Comparison of the Schoolfield (non linear, Arrhenius) model and the Square Root model for predicting bacterial growth in foods—a reply to K.R. Davey

1989 ◽  
Vol 6 (4) ◽  
pp. 308-309 ◽  
Author(s):  
D.C. Kilsby
Keyword(s):  
Bacterial Growth ◽  
Square Root ◽  
Arrhenius Model ◽  
Root Model ◽  
Non Linear ◽  
Square Root Model

Optimal temperature input design for estimation of the Square Root model parameters: parameter accuracy and model validity restrictions

2002 ◽  
Vol 73 (2-3) ◽  
pp. 145-157 ◽  
Author(s):  
Kristel Bernaerts ◽  
Roos D. Servaes ◽  
Steven Kooyman ◽  
Karina J. Versyck ◽  
Jan F. Van Impe
Keyword(s):  
Model Parameters ◽  
Square Root ◽  
Optimal Temperature ◽  
Model Validity ◽  
Input Design ◽  
Root Model ◽  
Square Root Model

Application of a Predictive Growth Model of Pseudomonas spp. for Estimating Shelf Life of Fresh Agaricus bisporus

2017 ◽  
Vol 80 (10) ◽  
pp. 1676-1681 ◽  
Author(s):  
Jianming Wang ◽  
Junran Chen ◽  
Yunfeng Hu ◽  
Hanyan Hu ◽  
Guohua Liu ◽  
...  
Keyword(s):  
Shelf Life ◽  
Growth Curve ◽  
Agaricus Bisporus ◽  
Gompertz Model ◽  
Square Root ◽  
Pseudomonas Spp ◽  
Root Model ◽  
Spoilage Microorganisms ◽  
Square Root Model ◽  
Modified Gompertz Model

ABSTRACT For prediction of the shelf life of the mushroom Agaricus bisporus, the growth curve of the main spoilage microorganisms was studied under isothermal conditions at 2 to 22°C with a modified Gompertz model. The effect of temperature on the growth parameters for the main spoilage microorganisms was quantified and modeled using the square root model. Pseudomonas spp. were the main microorganisms causing A. bisporus decay, and the modified Gompertz model was useful for modelling the growth curve of Pseudomonas spp. All the bias factors values of the model were close to 1. By combining the modified Gompertz model with the square root model, a prediction model to estimate the shelf life of A. bisporus as a function of storage temperature was developed. The model was validated for A. bisporus stored at 6, 12, and 18°C, and adequate agreement was found between the experimental and predicted data.

Denitrification and ammonification at low soil temperatures

1991 ◽  
Vol 71 (3) ◽  
pp. 293-303 ◽  
Author(s):  
S. Dorland ◽  
E. G. Beauchamp
Keyword(s):  
Maximum Amount ◽  
Denitrification Rate ◽  
Threshold Temperature ◽  
Square Root ◽  
Organic C ◽  
Nitrite Production ◽  
Root Model ◽  
Incubation Periods ◽  
Soil Temperatures ◽  
Square Root Model

A laboratory study was conducted to determine the effects of temperatures from −2 to 25 °C on denitrification and ammonification in anaerobic soil treated with alfalfa or glucose. Organic C substrate as alfalfa or glucose increased denitrification rates at all temperatures within this range and lowered the threshold temperature at which denitrification occurred. The threshold temperature for denitrification was as low as −2 °C in unfrozen (supercooled) soil in contrast to most other studies where the threshold temperature was reported to be at or above 0 °C. When soil was frozen at −2 °C, the denitrification rate was much lower than in unfrozen soil at the same temperature. A square root model was employed which showed that the square root of the denitrification rate was linearly related to temperature from −2 to 25 °C. The maximum amount of [Formula: see text] produced during the incubation periods generally decreased from −2 to 25 °C and was greatest when glucose and especially alfalfa were added. The rate of ammonification increased with addition of alfalfa but the quantities of [Formula: see text] produced generally decreased from 25 to −2 °C. Key words: Threshold temperature, frozen vs. unfrozen soil, nitrite production, square root model

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