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카벤다짐 분해 미생물인 Rhodococcus sp. 3-2의 대량 배양 및 미생물 제제 개발
박준경 ( Jun-kyung Park ),임성훈 ( Seonghun Im ),김정원 ( Jeong Won Kim ),지정환 ( Jung-hwan Ji ),김공민 ( Kong-min Kim ),박해성 ( Haeseong Park ),윤영석 ( Yeong-seok Yoon ),원항연 ( Hang-yeon Weon ),한귀환 ( Gui Hwan Han ) 한국환경농학회 2023 한국환경농학회지 Vol.42 No.4
Rhodococcus sp. 3-2 strain has been reported to degrade benzimidazole-based pesticides, such as benomyl and carbendazim. Therefore, this study aimed to optimize culture medium composition and culture conditions to achieve cost-effective and efficient large-scale production of the Rhodococcus sp. 3-2 strain. The study identified that the optimal media composition for mass culture comprised 0.5% glucose, 0.5% yeast extract, 0.15% NaCl, 0.5% K<sub>2</sub>HPO<sub>4</sub>, 0.5% sodium succinate, and 0.1% MgSO<sub>4</sub>. Additionally, a microbial agent was developed using a 1.5-ton fermenter, with skim milk (20%), monosodium glutamate (15%), and vitamin C (2%) as key components. The storage stability of the microbial agent has been confirmed, with advantages of low temperature conservation, which helps to sustain efficacy for at least six months. We also assessed the benomyl degradation activity of the microbial agent within field soil. The results revealed an over 90% degradation rate when the concentration of viable cells exceeded 2.65 × 10<sup>6</sup> CFU/g after a minimum of five weeks had elapsed. Based on these findings, Rhodococcus sp. 3-2 strain can be considered a cost-effective microbial agent with diverse agricultural applications.
Park, Minjoon,Jeon, In-Yup,Ryu, Jaechan,Jang, Haeseong,Back, Jong-Beom,Cho, Jaephil Elsevier 2016 Nano energy Vol.26 No.-
<P><B>Abstract</B></P> <P>The catalytic activity of V<SUP>2+</SUP>/V<SUP>3+</SUP> and VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> redox couples on the halogen-doped graphene nanoplatelets (F-, Cl-, and Br-GNPs) is studied by ball-milling graphite flakes with fluorine (F<SUB>2</SUB>), chlorine (Cl<SUB>2</SUB>), and bromine (Br<SUB>2</SUB>) molecules, respectively. Using the edge-selectively halogenated graphene materials with different edge exfoliation degrees, the vanadium redox reactions can be significantly facilitated by having abundant edge defects with large surface area in the order: Br-GNP>Cl-GNP>F-GNP. The influence of halogen functionalization on graphene nanoplatelets towards vanadium redox couples is further confirmed by stack-type vanadium redox flow batteries that demonstrates better cell performance than graphene nanoplatelets without dopant at the edges. Notably, the Br-GNP showed unique electrochemical performance of increased initial charge/discharge capacity and improved rate capability, respectively. It was found that halogen doping on graphene-based materials can promote vanadium redox reactions by creating effective active sites, and the electrocatalytic activity is dependent on edge exfoliation degree and well-preserved basal planes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Edge-halogenated graphene nanoplatelets for vanadium redox reactions was studied. </LI> <LI> Halogen doping on graphene-based materials can promote vanadium redox reactions. </LI> <LI> A large degree of edge exfoliation by Br facilitates mass transport of vanadium ions. </LI> <LI> Br-GNP catalyst leads to decrease of cell overpotentials in VRFBs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>