• Title/Summary/Keyword: Biological evolution

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Study of Connection Process in Distribution systems using Genetic Algorithm (배전계통에서 GA를 이용한 접속변경 순서 결정 방법)

  • Oh, Seon;Seo, Jeong-Kap
    • Journal of Satellite, Information and Communications
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    • v.6 no.1
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    • pp.6-11
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    • 2011
  • In this paper presents a new approach to evaluate reliability indices of electric distribution systems using genetic Algorithm (GA). The use of reliability evaluation is an important aspect of distribution system planning and operation to adjust the reliability level of each area. In this paper, the reliability model is based on the optimal load transferring problem to minimize load generated load point outage in each sub-section. This approach is one of the most difficult procedures and become combination problems. A new approach using GA was developed for this problem. GA is a general purpose optimization technique based on principles inspired from the biological evolution using metaphors of mechanisms such as natural selection, genetic recombination and survival of the fittest. Test results for the model system with 24 nodes 29 branches are reported in the paper.

First Record of Monstrilloid Copepods in Korea: Description of a New Species of the Genus Cymbasoma (Monstrilloida, Monstrillidae)

  • Chang, Cheon-Young
    • Animal Systematics, Evolution and Diversity
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    • v.28 no.2
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    • pp.126-132
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    • 2012
  • A new monstrilloid species belonging to the genus $Cymbasoma$ is described as a preliminary result from nocturnal surveys using a light trap on the east and south coasts of South Korea. Monstrilloid copepods are first recorded in South Korea. $Cymbasoma$ $striifrons$ n. sp. resembles $C.$ $striatum$ (Isaac, 1974) and $C.$ $tumorifrons$ Isaac, 1975 in sharing the character combination of transverse striations on forehead, somewhat small body (generally slightly less or longer than 1 mm), single lobed leg 5 bearing a short medial seta in female, and smooth lateral margin of anal somite without notch and wrinkles. However, $C.$ $striifrons$ n. sp. differs from $C.$ $striatum$ by relatively short and swollen cephalothorax, and rather strongly wrinkled genital somite. $Cymbasoma$ $striifrons$ n. sp. is also distinguished from $C.$ $tumorifrons$ in lacking a rounded protuberance on anterior margin of ventral surface and by relatively short cephalothorax and the number of ventral nipple-like processes on cephalothorax. Herein the new species is described and illustrated, with some comments on the morphological comparison with its allied species.

mtDNA Diversity and Origin of Chinese Mongolian Horses

  • Li, Jinlian;Shi, Youfei;Fan, Caiyun;Manglai, Dugarjaviin
    • Asian-Australasian Journal of Animal Sciences
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    • v.21 no.12
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    • pp.1696-1702
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    • 2008
  • In order to learn the origin of the Chinese Mongolian horse, we analyzed polymorphisms within the mtDNA D-loop variable region in 305 horses of 6 types of 3 different breeds, including one imported breed, one cultivated breed and 4 types of one local breed. We detected 13 different haplotypes, and subsequent sequence analysis showed that all 6 horse types were genetically diverse. By constructing a cladogram of mtDNA D-loop sequences from the 6 horse types along with homologous sequences from several other horse types obtained from GenBank, we showed that Chinese Mongolian horses have a close genetic relationship with other horse types from Mongolia. We also speculate that several Chinese Mongolian horses descended from Przewalskii horse. Additionally, the 13 haplotypes were dispersed throughout the cladogram, suggesting that Chinese Mongolian horses likely originated from multiple female ancestors. A phylogenetic map of the 6 horse types showed that the genetic relationship between the local Wuzhumuqin and Wushen types were the closest. The Xinihe and Baerhu were also closely related to each other, and slightly more distantly related to the cultivated Sanhe breed. All five of the local Chinese horse types had a much more distant relationship with the imported Thoroughbred breed.

Biotoxins for Cancer Therapy

  • Liu, Cui-Cui;Yang, Hao;Zhang, Ling-Ling;Zhang, Qian;Chen, Bo;Wang, Yi
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.12
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    • pp.4753-4758
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    • 2014
  • In recent times, a number of studies have provided evidence that biotoxins present great potential as antitumor agents, such as snake venom, bee venom, some bacteria toxins and plant toxins, and thus could be used as chemotherapeutic agents against tumors. The biodiversity of venoms and toxins make them a unique source from which novel anticancer agent may be developed. Biotoxins, also known as natural toxins, include toxic substances produced by plants, animals and microorganisms. Here, we systematically list representative biological toxins that have antitumor properties, involving animal toxins, plant toxins, mycotoxins as well as bacterial toxins. In this review, we summarize the current knowledge involving biotoxins and the active compounds that have anti-cancer activity to induce cytotoxic, antitumor, immunomodulatory, and apoptotic effects in different tumor cells in vivo or in vitro. We also show insights into the molecular and functional evolution of biotoxins.

