Results 71 to 80 of about 958 (157)

Study of the Bacterial "Conversations" and Pattern Formation in the Quorum Sensing System using Numerical Simulation

open access: yesJournal of Human, Earth, and Future, 2022
Cell-to-cell communication processes in the bacterial world can be considered as a collective bacterial behavior, which is coordinated by chemical signaling molecules (autoinducers, quorum sensing molecules, or pheromones).
Sarangam Majumdar   +2 more
doaj   +1 more source

On some Free Boundary Problems of the Prey-predator Model [PDF]

open access: yes, 2014
In this paper we investigate some free boundary problems for the Lotka-Volterra type prey-predator model in one space dimension. The main objective is to understand the asymptotic behavior of the two species (prey and predator) spreading via a free ...
Wang, Mingxin
core   +1 more source

An Optimal Control Analysis of Dengue Fever

open access: yesInPrime, 2023
Dengue fever is one of the most infectious diseases in the world, according to data issued by the World Health Organization in 2014. It is responsible for a huge number of deaths each year around the world, particularly in tropical nations.
Nur Ilmayasinta   +3 more
doaj   +1 more source

Necrotic tumor growth: an analytic approach

open access: yes, 2012
The present paper deals with a free boundary problem modeling the growth process of necrotic multi-layer tumors. We prove the existence of flat stationary solutions and determine the linearization of our model at such an equilibrium.
A Friedman   +14 more
core   +1 more source

Model and Simulation of COVID-19 Transmission with Vaccination and Quarantine Interventions in Jember

open access: yesInPrime, 2023
In this study, we model the transmission of COVID-19 by considering vaccination and quarantine interventions. The focus of our study is to measure the effect of these two interventions on controlling the spread of COVID-19.
Faizal Rifky Fahreza   +2 more
doaj   +1 more source

Sets of double and triple weights of trees

open access: yes, 2011
Let T be a weighted tree with n leaves. Let D_{i,j} be the distance between the leaves i and j. Let D_{i,j,k}= (D_{i,j} + D_{j,k} +D_{i,k})/2. We will call such numbers "triple weights" of the tree.
Rubei, Elena
core   +1 more source

Growth rate, evolutionary entropy and ageing across the tree of life

open access: yesJournal of Biological Dynamics, 2023
The growth rate of a population serves as a measure of its Darwinian fitness, while its sensitivity indicates the intensity of selection. Generally, the sensitivity of r decreases with age, resulting in an expected increase in population mortality over ...
Jorge Buescu   +2 more
doaj   +1 more source

Global stability analysis and control of leptospirosis

open access: yesOpen Mathematics, 2016
The aim of this paper is to investigate the effectiveness and cost-effectiveness of leptospirosis control measures, preventive vaccination and treatment of infective humans that may curtail the disease transmission. For this, a mathematical model for the
Okosun Kazeem Oare   +2 more
doaj   +1 more source

The aggregation equation with power-law kernels: ill-posedness, mass concentration and similarity solutions

open access: yes, 2011
We study the multidimensional aggregation equation $u_t+\Div(uv)=0$, $v=-\nabla K*u$ with initial data in $\cP_2(\bR^d)\cap L_{p}(\bR^d)$. We prove that with biological relevant potential $K(x)=|x|$, the equation is ill-posed in the critical Lebesgue ...
Dong, Hongjie
core   +2 more sources

On a Cahn--Hilliard--Darcy system for tumour growth with solution dependent source terms

open access: yes, 2018
We study the existence of weak solutions to a mixture model for tumour growth that consists of a Cahn--Hilliard--Darcy system coupled with an elliptic reaction-diffusion equation.
A Hawkins-Daarud   +20 more
core   +1 more source

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