Measurement of β-1,3 Glucanase Activity in Permeabilized Discs of Leaves of Healthy and Scald-Diseased Plants

Leaf discs of five cultivars of sugarcane exhibiting different degree of susceptibility to leaf scald were used to measure β-1,3 glucanase activity before and after experimental infection with Xanthomonas albilineans. Leaf discs were permeabilized with iso-propanol to facilitate the uptake of the enzyme substrate by intact tissues and to improve the enzyme assay. Bacterial infection significantly enhances β-1,3 glucanase activity of sensitive cultivars whereas significantly decreased that of the resistant one. Low concentrations of salicylate increase the hydrolase activity whereas jasmonic acid do not act as an elicitor of the enzyme and β-1,3 glucanase, such as laminarin, significantly inhibits the production of β-1,3 glucanase. Thus, the enzyme must be considered as a sensitivity factor induced by the pathogen.

碱性成纤维细胞生长调节因子对家兔实验性深Ⅱ度烫伤的治疗作用

为了探讨碱性成纤维细胞生长调节因子(bFGF)对家兔实验性深Ⅱ度烫伤的治疗作用。治疗组采用bFGF 10μg/ml、3μg/ml、1μg/ml的3种浓度;对照组采用溶媒、磺胺嘧啶银盐、生理盐水。观察bFGF对家兔被80℃循环水所致深Ⅱ度烫伤的促愈合作用。结果表明,3种不同浓度的bFGF对家兔深Ⅱ度烫伤均具有促进烫区表面干燥,结痂和脱痂的作用。t检验的结果表明,在缩小痂皮面积方面各治疗组于涂药前后不同时点的对比,差并非常显著(P<0.01),但各对照组仅在第25天开始差异显著或非常显著(P<0.05或P<0.01);而痂皮脱落时间与各对照组相比10μg/ml组差异显著(P<0.05),3μg/ml、1μg/ml组脱痂时间除与生理盐水组相比未显示统计学意义外,其余均具有统计学显著性(P<0.05)。

白羽肉鸡屠宰加工工艺研究进展

中国白羽肉鸡屠宰加工工艺经过近三十年的发展,已经形成较为成熟的体系,部分关键工序对提高车间的内部加工能力、提高产品质量、控制微生物以及降低成本提高效益等有着重要作用。重点介绍了白羽肉鸡屠宰中宰前致晕、浸烫脱毛、胴体预冷、肉鸡分割、产品速冻等五个关键工序的研究进展及应用动态,旨在为白羽肉鸡屠宰企业的发展提供一定的参考。