• Title/Summary/Keyword: Co-phosphate

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Studies on Biofunctional Synthetic Membranes -Poly(MTP-co-BMA-co-GMA) membrane-

  • 정석규;박수민
    • Proceedings of the Membrane Society of Korea Conference
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    • 1992.10a
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    • pp.47-48
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    • 1992
  • Polymer containing monomers with pendant phospholipid polar group, 2-(metha-cryloyoxy) ethyl-2-(trimethylammonium) ethyl phosphate(MTP) were synthesized and blood compatibility of the copolymers was evaluated. Good permeability of biocomponents of molecular weight below 10$^4$ through cellulosic membrane coated with the copolymer of 2-(methacryloyoxy) ethyl-2-(tri-methylammonium)ethyl phosphate, butylmethacrylate(BMA), and glycidyl methacrylate(GMA) was observed, (Fig.1).

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Increase of $CoQ_{10}$ Production Level by the Coexpression of Decaprenyl Diphosphate Synthase and 1-Deoxy-D-xylulose 5-Phosphate Synthase Isolated from Rhizobium radiobacter ATCC 4718 in Recombinant Escherichia coli

  • Seo, Myung-Ji;Im, Eun-Mi;Nam, Jung-Yeon;Kim, Soon-Ok
    • Journal of Microbiology and Biotechnology
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    • v.17 no.6
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    • pp.1045-1048
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    • 2007
  • Two genes, dps encoding decaprenyl diphosphate synthase and dxs encoding 1-deoxy-D-xylulose 5-phosphate synthase, were isolated from Rhizobium radiobacter ATCC 4718. DNA sequencing analysis of the dps and dxs genes revealed an open reading frame of 1,077 bp and 1,920 bp, respectively. The heterologous expression in Escherichia coli BL21(DE3) was carried out in order to identify their functions. Recombinant E. coli BL21(DE3) harboring the dps gene produced $CoQ_{10}$ as well as $CoQ_8$ and $CoQ_9$, whereas E. coli harboring only the dxs gene produced more $CoQ_8$ compared with the wild-type E. coli. Additionally, the coexpression of dps and dxs genes in E. coli was carried out. The recombinant E. coli harboring only the dps gene produced $0.21{\pm}0.04\;mg/l$ of $CoQ_{10}$, whereas the coexpressed E. coli with dps and dxs genes produced $0.37{\pm}0.07\;mg/l$ of $CoQ_{10}$. HPLC analysis also showed that the $CoQ_{10}$ fraction (100% of the total CoQs distribution) was increased from $15.86{\pm}0.66%$ (only dps) to $29.78{\pm}1.80%$ (dps and dxs).

Direct Synthesis of Dimethyl Ether from Synthesis Gas (합성가스로부터 디메틸에테르 직접 합성)

  • Hahm, Hyun-Sik;Kim, Song-Hyoung;Kang, Young-Gu;Shin, Ki-Seok;Ahn, Sung-Hwan
    • Journal of the Korean Institute of Gas
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    • v.13 no.4
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    • pp.8-14
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    • 2009
  • Dimethyl ether(DME) was synthesized from synthesis gas by a one-step process in which a hybrid catalyst was used. The hybrid catalyst consisted of Cu-ZnO-$Al_2O_3$ for the methanol synthesis reaction and aluminum phosphate or $H_3PO_4$-modified $\gamma$-alumina for the methanol dehydration reaction. The prepared catalysts were characterized by XRD, BET, SEM, FT-IR and $NH_3$-TPD. From the XRD analysis, it was verified that the aluminum phosphate was successfully synthesized. The specific surface areas of the synthesized aluminum phosphates were varied with the ratio of P/Al. The hybrid catalyst in which P/Al ratio of the aluminum phosphate was 1.2 showed the highest CO conversion of 55% and DME selectivity of 70%. There was no remarkable decrease in catalytic activity with the phosphoric acid treatment of $\gamma$-alumina. However, when treated with concentrated phosphoric acid(85%), the catalytic activity and DME selectivity decreased.

