• Title/Summary/Keyword: commensalism

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Studies on the Commensalism of Peptostreptococcus sp. with the Human Bacterial Flora (Peptostreptococcus sp.와 인체 서식균종과의 편이공생에 관한 연구)

  • 석종성
    • Korean Journal of Microbiology
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    • v.12 no.1
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    • pp.1-14
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    • 1974
  • The strain of Peptostreptococcus sp. S99 used in this study was isolated from the serous discharge of omphalitis of a 6 days old icteric male infant at the Clinical Laboratory of Microbiology, Seoul National University Hospital on June 9, 1973. The purpose of this study is to clarify the commensalism between Peptostreptococcus sp. and the human bacterial flora isolated from clinical specimens with special references to pH.

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Dynamics of Mixed-Cultures of Gluconobacter suboxydans and Saccharomyces uvarum

  • Paik, Hyun-Dong;Oh, Doo-Whan
    • Preventive Nutrition and Food Science
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    • v.2 no.1
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    • pp.66-70
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    • 1997
  • A mixed-culture of Gluconobacter suboxydans IFO 3172 and Saccharomyces uvarum IFO 0751 was per-formed in a synthetic medium. the optimal inculum ratio of G. suboydans and S. uvarum for mixed-culture fermentation was 150:1. The optimum pH, incubation temperature and aeration rate for mixed-culture fer- mentation were 5.0, 3$0^{\circ}C$ and 2.25vvm, reapectively. As a result of batch pure-and mixed-culture fer-mentation, specific growth rate in pure-culture of both strain was lower than that in mixed-culture. The yield of cell mass from S. uvarum exclusively decreased. The growth rate of the mixed-culture was very similar to the pure-culture in the begining of culture, but it has been decreased after 16hrs. In the mean time, S. uvarum in mixed-culture fermentation could grow due to fructose converted, but it could not row in pure-culture fermentation. Thus, the relationship was a sort of commensalism. The kinetic parameters cal-culated through steady-state results during continuous fermentations are as follows :{TEX}$$\mu$_{max1}${/TEX}=0.118({TEX}$h^{-1}${/TEX}), {TEX}$Ks_{1}${/TEX}=0.330(g/L),:{TEX}$$\mu$_{max2}${/TEX}=0.162({TEX}$h^{-1}${/TEX}), {TEX}$Ks_{2}${/TEX}=0.038(g/L). The yield of bacterial cell mass relatively constant, but yield of yest cell mass was gradually decreased.

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New Records of Endocoelantheainea and Nynantheae (Anthozoa: Zoantharia: Actiniaria) from Korea

  • Hwang, Sung-Jin;Song, Jun-Im
    • Animal Systematics, Evolution and Diversity
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    • v.26 no.3
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    • pp.223-232
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    • 2010
  • Actiniarians were collected from the rocks and sand bed of Jejudo Island, Ulleungdo Island, and Wangdolcho in Korean waters from 2004 to 2009. They were classified as two species of two families belonging to the suborders Endocoelantheainea and Nynantheae. Especially, suborder Endocoelantheainea, with distinct development of mesenteries, was firstly added to Korean athenarian fauna with the species, Halcurias carlgreni McMurrich, 1901. Calliactis polypus (Forsk$\aa$l, 1775) showing the commensalism with hermit crab, was easily distinguished from C. japonica by external features and the composition of cnidae. These two species were described in detail with tables and figures.

A Study on Ecology theory and Environment theory Research that is Loocked in Hayao Miyazaki work (미야자키 하야오(宮崎 駿)작품에 투영된 생태론과 환경론 연구)

  • Lee, Seung-Jae
    • Cartoon and Animation Studies
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    • pp.183-209
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    • 2016
  • Hayao Miyazaki's product, , is evaluated that his work until present that product point of view and commercial point of view are highly filled at the same time. Miyazaki's showed new public entertainment possibility in genre that is animation inventing highest-grossing domestic film in Japan's history until it was taken over by another Miyazaki work. Also, it can high evaluate that not that see for interest simply beam about environment and human who writer has to spectator deep self-examination and way of problem pulling comprehension without burden through resected reflex which is not exigent delivery sympathy form. Analyzing his product, , ,, , , , this research allowed purpose to recognize that he present the alternative after arranges intent subject how and institute problem. And do to study whether his though and ideology met with viewpoints of ecologism and environment(environmentalism) in work how. There are his countenance have theme that is certain in Miyazaki director's works. If summarize had handled subject meantime, it is , , , etc. This subjects are that go first at importance order among problems which we face, it is that human desires essentially. If balance of society system that regulate various economical, moral value system and desire to our society is set, our society is that can become little more near in nature mode of life.

