Procedure for Evaluating the Effects of 2,450- Megahertz Microwaves upon
            <i>Streptococcus faecalis</i>
            and
            <i>Saccharomyces cerevisiae</i>

Lechowich, R. V.; Beuchat, Larry R.; Fox, Kenneth; Webster, F. H.

doi:10.1128/am.17.1.106-110.1969

Cited by 22 publications

(3 citation statements)

References 7 publications

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“…Welt et al [ 11 ] also found no difference between conventional and microwave deactivation of Clostridium sporogenes at 90°C, 100°C, and 110°C. Lechowich et al [ 12 ], Vela et al [ 13 ], Rosén [ 14 ] also found that the deactivation of several bacteria, including Streptococcus faecalis (later classified as Enterococcus faecalis ) and Saccharomyces cerevisiae , under microwave irradiation resulted from the dielectric heating.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Models of Cobalt and Iron Ions Catalyzed Microwave Bacterial Deactivation

Reznik

Benjamin

Williams

2007

IJERPH

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Time differences for Enterococcus faecalis, Staphylococcus aureus, and Escherichia coli survival during microwave irradiation (power 130 W) in the presence of aqueous cobalt and iron ions were investigated. Measured dependencies had “bell” shape forms with maximum bacterial viability between 1 – 2 min becoming insignificant at 3 minutes. The deactivation time for E. faecalis, S. aureus and E.coli in the presence of metal ions were smaller compared to a water control (4–5 min). Although various sensitivities to the metal ions were observed, S. aureus and E. coli and were the most sensitive for cobalt and iron, respectively. The rapid reduction of viable bacteria during microwave treatment in the presence of metal ions could be explained by increased metal ion penetration into bacteria. Additionally, microwave irradiation may have increased the kinetic energy of the metal ions resulting in lower survival rates. The proposed mathematical model for microwave heating took into account the “growth” and “death” factors of the bacteria, forming second degree polynomial functions. Good relationships were found between the proposed mathematical models and the experimental data for bacterial deactivation (coefficient of correlation 0.91 – 0.99).

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Section: Introductionmentioning

confidence: 99%

Mathematical Models of Cobalt and Iron Ions Catalyzed Microwave Bacterial Deactivation

Reznik

Benjamin

Williams

2007

IJERPH

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“…A growing body of researches had been published on the effect of such radiation on the growth of different microorganisms which due to either thermal and non-thermal effect. Most of the researchers are with thermal effect in which the exposed cells absorb microwave energy and leading to heating that cause denaturation of cellular enzymes and proteins [3][4][5][6][7][8][9][10]. On the other hand, some of the researchers concluded that the bacterial growth was increased when exposed to low power levels of radiation [11].…”

Section: -Introductionmentioning

confidence: 99%

Effect of Microwave Radiation on the Viability of Escherichia Coli and Staphylococcus Aureus

T.AHMED,

A.HASSAN,

Y.HUSSEIN

et al. 2022

MINAR Journal

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Sterilization and decontamination of food like dairy products from bacteria that cause food poisoning is the paramount goal of food industry. Recently microwave ovens have been widely used for heating of food. This study was carried out in order to show the effect of microwave radiation on the viability of E.coli and Staphylococcus aureus in the milk. Known concentrations of E.coli and Staph,aureus in the local sheep milk were exposed to microwave radiation at 40%, 80% and 100% power levels at different time durations in seconds (0,5,30,60,120) and 0 time regarded as a control. A significant reduction in the number of colonies was detected with increasing the time of exposure for three power levels of microwave radiation compared to control. The killing effect of radiation was more associated with increasing the power level and time of exposure, in which the percentages of bacterial reduction were 12.1, 48.4 and 95.1 for E. coli at power level 40%,80% and 100% respectively while for Staph. aureus were 55.9, 92.7 and 80.7. Staph. aurues. The reduction percentages of E. coli after 120 seconds of exposure to power levels 40%,80% and 100% were 96.6, 100.0 and 98.7 respectively, while for Staph. aureus were 82.5, 99.08 and 99. It can be concluded from the results of this study that microwave radiation can be used as effective method for removing of bacteria that can cause food poisoning.

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“…Conversely, some believe that thermal effect of the microwave alone can have a bactericidal and sporicidal effect, especially in liquid systems [17, 18]. Vela and Wu [19] observed that dry or lyophilized microorganisms are not capable of absorbing microwave energy.…”

mentioning

confidence: 99%

The effect of gamma and microwave radiation sterilization on periodontological grafts for microbiological evaluation

Bargh

Silindir-Gunay

Özer

et al. 2021

APMIS

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Periodontological grafts are materials used in dentistry to regenerate lost gingival soft tissues or bone parts. In the case of direct contact with blood, the possibility of disease transmission from the source to the patient is high. This source can be an animal or a human. Therefore, the sterilization of grafts before implanting to the patient is of significant importance. The purpose of this study was to evaluate gamma radiation and microwave sterilization processes from microbiological and sterility perspectives and to compare the effectiveness of these two sterilization methods. Grafts were irradiated with 2, 4, 5, 10, 25 and 50 kGy doses of gamma radiation. Another group of same materials was irradiated by microwave for 1, 2, 3 and 4 min at 24,500 MHz and 900 W. Gamma radiation and microwave sterilization methods were evaluated as successful at minimum doses as 5 kGy and 3 min, respectively. Both gamma and microwave sterilization successfu lly sterilized periodontological grafts coded as PBG1, HBG1, HL1, PDG1, MBG3, MDG2 and PDG3. Moreover, microwave sterilization can be used as an alternative novel method to gamma radiation sterilization.

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Procedure for Evaluating the Effects of 2,450- Megahertz Microwaves upon Streptococcus faecalis and Saccharomyces cerevisiae

Cited by 22 publications

References 7 publications

Mathematical Models of Cobalt and Iron Ions Catalyzed Microwave Bacterial Deactivation

Mathematical Models of Cobalt and Iron Ions Catalyzed Microwave Bacterial Deactivation

Effect of Microwave Radiation on the Viability of Escherichia Coli and Staphylococcus Aureus

The effect of gamma and microwave radiation sterilization on periodontological grafts for microbiological evaluation

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