全文获取类型
收费全文 | 1005篇 |
免费 | 65篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 32篇 |
妇产科学 | 17篇 |
基础医学 | 81篇 |
口腔科学 | 32篇 |
临床医学 | 84篇 |
内科学 | 139篇 |
皮肤病学 | 17篇 |
神经病学 | 87篇 |
特种医学 | 114篇 |
外科学 | 163篇 |
综合类 | 57篇 |
预防医学 | 93篇 |
眼科学 | 8篇 |
药学 | 62篇 |
肿瘤学 | 90篇 |
出版年
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 9篇 |
2018年 | 14篇 |
2017年 | 13篇 |
2016年 | 9篇 |
2015年 | 13篇 |
2014年 | 15篇 |
2013年 | 32篇 |
2012年 | 25篇 |
2011年 | 32篇 |
2010年 | 34篇 |
2009年 | 36篇 |
2008年 | 25篇 |
2007年 | 53篇 |
2006年 | 53篇 |
2005年 | 38篇 |
2004年 | 42篇 |
2003年 | 31篇 |
2002年 | 36篇 |
2001年 | 23篇 |
2000年 | 30篇 |
1999年 | 29篇 |
1998年 | 31篇 |
1997年 | 39篇 |
1996年 | 44篇 |
1995年 | 26篇 |
1994年 | 13篇 |
1993年 | 26篇 |
1992年 | 24篇 |
1991年 | 18篇 |
1990年 | 13篇 |
1989年 | 39篇 |
1988年 | 24篇 |
1987年 | 27篇 |
1986年 | 25篇 |
1985年 | 23篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1981年 | 8篇 |
1980年 | 14篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1969年 | 3篇 |
1961年 | 3篇 |
排序方式: 共有1091条查询结果,搜索用时 31 毫秒
1.
Coronary artery bypass grafts: visualization with MR imaging 总被引:1,自引:0,他引:1
2.
3.
Epithelial ovarian neoplasms of low malignant potential, also called borderline ovarian tumors, have various features of malignancy, but they do not invade the ovarian stroma. Women with these tumors usually are younger when diagnosed and have better prognoses than do women with invasive tumors. There have been few epidemiologic studies of borderline tumors, and it is unclear whether there are etiologic differences between the two types of tumor behavior. Combined data from nine case-control studies, conducted from 1974 to 1986 and representing 327 white women with tumors of low malignant potential and 4,144 white controls, were used to evaluate the relation between these tumors and personal characteristics related to invasive ovarian cancer. The risk profile for tumors of low malignant potential was found to be similar to that for invasive tumors, with two exceptions: Compared with that of invasive tumors, risk of borderline tumors was less clearly reduced among women who had used oral contraceptives and more clearly elevated among women with a history of infertility. 相似文献
4.
Magruder C. Donaldson MD Michael Belkin MD Anthony D. Whittemore MD John A. Mannick MD Janina A. Longtine MD David M. Dorfman MD PhD 《Journal of vascular surgery》1997,25(6):1054-1060
Purpose: The prevalence of activated protein C resistance (APCR) and associated thrombotic morbidity among patients who undergo arterial reconstruction were investigated.Methods: Preoperative assays for functional APCR and factor V (Leiden) mutation were performed on 262 patients who underwent arterial reconstructions that consisted of cerebrovascular surgery (109), aortic or iliofemoral procedures (76), or infrainguinal bypass procedures (77). Patients were monitored for thrombotic complications during the postoperative period.Results: Depending on the stringency of the definition used, functional APCR was detected in 10.6% to 22.0% of patients tested. Factor V (Leiden) was found in 5.3% of patients. Thrombotic morbidity consisting of myocardial infarction, cerebrovascular event, or graft thrombosis occurred in 9.9% of patients, who were followed-up for a mean of 4.8 months. No significant overall correlations were found between APCR and thrombotic morbidity. Subgroup analysis revealed significant associations between functional APCR and total early postoperative thrombotic complications and early graft failure, and between factor V (Leiden) and early cerebrovascular events and late graft thrombosis (p < 0.03).Conclusions: Functional APCR is somewhat more prevalent among general vascular surgical patients than in the general population, but factor V (Leiden) is no more prevalent. APCR is not a prominent cause of thrombotic morbidity in contemporary vascular surgery. Nonetheless, it is a sufficiently important potential contributor to morbidity among some subgroups to warrant selective testing and directed therapy pending further study. (J Vasc Surg 1997;25:1054-60.) 相似文献
5.
6.
7.
8.
Genotype-phenotype correlation for nucleotide substitutions in the IgII- IgIII linker of FGFR2 总被引:6,自引:3,他引:3
9.
10.