Almost perfect fits of the Gompertz equation to the growth in length of tail regenerates in the lizard, Lacerta lepida, and the newt, Notophthalmus viridescens, were obtained. Comparison of certain parameters of the equation with published mitotic index data suggests that the Gompertz equation characterizes each system at least from the time that significant mitotic activity is first observed h...

The main objective of this study was to compare the goodness of fit of five non-linear growth models, i.e. Brody, Gompertz, Logistic, Richards and von Bertalanffy in different animals. It also aimed to evaluate the influence of the shape parameter on the growth curve. To accomplish this task, published growth data of 14 different groups of animals were used and four goodness of fit statistics w...

Various readily obtainable ‘marine’ media from fishery residues were evaluated against a common commercial medium for their effectiveness for promoting growth of different bacteria. The micro-organisms investigated (genera Pseudomonas, Vibrio, Roseobacter) are of interest to aquaculture either for their pathogenic or probiotic character. Comparisons between the media were centered on the most i...

Determining the mathematical dynamics and associated parameter values that should be used to accurately reflect tumor growth continues to be of interest to mathematical modelers, experimentalists and practitioners. However, while there are several competing canonical tumor growth models that are often implemented, how to determine which of the models should be used for which tumor types remains...

This study was aimed to obtain the growth curve of body weight in male layer chickens (Lohman MB 202) based on Logistic and Gompertz models. The frequently data from one day age adult were used for prediction. Total thousand birds private sector poultry farm Tasikmalaya Regency, Indonesia this as source. estimation calculated (L) (G) models using Curve Expert 1.4. computer program.The final (as...

In this study, it is explained how the Richards model, which one of sigmoid growth models, transformed into a mechanical model with biologically significant parameters such as maximum value, lag time and specific rate. Detail transformations containing 4 calculated help first second derivatives were given. order to test accuracy prediction values analyzed by using height data E. Camaldulensis D...

Evaluating the behavior of fruit width and length characters throughout pepper crop cycle is essential for researchers in decision-making aimed at developing appropriate management techniques harvesting fruits proper growth stages. The Nonlinear Mixed-Effect Models (NLME) method recommended to jointly model residuals entire database, including group effects, describe curves. This work compared ...

International Digital Divide is an imbalance state of ICT penetration between countries. This paper analyzes the current status and trends of international digital divide, adopts Gompertz technology diffusion model to verify the determinants of ICT penetration level and diffusion rate separately. Finally, China should use “policy levers” to strengthen international trade cooperation, improve th...

The time dependence of the h-index is analyzed by considering the average behaviour of h as a function of the academic age AA for about 1400 Italian physicists, with career lengths spanning from 3 to 46 years. The individual h-index is strongly correlated with the square root of the total citations NC : h ≈ 0.53 √ NC . For academic ages ranging from 12 to 24 years, the distribution of the time ...