全文获取类型
收费全文 | 964篇 |
免费 | 78篇 |
国内免费 | 1篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 33篇 |
妇产科学 | 10篇 |
基础医学 | 149篇 |
口腔科学 | 7篇 |
临床医学 | 55篇 |
内科学 | 386篇 |
皮肤病学 | 10篇 |
神经病学 | 26篇 |
特种医学 | 132篇 |
外科学 | 72篇 |
综合类 | 12篇 |
预防医学 | 74篇 |
眼科学 | 12篇 |
药学 | 39篇 |
1篇 | |
肿瘤学 | 21篇 |
出版年
2022年 | 5篇 |
2021年 | 11篇 |
2020年 | 4篇 |
2019年 | 7篇 |
2018年 | 12篇 |
2017年 | 6篇 |
2016年 | 16篇 |
2015年 | 21篇 |
2014年 | 24篇 |
2013年 | 32篇 |
2012年 | 57篇 |
2011年 | 44篇 |
2010年 | 26篇 |
2009年 | 26篇 |
2008年 | 32篇 |
2007年 | 33篇 |
2006年 | 39篇 |
2005年 | 51篇 |
2004年 | 28篇 |
2003年 | 28篇 |
2002年 | 31篇 |
2001年 | 34篇 |
2000年 | 22篇 |
1999年 | 32篇 |
1998年 | 25篇 |
1997年 | 33篇 |
1996年 | 29篇 |
1995年 | 24篇 |
1994年 | 19篇 |
1993年 | 24篇 |
1992年 | 18篇 |
1991年 | 15篇 |
1990年 | 12篇 |
1989年 | 15篇 |
1988年 | 26篇 |
1987年 | 23篇 |
1986年 | 18篇 |
1985年 | 14篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 10篇 |
1979年 | 5篇 |
1978年 | 8篇 |
1967年 | 4篇 |
1959年 | 4篇 |
1958年 | 4篇 |
1956年 | 4篇 |
1926年 | 5篇 |
1925年 | 23篇 |
排序方式: 共有1043条查询结果,搜索用时 15 毫秒
1.
Donor interleukin-4 promoter gene polymorphism influences allograft rejection after heart transplantation. 总被引:3,自引:0,他引:3
Femke J Bijlsma Joyce vanKuik Marcel G J Tilanus Nicolaas deJonge Erik H Rozemuller Jan G van den Tweel Frits H J Gmelig-Meyling Roel A deWeger 《The Journal of heart and lung transplantation》2002,21(3):340-346
BACKGROUND: The cytokine interleukin-4 (IL-4) is secreted mainly by activated T lymphocytes and characterizes the T-helper 2 (Th2) sub-type. In transplantation Th2 cells are believed to induce graft tolerance. Previous studies revealed that patients with a relatively high frequency of IL-4 producing helper T lymphocytes (HTL) before heart transplantation (HTX) had no or less rejection episodes compared with patients with a low frequency of IL-4 producing HTL. Three single nucleotide polymorphisms (SNPs) have been identified in the promoter region of the IL-4 gene, which influence promoter strength. We investigated whether there was a correlation between SNP genotypes in the IL-4 promoter and heart failure, and rejection after HTX. METHODS: Seventy HTX patients, 61 donors, and 36 controls were genotyped for the 3 SNPs by sequencing. RESULTS: Of the SNPs at -285 and -81, only the C and A alleles, respectively, were found in this study. Both alleles were found for the -590 SNP. No relation between patient genotype of the SNP at -590 and heart failure and rejection was found. However, incidence of rejection was significantly lower in patients that received a donor heart with the T-positive genotype compared with patients that received a heart from a T-negative donor. Patients who had the T-negative genotype and received a heart from a T-positive donor, suffered significantly less from rejection than T-negative patients that received a T-negative donor heart. This was not significant in the T-positive patient group. CONCLUSIONS: This indicates that IL-4 production within the donor heart and by cells from the donor is important for reducing incidence of episodes of rejection. 相似文献
2.
3.
4.
The 3-M syndrome is a clinically recognizable disorder characterized by prenatal and postnatal growth retardation and a spectrum of consistent minor anomalies. Intelligence seems normal. Inheritance is probably autosomal recessive, with possible expression of the mutant gene in the heterozygote. Three sibs with the 3-M syndrome are reported, together with an extensive review of the pertinent literature. 相似文献
5.
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
6.
7.
8.
9.