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Kim, Baikho,Hwang, Soonjin,Kim, Youngok,Hwang, Suok,Takamura, Noriko,Han, Myungsoo Japanese Society of Microbial Ecology · The Japane 2007 Microbes and environments Vol.22 No.1
<P>Biological control agents such as bacteria and ciliates were tested alone and in combination for their abilities to decrease densities of the warm-weather cyanobacterium, <I>Microcystis aeruginosa</I>, and the cold-weather centric diatom, <I>Stephanodiscus hantzschii</I>. The growth of <I>Microcystis aeruginosa</I> was effectively suppressed by the algicidal bacterium, <I>Streptomyces neyagawensis</I>, and the predator heterotrich ciliate, <I>Stentor roeselii</I>. However, co-treatment increased the algal density rather than decreasing it, suggesting that <I>Streptomyces neyagawensis</I> and <I>Stentor roeselii</I> have an antagonistic relationship. Additional experiments revealed that the density of <I>Stephanodiscus hantzschii</I> was effectively reduced by the bacterium, <I>Pseudomonas putida</I>, and by the abovementioned strain of <I>Stentor roeselii</I>. Co-treatment had a greater antialgal effect than treatment with either bio-agent alone, indicating that the two act synergistically. These results suggest the potential antialgal efficacy of treatments with multiple biological control agents, providing new insight that may be useful for the bioremediation of nuisance algal blooms in freshwater.</P>
Unno, Tatsuya,Han, Dukki,Jang, Jeonghwan,Widmer, Kenneth,Ko, GwangPyo,Sadowsky, Michael J.,Hur, Hor-Gil Japanese Society of Microbial Ecology · The Japane 2011 Microbes and environments Vol.26 No.3
<P>South Korea uses more antibiotics for animal production than any other member of the OECD. The excessive use could potentially lead to a greater incidence of antibiotic resistant microorganisms, some of which may be pathogenic. In this study, we examined potential diarrheagenic and extraintestinal pathogenic <I>E. coli</I> (ExPEC) isolates using virulence gene profiling (<I>eaeA</I>, <I>est</I>, <I>elt</I>, <I>ipaH</I>, <I>stx1</I> and <I>stx2</I> as diarrheagenic and <I>afa/dra</I>, <I>iutA</I>, <I>kpsMT II</I>, <I>papA/C</I>, and <I>sfa/foc</I> as extraintestinal pathogenic virulence genes). A cluster analysis of DNA fingerprint data indicated that certain genotypes of chicken <I>E. coli</I> isolates are likely ExPEC. Moreover, our results showed 38 of the 60 potential diarrheagenic and ExPEC isolates obtained from animals and humans were also resistant to antibiotics, mostly to tetracycline groups, penicillin groups, and folate pathway inhibitors. Our results suggest that the use of antibiotics in agriculture should be controlled due to potential impacts on human health.</P>