Publications by authors named "K Deanda"

Background: UCHealth's Mobile Stroke Unit (MSU) at University of Colorado Hospital is an ambulance equipped with a computed tomography (CT) scanner and tele-stroke capabilities that began clinical operation in Aurora, Colorado January 2016. As one of the first MSU's in the United States, it was necessary to design unique and dynamic information technology infrastructure. This includes high-speed cellular connectivity, Health Insurance Portability and Accountability Act compliance, cloud-based and remote access to electronic medical records (EMR), and reliable and rapid image transfer.

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The substrate fermentation range of the ethanologenic bacterium Zymomonas mobilis was expanded to include the pentose sugar, L-arabinose, which is commonly found in agricultural residues and other lignocellulosic biomass. Five genes, encoding L-arabinose isomerase (araA), L-ribulokinase (araB), L-ribulose-5-phosphate-4-epimerase (araD), transaldolase (talB), and transketolase (tktA), were isolated from Escherichia coli and introduced into Z. mobilis under the control of constitutive promoters that permitted their expression even in the presence of glucose.

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The ethanol-producing bacterium Zymomonas mobilis was metabolically engineered to broaden its range of fermentable substrates to include the pentose sugar xylose. Two operons encoding xylose assimilation and pentose phosphate pathway enzymes were constructed and transformed into Z. mobilis in order to generate a strain that grew on xylose and efficiently fermented it to ethanol.

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We have engineered an industrial strain of the yeast, Candida tropicalis, for the efficient production of long-chain dicarboxylic acids, which are important raw materials for the chemical industry. By sequential disruption of the four genes encoding both isozymes of the acyl-CoA oxidase which catalyzes the first reaction in the beta-oxidation pathway, alkane and fatty acid substrates have been successfully redirected to the omega-oxidation pathway. Consequently, the conversion efficiency and chemical selectivity of their terminal oxidation to the corresponding dicarboxylic acids has been improved to 100 percent.

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A recently developed transformation system has been used to facilitate the sequential disruption of the Candida tropicalis chromosomal POX4 and POX5 genes, encoding distinct isozymes of the acyl coenzyme A (acyl-CoA) oxidase which catalyzes the first reaction in the beta-oxidation pathway. The URA3-based transformation system was repeatedly regenerated by restoring the uracil requirement to transformed strains, either through selection for spontaneous mutations or by directed deletion within the URA 3 coding sequence, to permit sequential gene disruptions within a single strain of C. tropicalis.

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