• 한국재료학회지
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• 제31권11호
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• pp.608-613
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• 2021

This study investigated the reaction between clay and Mn. Mn was coated using a manganese sulfate on porcelain plate and sintered from 1,100 ℃ to 1,250 ℃. The body begin to shrink around 950 ℃ with the increase in temperature and rapidly progressed after 1,100 ℃. Shrinkage of celadon body was performed at a lower temperature than for other substrates. Quartz, kaolin, and feldspar were the main crystalline phases of the starting materials, but they became mullite and crystobalite during the firing process, and some formed amorphous glass. When manganese sulfate was applied and fired, manganese oxide was fused, and some manganese oxide reacted with the substrate to show a dense microstructure different from that of the substrate; the substrate had pores. The manganese coated porcelain fired at 1,200 ℃ had L^* values of 55.25, 36.87, and 37.13 for the white ware, celadon body, and white mixed ware, respectively; with a^* values of 4.63, 3.07, and 2.15, and b^* values of 7.93 and 3.98, it was found to be 3.42. This result indicated that the color of the surface was affected during firing by the chemical reaction between the substrate and manganese.

• 한국대기환경학회지
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• 제21권3호
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• pp.277-284
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• 2005

Catalytic oxidation of toluene in low concentrations was investigated over various supports. As the manganese oxides loading was increased, the conversion of toluene increased at a lower temperature. The 18.2 $wt\%$ $Mn/\gamma-Al_2O_3$ appeared to be the most active catalyst. Among the supports, $\gamma-Al_2O_3$ was more active than $TiO_2$ and $SiO_2$. Manganese oxide catalysts prepared from manganese nitrate precursor were better for complete oxidation of toluene than those prepared from manganese sulfate and chloride precursor because sulfate from manganese sulfate and chloride from chloride manganese remained even after the calcination by XRD (X-Ray Diffraction) analyses.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.900-903
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• 2003

Using $DV-X{\alpha}$ method, it is calculated that nickel reduces the energy band gap of manganese oxide in 3 additives of titanium, nickel and tin. Therefore, it is estimated that the electrical conductivity of manganese-nickel oxide has the lowest value in 3 kinds of manganese oxide. The manganese oxide and manganese-nickel oxide which were produced by anodic deposition under $30mA/cm^2$ at room temperature in manganese sulfate and manganese-nickel sulfate solution were thermal-analyzed by DTA and TGA. The weight change of manganese oxide continuously decreased below $508^{\circ}C$ and kept constant at $518{\sim}600^{\circ}C$. However, the manganeses-nickel oxide transformed at the temperature range of $510{\sim}537^{\circ}C$. It is observed that the nickel addition to manganese oxide increases transformation temperature and its range.

• 한국식품저장유통학회지
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• 제10권4호
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• pp.554-559
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• 2003

동치미로부터 분리된 Latobacillus sp. FF-3의 Bacteriocin 생산에 대한 최적 배양조건과 배양 특성을 조사하였다. Bacteriocin 생산을 위한 최적 생산조건은 MRS(proteose peptone 1%, beef extract 1%, yeast extract 0.5%, glucose 2%, polysorbate 80 0.1%, ammonium citrate 0.2%, sodium acetate 0.5%, magnesium sulfate 0.01%, manganese sulfate 0.005%, dipotassium phosphate 0.2%) 배지를 기본으로 하여 21시간 배양한 결과, 배양온도는 30∼37$^{\circ}C$, 초기 pH는 7.0 으로 확인되었다. 최적 생산배지조성으로 탄소원은 glucose 3%, 질소원은 tryptone 4%, 무기염류는 manganese sulfate 0.005%가 bacteriocin 생성에 최적 조성으로 나타났으며, 최적 배지상에서 항균활성은 최대 484 BUf/mL로 나타났다.

• 한국세라믹학회지
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• 제11권4호
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• pp.37-42
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• 1974

Preparation of pink color stains was studied using manganese sulfate and aluminum salts. As the results obtained in this study, the composition range of the stains showing favorable pink celor was as follows: MnO.0.5-0.8P2O5.1.70-3.00 Al2O3 Furthermore, as the results of applied tests for glazes and the color measured by Color Eye, the usefulness of the stains was approved.

• 생명과학회지
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• 제18권1호
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• pp.84-90
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• 2008

충청남도 병천면 일대의 6곳의 토양시료를 채취하여 망간을 산화하는 균주들을 순수분리 하고, 이 중 망간 산화능이 가장 우수한 한 균주를 최종 선별하여 본 실험에 사용하였다. 최종 선별된 균주의 생리, 생화학적 특성을 조사하고, 16S rRNA 염기 서열분석 등을 통하여 동정한 결과 최종 선별된 균주는 Pseudomonas sp. MN5로 확인되었다. Pseudomonas sp. MN5은 fructose와 maltose를 제외한 다양한 당을 이용하지 못하였으며, 항생제인 kanamycin, chloramphenicol, streptomycin 그리고 tetracycline에는 높은 감수성을 보이고, 리튬, 망간, 바륨과 같은 중금속에 대해서는 mg/ml 단위의 높은 내성을 나타냈다. 그리고 Pseudomonas sp. MN5의 망간산화 최적 pH는 7.5이고, 망간산화 활성이 proteinase K와 가열처리를 한 시료에서 저해되었다. Pseudomonas sp. MN5가 생성하는 망간산화 단백질을 ammonium sulfate precipitation, HiTrap Q FF ion exchange chromatography 그리고 G3000sw $_{XL}$ gel filtration chromatography를 통해서 정제한 결과, 15 kDa, 46.7 kDa 그리고 63.5 kDa의 세종류의 manganese oxidizing protein가 확인되었고, 내부서 열과 N-말단 서열 분석 결과 Pseudomonas sp. MN5가 생성하는 망간산화 단백질은 외막의 porin 단백질인 것으로 추정되었다.

