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Sanjeev Kumar Soni - One of the best experts on this subject based on the ideXlab platform.

  • valorization of waste glycerol for the Production of poly 3 hydroxybutyrate and poly 3 hydroxybutyrate co 3 hydroxyvalerate copolymer by cupriavidus necator and extraction in a sustainable manner
    Bioresource Technology, 2017
    Co-Authors: Geeta Gahlawat, Sanjeev Kumar Soni
    Abstract:

    Abstract Glycerol is a by-Product of many industrial processes and huge amounts of it are generated in the form of waste, thereby necessitating a search for the method of its disposal. An interesting solution is the valorization of crude glycerol into value added Product such as polyhydroxyalkanoates (PHAs). The feasibility of producing PHAs by Cupriavidus necator was evaluated using crude glycerol (WG). Various cultivation strategies were designed for the Production of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) copolymer by adding different organic acids as precursors at different concentrations levels. Batch cultivation of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) Production showed accumulation of 6.76 g/L biomass containing 4.84 g/L copolymer on WG with a maximum 3-hydroxyvalerate content of 24.6 mol%. PHAs extraction using a non-toxic and recyclable solvent, 1,2 propylene carbonate, showed the highest recovery yield (90%) and purity (93%) at 120 °C temperature and 30 min incubation. This is the first report on jatropha based glycerol valorization for poly(3-hydroxybutyrate- co -3-hydroxyvalerate) Production coupled with extraction using non-toxic solvent.

Geeta Gahlawat - One of the best experts on this subject based on the ideXlab platform.

  • valorization of waste glycerol for the Production of poly 3 hydroxybutyrate and poly 3 hydroxybutyrate co 3 hydroxyvalerate copolymer by cupriavidus necator and extraction in a sustainable manner
    Bioresource Technology, 2017
    Co-Authors: Geeta Gahlawat, Sanjeev Kumar Soni
    Abstract:

    Abstract Glycerol is a by-Product of many industrial processes and huge amounts of it are generated in the form of waste, thereby necessitating a search for the method of its disposal. An interesting solution is the valorization of crude glycerol into value added Product such as polyhydroxyalkanoates (PHAs). The feasibility of producing PHAs by Cupriavidus necator was evaluated using crude glycerol (WG). Various cultivation strategies were designed for the Production of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) copolymer by adding different organic acids as precursors at different concentrations levels. Batch cultivation of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) Production showed accumulation of 6.76 g/L biomass containing 4.84 g/L copolymer on WG with a maximum 3-hydroxyvalerate content of 24.6 mol%. PHAs extraction using a non-toxic and recyclable solvent, 1,2 propylene carbonate, showed the highest recovery yield (90%) and purity (93%) at 120 °C temperature and 30 min incubation. This is the first report on jatropha based glycerol valorization for poly(3-hydroxybutyrate- co -3-hydroxyvalerate) Production coupled with extraction using non-toxic solvent.

Yong Hwan Kim - One of the best experts on this subject based on the ideXlab platform.

  • Bioelectrochemical conversion of CO 2 to value added Product formate using engineered Methylobacterium extorquens
    Scientific reports, 2018
    Co-Authors: Jungho Jang, Byoung Wook Jeon, Yong Hwan Kim
    Abstract:

    The conversion of carbon dioxide to formate is a fundamental step for building C1 chemical platforms. Methylobacterium extorquens AM1 was reported to show remarkable activity converting carbon dioxide into formate. Formate dehydrogenase 1 from M. extorquens AM1 (MeFDH1) was verified as the key responsible enzyme for the conversion of carbon dioxide to formate in this study. Using a 2% methanol concentration for induction, microbial harboring the recombinant MeFDH1 expressing plasmid produced the highest concentration of formate (26.6 mM within 21 hours) in electrochemical reactor. 60 μM of sodium tungstate in the culture medium was optimal for the expression of recombinant MeFDH1 and Production of formate (25.7 mM within 21 hours). The recombinant MeFDH1 expressing cells showed maximum formate Productivity of 2.53 mM/g-wet cell/hr, which was 2.5 times greater than that of wild type. Thus, M. extorquens AM1 was successfully engineered by expressing MeFDH1 as recombinant enzyme to elevate the Production of formate from CO2 after elucidating key responsible enzyme for the conversion of CO2 to formate.

Hawon Song - One of the best experts on this subject based on the ideXlab platform.

  • corrosion performance of rice husk ash blended concrete
    Construction and Building Materials, 2007
    Co-Authors: Velu Saraswathy, Hawon Song
    Abstract:

    Abstract Rice husk ash is one of the promising pozzolanic materials that can be blended with Portland cement for the Production of durable concrete and at the same time it is a value added Product. Addition of rice husk ash to Portland cement not only improves the early strength of concrete, but also forms a calcium silicate hydrate (CSH) gel around the cement particles which is highly dense and less porous. This may increase the strength of concrete against cracking. So far a systematic and detailed investigations on the corrosion performance of rice husk ash blended concrete is very scarce. Therefore, in the present investigation, a realistic approach has been made using different techniques such as compressive strength, bond strength, split tensile strength etc. Corrosion performance was evaluated using, open circuit potential measurements, rapid chloride ion permeation test and impressed voltage test and the results were discussed.

Zuzana Chadimova - One of the best experts on this subject based on the ideXlab platform.

  • nutrient recovery from apple pomace waste by vermicomposting technology
    Bioresource Technology, 2014
    Co-Authors: Ales Hanc, Zuzana Chadimova
    Abstract:

    The present work was focused on vermicomposting apple pomace waste and its mixtures with straw in volume proportions of 25%, 50%, and 75%. The feasibility was evaluated on the basis of agrochemical properties and earthworm biomass. Vermicomposting was able to reduce the weight and volume of the feedstock by 65% and 85%, respectively. The resulting vermicomposts were characterized by slightly acidic to neutral pH (5.9–6.9), and optimal EC (1.6–4.4 mS/cm) and C:N ratios (13–14). The total content of nutrients increased during vermicomposting for all of the treatments with the following average final values: N = 2.8%, P = 0.85%, K = 2.3%, and Mg = 0.38%. The addition of straw to apple pomace did not enhance earthworm biomass, but did increase the available content of nutrients during vermicomposting. The data reveals that vermicomposting is a suitable technology for the decomposition of apple pomace waste into a value added Product.