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Publications (70)
A rod-shaped, non-motile, Gram-negative bacterium, strain RS28T, was isolated from rice straw used as material for periphyton growth. Phylogenetic analysis of the 16S rRNA gene sequence revealed that strain RS28T was affiliated with the genus Mucilaginibacter and had the highest sequence similarity to Mucilaginibacter ginkgonis HMF7856T (96.47 %) a...
Margalefidinium polykrikoides causes significant economic losses in the aquaculture industry by red tide formation. Algicidal bacteria have attracted research interests as a potential bloom control approach without secondary pollution. Qipengyuania sp. 3-20A1M, isolated from surface seawater, exerted an algicidal effect on M. polykrikoides. However...
Global warming and eutrophication accelerated Microcystis blooms, causing water quality deterioration. Cyanocides produced by cyanobactericidal bacteria have attracted substantial attention for controlling Microcystis blooms owing to their environmental friendliness. However, their application is still in the early stages, highlighting the need for...
A Gram-stain-negative, rod-shaped bacterial strain, JC4T, was isolated from a freshwater sample and determined the taxonomic position. Initial identification based on 16S rRNA gene sequences revealed that strain JC4T is affiliated to the genus Mucilaginibacter with a sequence similarity of 97.97% to Mucilaginibacter rigui WPCB133T. The average nucl...
A microcystin-degrading bacterial strain, Blastomonas fulva T2, was isolated from the culture of a microalgae Microcystis. The strain B. fulva T2 is Gram-stain-negative, non-motile, aerobic, non-spore-forming and phototrophic. The cells of B. fulva T2 are able to grow in ranges of temperature from 15 to 37 °C, with a pH of 6 to 8 and a salinity of...
Microcystis blooms pose a major threat to the quality of drinking water. Cyanobactericidal bacteria have attracted much attention in the research community as a vehicle for controlling Microcystis blooms because of their ecological safety. Nonetheless, most studies on cyanobactericidal bacteria have been conducted on a laboratory scale but have not...
A Gram-negative, red-colored, and rod-shaped bacterial strain, DH14T, was isolated from a eutrophic reservoir. The 16S rRNA gene sequence analysis showed that strain DH14T was most closely related to Hymenobacter terrigena (98.3% similarity) and Hymenobacter terrae (98.1%). The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dD...
Microcystis sp., amongst the most prevalent bloom-forming cyanobacteria, is typically found as a colonial form with multiple microorganisms embedded in the mucilage known as extracellular polymeric substance. The colony-forming ability of Microcystis has been thoroughly investigated, as has the connection between Microcystis and other microorganism...
A Gram-stain-negative, rod-shaped bacterial strain DH6T was isolated from fresh water of the Daechung Reservoir during the Microcystis bloom period. The strain grew at pH 6.0–8.5, at temperature 17–40 °C, and at 0–1% (w/v) NaCl concentration. Comparison of 16S rRNA gene sequence indicated that strain DH6T exhibits the highest similarity with Panaci...
Haematococcus lacustris is a chlamydomonadalean with high biotechnological interest owing to its capacity to produce astaxanthin, a valuable secondary carotenoid with extraordinary antioxidation properties. However, its prolonged growth has limited its utility commercially. Thus, rapid growth to attain high densities of H. lacustris cells optimally...
A marine phytoplankton dinoflagellate, Alexandrium sp. is known to cause worldwide harmful algal blooms, resulting in paralytic shellfish poisoning. In this study, we isolated a novel compound secreted by the marine bacterium Pseudoruegeria sp. M32A2M, and showed that it displays algicidal activity against A. catenella (group I). The molecular stru...
A Gram-stain-negative, white-coloured, and rod-shaped bacterium, strain DR4-4T, was isolated from a Daechung Reservoir, Republic of Korea, during Microcystis bloom. Strain DR4-4T was most closely related to Caenimonas terrae SGM1-15T and Caenimonas koreensis EMB320T with 98.1% 16S rRNA gene sequence similarities. The average nucleotide identity (AN...
The excessive proliferation of Microcystis aeruginosa can lead to ecological damage, economic losses, and threaten animal and human health. For controlling Microcystis blooms, microorganism-based methods have attracted much attention from researchers because of their eco-friendliness and species-specificity. Herein, we first found that a Paucibacte...
Antibiotic pollution is an emerging environmental challenge. Residual antibiotics from various sources, including municipal and industrial wastewater, sewage discharges, and agricultural runoff, are continuously released into freshwater environments, turning them into reservoirs that contribute to the development and spread of antibiotic resistance...
Haematococcus lacustris is a green unicellular alga known for its diverse beneficial carotenoid, such as β-carotene, canthaxanthin, and astaxanthin, with varying compositions at different morphological stages. Each carotenoid might affect the lifespan of Caenorhabditis elegans by inhibiting reactive oxygen species (ROS). C. elegans were fed with ca...
