1
|
Chai Z, Wang Y, Li YM, Zhao ZG, Chen M. Correlations between geomagnetic field and global occurrence of cardiovascular diseases: evidence from 204 territories in different latitude. BMC Public Health 2023; 23:1771. [PMID: 37697364 PMCID: PMC10496193 DOI: 10.1186/s12889-023-16698-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/04/2023] [Indexed: 09/13/2023] Open
Abstract
BACKGROUND The correlation between stable geomagnetic fields and unstable geomagnetic activities with mortality, incidence, and prevalence of cardiovascular diseases (CVDs) remains ambiguous. METHOD To investigate the correlations between geomagnetic field (GMF) intensity and geomagnetic disturbance (GMD) and CVDs events in global, long-period scale, global and 204 countries and territories were included on the base of 2019 Global Burden of Disease study (GBD 2019). Data of GMF intensity, GMD frequency, CVDs events, weather and health economic indicators from 1996 to 2019 of included locations were collected. Linear regression and panel data modelling were conducted to identify the correlations between GMF intensity and CVDs events, multi-factor panel data analysis was also generated to adjust the effect of confounding factors. RESULTS For the average data during 1996-2019, linear regression model revealed consistent positive correlations between total GMF (tGMF) intensity and mortality of total CVDs [coef = 0.009, (0.006,0.011 95%CI)], whereas negative correlations were found between horizonal GMF (hGMF) intensity and total CVD mortality [coef = -0.010 (-0.013, -0.007 95%CI)]. When considering the time trend, panel data analysis still demonstrated positive correlation between tGMF and total CVDs mortality [coef = 0.009, (0.008,0.009 95%CI)]. Concurrently, the hGMF negatively correlated with total CVDs mortality [coef = -0.008, (-0.009, -0.007 95%CI)]. When the panel models were adjusted for confounding factors, no reverse of correlation tendency was found between tGMF, hGMF and CVDs events. In high-income territories, positive correlation was found between geomagnetic storm (GMS) frequency and mortality of total CVDs [coef = 14.007,(2.785, 25.229 95%CI)], however, this positive trend faded away gradually with the latitude decreasing from polar to equator. CONCLUSIONS Stable and long-term horizontal component of GMF may be beneficial to cardiac health. Unstable and short-term GMF called GMD could be a hazard to cardiac health. Our results suggest the importance of regular GMF in maintaining cardio-health state and the adverse impacts of GMD on cardiac health.
Collapse
Affiliation(s)
- Zheng Chai
- Laboratory of Heart Valve Disease and Department of Cardiology, West China Hospital, Sichuan University, No. 37 GuoXue Alley, Chengdu, Sichuan, 610041, P.R. China
| | - Yan Wang
- Laboratory of Heart Valve Disease and Department of Cardiology, West China Hospital, Sichuan University, No. 37 GuoXue Alley, Chengdu, Sichuan, 610041, P.R. China
| | - Yi-Ming Li
- Laboratory of Heart Valve Disease and Department of Cardiology, West China Hospital, Sichuan University, No. 37 GuoXue Alley, Chengdu, Sichuan, 610041, P.R. China
| | - Zhen-Gang Zhao
- Laboratory of Heart Valve Disease and Department of Cardiology, West China Hospital, Sichuan University, No. 37 GuoXue Alley, Chengdu, Sichuan, 610041, P.R. China
| | - Mao Chen
- Laboratory of Heart Valve Disease and Department of Cardiology, West China Hospital, Sichuan University, No. 37 GuoXue Alley, Chengdu, Sichuan, 610041, P.R. China.
