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Journal of Biological Dynamics

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https://www.readbyqxmd.com/read/28649945/how-noise-and-coupling-influence-leading-indicators-of-population-extinction-in-a-spatially-extended-ecological-system
#1
Suzanne M O'Regan
Anticipating critical transitions in spatially extended systems is a key topic of interest to ecologists. Gradually declining metapopulations are an important example of a spatially extended biological system that may exhibit a critical transition. Theory for spatially extended systems approaching extinction that accounts for environmental stochasticity and coupling is currently lacking. Here, we develop spatially implicit two-patch models with additive and multiplicative forms of environmental stochasticity that are slowly forced through population collapse, through changing environmental conditions...
June 25, 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28613986/modelling-and-optimal-control-of-pneumonia-disease-with-cost-effective-strategies
#2
Getachew Teshome Tilahun, Oluwole Daniel Makinde, David Malonza
We propose and analyse a nonlinear mathematical model for the transmission dynamics of pneumonia disease in a population of varying size. The deterministic compartmental model is studied using stability theory of differential equations. The effective reproduction number is obtained and also the asymptotic stability conditions for the disease free and as well as for the endemic equilibria are established. The possibility of bifurcation of the model and the sensitivity indices of the basic reproduction number to the key parameters are determined...
June 14, 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28770658/a-dynamical-model-of-the-transport-of-asbestos-fibres-in-the-human-body
#3
Alisa DeStefano, Clyde F Martin, Dorothy I Wallace
We present a model for the transport of a single type of asbestos fibre through the human body. The model captures the transport modes that pertain particularly to the lungs and the mesothelium. Numerical solutions of the system follow observed movement in the body. We compare the accumulation of fibres in the lungs versus the mesothelium, and then we give analysis and results for various cases of exposure level and exposure time. Models, such as the one developed here, can give clues as to how asbestos fibres impact the body, and where to look for major impact...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28653581/global-stability-of-the-coexistence-equilibrium-for-a-general-class-of-models-of-facultative-mutualism
#4
D Maxin, P Georgescu, L Sega, L Berec
Many models of mutualism have been proposed and studied individually. In this paper, we develop a general class of models of facultative mutualism that covers many of such published models. Using mild assumptions on the growth and self-limiting functions, we establish necessary and sufficient conditions on the boundedness of model solutions and prove the global stability of a unique coexistence equilibrium whenever it exists. These results allow for a greater flexibility in the way each mutualist species can be modelled and avoid the need to analyse any single model of mutualism in isolation...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28648137/control-strategies-and-sensitivity-analysis-of-anthroponotic-visceral-leishmaniasis-model
#5
Muhammad Zamir, Gul Zaman, Ali Saleh Alshomrani
This study proposes a mathematical model of Anthroponotic visceral leishmaniasis epidemic with saturated infection rate and recommends different control strategies to manage the spread of this disease in the community. To do this, first, a model formulation is presented to support these strategies, with quantifications of transmission and intervention parameters. To understand the nature of the initial transmission of the disease, the reproduction number [Formula: see text] is obtained by using the next-generation method...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28625106/deceptive-pollination-and-insects-learning-a-delicate-balance
#6
Virgilio Vázquez, Ignacio Barradas
In this paper we propose and discuss a simple two-dimensional model describing the interaction between two species: a plant population that gets pollinated by an insect population. The plants attract the insects deceiving them and not delivering any reward. We are interested in analysing the effect of learning by the insect population due to unsuccessfully visiting the deceiving plants. We are especially interested in three elements: conditions for the simultaneous coexistence of both species, their extinction as a function of the biological cost of the deceptiveness for the pollinator, and the appearance of oscillations in the dynamics...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28625104/modelling-the-effect-of-immigration-on-drinking-behaviour
#7
Hong Xiang, Cheng-Cheng Zhu, Hai-Feng Huo