Harmful algal blooms caused by Cochlodinium polykrikoides result in enormous economic damage to the aquaculture industry. Biological control methods have attracted wide attention due to their environmental-friendliness. In this study, a novel algicidal bacterium, designated strain M26A2M T , was determined for its taxonomic position and was evaluat...
The marine dinoflagellate Alexandrium is associated with harmful algal blooms (HABs) worldwide, causing paralytic shellfish poisoning (PSP) in humans. We found that the marine bacterium Pseudoruegeria sp. M32A2M exhibits algicidal activity against Alexandrium catenella (Group I), inhibiting its motility and consequently inducing cell disruption aft...
A novel Gram-stain-negative, rod-shaped, aerobic, non-motile bacterial strain, designated M5A1MT, was isolated from seawater collected from the South Sea of the Republic of Korea. Based on 16S rRNA gene sequence similarity, strain M5A1MT was closely related to Mariniflexile gromovii KMM 6038T (95.3 %), Mariniflexile fucanivorans SW5T (95.2 %), Mari...
Microalgal treatment of undiluted raw piggery wastewater is challenging due to ammonia toxicity and a deep dark color hampering photosynthesis. To overcome these problems, (1) a microalga (Coelastrella sp.) was isolated from an ammonia-rich environment, (2) the wastewater treatment was divided into two steps: a heterotrophic process followed by a m...
Erythrobacter species are extensively studied marine bacteria that produce various carotenoids. Due to their photoheterotrophic ability, it has been suggested that they play a crucial role in marine ecosystems. It is essential to identify the genome sequence and the genes of the species to predict their role in the marine ecosystem. In this study,...
A Gram-stain-negative, non-motile, rod-shaped, aerobic bacterial strain, designated HC2 T , was isolated from the phycosphere of Haematococcus lacustris NIES 144 culture. Strain HC2 T was able to grow at pH 4.5–8.0, at 4–32 °C and in the presence of 0–2 % (w/v) NaCl. Phylogenetic analysis of the 16S rRNA gene sequence revealed that strain HC2 T was...
A novel Gram-stain-negative, aerobic, and rod-shaped bacterial strain, M24A2M T , was isolated from seawater in the Republic of Korea. On the basis of the 16S rRNA gene phylogeny, strain M24A2M T was found to be closely related to Novosphingobium pentaromativorans US6-1 T and Novosphingobium mathurense SM117 T with pair-wise sequence similarities o...
A novel non-phototrophic member of the genus Rhodoferax was obtained from freshwater. The purpose of this study was to analyse the genome of a nonphototrophic strain and propose a new species based on its phylogenetic, genomic, physiological and chemotaxonomic characteristics. The results of phylogenetic analysis based on 16S rRNA gene sequences su...
This genus contains both phototrophs and nonphototrophic members. Here, we present a high-quality complete genome of the strain CHu59-6-5T, isolated from a freshwater sediment. The circular chromosome (4.39 Mbp) of the strain CHu59-6-5T has 64.4% G+C content and contains 4240 genes, of which a total of 3918 genes (92.4%) were functionally assigned...
The symbiotic nature of the relationship between algae and marine bacteria is well-studied among the complex microbial interactions. The mutual profit between algae and bacteria occurs via nutrient and vitamin exchange. It is necessary to analyze the genome sequence of a bacterium to predict its symbiotic relationships. In this study, the genome of...
Variant morphotypes (smooth; S-type and wrinkled; W-type cells) of Microcystis aeruginosa KW strain were observed in bloom samples and during the cultivation of cells in static broth cultures. RNA-seq based whole transcriptome sequencing was performed to examine the pattern of gene expression in these morphotypes. In total 493 differentially expres...
To elucidate the interspecies connectivity between cyanobacteria and other bacteria (non-cyanobacteria) during cyanobacterial harmful algal blooms (cyanoHABs), samples were collected from the Nakdong River, Korea, from June 2016 to August 2017, and microbial recurrent association network (MRAN) analysis was performed to overcome the limitations of...
Abstract To investigate the interactions between bacterial species in relation to the biotic and abiotic environmental fluctuations, free-living (FL), nanoparticle-associated (NP), and microparticle-associated (MP) bacterial community compositions (BCCs) were analyzed. A total of 267 samples were collected from July to December 2016 in the dynamic...
Two Gram-stain-negative bacterial strains, DS48-3T and CH68-4T, were isolated from freshwater sediment taken from the Daechung Reservoir, Republic of Korea. Cells of strains DS48-3T and CH68-4T were aerobic, non-motile, non-spore-forming and rod-shaped. Strain DS48-3T was isolated from a sediment surface sample at a depth of 48 m from the Daechung...
