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https://www.selleckchem.com/products/apx2009.html Our results indicated that QCD modulated the diversity and composition of the gut microbiota in antibiotic-treated mice with diarrhea. The synergistic effect between Qiweibaizhu powder extract and Debaryomyces hansenii may be related to Bifidobacterium and Bacteroidales S24-7 group_unidentified. © King Abdulaziz City for Science and Technology 2020.Genome-scale metabolic network model (GSMM) is an important in silico tool that can efficiently predict the target genes to be modulated. A Corynebacterium crenatum argB-M4 Cc_iKK446_arginine model was constructed on the basis of the GSMM of Corynebacterium glutamicum ATCC 13032 Cg_iKK446. Sixty-four gene deletion sites, twenty-four gene enhancement sites, and seven gene attenuation sites were determined for the improvement of l-arginine production in engineered C. crenatum. Among these sites, the effects of disrupting putP, cgl2310, pta, and Ncgl1221 and overexpressing lysE on l-arginine production were investigated. Moreover, the strain CCM007 with deleted putP, cgl2310, pta, and Ncgl1221 and overexpressed lysE produced 24.85 g/L l-arginine. This finding indicated a 106.8% improvement in l-arginine production compared with that in CCM01. GSMM is an excellent tool for identifying target genes to promote l-arginine accumulation in engineered C. crenatum. © King Abdulaziz City for Science and Technology 2020.The reductive tricarboxylic acid (rTCA) cycle was reconstructed in Escherichia coli by introducing pGETS118KAFS, where kor (encodes α-ketoglutarateferredoxin oxidoreductase), acl (encodes ATP-dependent citrate lyase), frd (encodes fumarate reductase), and sdh (encodes succinate dehydrogenase) were tandemly conjugated by the ordered gene assembly in Bacillus subtilis (OGAB). E. coli MZLF (E. coli BL21(DE3) Δzwf, Δldh, Δfrd) was employed so that the C-2/C-1 [(ethanol + acetate)/(formate + CO2)] ratio can be used to investigate the effectiveness of the recombinant rTCA for

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