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Physicochemical Characteristics of Selective Adsorption of Tin Phosphate on the Transition metal ions (전이금속 이온에 대한 주석 인산염의 선택적 흡착에 관한 물리화학적 특성)

  • Ahn, Beom-Shu
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.5
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    • pp.1222-1228
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    • 2020
  • The adsorption and ion exchange properties of tin phosphate were studied in an aqueous solution of KCl, varing the pH and metal ion concentration in the solution. The data were explained on the basis of chemical equilibrium. Tin phosphate behaved as an acidic ion exchanger and had an adsorption selectivity toward the bivalent transition metal ions in the following order : Cu+2 > Co+2 > Ni+2. As in the case of a weekly acidic exchanger, the change in hydration of metal ions played the dominant role in determining the selectivity of tin phosphate. In all cases the extent of adsorption increased with an increase in temperature and concentration. The apperance of irregular kinks in the titration curves justified the presence of several exchangeable adsorption sites with different pKa values.

Manufacture Technology of Monoammonium phosphate from LCD Waste Acid (LCD 제조공정의 혼합폐산으로부터 일인산암모늄 제조 기술)

  • Lee, Ha-Young;Lee, Sang-Gil;Park, Sung-Kook;Kim, Ju-Han;Kim, Ju-Yup;Kim, Jun-Young
    • Clean Technology
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    • v.15 no.4
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    • pp.253-257
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    • 2009
  • The waste solution discharged form the LCD(Liquid Crystal Display) manufacturing process contains phosphoric acid, nitric acid, acetic acid and metal ions such Al and other impurities. In this study, vacuum evaporation and diffusion dialysis was developed to commercialize an efficient system for recovering the high-purity phosphoric acid and manufacturing monoammonium phosphate. By vacuum evaporation, almost 99% of nitric and acetic acid was removed. Also, by diffusion dialysis, about 97.5% of Al was removed. Monoammonium phosphate was manufactured from purified phosphoric acid and ammonium hydroxide. In order to get the optimum manufacturing condition, the molar ratio of ammonium hydroxide and phosphoric acid, pH and temperature was controlled. Using this optimum condition, we obtained the recovery rate of monoammonium phosphate of about 90%.

Effect of Co-inoculation of Two Bacteria on Phosphate Solubilization

  • Lee, Yu-Jin;Lee, Heon-Hwak;Lee, Chan-Jung;Yoon, Min-Ho
    • Korean Journal of Soil Science and Fertilizer
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    • v.49 no.4
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    • pp.318-326
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    • 2016
  • Two phosphate solubilizing bacteria, Pantoea rodasii PSB-11and Enterobacter aerogenes PSB-12, were isolated from button mushroom compost and employed to assess their synergistic effect in liquid medium and on growth of green gram plants by single and co-inoculation of the strains. Co-inoculation of two strains was found to release the highest content of soluble phosphorus ($521{\mu}g\;ml^{-1}$) into the medium, followed by single inoculation of Pantoea strain ($485{\mu}g\;ml^{-1}$) and Enterobacter strain ($470{\mu}g\;ml^{-1}$). However, there was no significant difference between single inoculation of bacterial strain and co-inoculation of two bacterial strains in terms of phosphorous release. The highest pH reduction, organic acid production and glucose consumption was observed in the E. aerogenes PSB-12 single inoculated culture medium rather than those of co-inoculation. According to the plant growth promotion bioassay, co-inoculated mung bean seedlings recorded 10.6% and 10.7% higher shoot and root growth respectively compared to the control. Therefore, in concluding, co-inoculation of the strains P. rodasii and E. aerogenes displayed better performance in stimulating plant growth than inoculation of each strain alone. However, being short assessment period of the present study, we recommend in engaging further works under field conditions in order to test the suitability of the strains to be used as bio-inoculants.

Enhanced Biomass Productivity of Freshwater microalga, Parachlorella kessleri for Fixation of Atmospheric CO2 Using Optimal Culture Conditions (최적 배양 조건을 이용한 CO2 제거 목적의 담수 미세조류 Parachlorella kessleri의 바이오매스 생산성 향상)

