• 한국어류학회지
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• 제21권sup1호
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• pp.75-75
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• 2009

The previous morphology-based taxonomic frameworks within the family Sygnathidae had emphasized the significance of the male brood pouch and reproductive biology in defining the group. However, several different hypotheses had been proposed by different investigators. This study have beencarried out to determine the phylogenetic relationships among 19 species belonging to the order Syngnathiformes with three Gasterosteiformes species as outgroup taxa by using the mitochondrial cytochrome b and Rag2 nuclear DNA sequences. Phylogenetic analyses based on neighbor-joining distance, maximum parsimony, minimum evolution and maximum likelihood method strongly supported that the family Syngnathidae, the suborder Syngnathoidei and the order Syngnathiformes were all monophyletic group. Much of previous morphological analyses were supported by our molecular data, but some deep relationships were not clearly resolved with regard to members of the suborder Aulostomoidei.

• Animal Systematics, Evolution and Diversity
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• 제8권1호
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• pp.89-106
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• 1992

1983년 7월부터 1991년 7월까지 남한의 각종 담수역 65개 지점에서 채집된 모이나물벼룩류의 표본들을 검토한 결과 한국미기록종 1종을 포함한 3종이 동정되었다. 한국산 Moina속 물벼룩류 4종에 대한 검색표와 함께, 본 연구에서 동정된 3종에 대하여 단위생식하는 암컷 뿐만이 아니라 국내에서 잘 알려져 있지 않았던 수컷 및 휴지란 등을 기재하고 도판을 작성하였다.

• BMB Reports
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• 제29권5호
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• pp.474-480
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• 1996

We present a study of evolutionary changes in expression of actin genes among closely related sea urchin species that exhibit different modes of early development. For this purpose, polyclonal antisera raised against peptides from the carboxyl terminus of the HeCyI cytoskeletal actin of Heliocidaris erythrogramma were used. H. erythrogramma is a direct developing sea urchin that proceeds from embryonic to adult stages without an intervening feeding larval stage. Expression patterns of the CyI actin isoform were compared with those of Heliocidaris tuberculata and to a related sea urchin Strongylocentrotus purpuratus, which both produce a feeding pluteus larval stage. The CyI actin of all three species is expressed in the same cell types. However, its expression patterns have been changed with reorganization of early cell lineage differentiation, which is apparent among the three species. Thus. evolutionary changes in CyI actin gene expression patterns are correlated with not only phylogenetic relationship, but developmental mode. The implication of this observation is that evolutionary changes in expression patterns of histospecific genes may underlie the emergence of novel developmental processes.

• BMB Reports
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• 제41권2호
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• pp.108-111
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• 2008

Some proteins of E. coli are stable at temperatures significantly higher than $49^{\circ}C$, the maximum temperature at which the organism can grow. The heat stability of such proteins would be a property which is inherent to their structures, or it might be acquired by evolution for their specialized functions. In this study, we describe the identification of 17 heat-stable proteins from E. coli. Approximately one-third of these proteins were recognized as having functions in the protection of other proteins against denaturation. These included chaperonin (GroEL and GroES), molecular chaperones (DnaK and FkpA) and peptidyl prolyl isomerases (trigger factor and FkpA). Another common feature was that five of these proteins (GroEL, GroES, Ahpc, RibH and ferritin) have been shown to form a macromolecular structure. These results indicated that the heat stability of certain proteins may have evolved for their specialized functions, allowing them to cope with harsh environments, including high temperatures.

• Molecules and Cells
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• 제28권2호
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• pp.75-80
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• 2009

The cyclic environmental conditions brought about by the 24 h rotation of the earth have allowed the evolution of endogenous circadian clocks that control the temporal alignment of behaviour and physiology, including the uptake and processing of nutrients. Both metabolic and circadian regulatory systems are built upon a complex feedback network connecting centres of the central nervous system and different peripheral tissues. Emerging evidence suggests that circadian clock function is closely linked to metabolic homeostasis and that rhythm disruption can contribute to the development of metabolic disease. At the same time, metabolic processes feed back into the circadian clock, affecting clock gene expression and timing of behaviour. In this review, we summarize the experimental evidence for this bimodal interaction, with a focus on the molecular mechanisms mediating this exchange, and outline the implications for clock-based and metabolic diseases.

• Animal Systematics, Evolution and Diversity
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• 제7권2호
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• pp.225-232
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• 1991

1985년 8월부터 1991년 7월까지 남한의 여러 지점에서 채집된 완보류를 조사한 결과 이 중 7개 지역에서 Cornechiniscus lobatus, Pseudechiniscus junitae, Hypsibius microps, Diphascon prosirostre, Itaquascon trinacriae의 5종의 한국 미기록 종이 발견되었다. 본 미기록 종들에 대하여 기재하고 도판을 작성하였다.

• Animal Systematics, Evolution and Diversity
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• 제7권1호
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• pp.81-100
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• 1991

현생 담수산 패충류에 대한 분류학적 연구로, 남한의 48개 지점에서 채집된 표본을 관찰한 결과 4종의 한국미기록종이 동정되었다. : Cyprinotus uenoi Brehm, 1936, Heterocypris incongruens(Ramdohr, 1808), Dolerocypris fasciata(O.F. Muller, 1776), Dolerocypris sinensis Sars, 1903. 이로써 나한에서는 5종, 2아종의 현생 담수산 패충류가 알려지게 되었다.

• Animal Systematics, Evolution and Diversity
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• 제11권4호
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• pp.497-508
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• 1995

진도에 서식하는 게류의 종류상에 10종(Nobilum japonicum japonicum,Paradorippe granulata, Pilumnus minutus, Carcinoplax vestitus, Eucrate crenata. Uca lactea. Ilyoplax pingi. Nanosesarma gordoni. A Achaeus tubercula tus. Parthenope validus)이 새롭게 추가된다. 과거 진도 근해에서 알려진 36종의 게류를 포함한 총 46종에 대한 분류 목록을 작성하였으며 , 바위 게과 2종인 Hemigrapsus longitarsis와 Sesarma erythrodactyla는 도판 과 함께 재기재 하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.125-125
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• 2012

Graphene was epitaxially grown on a 6H-SiC(0001) substrate by thermal decomposition of SiC under ultrahigh vacuum conditions. Using scanning tunneling microscopy (STM), we monitored the evolution of the graphene growth as a function of the temperature. We found that the evaporation of Si occurred dominantly from the corner of the step rather than on the terrace. A carbon-rich $(6{\sqrt{3}}{\times}6{\sqrt{3}})R30^{\circ}$ layer, monolayer graphene, and bilayer graphene were identified by measuring the roughness, step height, and atomic structures. Defect structures such as nanotubes and scattering defects on the monolayer graphene are also discussed. Furthermore, we confirmed that the Dirac points (ED) of the monolayer and bilayer graphene were clearly resolved by scanning tunneling spectroscopy (STS).

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2000년도 춘계수산관련학회 공동학술대회발표요지집
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• pp.497-498
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• 2000

The venus clam, Ruditapes philippinarum, is an aquaculture shellfish mainly distributed in an intertidal zone of East Asia including Korea, China and Japan. The morphological variation of this species is great. In fact, two of the most popular markers used in molecular evolution, mitochondrial DNA (mtDNA) and nuclear ribosomal DNA (rDNA), have quite different properties, which could translate into different consequences of mutation, drift, migration and selection on patterns of geographical variation and molecular divergence. (omitted)