• Mycobiology
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• v.44 no.4
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• pp.335-337
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• 2016

During the growing season of 2015, leaf specimens with yellow rust spots were collected from Salix koreensis Andersson, known as Korean willow, in riverine areas in Cheonan, Korea. The fungus on S. koreensis was identified as the rust species, Melampsora yezoensis, based on the morphology of urediniospores observed by light and scanning electron microscopy, and the molecular properties of the internal transcribed spacer rDNA region. Pathogenicity tests confirmed that the urediniospores are the causal agent of the rust symptoms on the leaves and young stems of S. koreensis. Here, we report a new rust disease of S. koreensis caused by the rust fungus, M. yezoensis, a previously unrecorded rust pathogen in Korea.

• The Korean Journal of Ecology
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• v.6 no.4
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• pp.10-20
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• 1983

Morphological and ecological comparions are made between specimens of Cobitis koreensis KIM and the geographically restricted population of the Cobitid fish which is found along the Begchon stream, Puangun, Cholla-bugdo province over a 12-month period of 1982 and 1983. The Begchon population is tentatively identified as Cobitis koreensis, but the color patterns and two morphometric proportions differ widely fromthose reported previously for this species. In addition to these character, it is easily distinguished from C. koreensis by the smaller body size, by having the larger egg size and the less egg number in female during the breeding season. As the differentiation of this population is primarily due to geographically isolation, it is supposed that Begchon cobitid population may be an undescribed distinct subspecies of K. koreensis or above the conventional subspecies level.

• Korean Journal of Ichthyology
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• v.19 no.4
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• pp.286-291
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• 2007

The bitterling, Acheilognathus koreensis spermatozoon has been examined by electron microscopy. The epididymal spermatozoa of A. koreensis are representing typical characteristic of cyprinid spermatozoa including the lateral insertion of flagellum, the organization of centriolar complex in shallow nuclear fossa and the asymmetrical arrangement of mitochondria. The sperm mid-piece contains a large mitochondrion characteristic enclosed by membranous vesicles. The mitochondria aspect is different from that of other cyprinid spermatozoa, which their mitochondria have a conventional aspect and never fuse to form a mitochondrial derivative. In term of sperm evolution, the fused mitochondria are regarded as the apomorphic character in comparison with the separate mitochondria. The single mitochondrion is not found in cyprinid spermatozoon except for Rodeus and Pungtungia.

• Animal Systematics, Evolution and Diversity
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• v.33 no.2
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• pp.136-139
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• 2017

The genus Iksookimia (Actinopterygii: Cypriniformes: Cobitidae) is a bottom-dwelling freshwater loaches, which are well-known as their endemism and high geographic variation. However, population genetic relationships among Iksookimia spp. have remained unclear due to a shortage of genetic markers that can be applied generally in the genus. Here, we developed high-resolving microsatellite markers using I. koreensis and I. longicorpa as representatives of Iksookimia species because of their wide distribution range and phylogenetic position. Ten of polymorphic microsatellite loci were isolated from Iksookimia koreensis and were successfully cross-amplified in I. longicorpa. The mean number of observed alleles per locus was about 10.4 (range, 2-17) for I. koreensis and about 13.2 (range, 2-24) for I. longicorpa. The loci, IK03 and IK08, deviated from the Hardy-Weinberg equilibrium in I. koreensis, after applying the Bonferroni correction. The microsatellite markers obtained in the present study will be useful to evaluate population genetic structure and to establish conservation strategies for I. koreensis and related Iksookimia species.

• Korean Journal of Ichthyology
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• v.23 no.2
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• pp.150-157
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• 2011

In this study we described reproduction study of Korean endemic species, Acheilognathus koreensis and three other acheilognathinae species A. signifer, Rhodeus pseudosericeus, and R. uyekii. Morphology of egg shape and larvae just hatched is unique by the species respectively. There is no interrelation factor between size of female and number of spawned eggs per one time. Minium water temperature for spawning of A. koreensis was observed in $13.0^{\circ}C$ having low hatching rate with 43.5 percent. The egg of A. koreensis began to hatch approximately 79 hours after insemination. As higher as water temperature until $22.0^{\circ}C$ hatching elapsed time for developing eggs of A. koreensis and three species in this study was shortened. A. koreensis was grew up to be a adult enough which can be join to new production for three hundred days after hatching with 52.4 mm in total length. This reproduction study will be applied to preservation of Korean endemic fresh water fishes basically.

