• Animal Systematics, Evolution and Diversity
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• v.19 no.1
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• pp.111-117
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• 2003

Some hydromedusae were collected from Shiwhaho (Kyonsgi-do), Korea Strait and Yeosu, Korea during years 2000-2002. They were identified into Sorsia tubulosa (M. Sars, 1835) of the order Anthomedusae, and Liriope tetraphylla (Chamisso and Eysenhardt, 1821) of the order Trachymedusae respectively. They are new to the Korean fauna. The order Trachymedusae is first recorded in Korea. The long tube-like manubrium and four marginal tentacles are characteristics of S. tubuloso. In L. tetraphylla, the four triangle-shaped gonads and their positions upon half of surface of subumbrella, the seven blind centripetal canals in a quadrant and the long fat manubrium are its distinct characteristics. Resulting from this work, the Korean hydromedusae identified so far consist of 13 species of 11 families in five orders.

• Animal Systematics, Evolution and Diversity
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• v.8 no.2
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• pp.279-300
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• 1992

The Korean marine hydrioid fauna identified up to data consists of 120 species of 55 genera in 17 families. Of which Abientiunaria filicula (Ellis and Solander, 1786) is new to the Korean fauna, and the dominant species of hydroids in Korean water is Sertularella miurensis Stechow, 1921 which is collected from 33 points of 96 localities. The coastal waters of Korea are divided into four regions : the East Sea, the South Sea, the Yellow sea and the Chejudo. Concerning the total number of species occured in each region, 43 species in the East Sea, 52 species in the Yellow Sea, 73 species in the South Sea and 83 species in the Chejudo and its vicinity. From the results above described it can be salid that the Chejudo region shows the most diversity of the Korea hydroids. The community coefficient of the East Sea-the Yellow Sea is 0.444, that of the East Sea-the South Sea 0.553, that of the East Sea-Chejudo 0.519, that of the Yellow Sea-the Sea 0.682, that of the Yellow Sea-the Chejudo 0.533 and that of the South Sea-the Chejudo 0.642. So that the zoogeographical relatinship between the Yellow Sea and the South Sea is the highest and between the East Sea and the Yellow Sea is the lowest on the hydroids distribution.

• Animal Systematics, Evolution and Diversity
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• v.12 no.1
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• pp.67-77
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• 1996

Some hydromedusae were collected from the western and southern coasts of Korean Peninsula during May to October, 1995. They were identified into Turritopsis nutricula(McCrady, 1856); Cladonema radiatum Dujardin, 1843; Eirene menoni Kramp, 1953 and Gonionemus vertens A. Agassiz, 1862. Of which the hydromedusa of T. nutricula is preliminary known in Korean waters, and the remainders are new to the Korean fauna.

• Animal Systematics, Evolution and Diversity
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• no.spc1
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• pp.1-52
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• 1986

The known Korean sertularian hydroid fauna consists of 41 species(including Sertularella areyi reported by Rho, 1974) of 10 genera in two subfamilies. Of which 20 species have been previously known and the following 21 species are newly recorded in Korean waters (Dynamena cornicina, Sertularella distans. Sertularella tongensis, Sertularella obtusa, Sertularella tenella, Sertularella pedrensis, Sertularella gayi, Abietinaria traski, Sertularia desmoides, Sertularia turbinata, Thuiaria suensoni, Thuiaria plumosa. Thuiaria thuia, Thuiaria nuttingi, Thuiaria similis, Thuiaria articulata, Thuiaria carica, Selaginopsis triserialis, Selaginopsis cornigera, Selaginopsis trilateralis and Selagiopsis pinnata). They were sampled from the depths below 100m. Of 41 species Sertularellla miurensis is the most common species and 10 species, Dynamena cornicina, Sertularella distans, Sertularella lagenoides, Sertularella areyi, Sertularella pedrensis, Sertularella gayi, Sertularia hattorii, Sertularia turbinata, Thuiaria plumosa and Thuiaria articulata are scarcesly founded in Korean waters. 25 out of 41 species are shared with Japan and the remaining 16 species so far have been unknown from Japan. The coastal waters of Korea are divided into three regions, the East Sea, the South Sea and the Yellow Sea, on the basis of the geographical distribution and the community coefficient. Concerning the distribution in each region, 11 species occur in the East Sea, 39 species in the South Sea and 23 species in the Yellow Sea The community coefficient between the South Sea and Yellow Sea(0.733) is higher than those of the South Sea-the East Sea (0.476) and the East Sea-the Yellow Sea(0.438).