| |
Collapse
|
2
|
Liebert A, Capon W, Pang V, Vila D, Bicknell B, McLachlan C, Kiat H. Photophysical Mechanisms of Photobiomodulation Therapy as Precision Medicine. Biomedicines 2023; 11:biomedicines11020237. [PMID: 36830774 PMCID: PMC9953702 DOI: 10.3390/biomedicines11020237] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 01/11/2023] [Accepted: 01/12/2023] [Indexed: 01/19/2023] Open
Abstract
Despite a significant focus on the photochemical and photoelectrical mechanisms underlying photobiomodulation (PBM), its complex functions are yet to be fully elucidated. To date, there has been limited attention to the photophysical aspects of PBM. One effect of photobiomodulation relates to the non-visual phototransduction pathway, which involves mechanotransduction and modulation to cytoskeletal structures, biophotonic signaling, and micro-oscillatory cellular interactions. Herein, we propose a number of mechanisms of PBM that do not depend on cytochrome c oxidase. These include the photophysical aspects of PBM and the interactions with biophotons and mechanotransductive processes. These hypotheses are contingent on the effect of light on ion channels and the cytoskeleton, the production of biophotons, and the properties of light and biological molecules. Specifically, the processes we review are supported by the resonant recognition model (RRM). This previous research demonstrated that protein micro-oscillations act as a signature of their function that can be activated by resonant wavelengths of light. We extend this work by exploring the local oscillatory interactions of proteins and light because they may affect global body circuits and could explain the observed effect of PBM on neuro-cortical electroencephalogram (EEG) oscillations. In particular, since dysrhythmic gamma oscillations are associated with neurodegenerative diseases and pain syndromes, including migraine with aura and fibromyalgia, we suggest that transcranial PBM should target diseases where patients are affected by impaired neural oscillations and aberrant brain wave patterns. This review also highlights examples of disorders potentially treatable with precise wavelengths of light by mimicking protein activity in other tissues, such as the liver, with, for example, Crigler-Najjar syndrome and conditions involving the dysregulation of the cytoskeleton. PBM as a novel therapeutic modality may thus behave as "precision medicine" for the treatment of various neurological diseases and other morbidities. The perspectives presented herein offer a new understanding of the photophysical effects of PBM, which is important when considering the relevance of PBM therapy (PBMt) in clinical applications, including the treatment of diseases and the optimization of health outcomes and performance.
Collapse
Affiliation(s)
- Ann Liebert
- Faculty of Medicine and Health, University of Sydney, Sydney 2006, Australia
- Adventist Hospital Group, Wahroonga 2076, Australia
- NICM Health Research Institute, Western Sydney University, Westmead 2145, Australia
- Correspondence:
| | - William Capon
- Faculty of Medicine and Health, University of Sydney, Sydney 2006, Australia
| | - Vincent Pang
- NICM Health Research Institute, Western Sydney University, Westmead 2145, Australia
| | - Damien Vila
- Faculty of Medicine of Montpellier-Nîmes, University of Montpellier, 34090 Montpellier, France
| | - Brian Bicknell
- NICM Health Research Institute, Western Sydney University, Westmead 2145, Australia
| | - Craig McLachlan
- Faculty of Health, Torrens University, Adelaide 5000, Australia
| | - Hosen Kiat
- NICM Health Research Institute, Western Sydney University, Westmead 2145, Australia
- Faculty of Health, Torrens University, Adelaide 5000, Australia
- Cardiac Health Institute, Sydney 2121, Australia
- ANU College of Health and Medicine, Australian National University, Canberra 2600, Australia
- Faculty of Medicine, Health and Human Sciences, Macquarie University, Macquarie Park 2109, Australia
| |
Collapse
|
3
|
Xu Q, Ju Z, Ding S, Feng C, Chen M, Bao B. Electromagnetic induction effects on electrical activity within a memristive Wilson neuron model. Cogn Neurodyn 2022; 16:1221-1231. [PMID: 36237413 PMCID: PMC9508304 DOI: 10.1007/s11571-021-09764-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 10/11/2021] [Accepted: 11/22/2021] [Indexed: 01/12/2023] Open
Abstract
Neurons can exhibit abundant electrical activities due to physical effects of various electrophysiology environments. The electromagnetic induction flows can be triggered by changes in neuron membrane potential, which can be equivalent to a memristor applying on membrane potential. To imitate the electromagnetic induction effects, we propose a three-variable memristor-based Wilson neuron model. Using several kinetic analysis methods, the memristor parameter- and initial condition-related electrical activities are explored intensively. It is revealed that the memristive Wilson neuron model can display rich electrical activities, including the asymmetric coexisting electrical activities and antimonotonicity phenomenon. Finally, using off-the-shelf discrete components, an analog circuit on a hardware level is implemented to verify the numerically simulated coexisting electrical activities. Studying these rich electrical activities in neurons can build the groundwork to widen the neuron-based engineering applications.
