• 제목/요약/키워드: Microbe

검색결과 418건 처리시간 0.025초

생지구화학적 광물변이작용 연구에서 전자에너지 손실 분광 분석 - 스펙트럼 영상법의 활용 (Application of Electron Energy Loss Spectroscopy - Spectrum Imaging (EELS-SI) for Microbe-mineral Interaction)

  • 양기호;박한범;김진욱
    • 한국광물학회지
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    • 제32권1호
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    • pp.63-69
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    • 2019
  • 광물 구조에 분포하는 철의 산화수 정보는 유 무기적 퇴적광물형성 시 산화환원 조건 등 과거 퇴적 환경에 대한 정보를 제공한다. 특히, 생광물화작용에서 미생물의 역할을 규명하기 위해서는 고분해능 투과 전자현미경(HRTEM) 및 전자에너지 손실 분광기(EELS)를 활용한 나노스케일 분석이 필요하다. HRTEM-EELS를 이용한 광물구조 내 철의 산화수 및 탄소 결합 구조 분석, Fe(II)/Fe(III) 및 탄소 기원 분포영상으로부터 광물생성의 생물학적 요소를 판별할 수 있다. 이와 같은 나노스케일 분석을 통하여 지질미생물학자들은 미생물-광물작용의 증거를 직접적으로 얻을 수 있다.

Paramyrothecium eichhorniae sp. nov., Causing Leaf Blight Disease of Water Hyacinth from Thailand

  • Pinruan, Umpawa;Unartngam, Jintana;Unartngam, Arm;Piyaboon, Orawan;Sommai, Sujinda;Khamsuntorn, Phongsawat
    • Mycobiology
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    • 제50권1호
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    • pp.12-19
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    • 2022
  • Paramyrothecium eichhorniae sp. nov. was observed and collected from Chiang Mai and Phetchaburi Provinces, Thailand. This new species is introduced based on morphological and molecular evidence. This fungus is characterized by its production of sporodochium conidiomata with a white setose fringe surrounding an olivaceous green to dark green slimy mass of conidia, penicillately branched conidiophores, and aseptate and cylindrical to ellipsoid conidia. Phylogenetic analyses of combined LSU rDNA, ITS rDNA, tef1, rpb2, tub2 and cmdA sequence data using maximum parsimony, maximum likelihood and Bayesian approaches placed the fungus in a strongly supported clade with other Paramyrothecium species in Stachybotryaceae (Hypocreales, Sordariomycetes). The descriptions of the species are accompanied by illustrations of morphological features, and a discussion of the related taxa is presented.

소 체외수정란 생산에 있어 미생물 제어에 관한 연구 (Studies on the Microbe Control at Bovine Embryo Production by In Vitro Fertilization)

  • 이명식;고응규;임기순;장원경;양보석;오성종;박용윤
    • 한국가축번식학회지
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    • 제19권2호
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    • pp.153-157
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    • 1995
  • These studies were conducted to investigate the microbe control effect of antibiotics treatment in all media used for in vitro fertilization(IVF) embryo production. The bovine oocytes were recovered from follicles(2~5mm) and were cultrued for 22hrs at 38.5$^{\circ}C$ with 5% CO2 incubator. The contamination and development rate in vitro fertilized oocyte was evaluated everyday. The results were summerized as follow ; 1. Control, antibiotic-antimycotic solution(AAS, Gibco) 1%+gentamycin, and AAS 1%+kanamycin(Sigma, USA) treatment was contaminated with 72hrs. However Baytril and Kanamycin(Korea) added was not contaminated. 2. The blastocyst formation rate in Baytril supplementated 1, 2 and 3${mu}ell$/ml was 3.73, 1.28 and 0.00%, respectively. 3. The blastocyst formation in kanamycin added concentration of 50, 75 and 100$\mu\textrm{g}$/ml was 13.0, 9.4 and 3.49%, respectively.

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통계방법에 의한 하수처리장 운전분석 (Analysis of Sewage Plant Operation by Statistical Approach)

  • 이찬형;문경숙
    • 한국환경보건학회지
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    • 제28권3호
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    • pp.34-38
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    • 2002
  • Statistical analysis between sewage plant operating parameters and the effluent quality was performed. We extracted two factors from principal component analysis of operating parameters and effluent quality from each plant. The total variance of 84.7%, 79.2% was explained by the two factors at SB plant and SC plant, respectively. The factors were identified at SB plant in the following order 1) the oxidation of organic material by aeration basin microbe,2) biomass in aeration basin and at SC plant 1) the oxidation of organic material by aeration basin microbe, 2) thickening of acti-vated sludge. These results suggested that the control of microbial composition might be critical on the improvement of the effluent quality and plant operating efficiency because most of the factors were related with microbes.

초임계 이산화탄소를 이용한 쑥 추출물의 항균효과에 관한 연구 (A Study on the Antimicrobial Effect of Natural Artemisia Extract using Super Critical Carbon Dioxide)

  • 성기천
    • 한국응용과학기술학회지
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    • 제20권4호
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    • pp.309-315
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    • 2003
  • Extraction of Natural Artemisia by using super critical carbon dioxide is operated under $40-50^{\circ}C$ and 200-250 atm, thus, conversion rate is very low as 7wt% while high energy is being wasted. When Natural Artemisia Extract is applied in the control of microbe, concentration and reaction time greatly affected to the growth of microbe. Especially, when refined oil concentration from Natural Artemisia added more than 1,000ppm, staphylococcus aureus and fungi are terminated completely. Thus, it is proven that Natural Artemisia Extract has antimicrobial effect.