Publications by authors named "Ken-ichiro Suzuki"

To understand the species distribution, diversity, and density of lipomycetaceous yeasts in soil based on their north-to-south location in Japan, 1146 strains were isolated from soil samples at 11 locations from Hokkaido to Okinawa Prefecture and taxonomically characterized. Lipomycetaceous yeast strains were isolated efficiently from soil by selecting watery mucoid-like colonies on agar plates with nitrogen-depleted medium. Twenty-four (80%) of the 30 known species of the genus were isolated from the soil samples collected in Japan, including species recently proposed.

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  • 2,3,5-Triphenyl tetrazolium chloride (TTC) is a staining method that shows mitochondrial activity in cells by changing color from colorless to red under reducing conditions, but it was unclear which electron transport system enzymes were involved in this reduction.* -
  • Research using yeast gene disruptants revealed that different disruptants affect TTC reduction differently, with white colonies indicating disruption related to certain enzymatic processes, while red colonies indicate intact electron transport functions up to ubiquinone.* -
  • Further investigations showed that only ubiquinol-cytochrome c oxidoreductase was responsible for TTC reduction, and while strains without TTC activity showed similarities in fermentation profiles, their growth and byproduct production varied, suggesting
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Fourteen novel lipomycetaceous yeasts species were isolated from soil samples collected from the Hokkaido, Chiba and Okinawa prefectures of Japan. Phylogenetic analyses of the D1/D2 domains of the large subunit rRNAs and translation elongation factor 1 alpha genes () revealed that five strains of two species from the soil in Furano-shi, Hokkaido were related to and 29 strains representing 12 species from soils in Kamogawa-shi, Chiba and Iriomote Island, Okinawa were in the clade. The two species of form globose or ellipsoid ascospores in their sac-like ascus and pseudohyphae.

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Type strains of 72 validated Nocardia species were phylogenetically analyzed based on the multilocus sequence analysis (MLSA) concatenated atpD-groL1-groL2-recA-rpoA-secY-sodA-ychF. Furthermore, their similarity based on digital DNA-DNA hybridization (dDDH) was calculated. Nocardia soli, Nocardia cummidelens and Nocardia salmonicida, Nocardia nova and Nocardia elegans, Nocardia exalbida and Nocardia gamkensis, and Nocardia coubleae and Nocardia ignorata formed coherent clades, respectively.

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Fluorescence in situ hybridization (FISH) has been employed to identify microorganisms at the single cell level under a microscope. Extensive efforts have been made to improve and extend the FISH technique; however, the development of a widely applicable protocol is a continuing challenge. The present study evaluated the effects of divalent cations in the hybridization solution on the FISH-based detection of various species of bacteria and archaea with rRNA-targeted probes.

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We have developed butanol-producing consolidated bioprocessing from cellulosic substrates through coculture of cellulolytic clostridia and butanol-producing strain N1-4. However, the butanol fermentation by strain N1-4 (which has an optimal growth temperature of 30°C) is sensitive to the higher cultivation temperature of 37°C; the nature of this deleterious effect remains unclear. Comparison of the intracellular metabolites of strain N1-4 cultivated at 30°C and 37°C revealed decreased levels of multiple primary metabolites (notably including nucleic acids and cofactors) during growth at the higher temperature.

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A bacterial strain, designated 5GHs33-3T, was isolated from greenhouse soil collected from Yongin region, Gyeonggi province, South Korea. The strain was an aerobic, Gram-stain-positive, flagellated, rod-shaped bacterium. Strain 5GHs33-3T grew at 4-37 °C (optimally at 28-30 °C), pH 6.

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The aim of this study was to reclarify the taxonomic relationship among Streptomyces hygroscopicus subsp. hygroscopicus, Streptomyces endus and Streptomyces sporocinereus. Whole genome shotgun sequencing was performed for the type strains of these three taxa.

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A novel and extremely halophilic archaeon, designated strain 2a_47_2T, was isolated from a solar saltern sample collected in Indonesia. Cells of the strain were Gram-stain-negative, non-motile and pleomorphic and formed orange-red pigmented colonies. Strain 2a_47_2T grew at 20-48 °C (optimum 38-41 °C), pH 6.

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A novel spherical actinobacterium, designated RS-2-3T, was isolated from the rhizosphere of a mangrove growing on Rambut Island, Indonesia, and its taxonomic position was investigated using a polyphasic approach. Phylogenetic analysis based on 16S rRNA gene sequence comparison revealed that strain RS-2-3T was related to the members of the genus Kocuria. The highest 16S rRNA gene sequence similarity value was observed with Kocuria marina KMM 3905T (97.