Collapse
Affiliation(s)
- Quan Xu
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| | - Zhutao Ju
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| | - Shoukui Ding
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| | - Chengtao Feng
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| | - Mo Chen
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| | - Bocheng Bao
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164 People’s Republic of China
| |
Collapse
|
4
|
Memristive FHN Spiking Neuron Model and Brain-Inspired Threshold Logic Computing. Neurocomputing 2022. [DOI: 10.1016/j.neucom.2022.08.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
5
|
Elyukhina IV. Ginzburg–Landau Equation for Nonlinear Instability Analysis in Cardiac Tissue. Biophysics (Nagoya-shi) 2022. [DOI: 10.1134/s000635092202004x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
6
|
Ntahkie Takembo C, Kofane TC. Controlling discharge mode in electrical activities of myocardial cell using mixed frequencies magnetic radiation. Heliyon 2022; 8:e09084. [PMID: 35309399 PMCID: PMC8924321 DOI: 10.1016/j.heliyon.2022.e09084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/27/2021] [Accepted: 03/07/2022] [Indexed: 12/23/2022] Open
Affiliation(s)
- Clovis Ntahkie Takembo
- Department of Electrical and Electronic Engineering, College of Technology, University of Buea I, P.O. Box 63, Buea, Cameroon
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
- Corresponding author at: Department of Electrical and Electronic Engineering, College of Technology, University of Buea I, P.O. Box 63, Buea, Cameroon.
| | - Timoleon Crepin Kofane
- Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaounde I, P.O. Box 812, Yaounde, Cameroon
| |
Collapse
|
7
|
Numan A, Singh S, Zhan Y, Li L, Khalid M, Rilla K, Ranjan S, Cinti S. Advanced nanoengineered-customized point-of-care tools for prostate-specific antigen. Mikrochim Acta 2021; 189:27. [PMID: 34905090 DOI: 10.1007/s00604-021-05127-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 12/02/2021] [Indexed: 01/06/2023]
Abstract
Change in the level of human prostate-specific antigen (PSA) is a major element in the development and progression of prostate cancer (PCa). Most of the methodologies are currently restricted to their application in routine clinical screening due to the scarcity of adequate screening tools, false reading, long assay time, and cost. Innovative techniques and the integration of knowledge from a variety of domains, such as materials science and engineering, are needed to provide sustainable solutions. The convergence of precision point-of-care (POC) diagnostic techniques, which allow patients to respond in real time to changes in PSA levels, provides promising possibilities for quantitative and quantitative detection of PSA. This solution could be interesting and relevant for use in PCa diagnosis at the POC. The approaches enable low-cost real-time detection and are simple to integrate into user-friendly sensor devices. This review focuses on the investigations, prospects, and challenges associated with integrating engineering sciences with cancer biology to develop nanotechnology-based tools for PCa diagnosis. This article intends to encourage the development of new nanomaterials to construct high-performance POC devices for PCa detection. Finally, the review concludes with closing remarks and a perspective forecast.
Collapse
Affiliation(s)
- Arshid Numan
- Graphene & Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500, Petaling Jaya, Selangor, Malaysia
| | - Sima Singh
- IES Institute of Pharmacy, IES University Campus, Kalkheda, Ratibad Main Road, Bhopal, 462044, Madhya Pradesh, India.,Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, 80131, Naples, Italy
| | - Yiqiang Zhan
- State Key Laboratory of ASIC and System, SIST, Fudan University, Shanghai, 200433, China
| | - Lijie Li
- College of Engineering, Swansea University, Swansea, SA1 8EN, UK
| | - Mohammad Khalid
- Graphene & Advanced 2D Materials Research Group (GAMRG), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500, Petaling Jaya, Selangor, Malaysia
| | - Kirsi Rilla
- Institute of Biomedicine, University of Eastern Finland, P.O.Box 1627, 70211, Kuopio, Finland
| | - Sanjeev Ranjan
- Institute of Biomedicine, University of Eastern Finland, P.O.Box 1627, 70211, Kuopio, Finland
| | - Stefano Cinti
- Department of Pharmacy, University of Naples "Federico II", Via D. Montesano 49, 80131, Naples, Italy. .,BAT Center - Interuniversity Center for Studies on Bioinspired Agro-Environmental Technology, University of Napoli Federico II, 80055, Naples, Italy.
| |
Collapse
|
8
|
Rajagopal K, He S, Karthikeyan A, Duraisamy P. Size matters: Effects of the size of heterogeneity on the wave re-entry and spiral wave formation in an excitable media. CHAOS (WOODBURY, N.Y.) 2021; 31:053131. [PMID: 34240920 DOI: 10.1063/5.0051010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 05/04/2021] [Indexed: 06/13/2023]
Abstract
Network performance of neurons plays a vital role in determining the behavior of many physiological systems. In this paper, we discuss the wave propagation phenomenon in a network of neurons considering obstacles in the network. Numerous studies have shown the disastrous effects caused by the heterogeneity induced by the obstacles, but these studies have been mainly discussing the orientation effects. Hence, we are interested in investigating the effects of both the size and orientation of the obstacles in the wave re-entry and spiral wave formation in the network. For this analysis, we have considered two types of neuron models and a pancreatic beta cell model. In the first neuron model, we use the well-known differential equation-based neuron models, and in the second type, we used the hybrid neuron models with the resetting phenomenon. We have shown that the size of the obstacle decides the spiral wave formation in the network and horizontally placed obstacles will have a lesser impact on the wave re-entry than the vertically placed obstacles.
