全文获取类型
收费全文 | 749篇 |
免费 | 67篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 17篇 |
妇产科学 | 10篇 |
基础医学 | 91篇 |
口腔科学 | 43篇 |
临床医学 | 105篇 |
内科学 | 169篇 |
皮肤病学 | 3篇 |
神经病学 | 16篇 |
特种医学 | 94篇 |
外科学 | 89篇 |
综合类 | 27篇 |
预防医学 | 70篇 |
眼科学 | 5篇 |
药学 | 61篇 |
中国医学 | 1篇 |
肿瘤学 | 23篇 |
出版年
2023年 | 4篇 |
2022年 | 4篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 15篇 |
2015年 | 7篇 |
2014年 | 16篇 |
2013年 | 23篇 |
2012年 | 20篇 |
2011年 | 16篇 |
2010年 | 28篇 |
2009年 | 35篇 |
2008年 | 16篇 |
2007年 | 36篇 |
2006年 | 27篇 |
2005年 | 23篇 |
2004年 | 19篇 |
2003年 | 19篇 |
2002年 | 11篇 |
2001年 | 15篇 |
2000年 | 18篇 |
1999年 | 12篇 |
1998年 | 37篇 |
1997年 | 40篇 |
1996年 | 32篇 |
1995年 | 31篇 |
1994年 | 23篇 |
1993年 | 28篇 |
1992年 | 26篇 |
1991年 | 16篇 |
1990年 | 23篇 |
1989年 | 23篇 |
1988年 | 29篇 |
1987年 | 22篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1974年 | 4篇 |
1970年 | 6篇 |
1969年 | 4篇 |
1965年 | 3篇 |
排序方式: 共有828条查询结果,搜索用时 812 毫秒
1.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
2.
3.
4.
J Colquhoun 《The New Zealand medical journal》1990,103(896):408-409
5.
6.
M Hettiarachchi E Q Colquhoun J M Ye S Rattigan M G Clark 《International journal of obesity (2005)》1991,15(1):37-43
d,l-Norephedrine (phenylpropanolamine) which is both a demethylated analogue and a metabolite of d,l-ephedrine, is a reputed anorectic agent. In the present study the proposed most active isomer of this mixture, l-norephedrine has been assessed as a peripherally acting thermogenic agent in the isolated perfused rat hindlimb. l-Norephedrine produced a dose-dependent increase in oxygen uptake and perfusion pressure and increased lactate production. Whereas propranolol potentiated the increase in oxygen uptake and perfusion pressure produced by l-norephedrine, prazosin significantly and nitroprusside totally inhibited both of these changes. Nitroprusside also completely inhibited the increase in lactate production. We conclude that norephedrine has a hitherto unrecognized peripheral thermogenic activity in the perfused rat hindlimb resulting from its interaction with alpha 1 adrenergic receptors that control vasoconstriction in this tissue. 相似文献
7.
8.
9.
R G Hughes N G Haddad G E Smart M Colquhoun E McGoogan C C MacIntyre R J Prescott 《British journal of obstetrics and gynaecology》1992,99(6):498-502
OBJECTIVE: To determine whether the cytological detection of persistent cervical intraepithelial neoplasia (CIN) after local ablative treatment is improved by the use of sampling devices other than the Ayre's spatula. DESIGN: A randomized controlled study. SETTING: Lothian Area Colposcopy Clinic. SUBJECTS: 856 patients who had received local therapy (CO2 laser or cold coagulation) for CIN II or III between 9 and 30 months earlier. INTERVENTION: Each patient had three consecutive cervical smears taken, one with the Ayre's spatula, one with either the Aylesbury, the Rocket or the Multispatula device, and finally one with the Cytobrush. The allocation of which spatula and the order of the first two was randomized. Each patient had a colposcopic examination immediately after the smears were taken. MAIN OUTCOME MEASURES: A comparison of the detection of histologically proven persistent CIN by the Ayre's spatula with the detection of persistent disease by alternative sampling devices. RESULTS: Of the 856 patients 130 had histologically proven persistent CIN. Another 98 had suspicious findings on colposcopy but punch biopsies reported as histologically normal. Of the remaining patients with normal colposcopy 130 were randomly selected to form a control group. The cervical smears from these 358 women were reported. Significantly fewer Ayre's samples contained endocervical cells than Aylesbury samples (47% vs 59%, difference 12%; 95% CI 3%-21%; P less than 0.001), Rocket samples (47% vs 67%; difference 20%, 95% CI; 12%-32%; P less than 0.001) or Multispatula samples (47% vs 76%; difference 29%, 95% CI 19-38%; P less than 0.001). When punch biopsies contained CIN, dyskaryotic cells were seen in 10% of Ayre's samples, 4.3% of Aylesbury samples, 8.3% of Rocket samples, and in no smear taken with the Multispatula. Obtaining a third smear with the Cytobrush did not substantially improve the detection rate of dyskaryosis. Neither the order of use of the spatulas, the form of initial treatment nor the size of the transformation zone had any apparent effect on the cytological detection of persistent CIN. CONCLUSIONS: We recommend that surveillance of patients who have received local ablative therapy for CIN should be by both cytology and colposcopy, and that cytological samples should be obtained using the Ayre's spatula. 相似文献
10.
OBJECTIVE: The authors assessed the prevalence and clinical significance of the celiac compression syndrome in liver transplantation patients. SUMMARY BACKGROUND DATA: Compression of the celiac axis by the median arcuate ligament of the diaphragm, causes a decrease in celiac artery blood flow which may lead to hepatic artery thrombosis in patients undergoing orthotopic liver transplantation. METHODS: From July 1991 to July 1992, 17 (10%) cases of celiac compression syndrome were identified among 164 consecutive adult patients who underwent liver transplantation. The diagnosis was confirmed by blood flow recording demonstrating a typical pattern of accentuated decrease in celiac blood flow during expiration. RESULTS: Surgical transection of the median arcuate ligament resulted in normalization of the hepatic artery blood flow. In two cases (11.7%), an interposition iliac graft from the recipient supra-celiac aorta was used for the arterial reconstruction. During the follow-up period of up to 15 months, there was no incidence of hepatic artery thrombosis. CONCLUSIONS: The clinical significance of the celiac compression syndrome is evident in liver transplantation in which the collateral circulation to the liver is compromised and the celiac artery remains the only source of arterial blood. It is imperative to identify and remove the obstruction of the celiac axis to prevent severe complications and potential graft loss. 相似文献