George G. Khachatourians

High pH during Trisodium Phosphate Treatment Causes Membrane Damage and Destruction of Salmonella enterica Serovar Enteritidis

Sampathkumar, Balamurugan, Khachatourians, George G., Korber, Darren R.

Trisodium phosphate (TSP) is now widely used during the processing of poultry and red meats, but the mechanism whereby it inactivates gram-negative bacteria such Salmonella spp. remains unclear....

Carbohydrate Storage in the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Low, Nicholas H., Khachatourians, George G.

The entomopathogenic fungus Beauveria bassiana was grown in 1% (wt/vol) gelatin-liquid media singly supplemented with a monosaccharide (glucose or fructose), a disaccharide (maltose or trehalose), a...

Identification of Molecular Variants in Mitochondrial DNAs of Members of the Genera Beauveria, Verticillium, Paecilomyces, Tolypocladium, and Metarhizium

Hegedus, Dwayne D., Khachatourians, George G.

A set of five mitochondrial (mt) probes derived from a strain of Beauveria bassiana was used to evaluate the similarity of mtDNAs from 15 additional isolates of this fungus and five genera of other...

Purification and Properties of an Extracellular Protease Produced by the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Khachatourians, George G.

Beauveria bassiana GK2016 grown in a medium with gelatin as the sole carbon and nitrogen source produced an extracellular protease. The protease production was highest when the fungus was grown on a...

N-Acetyl-d-Glucosamine-Mediated Regulation of Extracellular Protease in the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Khachatourians, George G.

The entomopathogenic fungus Beauveria bassiana GK2016 grown in a liquid medium incorporating gelatin as the sole carbon and nitrogen source produced an extracellular serine protease (molecular...

Isolation of Noninhibitory Strains of Zymomonas mobilis

Haffie, Thomas L., Louie, Paul W., Khachatourians, George G.

Wild-type Zymomonas mobilis strains inhibit the growth of Escherichia coli. We report the first isolation of noninhibitory strains, called Zymomonas inhibition negative (Zin−), after treatment with...

Improved Method for Detection of Starch Hydrolysis

Dhawale, Motiram R., Wilson, J. Jeffrey, Khachatourians, George G., Ingledew, W. Mike

A new starch hydrolysis detection method which does not rely on iodine staining or the use of color-complexed starch is described. A linear relationship was obtained with agar-starch plates when net...

Effects of Fusariotoxin T-2 on Saccharomyces cerevisiae and Saccharomyces carlsbergensis

Schappert, Keith T., Khachatourians, George G.

A Fusarium metabolite, T-2 toxin, inhibits the growth of Saccharomyces carlsbergensis and Saccharomyces cerevisiae. The growth inhibitory concentrations of T-2 toxin were 40 and 100 μg/ml,...

Inhibition of Messenger Ribonucleic Acid Synthesis in Escherichia coli by Thiolutin

Khachatourians, George G., Tipper, Donald J.

Thiolutin, at concentrations of 5 to 40 μg/ml, inhibited the induced synthesis of β-galactosidase in Escherichia coli CA8000. Thiolutin had no effect on the rate of in vitro hydrolysis of...

Cell Growth and Division in Escherichia coli: a Common Genetic Control Involved in Cell Division and Minicell Formation

Khachatourians, George G., Clark, D. Joseph, Adler, Howard I., Hardigree, Alice A.

Escherichia coli Div 124(ts) is a conditional-lethal cell division mutant formed from a cross between a mutant that produces polar anucleated minicells and a temperature-sensitive cell division...

Constitutive and heat-inducible heat shock element binding activities of heat shock factor in a group of filamentous fungi

Xavier, Ilungo J., Khachatourians, George G., Ovsenek, Nick

This study represents the initial characterization of the heat shock factor (HSF) in filamentous fungi. We demonstrate that HSFs from Beauveria bassiana, Metarhizium anisopliae, Tolypocladium nivea,...

Treatment of Salmonella enterica Serovar Enteritidis with a Sublethal Concentration of Trisodium Phosphate or Alkaline pH Induces Thermotolerance

Sampathkumar, Balamurugan, Khachatourians, George G., Korber, Darren R.

The responses of Salmonella enterica serovar Enteritidis to a sublethal dose of trisodium phosphate (TSP) and its equivalent alkaline pH made with NaOH were examined. Pretreatment of S. enterica...

High pH during Trisodium Phosphate Treatment Causes Membrane Damage and Destruction of Salmonella enterica Serovar Enteritidis

Sampathkumar, Balamurugan, Khachatourians, George G., Korber, Darren R.

