Angelina Guzzo

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luxAB gene fusions in the Escherichia coli genome were used to screen for clones displaying transcriptional changes in the presence of aluminum. One clone was found that contained a luciferase gene fusion in which transcription was increased in the presence of aluminum and which was subsequently shown to be induced by copper, iron, and nickel. Cloning of(More)
A ColE1-based plasmid for transcriptional gene fusions was constructed that contains both the promoterless luxAB genes of Vibrio harveyi and a tet marker within the inverted repeats of a left end-truncated Tn5 element. Introduction of this plasmid into an Escherichia coli strain containing a plasmid (pTF421) that overproduces ColE1 RNA1 (and thus inhibits(More)
Luciferase-based biosensors are becoming increasingly used for environmental monitoring. A transcriptional fusion of the Vibrio harveyi luxAB genes (encoding bacterial luciferase) to the fliC gene of Escherichia coli was constructed and luminescence shown to be induced (in liquid media) in the presence of 1-10 micrograms/ml aluminum, but not copper, iron or(More)
Arsenite is extremely toxic and, though non-mutagenic, is a carcinogen. To determine the effects of arsenite on changes in cell physiology, we searched for genes in HeLa cells whose mRNAs are more abundant after cellular exposure to arsenite. A cDNA subtraction was performed between cDNA synthesized from HeLa cells grown in the absence and presence of 5(More)
From a library of 3000 Escherichia coli clones, each containing a single, chromosomally located luxAB transcriptional gene fusion, one clone was found in which luminescence increased in the presence of 1 to 50 ppm of NiSO4. A molecular analysis revealed that the insertion occurred within the celF gene of E. coli. This gene encodes the phospho-β-glucosidase(More)
The fluorescence of cattle rod outer segments (dried) and of rhodopsin in solution lies in the range of 575 to 600 millimicrons with a quantum efficiency of 0.005 if excitation is in the visible band near 500 millimicrons. The emission is abolished by bleaching at -196 degrees C but can be reversibly regenerated by irradiation with light of longer(More)
Gamma-aminobutyric acid type A receptors (GABA(A)Rs) that contain the alpha 5 subunit are expressed predominantly in the hippocampus, where they regulate learning and memory processes. Unlike conventional postsynaptic receptors, GABA(A)Rs containing the alpha 5 subunit (alpha 5 GABA(A)Rs) are localized primarily to extrasynaptic regions of neurons, where(More)
The ubiquitous Y-family of DNA polymerases, exemplified by the Escherichia coli UmuC protein (the catalytic subunit of DNA Pol V), possess the remarkable ability to replicate imperfect DNA templates that cannot be replicated by other types of DNA polymerases. Since this ability comes at the cost of a reduced fidelity, it is important that organisms manage(More)