Microbiome-Linked Crosstalk in the Gastrointestinal Exposome towards Host Health and Disease

  • Moon, Yuseok
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.19 no.4
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    • pp.221-228
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    • 2016
  • The gastrointestinal exposome represents the integration of all xenobiotic components and host-derived endogenous components affecting the host health, disease progression and ultimately clinical outcomes during the lifespan. The human gut microbiome as a dynamic exposome of commensalism continuously interacts with other exogenous exposome as well as host sentineling components including the immune and neuroendocrine circuit. The composition and diversity of the microbiome are established on the basis of the luminal environment (physical, chemical and biological exposome) and host surveillance at each part of the gastrointestinal lining. Whereas the chemical exposome derived from nutrients and other xenobiotics can influence the dynamics of microbiome community (the stability, diversity, or resilience), the microbiomes reciprocally alter the bioavailability and activities of the chemical exposome in the mucosa. In particular, xenobiotic metabolites by the gut microbial enzymes can be either beneficial or detrimental to the host health although xenobiotics can alter the composition and diversity of the gut microbiome. The integration of the mucosal crosstalk in the exposome determines the fate of microbiome community and host response to the etiologic factors of disease. Therefore, the network between microbiome and other mucosal exposome would provide new insights into the clinical intervention against the mucosal or systemic disorders via regulation of the gut-associated immunological, metabolic, or neuroendocrine system.

Adaptive symbiotic organisms search (SOS) algorithm for structural design optimization

  • Tejani, Ghanshyam G.;Savsani, Vimal J.;Patel, Vivek K.
    • Journal of Computational Design and Engineering
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    • v.3 no.3
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    • pp.226-249
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    • 2016
  • The symbiotic organisms search (SOS) algorithm is an effective metaheuristic developed in 2014, which mimics the symbiotic relationship among the living beings, such as mutualism, commensalism, and parasitism, to survive in the ecosystem. In this study, three modified versions of the SOS algorithm are proposed by introducing adaptive benefit factors in the basic SOS algorithm to improve its efficiency. The basic SOS algorithm only considers benefit factors, whereas the proposed variants of the SOS algorithm, consider effective combinations of adaptive benefit factors and benefit factors to study their competence to lay down a good balance between exploration and exploitation of the search space. The proposed algorithms are tested to suit its applications to the engineering structures subjected to dynamic excitation, which may lead to undesirable vibrations. Structure optimization problems become more challenging if the shape and size variables are taken into account along with the frequency. To check the feasibility and effectiveness of the proposed algorithms, six different planar and space trusses are subjected to experimental analysis. The results obtained using the proposed methods are compared with those obtained using other optimization methods well established in the literature. The results reveal that the adaptive SOS algorithm is more reliable and efficient than the basic SOS algorithm and other state-of-the-art algorithms.

A Study on the Japanese Street Fashion Since the 1990's (1990년대(年代) 이후(以後) 일본(日本)의 스트리트 패션에 관(關)한 연구(硏究))

  • Yum, Hae-Jung
    • Journal of Fashion Business
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    • v.8 no.2
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    • pp.102-115
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    • 2004
  • The purpose of this study is to analyze the various types of styles and characteristics of Japanese street fashion since the 1990's. The primary source of data has been a collection of visual materials which include snapshots of young men and women in the Japanese street scene starting in the 1990's. To approach the Japanese street fashion comprehensively, I have divided the background of the Japanese fashion into three parts: 1. The birth of various fashion markets like the Dankai junior generation, Hetauma generation and Shinjinrui junior generation. 2. The pursuit of fashion senses like the well-balanced sense of independence and commensalism, uncommon sense and sense of a tassel. 3. A boom in new fashion business types like SPA and select shop. After the 1990's, the Japanese street fashion has changed through the popularity of styles which include the conservative casual style, sexy casual style, Harajuku pop style, and 3 Re(revival, remake, recycle) fashion style. The characteristics of the Japanese street fashion reflects the performance of virtual reality, the sign of style culture, and the communication of process.