• Journal of Electrochemical Science and Technology
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• 제13권2호
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• pp.177-185
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• 2022

Electrochemical properties of LiMn₂O₄ cathode were investigated in three types of Zn-containing electrolytes: lithium-zinc sulfate electrolyte (1M ZnSO₄ / 2M Li₂SO₄), zinc sulfate electrolyte (2MZnSO₄) and lithium-zinc-manganese sulfate electrolyte (1MZnSO₄ / 2MLi₂SO₄ / 0.1MMnSO₄). Cyclic voltammetry measurements demonstrated that LiMn₂O₄ is electrochemically inactive in pure ZnSO₄ electrolyte after initial oxidation. The effect of manganese (II) additive in the zinc-manganese sulfate electrolyte on the electrochemical performance was analyzed. The initial capacity of LiMn₂O₄ is higher in presence of MnSO₄ (140 mAh g^-1 in 1 M ZnSO₄ / 2 M Li₂SO₄ / 0.1 M MnSO₄ and 120 mAh g^-1 in 1 M ZnSO₄ / 2MLi₂SO₄). The capacity increase can be explained by the electrodeposition of MnO_x layer on the electrode surface. Structural characterization of postmortem electrodes with use of XRD and EDX analysis confirmed that partially formed in pure ZnSO₄ electrolyte Zn-containing phase leads to fast capacity fading which is probably related to blocked electroactive sites.

• 생명과학회지
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• 제15권1호
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• pp.94-99
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• 2005

충청남도 목천과 충청북도 오창 근교의 토양으로부터 망간을 산화하는 64 집락을 분리하고 이 중 망간 산화능이 가장 우수한 한 균주를 최종 선별하여 생리, 생화학적 특성을 조사하고, 16S rRNA 염기 서열분석 등을 통하여 동정한 결과 최종 선별된 균주는 Aeromonas sp. MN44로 확인되었다. 최종 선별된 Aeromenas sp. MN44는 lactose를 제외한 여러 당들은 이용하지 못하였으며, 중금속내성은 lithium과 manganese에 대해서는 mg/ml 단위의 높은 농도까지 중금속 내성을 가지고 있었지만 cadmium에는 전혀 내성을 나타내지 않았다. 또 kanamycin, chloramphenicol, ampicillin, tetracycline, spectinomycin등 조사한 모든 항생제에 대해 전혀 내성을 갖지 않았다. Aeromonas sp. MN44가 생성하는 망간산화물질의 최적 pH는 pH 7.4로 확인되었으며, 이 균이 생성하는 망간 산화 factor는 proteinase K와 가열처리에 의해 저해되는 단백질이고, ammonium sulfate 침전과 ion exchange chromatography 그리고 gel filtration의 단계를 통해 부분 정제한 망간 산화 factor의 분자량은 약 113 kDa로 확인되었다.

• Ocean and Polar Research
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• 제32권3호
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• pp.299-307
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• 2010

In conjunction with geochemical characteristics, rate of sulfate reduction was investigated at two sediment sites in the continental slope and rise (basin) of the Ulleung Basin in the East Sea. Geochemical sediment analysis revealed that the surface sediments of the basin site (D2) were enriched with manganese oxides (348 ${\mu}mol$ $cm^{-3}$) and iron oxides (133 ${\mu}mol$ $cm^{-3}$), whereas total reduced sulfur (TRS) in the solid phase was nearly depleted. Sulfate reduction rates (SRRs) ranged from 20.96 to 92.87 nmol $cm^{-3}$ $d^{-1}$ at the slope site (M1) and from 0.65 to 22.32 nmol $cm^{-3}$ $d^{-1}$ at the basin site (D2). Depth integrated SRR within the top 10 cm depth of the slope site (M1; 5.25 mmol $m^{-2}$ $d^{-1}$) was approximately 6 times higher than that at the basin site (D2; 0.94 mmol $m^{-2}$ $d^{-1}$) despite high organic content (>2.0% dry wt.) in the sediment of both sites. The results indicate that the spatial variations of sulfate reduction are affected by the distribution of manganese oxide and iron oxide-enriched surface sediment of the Ulleung Basin.

• 자원리싸이클링
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• 제9권6호
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• pp.3-8
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• 2000

본 연구는 폐 망간전지의 음극합체로부터 Mn성분을 분리 회수할 수 있는 새로운 공정개발을 위하여 폐 망간전지의 음극합체와 황산암모늄과의 분해반응을 조사하였다 최적 분해반응 조건은 반응온도 $425^{\circ}C$, 폐 망간전지의 음극합체에 대한 황산암모늄의 무게비 12.0, 반응시간 60분이었고, 이 조건에서 얻어진 Mn의 최고 회수율은 93.5%였다.