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Acta Biotheoretica

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https://www.readbyqxmd.com/read/28342137/skewed-exposure-to-environmental-antigens-complements-hygiene-hypothesis-in-explaining-the-rise-of-allergy
#1
Wilfried Allaerts, Tse Wen Chang
The Hygiene Hypothesis has been recognized as an important cornerstone to explain the sudden increase in the prevalence of asthma and allergic diseases in modernized culture. The recent epidemic of allergic diseases is in contrast with the gradual implementation of Homo sapiens sapiens to the present-day forms of civilization. This civilization forms a gradual process with cumulative effects on the human immune system, which co-developed with parasitic and commensal Helminths. The clinical manifestation of this epidemic, however, became only visible in the second half of the twentieth century...
March 24, 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/28324189/stability-of-a-stochastic-model-of-an-sir-epidemic-with-vaccination
#2
P J Witbooi
We prove almost sure exponential stability for the disease-free equilibrium of a stochastic differential equations model of an SIR epidemic with vaccination. The model allows for vertical transmission. The stochastic perturbation is associated with the force of infection and is such that the total population size remains constant in time. We prove almost sure positivity of solutions. The main result concerns especially the smaller values of the diffusion parameter, and describes the stability in terms of an analogue [Formula: see text] of the basic reproduction number [Formula: see text] of the underlying deterministic model, with [Formula: see text]...
March 21, 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/28315023/external-noise-and-external-signal-induced-transition-of-gene-switch-and-coherence-resonance-in-the-genetic-regulatory-system
#3
Jian-Cheng Shi, Min Luo, Tao Dong, Chu-Sheng Huang
The transition of gene switch induced by external noises (multiplicative external noise and additive external noise) and external signals is investigated in the genetic regulatory system. Results show that the state-to-state transition of gene switch as well as resonant behaviors, such as the explicit coherence resonance (ECR), implicit coherence resonance (ICR) and control parameter coherence biresonance (CPCBR), can appear when noises are injected into the genetic regulatory system. The ECR is increased with the increase of the control parameter value when starting from the supercritical Hopf bifurcation parameter point, and there exists a critical control parameter value for the occurrence of ECR...
March 17, 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/28197858/mapping-biological-transmission-an-empirical-dynamical-and-evolutionary-approach
#4
Francesca Merlin, Livio Riboli-Sasco
The current debate over extending inheritance and its evolutionary impact has focused on adding new categories of non-genetic factors to the classical transmission of DNA, and on trying to redefine inheritance. Transmitted factors have been mainly characterized by their directions of transmission (vertical, horizontal, or both) and the way they store variations. In this paper, we leave aside the issue of defining inheritance. We rather try to build an evolutionary conceptual framework that allows for tracing most, if not all forms of transmission and makes sense of their different tempos and modes...
February 14, 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/28168357/erratum-to-exploring-darwinian-worlds-from-darwin-to-the-extended-synthesis-essay-review-of-t-heams-p-huneman-g-lecointre-and-m-silberstein-eds-handbook-of-evolutionary-thinking-in-the-sciences-springer-dordrecht-2015-910%C3%A2-pp-349-00-isbn-978-94-017-9014-7
#5
https://www.readbyqxmd.com/read/28044218/dual-causality-and-the-autonomy-of-biology
#6
Walter J Bock
Ernst Mayr's concept of dual causality in biology with the two forms of causes (proximate and ultimate) continues to provide an essential foundation for the philosophy of biology. They are equivalent to functional (=proximate) and evolutionary (=ultimate) causes with both required for full biological explanations. The natural sciences can be classified into nomological, historical nomological and historical dual causality, the last including only biology. Because evolutionary causality is unique to biology and must be included for all complete biological explanations, biology is autonomous from the physical sciences...
March 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/27990591/on-the-role-of-imitation-on-adolescence-methamphetamine-abuse-dynamics
#7
J Mushanyu, F Nyabadza, G Muchatibaya, A G R Stewart
Adolescence methamphetamine use is an issue of considerable concern due to its correlation with later delinquency, divorce, unemployment and health problems. Understanding how adolescents initiate methamphetamine abuse is important in developing effective prevention programs. We formulate a mathematical model for the spread of methamphetamine abuse using nonlinear ordinary differential equations. It is assumed that susceptibles are recruited into methamphetamine use through imitation. An epidemic threshold value, [Formula: see text], termed the abuse reproduction number, is proposed and defined herein in the drug-using context...
