学 | 41648篇 |
| 药学 | 130185篇 |
| 7篇 | |
| 中国医学 | 5459篇 |
| 肿瘤学 | 109422篇 |
出版年
| 2021年 | 14567篇 |
| 2020年 | 12944篇 |
| 2019年 | 23781篇 |
| 2018年 | 28867篇 |
| 2017年 | 24931篇 |
| 2016年 | 27092篇 |
| 2015年 | 29368篇 |
| 2014年 | 36820篇 |
| 2013年 | 49700篇 |
| 2012年 | 58366篇 |
| 2011年 | 61148篇 |
| 2010年 | 41450篇 |
| 2009年 | 36382篇 |
| 2008年 | 55400篇 |
| 2007年 | 57751篇 |
| 2006年 | 58203篇 |
| 2005年 | 55215篇 |
| 2004年 | 53318篇 |
| 2003年 | 50519篇 |
| 2002年 | 48733篇 |
| 2001年 | 92635篇 |
| 2000年 | 94359篇 |
| 1999年 | 77403篇 |
| 1998年 | 20096篇 |
| 1997年 | 17564篇 |
| 1996年 | 17613篇 |
| 1995年 | 16927篇 |
| 1994年 | 15476篇 |
| 1993年 | 14263篇 |
| 1992年 | 57503篇 |
| 1991年 | 55370篇 |
| 1990年 | 53057篇 |
| 1989年 | 50841篇 |
| 1988年 | 46209篇 |
| 1987年 | 45004篇 |
| 1986年 | 42299篇 |
| 1985年 | 40053篇 |
| 1984年 | 29434篇 |
| 1983年 | 24970篇 |
| 1982年 | 13973篇 |
| 1979年 | 25570篇 |
| 1978年 | 17604篇 |
| 1977年 | 14941篇 |
| 1976年 | 13895篇 |
| 1975年 | 14585篇 |
| 1974年 | 17646篇 |
| 1973年 | 16951篇 |
| 1972年 | 15685篇 |
| 1971年 | 14458篇 |
| 1970年 | 13438篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
111.
Objectives
Iatrogenic injury of the Profunda Femoris Artery (PFA) at time of hip fixation surgery can increase morbidity and mortality and prolong the hospital stay. This is an injury that tends to pass unnoticed as a cause of postoperative deterioration despite being frequently reported in the literature. Our study aims to describe the anatomy of the PFA in relation to the medial femoral cortex with specific emphasis on its orientation relative to the position of a sliding hip screw side plate construct. By doing so we are able to present clear guidance to orthopaedic surgeons on how to avoid iatrogenic PFA injury at the time of hip fracture fixation.Methods
Using Computed Tomography Angiographic (CTA) studies, the course of the PFA in relation to the medial femoral cortex was traced in 44 patients (28 males and 16 females) with mean age of 65.6 years. Coronal and axial CT sections were cross-linked to specify the position of the PFA at 1?cm intervals.Results
The course of the artery could be divided into three parts relative to a fixed reference point. Proximal and distal parts of the artery were in a safer position in comparison to the middle part of the artery that was found very close to the femoral cortex and along the coronal axis of the femur (mean angle 2.9° from the femoral coronal axis and 13.8?mm from the medial femoral cortex). Using the commercially available side plate constructs, this part of the artery corresponded to the distal part of the plate (third and fourth holes).Conclusion
Special attention needs to be practiced by the operating surgeon while drilling into the third and fourth holes of the side plate. 相似文献112.
113.
114.
115.
Alan. B. Franklin Sarah N. Bevins Jeremy W. Ellis Ryan S. Miller Susan A. Shriner J. Jeffrey Root Daniel P. Walsh Thomas J. Deliberto 《Transboundary and Emerging Diseases》2019,66(2):705-714
Using data on waterfowl band recoveries, we identified spatially explicit hotspots of concentrated waterfowl movement to predict occurrence and spatial spread of a novel influenza A virus (clade 2.3.4.4) introduced from Asia by waterfowl from an initial outbreak in North America in November 2014. In response to the outbreak, the hotspots of waterfowl movement were used to help guide sampling for clade 2.3.4.4 viruses in waterfowl as an early warning for the US poultry industry during the outbreak . After surveillance sampling of waterfowl, we tested whether there was greater detection of clade 2.3.4.4 viruses inside hotspots. We found that hotspots defined using kernel density estimates of waterfowl band recoveries worked well in predicting areas with higher prevalence of the viruses in waterfowl. This approach exemplifies the value of ecological knowledge in predicting risk to agricultural security. 相似文献
116.
117.
M. Iachina P.M. Ljungdalh R.G. Sørensen L. Kaerlev J. Blaakær O. Trosko N. Qvist B.M. Nørgård 《Clinical oncology (Royal College of Radiologists (Great Britain))》2019,31(2):115-123
Aims
To examine the influence of pre-existing psychiatric disorder on the choice of treatment in patients with gynaecological cancer.Materials and methods
The analyses were based on all patients who underwent surgical treatment for endometrial, ovarian or cervical cancer who were registered in the Danish Gynecological Cancer Database in the years 2007–2014 (3059 patients with ovarian cancer, 5100 patients with endometrial cancer and 1150 with cervical cancer). Logistic regression model and Cox regression model, adjusted for relevant confounders, were used to estimate the effect of pre-existing psychiatric disorder on the course of cancer treatment. Our outcomes were (i) presurgical oncological treatment, (ii) macroradical surgery for patients with ovarian cancer, (iii) radiation/chemotherapy within 30 days and 100 days after surgery and (iv) time from surgery to first oncological treatment.Results
In the group of patients with ovarian cancer, more patients with a psychiatric disorder received macroradical surgery versus patients without a psychiatric disorder, corresponding to an adjusted odds ratio of 1.24 (95% confidence interval 0.62–2.41) and the chance for having oncological treatment within 100 days was odds ratio = 1.26 (95% confidence interval 0.77–2.10). As for patients with endometrial cancer, all outcome estimates were close to unity. The adjusted odds ratio for oncological treatment within 30 days after surgery in patients with cervical cancer with a history of psychiatric disorder was 0.20 (95% confidence interval 0.03–1.54).Conclusions
We did not find any significant differences in the treatment of ovarian and endometrial cancer in patients with pre-existing psychiatric diagnoses. When it comes to oncological treatment, we suggest that increased attention should be paid to patients with cervical cancer having a pre-existing psychiatric diagnosis. 相似文献118.
119.
120.
Katherine M. Duszynski Nicole L. Pratt John W. Lynch Jesia G. Berry Michael S. Gold 《Vaccine》2019,37(2):280-288