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( Prakash Om ),( Rup Lal ) 한국미생물생명공학회(구 한국산업미생물학회) 2013 한국미생물·생명공학회지 Vol.41 No.1
An unstable yet efficient phenanthrene-degrading bacterium strain Ph-3 was isolated from a petroleum-contaminated site at the Mathura Oil Refinery, India. The strain was identified as Pseudomonas sp. using a polyphasic approach. An analysis of the intermediates and assays of the degradative enzymes from a crude extract of phenanthrene-grown cells showed a novel and previously unreported pattern of 1, 2-dihydroxy naphthalene and salicylic acid production. While strain Ph-3 lost its phenanthrene- degrading potential during successive transfers on a rich medium, it maintained this trait in oligotrophic soil conditions under the stress of the pollutant and degraded phenanthrene efficiently in soil microcosms. Although the maintenance and in vitro study of unstable phenotypes are difficult and such strains are often missed during isolation, purification, and screening, these bacteria constitute a substantial fraction of the microbial community at contaminated sites and play an important role in pollutant degradation during biostimulation or monitored natural attenuation.
Ankita Dua,Jaya Malhotra,Anjali Saxena,Fazlurrahman Khan,Rup Lal 한국미생물학회 2013 The journal of microbiology Vol.51 No.5
Strain L15T, a Gram-negative, motile, orange colored bacterium was isolated from pond soil in the surrounding area of a hexachlorocyclohexane (HCH) dump site at Ummari village in Lucknow, India. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain L15T belongs to the family Hyphomicrobiaceae in the order Rhizobiales. Strain L15T showed highest 16S rRNA gene sequence similarity to Devosia chinhatensis IPL18T (98.0%). Chemotaxonomic data revealed that the major fatty acids were summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), C18:1 ω7c 11-methyl,C16:0 and C18:0. The major polar lipids of strain L15T were diphosphatidylglycerol and phosphatidylglycerol. The genomic DNA G+C content of strain L15T was 59.8%. Polyamine profile showed the presence of sym-homospermidine with traces of putrescine. Ubiquinone Q-10 was the major respiratory quinone present. Based on these data, strain L15T (=CCM 7977T =DSM 25398T) was classified as a type strain of a novel species, for which the name Devosia lucknowensis sp. nov. is proposed.