On the lag phase and initial decline of microbial growth curves

Yates, George T.; Smotzer, Thomas

doi:10.1016/j.jtbi.2006.08.017

Cited by 72 publications

(52 citation statements)

References 11 publications

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“…The stationary phase follows when nutrients are limited or other environmental conditions restrict the number of cells that can be supported. Finally, cellular death and a declining population occur when the surroundings cannot maintain the population (Yates and Smotzer 2007).…”

Section: Resultsmentioning

confidence: 99%

Kinetics of biodegradation of diethylketone by Arthrobacter viscosus

2011

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The performance of an Arthrobacter viscosus culture to remove diethylketone from aqueous solutions was evaluated. The effect of initial concentration of diethylketone on the growth of the bacteria was evaluated for the range of concentration between 0 and 4.8 g/l, aiming to evaluate a possible toxicological effect. The maximum specific growth rate achieved is 0.221 h(-1) at 1.6 g/l of initial diethylketone concentration, suggesting that for higher concentrations an inhibitory effect on the growth occurs. The removal percentages obtained were approximately 88%, for all the initial concentrations tested. The kinetic parameters were estimated using four growth kinetic models for biodegradation of organic compounds available in the literature. The experimental data found is well fitted by the Haldane model (R (2) = 1) as compared to Monod model (R (2) = 0.99), Powell (R (2) = 0.82) and Loung model (R (2) = 0.95). The biodegradation of diethylketone using concentrated biomass was studied for an initial diethylketone concentration ranging from 0.8-3.9 g/l in a batch with recirculation mode of operation. The biodegradation rate found followed the pseudo-second order kinetics and the resulting kinetic parameters are reported. The removal percentages obtained were approximately 100%, for all the initial concentrations tested, suggesting that the increment on the biomass concentration allows better results in terms of removal of diethylketone. This study showed that these bacteria are very effective for the removal of diethylketone from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

Kinetics of biodegradation of diethylketone by Arthrobacter viscosus

2011

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“…Dependent on the possible build up of environmental toxins or depletion of bioavailable substrates (Yates and Smotzer 2007), the microbial population may enter the death phase and the viable number of microbes will decrease. Based on this growth cycle, almost all organic compounds are degradable given the proper environmental, physicochemical and time conditions (Talley and Sleeper 2006).…”

Section: Factors Influencing Bioremediationmentioning

confidence: 99%

A comprehensive overview of elements in bioremediation

Juwarkar

Singh

Mudhoo

2010

Rev Environ Sci Biotechnol

304

128

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Sustainable development requires the development and promotion of environmental management and a constant search for green technologies to treat a wide range of aquatic and terrestrial habitats contaminated by increasing anthropogenic activities. Bioremediation is an increasingly popular alternative to conventional methods for treating waste compounds and media with the possibility to degrade contaminants using natural microbial activity mediated by different consortia of microbial strains. Many studies about bioremediation have been reported and the scientific literature has revealed the progressive emergence of various bioremediation techniques. In this review, we discuss the various in situ and ex situ bioremediation techniques and elaborate on the anaerobic digestion technology, phytoremediation, hyperaccumulation, composting and biosorption for their effectiveness in the biotreatment, stabilization and eventually overall remediation of contaminated strata and environments. The review ends with a note on the recent advances genetic engineering and nanotechnology have had in improving bioremediation. Case studies have also been extensively revisited to support the discussions on biosorption of heavy metals, gene probes used in molecular diagnostics, bioremediation studies of contaminants in vadose soils, bioremediation of oil contaminated soils, bioremediation of contaminants from mining sites, air sparging, slurry phase bioremediation, phytoremediation studies for pollutants and heavy metal hyperaccumulators, and vermicomposting.

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“…According to the results, the microbial counts of mesophilic aerobic bacteria, molds and yeasts on mango cubes showed a significant (P<0.05) reduction after soaking in noni juice, in contrast with the control groups, which showed an increase, especially for mesophilic aerobic bacteria and yeasts. However, aerobic mesophilic bacterial count decreased at 3rd day in case of control mango cubes and thereafter increased again, which is characteristic of the lag phase because cells undergo intracellular changes in an effort to adjust to a new environment (Yates and Smotzer 2007), as in this case to the storage temperature of 6°C. On the other hand, the mango cubes soaked in noni juice for 5.0 min showed significantly (P<0.05) lower microbial counts during storage at 6°C than mango cubes soaked in noni juice for 2.5 min.…”

Section: Statistical Analysesmentioning

confidence: 96%

Effect of soaking in noni (Morinda citrifolia) juice on the microbiological and color behavior of Haden minimally processed mango

et al. 2014

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The purpose of this study was to evaluate the effect of soaking in noni juice on the microbiological and color behavior of minimally processed mango. Two batches of Haden mango cubes were treated by immersion in noni juice for 2.5 or 5.0 min. Each batch was packed in polypropylene boxes and stored at 6°C for up to 15 days; in addition, a control group of mango cubes was prepared by immersion in sterile water for the same duration. According to the results, the soaking of mango cubes in noni juice had an antimicrobial effect on mesophilic aerobic bacteria, molds and yeasts during storage at 6°C for 15 days, without significantly (P<0.05) affecting the CIE L*, a*, b*, chroma and hue angle values, in comparison with the control after 12 days of storage. The noni juice soaking treatment was demonstrated to be a potentially valuable technology for decontamination of fresh-cut fruit surfaces.

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On the lag phase and initial decline of microbial growth curves

Cited by 72 publications

References 11 publications

Kinetics of biodegradation of diethylketone by Arthrobacter viscosus

Kinetics of biodegradation of diethylketone by Arthrobacter viscosus

A comprehensive overview of elements in bioremediation

Effect of soaking in noni (Morinda citrifolia) juice on the microbiological and color behavior of Haden minimally processed mango

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