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Kumar, Prasun,Singh, Mamtesh,Mehariya, Sanjeet,Patel, Sanjay K S,Lee, Jung-Kul,Kalia, Vipin C Association of Microbiologists of India 2014 Indian journal of microbiology Vol.54 No.2
<P>Ecobiotechnological approach is an attractive and economical strategy to enrich beneficial microbes on waste biomass for production of Polyhydroxyalkanoate (PHA). Here, six strains of Bacillus spp. were used to produce co-polymers of PHA from pea-shells. Of the 57 mixed bacterial cultures (BCs) screened, two of the BCs, designated as 5BC1 and 5BC2, each containing 5 strains could produce PHA co-polymer at the rate of 505-560?mg/l from feed consisting of pea-shell slurry (PSS, 2?% total solids) and 1?% glucose (w/v). Co-polymer production was enhanced from 65-560?mg/l on untreated PSS to 1,610-1,645?mg/l from PSS treated with defined hydrolytic bacteria and 1?% glucose. Supplementation of the PSS hydrolysate with sodium propionate enabled 5BC1 to produce co-polymer P(3HB-co-3HV) with a 3HV content up to 13?% and a concomitant 1.46-fold enhancement in PHA yield. Using the principles of ecobiotechnology, this is the first demonstration of PHA co-polymer production by defined co-cultures of Bacillus from biowaste as feed under non-axenic conditions.</P>
Enhancement in hydrogen production by co-cultures of Bacillus and Enterobacter
Patel, S.K.S.,Kumar, P.,Mehariya, S.,Purohit, H.J.,Lee, J.K.,Kalia, V.C. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.27
Defined co-cultures of hydrogen (H<SUB>2</SUB>) producers belonging to Citrobacter, Enterobacter, Klebsiella and Bacillus were used for enhancing the efficiency of biological H<SUB>2</SUB> production. Out of 11 co-cultures consisting of 2-4 strains, two co-cultures composed of Bacillus cereus EGU43, Enterobacter cloacae HPC123, and Klebsiella sp. HPC793 resulted in H<SUB>2</SUB> yield up to 3.0 mol mol<SUP>-1</SUP> of glucose. Up-scaling of the reactor by 16-fold resulted in a corresponding increase in H<SUB>2</SUB> production with an actual evolution of 7.44 L of H<SUB>2</SUB>. It constituted 58.2% of the total biogas. Continuous culture evolution of H<SUB>2</SUB> by co-cultures (B. cereus EGU43 and E. cloacae HPC123) immobilized on ligno-cellulosic materials resulted in 6.4-fold improvement in H<SUB>2</SUB> yield compared to free floating bacteria. This synergistic influence of B. cereus and E. cloacae can offer a better strategy for H<SUB>2</SUB> production than undefined or mixed cultures.
Production of Methanol from Methane by Encapsulated Methylosinus sporium
( Sanjay K. S. Patel ),( Jae-hoon Jeong ),( Sanjeet Mehariya ),( Sachin V. Otari ),( Bharat Madan ),( Jung Rim Haw ),( Jung-kul Lee ),( Liaoyuan Zhang ),( In-won Kim ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.12
Massive reserves of methane (CH<sub>4</sub>) remain unexplored as a feedstock for the production of liquid fuels and chemicals, mainly because of the lack of economically suitable and sustainable strategies for selective oxidation of CH4 to methanol. The present study demonstrates the bioconversion of CH<sub>4</sub> to methanol mediated by Type I methanotrophs, such as Methylomicrobium album and Methylomicrobium alcaliphilum. Furthermore, immobilization of a Type II methanotroph, Methylosinus sporium, was carried out using different encapsulation methods, employing sodium-alginate (Na-alginate) and silica gel. The encapsulated cells demonstrated higher stability for methanol production. The optimal pH, temperature, and agitation rate were determined to be pH 7.0, 30oC, and 175 rpm, respectively, using inoculum (1.5 mg of dry cell mass/ml) and 20% of CH<sub>4</sub> as a feed. Under these conditions, maximum methanol production (3.43 and 3.73 mM) by the encapsulated cells was recorded. Even after six cycles of reuse, the Na-alginate and silica gel encapsulated cells retained 61.8% and 51.6% of their initial efficiency for methanol production, respectively, in comparison with the efficiency of 11.5% observed in the case of free cells. These results suggest that encapsulation of methanotrophs is a promising approach to improve the stability of methanol production.