Collapse
Affiliation(s)
- Karthikeyan Rajagopal
- Center for Nonlinear Systems, Chennai Institute of Technology, Chennai, Tamil Nadu 600069, India
| | - Shaobo He
- School of Physics and Electronics, Central South University, Changsha 410083, China
| | - Anitha Karthikeyan
- Department of Electronics and Communication Engineering, Prathyusha Engineering College, Thiruvallur, Tamil Nadu 602025, India
| | - Prakash Duraisamy
- Center for Nonlinear Systems, Chennai Institute of Technology, Chennai, Tamil Nadu 600069, India
| |
Collapse
|
9
|
|
10
|
Zhu R, Liu J, Wang J, Han W, Shen Z, Muraina TO, Chen J, Sun D. Comparison of soil microbial community between reseeding grassland and natural grassland in Songnen Meadow. Sci Rep 2020; 10:16884. [PMID: 33037306 PMCID: PMC7547709 DOI: 10.1038/s41598-020-74023-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 09/18/2020] [Indexed: 11/23/2022] Open
Abstract
Microorganisms have important ecological functions in ecosystems. Reseeding is considered as one of the main strategies for preventing grassland degradation in China. However, the response of soil microbial community and diversity to reseeding grassland (RG) and natural grassland (NG) remains unclear, especially in the Songnen Meadow. In this study, the soil microbial community compositions of two vegetation restoration types (RG vs NG) were analyzed using a high-throughput sequencing technique. A total of 23,142 microbial OTUs were detected, phylogenetically derived from 11 known bacterial phyla. Soil advantage categories included Proteobacteria, Acidobacteria, Actinobacteria, and Bacteroidetes, which together accounted for > 78% of the all phyla in vegetation restoration. The soil microbial diversity was higher in RG than in NG. Two types of vegetation restoration had significantly different characteristics of soil microbial community (P < 0.001). Based on a molecular ecological network analysis, we found that the network in RG had a longer average path distance and modularity than in NG network, making it more resilient to environment changes. Meanwhile, the results of the canonical correspondence analysis and molecular ecological network analysis showed that soil pH (6.34 ± 0.35 in RG and 7.26 ± 0.28 in NG) was the main factor affecting soil microbial community structure, followed by soil moisture (SM) in the Songnen meadow, China. Besides, soil microbial community characteristics can vary significantly in different vegetation restoration. Thus, we suggested that it was necessary and reasonable for this area to popularize reseeding grassland in the future.
Collapse
Affiliation(s)
- Ruifen Zhu
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China
| | - Jielin Liu
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China
| | - Jianli Wang
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China
| | - Weibo Han
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China
| | - Zhongbao Shen
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China
| | - Taofeek O Muraina
- National Hulunber Grassland Ecosystem Observation and Research Station, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 10008, China
- Department of Animal Health and Production, Oyo State College of Agriculture and Technology, P.M.B. 10, Igbo-Ora, Oyo State, Nigeria
| | - Jishan Chen
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China.
| | - Dequan Sun
- Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, 368 Xue Fu Road, Nangang District, Harbin, 150086, China.
| |
Collapse
|
11
|
Takembo CN, Fouda HPE. Effect of temperature fluctuation on the localized pattern of action potential in cardiac tissue. Sci Rep 2020; 10:15087. [PMID: 32934327 PMCID: PMC7493951 DOI: 10.1038/s41598-020-72188-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 08/17/2020] [Indexed: 02/02/2023] Open
Abstract
Based on the improved FitzHugh-Nagumo myocardial model driven by a constant external current, the effect of temperature fluctuation in a network of electrically coupled myocardial cells are investigated through analytical and numerical computations. Through the technique of multiple scale expansion, we successfully reduced the complex nonlinear system of equations to a more tractable and solvable nonlinear amplitude equation on which the analysis of linear stability is performed. Interestingly from this analysis, a plot of critical amplitude of action potential versus wave number revealed the growth rate of modulational instability (MI) is an increasing function of the thermoelectric couplings; [Formula: see text] and [Formula: see text], under fixed conditions of nonlinear electrical couplings. In order to verify our analytical predictions through the study the long-time evolution of the modulated cardiac impulses, numerical computation is finally carried out. Numerical experiment revealed the existence of localized coherent structures with some recognized features of synchronization. Through the mechanism of MI, changes in thermoelectrical couplings promote wave localization and mode transition in electrical activities in the cell lattice. Results could provide new insights in understanding the underlying mechanism of the manifestation of sudden heart disorder subjected to heavily temperature fluctuation.