A drinking model with immigration is constructed. For the model with problem drinking immigration, the model admits only one problem drinking equilibrium. For the model without problem drinking immigration, the model has two equilibria, one is problem drinking-free equilibrium and the other is problem drinking equilibrium. By employing the method of Lyapunov function, stability of all kinds of equilibria is obtained. Numerical simulations are also provided to illustrate our analytical results. Our results show that alcohol immigrants increase the difficulty of the temperance work of the region...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28537127/modelling-the-spatiotemporal-dynamics-of-chemovirotherapy-cancer-treatment
#8
Joseph Malinzi, Amina Eladdadi, Precious Sibanda
Chemovirotherapy is a combination therapy with chemotherapy and oncolytic viruses. It is gaining more interest and attracting more attention in the clinical setting due to its effective therapy and potential synergistic interactions against cancer. In this paper, we develop and analyse a mathematical model in the form of parabolic non-linear partial differential equations to investigate the spatiotemporal dynamics of tumour cells under chemovirotherapy treatment. The proposed model consists of uninfected and infected tumour cells, a free virus, and a chemotherapeutic drug...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28300490/stability-of-a-binge-drinking-model-with-delay
#9
Hai-Feng Huo, Yong-Lan Chen, Hong Xiang
A more realistic binge drinking model with time delay is introduced. Time delay is used to represent the time lag of the immunity against drinking in our model. For the model without the time delay, using Routh-Hurwitz criterion, we obtain that the alcohol-free equilibrium is locally asymptotically stable if [Formula: see text]. We also obtain that the unique alcohol-present equilibrium is locally asymptotically stable if [Formula: see text]. For the model with time delay, the local stability of all the equilibria is derived...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27874314/optimal-control-and-cost-effectiveness-analysis-for-newcastle-disease-eco-epidemiological-model-in-tanzania
#10
Alfred Hugo, Oluwole Daniel Makinde, Santosh Kumar, Fred F Chibwana
In this paper, a deterministic compartmental eco- epidemiological model with optimal control of Newcastle disease (ND) in Tanzania is proposed and analysed. Necessary conditions of optimal control problem were rigorously analysed using Pontryagin's maximum principle and the numerical values of model parameters were estimated using maximum likelihood estimator. Three control strategies were incorporated such as chicken vaccination (preventive), human education campaign and treatment of infected human (curative) and its' impact were graphically observed...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27852167/global-dynamics-and-bifurcation-analysis-of-a-host-parasitoid-model-with-strong-allee-effect
#11
Abdul Qadeer Khan, Jiying Ma, Dongmei Xiao
In this paper, we study the global dynamics and bifurcations of a two-dimensional discrete time host-parasitoid model with strong Allee effect. The existence of fixed points and their stability are analysed in all allowed parametric region. The bifurcation analysis shows that the model can undergo fold bifurcation and Neimark-Sacker bifurcation. As the parameters vary in a small neighbourhood of the Neimark-Sacker bifurcation condition, the unique positive fixed point changes its stability and an invariant closed circle bifurcates from the positive fixed point...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27852161/modelling-and-analysis-of-impulsive-releases-of-sterile-mosquitoes
#12
Mingzhan Huang, Xinyu Song, Jia Li
To study the impact of releasing sterile mosquitoes on mosquito-borne disease transmissions, we propose two mathematical models with impulsive releases of sterile mosquitoes. We consider periodic impulsive releases in the first model and obtain the existence, uniqueness, and globally stability of a wild-mosquito-eradication periodic solution. We also establish thresholds for the control of the wild mosquito population by selecting the release rate and the release period. In the second model, the impulsive releases are determined by the closely monitored wild mosquito density, or the state feedback...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27852159/the-transmission-dynamic-and-optimal-control-of-acute-and-chronic-hepatitis-b
#13
Tahir Khan, Gul Zaman, M Ikhlaq Chohan
In this article, we present the transmission dynamic of the acute and chronic hepatitis B epidemic problem and develop an optimal control strategy to control the spread of hepatitis B in a community. In order to do this, first we present the model formulation and find the basic reproduction number [Formula: see text]. We show that if [Formula: see text] then the disease-free equilibrium is both locally as well as globally asymptotically stable. Then, we prove that the model is locally and globally asymptotically stable, if [Formula: see text]...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27830588/stability-analysis-of-an-artificial-biomolecular-oscillator-with-non-cooperative-regulatory-interactions
