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Simultaneous DNA-RNA Extraction from Coastal Sediments and Quantification of 16S rRNA Genes and Transcripts by Real-time PCR

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Devosia subaequoris sp. nov., isolated from beach sediment.

Soon Dong Lee¹

¹Department of Science Education, Cheju National University, Jeju 690-756, Republic of Korea.

International Journal of Systematic and Evolutionary Microbiology

|October 4, 2007

Summary

A new marine bacterium, Devosia subaequoris, was discovered in Korean beach sediment. This aerobic, motile rod requires sea salts and thrives in a wide pH and temperature range.

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Published on: September 18, 2009

Area of Science:

Microbiology
Marine Biology
Bacteriology

Background:

Marine environments harbor diverse microbial life.
Sediment samples are rich sources for isolating novel microorganisms.
The genus Devosia is known for its diverse metabolic capabilities.

Purpose of the Study:

To isolate and characterize a novel marine bacterium.
To determine the phylogenetic placement of the new isolate.
To propose a new species within the genus Devosia.

Main Methods:

Isolation from marine sediment.
Gram staining, motility tests, and biochemical assays (oxidase, catalase).
Phylogenetic analysis using 16S rRNA gene sequences.
Determination of growth conditions (temperature, pH, salinity).
Analysis of cellular fatty acids, ubiquinones, and DNA G+C content.

Main Results:

A novel Gram-negative, aerobic, motile rod bacterium was isolated.
The isolate exhibited a wide growth range (20-42°C, pH 5.1-12.1) and required sea salts.
Phylogenetic analysis placed the isolate within the genus Devosia, closely related to D. riboflavina.
Biochemical characterization and phylogenetic data supported its classification as a new species.

Conclusions:

Strain HST3-14(T) represents a novel species, Devosia subaequoris sp. nov.
This discovery expands the known diversity of the genus Devosia.
Devosia subaequoris has unique physiological characteristics adapted to marine environments.