Collapse
Affiliation(s)
- Clovis Ntahkie Takembo
- Department of Electrical and Electronic Engineering, College of Technology, University of Buéa, P.O. Box 63, Buéa, Cameroon.
| | - Henri Paul Ekobena Fouda
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| |
Collapse
|
12
|
Bao H, Hu A, Liu W, Bao B. Hidden Bursting Firings and Bifurcation Mechanisms in Memristive Neuron Model With Threshold Electromagnetic Induction. IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS 2020; 31:502-511. [PMID: 30990198 DOI: 10.1109/tnnls.2019.2905137] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Memristors can be employed to mimic biological neural synapses or to describe electromagnetic induction effects. To exhibit the threshold effect of electromagnetic induction, this paper presents a threshold flux-controlled memristor and examines its frequency-dependent pinched hysteresis loops. Using an electromagnetic induction current generated by the threshold memristor to replace the external current in 2-D Hindmarsh-Rose (HR) neuron model, a 3-D memristive HR (mHR) neuron model with global hidden oscillations is established and the corresponding numerical simulations are performed. It is found that due to no equilibrium point, the obtained mHR neuron model always operates in hidden bursting firing patterns, including coexisting hidden bursting firing patterns with bistability also. In addition, the model exhibits complex dynamics of the actual neuron electrical activities, which acts like the 3-D HR neuron model, indicating its feasibility. In particular, by constructing the fold and Hopf bifurcation sets of the fast-scale subsystem, the bifurcation mechanisms of hidden bursting firings are expounded. Finally, circuit experiments on hardware breadboards are deployed and the captured results well match with the numerical results, validating the physical mechanism of biological neuron and the reliability of electronic neuron.
Collapse
|
13
|
Tankou Tagne AS, Takembo CN, Ben-Bolie HG, Owona Ateba P. Localized nonlinear excitations in diffusive memristor-based neuronal networks. PLoS One 2019; 14:e0214989. [PMID: 31163037 PMCID: PMC6548494 DOI: 10.1371/journal.pone.0214989] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Accepted: 03/25/2019] [Indexed: 12/02/2022] Open
Abstract
We extend the existing ordinary differential equations modeling neural electrical activity to include the memory effect of electromagnetic induction through magnetic flux, used to describe time varying electromagnetic field. Through the multi-scale expansion in the semi-discrete approximation, we show that the neural network dynamical equations can be governed by the complex Ginzburg-Landau equation. The analytical and numerical envelop soliton of this equation are reported. The results obtained suggest the possibility of collective information processing and sharing in the nervous system, operating in both the spatial and temporal domains in the form of localized modulated waves. The effects of memristive synaptic electromagnetic induction coupling and perturbation on the modulated action potential dynamics examined. Large electromagnetic induction coupling strength may contribute to signal block as the amplitude of modulated waves are observed to decrease. This could help in the development of a chemical brain anaesthesia for some brain pathologies.
Collapse
Affiliation(s)
- A. S. Tankou Tagne
- Laboratory of Nuclear Physics, Department of Physics, Faculty of Science, University of Yaounde I, Cameroon
| | - C. N. Takembo
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaounde I, Cameroon
- * E-mail:
| | - H. G. Ben-Bolie
- Laboratory of Nuclear Physics, Department of Physics, Faculty of Science, University of Yaounde I, Cameroon
| | - P. Owona Ateba
- Laboratory of Nuclear Physics, Department of Physics, Faculty of Science, University of Yaounde I, Cameroon
| |
Collapse
|
14
|
Mondal A, Upadhyay RK, Ma J, Yadav BK, Sharma SK, Mondal A. Bifurcation analysis and diverse firing activities of a modified excitable neuron model. Cogn Neurodyn 2019; 13:393-407. [PMID: 31354884 DOI: 10.1007/s11571-019-09526-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 12/27/2018] [Accepted: 02/20/2019] [Indexed: 11/29/2022] Open
Abstract
Electrical activities of excitable cells produce diverse spiking-bursting patterns. The dynamics of the neuronal responses can be changed due to the variations of ionic concentrations between outside and inside the cell membrane. We investigate such type of spiking-bursting patterns under the effect of an electromagnetic induction on an excitable neuron model. The effect of electromagnetic induction across the membrane potential can be considered to analyze the collective behavior for signal processing. The paper addresses the issue of the electromagnetic flow on a modified Hindmarsh-Rose model (H-R) which preserves biophysical neurocomputational properties of a class of neuron models. The different types of firing activities such as square wave bursting, chattering, fast spiking, periodic spiking, mixed-mode oscillations etc. can be observed using different injected current stimulus. The improved version of the model includes more parameter sets and the multiple electrical activities are exhibited in different parameter regimes. We perform the bifurcation analysis analytically and numerically with respect to the key parameters which reveals the properties of the fast-slow system for neuronal responses. The firing activities can be suppressed/enhanced using the different external stimulus current and by allowing a noise induced current. To study the electrical activities of neural computation, the improved neuron model is suitable for further investigation.
