Aziz N H, el-Fouly M Z, Abu-Shady M R, Moussa L A
National Center for Radiation Research and Technology, Nasr City, Cairo, Egypt.
Appl Radiat Isot. 1997 Jan;48(1):71-6. doi: 10.1016/s0969-8043(96)00058-9.
This study evaluates the effect of gamma radiation on the viability of fungi and actinomycetes that contaminate medicinal plants. The relationship between the total lipids of some fungi and actinomycetes and their sensitivity to gamma radiation is also investigated. The date reveal that the viable counts of these florae decrease approximately exponentially with the radiation dose, the effective dose for the elimination of these microorganisms being about 5 kGy for all the medicinal plants under study. Response of pure cultures of fungi and actinomycetes isolated from medicinal plants to increasing absorbed doses of gamma radiation indicate that an increase in radioresistance is in the following order: Streptomyces rimosus, Fusarium solani, Nocardia kuroishii. F. oxysporum, A. fumigatus, A. flavus, A. parasiticus and A. ochraceus. The total lipid contents of molds and actinomycetes have been reported to be increased by increasing the radio-resistance of microorganisms, and hence there is a relationship between the radio-sensitivity of microorganisms and the total lipid mass of flora mycelia.
本研究评估了γ辐射对污染药用植物的真菌和放线菌生存能力的影响。还研究了一些真菌和放线菌的总脂质与其对γ辐射敏感性之间的关系。数据显示，这些菌群的活菌数随辐射剂量大致呈指数下降，对于所有所研究的药用植物，消除这些微生物的有效剂量约为5千戈瑞。从药用植物中分离出的真菌和放线菌纯培养物对不断增加的γ辐射吸收剂量的反应表明，抗辐射能力增加的顺序如下：龟裂链霉菌、茄病镰刀菌、黑色诺卡氏菌、尖孢镰刀菌、烟曲霉、黄曲霉、寄生曲霉和赭曲霉。据报道，霉菌和放线菌的总脂质含量会随着微生物抗辐射能力的增强而增加，因此微生物的辐射敏感性与菌群菌丝体的总脂质质量之间存在关联。
