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Elaydi S, Lozi R. Global dynamics of discrete mathematical models of tuberculosis. J Biol Dyn 2024; 18:2323724. [PMID: 38493487 DOI: 10.1080/17513758.2024.2323724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 02/21/2024] [Indexed: 03/19/2024]
Abstract
In this paper, we develop discrete models of Tuberculosis (TB). This includes SEI endogenous and exogenous models without treatment. These models are then extended to a SEIT model with treatment. We develop two types of net reproduction numbers, one is the traditional R 0 which is based on the disease-free equilibrium, and a new net reproduction number R 0 ( E ∗ ) based on the endemic equilibrium. It is shown that the disease-free equilibrium is globally asymptotically stable if R 0 ≤ 1 and unstable if R 0 > 1 . Moreover, the endemic equilibrium is locally asymptotically stable if R 0 ( E ∗ ) < 1 < R 0 .
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Affiliation(s)
- Saber Elaydi
- Department of Mathematics, Trinity University, San Antonio, TX, USA
| | - René Lozi
- Department of Mathematics, Laboratory J.A. Dieudonné, CNRS, Université Côte d'Azur, France
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Beasley AE, Abdelouahab MS, Lozi R, Tsompanas MA, Powell AL, Adamatzky A. Mem-fractive properties of mushrooms. Bioinspir Biomim 2022; 16:066026. [PMID: 34624868 DOI: 10.1088/1748-3190/ac2e0c] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 10/08/2021] [Indexed: 06/13/2023]
Abstract
Memristors close the loop forI-Vcharacteristics of the traditional, passive, semi-conductor devices. A memristor is a physical realisation of the material implication and thus is a universal logical element. Memristors are getting particular interest in the field of bioelectronics. Electrical properties of living substrates are not binary and there is nearly a continuous transitions from being non-memristive to mem-fractive (exhibiting a combination of passive memory) to ideally memristive. In laboratory experiments we show that living oyster mushroomsPleurotus ostreatusexhibit mem-fractive properties. We offer a piece-wise polynomial approximation of theI-Vbehaviour of the oyster mushrooms. We also report spiking activity, oscillations in conduced current of the oyster mushrooms.
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Affiliation(s)
- Alexander E Beasley
- Unconventional Computing Laboratory, UWE, Bristol, United Kingdom
- Centre for Engineering Research, University of Hertfordshire, United Kingdom
| | - Mohammed-Salah Abdelouahab
- Laboratory of Mathematics and Their Interactions, University Centre Abdelhafid Boussouf, Mila 43000, Algeria
| | - René Lozi
- Université Côte d'Azur, CNRS, LJAD, Nice, France
| | | | - Anna L Powell
- Unconventional Computing Laboratory, UWE, Bristol, United Kingdom
| | - Andrew Adamatzky
- Unconventional Computing Laboratory, UWE, Bristol, United Kingdom
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Abdelouahab MS, Arama A, Lozi R. Bifurcation analysis of a model of tuberculosis epidemic with treatment of wider population suggesting a possible role in the seasonality of this disease. Chaos 2021; 31:123125. [PMID: 34972319 DOI: 10.1063/5.0057635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Accepted: 11/30/2021] [Indexed: 06/14/2023]
Abstract
In this paper, a novel epidemiological model describing the evolution of tuberculosis in a human population is proposed. This model is of the form SEIR, where S stands for Susceptible people, E for Exposed (infected but not yet infectious) people, I for Infectious people, and R for Recovered people. The main characteristic of this model inspired from the disease biology and some realistic hypothesis is that the treatment is administered not only to infectious but also to exposed people. Moreover, this model is characterized by an open structure, as it considers the transfer of infected or infectious people to other regions more conducive to their care and accepts treatment for exposed or infectious patients coming from other regions without care facilities. Stability and bifurcation of the solutions of this model are investigated. It is found that saddle-focus bifurcation occurs when the contact parameter β passes through some critical values. The model undergoes a Hopf bifurcation when the quality of treatment r is considered as a bifurcation parameter. It is shown also that the system exhibits saddle-node bifurcation, which is a transcritical bifurcation between equilibrium points. Numerical simulations are done to illustrate these theoretical results. Amazingly, the Hopf bifurcation suggests an unexpected and never suggested explanation of seasonality of such a disease, linked to the quality of treatment.
