全文获取类型
收费全文 | 1485篇 |
免费 | 81篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 70篇 |
妇产科学 | 15篇 |
基础医学 | 121篇 |
口腔科学 | 21篇 |
临床医学 | 332篇 |
内科学 | 319篇 |
皮肤病学 | 31篇 |
神经病学 | 70篇 |
特种医学 | 166篇 |
外科学 | 169篇 |
综合类 | 21篇 |
预防医学 | 78篇 |
眼科学 | 16篇 |
药学 | 108篇 |
肿瘤学 | 27篇 |
出版年
2022年 | 9篇 |
2021年 | 20篇 |
2019年 | 21篇 |
2018年 | 23篇 |
2017年 | 12篇 |
2016年 | 24篇 |
2015年 | 34篇 |
2014年 | 34篇 |
2013年 | 40篇 |
2012年 | 62篇 |
2011年 | 76篇 |
2010年 | 53篇 |
2009年 | 36篇 |
2008年 | 35篇 |
2007年 | 50篇 |
2006年 | 54篇 |
2005年 | 56篇 |
2004年 | 36篇 |
2003年 | 36篇 |
2002年 | 44篇 |
2001年 | 24篇 |
2000年 | 31篇 |
1999年 | 35篇 |
1998年 | 42篇 |
1997年 | 51篇 |
1996年 | 53篇 |
1995年 | 42篇 |
1994年 | 27篇 |
1993年 | 26篇 |
1992年 | 22篇 |
1991年 | 22篇 |
1990年 | 21篇 |
1989年 | 34篇 |
1988年 | 47篇 |
1987年 | 42篇 |
1986年 | 36篇 |
1985年 | 24篇 |
1984年 | 11篇 |
1983年 | 18篇 |
1982年 | 15篇 |
1981年 | 18篇 |
1980年 | 11篇 |
1979年 | 18篇 |
1978年 | 12篇 |
1977年 | 14篇 |
1975年 | 12篇 |
1973年 | 10篇 |
1972年 | 10篇 |
1971年 | 11篇 |
1970年 | 9篇 |
排序方式: 共有1569条查询结果,搜索用时 15 毫秒
1.
Anton A. Semenistyy Elena A. Litvina EA Anna G. Fedotova Chukwuweike Gwam Andrey N. Mironov 《Injury》2019,50(2):515-520
Background
Intramedullary nailing is considered a “gold standard” for treatment of tibial shaft fractures. However, some types of fractures are typically considered as “difficult for nailing”. This group includes the periarticular fractures, fractures of both bones at the same level, comminuted and segmental fractures of the tibia. Fixator-assisted nailing (FAN) is an effective method treatment of these types of fractures. The main requirements for the ideal reduction device are an ease of its installation and an ability of multiplanar fracture reduction. Fixator-assisted nailing (FAN) with the use of two perpendicular to each other monolateral tubular frames perfectly meets these requirements. In this study we present this new surgical technique and the analysis of first 30 cases.Methods
A prospective analysis was conducted for 30 patients with “difficult for nailing” tibial fractures treated with fixator-assisted nailing in our institution between September 1st, 2017, and March 1st, 2018. The duration of surgery and its different stages, the time of fluoroscopy, difficulties encountered during surgery, were analyzed. Clinical and radiological methods were used to evaluated reduction quality.Results
In all 30 cases the acceptable reduction was achieved. The mean duration of the surgical procedure was 73.7?±?3?min. The mean duration of fluoroscopy 85.9?±?4.8?s. In 7 cases we faced with technical difficulties, which were successfully addressed.Conclusion
The described technique of FAN is an effective method for the treatment of “difficult for nailing” tibial fractures. Future multi-centered studies with a larger number of patients are needed to validate our results. 相似文献2.
3.
Juvenile hypocalcemia provokes persistent electroencephalographic change in renally compromised rats
J J Lipman D L White P L Lawrence P E Teschan 《Journal of the American College of Nutrition》1988,7(6):453-460
In view of the putative involvement of calcium in uremic encephalopathy and the critical importance of this element in juvenile development, we examined the effect of temporary restriction of dietary calcium intake on serum chemistry and the quantitative electroencephalogram (Q.EEG) in unilaterally 3/4 nephrectomized juvenile male Sprague-Dawley rats. Animals were renally infarcted at 22-26 days of age (50-74 g) and placed on one of two isocaloric dietary regimens: powdered normal rat diet (ND, n = 25) or low calcium diet (LCD, n = 8) for 30 days. At this time, ND animals showed normal serum chemistries, whereas LCD rats were hypocalcemic and azotemic with significantly elevated blood urea nitrogen (BUN) and serum creatinine concentrations and reduced renal creatinine clearance values. All animals thereafter received ND for 25-34 further days, during which time chronic Q.EEG electrodes were implanted. At the end of the common ND feeding period, serum chemistry values were equal and normal in both groups. The average theta/alpha ratio (TAR) of the overnight Q.EEG was assessed for 3 days. We found that the TAR of previously LCD animals was significantly elevated compared with ND rats. This indicates an encephalopathic slowing of the background rhythm of these animals. We conclude that, following restoration of a transient uremic and hypocalcemic episode induced by LCD feeding, the Q.EEG background frequency of juvenile renally impaired rats was abnormally slow after 30 days of ND feeding. 相似文献
4.
5.
6.
7.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
8.
Studies of clinical populations suggest that adopted children are overrepresented among children using mental health facilities, whereas studies using non clinical populations of adopted children have reached mixed conclusions about whether or not there is an increased psychological risk associated with adoption. Data from the Ontario Child Health Study, a community survey of children aged four to 16 years, which included a subpopulation of adopted children, were used to: 1. profile the characteristics of adoptive families; 2. examine the strength of adoptive status as a marker for psychiatric and educational morbidity; and 3. determine the extent to which adoptive status has an independent relationship with psychiatric and educational morbidities. The findings were: 1. adoptive mothers were significantly older than non adoptive mothers, but otherwise adoptive families did not differ significantly from non adoptive families, 2. adoption in boys, but not in girls, was a significant marker for psychiatric disorder and poor school performance; adoption in adolescent girls was a significant marker for substance use; and 3. multivariate analyses demonstrated no independent effect of adoption on psychiatric disorder or poor school performance; for adolescents, adoptive status did have an independent relationship with substance use for girls. The implications of these findings will be discussed. 相似文献
9.
10.