Bacterial resistance to ultrasonic waves under pressure at nonlethal (manosonication) and lethal (manothermosonication) temperatures

Article Abstract:

The resistance of Streptococcus faecium, Listeria monocytogenes, Salmonella enteritidis and Aeromonas hydrophila to heat, manosonication (MS) and manothermosonication (MTS) treatments have been studied. The heat treatment decimal reduction times for the four bacterial strains were 7.1, O.34, O.024 and O.0096 min, respectively, at 62 degrees C. MS reduction times for the four bacterial strains were 4.0, 1.5, 0.86 and O.90 min, respectively, at 40 degrees C. The MS reduction times decreased by sixfold when the amplitude was increased to 150 micrometers and fivefold when the relative pressure was raised to 400 kPa.

Usage, Evaluation, Physiological aspects, Streptococcus, Sterilization (Disinfection), Salmonella enteritidis, Sterilization

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Influence of temperature and pressure on the lethality of ultrasound

Article Abstract:

The lethal effect of ultrasonic waves (UW) at different static pressures on Yersinia enterolitica was examined after the construction of a specially designed resistometer. The increase in the amplitude of UW exponentially decreased decimal reduction time values. When pressure was increased at a constant amplitude and temperature, values decreased. The lethality of UW under pressure was greater than that of heat treatment alone under pressure at temperatures of as much as 58 degrees C. Findings also showed that heat and UW under pressure seemed to act independently of each other.

Pressure, Pressure (Physics), Temperature, Yersinia enterocolitica

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Membrane damage and microbial inactivation by chlorine in the absence and presence of a chlorine-demanding substrate

Article Abstract:

The relationship between cell inactivation and membrane damage was studied in two gram-positive organisms, Listeria monocytogenes and Bacillus subtilis, and two gram-negative organisms, Yersinia enterocolitica and Escherichia coli, exposed to chlorine in the absence and presence of 150 ppm of organic matter. It is proposed that bacterial envelopes could play a role in cell inactivation by modulating the access of chlorine to the key targets within the cell.

Science & research, Genetic aspects, Cell interaction, Cell interactions, Gram-positive bacteria, Genetic research

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