Collapse
Affiliation(s)
- Argha Mondal
- 1Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004 India.,2Computational Neuroscience Center, University of Washington, Seattle, USA
| | - Ranjit Kumar Upadhyay
- 1Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004 India
| | - Jun Ma
- 3Department of Physics, Lanzhou University of Technology, Lanzhou, 730050 People's Republic of China
| | - Binesh Kumar Yadav
- 1Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004 India
| | - Sanjeev Kumar Sharma
- 1Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004 India
| | - Arnab Mondal
- 1Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004 India
| |
Collapse
|
15
|
Park CJ, Park JM. Endoplasmic Reticulum Plays a Critical Role in Integrating Signals Generated by Both Biotic and Abiotic Stress in Plants. FRONTIERS IN PLANT SCIENCE 2019; 10:399. [PMID: 31019523 PMCID: PMC6458287 DOI: 10.3389/fpls.2019.00399] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 03/15/2019] [Indexed: 05/19/2023]
Abstract
Most studies of environmental adaptations in plants have focused on either biotic or abiotic stress factors in an attempt to understand the defense mechanisms of plants against individual stresses. However, in the natural ecosystem, plants are simultaneously exposed to multiple stresses. Stress-tolerant crops developed in translational studies based on a single stress often fail to exhibit the expected traits in the field. To adapt to abiotic stress, recent studies have identified the need for interactions of plants with various microorganisms. These findings highlight the need to understand the multifaceted interactions of plants with biotic and abiotic stress factors. The endoplasmic reticulum (ER) is an organelle that links various stress responses. To gain insight into the molecular integration of biotic and abiotic stress responses in the ER, we focused on the interactions of plants with RNA viruses. This interaction points toward the relevance of ER in viral pathogenicity as well as plant responses. In this mini review, we explore the molecular crosstalk between biotic and abiotic stress signaling through the ER by elaborating ER-mediated signaling in response to RNA viruses and abiotic stresses. Additionally, we summarize the results of a recent study on phytohormones that induce ER-mediated stress response. These studies will facilitate the development of multi-stress-tolerant transgenic crops in the future.
Collapse
Affiliation(s)
- Chang-Jin Park
- Department of Bioresources Engineering, Sejong University, Seoul, South Korea
- Plant Engineering Research Institute, Sejong University, Seoul, South Korea
- *Correspondence: Chang-Jin Park,
| | - Jeong Mee Park
- Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, South Korea
- Department of Biosystems and Bioengineering, University of Science and Technology (UST), Daejeon, South Korea
- Jeong Mee Park,
| |
Collapse
|
16
|
Bayani A, Jafari S, Sprott JC, Hatef B. A chaotic model of migraine headache considering the dynamical transitions of this cyclic disease. ACTA ACUST UNITED AC 2018. [DOI: 10.1209/0295-5075/123/10006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
17
|
Fu YX, Kang YM, Xie Y. Subcritical Hopf Bifurcation and Stochastic Resonance of Electrical Activities in Neuron under Electromagnetic Induction. Front Comput Neurosci 2018; 12:6. [PMID: 29467642 PMCID: PMC5808182 DOI: 10.3389/fncom.2018.00006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Accepted: 01/16/2018] [Indexed: 11/13/2022] Open
Abstract
The FitzHugh–Nagumo model is improved to consider the effect of the electromagnetic induction on single neuron. On the basis of investigating the Hopf bifurcation behavior of the improved model, stochastic resonance in the stochastic version is captured near the bifurcation point. It is revealed that a weak harmonic oscillation in the electromagnetic disturbance can be amplified through stochastic resonance, and it is the cooperative effect of random transition between the resting state and the large amplitude oscillating state that results in the resonant phenomenon. Using the noise dependence of the mean of interburst intervals, we essentially suggest a biologically feasible clue for detecting weak signal by means of neuron model with subcritical Hopf bifurcation. These observations should be helpful in understanding the influence of the magnetic field to neural electrical activity.