Diverse methods have been applied to control cyanobacterial bloom, but no universal method has been developed. Periphytons (attached microalgae) compete with cyanobacteria for nutrients and thus were cultivated and regularly harvested for nutrient reduction and bloom control. Four mesocosms, with different amounts of supporting materials, were cons...
A polyphasic taxonomic study was carried out on strains PB105T and PB108 isolated from a grass soil in Korea. The cells of the strains were Gram-stain negative, non-spore-forming, non-motile, and rod-shaped. Comparative 16S rRNA gene sequence studies showed a clear affiliation of these strains with Bacteroidetes, which showed high pairwise sequence...
Fusaricidin analogs, produced by Paenibacillus polymyxa, were tested for selective control of a major bloom-forming cyanobacterium Microcystis sp. Fusaricidin (A and B mixtures) and four analogs were isolated from P. polymyxa E681 and investigated for their inhibition of cyanobacterial cell growth. Among the four fusaricidin analogs, fraction 915 D...
Bloom-forming cyanobacteria pose concerns for the environment and the health of humans and animals by producing toxins and thus lowering water quality. Here, we report near-complete genome sequences of two Microcystis strains under xenic culture conditions, which were originally isolated from two separate freshwater reservoirs from the Republic of...
Microorganisms have the tendency to accumulate at interfaces through the release of extracellular polymeric substances to form aggregates such as films or flocs. This physical association leads to different modes of interactions among cells and the subsequent development of functionally and metabolically diverse consortia. Aggregation of cells in a...
Interactions between microalgae and bacteria are often obligatory for harmful algal blooms (HABs). Here, we investigated the specific bacterial communities associated with Alexandrium tamarense and Cochlodinium polykrikoides, which cause ecological and economic damage during their blooms. To this end, the bacterial metagenome was selectively isolat...
This study used a single strain Ettlia sp. YC001 and two stages to optimize the production of three materials: lipids, lutein, and β-carotene. In the cultivation stage for lutein production, different temperatures, light qualities, and intensities were applied. The highest biomass was obtained at 35 °C, but the maximum lutein productivity of 6.1 mg...
Periphyton comprises a broad range of autotrophic and heterotrophic organisms that grow on submerged surfaces in aquatic environments. To investigate the ecological roles of periphyton and their symbiotic bacterial assemblages related to the control of cyanobacterial blooms, mesocosm experiments were performed in a eutrophic lake that is usually in...
The increased inputs of nutrients have been demonstrated to be a major contributing factor to the eutrophication of lakes and reservoirs which can lead to the production of harmful algal/cyanobacterial blooms and deleteriously affect the aesthetics of water-bodies. Floating plant-culture systems have been widely used for the ecological remediation...
A novel Gram-negative bacterium strain, DRW22-8(T), was isolated from fresh water taken at a depth of 22 m at Daechung Reservoir, Republic of Korea. The cells of strain DRW22-8(T) were aerobic and motile with a single polar flagellum or non-motile (stalked), and formed creamy-white colonies on R2A agar. The phylogenetic analysis based on 16S rRNA g...
A novel Gram-stain-negative, rod-shaped and non-motile bacterial strain, designated strain Seoho-37T, was isolated from a eutrophic lake in South Korea. Polyphasic studies were performed to investigate the taxonomic position of the new isolate. The isolate grew aerobically with 0-1.0 % (w/v) NaCl (optimum 0 %), at pH 6.0-10.0 (optimum pH 7.0-9.0) a...
A novel Gram-negative, rod-shaped and motile bacterial strain, designated strain M36(T), was isolated from a culture of a bloom-forming cyanobacterium, Microcystis sp., collected from a eutrophic lake in Korea. Its taxonomic position was investigated by using a polyphasic taxonomic approach. The isolate was found to grow aerobically at 15-42 °C (op...
A Gram-stain-negative, aerobic, rod-shaped and motile bacterium, designated M23T, was isolated from a laboratory culture of a bloom-forming cyanobacterium, Microcystis, which was isolated from a eutrophic lake in Korea. The strain grew optimally without NaCl and at 25-30 °C on R2A agar medium. Phylogenetic analysis based on 16S rRNA gene sequences...
Two Gram-stain-negative, aerobic, non-motile, non-spore-forming and rod-shaped bacteria, designated strains T2T and T5, were isolated from a culture of Microcystis from Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies placed the new isolates in the class Alphaproteobacteria and, notably, most closely related to Blastomonasaqua...
A polyphasic taxonomic study was carried out on strain EBR-8-1T isolated from a biofilm reactor in Korea. The cells of the strain were Gram-stain negative, non-spore-forming, non-motile, and short rod-shaped. Comparative 16S rRNA gene sequence studies showed a clear affiliation of this strain with Betaproteobacteria, which showed high pairwise sequ...
