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Mohamed Ismaeil,Naoko Yoshida,Arata Katayama 한국미생물학회 2018 The journal of microbiology Vol.56 No.9
A Gram-negative, anaerobic, non-motile, non-spore-forming bacterial strain, designated YN3PY1T, was isolated from a chloroethene-dechlorinating consortium originally enriched from river sediment. The strain enhanced the dechlorination of cis-dichloroethene to ethene by Dehalococcoides, especially at the early stages of cultivation. Strain YN3PY1T was the first isolate of the genus Bacteroides, obtained from animal- independent environments, and its 16S rRNA gene had the highest sequence similarity (97.1%) with Bacteroides luti JCM 19020T in the ‘Coprosuis’ clade of the genus Bacteroides. Strain YN3PY1T formed a phylogenetic cluster with other phylotypes detected from sediments and paddy soil, and the cluster was affiliated with a linage of so-called free-living Bacteroides detected from animal-independent environments, suggesting specific adaptations to sediment-like environments. The strain showed typical phenotypes of Bacteroides, i.e., polysaccharolytic anaerobe having anteiso-C15:0 as the most abundant fatty acid and MK-11 as one of the major respiratory quinones. Additionally, the strain uniquely transforms glucose to lactate and malate, has MK-12 as another major respiratory quinone, and grows at comparatively low temperatures, i.e. 10–40°C, with an optimum at 28°C. Based on the presented data, strain YN3PY1T (= KCTC 15656T = NBRC 113168T) can be proposed as a novel species of the genus Bacteroides and named as Bacteroides sedimenti sp. nov.
Anaerobic Biodegradation of PCP in Japanese Paddy Soils
김효근,Yasushi Inoue,Yuko Handa,Tsuyoshi Yasuta,Kyu-seung Lee,Arata Katayama 한국환경농학회 2004 한국환경농학회지 Vol.23 No.3
Seven soil samples were collected from paddy fields located nearby Nagoya city in Japan. All the soils were subjected to flooded condition and incubated with PCP at 30℃ for two months, and their anaerobic PCP degradation have been monitored by checking the PCP concentration of the soils at regular intervals. The degradation of PCP did not occur in the soils autoclaved two times before pre-incubation. On the other hand, all the soils showed significant PCP degradation in non-sterilized condition after 30 days of incubation, except for one soil sample (Yatomi), in which PCP was rarely degraded until 30 days of incubation. This result showed PCP disappearance in the paddy soils was mainly caused by microbiological activity, and depended upon the physicochemical characteristics of the soils.
Originals : Anaerobic Biodegradation of PCP in Japanese Paddy Soils
( Hyo Keun Kim ),( Yasushi Inoue ),( Yuko Handa ),( Tsuyoshi Yasuta ),( Kyu Seung Lee ),( Arata Katayama ) 한국환경농학회 2004 한국환경농학회지 Vol.23 No.3
For the improvement of gas chromatographic analysis of multiple pesticide residues in green pepper, lettuce and Chinese cabbage, multiresidue test mixtures (MRTMs) of 10 groups (ECD 5 groups and NPD 5 groups) and a recovery test mixture (RTM) of 18 compounds (11 compounds for ECD and 7 compounds for NPD) were established based on retention time and response to relevant detectors. A new extraction solvent (acetone : acetonitrile=1 : 9) and a clean up eluent (hexane : dichloromethane : acetonitile = 50 : 48.5: 1.5) for solid-phase extraction (SPE) cartridge were selected to test two types of multiresidue methods (MRM Ⅰ and MRM Ⅱ). MRM Ⅱ provided high recovery better than MRM Ⅰ when RTM was tested. Recovery experiment with MRTMs which was conducted using MRM Ⅱ resulted in that more than seventy percents of compounds were recovered in the range of 50~140%, while 9% of compounds were over 140% of recovery and only 7~8 compounds failed to detect. MRM Ⅱ, an improved method, could be employed for screening residues of 190 pesticides in those vegetables.