Korean Ocean Research and Development Institute

About: Korean Ocean Research and Development Institute is a facility organization based out in Busan, South Korea. It is known for research contribution in the topics: Sea surface temperature & Gene. The organization has 1770 authors who have published 3032 publications receiving 50142 citations.

Shewanella donghaensis sp. nov., a psychrophilic, piezosensitive bacterium producing high levels of polyunsaturated fatty acid, isolated from deep-sea sediments.

Abstract: A Gram-negative, motile, rod-shaped, psychrophilic bacterium, LT17T, was isolated from deep-sea sediments (3300 m depth) of the East Sea (Sea of Japan). Optimal growth of LT17T requires the presence of 2.5 % (w/v) NaCl, a pH of 7.0-7.5 and a temperature of 17 degrees C. The isolate grows optimally under a hydrostatic pressure of 10 MPa and growth is possible between 0.1 and <30 MPa. The novel strain is positive in tests for catalase, oxidase, lipase, beta-glucosidase and gelatinase activities and reduces nitrate to nitrate. The predominant cellular fatty acids are iso-C13 : 0, iso-C15 : 0, C16 : 0, C16 : 1omega7 and C20 : 5omega3. The DNA G+C content of strain LT17T is 38.8 mol%. Phylogenetic analysis of 16S rRNA gene sequences places this bacterium in the class Gammaproteobacteria, within the genus Shewanella. The closest relatives of strain LT17T are Shewanella japonica (97.8 % gene sequence similarity), Shewanella pacifica (97.5 %), Shewanella olleyana (96.8 %), Shewanella frigidimarina (96.5 %) and Shewanella gelidimarina (95.4 %). The DNA-DNA hybridization levels between the novel isolate and its closest known phylogenetic relatives, S. japonica and S. pacifica, are lower than 14 %. On the basis of this polyphasic evidence, strain LT17T represents a novel species of the genus Shewanella, for which the name Shewanella donghaensis sp. nov. is proposed. The type strain is LT17T (=KCTC 10635BPT=JCM 12524T).

Lacinutrix algicola sp. nov. and Lacinutrix mariniflava sp. nov., two novel marine alga-associated bacteria and emended description of the genus Lacinutrix

Abstract: Two heterotrophic, aerobic, yellow-pigmented, Gram-negative, non-gliding bacteria, designated AKS293(T) and AKS432(T), isolated from a red alga, were analysed using a polyphasic taxonomic approach. 16S rRNA gene sequence analysis revealed that the novel strains were affiliated to the genus Lacinutrix, a member of the family Flavobacteriaceae, showing sequence similarities of 96.1-96.4 % with respect to the type strain of Lacinutrix copepodicola. The two novel isolates shared 99.5 % 16S rRNA gene sequence similarity and 55.0 % DNA-DNA relatedness. They grew optimally at 17.5 degrees C and pH 6.5. The main cellular fatty acids of strain AKS293(T) were iso-C(15 : 0), iso-C(15 : 0) 3-OH and iso-C(16 : 0) 3-OH, while those of strain AKS432(T) were anteiso-C(15 : 0), iso-C(15 : 0), iso-C(15 : 1) and iso-C(15 : 0) 3-OH. In both cases, the major isoprenoid quinone was MK-6. The DNA G+C contents were 34.7 and 37.0 mol% for strains AKS293(T) and AKS432(T), respectively. The phylogenetic evidence, phenotypic data and DNA-DNA hybridization results support the differentiation of strains AKS293(T) and AKS432(T) from each other and from their closest relative, L. copepodicola DJ3(T). Therefore, strains AKS293(T) and AKS432(T) represent two novel species, for which the names Lacinutrix algicola sp. nov. and Lacinutrix mariniflava sp. nov. are proposed, respectively. The type strain of L. algicola sp. nov. is AKS293(T) (=KCCM 42313(T)=JCM 13825(T)) and the type strain of L. mariniflava sp. nov. is AKS432(T) (=KCCM 42306(T)=JCM 13824(T)). An emended description of the genus Lacinutrix is also proposed.

Acute toxicity of cadmium to eight species of marine amphipod and isopod crustaceans from southern California.

Abstract: Amphipods and isopods are important components of the marine intertidal and subtidal fauna where they are found on or in the substrate or among spaces between larger, attached organisms. However, in spite of their abundance and importance, the use of these two endemic marine groups has been limited in comparison to decapods in marine toxicological research. The purpose of this study was to investigate the effect of a single metallic salt, CdCl/sub 2/, on six species of amphipods and two species of isopods under similar experimental conditions. Cadmium was selected as the toxicant in this comparative study since this metal is an important constituent in municipal wastes discharged into southern California marine waters.

Stability of the Kuroshio path with respect to glacial sea level lowering

Abstract: [1] We investigate the changes of the Kuroshio Current in the East China Sea during the last glacial maximum, based on numerical experiments using an ocean model and geochemical analyses of marine sediments. Our numerical experimental results indicate that there was little effect of sea-level change on the path of the Kuroshio during the glacial period. Geochemical proxy records of marine sediment cores recovered from inside and outside the Okinawa Trough (OT) show no significant difference in glacial sea surface temperature and planktonic foraminiferal δ18O between the OT and the Ryukyu forearc. This indicates that the glacial sea surface temperature and salinity were almost the same inside and outside the OT. Hence, during the glacial period, Kuroshio water most likely intruded into the OT and flowed along the shelf break until it drained out through the Tokara Strait.