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  • Authors: Yayoi Sakiyama; Nguyen K.N. Thao; Nguyen M. Giang; Shinj Miyadoh; Duong V. Hop; Katsuhiko Ando (2009)

  • Three actinomycetes, designated strains VN05A0342, VN05A0351 and VN05A0415T, were isolated from plant-litter samples collected in the north of Vietnam and examined in a polyphasic taxonomic study. Phylogenetic analysis based on the 16S rRNA gene sequences showed that these isolates were most closely related to the type strain of Kineosporia mikuniensis (98.5% sequence similarity). Morphological properties (the formation of spore domes and motile spores) and chemotaxonomic data supported the assignment of the three isolates to the genus Kineosporia.The isolates all contained the following: meso-diaminopimelic acid in the peptidoglycan (with small amounts of the LL isomer); ribose, mannose, galactose and glucose as the whole-cell sugars; MK-9(H4) as the predominant isoprenoid quino...

  • Article


  • Authors: Phan Thi Phuong Hoa; Satoshi Managaki; Norihide Nakada; Hideshige Takada; Akiko Shimizu; Duong Hong Anh; Pham Hung Viet; Satoru Suzuki (2011-04-13)

  • The ubiquitous application and release of antibiotics to the environment can result in bacterial antibiotic resistance, which in turn can be a serious risk to humans and other animals. Southeast Asian countries commonly apply an integrated recycling farm system called VAC (Vegetable, Aquaculture and Caged animal). In the VAC environment, antibiotics are released from animal and human origins, which would cause antibiotic-resistant bacteria (ARB). This study evaluated occurrence of ARB in the VAC environment in northern Vietnam, with quantitative analysis of antibiotic pollution. We found that sulfonamides were commonly detected at all sites. In dry season, while sulfamethazine was a major contaminant in pig farm pond (475-6662 ng/l) and less common in city canal and aquaculture site...

  • Article


  • Authors: Yayoi Sakiyama; Nguyen K.N. Thao; Hoang V. Vinh; Nguyen M. Giang; Shinj Miyadoh; Duong V. Hop; Katsuhiko Ando (2010)

  • A novel actinomycete, designated strain VN05A0561T, was isolated from plant litter collected at Ba Be National Park, Vietnam. The substrate mycelia and spore chains fragmented in a manner similar to nocardioform actinomycetes; the spores had smooth surfaces and were rod-shaped. Strain VN05A0561T had the following chemotaxonomic characteristics: meso-diaminopimelic acid in the cell-wall peptidoglycan, arabinose and galactose as characteristic sugars, MK-8(H4) as the major isoprenoid quinone, phosphatidylcholine as the diagnostic phospholipid and iso-C16:0 as the major cellular fatty acid. Strain VN05A0561T shared low levels of 16S rRNA gene sequence similarity (<97%) with the type strains of recognized species of the genus Pseudonocardia and could be differentiated from its closest p...

  • Article


  • Authors: Phan Thi Phuong Hoa; Nguyen Duc Quang; Yayoi Sakiyama; Duong Van Hop; Dinh Thuy Hang; Trinh Hoang Ha; Nguyen Thi Van; Nguyen Thi Kim Quy; Nguyen Thi Anh Dao (2012-08-03)

  • Bacterial blight disease caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the major diseases in rice culture of Northen Vietnam, as well as other rice-growing regions of the world. In this study, we isolated and screened for actinomycete strains from Vietnam with the ability to inhibit Xoo isolates from northern Vietnam. From 90 actinomycete strains taken from soil in northern Vietnam in 2010, we screened for their antagonistic activity against 10 races of Xoo causing rice bacterial blight disease. Three actinomycete strains were found to inhibit all 10 Xoo races. Among the three strains, a strain namely VN10-A-44 was shown not to have the ability to produce toxic compounds and was selected for further study. The strain was identified as Streptomyces virginiae by 16S ribosoma...