Physician

Radiology

Dr. Stephen K. Armstrong practices Radiology. He graduated from University of Texas Medical School. Dr. Stephen K. Armstrong is a published physician. He has 38 papers published. The most current publication "Identification and characterization of alcR, a gene encoding an AraC-like regulator of alcaligin siderophore biosynthesis and transport in Bordetella pertussis and Bor..."

Publications

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• The Bordetella bhu locus is required for heme iron utilization.
• Transcriptional activation of Bordetella alcaligin siderophore genes requires the AlcR regulator with alcaligin as inducer.
• Kinetics and mechanism of iron(III) dissociation from the dihydroxamate siderophores alcaligin and rhodotorulic acid.
• Essential role of the iron-regulated outer membrane receptor FauA in alcaligin siderophore-mediated iron uptake in Bordetella species.
• Transcriptional analysis of the Bordetella alcaligin siderophore biosynthesis operon.
• Identification and characterization of alcR, a gene encoding an AraC-like regulator of alcaligin siderophore biosynthesis and transport in Bordetella pertussis and Bor...
• Identification and characterization of iron-regulated Bordetella pertussis alcaligin siderophore biosynthesis genes.
• The ornithine decarboxylase gene odc is required for alcaligin siderophore biosynthesis in Bordetella spp.: putrescine is a precursor of alcaligin.
• Epitope insertions define functional and topological features of the Escherichia coli ferric enterobactin receptor.
• Bordetella pertussis fur gene restores iron repressibility of siderophore and protein expression to deregulated Bordetella bronchiseptica mutants.
• Heat-modifiable envelope proteins of Bordetella pertussis.
• Cell surface antigens of Bordetella pertussis.
• Surface antigens of Bordetella pertussis.
• Surface proteins of Bordetella pertussis.
• Surface proteins of Bordetella pertussis: comparison of virulent and avirulent strains and effects of phenotypic modulation.
• Formation of ion channels by colicin B in planar lipid bilayers.
• Formation of a gated channel by a ligand-specific transport protein in the bacterial outer membrane.
• Bordetella pertussis major outer membrane porin protein forms small, anion-selective channels in lipid bilayer membranes.
• The Escherichia coli enterobactin biosynthesis gene, entD: nucleotide sequence and membrane localization of its protein product.
• Colicins B and Ia as novel counterselective agents in interspecies conjugal DNA transfers from colicin-sensitive Escherichia coli donors to other gram-negative recipie...
• Molecular analysis of the Escherichia coli ferric enterobactin receptor FepA.
• The Bordetella bfe system: growth and transcriptional response to siderophores, catechols, and neuroendocrine catecholamines.
• The BfeR regulator mediates enterobactin-inducible expression of Bordetella enterobactin utilization genes.
• Norepinephrine mediates acquisition of transferrin-iron in Bordetella bronchiseptica.
• Heme transport contributes to in vivo fitness of Bordetella pertussis during primary infection in mice.
• Bordetella iron transport and virulence.
• Purification, spectroscopic analysis and biological activity of the macrocyclic dihydroxamate siderophore alcaligin produced by Bordetella pertussis and Bordetella bro...
• Temporal signaling and differential expression of Bordetella iron transport systems: the role of ferrimones and positive regulators.
• Impact of alcaligin siderophore utilization on in vivo growth of Bordetella pertussis.
• Differential expression of Bordetella pertussis iron transport system genes during infection.
• Isolation and characterization of Bordetella bronchiseptica mutants deficient in siderophore activity.
• Transcriptional profiling of the iron starvation response in Bordetella pertussis provides new insights into siderophore utilization and virulence gene expression.
• Bordetella AlcS transporter functions in alcaligin siderophore export and is central to inducer sensing in positive regulation of alcaligin system gene expression.
• Integration of environmental signals controls expression of Bordetella heme utilization genes.
• Heme-responsive transcriptional activation of Bordetella bhu genes.
• Alcaligin siderophore production by Bordetella bronchiseptica strain RB50 is not repressed by the BvgAS virulence control system.
• Bordetella interspecies allelic variation in AlcR inducer requirements: identification of a critical determinant of AlcR inducer responsiveness and construction of an ...

Schools

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• University of Texas Medical School At San Antonio

Doctors Specialties

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• Diagnostic Radiology
• Radiology

Accepted Insurances

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Education

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• University of Texas Health Science Center
• University of Texas Medical School

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