• Title/Summary/Keyword: Ferric nitrate

Search Result 41, Processing Time 0.034 seconds

Metabolic Characterization of Lactic Acid Bacterium Lactococcus garvieae sk11, Capable of Reducing Ferric Iron, Nitrate, and Fumarate

  • Yun, Su-Hee;Hwang, Tae-Sik;Park, Doo-Hyun
    • Journal of Microbiology and Biotechnology
    • /
    • v.17 no.2
    • /
    • pp.218-225
    • /
    • 2007
  • A lactic acid bacterium capable of anaerobic respiration was isolated from soil with ferric iron-containing glucose basal medium and identified as L. garvieae by using 16S rDNA sequence homology. The isolate reduced ferric iron, nitrate, and fumarate to ferrous iron, nitrite, and succinate, respectively, under anaerobic $N_2$ atmosphere. Growth of the isolate was increased about 30-39% in glucose basal medium containing nitrate and fumarate, but not in the medium containing ferric iron. Specifically, metabolic reduction of nitrate and fumarate is thought to be controlled by the specific genes fnr, encoding FNR-like protein, and nir, regulating fumarate-nitrate reductase. Reduction activity of ferric iron by the isolate was estimated physiologically, enzymologically, and electrochemically. The results obtained led us to propose that the isolate metabolized nitrate and fumarate as an electron acceptor and has specific enzymes capable of reducing ferric iron in coupling with anaerobic respiration.

Adsorption of $\alpha$-Fe2O3 on the Surface of Mica Particles (운모표면에 대한 $\alpha$산화철 흡착)

  • 김대웅;조동희;김명숙;박면용
    • Journal of the Korean Ceramic Society
    • /
    • v.24 no.3
    • /
    • pp.215-222
    • /
    • 1987
  • ${\alpha}$-Ferric Hydrous Oxide and ${\alpha}$-Ferric Oxide were obtained as following processes that Ferric Nitrate solution was adjusted to pH 6-8 with Ammonium Hydroxide, refluxed the Iron precipitate for 1 hr. at 80$^{\circ}C$, washed it with water and Methanol (95%), dried it to obtain ${\alpha}$-Ferric Hydrous Oxide at 60$^{\circ}C$, and then heated in atmosphere to prepare ${\alpha}$-Ferric Oxide for 1 hr. at 450$^{\circ}C$. Mica particles cleaned with ultrasonicator (45KHz) in water were mixed with Ferric Nitrate solution and treated it to adsorb ${\alpha}$-Ferric Oxide on the surface of mica particles by using the abovementioned processes, but the heated temperature was at 500$^{\circ}C$. The maximum wavelength of reflected light on the surface of mica-${\alpha}$-Ferric Oxide (50%) was appeared at 546nm but -Ferric Oxide free mica only was at 436 nm. The maximum wavelength was shifted to longer when the weight ratios of ${\alpha}$-Ferric Oxide to mica was changed from 1% to 50%.

  • PDF

Synthesis of ${\alpha}-Fe_2O_3$ Powders by the Polymerized Complex Method (Polymerized Complex법에 의한 ${\alpha}-Fe_2O_3$ 분말의 제조)

  • 강경원;정용선;오근호
    • Journal of the Korean Ceramic Society
    • /
    • v.35 no.3
    • /
    • pp.239-244
    • /
    • 1998
  • Iron complexes were prepared using ferric nitrate and ethylene glycol as starting materials and the ul-trafine ${\alpha}-Fe_2O_3$ particles with the sizes smaller than 200nm were obtained by the pyrolysis of iron com-plexes at over $350^{\circ}C$ In addition the decomposition mechanism of the synthesized iron complexes was in-vestigated by differential scanning calorimeter X-ray diffractometer and IR spectrometer. Transmission electron microscopy and BET method were performed to analyze the effects of ferric nitrate contents and reaction temperatures on the size and shape of the particles.

  • PDF

질산염이 Saccharomyces cerevisiae의 발효작용에 미치는 영향

  • 김상준
    • Proceedings of the Korean Society for Applied Microbiology Conference
    • /
    • 1979.04a
    • /
    • pp.115.3-115
    • /
    • 1979
  • 중금속을 함유한 13종의 질산염을 명 농도별로 첨가하여 주정효모 Saccharomyces cerevisine의 주정생산과 발효작용에 미치는 영향을 조사하였다. 1. 일반적으로 중금속을 함유한 질산염은 그 첨가량이 0.0001mo1. 보다 고농도일수록 Saccharo-myces cerevisiae의 발효작용을 점차 억제하였다. 2. Nickel nitrate, chromium nitrate들의 0.0001 moi.의 첨가는 Saccharomyces cerevisiae의 alcohol 발효작용을 약간촉진시켰다. 3. Cadmium nitrate 0.001mo1. 이상, cupric nit-rate, nickel nitrate, cobalt nitrate 0.01mo1. 이상, 그리고 silver nitrate, mercurous nitrate, manganese nitrate, zinc nitrate, lead nitrate, chromiun nitrate, ferric nitrate, bismuth nitrate 0.1mol. 의 농도에서 Saccharomyces cerevisiae 의 발효작용은 완전히 조지되었다.

