• 제목/요약/키워드: Evolution of Life

검색결과 750건 처리시간 0.022초

First Recorded Family Synopiidae (Crustacea: Amphipoda) from the Korean Waters

  • Kim, Young-Hyo;Heo, Jun-Haeng
    • Animal Systematics, Evolution and Diversity
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    • 제33권3호
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    • pp.162-168
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    • 2017
  • A newly recorded species of gammaridean amphipod, Synopia (Telsosynopia) trifidilla Hughes and Lowry, 2006 belonging to the family Synopiidae Dana, 1853 was collected from the southern Korean coasts. Synopia (Telsosynopia) trifidilla Hughes and Lowry is characterized by the entire telson with a trifid apical margin. The species is described and fully illustrated in the present study. This is the first record of the family Synopiidae from Korea.

First Record of One Sessile Ctenophora, Lyrocteis imperatoris, and Its Embryos from Korea

  • Song, Jun-Im;Hwang, Sung-Jin
    • Animal Systematics, Evolution and Diversity
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    • 제25권3호
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    • pp.255-259
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    • 2009
  • The sessile ctenophores, Lyrocteis imperatoris Komai, 1941 were collected for the first time from Garinyeo, offshore Seogwipo of Jejudo Island by SCUBA diving on June 18, 2009. This species distributed in West North Pacific was newly recorded in Korean waters. Its embryos in various developmental stages were observed in the internal brood chamber.

A Taxonomic Study on Marine Sponges from Chujado Islands, Korea

  • Sim, Chung-Ja;Shim, Eun-Jeong
    • Animal Systematics, Evolution and Diversity
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    • 제22권2호
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    • pp.153-168
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    • 2006
  • A taxonomic study on the marine sponges was conducted with the materials collected from Chujado Island, Korea during the period June 2001 to May 2005 by SCUBA and hands. They were classified into 63 species, 31 genera, 25 families, seven orders in a class. Among them, Antho (Arcania) manarensis Carter, 1880 and Eurypon lendenfeldi Hentschel, 1912 were newly added to Korean Fauna. Two species, Biemna chujaensis and B. jeolmyongensis, were new to science.

우주와 생명의 기원에 대한 신학 전공 대학생의 관점 변화 (Perceptual Change of Undergraduate Students Majored in Theology about the Origins of Universe and Life)

  • 안유민;정재훈;최승언
    • 한국지구과학회지
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    • 제30권3호
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    • pp.317-329
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    • 2009
  • 본 연구는 신학 전공 대학생들과 과학 교육 전공 대학생들과의 비교를 통하여 신학 전공 대학생들의 우주와 생명의 기원에 관련된 관점과 과학에 대한 인식을 알아보며, 신학 전공 대학생들을 대상으로 개설한 현대 과학의 이해와 관련된 과목을 한 학기 수강한 이후에 일어나는 관점의 변화를 살펴보는 것이다. 이를 위해 신학 전공 대학생 26명과 과학교육 전공 대학생 19명이 설문에 참여하였다. 신학 전공 대학생들의 경우, 수강 전 젊은 지구 창조론과 오랜 지구 창조론을 합하여 42%, 유신론적 진화론을 지지하는 응답자는 42%로 나타났으며 생물학적 진화론을 지지하는 응답자는 단 한 명도 없었다. 이에 반해, 과학교육을 전공하는 대학생들 대부분의 진화론을 지지하고 있었으며 극단적인 입장의 창조론을 지지하는 응답자는 없는 것으로 드러났다. 또한 창조론을 지지하는 대부분의 응답자는 과학이 창조주의 업적을 기술하는 도구라고 생각하는 경우가 많았고, 과학적 진화론을 지지하는 응답자는 과학이 자연 세계에 대한 논리적이고 기술적인 체계라는 견해를 가지고 있었다. 신학 전공 대학생들이 현대 과학에 대한 이해와 관련한 과목을 수강한 이후, 젊은 지구 창조론과 같은 극단적 관점을 지지하는 경우가 23%에서 4%로 감소하였으며, 유신론적 진화론의 관점은 다소 증가하였다. 이는 신학 전공 대학생들의 과학 관련 과목 수강이 신학 전공의 바탕에서 과학적 진화론을 이해하려는 실마리를 제공한다고 볼 수 있다.