March 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/27535677/smt-and-toft-integrable-after-all-a-reply-to-bizzarri-and-cucina
#8
Baptiste Bedessem, Stphanie Ruphy
In a previous paper recently published in this journal, we argue that the two main theories of carcinogenesis (SMT and TOFT) should be considered as compatible, at the metaphysical, epistemological and biological levels. In a reply to our contribution, Bizzarri and Cucina claim we are wrong since SMT and TOFT are opposite and incompatible paradigms. Here, we show that their arguments are not satisfactory. Indeed, the authors go through the same mistakes that we already addressed. In particular, they confuse reductionism, as an ontological frame, and genetic determinism, as a causal pathway...
March 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/27515276/the-role-of-hyalomma-truncatum-on-the-dynamics-of-rift-valley-fever-insights-from-a-mathematical-epidemic-model
#9
Sansao A Pedro, Shirley Abelman, Henri E Z Tonnang
To date, our knowledge of Rift Valley fever (RVF) disease spread and maintenance is still limited, as flooding, humid weather and presence of biting insects such as mosquitoes, have not completely explained RVF outbreaks. We propose a model that includes livestock, mosquitoes and ticks compartments structured according to their questing and feeding behaviour in order to study the possible role of ticks on the dynamics of RVF. To quantify disease transmission at the initial stage of the epidemic, we derive an explicit formula of the basic reproductive number, [Formula: see text]...
March 2017: Acta Biotheoretica
https://www.readbyqxmd.com/read/27853896/discrete-mesh-approach-in-morphogenesis-modelling-the-example-of-gastrulation
#10
J Demongeot, A Lontos, E Promayon
Morphogenesis is a general concept in biology including all the processes which generate tissue shapes and cellular organizations in a living organism. Many hybrid formalizations (i.e., with both discrete and continuous parts) have been proposed for modelling morphogenesis in embryonic or adult animals, like gastrulation. We propose first to study the ventral furrow invagination as the initial step of gastrulation, early stage of embryogenesis. We focus on the study of the connection between the apical constriction of the ventral cells and the initiation of the invagination...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27837289/wound-healing-and-scale-modelling-in-zebrafish
#11
F Caraguel, N Bessonov, J Demongeot, D Dhouailly, V Volpert
We propose to study the wound healing in Zebrafish by using firstly a differential approach for modelling morphogens diffusion and cell chemotactic motion, and secondly a hybrid model of tissue regeneration, where cells are considered as individual objects and molecular concentrations are described by partial differential equations.
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27785584/interactions-between-the-cross-shore-structure-of-small-pelagic-fish-population-offshore-industrial-fisheries-and-near-shore-artisanal-fisheries-a-mathematical-approach
#12
Rachid Mchich, Timothée Brochier, Pierre Auger, Patrice Brehmer
This work presents a mathematical model describing the interactions between the cross-shore structure of small pelagic fish population an their exploitation by coastal and offshore fisheries. The complete model is a system of seven ODE's governing three stocks of small pelagic fish population moving and growing between three zones. Two types of fishing fleets are inter-acting with the fish population, industrial boats, constrained to offshore area, and artisanal boats, operating from the shore. Two time scales were considered and we use aggregation methods that allow us to reduce the dimension of the model and to obtain an aggregated model, which is a four dimension one...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27770318/preface
#13
EDITORIAL
Hermine Biermé, Jean-Pierre Françoise, Rémy Guillevin, Alain Miranville
No abstract text is available yet for this article.
