• 제목/요약/키워드: A-genus

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ON ENTIRE RATIONAL MAPS OF REAL SURFACES

  • Ozan, Yildiray
    • 대한수학회지
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    • 제39권1호
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    • pp.77-89
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    • 2002
  • In this paper, we define for a component $X_{0}$ of a nonsingular compact real algebraic surface X the complex genus of $X_{0}$, denoted by gc($X_{0}$), and use this to prove the nonexistence of nonzero degree entire rational maps f : $X_{0}$ Y provided that gc(Y) > gc($X_{0}$), analogously to the topological category. We construct connected real surfaces of arbitrary topological genus with zero complex genus.

A New Genus, Parkiana Cho, gen. nov. (Lepidoptera: Lecithoceridae) from Madagascar, with Descriptions of Two New Species

  • Cho, Soowon;Koo, Jun-Mo;Agassiz, David J.L.
    • Animal Systematics, Evolution and Diversity
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    • 제36권2호
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    • pp.107-112
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    • 2020
  • A new genus Parkiana Cho, gen. nov., belonging to Torodorinae of Lecithoceridae, is described from Madagascar, with two new species: P. matutinalis Cho & Agassiz, sp. nov. and P. andasibensis Cho & Agassiz, sp. nov. Although superficially similar to Thubdora Park, 2018, some of their morphological characters, such as wing venation, are unique and the species of the genus are grouped apart from Thubdora in a preliminary phylogenetic analysis based on COI barcode sequences. In addition to the specific descriptions, adults and genitalia for the two new species are illustrated.

미토콘드리아 coxIII 유전자 염기서열에 의한 수 종의 한국산 장고말속 식물(녹조식물문)의 계통분류학적 유의성 (A Phylogenetic Significance of Several Species from Genus Cosmarium (Chlorophyta) of Korea Based on Mitochondrial coxIII Gene Sequences)

  • 문병렬;이옥민
    • ALGAE
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    • 제18권3호
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    • pp.199-205
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    • 2003
  • It has been considered that genus Cosmarium including Staurastrum had the problems in grouping by morphological characters. Sequence data for the Cytochrome Oxidase subunit III (coxIII) were employed to compare with taxa of two divisions of this genus, with sections in each, for evaluating the taxonomic stability of these morphological characters. The division and section systems were not coincided with the phylogeny inferred from coxIII sequences, as the previous reports from us using nuclear rDNA ITS and chloroplast rbcL sequence comparisons in this genus. Two taxa of Staurastrum were not placed within a same clade each other, and one taxon of these was grouped in Arthrodesmus clade. Two genera, Cosmarium and Staurastrum, cannot be regarded as monophyletic from this result. Mitochondrial coxIII gene was considered as a useful phylogenetic tool to evaluate evolutionary relationships of desmids as in the case of land plants.

인도네시아에서 수입된 Aquilaria malaccensis 의 감별 연구 (A Study on the Actual Origin Species of Aquilaria malaccensis Imported from Indonesia)

  • 김인락;박병수
    • 대한본초학회지
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    • 제26권1호
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    • pp.97-101
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    • 2011
  • Objectives : The purpose of this research is to identify the actual origin species imported as Aquilaria malaccensis from Indonesia. Methods : After producing the permanent preparat by cutting off the specimen thinly, we observed its characteristics. Results : The imported ones have not interxylary parenchyma, so none is in the genus aquilaria. Since the aliform parenchyma is mostly observed around the vessel pore, they are in the genus gonystylus, and the rest have no aliform parenchyma, so their specimen is unidentified. Conclusion : The imported as A. malaccensis are not in the genus aquilaria, but most of them are in the genus gonystylus and, for the rest, the specimen is unidentified.

A Newly Recorded Genus and Species in Korea, Malthacus angusticollis (Motschulsky) (Cantharidae, Coleoptera)

  • Kang, Tae-Hwa;Lee, Young-Bo;Hwang, Seok-Jo;Park, Hae-Chul
    • International Journal of Industrial Entomology and Biomaterials
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    • 제21권2호
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    • pp.193-195
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    • 2010
  • Both the genus Malthacus Kirby and M. angusticollis (Motschulsky) are reported for the first time in Korea. Five North Korean specimens of M. angusticollis were loaned from Hungarian Natural History Museum, Budapest, Hungary and Sungshin Women's University, Seoul, Korea. Here we provide a key to the genus of the Podabrini in Korea and a diagnosis and taxonomic account of the genus Malthacus and M. angusticollis.