Gammaropsis utinomii New to Korea (Crustacea: Amphipoda: Photidae)

  • Kim, Young-Hyo;Lee, Kyung-Sook
    • Animal Systematics, Evolution and Diversity
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    • 제26권2호
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    • pp.165-170
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    • 2010
  • Gammaropsis utinomii (Nagata, 1961), an incompletely known species of gammaridean amphipod, is redescribed in detail based on the specimens from the southern coast of Korea. The expanded basis of pereopod 7 of this species allows it to be distinguished from its congeners.

New Records of Three Hydroids (Cnidaria: Hydrozoa) in Korea

  • Park, Jung-Hee
    • Animal Systematics, Evolution and Diversity
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    • 제24권2호
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    • pp.179-183
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    • 2008
  • Some hydroid specimens were collected by SCUBA diving from 10-25 m deep at Uljin (Nagok) and Jejudo Island (Munseom, Beomseom, Supseom). Among the identified species, three species Eudendrium racemosum (Gmelin, 1791), Sertularella diaphana(Allman, 1886) and Schizotricha divergens Naumov, 1960 are new to the Korean fauna.

Performance-based remaining life assessment of reinforced concrete bridge girders

  • Anoop, M.B.;Rao, K. Balaji;Raghuprasad, B.K.
    • Computers and Concrete
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    • 제18권1호
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    • pp.69-97
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    • 2016
  • Performance-based remaining life assessment of reinforced concrete bridge girders, subject to chloride-induced corrosion of reinforcement, is addressed in this paper. Towards this, a methodology that takes into consideration the human judgmental aspects in expert decision making regarding condition state assessment is proposed. The condition of the bridge girder is specified by the assignment of a condition state from a set of predefined condition states, considering both serviceability- and ultimate- limit states, and, the performance of the bridge girder is described using performability measure. A non-homogeneous Markov chain is used for modelling the stochastic evolution of condition state of the bridge girder with time. The thinking process of the expert in condition state assessment is modelled within a probabilistic framework using Brunswikian theory and probabilistic mental models. The remaining life is determined as the time over which the performance of the girder is above the required performance level. The usefulness of the methodology is illustrated through the remaining life assessment of a reinforced concrete T-beam bridge girder.

Analysis of Substitution Events in HIV-1 vif Gene of the Korean Clade

  • Park, Chan-Seung;Kim, Mi-Sook;Yi, Hyun-Ah;Lee, Dong-Hun;Lee, Keon-Myung;Lee, Chan-Hee
    • Journal of Microbiology
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    • 제45권1호
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    • pp.75-78
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    • 2007
  • Nucleotide and amino acid substitution pattern in vif gene of the Korean clade of HIV-1 isolated from Koreans were analyzed using consensus sequences. At nucleotide level, transition/transversion substitution ratio was 1.88, and nonsynonymous/synonymous substitution ratio was 2.67, suggesting a divergent evolution in the Korean clade. At amino acid level, there were 17 substitutions and $G{\rightarrow}E$ substitution at position 37 may be responsible for change in predicted secondary structure.

A Phylogenetic Analysis for Hox Linked Gene Families of Vertebrates

  • Kim, Sun-Woo;Jung, Gi-La;Lee, Jae-Hyoun;Park, Ha-Young;Kim, Chang-Bae
    • Animal cells and systems
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    • 제12권4호
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    • pp.261-267
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    • 2008
  • The human chromosomes 2, 7, 12 and 17 show genomic homology around Hox gene clusters, is taken as evidence that these paralogous gene families might have arisen from a ancestral chromosomal segment through genome duplication events. We have examined protein data from vertebrate and invertebrate genomes to analyze the phylogenetic history of multi-gene families with three or more of their representatives linked to human Hox clusters. Topology comparison based upon statistical significance and information of chromosome location for these genes examined have revealed many of linked genes coduplicated with Hox gene clusters. Most linked genes to Hox clusters share the same evolutionary history and are duplicated in concert with each other. We conclude that gene families linked to Hox clusters may be suggestion of ancient genome duplications.