Collapse
Affiliation(s)
- Yu-Xuan Fu
- School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an, China
| | - Yan-Mei Kang
- School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an, China
| | - Yong Xie
- School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an, China.,The State Key Laboratory of Strength and Vibration for Mechanical Structures, Xi'an, China
| |
Collapse
|
18
|
Collective responses in electrical activities of neurons under field coupling. Sci Rep 2018; 8:1349. [PMID: 29358677 PMCID: PMC5778049 DOI: 10.1038/s41598-018-19858-1] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 01/09/2018] [Indexed: 11/08/2022] Open
Abstract
Synapse coupling can benefit signal exchange between neurons and information encoding for neurons, and the collective behaviors such as synchronization and pattern selection in neuronal network are often discussed under chemical or electric synapse coupling. Electromagnetic induction is considered at molecular level when ion currents flow across the membrane and the ion concentration is fluctuated. Magnetic flux describes the effect of time-varying electromagnetic field, and memristor bridges the membrane potential and magnetic flux according to the dimensionalization requirement. Indeed, field coupling can contribute to the signal exchange between neurons by triggering superposition of electric field when synapse coupling is not available. A chain network is designed to investigate the modulation of field coupling on the collective behaviors in neuronal network connected by electric synapse between adjacent neurons. In the chain network, the contribution of field coupling from each neuron is described by introducing appropriate weight dependent on the position distance between two neurons. Statistical factor of synchronization is calculated by changing the external stimulus and weight of field coupling. It is found that the synchronization degree is dependent on the coupling intensity and weight, the synchronization, pattern selection of network connected with gap junction can be modulated by field coupling.
Collapse
|
19
|
Ma J, Zhou P, Ahmad B, Ren G, Wang C. Chaos and multi-scroll attractors in RCL-shunted junction coupled Jerk circuit connected by memristor. PLoS One 2018; 13:e0191120. [PMID: 29342178 PMCID: PMC5771607 DOI: 10.1371/journal.pone.0191120] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/28/2017] [Indexed: 11/18/2022] Open
Abstract
In this paper, a new four-variable dynamical system is proposed to set chaotic circuit composed of memristor and Josephson junction, and the dependence of chaotic behaviors on nonlinearity is investigated. A magnetic flux-controlled memristor is used to couple with the RCL-shunted junction circuit, and the dynamical behaviors can be modulated by changing the coupling intensity between the memristor and the RCL-shunted junction. Bifurcation diagram and Lyapunov exponent are calculated to confirm the emergence of chaos in the improved dynamical system. The outputs and dynamical behaviors can be controlled by the initial setting and external stimulus as well. As a result, chaos can be suppressed and spiking occurs in the sampled outputs under negative feedback, while applying positive feedback type via memristor can be effective to trigger chaos. Furthermore, it is found that the number of multi-attractors in the Jerk circuit can be modulated when memristor coupling is applied on the circuit. These results indicate that memristor coupling can be effective to control chaotic circuits and it is also useful to reproduce dynamical behaviors for neuronal activities.
Collapse
Affiliation(s)
- Jun Ma
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, China
- Department of Physics, Lanzhou University of Technology, Lanzhou, China
- * E-mail:
| | - Ping Zhou
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing, China
| | - Bashir Ahmad
- NAAM-Research Group, Department of Mathematics, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Guodong Ren
- Department of Physics, Lanzhou University of Technology, Lanzhou, China
| | - Chunni Wang
- Department of Physics, Lanzhou University of Technology, Lanzhou, China
| |
Collapse
|
20
|
Zangari A, Micheli D, Galeazzi R, Tozzi A. Node of Ranvier as an Array of Bio-Nanoantennas for Infrared Communication in Nerve Tissue. Sci Rep 2018; 8:539. [PMID: 29323217 PMCID: PMC5764955 DOI: 10.1038/s41598-017-18866-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/18/2017] [Indexed: 01/21/2023] Open
Abstract
Electromagnetic radiation, in the visible and infrared spectrum, is increasingly being investigated for its possible role in the most evolved brain capabilities. Beside experimental evidence of electromagnetic cellular interactions, the possibility of light propagation in the axon has been recently demonstrated using computational modelling, although an explanation of its source is still not completely understood. We studied electromagnetic radiation onset and propagation at optical frequencies in myelinated axons, under the assumption that ion channel currents in the node of Ranvier behave like an array of nanoantennas emitting in the wavelength range from 300 to 2500 nm. Our results suggest that the wavelengths below 1600 nm are most likely to propagate throughout myelinated segments. Therefore, a broad wavelength window exists where both generation and propagation could happen, which in turn raises the possibility that such a radiation may play some role in neurotransmission.