• The Korean Journal of Zoology
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• v.32 no.3
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• pp.242-251
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• 1989

Morphometric and genetic analyses on six populations of the two subspecies of Cobitis koreensis were performed to investigate the geographic variation and to clarify their taxonomic status. No significant differences between subspecies were found. Puan population of C. k. pumilus tends to be smaller in numbers of cross bars and dorsal spots, than those of C. k. koreensis populations with no statistical significance. Average degree of genic variation among six populations of the two subspecies was A=1.5, P =37.3%, HD=0.053, and HG=0.097. Marginal populations of Samchog (C. k. koreensis) and Puan(C. k. pumilus) were least variable: A= 1.3, P=23.8%, HD=0.0l0, HG=0.043, and A= 1.2, P=19.0%, HD=0.029, HG=0.078 respectively.The difference between HD and HG in all populations may indicate a patchness distribution between demes within each population. Genetic similarities between the two subspecies were, on the average, S=0.894, and this value correspond to the average genetic similarities among five populations of C. k. koreensis (5=0.899). Chongup population of C. k. koreensis and Puan population of C. k. pumilus was most similar genetically (5 =0.931). The results of morphometric and genetic analysis in this study indicate that C. k. pumilus is not a valid subspecies and should be considered as a population of C. koreensis.

• Korean Journal of Agricultural Science
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• v.43 no.3
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• pp.415-423
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• 2016

This study was carried out to obtain basic data for the industrial use of Weissella koreensis and Lactobacillus sakei. The antibacterial activity of supernatants obtained from W. koreensis and L. sakei were tested against pathogenic bacteria such as Escherichia coli KCCM 11234, Salmonella enteritidis KCCM 3313, Salmonella enteritidis KCCM 12021, Salmonella typhimurium KCCM 40253, and Salmonella typhimurium KCCM 15. The supernatant of L. sakei showed antibacterial activity against E. coli KCCM 11234, S. enteritidis KCCM 12021, and S. typhimurium KCCM 15, while the supernatant of W. koreensis showed antibacterial activity against E. coli KCCM 11234 and S. enteritidis KCCM 12021. The effect of pH changes and heat treatment on antibacterial activity of the supernatants was examined using the sensitive pathogenic bacteria (E. coli KCCM 11234, S. enteritidis KCCM 12021 and S. typhimurium KCCM 15). Antibacterial activity against sensitive pathogenic bacteria was maintained under heat treatment at all temperatures, but there was no antibacterial activity associated with pH modification. Furthermore, it was confirmed that the antibacterial activity of the supernatants obtained from W. koreensis and L. sakei was a result of organic acids including, lactic, acetic, phosphoric, succinic, pyroglutamic, citric, malic, and formic acids. Therefore, the present study showed that the organic acids produced by L. sakei and W. koreensis exhibited a strong antibacterial activity against pathogenic bacteria. Moreover, in the food industry, these organic acids have the potential to inhibit the growth of pathogenic bacteria and improve the quality of stored food.

• Parasites, Hosts and Diseases
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• v.59 no.6
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• pp.645-649
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• 2021

Total 513 heterophyid flukes were collected from a carcass of wild Korean raccoon dog, Nyctereutes procyonoides koreensis, in Korea. With morphological and molecular characteristics, the flukes were identified to Cryptocotyle lata. The adult C. lata were minute, transparent, pentagonal, 522 ㎛ long by 425 ㎛ wide. Ceca extended into post-testicular region. Ventrogenital sac elliptical, 79 ㎛ by 87 ㎛ with genital pore and ventral sucker. Two testes semielliptical and slightly lobed, located in the posterior region, right testis 173 ㎛ by 155 ㎛, left testis 130 ㎛ by 134 ㎛. In a phylogenetic tree, the fluke specimen of this study was grouped with C. lata divergent from Cryptocotyle lingua. We report here N. procyonoides koreensis first as a natural definitive host of C. lata.

• Microbiology and Biotechnology Letters
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• v.51 no.1
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• pp.128-131
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• 2023

Here we report the draft genome sequence of Weissella koreensis strain HJ and genomic analysis of its key features. The genome consists of 1,427,571 bp with a GC content of 35.5%, and comprises 1,376 coding genes. In silico analysis revealed the absence of pathogenic factors within the genome. The genome harbors several genes that play an important role in the survival of the gastrointestinal tract. In addition, a type III polyketide synthase cluster was identified. Pangenome analysis identified 68 unique genes in W. koreensis strain HJ. The genome information of this strain provides the basis for understanding its probiotic properties.

• Microbiology and Biotechnology Letters
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• v.52 no.1
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• pp.91-93
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• 2024

Weissella koreensis DMW12 was isolated from kimchi added Myeongtae (Theragra chalcogramma), and its complete genome sequence was determined. The complete genome of strain DMW12 includes a single circular 1,518,288-bp chromosome without plasmids. The G+C content of the genome is 35.6 mol%. Although strain DMW12 did not showed protease and lipase activities, the genome includes 33 protease- and 3 lipase-encoding genes. The genome of strain DMW12 does not include acquired antibiotic resistance genes against ampicillin, chloramphenicol, clindamycin, erythromycin, gentamicin, kanamycin, tetracycline, and streptomycin.