An experiment was conducted to study energy retained (TER) as fat (TERF) and protein (TERP) in 3 strains of birds with different growth rate; commercial broilers, Barred Plymouth Rock, and Leghorns. Birds were fed ad libitum a diet providing 3,100 kcal of AMEn/kg and 20% CP from 0 to 42 d. Body composition, TER, TERF, and TERP were determined at 0, 7, 10, 15, 19, 23, 28, 33, 37, and 42 d of age...

The microbial contamination of central air conditioning system is one of the important factors that affect the indoor air quality. Actual measurement and analysis were carried out on microbial contamination in central air conditioning system at a venue in Dalian, China. Illumina miseq method was used and three fungal samples of two units were analysed by high throughput sequencing. Results show...

Mathematical models are often used to predict microbial growth in food products. An important class of these models involves the adaptation of classical sigmoid functions, such as the Gompertz and logistic functions. This study aimed to validate the use of the modified Richards model in various situations, which have not previously been tested. The model was obtained through solving a system of...

Sucrose thermal degradation is an important reaction in the food industry. When in concentrated and neutral solutions, pure sucrose presents a lag phase in the reaction. This work aimed at: (i) modelling sucrose thermal degradation autocatalytic behaviour and (ii) studying the concentration and temperature effects on kinetic parameters. Isothermal experiments were conducted at temperatures rang...

Mathematical models of population growth have been constructed to provide an abstract of some significant aspect of true ecological situation. In this paper, we put some models where the parameters of the biological growth model systematically change over time. Verhust (1838) first proposed three-parameter model for the growth of single-species populations [1,5,9] that shows a logistic sigmoid ...

A generalisation of the Susceptible-Infectious model is made to include a time-dependent transmission rate, which leads close analytical expression in terms logistic function. The solution can be applied any continuous function chosen describe evolution rate with time. Taking inspiration from real data Covid-19, for case cumulative confirmed positives and deaths, we propose an exponentially dec...

The fishery of the spotted sardinella, Amblygaster sirm (Walbaus, 1792) has been most important catch in Egyptian waters. age and growth A. were updated for Red Sea, waters, addition to an evaluation captures over last 12 years (2006–2018). To specify age, more than one reader was determined present study. As a result, recorded life history ranged from 0 3 old. parameters investigated with vari...

A proposal for monitoring and evaluating the performance of Brazilian states against COVID-19 is presented, employing a set non-linear growth functions. This necessary given its unprecedented nature in face public policies known to society 21st century. The daily data on accumulated cases 27 were collected Ministry Health Brazil’s website. As 17-May-2020, logistic, Gompertz, exponential functio...