A polyphasic taxonomic study was carried out on strain EBR-4-2T isolated from a biofilm reactor in Korea. The cells of the strain were Gram-staining-positive, non-spore-forming, non-motile, and rod-shaped. Comparative 16S rRNA gene sequence studies showed a clear affiliation of this strain with Actinobacteria, which had the highest pairwise sequenc...
Roles of nutrients and other environmental variables in development of cyanobacterial bloom and its toxicity are complex and not well understood. We have monitored the photoautotrophic growth, total microcystin concentration, and microcystins synthetase gene ( mcyA ) expression in lab-grown strains of Microcystis NIES 843 (reference strain), KW (Wa...
Three bacterial strains, designated DS48-6-5T, DS48-6-7 and DS48-6-9, were isolated from a sediment sample taken from Daechung Reservoir at a water depth of 48 meter deep, Republic of Korea. Cells of strains were Gram-stain-negative, aerobic, rod-shaped, and motile with a single polar flagellum. Comparative 16S rRNA gene sequence studies showed thr...
A Gram-stain-positive, aerobic, non-motile, non-spore-forming, and rod-shaped bacterium, designated strain PB158T, was isolated from grass soil sampled in Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies placed the new isolate in the class Actinobacteria, and most closely related to Jatrophihabitans endophyticus S9-650T and Ja...
A polyphasic taxonomic study was carried out on strain EBR-4-1T isolated from a biofilm reactor in Korea. The cells of the strain were Gram-negative, non-spore-forming, motile and rod-shaped. Comparative 16S rRNA gene sequence studies showed a clear affiliation of this strain into the Alphaproteobacteria, which was most closely related to Chelatoco...
Effects of photoperiod were investigated in lab-scale photobioreactors containing algal-bacterial consortia to reduce organic nutrients from municipal wastewater. Under three photoperiod conditions (12 h:12 h, 36 h:12 h, and 60 h:12 h dark-light cycles), nutrient removals and biomass productions were measured along with monitoring microbial populat...
A Gram-stain-positive, aerobic, non-motile, non-spore-forming, cocci-shaped actinobacterium, designated strain EBR4-1-2(T), was isolated from biofilm reactor in Korea. Comparative 16S rRNA gene sequence studies showed the isolate was clearly affiliated with the class Actinobacteria, and most closely related to Flaviflexus huanghaiensis H5(T), showi...
A Gram-negative, aerobic, non-motile, and rod-shaped bacterium, designated strain DS48-5-3(T), was isolated from a 48 m sediment sample taken from Daechung Reservoir, Republic of Korea. Comparative 16S rRNA gene sequence studies showed a clear affiliation of this strain to the Bacteroidetes, notably most closely related to Ferruginibacter alkalilen...
Phenotypic and genotypic changes in Chlamydomonas reinhardtii BafJ5, a starchless mutant,
with respect to lipid metabolism was studied in different trophic states under nitrogen (N) sufficient
and limited conditions. Interestingly, cellular lipid content increased linearly with input acetate
concentration with highest lipid content (~42%) under nit...
A Gram-negative, aerobic, non-motile, non-spore-forming, cocci-shaped, red-pigmented bacterium, designated strain PB-K8(T), was isolated from grass soil sampled in Daejeon, Republic of Korea. Comparative 16S rRNA gene sequence studies showed the isolate was clearly affiliated with the class Alphaproteobacteria, and most closely related to Belnapia...
While it has been known that toxic and non-toxic Microcystis coexist in lakes and their relative proportions vary depending on environmental factors, the main driving force for such variations is still unclear. Therefore, this study attempted to verify the environmental factors related to the dynamics of the abundance of toxic and non-toxic Microcy...
The relative genetic diversity of microcystin-producing Microcystis in the water and sediment of the Daechung Reservoir, Korea, was investigated over an entire year, including the cyanobacterial bloom season. The cells of potentially toxic Microcystis strains containing mcyJ genotypes and cells containing the genus-specific cpcBA gene were quantifi...
The semi-outdoor cultivation of Spirulina platensis was attempted using an underground-water-based medium. Occurrence of contaminant organisms such as Chlorella sp. and Chlamydomonas sp. was not found from a microscopic observation and bacteria were not detected from denaturing gradient gel electrophoresis (DGGE) analysis of PCR-amplified 16S rDNA...
The detection and prevention of cyanobacterial blooms are important issues in water quality management. As such, the diversity
and community dynamics of cyanobacteria during cyanobacterial bloom in the Daechung Reservoir, Korea, were studied by analyzing
the intergenic spacer (IGS) region between phycocyanin subunit genes cpcB and cpcA (cpcBA IGS)....
The detection and prevention of cyanobacterial blooms are important issues in water quality management. As such, the diversity and community dynamics of cyanobacteria during cyanobacterial bloom in the Daechung Reservoir, Korea, were studied by analyzing the intergenic spacer (IGS) region between phycocyanin subunit genes cpcB and cpcA (cpcBA IGS)....