  • Z-Hun Kim;Sun Woo Hong;Jinu Kim;Byungrak Son;Mi-Kyung Kim;Yong Hwan Kim;Jin Hyun Seol;Su-Hwan Cheon
    • Journal of Marine Bioscience and Biotechnology
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    • v.16 no.1
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    • pp.36-44
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    • 2024
  • This study attempted to improve the growth of the freshwater microalgae, Parachlorella kessleri, through the sequential optimization of culture conditions. This attempt aimed to enhance the microalgae's ability to fixate atmospheric CO2. Culture temperature and light intensity appropriate for microalgal growth were scanned using a high-throughput photobioreactor system. The supplied air flow rate varied from 0.05 to 0.3 vvm, and its effect on the growth rate of P. kessleri was determined. Next, sodium phosphate buffer was added to the culture medium (BG11) to enhance CO2 fixation by increasing the availability of CO2(HCO3-) in the culture medium. The results indicated that optimal culture temperature and light intensity were 20℃-25℃ and 300 μE/m2/s, respectively. Growth rates of P. kessleri under various air flow rates highly depended on the increase of the culture's flow rate and pH which determines CO2 availability. Adding sodium phosphate buffer to BG11 to maintain a constant neutral pH (7.0) improved microalgal growth compared to control conditions (BG11 without sodium phosphate). These results indicate that the CO2 fixation rate in the air could be enhanced via the sequential optimization of microalgal culture conditions.

A study on the evaluation of phosphate removal efficiency using Fe-coated silica sand (철 코팅 규사의 인산이온 제거 효율 평가 연구)

  • Jo, Eunyoung;Kim, Younghee;Park, Changyu
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.6
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    • pp.521-527
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    • 2017
  • Phosphorus is one of the limiting nutrients for the growth of phytoplankton and algae and is therefore one of leading causes of eutrophication. Most phosphorous in water is present in the form of phosphates. Different technologies have been applied for phosphate removal from wastewater, such as physical, chemical precipitation by using ferric, calcium or aluminum salts, biological, and adsorption. Adsorption is one of efficient method to remove phosphates in wastewater. To find the optimal media for phosphate removal, physical characteristics of media was analysed, and the phosphate removal efficiency of media (silica sand, slag, zeolite, activated carbon) was also investigated in this study. Silica sand showed highest relative density and wear rate, and phosphate removal efficiency. Silica sand removed about 36% of phosphate. To improve the phosphate removal efficiency of silica sand, Fe coating was conducted. Fe coated silica sand showed 3 times higher removal efficiency than non-coated one.

Hydration Properties of $\alpha$-Tricalcium Phosphate in Tris. Solution ($\alpha$-Tricalcium Phosphate의 Tris. Solution에서의 수화특성)

  • 인경필;최상흘
    • Journal of the Korean Ceramic Society
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    • v.30 no.11
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    • pp.905-910
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    • 1993
  • $\alpha$-tricalcium phosphate($\alpha$-TCP) powders were synthesized and their hydration properties were investigated in Tris. solution. Two kinds of $\alpha$-TCP powder samples were prepared; the one is reaction product of CaHPO4.2H2O and CaCO3, and another is that of hydroxyapatite(HAp) and $\beta$-Ca2P2O7. They were satisfied with Ca/P mole ratio 1.5 and were heated at 150$0^{\circ}C$ for 5 hours. In the hydration of $\alpha$-TCP samples the powder which was synthesized from HAp and $\beta$-Ca2P2O7 was hydrated faster than that from CaHPO4.2H2O and CaCO3. The hydration reaction of $\alpha$-TCP powder transformed rapidly into HAp accompanying setting and hardening. It was realized that the hydration reaction of $\alpha$-TCP was due to the solution-precipitation mechanism and the hydrates from the reaction were Ca-deficient HAp having funtional group HPO42-.

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Cell Biological Studies on the Mechanism of Development and Differentiation Ⅷ 3. Effects of Polyamines on the Activities of Corn Glucose-6-Phosphate Dehydrogenase, 6-Phosphogluconate Dehydrogenase, and Protein Kinase (생체발생 및 분화기구의 세포생물학적 연구 Ⅷ 3. Polyamine이 옥수수 배의 Glucose-6-Phosphate Dehydrogenase, 6-Phosphogluconate Dehydrogenase 및 Protein Kinase 활성에 미치는 영향)

  • Cho, Young Dong
    • Journal of Plant Biology
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    • v.27 no.2
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    • pp.73-80
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    • 1984
  • Palmitoyl CoA was found to inhibit corn embryo axis glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase, which were also inhibites by polyamines. However, reversal of inhibition of both enzymes by palmitoyl CoA was made by spermine. Activity of corn embryo axis protein kinase was found to increase steadily after germination. Activation and inhibition of protein kinase were made by MgCl$_2$and all polymines, respectively. Suc results suggest that fatty acid biosynthesis and lypolysis could be regulated to some extent by polyamines in corn embryo axis.

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