Eucyclops serrulatus Species Group (Copepoda: Cyclopoida: Cyclopidae) from Korea (한국산 톱니꼬리검물벼룩 복합군(요각아강, 검물벼룩목, 검물벼룩과)의 분류)

  • Lee Jin Min;Min Gi-Sik;Chang Cheon Young
    • Animal Systematics, Evolution and Diversity
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    • v.21 no.2
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    • pp.137-156
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    • 2005
  • A taxonomic study on the Eucyclops serrulatus species group has been accomplished as one of the serial researches on the freshwater cyclopoid copepods in Korea. As a result, the 'Eucyclops serrulatus', hitherto known from Korea through many reports and papers, turns out to be a species complex of six sibling species: E. serrulatus (Fischer), E. roseus Ishida, E speratus (Lilljeborg), E. pacificus Ishida, E. ohtakai Ishida, and I tsushimensis Ishida Taxonomic accounts on their detailed interspecific discrepancies and intraspecific variabilities are presented. A key to the Eucyclops serrulatus group from the Far East is also provided.

New Animal Phylogeny (새로운 동물계통)

  • Kim, Chang-Bae;Kim, Won
    • Animal Systematics, Evolution and Diversity
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    • v.17 no.2
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    • pp.263-275
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    • 2001
  • Animal phyla in the traditional animal phylogeny were organized into an order of increasing body plan complexity, which was based on the similarities in early embryonic stages. Molecular phylogeny mainly by 18S rRNA data provides recently re-evaluation of the traditional evolutionary scenario. The current molecular-based view of animal relationships strongly suggest the burst of two groups regraded as intermediate grades of body complexity in the traditional concept and displacement of them into higher positions in the tree. The new animal tree provides a framework within new picture of bilaterian ancestor could be drawn, and comparative developmental and genomic data to be interpreted.

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The Ascidians (Tunicata) from Chindo Islands, Korea (진도산 해초류의(Ascidians)의 분류)

  • Boon Jo Rho
    • Animal Systematics, Evolution and Diversity
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    • v.11 no.1
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    • pp.125-145
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    • 1995
  • The study on the classification of the Chindo Islands ascidians was conducted by collecting the specimens from five localities in July and November, 1994 and the previous records. The ascidians were classified into 7 families, 11 genera and 16 species. They are all known species in Korean waters. Among them nine species were found to be new to the Chindo Is. From the standpoint of water forms, the composition of the ascidians from Chindo Is. is made up of three elements, viz., temperate (8species, 50%), temperature-tropical (7 species, 44%) and tropical (1 species, 6%) . A boreal water species and boreal-temperature species were not found . It may be attributable to the fact that the water of this area is warm because of Kuroshio Water Current.

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Acupuncture: How Might the Mechanisms of Treatment Have Contributed to the Diagnosis of "Patterns" and Pattern-based Treatments - Speculations on the Evolution of Acupuncture as a Therapy. Implications for Researchers

  • Birch, Stephen
    • Journal of Acupuncture Research
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    • v.35 no.2
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    • pp.47-51
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    • 2018
  • Acupuncture is a complex intervention that manifests varied theories, treatment methods, diagnostic methods and diagnostic patterns. Traditionally based systems of acupuncture (TBSAs) often have their own diagnostic approaches and patterns. Despite the wide variety that can be found amongst TBSAs, is it possible that they share a common background in clinical observation and practice? Research has shown that multiple physiological pathways and mechanisms can be triggered by different acupuncture techniques and methods. It is highly likely that clinicians will have observed some of the effects of these responses and used those observations as feedback to help construct the patterns of diagnosis and their associated treatments. This review briefly examines this possibility. Pattern identification will have developed out of a complex interaction of factors that include; theories current at the time of their development, historical theories, personal choices and beliefs, training, practice methods, clinical observations and the natural feedback that comes from observing how things change once the treatment is applied. Researchers investigating TBSAs and pattern identification need to be more explicit about the systems they have investigated in order to understand the biological basis of pattern identification and their treatments.

Fast, Flexible Text Search Using Genomic Short-Read Mapping Model

  • Kim, Sung-Hwan;Cho, Hwan-Gue
    • ETRI Journal
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    • v.38 no.3
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    • pp.518-528
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    • 2016
  • The searching of an extensive document database for documents that are locally similar to a given query document, and the subsequent detection of similar regions between such documents, is considered as an essential task in the fields of information retrieval and data management. In this paper, we present a framework for such a task. The proposed framework employs the method of short-read mapping, which is used in bioinformatics to reveal similarities between genomic sequences. In this paper, documents are considered biological objects; consequently, edit operations between locally similar documents are viewed as an evolutionary process. Accordingly, we are able to apply the method of evolution tracing in the detection of similar regions between documents. In addition, we propose heuristic methods to address issues associated with the different stages of the proposed framework, for example, a frequency-based fragment ordering method and a locality-aware interval aggregation method. Extensive experiments covering various scenarios related to the search of an extensive document database for documents that are locally similar to a given query document are considered, and the results indicate that the proposed framework outperforms existing methods.

Transposable Elements in Magnaporthe Species (도열병균의 Transposable elements)

  • Chi, Myoung-Hwan;Park, Sook-Young
    • Research in Plant Disease
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    • v.24 no.2
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    • pp.87-98
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    • 2018
  • The fungal species contain diverse transposable elements and repetitive sequences up to ~10% of their genome. It has been reported that distribution of transposable elements tends to correlate with the host range of the pathogen. Moreover, transposable elements cause the loss of an avirulence gene in the pathogen, which resulted in disease on a resistance cultivar. Thus, the transposable elements in the fungal pathogens may be one of the key factors driving the plant-fungus interactive evolution. In this article, we reviewed classification and biological functions of transposable elements in Magnaporthe species.