School of Nursing, Anhui Sanlian University, Hefei, 230601, PR China.
Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, PR China; Jianghuai College, Anhui University, Hefei, 230039, PR China.
J Environ Radioact. 2018 Oct;193-194:75-81. doi: 10.1016/j.jenvrad.2018.09.005. Epub 2018 Sep 12.
Radionuclides-resistant filamentous fungi were isolated from radionuclides' contaminated soils. Effects of contact time, mycelia dosage, pH, ionic strength and thiol compounds on Eu(III) accumulation on two kinds of filamentous fungi (Aspergillus sydowii and Trichoderma harzianum, denoted as A. sydowii and T. harzianum, respectively) were investigated by batch techniques. The maximum tolerance to Eu(III) concentration of A. sydowii and T. harzianum reached 3000 mg/L and 3500 mg/L, and the Eu(III) accumulation on A. sydowii and T. harzianum can be fitted better with the pseudo-second-order kinetic model, respectively. Filamentous fungi were characterized by FT-IR and acid base titrations, and morphological structures of mycelia changed obviously under Eu(III) stress by SEM and TEM analysis. The results suggested that filamentous fungi could play an important role in the migration and transformation of radionuclides in the environment.
从放射性核素污染的土壤中分离出抗放射性核素的丝状真菌。采用批量技术研究了接触时间、菌丝剂量、pH 值、离子强度和巯基化合物对两种丝状真菌（被命名为 Aspergillus sydowii 和 Trichoderma harzianum 的 Aspergillus sydowii 和 T. harzianum）上 Eu(III)积累的影响。A. sydowii 和 T. harzianum 对 Eu(III)浓度的最大耐受度分别达到 3000 mg/L 和 3500 mg/L，且 Eu(III)在 A. sydowii 和 T. harzianum 上的积累更符合拟二级动力学模型。通过傅里叶变换红外光谱（FT-IR）和酸碱滴定对丝状真菌进行了表征，通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析，发现菌丝的形态结构在 Eu(III)胁迫下发生了明显变化。结果表明，丝状真菌在环境中放射性核素的迁移和转化中可能发挥重要作用。
