Publications by authors named "Yoon Jung Ju"
Isolation and characterization of the insect growth regulatory substances from actinomycetes.
Comp Biochem Physiol C Toxicol Pharmacol
February 2020
Article Synopsis
- Insect growth regulators (IGRs) are being explored as safer alternatives to traditional insecticides, with actinomycetes potentially offering new compounds for this purpose.
- The study screened 363 actinomycetes and identified Streptomyces sp. AN120537 as the most effective, which produced juvenile hormone antagonists (JHANs) and showed strong insecticidal effects.
- Five active compounds known as antimycins were isolated, demonstrating significant insecticidal activities and causing deformities in treated larvae, indicating their potential application as broad-spectrum IGR insecticides.
A Gram-stain negative, strictly aerobic and non-motile bacterium, designated strain BN130233, was isolated from a soil sample collected from Gyeongsangbuk-do, Republic of Korea. Colonies were orange in colour, with wet and smooth surfaces. Phylogenetic analyses based on the 16S rRNA gene sequences resulted in strain BN130233 forming a cluster with members of the family Chitinophagaceae Kämpfer et al.
View Article and Find Full Text PDFAntibiofilm activity of Streptomyces sp. BFI 230 and Kribbella sp. BFI 1562 against Pseudomonas aeruginosa.
Appl Microbiol Biotechnol
December 2012
Members of the actinomycetes family are a rich source of bioactive compounds including diverse antibiotics. This study sought to identify novel and non-toxic biofilm inhibitors from the actinomycetes library for reducing the biofilm formation of Pseudomonas aeruginosa PAO1. After the screening of 4104 actinomycetes strains, we found that the culture spent medium (1 %, v/v) of Streptomyces sp.
View Article and Find Full Text PDFNocardioides sediminis sp. nov., isolated from a sediment sample.
Int J Syst Evol Microbiol
February 2009
A strictly aerobic, motile, short-rod-shaped, Gram-positive-staining actinomycete strain, designated MSL-01(T), was isolated from a sediment sample from Bigeum Island of Korea. 16S rRNA gene sequence analysis revealed that the isolate MSL-01(T) belonged to the genus Nocardioides, with the highest sequence similarity to Nocardioides terrigena DS-17(T) (98.54 %), but the DNA-DNA relatedness to this type strain was 34 %.
View Article and Find Full Text PDFArticle Synopsis
- A new yellow-pigmented actinobacterium, strain MSL-13T, was isolated from soil on Bigeum Island, Korea, and identified using a multi-faceted taxonomic approach.
- The analysis showed it belongs to the Leifsonia genus, with significant genetic similarities to several known Leifsonia species based on 16S rRNA gene sequences.
- Strain MSL-13T is proposed as a novel species named Leifsonia kribbensis, with a designated type strain classification.
A Gram-positive, short, rod-shaped, cream-coloured actinobacterium, designated MSL-04(T), was isolated from a soil sample collected from an agricultural field on Bigeum Island (Republic of Korea) and was subjected to polyphasic characterization to unravel its taxonomic position. The optimum growth temperature and pH were 28-30 degrees C and pH 7.2-7.
View Article and Find Full Text PDFPhycicoccus bigeumensis sp. nov., a mesophilic actinobacterium isolated from Bigeum Island, Korea.
Int J Syst Evol Microbiol
October 2008
An actinomycete strain, designated MSL-03(T), was isolated from a soil sample collected from Bigeum Island in the Republic of Korea. The coccoid cells of the organism were Gram-positive and non-motile and did not form endospores. The colonies were yellow, small, circular with entire margins and contained meso-diaminopimelic acid as the diagnostic diamino acid in the peptidoglycan.
View Article and Find Full Text PDFArticle Synopsis
- Three new strains of actinobacteria (MSL-09(T), MSL-19(T), MSL-28(T)) were isolated from soil on Bigeum Island, Korea, and found to belong to the genus Nocardioides through 16S rRNA gene analysis.
- All three strains thrive at a pH range of 7.5-9.0 and temperatures between 28-30°C, and share high sequence similarity with known Nocardioides species.
- Based on various taxonomic characteristics, these strains are proposed as three novel species: Nocardioides koreensis, Nocardioides bigeumensis, and Nocardioides agariphilus.
Leifsonia bigeumensis sp. nov., isolated from soil on Bigeum Island, Korea.
Int J Syst Evol Microbiol
August 2008
Article Synopsis
- A new Gram-positive, motile bacterium strain MSL-27T was isolated from soil on Bigeum Island, Korea, forming yellowish-white, glistening colonies.
- The bacterium grows optimally at 28°C and pH 8.0, and it features distinct cellular properties, including non-spore-forming irregular rods that can fragment into shorter rods or coccoid shapes.
- Phylogenetic analysis identified strain MSL-27T as belonging to the genus Leifsonia, proposing it as a new species named Leifsonia bigeumensis sp. nov., based on genetic and biochemical evaluations.
