Effect of σ&lt;sup&gt;S&lt;/sup&gt; on σ&lt;sup&gt;E&lt;/sup&gt;-Directed Cell Lysis in &lt;i&gt;Escherichia coli &lt;/i&gt;Early Stationary Phase

Kabir, Shahinur; Yamashita, Daisuke; Noor, Rashed; Yamada, Mamoru

doi:10.1159/000085791

Cited by 18 publications

(37 citation statements)

References 36 publications

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“…Nevertheless, our data clearly showed the physiological influence of external oxidative stress in E. coli and Pseudomonas spp., which is in agreement with our previous studies (Kabir et al, 2004;Munna et al, 2013), and provided new information on the defense strategies of Salmonella spp. and Bacillus spp.…”

Section: Confirmative Demonstration Of E Coli and Pseudomonas Viabilsupporting

confidence: 93%

“…After adjusting the optical density of the preculture to 0.1 at 600 nm (OD 600 ), 30 µL of each was introduced into 2 different 30-mL sets of NB and incubated at 37 °C with shaking at 100 rpm. After 10 h of growth, 6 mM H 2 O 2 was aseptically added into 1 set of nutrient broth and the other set without H 2 O 2 was considered as the control (Kabir et al, 2004;Munna et al, 2013). At every 12-h interval, cell growth was monitored by measuring OD 600 , and the formation of colony-forming units (CFUs) was estimated by counting the colonies up to 72 h at every 24-h interval (Noor et al, 2009b;Munna et al, 2013;Noor et al, 2013).…”

Section: Bacterial Stain Medium and Culture Conditionmentioning

confidence: 99%

“…Earlier observation of the decline of cell viability in the E. coli W3110 strain after the addition of 3 mM H 2 O 2 led us to examine the similar influence on a different strain of E. coli in our laboratory (Kabir et al, 2004;Munna et al, 2013). A simulation of such a stress-responsive event, with different variables like the increased concentration of H 2 O 2 , the phase of addition of the oxidant, or the response in other strains or species, would largely aid the overall understanding of the cellular responses.…”

Section: Introductionmentioning

confidence: 99%

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Study of exogenous oxidative stress response in Escherichia coli, Pseudomonas spp., Bacillus spp., and Salmonella spp.

Nur¹,

Munna²,

Noor³

2014

Turk J Biol

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With a previous observation of Escherichia coli growth cessation with the supplementation of 3 mM hydrogen peroxide (H 2 O 2 ) at the late log phase, the current study further demonstrated the consequences of the addition of an increased concentration (6 mM) of H 2 O 2 and further extended the investigation on such an oxidant's impact on the growth of Salmonella spp., Pseudomonas spp., and Bacillus spp. Cell culturability was measured through the enumeration of colony-forming units (CFUs) on agar plates for up to 72 h. Subsequent changes in cell morphology and arrangements were monitored, and the cell viability was simultaneously retraced by spot tests. A sharp decline in the culturable cells of E. coli was observed after 48 h with a large mass of cell aggregates upon addition of H 2 O 2 , while Pseudomonas spp. lost viability after 36 h. Impaired morphology of such stressed cells was comparable to those of the untreated cells. Notably, Pseudomonas cells were more prone to oxidative damage compared to E. coli. In contrast, the impact of H 2 O 2 was insignificant in the case of Salmonella spp. and Bacillus spp., suggestive of a stringent defense mechanism against oxidative stress.

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Section: Confirmative Demonstration Of E Coli and Pseudomonas Viabilsupporting

confidence: 93%

Section: Bacterial Stain Medium and Culture Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of exogenous oxidative stress response in Escherichia coli, Pseudomonas spp., Bacillus spp., and Salmonella spp.

Nur¹,

Munna²,

Noor³

2014

Turk J Biol

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“…However, fresh vegetables may come in contact with an array of microorganisms resulting in various diseases [5,7,17,22,27,30,33]. Contamination and growth of spoilage microorganisms usually limit the shelf life of vegetables [19,28]. Growth of microorganisms in vegetables depends on various intrinsic and extrinsic factors, including acidity, water activity, redox potential, etc.…”

Section: Introductionmentioning

confidence: 99%

Determination of Microbial Growth and Survival in Salad Vegetables through in Vitro Challenge Test

Feroz¹,

Senjuti²,

Noor³

2013

IJNFS

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Current study attempted to examine the growth and subsequent survival of the common spoilage bacteria in vegetable samples collected from Dhaka, Bangladesh. Carrot, cucumber, tomato and lettuce samples were obtained from local markets and rendered free of contaminants. Each sample was then inoculated separately with an array of 9 test bacteria, resulting in the initial load of 10 5 cfu/g. The results revealed more than 6-log reduction of Salmonella spp. in carrot and tomato samples, Shigella spp. in carrot, lettuce and cucumber samples, Aeromonas spp. in tomato samples, Pseudomonas spp. in lettuce samples, and Listeria spp. in cucumber samples. No significant reduction in E. coli was observed in the cucumber samples, while in carrots and tomato samples, approximately 2-log reductions was found. Demonstration of the capacity of vegetables to influence microbial growth would further aid in the maintenance of the food quality and stability as well as their shelf life. Conducting such experiments after the quantification of spoiling microorganisms thus imparts a complete bacteriological profile, which is of public health significance.

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“…ability to form colonies on the agar plates when they were exposed to oxidative stress. It should be stated that raise of temperature can have a close impact on the occurrence of oxidative stress (5,7,21,22).…”

mentioning

confidence: 99%

Influence of temperature on the growth of fecal coliform

2017

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The cellular response against environmental stresses is one of the most highly conserved regulatory features among all organisms. The exposure of cells to stresses such as heat shock leads to the accumulation of partially and fully denatured proteins that interfere with normal cellular function. Present study was designed to examine the growth and physiology of Escherichia coli at different temperatures in our laboratory condition. With a previous observation of Escherichia coli growth cessation by the increase in temperature on different culture media, current study further extended the examination of the influence of temperature on the growth behavior of fecal coliform on minimal media, a slight retardation in the colony and cell morphology was noticed for fecal coliform at 47 °C within 36 hours to 72 hours of incubation. Consistent result was also found in spot test for fecal species at 45°C.Stamford Journal of Microbiology, Vol.6(1) 2016: 20-23

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Effect of σ<sup>S</sup> on σ<sup>E</sup>-Directed Cell Lysis in <i>Escherichia coli </i>Early Stationary Phase

Cited by 18 publications

References 36 publications

Study of exogenous oxidative stress response in Escherichia coli, Pseudomonas spp., Bacillus spp., and Salmonella spp.

Study of exogenous oxidative stress response in Escherichia coli, Pseudomonas spp., Bacillus spp., and Salmonella spp.

Determination of Microbial Growth and Survival in Salad Vegetables through in Vitro Challenge Test

Influence of temperature on the growth of fecal coliform

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