• 발명특허
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• v.5 no.3 s.49
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• pp.38-38
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• 1980

• Journal of the Korean Chemical Society
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• v.53 no.1
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• pp.34-41
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• 2009

A new series of hydrazone derivatives were synthesized from 4-(2-chloroethyl)semicarbazide and their antiproliferative activity against human brain (U251) and liver (Hepg2) carcinoma cell lines were evaluated. The hydrazone compounds are benzaldehyde (2a-2g), acetophenone (3a-3f), and 3-formylindole derivatives (4a-4d). Among the acetophenone derivatives, 3e (p-methoxy substituted) and 3f (p-nitro substituted) showed the highest cytotoxic activity against Hepg2 cell line (I$C_{50}$ = 6 and 8 $\mu$g/ml, respectively). Among the 3-formylindole derivatives, 4a (hydrazone of 3-formylindole itself) showed a pronounced cytotoxic activity against both U251 (I$C_{50}$ = 21 $\mu$g/ml) and Hepg2 (I$C_{50}$ = 7 $\mu$g/ml).

• Animal Systematics, Evolution and Diversity
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• v.20 no.2
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• pp.179-184
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• 2004

Some hydromedusae were collected from the East Sea ($36^{\circ}$30'124'N and $130^{\circ}$06'446'E), Yousu and Youngkwang with horizontal plankton net during from Nov. 2001 to Dec. 2002. They were identified into Proboscidactyla flavicirrata in the order Limnomedusae, and Muggiaea bargmannae and Diphyes bojani in the suborder Calycophorae of the order Siphonophora, respectively. P. flavicirrata is similar with P. stellata in the shape and size, but it is distinguished from later species in that P. stellata has six radial canals, 24 short marginal tentacles and dichotomous branching pattern. The suborder Calycophorae is the first recorded in Korea and posseses only develop a nectosome. In Muggiaea bargmannae, anterior nectophore is simillar with Dimophyes arctica in the shape of nectophore, but it is distinguished from the later in that D. arctica has a undivided mouth plate and deeper hydroecium. In Diphyes bojani, anterior nectophore is simillar with Diphyes dispar in the shape of nectophore, but it is distinguished from the later in which D. dispar has a deeper hydroecium and more prominant dorsal tooth. No posterior nectophores of Muggiaea bargmannae and Diphyes bojani have been observed.

• Animal Systematics, Evolution and Diversity
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• v.20 no.1
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• pp.31-37
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• 2004

Some hydromedusae were collected from the coasts of Seogwipo(Jejudo Island), Hoenggando Island and Ilsanhaesuyokjang(Ulsan), Korea on July 11, 1985; July 23, 1990 and July 16, 1994. They were identified into Aequorea coerulescens (Brandt, 1838) of the order Leptomedusae, and Physalia physalis utriculus La Martiniere, 1829 of the Siphonophora, respectively. The unique morphological characteristics of A. coerulescens are smooth even surface of exumbrella, large mouth with 60 highly fringed oral lobes, shallow stomach, 120 simple radial canals and flat beret-shaped bell. In P. physalis utriculus its morphological characteristics are a triangular large pneumatophore with very low or rudimentary crest, a ribbon like long slender main tentacle, siphon-shaped gastrozooid with mouth, finger-shaped dactylozooid and branched gonozooid with gonophores. P. physalia. utriculus is the Pacific form and distinguished from the Atlantic form, P. p. physalis which has a much larger pneumatophore with high crest, numerous large main tentacles, and compact arrangement of basal and ventral cormidia. As a result of this work the Korean hydromedusan fauna consists of 15 species of five orders.

• Journal of the Korean Chemical Society
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• v.36 no.2
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• pp.311-317
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• 1992

Reaction of 3-alkylidene-2,4-pentanediones(1) with arylhydrazines in methanol afforded 4-acetyl-(2), 4-(1-methoxyalkyl)-(3), or 4-vinylpyrazole derivatives(4). 3-(2,2,2-Trichloroethylidene)-2,4-pentanedione(9) reacted with arylhydrazines to give 4-acetyl-1-aryl-3-methylpyrazoles(11). Possible mechanisms for these reactions were proposed.

• Journal of the Korean Chemical Society
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• v.21 no.4
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• pp.227-234
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• 1977

The reaction of phenylhydrazine with bromine in sulfuric acid solution has been studied kinetically. The pseudo-second-order rate constant is approximately inversely proportional to hydrogen-ion concentration when the concentration of sulfuric acid is lower than 1M. arom the study of the effect of potassium bromide concentration on the rate constant, it is concluded that both neutral bromine and tribromide ion participate in the reaction, the rate constants in 0.01M $H_2SO_4$ being $5{\times}10^5M^{-1},sec^{-1}\;and\;0. 7{\times}10^5M^{-1},sec^{-1}$, respectively at $20^{\circ}C$. The pseudo-second-order rate constant of 2.4-dinitrophenylhydrazine-bromine reaction is independent of hydrogen ion concentration. From the KBr addition experiment, the rate constants for $Br_2\;and\;Br_3^-$ were obtained as $1.2{\times}10^5M^{-1},sec^{-1}\;and\;2.0{\times}10^4M^{-1},sec^{-1}$, respectively.