Trisodium phosphate (TSP) is now widely used during the processing of poultry and red meats, but the mechanism whereby it inactivates gram-negative bacteria such Salmonella spp. remains unclear....

Carbohydrate Storage in the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Low, Nicholas H., Khachatourians, George G.

The entomopathogenic fungus Beauveria bassiana was grown in 1% (wt/vol) gelatin-liquid media singly supplemented with a monosaccharide (glucose or fructose), a disaccharide (maltose or trehalose), a...

Identification of Molecular Variants in Mitochondrial DNAs of Members of the Genera Beauveria, Verticillium, Paecilomyces, Tolypocladium, and Metarhizium

Hegedus, Dwayne D., Khachatourians, George G.

A set of five mitochondrial (mt) probes derived from a strain of Beauveria bassiana was used to evaluate the similarity of mtDNAs from 15 additional isolates of this fungus and five genera of other...

Purification and Properties of an Extracellular Protease Produced by the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Khachatourians, George G.

Beauveria bassiana GK2016 grown in a medium with gelatin as the sole carbon and nitrogen source produced an extracellular protease. The protease production was highest when the fungus was grown on a...

N-Acetyl-d-Glucosamine-Mediated Regulation of Extracellular Protease in the Entomopathogenic Fungus Beauveria bassiana

Bidochka, Michael J., Khachatourians, George G.

The entomopathogenic fungus Beauveria bassiana GK2016 grown in a liquid medium incorporating gelatin as the sole carbon and nitrogen source produced an extracellular serine protease (molecular...

Isolation of Noninhibitory Strains of Zymomonas mobilis

Haffie, Thomas L., Louie, Paul W., Khachatourians, George G.

Wild-type Zymomonas mobilis strains inhibit the growth of Escherichia coli. We report the first isolation of noninhibitory strains, called Zymomonas inhibition negative (Zin−), after treatment with...

Improved Method for Detection of Starch Hydrolysis

Dhawale, Motiram R., Wilson, J. Jeffrey, Khachatourians, George G., Ingledew, W. Mike

A new starch hydrolysis detection method which does not rely on iodine staining or the use of color-complexed starch is described. A linear relationship was obtained with agar-starch plates when net...

Effects of Fusariotoxin T-2 on Saccharomyces cerevisiae and Saccharomyces carlsbergensis

Schappert, Keith T., Khachatourians, George G.

A Fusarium metabolite, T-2 toxin, inhibits the growth of Saccharomyces carlsbergensis and Saccharomyces cerevisiae. The growth inhibitory concentrations of T-2 toxin were 40 and 100 μg/ml,...

Inhibition of Messenger Ribonucleic Acid Synthesis in Escherichia coli by Thiolutin

Khachatourians, George G., Tipper, Donald J.

Thiolutin, at concentrations of 5 to 40 μg/ml, inhibited the induced synthesis of β-galactosidase in Escherichia coli CA8000. Thiolutin had no effect on the rate of in vitro hydrolysis of...

Cell Growth and Division in Escherichia coli: a Common Genetic Control Involved in Cell Division and Minicell Formation

Khachatourians, George G., Clark, D. Joseph, Adler, Howard I., Hardigree, Alice A.

Escherichia coli Div 124(ts) is a conditional-lethal cell division mutant formed from a cross between a mutant that produces polar anucleated minicells and a temperature-sensitive cell division...

Constitutive and heat-inducible heat shock element binding activities of heat shock factor in a group of filamentous fungi

Xavier, Ilungo J., Khachatourians, George G., Ovsenek, Nick

This study represents the initial characterization of the heat shock factor (HSF) in filamentous fungi. We demonstrate that HSFs from Beauveria bassiana, Metarhizium anisopliae, Tolypocladium nivea,...

Treatment of Salmonella enterica Serovar Enteritidis with a Sublethal Concentration of Trisodium Phosphate or Alkaline pH Induces Thermotolerance

Sampathkumar, Balamurugan, Khachatourians, George G., Korber, Darren R.

The responses of Salmonella enterica serovar Enteritidis to a sublethal dose of trisodium phosphate (TSP) and its equivalent alkaline pH made with NaOH were examined. Pretreatment of S. enterica...

STREAMLINING THE RISK ANALYSIS PROCESS AND ENSURING THE OPTIMAL ORGANIZATIONS FOR FOOD SAFETY: THE CASE APPLICATION TO BIOTECHNOLOGY OF FUSARIUM SPECIES

Pawlik, Darcy R., Procyshyn, Tara L., Khachatourians, George G., Phillips, Peter W.B.

Food safety and security may be improved by using technological innovation. However, hostile consumer reaction to scientific solutions is commonly accompanied. The case analysis of food and...