全文获取类型
收费全文 | 6831篇 |
免费 | 506篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 46篇 |
儿科学 | 170篇 |
妇产科学 | 206篇 |
基础医学 | 953篇 |
口腔科学 | 98篇 |
临床医学 | 597篇 |
内科学 | 1752篇 |
皮肤病学 | 177篇 |
神经病学 | 855篇 |
特种医学 | 257篇 |
外科学 | 559篇 |
综合类 | 11篇 |
预防医学 | 448篇 |
眼科学 | 52篇 |
药学 | 495篇 |
中国医学 | 15篇 |
肿瘤学 | 713篇 |
出版年
2024年 | 15篇 |
2023年 | 121篇 |
2022年 | 253篇 |
2021年 | 362篇 |
2020年 | 234篇 |
2019年 | 294篇 |
2018年 | 300篇 |
2017年 | 244篇 |
2016年 | 289篇 |
2015年 | 328篇 |
2014年 | 384篇 |
2013年 | 469篇 |
2012年 | 699篇 |
2011年 | 686篇 |
2010年 | 365篇 |
2009年 | 280篇 |
2008年 | 399篇 |
2007年 | 364篇 |
2006年 | 340篇 |
2005年 | 276篇 |
2004年 | 220篇 |
2003年 | 186篇 |
2002年 | 137篇 |
2001年 | 14篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 25篇 |
1997年 | 11篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 3篇 |
1993年 | 8篇 |
1992年 | 9篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1984年 | 3篇 |
1979年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1969年 | 2篇 |
1965年 | 1篇 |
1947年 | 1篇 |
1943年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
排序方式: 共有7404条查询结果,搜索用时 15 毫秒
101.
102.
Factors affecting difficult peripheral intravenous cannulation in adults: a prospective observational study
下载免费PDF全文
![点击此处可从《Journal of clinical nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
103.
104.
105.
106.
107.
Prognostic value of chromogranin A in chronic heart failure: data from the GISSI‐Heart Failure trial
108.
Edoardo Giannini Paola Ceppa Federica Botta Alberto Fasoli Paola Romagnoli Elena Cresta Valentina Venturino Domenico Risso Guido Celie Roberto Testa 《Liver international》1999,19(5):432-437
Abstract: Background/Aims: Hepatitis C virus (HCV) related disease follows a long, benign course and most affected patients have mild disease. Liver biopsy is mandatory to grade and stage the disease. Characteristic, though non-specific, HCV histological lesions such as bile duct damage and steatosis have been singled out but their association with non-histological parameters has not been completely defined. Our aim was to study the relationships among these histological lesions and clinical, biochemical, functional and virological characteristics in a group of Northern Italian patients with chronic hepatitis. Methods: We studied 172 patients with HCV-related chronic hepatitis. Patients were divided into groups on the basis of histology including bile duct damage and steatosis. Clinical, biochemical, functional and virological profiles were related to histological findings. Results: Histological grading and staging of disease increased as the age of patients increased. Steatosis was present in 70% of our patients and was related to a higher degree of fibrosis and to decreased functional activity. The prevalence of bile duct damage was 20%. This lesion was present in older patients with higher staging and impaired liver function. Biochemically it was associated with an increase in aspartate aminotransferase, gammaglutamyltranspeptidase, alkaline phosphatase, and total bilirubin. Conclusions: In the population we studied, HCV chronic hepatitis was predominantly a mild disease. Moreover both steatosis and bile duct damage were also mild. Steatosis was associated with fibrosis and this might influence liver metabolic function. Bile duct lesions were found in older patients with advanced disease showing biochemical evidence of cholestasis. The molecular role HCV might play in the pathogenesis of these histological features should be addressed in further studies. 相似文献
109.
Disruption of beta-catenin pathway or genomic instability define two distinct categories of liver cancer in transgenic mice 总被引:5,自引:0,他引:5
BACKGROUND & AIMS: Human liver cancer can be divided into 2 categories that are characterized by activation of beta-catenin and genomic instability. Here we investigate whether similar categories exist among 5 transgenic models of liver cancer, including c-myc, transforming growth factor-alpha, E2F-1, c-myc/transforming growth factor-alpha, and c-myc/E2F-1 mice. METHODS: The random amplified polymorphic DNA method was used to assess the overall genomic instability, and chromosomal loci affected by genomic alterations were determined by microsatellite analysis. beta-Catenin mutations and deletions were analyzed by polymerase chain reaction and sequencing screening. Cellular localization of beta-catenin and expression of alpha-fetoprotein, a prognostic marker of hepatocellular carcinoma, were investigated by immunohistochemistry. RESULTS: Liver tumors from the transgenic mice could be divided into 2 broad categories characterized by extensive genomic instability (exemplified by the c-myc/transforming growth factor-alpha mouse) and activation of beta-catenin (exemplified by the c-myc/E2F-1 mouse). The c-myc/transforming growth factor-alpha tumors displayed extensive genomic instability with recurrent loss of heterozygosity at chromosomes 1, 2, 4, 6, 7, 9, 12, 14, and X and a low rate of beta-catenin activation. The genomic instability was evident from the early dysplastic stage and occurred concomitantly with increased expression of alpha-fetoprotein. The c-myc/E2F-1 tumors were characterized by a high frequency of beta-catenin activation in the presence of a relatively stable genome and low alpha-fetoprotein levels. CONCLUSIONS: We have identified 2 prototype experimental models, i.e., c-myc/transforming growth factor-alpha and c-myc/E2F-1 mice, for the 2 categories of human hepatocellular carcinoma characterized by genomic instability and beta-catenin activation, respectively. These mouse models will assist in the elucidation of the molecular basis of human hepatocellular carcinoma. 相似文献
110.