二氧化氯在葡萄保鲜中的应用研究

用壳聚糖作涂膜剂,ClO2作保鲜剂,研究了葡萄的保鲜效果。结果表明,能有效的控制葡萄的腐烂率和鲜重损失,保持感官品质,延长存放期。     

六种唇形科种子营养成分比较分析

对六种唇形科植物种子营养成分研究的结果表明：种子含有丰富的脂肪油,其不饱和脂肪酸总量均在90％以上。种子油的主要成分为：α-亚麻酸、亚油酸、油酸、花生烯酸、棕榈酸和硬脂酸等成分。并从种子中测定了18种氨基酸和多种矿质元素的含量。这六种种子和种子油具有较高的营养价值和潜在药用保健功效。     

Water loss and viability in Zizania (Poaceae) seeds during short-term desiccation

How Texas wild rice, Zizania texana, became isolated in the San Marcos River of Central Texas, hundreds of kilometres from other wild rice populations is not known. Zizania seeds are intolerant of short-term desiccation. Seeds desiccated at 14% relative humidity (RH) and 75% RH do not survive after only 5-6 d and 2-3 wk of drying. Water loss is rapid and reaches a maximum at the time of seed death due to drying. And although all Zizania seeds germinate well following a long, cold dormancy period, Z. texana seeds readily germinate in the isothermic water (22°C) of the San Marcos River and Springs without an obligate, cold dormant period. Within 30-60 d of collection, Z. texana seeds germinate in substantial numbers, unlike seeds of Z. palustris, which require a long, cold dormant period. The Texas population of Z. texana may represent a relict population of a once more widely dispersed wild rice population, since the San Marcos springs probably have never gone dry.     

基于MuSIASEM理论的大连经济技术开发区可持续发展评价

基于社会生态系统代谢多尺度综合评估（MuSIASEM）理论,对2000-2007年大连经济技术开发区人类活动时间、体外能投入量和增加值进行综合评价.结果表明：2000-2007年,大连开发区居民生活水平逐年提高;农业逐渐萎缩;第二产业仍为区域支柱产业,能耗较大;第三产业发展落后于第二产业;区域整体和各个产业的体外能代谢率明显提高,能源密度不断下降;人类活动时间与体外能投入量不断减少的情况下,经济增加值稳步增长,区域整体发展呈可持续态势.     

酿酒葡萄皮渣中白藜芦醇的抗氧化活性研究

本文利用甲醇溶剂对酿酒葡萄皮渣进行浸提,得到白藜芦醇粗提物.粗提物通过硅胶柱层析进行纯化.然后,研究了白藜芦醇的氧自由基、超氧阴离子自由基、羟自由基、DPPH自由基的清除能力.结果显示:白藜芦醇具有很强的自由基清除能力和抗氧化能力,并且随着浓度的增加,抗氧化能力增强.     

磁化水浸种对西瓜种子萌发及幼苗生理的影响

用不同强度的磁化水(0．05T、0．08T、0．10T、0．15T)浸种西瓜种子研究磁化水对西瓜种子萌发及幼苗生理的影响,结果表明：与对照相比,各种强度磁化水浸种都能提高种子的发芽率、发芽势、发芽指数和幼苗的抗坏血酸含量,其中0．10T磁化水处理后西瓜种子发芽率、发芽势提高幅度最大;对抗坏血酸含量的影响以0．08T处理最明显;经过不同强度磁化水处理后幼苗中的过氧化物酶同工酶酶、酯酶同工酶活性得到不同强度的增强,不同品种表现不同。实验结果说明磁化水处理后能明显提高西瓜种子的萌发能力,并能提高幼苗的各种生理活性。     

Isolation of a Thiamine-binding Protein from Rice Germ and Distribution of Similar Proteins

A thiamine-binding protein was purified from rice germ (Oryza sativa L.) by extraction, salting-out with ammonium sulfate, and column chromatography. From the results of molecular mass, K_d and B_max values for thiamine-binding, binding specificity for thiamine phosphates and analog, the protein was suggested to be identical to the thiamine-binding protein in rice bran. The thiamine-binding protein w as more efficiently purified from rice germ than from rice bran. The protein was rich in glutamic acid (and/or glutamine) and glycine. The protein did not show immunological similarity to thiamine-binding proteins in buckwheat and sesame seeds. However proteins similar to the thiamine-binding protein from rice germ existed in gramineous seeds. They were suggested to have thiamine-binding activity and to be of the same molecular mass as the thiamine-binding protein.     

Mobilisation of the major stored reserves in the embryo of fenugreek (Trigonella foenum-graecum L., Leguminosae), and correlated enzyme activities

Changes in total nitrogen, soluble amino nitrogen, lipid and phytate contents, and in the activities of proteinase (pH 7.0), isocitrate lyase and phytase were followed in the endosperm, cotyledons, and axis during germination of fenugreek seeds and subsequent growth of the seedlings. The endosperm is comprised largely of cell-wall galactomannans: the majority of the seed total nitrogen, lipid and phytate (5%, 8%, 0.44% of seed dry weight respectively) is localised within the cotyledons as stored reserves. Germination is completed after 10–14 h from the start of imbibition, but the major reserves are not mobilised during the first 24 h. Then the total nitrogen content of the cotyledons starts to decrease and that of the axis increases; there is a concomitant accumulation of soluble amino nitrogen in both cotyledons and axis. An increase in proteinase activity in the cotyledons correlates well with the depletion of total nitrogen therein. Depletion of lipid and phytate reserves in the different seed tissues constitutes a late event, occurring after 50 h from the start of imbibition, and is coincident with the final disintegration of the endosperm tissue. The depletion of phytate and stored lipids is accompanied by an increase in phytase and isocitrate lyase activity. It appears that the products of lipid hydrolysis are converted by gluconeogenesis to serve as the major source of sugars for the growing axis after the endosperm galactomannan has been completely mobilised.