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27770317/basin-of-attraction-of-solutions-with-pattern-formation-in-slow-fast-reaction-diffusion-systems
#14
B Ambrosio, M A Aziz-Alaoui
This article is devoted to the characterization of the basin of attraction of pattern solutions for some slow-fast reaction-diffusion systems with a symmetric property and an underlying oscillatory reaction part. We characterize some subsets of initial conditions that prevent the dynamical system to evolve asymptotically toward solutions which are homogeneous in space. We also perform numerical simulations that illustrate theoretical results and give rise to symmetric and non-symmetric pattern solutions. We obtain these last solutions by choosing particular random initial conditions...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27770316/can-fishing-pressure-invert-the-outcome-of-interspecific-competition-the-case-of-the-thiof-and-of-the-octopus-along-the-senegalese-coast
#15
Thuy Nguyen-Phuong, Doanh Nguyen-Ngoc, Pierre Auger, Sidy Ly, Didier Jouffre
We present a mathematical model of two competing marine species that are harvested. We consider three models according to different levels of complexity, without and with species refuge and density-independent and density-dependent species movement between fishing area and refuge. We particularly study the effects of the fishing pressure on the outcome of the competition. We focus on conditions that allow an inferior competitor to invade as a result of fishing pressure. The model is discussed in relationship to the case of the thiof and the octopus along the Atlantic West African coast...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27770315/effects-of-behavioural-strategy-on-the-exploitative-competition-dynamics
#16
Doanh Nguyen-Ngoc, Thuy Nguyen-Phuong
We investigate a system of two species exploiting a common resource. We consider both abiotic (i.e. with a constant resource supply rate) and biotic (i.e. with resource reproduction and self-limitation) resources. We are interested in the asymmetric competition where a given consumer is the locally superior resource exploiter (LSE) and the other is the locally inferior resource exploiter (LIE). They also interact directly via interference competition in the sense that LIE individuals can use two opposite strategies to compete with LSE individuals: we assume, in the first case, that LIE uses an avoiding strategy, i...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27761675/a-greedy-algorithm-for-brain-mri-s-registration
#17
Clément Chesseboeuf
This document presents a non-rigid registration algorithm for the use of brain magnetic resonance (MR) images comparison. More precisely, we want to compare pre-operative and post-operative MR images in order to assess the deformation due to a surgical removal. The proposed algorithm has been studied in Chesseboeuf et al. ((Non-rigid registration of magnetic resonance imaging of brain. IEEE, 385-390. doi: 10.1109/IPTA.2015.7367172 , 2015), following ideas of Trouvé (An infinite dimensional group approach for physics based models in patterns recognition...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27757742/recursive-model-identification-for-the-evaluation-of-baroreflex-sensitivity
#18
Virginie Le Rolle, Alain Beuchée, Jean-Paul Praud, Nathalie Samson, Patrick Pladys, Alfredo I Hernández
A method for the recursive identification of physiological models of the cardiovascular baroreflex is proposed and applied to the time-varying analysis of vagal and sympathetic activities. The proposed method was evaluated with data from five newborn lambs, which were acquired during injection of vasodilator and vasoconstrictors and the results show a close match between experimental and simulated signals. The model-based estimation of vagal and sympathetic contributions were consistent with physiological knowledge and the obtained estimators of vagal and sympathetic activities were compared to traditional markers associated with baroreflex sensitivity...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27738842/a-mathematical-model-for-alternation-of-polygamy-and-parthenogenesis-stability-versus-efficiency-and-analogy-with-parasitism
#19
COMPARATIVE STUDY
Evariste Sanchez-Palencia, Philippe Lherminier, Jean-Pierre Françoise
The present work is a contribution to the understanding of the sempiternal problem of the "burden of factor two" implied by sexual reproduction versus asexual one, as males are energy consumers not contributing to the production of offspring. We construct a deterministic mathematical model in population dynamics where a species enjoys both sexual and parthenogenetic capabilities of reproduction and lives on a limited resource. We then show how polygamy implies instability of a parthenogenetic population with a small number of sexually born males...
December 2016: Acta Biotheoretica
https://www.readbyqxmd.com/read/27718031/influence-of-antithrombin-on-the-regimes-of-blood-coagulation-insights-from-the-mathematical-model
#20
Anass Bouchnita, Tatiana Galochkina, Vitaly Volpert
Blood coagulation is regulated through a complex network of biochemical reactions of blood factors. The main acting enzyme is thrombin whose propagation in blood plasma leads to fibrin clot formation. Spontaneous clot formation is normally controlled through the action of different plasma inhibitors, in particular, through the thrombin binding by antithrombin. In the current study we develop a mathematical model of clot formation both in quiescent plasma and in blood flow and determine the analytical conditions on the antithrombin concentration corresponding to different regimes of blood coagulation...
December 2016: Acta Biotheoretica
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