First Record of the Soft-Wing Flower Beetle Genus Kuatunia (Coleoptera: Melyridae) in Korea

  • Lee, Seung-Gyu;Lee, Heejo;Ban, Young-Gyu;Kim, Dong Eon
    • Animal Systematics, Evolution and Diversity
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    • 제36권3호
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    • pp.232-235
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    • 2020
  • The family Melyridae Leach includes more than 300 genera and 6,000 species consisting of four subfamilies (Dasytinae, Malachiinae, Melyrinae, Rhadalinae). Members of the subfamily Malachiinae is distributed all over the world except for New Zealand and prefer warmer, arid or semi-arid regions. Among the malachiine genera, a genus Kuatunia Evers includes 17 species worldwide, mainly distributed in East Asia. In this study, the genus and its described species, Kuatunia oblongula (Kiesenwetter), is newly added to the Korean fauna. A diagnosis, habitus photographs, and illustrations of diagnostic characters are provided, with a key to species of the genus in East Asia.

First report of the lichen Ochrolechia akagiensis (Ochrolechiaceae, Ascomycota) in Korea

  • Park, Jung Shin;Oh, Soon-Ok;Woo, Jeong-Jae;Liu, Dong;Park, Sook-Young;Hur, Jae-Seoun
    • 한국균학회지
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    • 제47권2호
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    • pp.95-104
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    • 2019
  • The genus Ochrolechia is a widespread, lichen genus in Korea. Despite being common, little is known about the species diversity and geographical distribution of Ochrolechia. In this study, we detailed the identification procedure of the genus Ochrolechia in a Korean collection and provided the description of each species. Using 104 specimens collected from 2003 to 2017, we identified four species of the genus Ochrolechia via morphological and/or molecular phylogenetic analysis: O. parellula, O. trochophora, O. yasudae and O. akagiensis. Among them, O. akagiensis had not been previously reported in Korea. Moreover, the species identified as O. frigida and O. tartarea in past studies were corrected as O. yasudae and O. parellula, respectively, based on morphological and/or molecular evidence. Phylogenetic analysis using the internal transcribed spacer regions including 5.8S rRNA gene showed that the four species separated clearly, indicating that the morphological identification corresponds to the phylogenetic identification. We provide a taxonomic key for the four species of the genus Ochrolechia.

ITS 서열에 의한 한국 왕대속 식물종의 계통분류학적 연구 (Phylogenic Study of Genus Phyllostachys (Phyllostachys) in Korea by Internal Transcribed Spacer Sequence (ITS))

  • 이송진;허만규;허홍욱;이병룡
    • 생명과학회지
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    • 제21권9호
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    • pp.1281-1287
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    • 2011
  • 왕대속은 벼과 또는 화본과에 속하는 다년생 목본성 초본이며 아시아의 인도와 중국에 많은 종이 주로 분포한다. 식물에서 속간 속내 계통관계 추론을 위해 널리 이용되고 있는 ITS 부위가 있다. 이 속에 속하는 우리나라 자생 식물 왕대 속내 네 식물종 간 계통 관계를 평가하기 위해 핵 게놈의 ITS 부위로 평가하였다. DNA 서열 배당은 많은 갭(gaps)을 가지고 있었다. 이 속 내 서열 변이는 일부 삽입과 결실이 발견되었고 속내 종간 변이는 자연도태에 의한 것으로 밝혀졌다. 이 속의 오죽과 분죽은 세 계통도(MP, ML, and NJ)에서 모두 같은 분지군을 형성하여 가장 근연관계에 있었다. 기존의 형태학적 특성과 단순 반복 서열(ISSR)의 결과와 유사한 계통 관계를 나타내어 왕대속에서 ITS의 서열이 이들 분류군에 매우 유익한 정보를 제공하고 있음을 시사하였다.

핵 리보솜 DNA ITS 부위에 의한 조팝나무속 식물종의 계통 관계 분석 (Analysis of the Phylogenetic Relationships in the Genus Spiraea Based on the Nuclear Ribosomal DNA ITS Region)

  • 허만규
    • 생명과학회지
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    • 제22권3호
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    • pp.285-292
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    • 2012
  • 조팝나무속(genus Spiraea) 식물은 다년생 목본으로 주로 아시아와 유럽에 분포하고 있다. 한국의 14종을 포함한 전 세계 38분류군에 대해 핵 내 리보솜 전사 서열(ITS)로 이 속의 유전적 관계를 평가하였다. 이 분자생물학적 자료로 분류군의 분지군은 잘 분리되었다. 47 계통(38 분류군: 14개 한국 분류군, 33개 세계 분류군, 9개 중복 분류군). 전체 689 bp 중에서452자리는 절약-정보적이었고, 527자리는 변이를 나타내었으나 절약-비정보적이었고, 159자리는 분류군 전체에서 변이가 전혀 없었다. 비록 계통도에서 잘 분리되었지만 형태적 특성과 지리적 분포와는 일치하지 않았다. 분리되는 자리수는 430이었으며 핵산 다양도(${\pi}$)는 0.281이였다. 중립가설 하에서 Tajima 검증 통계값(D) 은 0.5보다 큰 2.325였다. 따라서 자연 도태가 유전적 변이를 증가시키는 방향으로 작용하고 있었다.