Related Experiment Video
Updated: Jul 3, 2026
08:58
Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
Published on: March 3, 2023
Microbacterium aquimaris sp. nov., isolated from seawater
Kwang Kyu Kim1, Keun Chul Lee, Hee-Mock Oh
1Korean Collection for Type Cultures, Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 52 Eoeun-dong, Yuseong-gu, Daejeon 305-333, Republic of Korea.
Summary
Two novel yellow-pigmented bacterial strains, Microbacterium aquimaris sp. nov., were identified from Korean seawater. These Gram-positive rods represent a new species within the Microbacterium genus.
Area of Science:
- Microbiology
- Bacteriology
- Taxonomy
Background:
- Marine environments harbor diverse microbial communities.
- The genus Microbacterium comprises Gram-positive bacteria with various ecological roles.
- Accurate bacterial classification is crucial for understanding microbial diversity and function.
Purpose of the Study:
- To characterize and classify two novel bacterial strains isolated from seawater.
- To determine the phylogenetic and taxonomic position of the novel strains within the genus Microbacterium.
Main Methods:
- Isolation and cultivation of bacterial strains from seawater.
- Gram staining, motility, and spore formation tests.
- Chemotaxonomic analyses including menaquinone, fatty acid, and cell-wall sugar composition.
- Phylogenetic analysis using 16S rRNA gene sequences.
- DNA-DNA hybridization and phenotypic analyses for species delineation.
Main Results:
- Strains JS54-2(T) and JS63-1 are Gram-positive, non-motile, non-spore-forming short rods forming yellow colonies.
- Chemotaxonomic markers (menaquinones, fatty acids, cell-wall sugars) align with the genus Microbacterium.
- Phylogenetic analysis shows close relatedness to Microbacterium oleivorans and Microbacterium halophilum.
- DNA-DNA hybridization and phenotypic data confirm the strains represent a novel species.
Conclusions:
- Strains JS54-2(T) and JS63-1 are proposed as a new species, Microbacterium aquimaris sp. nov.
- This finding expands the known diversity within the genus Microbacterium.
- The study contributes to the taxonomic understanding of marine bacteria.
More Related Videos
Related Concept Videos
01:18Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
01:21Hyperthermophilic Bacteria
Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their genes show strong...
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
01:26Bacterial Phylum Verrucomicrobiota
The phylum Verrucomicrobiota comprises at least four characterized orders, with most species classified within the order Verrucomicrobiotales. Members of this phylum are either aerobic or facultatively aerobic, with the ability to ferment sugars. A notable exception is the genus Methylacidiphilum, which consists of aerobic methanotrophs. Additionally, some Verrucomicrobiota establish symbiotic relationships with protists. These bacteria are widely distributed across various environments,...
01:28Anoxygenic Phototrophic Bacteria
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
01:18Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...