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Affiliation(s)
- M-S Abdelouahab
- Laboratory of Mathematics and Their Interactions, Abdelhafid Boussouf University Center, Mila 43000, Algeria
| | - A Arama
- School of Mathematics and Statistics, Central South University, Changsha, Hunan 410083, People's Republic of China
| | - R Lozi
- Université Côte d'Azur, CNRS, LJAD, Nice 06108, France
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Letellier C, Abraham R, Shepelyansky DL, Rössler OE, Holmes P, Lozi R, Glass L, Pikovsky A, Olsen LF, Tsuda I, Grebogi C, Parlitz U, Gilmore R, Pecora LM, Carroll TL. Some elements for a history of the dynamical systems theory. Chaos 2021; 31:053110. [PMID: 34240941 DOI: 10.1063/5.0047851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 04/08/2021] [Indexed: 06/13/2023]
Abstract
Writing a history of a scientific theory is always difficult because it requires to focus on some key contributors and to "reconstruct" some supposed influences. In the 1970s, a new way of performing science under the name "chaos" emerged, combining the mathematics from the nonlinear dynamical systems theory and numerical simulations. To provide a direct testimony of how contributors can be influenced by other scientists or works, we here collected some writings about the early times of a few contributors to chaos theory. The purpose is to exhibit the diversity in the paths and to bring some elements-which were never published-illustrating the atmosphere of this period. Some peculiarities of chaos theory are also discussed.
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Affiliation(s)
- Christophe Letellier
- CORIA, Normandie Université, Campus Universitaire du Madrillet, F-76800 Saint-Etienne du Rouvray, France
| | - Ralph Abraham
- Mathematics Department, University of California, Santa Cruz, Santa Cruz, California 95064, USA
| | - Dima L Shepelyansky
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Otto E Rössler
- Faculty of Science, University of Tübingen, D-72076 Tübingen, Germany
| | - Philip Holmes
- Department of Mechanical and Aerospace Engineering and Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ 08544, USA
| | - René Lozi
- Université Côte d'Azur, CNRS, Laboratoire Jean Alexandre Dieudonné, F-06108 Nice, France
| | - Leon Glass
- Department of Physiology, McGill University, 3655 Promenade Sir William Osler, Montreal, Quebec H3G 1Y6, Canada
| | - Arkady Pikovsky
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam-Golm, Germany
| | - Lars F Olsen
- Institute of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Ichiro Tsuda
- Center of Mathematics for Artificial Intelligence and Data Science, Chubu University Academy of Emerging Sciences, Matsumoto-cho 1200, Kasugai, Aichi 487-8501, Japan
| | - Celso Grebogi
- Institute for Complex Systems and Mathematical Biology, King's College, University of Aberdeen, Aberdeen AB24 3UE, Scotland
| | - Ulrich Parlitz
- Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany and Institute for the Dynamics of Complex Systems, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
| | - Robert Gilmore
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - Louis M Pecora
- Code 6392, U.S. Naval Research Laboratory, Washington, DC 20375, USA
| | - Thomas L Carroll
- Code 6392, U.S. Naval Research Laboratory, Washington, DC 20375, USA
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Wang D, Bosch W, kirsch D, Lozi R, Naqa I, Roberge D, Finkelstein S, Petersen I, Saito N, DeLaney T. Variations in the Gross Target Volume and Clinical Target Volume Evaluated by RTOG Sarcoma Radiation Oncologists for Preoperative Radiotherapy of Primary Extremity Sarcoma. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.1442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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