• Animal cells and systems
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• v.4 no.3
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• pp.251-255
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• 2000

Zamolgus cavenularius n. sp. is described from the pennatulacean cnidarian Cavernularia obesa Milne Edwards and Hailme in the Yellow Sea. The new species is readily distinguished from its congeners by the genital doublesomite, mandible, female maxilliped, and other structures. This is the first report on association of a member of Zamolgus with the pennatulacean and the second report on a copepod from the Korean pennatulacean.

• Proceedings of the PSK Conference
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• 2001.10a
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• pp.171.2-172
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• 2001

• Archives of Pharmacal Research
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• v.10 no.4
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• pp.203-207
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• 1987

Sedative principles of the seeds of Zizyphus vulgaris var. sphinosus have been characterized as sanjoinine-A (frangufoline), nuciferine and their congeners. Also, heat treatment of sanjoinine-A-produced a more active artifact, sanjoinine-Ahl, which provides a scientific basis for heat-processing (roasting) of this Oriental medicine.

• Proceedings of the PSK Conference
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• 2002.04a
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• pp.132.3-133
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• 2002

• Animal Systematics, Evolution and Diversity
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• v.19 no.1
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• pp.49-55
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• 2003

The first larval stage of Neocaridina denticulata sinensis (Kemp, 1918) is described and illustrated in detail. The first larvae of N. d. sinensis are compared with those of four other known congeners of Neocoridina from Asia.

• Korean Journal of Environmental Biology
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• v.39 no.2
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• pp.156-159
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• 2021

Arcuphantes catillus n. sp., a new species of the genus Arcuphantes Chamberlin and Ivie, 1943 is described from Korea. The present species is distinguishable from its known similar congeners by a conspicuous proximal process and a blunt lateral process of the paracymbium, feathery tipped lamellar extension of the pseudolamella, and bowl-like posterior part of radix. The present new species was collected from the leaf litter layer of mixed forest on a hillock around rice fields with a pitfall trap.

• Animal Systematics, Evolution and Diversity
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• v.22 no.2
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• pp.145-147
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• 2006

A new species of Baetidae (Ephemeroptera), Procloeon spinosum Nguyen and Bae, is described from Vietnam. The larva of P. spinosum can be distinguished from that of its congeners by the combination of the characters of the 7th gills, which bear spines on the posterobasal margin, and the terminal segment of maxillary palp, which is approximately 1/3 times length of the 2nd segment. The larvae inhabit pools or slow current margins of mountain streams in Northern Vietnam.

• Journal of Microbiology and Biotechnology
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• v.17 no.8
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• pp.1394-1398
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• 2007

Acaricidal activity of the active constituent derived from Pyrus ussuriensis fruits against Dermatophagoides farinae and D. pteronyssinus was examined and compared with that of the commercial benzyl benzoate. The $LD_{50}$ value of the ethyl acetate fraction obtained from the aqueous extract of P. ussuriensis fruits was 9.51 and $8.59{\mu}g/cm^3$ against D. farinae and D. pteronyssinus, respectively. The active constituent was identified as quinone by spectroscopic analyses. On the basis of $LD_{50}$ values with quinone and its congeners, the compound most toxic against D. farinae was quinone ($1.19{\mu}g/cm^3$), followed by quinaldine (1.46), benzyl benzoate (9.32), 4-quinolinol (86.55), quinine (89.16), and 2-quinolinol (91.13). Against D. pteronyssinus, these were quinone ($1.02{\mu}g/cm^3$), followed by quinaldine (1.29), benzyl benzoate (8.54), 4-quinolinol (78.63), quinine (82.33), and 2-quinolinol (86.24). These results indicate that the acaricidal activity of the aqueous extracts can be mostly attributed to quinone. Quinone was about 7.8 and 8.4 times more toxic than benzyl benzoate against D. farinae and D. pteronyssinus. Additionally, quinaldine was about 6.4 and 6.6 times more toxic than benzyl benzoate against D. farinae and D. pteronyssinus, respectively. Furthermore, the skin color of the dust mites was changed from colorless-transparent to dark brown-black by the treatment of quinone. These results indicate that quinone can be very useful as potential control agents, lead compounds, or the indicator of house dust mites.

• Journal of Environmental Science International
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• v.21 no.8
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• pp.891-899
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• 2012

The chlorination pattern of naphthalene vapor when passed through a 1 cm particle bed of 0.5% (mass) copper (II) chloride ($CuCl_2$) mixed with silicon dioxide ($SiO_2$) was studied. Gas streams consisting of 92% (molar) $N_2$, 8% $O_2$ and 0.1% naphthalene vapor were introduced to an isothermal flow reactor containing the $CuCl_2/SiO_2$ particle bed. Chlorination of naphthalene was studied from 100 to $400^{\circ}C$ at a gas velocity of 2.7 cm/s. Mono through hexachlorinated naphthalene congeners were observed at $250^{\circ}C$ whereas a broader distribution of polychlorinated naphthalenes (PCNs) including hepta and octachlorinated naphthalenes was observed at $300^{\circ}C$. PCN production was peak at $250^{\circ}C$ with 3.07% (molar) yield, and monochloronaphthalene (MCN) congeners were the major products at two different temperatures. In order to assess the effect of a residence time on naphthalene chlorination, an experiment was also conducted at $300^{\circ}C$ with a gas velocity of 0.32 cm/s. The degree of naphthalene chlorination increased as a gas velocity decreased.

• Korean Journal of Soil Science and Fertilizer
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• v.45 no.1
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• pp.107-111
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• 2012

Eight marine sediments from Busan port in Korea were annually analyzed to examine the concentration distribution of dioxins from 2006 to 2010. Yearly mean concentration of dioxins ranged from 186.3 to $383.3pg\;g^{-1}$ in real values and 5.087 to 8.541 pg-TEQ (Toxicity equivalency) based on dry weight of samples. The dioxin concentration at the site near fishing market was the highest concentration among all sampling sites. Also the dioxin concentration at the sites with various pollutant sources such as large ships, sewage influx and thermal power station as well as fishing market was higher than that of the sites without specific pollutant sources. Another main factor that affects the dioxin concentration is topography characteristics of the bay. The bay has relatively high dioxin concentration because of the lack of the pollutant diffusion. This study demonstrated that the dioxin concentration in the site with pollutant sources and the lack of the pollutant diffusion was relatively high as compared with the other sites. As a result of contribution ratio of dioxin congeners, OCDD (Octachlorodibenzodioxin) in all sites was major contributor in real value, in contrast, dioxin congeners in TEQ values were dominated by 2,3,4,7,8-PeCDF.