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( Asieh Aramvash ),( Narges Gholami Banadkuki ),( Fatemeh Moazzeni Zavareh ),( Samira Hajizadeh Turchi ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.11
The present study developed an efficient and environmentally friendly method for recovering polyhydroxybutyrate (PHB) from Cupriavidus necator. Several non-halogenated solvents were tested and it was found that butyl acetate and ethyl acetate are powerful solvents for the biopolymer. Testing was performed to examine the effects of temperature (25°C until temperature below solvent boiling points) and heating incubation time (0-60 min) on the two solvents. Butyl acetate had a higher recovery level (96%) and product purity (up to 99%) than ethyl acetate at 103°C and a heating incubation time of 30 min. Under these conditions, PHB recorded the highest molecular weight of 1.4 × 106 compared with the standard procedure (i.e., recovery using chloroform). The proposed strategy showed that butyl acetate is a good alternative to halogenated solvents such as chloroform for recovery of PHB.
Rapidly solidified U-6wt%Nb powders for dispersion-type nuclear fuels
McKeown, J.T.,Hsiung, L.L.,Ryu, H.J.,Park, J.M.,Turchi, P.E.A.,King, W.E. North Holland Pub. Co 2014 JOURNAL OF NUCLEAR MATERIALS Vol.448 No.1
<P>The microstructures of U-6 wt%Nb powder particles were investigated to assess their use as a distributed fuel phase in dispersion-type nuclear fuels. The powder was produced by centrifugal atomization, leading to rapid solidification of the molten alloy particles. The microstructure of the solidified particles consisted of a dendritic structure comprising metastable alpha-phase-related dendrites and interdendritic metastable gamma(0) phase formation. The relationship between the observed microstructure and processing conditions are discussed. (C) 2014 Elsevier B.V. All rights reserved.</P>