Characterization of Reactions Taken Place by A Mixed Culture of Lactococcus lactis Cells in Cheese Ripening (치즈숙성과정 중의 Lactococcus lactis 혼합균에 의하여 일어나는 반응들의 특성)

  • 탁건태;김중균
    • Journal of Life Science
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    • v.6 no.1
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    • pp.27-33
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    • 1996
  • Reactions taken place by a mixed culture of Lactococcus lactis subsp. cremoris KH (lac$^{+}$ prt$^{+}$ ) and KHA (lac$^{-}$ prt$^{-}$ ) and KHA (lac prt ) in cheese ripening have been investigated. Growth characteristics of the mixed culture showed commensalism, and the amounts of proteinases of the mixed culture were small enough. From these results, it is concluded that the production of bitter taste by the mixed culture is a small matter, even if the density of the mixed culture is highly maintained during cheese ripening. Hence, the mixed culture of KH and KHA cells could be a good cheese starter in accelerating the process of cheese ripening.

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Presentation for 15th Annual International Magnet Schools of America Conference - Alexis Park Resort & Spa, Las Vegas, Nevada, Thursday, May 1, 1997 (제15차 국제매그넷스쿨컨퍼런스참가/논문발표)

  • Rhyu, Hyang-San
    • Journal of the Korean Institute of Educational Facilities
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    • v.4 no.2
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    • pp.31-36
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    • 1997
  • The Magnet Methodology is not the recording of knowledge, skills, techniques, and other information from the past, but creating a knowledge base using present issues of problems for students' and teachers' life-span development through the exploration of career choices and development. In short, it is the multi-cooperative information system for commensalism. It is the magnet program that connects various level of educational institutions under a certain theme and enables students to choose on their own. And this magnet program is being adminstered by the magnet school. And some regular schools provide magnet program as vocational educations and extra-curricular activities. Magnet program reflects the concept of desegregation which was proposed by the U.S. Federal Court decision against the racial conflict which had culminated in the 60s and 70s. Magnet program enables students to choose their own programs and schools, and gives teachers and students the opportunities to develop their teaching method and learning method. That's why magnet program is called continuous, future-oriented one. Teachers and students can also get fair judgement on their activities due to the voluntary magnet program. It mainly deals with practical issues, so it is very realistic to establish the multi cooperative information system including companies, homes, communities, or governments under these practical issues. The openness of magnet program is guaranteed not only by the characteristics of the program but also by the physical layout of the magnet schools. There are no doors and walls, and classrooms are facing one another and sharing all the opinions and information. This precisely corresponds to the concept of co-existence of eco-system and the interdisciplinary approach which is essential to solve our problems.

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Characterization of Growth-supporting Factors Produced by Geobacillus toebii for the Commensal Thermophile Symbiobacterium toebii

  • Kim, Joong-Jae;Masui, Ryoji;Kuramitsu, Seiki;Seo, Jin-Ho;Kim, Kwang;Sung, Moon-Hee
    • Journal of Microbiology and Biotechnology
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    • v.18 no.3
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    • pp.490-496
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    • 2008
  • Symbiobacterium toebii is a commensal symbiotic thermophile that cannot grow without support from a partner bacterium. We investigated the properties of Symbiobacterium growth-supporting factors (SGSFs) produced by the partner bacterium Geobacillus toebii. SGSFs occurred in both the cell-free extract (CFE) and culture supernatant of G. toebii and might comprise multifarious materials because of their different biological properties. The heavy SGSF contained in the cytosolic component exhibited heat- and proteinase-sensitive proteinaceous properties and had a molecular mass of >50 kDa. In contrast, the light SGSF contained in the extracellular component exhibited heat-stable, proteinase-resistant, nonprotein properties and had a molecular mass of <10 kDa. Under morphological examination using light microscopy, S. toebii cultured with the culture supernatant of G. toebii was filamentous, whereas S. toebii cultured with the CFE of G. toebii was rod-shaped. These results strongly suggest that the SGSFs produced by G. toebii comprise two or more types that differ in their growth-supporting mechanisms, although all support the growth of S. toebii. Upon the examination of the distribution of SGSFs in other bacteria, both cytosolic and extracellular components of Geobacillus kaustophilus, Escherichia coli, and Bacillus subtilis had detectable growth-supporting effects for S. toebii, indicating that common SGSF materials are widely present in various bacterial strains.