LX-001B汽油抗氧防胶剂的评价与工业应用

进行了提高催化裂化汽油诱导期的实验和工业应用。结果表明，LX-001B液体抗氧剂有良好的抗氧性能和防胶性能，汽油诱导期合格率达到98％以上，且油溶性好，使用方便。     

青刺果抗菌肽组分的分离及其稳定性分析

旨在高值化利用青刺果榨油后副产物青刺果粕中的蛋白质，以青刺果粕为原料，提取青刺果蛋白并制备蛋白酶解物，采用活菌吸附法联合反相高效液相色谱（RP-HPLC）从蛋白酶解物中筛选出抗菌肽组分，评价其抑菌活性，并对抑菌活性最好的组分进行稳定性分析。结果表明：筛选出的3个抗菌肽组分（F1、F2和F3）中，F2组分抑菌活性最好，当其质量浓度为10 mg/mL时对金黄色葡萄球菌和大肠杆菌的抑菌活性分别达到45.5%和39.1%；抗菌肽组分F2抑菌活性随温度升高和盐溶液浓度增加均降低，最适pH为6.0，在酸性环境中极不稳定，对酸性蛋白酶、碱性蛋白酶、胃蛋白酶和胰蛋白酶的耐受性均较差，对中性蛋白酶耐受性较好。综上，青刺果粕中的蛋白酶解物具有抑菌活性，具有开发青刺果抗菌肽的潜力。     

人参三醇组甙对雄性大鼠阿片肽与免疫功能的辐射防护作用

采用５ＧｙＸ射线全身照射雄性大鼠模型，大鼠于照射前２４ｈ及照射后，每天腹腔注射５ｍｇ／０．２ｍｌ人参三醇组甙，共注射１４ｄ，观察人参三醇组甙对其阿片肽与免疫功能的辐射防护作用。结果表明，照射组下丘脑阿片肽含量及胸腺和脾脏免疫参数均降低；而在照射加人参组下丘脑阿片肽组水平，所有的免疫参数虽降低但却高于照射组。结果提示，人参三醇组甙可减轻下丘脑网片肽含量及含量接近对照胸腺和脾脏免疫参数的降低，具有辐射防护作用。     

Structural Versatility of Homo-peptides from Cα,α-dialkylated Glycines

A theoretical and experimental analysis of the preferred conformations of homo-peptides from Cα,α-dialkylated glycines revealed that these compounds are characterised by a marked structural versatility. Fully extended (C₅-conformations). folded (of theβ-bend type), and 3₁₀-helical structures are adopted as a function of side-chain nature. Dimethylated and cyclic side chains favour folded and helical structures, whereas diethylated and longer acyclic side chains favour the fully extended structure. By means of conformational energy calculations the preferred screw sense of the helical structure of homo-peptides from a representative chiral acyclic residue is also anticipated.     

含稀土抗氧化剂的热浸镀铝工艺研究

在热浸镀铝液中添加了含稀土铈的抗氧化剂后，铝液表面无需覆盖熔剂，降低了成本，净化了铝液，使镀件表面平整，光亮且无杂色斑，提高了镀层抗氧化性能。     

Effect of slowly and rapidly degraded protein sources on the concentrations of amino acids and peptides in the rumen of steers

Four steers were given diets of straw and tapioca supplemented with urea, casein, formaldehyde treated casein (FTC), decorticated groundnut meal (DCGM), soya bean meal (SBM), maize gluten meal (MGM) or fish meal (FM) to determine the effect of degradability on rumen amino acid and peptide concentrations. Maximum concentrations of amino acid and peptide-N in rumen ultrafiltrates occurred 1 h after feeding. Total amino acid-N concentrations (mg litre^?1) at this time were low, ranging from 1.2 SE 0.8 (urea) to 15.6 SE 6.0 (casein) with little variation in individual amino acids. The peptide-N concentrations (mg litre^?1) were higher, ranging from 2.4 SE 0.5 (urea) to 160.0 SE 21.0 (casein), but were poorly correlated with degradability and solubility. Apart from casein, the highest concentrations of peptide-N were for those protein supplements, MGM (136.0 SE 25.0), FM (90.0 SE 15.0), and FTC (87.0 SE 14.0), with the lowest degradability suggesting that other factors, such as hydrophobicity, are also involved in the control of rumen peptide concentrations. Pooled samples taken 1 h after the morning feed were separated into three molecular weight (MW) fractions, 5000–50 000 da, 250–5000 da and < 250 da by gel filtration chromatography. From amino acid analysis it was found that the highest proportion of peptide-N was in the 250–5000 da fraction, and although some high MW (5000–50 000) constituents were present, only the FTC and MGM diets gave rise to significant amounts.     

抗氧剂双(3,5-二叔丁基-4-羟基苄基膦酸单乙酯)钙盐的合成

报道了由国产 2 ,6二叔丁基苯酚与多聚甲醛、亚磷酸三乙酯、水合氢氧化钠和氯化钙等经 4步反应合成了抗氧剂双 ( 3,5二叔丁基 4羟基苄基膦酸单乙酯 )钙盐。通过核磁、红外和元素分析证实了各步产物的结构。     

Biosynthetic regulation of phytochelatins, heavy metal-binding peptides

Phytochelatins (PCs) are heavy metal-binding peptides that play important roles in the detoxification of toxic heavy metals and the regulation of intracellular concentrations of essential metals in eukaryotes, including higher plants, fungi, and microalgae. Recently, PC synthase genes in higher plants and fission yeast have been identified and characterized, enabling molecular biological studies to unravel the mechanisms underlying PC synthesis. Moreover, recent routine database searches have unexpectedly identified genes that are similar to plant PC synthase genes in the genomes of worms and some prokaryotes. In this review, we introduce these recent advances in our understanding of the molecular mechanisms for PC biosynthesis and functions in order to supply basic information about the unique and attractive peptides applicable to various fields.     

Comparison of Antifungal and Antioxidant Activities of <Emphasis Type="Italic">Acacia mangium</Emphasis> and <Emphasis Type="Italic">A. auriculiformis</Emphasis> Heartwood Extracts

The effect of heartwood extracts from Acacia mangium (heartrot-susceptible) and A. auriculiformis (heartrot-resistant) was examined on the growth of wood rotting fungi with in vitro assays. A. auriculiformis heartwood extracts had higher antifungal activity than A. mangium. The compounds 3,4,7,8-tetrahydroxyflavanone and teracacidin (the most abundant flavonoids in both species) showed antifungal activity. A. auriculiformis contained higher levels of these flavonoids (3.5- and 43-fold higher, respectively) than A. mangium. This suggests that higher levels of these compounds may contribute to heartrot resistance. Furthermore, both flavonoids had strong 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and laccase inhibition. This suggests that the antifungal mechanism of these compounds may involve inhibition of fungal growth by quenching of free radicals produced by the extracellular fungal enzyme laccase.