Frigoribacterium mesophilum sp. nov., a mesophilic actinobacterium isolated from Bigeum Island, Korea.
Int J Syst Evol Microbiol
August 2008
A taxonomic study was performed on strain MSL-08T, which was isolated from a soil sample collected from Bigeum Island. The novel isolate was aerobic and Gram-positive. Cells were short and motile rods.
View Article and Find Full Text PDFRubellimicrobium mesophilum sp. nov., a mesophilic, pigmented bacterium isolated from soil.
Int J Syst Evol Microbiol
August 2008
A pink- to light-reddish-pigmented, aerobic, pointed, budding, mesophilic strain designated MSL-20T was isolated from soil from Bigeum island, Korea. The isolate was Gram-negative. Cells were motile rods without flagella.
View Article and Find Full Text PDFNocardioides tritolerans sp. nov., Isolated from soil in Bigeum Island, Korea.
J Microbiol Biotechnol
July 2008
Article Synopsis
- A new Gram-positive strain called MSL-14T was isolated from soil on Bigeum Island, Korea, and studied through various taxonomic methods.
- This strain is strictly aerobic, motile, and grows best at 28°C and pH 7.0, with specific cell wall and fatty acid compositions that are characteristic of its classification.
- Phylogenetic analysis indicates it belongs to the genus Nocardioides, forming a unique lineage, and is proposed to be a new species named Nocardioides tritolerans sp. nov., with strain MSL-14T serving as the type strain.
Article Synopsis
- A new bacterium, named Cryobacterium mesophilum, was discovered in soil from Bigeum Island, South Korea, and is characterized as a Gram-positive, aerobic organism with unique cellular properties.
- The bacterium thrives best at temperatures between 25-28°C and has specific fatty acids, such as anteiso-C15:0 and iso-C16:0, contributing to its cellular structure.
- Phylogenetic analysis shows that Cryobacterium mesophilum is closely related to other members of the Cryobacterium genus, with significant sequence similarity percentages to known species.
Marmoricola bigeumensis sp. nov., a member of the family Nocardioidaceae.
Int J Syst Evol Microbiol
May 2008
Article Synopsis
- A new Gram-positive, aerobic strain, named MSL-05T, was discovered in soil from Bigeum Island, Korea, and classified using various scientific methods.
- The strain has coccoid cells that can grow in a wide range of salt concentrations and prefers temperatures around 28°C and a pH of 7.2, with a specific set of chemotaxonomic characteristics.
- Genetic analysis confirmed its classification within the genus Marmoricola but identified it as a distinct species, which has been named Marmoricola bigeumensis sp. nov., with MSL-05T as its type strain.
Article Synopsis
- A new strain of nonmotile actinobacteria, labeled MSL-11T, was discovered in soil from Bigeum Island, Korea.
- Phylogenetic analysis determined that this strain belongs to the genus Nocardioides, showing a close genetic relationship to Nocardioides jensenii.
- Based on its unique features and genetic data, strain MSL-11T is proposed as a new species called Nocardioides dilutes sp. nov.
A strictly aerobic, Gram-positive, motile, coccoid-shaped, halotolerant actinobacterium (10% NaCl, w/v), designated MSL-23T, was isolated from a soil sample on Bigeum Island, Korea. Results of 16S rRNA gene sequence analysis indicated that the isolate belonged to the genus Nocardioides, with the highest sequence similarity (95.63%) being to Nocardioides kribbensis KCTC 19038T.
View Article and Find Full Text PDFNocardioides islandiensis sp. nov., isolated from soil in Bigeum Island Korea.
Antonie Van Leeuwenhoek
May 2008
Article Synopsis
- Researchers isolated a novel actinobacterium, MSL-26(T), from soil in Bigeum Island, Korea, and determined its classification through a detailed polyphasic study.
- The strain showed similarities to the Nocardioides genus in terms of chemical and morphological traits, optimal growth conditions, and phylogenetic relationships based on 16S rRNA gene sequences.
- Findings led to the conclusion that MSL-26(T) should be classified as a new species, named Nocardioides islandiensis sp. nov., with specific strain designations for future reference.
Bacillus koreensis sp. nov., a spore-forming bacterium, isolated from the rhizosphere of willow roots in Korea.
Int J Syst Evol Microbiol
January 2006
An endospore-forming, rod-shaped bacterium was isolated from the rhizosphere of willow roots in Korea. The bacterium, designated strain BR030T, was a strictly aerobic, motile rod. The cell wall contained type A1gamma peptidoglycan with meso-diaminopimelic acid as the diagnostic diamino acid.
View Article and Find Full Text PDFLentibacillus lacisalsi sp. nov., a moderately halophilic bacterium isolated from a saline lake in China.
Int J Syst Evol Microbiol
September 2005
An aerobic, spore-forming, moderately halophilic bacterium, strain BH260(T), was isolated from a salt lake in China. Cells of this strain were found to be motile rods with flagella. The organism grew optimally at 30-32 degrees C and pH 8.
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