2-Methylisoborneol (2-MIB) Excretion by under Low Temperature.

Outbreaks of 2-methylisoborneol (2-MIB) contamination in drinking water sources cause inconvenient odor issues in the water distribution system. In this study, microscopy-based isolation with physiological and molecular phylogenetic characterization were performed to investigate and characterize the 2-MIB odor producers that caused an odor problem in the freshwater system of the North Han River in the autumn of 2018. A benthic cyanobacterium was isolated from 2-MIB odor-issue freshwater samples and was found to be phylogenetically affiliated with (99.

Complete Genome and Plasmid Sequences of Raphidiopsis curvispora Strain GIHE-G1, Isolated from a Drinking Water Reservoir in South Korea.

The complete genome and plasmid sequences of strain GIHE-G1, a coiled filamentous heterocyst-forming cyanobacterium isolated from a drinking water reservoir in South Korea, are reported here. The genome information is expected to improve understanding of this species.

Draft Genome Sequence of Putative 2-Methylisoborneol-Producing Strain GIHE-NHR1, Isolated from the North Han River in South Korea.

The draft genome sequence of GIHE-NHR1, a filamentous cyanobacterium, is reported here. Comparative genome analysis suggests that this strain can produce an odor-causing compound (2-methylisoborneol) in water. The genome information is expected to improve the understanding of the putative 2-methylisoborneol production by the bacterium.

Draft Genome Sequence of Raphidiopsis raciborskii Strain GIHE 2018, Isolated from a Shallow Freshwater Pond in South Korea.

The draft genome sequence of () strain GIHE 2018, a filamentous nitrogen-fixing and potentially harmful cyanobacterium, is reported here. This is the first strain isolated from a shallow freshwater pond in South Korea. This information is expected to improve our understanding of the phylogeography of this species.

General and rare bacterial taxa demonstrating different temporal dynamic patterns in an activated sludge bioreactor.

Temporal variation of general and rare bacterial taxa was investigated using pyrosequencing of 16S rRNA gene from activated sludge samples collected bimonthly for a two-year period. Most of operational taxonomic units (OTUs) were allocated to rare taxa (89.6%), but the rare taxa comprised a small portion of the community in terms of abundance of sequences analyzed (28.

Microbial community analysis and identification of alternative host-specific fecal indicators in fecal and river water samples using pyrosequencing.

It is important to know the comprehensive microbial communities of fecal pollution sources and receiving water bodies for microbial source tracking. Pyrosequencing targeting the V1-V3 hypervariable regions of the 16S rRNA gene was used to investigate the characteristics of bacterial and Bacteroidales communities in major fecal sources and river waters. Diversity analysis indicated that cow feces had the highest diversities in the bacterial and Bacteroidales group followed by the pig sample, with human feces having the lowest value.

Quantitative analysis of human and cow-specific 16S rRNA gene markers for assessment of fecal pollution in river waters by real-time PCR.

The base sequences representing human and cow-specific 16S rRNA gene markers identified in the T-RFLP analysis were recovered from clone libraries. The human and cow-specific primers were designed from these sequences and their specificities were analyzed with fecal DNAs from human, cow, and pig. AllBac primer set showed positive results for all human, cow, and pig samples, while human-specific primer set showed positive result only for human sample but not for cow or pig samples.

Molecular identification of fecal pollution sources in water supplies by host-specific fecal DNA markers and Terminal Restriction Fragment Length Polymorphism profiles of 16S rRNA gene.

Specific fecal DNA markers were investigated for major pollution sources, cow, human, and pig, and occurrence of the identified markers was analyzed in river waters using Terminal Restriction Fragment Length Polymorphism (T-RFLP) techniques and sequencing of 16S rDNA of Bacteroides-Prevotella. The unique and specific DNA markers for cow and human were identified as a 222 bp and 60 bp peak in HaeIII T-RFLP profiles, respectively, and the pig-specific marker was not identified but the unique T-RFLP profile of pig could be used as a substitution. Human-specific marker was detected in most of the river waters tested (92.

Ambient air monitoring of PCDD/Fs and co-PCBs in Gyeonggi-do, Korea.

We started the monitoring for PCDD/Fs in ambient air and soil in August 2001, and co-PCBs in January 2002. Decreasing of PCDD/Fs and co-PCBs levels in ambient air were observed. The higher PCDD/Fs levels were found in winter and lower in autumn.