Fluid-structure thermal simulation of gasoline engine manifold catalytic converter

片球菌素是一类未修饰的具有良好热稳定性的小分子蛋白质,其理化性质稳定,抑菌谱较广,能抑制多种革兰氏阳性菌,尤其对单核细胞增多症李氏杆菌的抑制作用最为显著。本文综述了近年来片球菌素在食品防腐保鲜应用方面取得的研究进展,分析了其作为天然食品防腐剂的发展前景,同时就片球菌素当前产业化开发与市场应用所面临的问题进行了深入探讨。     

Biopreservative effect of pediocin ACCEL on refrigerated seafood

To investigate the biopreservative effectiveness of pediocin ACCEL on refrigerated seafoods, fresh fish fillets were immersed in various concentrations of pediocin ACCEL and then stored at either 4° or 0°C. Samples treated with nisin were used as a positive control. The aerobic plate counts (APC) of samples with bacteriocins were <2.0 log₁₀cfu/g (log cfu/g) after 2 days storage at 0°C, except that with 1500 IU/mL of pediocin ACCEL. The APC of samples with nisin were >2.0 log cfu/g after 2 days storage, while those with pediocin ACCEL occurred after 1 day storage at 4°C. In refrigerated seafoods, pediocin ACCEL and nisin suppressed the growth of inoculated Listeria monocytogenes during 2- and 1-week storage at 4°C, respectively. Compared with nisin, the pediocin ACCEL was considered to be more effective on the suppression of L. monocytogenes growth in refrigerated seafoods during 2-week storage at 4°C.