Inhibition of fish oil oxidation and the radical scavenging activity of New Zealand seaweed extracts

This study describes the potential use of New Zealand seaweed extracts as antioxidants in fish oils. The extracts from two brown seaweeds (Ecklonia radiata, Macrocystis pyrifera) and two red species (Champia sp. and Porphyra sp.), were added to hoki (Macruronus novaezelandiae) oil and assessed by production of oxidation products in an elevated temperature (60 °C) storage trial. Antioxidant assays ORAC and DPPH were conducted to elucidate the radical scavenging activity of the seaweed extracts. The results showed that all the lipid-soluble seaweed extracts had some antioxidative capacity, with brown algae generally outperforming red algae species. Extracts from E. radiata performed best with significantly lower primary, secondary and total oxidation products, and higher DPPH radical scavenging ability than the commercial antioxidant, BHT. This study demonstrated the potential of brown algae seaweed extracts, in particular E. radiata, for use as antioxidants in fish oil products.     

Effects of feeding flaxseed or sunflower-seed in high-forage diets on beef production,quality and fatty acid composition

Yearling steers were fed 70:30 forage:concentrate diets for 205 d, with either grass hay (GH) or red clover silage (RC) as the forage source, and concentrates containing either sunflower-seed (SS) or flaxseed (FS), each providing 5.4% oil to diets. Feeding diets containing SS versus FS significantly improved growth and carcass attributes (P < 0.05), significantly reduced meat off-flavor intensity (P < 0.05), and significantly increased intramuscular proportions of vaccenic (t11-18:1), rumenic (c9,t11-CLA) and n − 6 fatty acids (FA, P < 0.05). Feeding diets containing FS versus SS produced significantly darker and redder meat with greater proportions of atypical dienes (P < 0.05). A significant forage × oilseed type interaction (P < 0.05) was found for n − 3 FA, α-linolenic acid, and conjugated linolenic acid, with their greatest intramuscular proportions found when feeding the RC-FS diet. Feeding GH versus RC also significantly improved growth and carcass attributes, sensory tenderness (P < 0.05) and significantly influenced intramuscular FA composition (P < 0.05), but overall, forage effects on FA profiles were limited compared to effects of oilseed.     

基于SFA 方法的建筑业技术效率评价及影响因素研究

合理评价建筑业技术效率及其影响因素对于促进建筑业持续健康发展至关重要。运用参数型随机前沿分析SFA 方法,以2001~2010 年中国建筑业的数据为基础,对中国建筑业技术效率省际差异及主要影响因素进行实证分析,发现我国建筑业技术效率的发展呈现出下降、上升、再下降的波浪式发展趋势,但总体呈现上升趋势;固定资产投资率、建筑业产业发达程度及动力装备率对建筑业技术效率具有显著的促进作用,但后两者效应不显著,而国有企业占比对建筑业技术效率具有负的效应,并对其产生原因进行了探讨。     

SFA252B型精梳机基于A201系列精梳机的技术升级实践

SFA252系列精梳机为A201D型的改进机型.文章阐述了改造过程中的主要技术关键,并将改造前后的生产测试结果进行了对比分析.     

基于SFA模型的河南省技术创新效率的实证研究

运用对数型柯布-道格拉斯生产函数的随机前沿生产函数（SFA）,实证研究了2005～2008年河南省区域技术创新效率。结果显示：科技活动人员投入比科技活动经费支出具有更高的产出弹性;从整体来看,河南省平均技术效率水平在近年中呈现出稳步上升趋势,但效率较低;同时,各地市之间区域技术创新效率差距明显。这表明如何提高河南省区域...