全文获取类型
收费全文 | 8860篇 |
免费 | 546篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 37篇 |
儿科学 | 174篇 |
妇产科学 | 95篇 |
基础医学 | 931篇 |
口腔科学 | 115篇 |
临床医学 | 969篇 |
内科学 | 2286篇 |
皮肤病学 | 150篇 |
神经病学 | 473篇 |
特种医学 | 227篇 |
外国民族医学 | 1篇 |
外科学 | 1629篇 |
综合类 | 234篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 553篇 |
眼科学 | 161篇 |
药学 | 822篇 |
中国医学 | 158篇 |
肿瘤学 | 454篇 |
出版年
2024年 | 17篇 |
2023年 | 182篇 |
2022年 | 546篇 |
2021年 | 702篇 |
2020年 | 414篇 |
2019年 | 504篇 |
2018年 | 510篇 |
2017年 | 309篇 |
2016年 | 332篇 |
2015年 | 360篇 |
2014年 | 437篇 |
2013年 | 516篇 |
2012年 | 777篇 |
2011年 | 712篇 |
2010年 | 342篇 |
2009年 | 310篇 |
2008年 | 461篇 |
2007年 | 444篇 |
2006年 | 365篇 |
2005年 | 339篇 |
2004年 | 254篇 |
2003年 | 240篇 |
2002年 | 112篇 |
2001年 | 46篇 |
2000年 | 34篇 |
1999年 | 23篇 |
1998年 | 22篇 |
1997年 | 8篇 |
1996年 | 14篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 13篇 |
1991年 | 9篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 12篇 |
1980年 | 4篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1972年 | 3篇 |
1969年 | 3篇 |
排序方式: 共有9475条查询结果,搜索用时 0 毫秒
71.
72.
Muhammad S. Sajid MBBS MSc MBA FRCS Kristian Hutson MBBS MRCS Lorain Kalra MBBS MRCS Riccardo Bonomi MBBS FRCS 《Journal of surgical oncology》2012,106(6):783-795
A systematic review of randomised, controlled trials investigating the effectiveness of fibrin glue (FG) in reducing the postoperative seroma and seroma related morbidities following breast and axillary surgery was conducted. FG failed to influence the incidence of postoperative seroma, average volume of seroma, wound infection, complications and length of hospital stay in patients undergoing breast cancer surgery. However, a major multicentre and high quality randomised, controlled trial is required to validate these findings. J. Surg. Oncol. 2012; 106:783–795. © 2012 Wiley Periodicals, Inc. 相似文献
73.
A. Ismail S.K. Idris A.M. Tabari H. Ismail S. Ali M. Usman 《European Journal of Vascular and Endovascular Surgery Extra》2012,23(2):e16-e17
IntroductionSturge Weber syndrome is a neurocutaneous disorder, characterised by vascular malformation with capillary venous angiomas. Though it presents with vascular anomalies, association with vein of Galen aneurysmal malformation is rare.ReportA 2-year-old girl presented with delayed developmental milestones, head enlargement and convulsions. Examination revealed an ill-looking child with head enlargement, hypotonia and bilateral blindness. Computed tomographic angiography revealed gyriform cerebral calcifications with vein of Galen aneurysmal dilatation, showing multiple feeding arteries. Findings were also corroborated by ultrasound.DiscussionThis experience underscores the value of imaging in revealing this complex angio-architecture, which is necessary in the diagnosis and management. 相似文献
74.
75.
76.
77.
Muhammad Arif 《Journal of medical systems》2012,36(3):1173-1181
In pattern classification problems, feature extraction is an important step. Quality of features in discriminating different classes plays an important role in pattern classification problems. In real life, pattern classification may require high dimensional feature space and it is impossible to visualize the feature space if the dimension of feature space is greater than four. In this paper, we have proposed a Similarity-Dissimilarity plot which can project high dimensional space to a two dimensional space while retaining important characteristics required to assess the discrimination quality of the features. Similarity-dissimilarity plot can reveal information about the amount of overlap of features of different classes. Separable data points of different classes will also be visible on the plot which can be classified correctly using appropriate classifier. Hence, approximate classification accuracy can be predicted. Moreover, it is possible to know about whom class the misclassified data points will be confused by the classifier. Outlier data points can also be located on the similarity-dissimilarity plot. Various examples of synthetic data are used to highlight important characteristics of the proposed plot. Some real life examples from biomedical data are also used for the analysis. The proposed plot is independent of number of dimensions of the feature space. 相似文献
78.
Julie Mahata Maria Argos Wendy Verret Muhammad G. Kibriya Regina M. Santella Habibul Ahsan 《Nutrition and cancer》2013,65(1):55-60
An estimated 35 million people in Bangladesh have been chronically exposed to arsenic in drinking water and are at risk of an array of adverse health conditions. The mechanisms of arsenic toxicity have not been well established; however, oxidative stress has been one commonly proposed pathway. In this study, we evaluated the effect of antioxidant supplementation on plasma protein oxidation among patients with arsenical skin lesions participating in a randomized double-blinded placebo-controlled trial of vitamin E and selenium. Subjects were randomized to 1 of 4 treatments arms (vitamin E, selenium, combination, or placebo) and were treated for a 6-mo period. We observed a dose-dependent increase in adjusted protein carbonyl levels by arsenic exposure status in the pretreatment samples, although trends were not statistically significant. Following the 6-mo intervention, there was a decrease in protein carbonyl levels in each treatment group, although no resultant decrease was significantly different from that seen in the placebo group. Although we did not see a notable effect of selenium or vitamin E supplementation on changes in protein carbonyl levels, these preliminary data demonstrate a feasible methodological approach for the assessment of plasma protein carbonyls in relation to environmental toxicants in a human population and their potential use as endpoints in intervention trials. 相似文献
79.
Harmin Sulistiyaning Titah Siti Rozaimah Sheikh Abdullah Idris Mushrifah Nurina Anuar Hassan Basri Muhammad Mukhlisin 《Bulletin of environmental contamination and toxicology》2013,90(6):714-719
Wilting, especially of the leaves, was observed as an initial symptom of arsenate [As(V)] to Ludwigia octovalvis (Jacq.) P. H. Raven. The plants tolerated As(V) levels of 39 mg kg?1 for as long as 35 days of exposure. After 91 days, the maximum concentration of As uptake in the plant occurred at As(V) concentration of 65 mg kg?1 while As concentration in the stems, roots and leaves were 6139.9 ± 829.5, 1284.5 ± 242.9 and 1126.1 ± 117.2 mg kg?1, respectively. In conclusion, As(V) could cause toxic effects in L. octovalvis and the plants could uptake and accumulate As in plant tissues. 相似文献