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Here, we report the draft genome sequence of strain NBRC 16556, deposited as Streptomyces hygroscopicus subsp. hygroscopicus into the NBRC culture collection. An average nucleotide identity analysis confirmed that the taxonomic identification is correct.

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A novel Gram stain positive actinobacterium, designated RS-7-4(T), was isolated from a sea sediment sample collected in Indonesia, and its taxonomic position was investigated using a polyphasic approach. Strain RS-7-4(T) was observed to form vegetative hyphae in the early phase of growth, but the hyphae eventually fragmented into short rods to coccoid cells. Growth occurred at 15-37 °C, pH 6.

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A novel bacterium, strain 7515T-26T, was isolated from an air sample collected in Taean region, Republic of Korea. Cells were aerobic, Gram-stain-positive, non-flagellated cocci, growing in the temperature, pH and NaCl ranges of 10-33 °C, pH 5.0-9.

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  • A novel Dehalococcoides sp. strain UCH007, isolated from chlorinated ethene-polluted groundwater in Japan, can dechlorinate harmful compounds like trichloroethene and vinyl chloride to ethene.
  • Genome sequencing of this difficult-to-cultivate bacteria was achieved through a new differential reads picking method applied to mixed genomic DNA.
  • The genome of strain UCH007 is 1,473,548 base pairs long, contains 1,509 coding sequences, and notably includes 29 putative reductive dehalogenase genes, marking it as the first in its subgroup to have specific genes pceA, tceA, and vcrA.
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A novel halophilic archaeon, designated strain 2b_61_3T, was isolated from a solar saltern in Indonesia. Cells of the strain were Gram-stain-negative, motile, pleomorphic rods that formed orange-red-pigmented colonies on solid medium. The isolate grew optimally at 42-44 °C, pH 6.

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Lactobacillus acetotolerans RIB 9124 (NBRC 13120) was isolated from putrefied (hiochi) Japanese sake. Here we report the complete genome sequence of this organism. This paper is the first report demonstrating the fully sequenced and completely annotated genome of a L.

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Thirteen novel Gram-stain-positive bacteria were isolated from various samples collected from mangrove forests in Japan, and their taxonomic positions were investigated by a polyphasic approach. Phylogenetic analyses based on 16S rRNA gene sequence comparisons showed that the 13 isolates formed a single clade with Lysinimicrobium mangrovi HI08-69T, with a similarity range of 97.6-99.

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  • - A new bacterial strain, PSGM2-16(T), was isolated from rice paddy soil in Suwon, South Korea, characterized as aerobic, Gram-positive, and having a short-rod shape with a polar flagellum.
  • - DNA analysis showed PSGM2-16(T) has high sequence similarity with bacteria in the Intrasporangiaceae family and forms a subgroup with certain known strains, while DNA-DNA hybridization values were below 70%.
  • - Based on its unique features, PSGM2-16(T) is proposed as a new species in a new genus named Oryzobacter terrae, with PSGM2-16(T) serving as the type strain.
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Three Lactobacillus-like strains, NB53T, NB446T and NB702, were isolated from traditional fermented food in Thailand. Comparative 16S rRNA gene sequence analysis indicated that these strains belong to the Lactobacillus plantarum group. Phylogenetic analysis based on the dnaK, rpoA, pheS and recA gene sequences indicated that these three strains were distantly related to known species present in the L.

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The entomogenous anamorphic fungus Isaria takamizusanensis has not been resolved clearly in its teleomorphic state. We succeeded in inducing ascostroma formation by incubating conidiomata of I. takamizusanensis on cicada adults in a moist chamber.

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Sulfurospirillum strains UCH001 and UCH003 were isolated from anaerobic cis-1,2-dichloroethene-dechlorinating microbial consortia derived from groundwater in Japan. Here, we report the complete genome sequences of strains UCH001 and UCH003.

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Two novel Gram-stain positive actinobacteria, designated PS-14-16(T) and RS-7-1, were isolated from the rhizosphere of a mangrove and sea sediment, respectively, and their taxonomic positions were investigated by a polyphasic approach. Both strains were observed to form vegetative hyphae in the early phase of growth but the hyphae eventually fragment into short rods to coccoid cells. The peptidoglycan type of both strains was found to be A4α.

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