O. Yagi

Publications106
h-index22
Citations1,618
Highly Influential Citations90
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Communities of ammonia-oxidizing bacteria in activated sludge of various sewage treatment plants in Tokyo.
TLDR
This investigation investigated ammonia-oxidizing bacteria in activated sludge collected from 12 sewage treatment systems, whose ammonia removal and treatment processes differed, during three different seasons, using real-time PCR quantification and specific PCR followed by denaturing gel gradient electrophoresis, cloning, and sequencing of 16S rRNA genes to analyze ammonia-Oxidizing bacterial communities. Expand
Degradation of natural estrogen and identification of the metabolites produced by soil isolates of Rhodococcus sp. and Sphingomonas sp.
TLDR
Five bacterial strains capable of utilizing 17beta-estradiol and estrone were isolated from soil samples and showed high E1 and E2 degradation activities, implying degradation through a second pathway initiated through an attack of the saturated ring. Expand
Degradation of polychlorinated biphenyls by microorganisms
The biodegradation of PCB's by microorganisms and the degradation pathway of PCB's are investigated. Experimental methods and materials are described. Only several strains of bacteria, Achromobacter… Expand
Transformation of Pseudomonas putida by electroporation.
TLDR
Electrotransformation efficiencies of relaxed plasmid DNA treated with topoisomerase I and that linearized by EcoRI digestion were high and are useful for the direct cloning of P. putida PpY101. Expand
Degradation of polycyclic aromatic hydrocarbons by a newly isolated dibenzofuran-utilizing Janibacter sp. strain YY-1
TLDR
Results indicate that strain YY-1 can catalyze angular dioxygenation, lateral dioxylation, and sulfoxidation and can cometabolize a variety of polycyclic aromatic hydrocarbons including dibenzo-p-dioxin, phenanthrene, and anthracene. Expand
Effects of ammonium and nitrite on communities and populations of ammonia-oxidizing bacteria in laboratory-scale continuous-flow reactors.
TLDR
This study investigated the effects of ammonium and nitrite on ammonia-oxidizing bacteria (AOB) from an activated sludge process in laboratory-scale continuous-flow reactors using enriched culture possessing both N. oligotropha and N. europaea. Expand
Identification of putative benzene-degrading bacteria in methanogenic enrichment cultures.
Anaerobic benzene-degrading enrichment cultures performing methanogenesis were obtained from non-contaminated lotus field soil. Stable isotope probing with 13C benzene was used to detect the bacteria… Expand
Isolation and Characterization of the Slime from a Cyanobacterium, Microcystis aeruginosa K-3A
A slime material was isolated from axenic cells of the cyanobacterium, Microcystis aeruginosa K-3A, grown in a synthetic medium. Isolation and purification of the slime material were facilitated by… Expand
Growth Inhibition of Microcystis Cyanobacteria by L -Lysine and Disappearance of Natural Microcystis Blooms with Spraying
TLDR
Results confirmed in experimental ponds outdoors by spraying L-lysine onto natural Microcystis blooms in the summer of 1999 and 2000 and showed a dramatic change in the color and transparency of the pond surface water. Expand
Random amplified polymorphic DNA (RAPD) analyses for discriminating genotypes of Microcystis cyanobacteria.
TLDR
A good accordance between the RAPD analysis and allozyme divergence indicated a high reliability of both methods for discrimination of the affiliated groups of Microcystis. Expand
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