#14
Christian Cuba Samaniego, Giulia Giordano, Franco Blanchini, Elisa Franco
Oscillators are essential to fuel autonomous behaviours in molecular systems. Artificial oscillators built with programmable biological molecules such as DNA and RNA are generally easy to build and tune, and can serve as timers for biological computation and regulation. We describe a new artificial nucleic acid biochemical reaction network, and we demonstrate its capacity to exhibit oscillatory solutions. This network can be built in vitro using nucleic acids and three bacteriophage enzymes, and has the potential to be implemented in cells...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27690755/steady-states-and-outbreaks-of-two-phase-nonlinear-age-structured-model-of-population-dynamics-with-discrete-time-delay
#15
Vitalii Akimenko, Roumen Anguelov
In this paper we study the nonlinear age-structured model of a polycyclic two-phase population dynamics including delayed effect of population density growth on the mortality. Both phases are modelled as a system of initial boundary values problem for semi-linear transport equation with delay and initial problem for nonlinear delay ODE. The obtained system is studied both theoretically and numerically. Three different regimes of population dynamics for asymptotically stable states of autonomous systems are obtained in numerical experiments for the different initial values of population density...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27642712/optimal-control-of-the-lotka-volterra-system-turnpike-property-and-numerical-simulations
#16
Aitziber Ibañez
The Lotka-Volterra model is a differential system of two coupled equations representing the interaction of two species: a prey one and a predator one. We formulate an optimal control problem adding the effect of hunting both species as the control variable. We analyse the optimal hunting problem paying special attention to the nature of the optimal state and control trajectories in long time intervals. To do that, we apply recent theoretical results on the frame to show that, when the time horizon is large enough, optimal strategies are nearly steady-state...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27629043/neuro-fuzzy-concepts-applied-for-planning-of-the-cereal-crops-applications-to-the-maize-hybrids-growing-in-a-romanian-region
#17
Alina Constantinescu
The aim of our study is to improve the crop planning procedures using neuro-fuzzy concepts. In this paper we design a neuro-fuzzy procedure that offers the suitable maize hybrid, from a set of preferred hybrids, which must be organically farmed in the current year. Our method is a statistical one, on the one hand it processes data provided by the previous years and on the other hand it takes in account the vague character of the environmental factors. Also we present here some experimental results obtained by us on a certain set of real data, results which prove the efficiency of our approach...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/27627694/global-hopf-bifurcation-analysis-of-an-susceptible-infective-removed-epidemic-model-incorporating-media-coverage-with-time-delay
#18
Huitao Zhao, Miaochan Zhao
An susceptible-infective-removed epidemic model incorporating media coverage with time delay is proposed. The stability of the disease-free equilibrium and endemic equilibrium is studied. And then, the conditions which guarantee the existence of local Hopf bifurcation are given. Furthermore, we show that the local Hopf bifurcation implies the global Hopf bifurcation after the second critical value of delay. The obtained results show that the time delay in media coverage can not affect the stability of the disease-free equilibrium when the basic reproduction number is less than unity...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28714355/editorial
#19
Lindi Wahl, Pei Yu, Xingfu Zou
No abstract text is available yet for this article.
August 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28492097/optimal-control-of-a-social-epidemic-model-with-media-coverage
#20
Hai-Feng Huo, Shui-Rong Huang, Xun-Yang Wang, Hong Xiang
A new social epidemic model to depict alcoholism with media coverage is proposed in this paper. Some fundamental properties of the model including existence and positivity as well as boundedness of equilibria are investigated. Stability of all equilibria are studied. The existence of the optimal control pair and mathematical expressions of optimal control are obtained by Pontryagin's maximum principle. Numerical simulations are also performed to illustrate our results. Our results show that media coverage is an effective measure to quit drinking...
May 11, 2017: Journal of Biological Dynamics
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