  • PDF

Adsorption of Hydrogen Sulfide on Surface Modified Activated Carbon using Ferric Nitrate (질산철을 이용하여 표면개질된 활성탄의 황화수소 흡착)

  • Jeong, Moonjoo;Lee, Seongwoo;Kim, Daekeun
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.31 no.2
    • /
    • pp.173-180
    • /
    • 2015
  • The purpose of this study was to fabricate a ferric nitrate impregnated activated carbon, and the performance for hydrogen sulfide by adsorption was evaluated. Sodium hydroxide was utilized to control pH in the process during generation of ferric hydroxide on the surface of the carbon. Critical mixing duration for generation of ferric hydroxide on the carbon was 48 hrs at pH 1 of the solution, in which the chemical adsorption of hydrogen sulfide was enhanced. The adsorption capacity of the impregnated carbon increased up to 0.10 g hydrogen sulfide/g carbon, which was 4.3 times higher than that of the raw carbon. Presence of FeOOH on the surface of the impregnated carbon was examined by X-ray diffraction.

EFFECT OF CUPRIC AND FERRIC IONS ON BONDING OF MMA/TBBO RESIN TO DENTIN (동 및 철이온이 MMA/TBBO레진의 상아질 접착에 미치는 영향)

  • Park, Jin-Hoon
    • Restorative Dentistry and Endodontics
    • /
    • v.18 no.2
    • /
    • pp.423-430
    • /
    • 1993
  • The purpose of this study was to investigate the effect of ferric and ferric ions contained in phosphoric acid solution as a pretreatment solution on bonding of MMA/TBBO resin to dentin. Each of 1 % and 3 % ferric chloride. cupric chloride. cupric sulfate. and cupric nitrate was mixed into 10% phosphoric acid solution and pretreated dentin surface of bovine anterior teeth for 30 seconds followed- by water rinse and dry. Tensile bond strength was determined after bonding of pretreated dentin with MMA/TBBO resin by use of brush-on ;technique and storing for 24 hours in 3it distilled water. The amount of cupric ions adsorbed on pretreated dentin surface was detected by Wave-Dispersion X-ray microanalyzer for different groups of each pretreatment solution containing cupric salts. The pretreatment with cupric ions contained in 10% phosphoric acid solution was effective to increase bonding strength of MMA/TBBO resin to dentin but not in case of ferric ions. The pretreatment with 3 % cupric chloride and cupric nitrate both enhanced significant increase in bonding strength compared to the control group of 10% phosphoric acid solution(p<0.05). Cupric ions measured in pretreated dentin surface was higher in 3 % cupric chloride group than in 1% cupric chloride group, but couldn't find distinct relationship from the results of this experiment between the amount of adsorbed cupric ions according to the kind of cupric salts and the bonding strength value.

  • PDF

Study on the Effect of Iron-based Metal Catalysts on the Thermal Decomposition Behavior of ABS (Iron계 금속 촉매가 ABS의 열분해 거동에 미치는 영향에 관한 연구)

  • Jang, Junwon;Kim, Jin-Hwan;Bae, Jin-Young
    • Applied Chemistry for Engineering
    • /
    • v.16 no.4
    • /
    • pp.496-501
    • /
    • 2005
  • The thermal degradation of ABS in the presence of iron-based metal catalysts has been studied by thermogravimetric analysis (TGA). The reaction of iron-based metal catalysts (ferric nitrate nonahydrate, ammonium ferric sulfate dodecahydrate, iron sulfate hydrate, ammonium ferric oxalate, iron(II) acetate, iron(II) acetylacetonate and ferric chloride) with ABS has been found to occur during the thermal degradation of ABS. In a nitrogen atmosphere, char formation was observed, and at $600^{\circ}C$ approximately 3~23 wt% of the reaction product was non-volatile char. The resulting enhancement of char formation in a nitrogen atmosphere has been primarily due to the catalytic crosslinking effect of iron-based metal catalysts. On the other hand, char formation of ABS in air at high temperature by iron-based metal catalyst was unsuccessful due to the oxidative degradation of the char.

Bioconversion of nitrogen oxides and reduction of ferric ions by probiotic lactic acid bacteria (프로바이오틱스 유산균에 의한 질소 산화물 전환 및 철 이온 환원활성)

  • Kim, Selim;Hong, Jungil
    • Korean Journal of Food Science and Technology
    • /
    • v.53 no.6
    • /
    • pp.785-791
    • /
    • 2021
  • Many lactic acid bacteria (LAB) have probiotic properties that exert various health benefits. In this study, the reduction potential of nitrogen oxide compounds and ferric ions by six LAB, including Lactobacillus kimchicus, L. lactis, L. casei, L. plantarum, L. rhamnosus GG, and Leuconostoc mesenteroides were evaluated. The L. kimchicus strain produced a substantial amount of nitrite reduced from nitrate added to the media, whereas the other five LAB strains did not. L. kimchicus also showed the most potent reducing activity of ferric to ferrous ions. However, the reduction potential of the autoclaved L. kimchicus was little pronounced. The scavenging activities of viable LAB or their cell lysates against different radicals were not consistent with the potency of the LAB's reducing ability. The present results indicate that L. kimchicus has a strong reduction potential for nitrogen oxides in viable status, and that this ability can be used as a probiotic property for various health benefits.

A study on the preparation of ${alpha}-Fe_2O_3$films by dip-coating method (Dip-coating법에 의한 ${alpha}-Fe_2O_3$막 제조에 관한 연구)

  • 강경원;정용선;현부성;오근호
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.8 no.2
    • /
    • pp.292-298
    • /
    • 1998
  • ${\alpha}-Fe_2O_3$films were prepared by a dip-coating method using the mixed solution of ferric nitrate, ethylene glycol and acethyl acetone. The polymerization effect of the mixed solution was studied by FT-IR spectroscopic analysis, and the decomposition of organic parts and crystallization of the dip-coated film were investigated by FT-IR, XRD and DSC. In addition, AFM and SEM were employed to analyze the surface roughness and the thickness of ${\alpha}-Fe_2O_3$films.

  • PDF