Collapse
Affiliation(s)
- Andrea Zangari
- Azienda Ospedaliera San Camillo Forlanini, Pediatric Surgery and Urology Unit, Circonvallazione Gianicolense 87-00152, Roma, Italy
| | - Davide Micheli
- TIM S.P.A., Wireless Access Engineering Department, Viale Parco de' Medici, 61 - 00148, Roma, Italy.
| | - Roberta Galeazzi
- Dipartimento di Scienze della Vita e dell'Ambiente, università Politecnica delle Marche, via Brecce Bianche, 60131, Ancona, Italy
| | - Antonio Tozzi
- UOC Fisica Sanitaria, Azienda USL Toscana Sud Est, via Senese 161, 58100, Grosseto, Italy
| |
Collapse
|
21
|
Zhan F, Liu S. Response of Electrical Activity in an Improved Neuron Model under Electromagnetic Radiation and Noise. Front Comput Neurosci 2017; 11:107. [PMID: 29209192 PMCID: PMC5702444 DOI: 10.3389/fncom.2017.00107] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 11/09/2017] [Indexed: 11/13/2022] Open
Abstract
Electrical activities are ubiquitous neuronal bioelectric phenomena, which have many different modes to encode the expression of biological information, and constitute the whole process of signal propagation between neurons. Therefore, we focus on the electrical activities of neurons, which is also causing widespread concern among neuroscientists. In this paper, we mainly investigate the electrical activities of the Morris-Lecar (M-L) model with electromagnetic radiation or Gaussian white noise, which can restore the authenticity of neurons in realistic neural network. First, we explore dynamical response of the whole system with electromagnetic induction (EMI) and Gaussian white noise. We find that there are slight differences in the discharge behaviors via comparing the response of original system with that of improved system, and electromagnetic induction can transform bursting or spiking state to quiescent state and vice versa. Furthermore, we research bursting transition mode and the corresponding periodic solution mechanism for the isolated neuron model with electromagnetic induction by using one-parameter and bi-parameters bifurcation analysis. Finally, we analyze the effects of Gaussian white noise on the original system and coupled system, which is conducive to understand the actual discharge properties of realistic neurons.
Collapse
Affiliation(s)
- Feibiao Zhan
- School of Mathematics, South China University of Technology, Guangzhou, China
| | - Shenquan Liu
- School of Mathematics, South China University of Technology, Guangzhou, China
| |
Collapse
|
22
|
Yi GS, Wang J, Deng B, Wei XL. Morphology controls how hippocampal CA1 pyramidal neuron responds to uniform electric fields: a biophysical modeling study. Sci Rep 2017; 7:3210. [PMID: 28607422 PMCID: PMC5468310 DOI: 10.1038/s41598-017-03547-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 04/28/2017] [Indexed: 01/24/2023] Open
Abstract
Responses of different neurons to electric field (EF) are highly variable, which depends on intrinsic properties of cell type. Here we use multi-compartmental biophysical models to investigate how morphologic features affect EF-induced responses in hippocampal CA1 pyramidal neurons. We find that the basic morphologies of neuronal elements, including diameter, length, bend, branch, and axon terminals, are all correlated with somatic depolarization through altering the current sources or sinks created by applied field. Varying them alters the EF threshold for triggering action potentials (APs), and then determines cell sensitivity to suprathreshold field. Introducing excitatory postsynaptic potential increases cell excitability and reduces morphology-dependent EF firing threshold. It is also shown that applying identical subthreshold EF results in distinct polarizations on cell membrane with different realistic morphologies. These findings shed light on the crucial role of morphologies in determining field-induced neural response from the point of view of biophysical models. The predictions are conducive to better understanding the variability in modulatory effects of EF stimulation at the cellular level, which could also aid the interpretations of how applied fields activate central nervous system neurons and affect relevant circuits.
Collapse
Affiliation(s)
- Guo-Sheng Yi
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072, China
| | - Jiang Wang
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072, China.
| | - Bin Deng
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072, China
| | - Xi-Le Wei
- School of Electrical and Information Engineering, Tianjin University, Tianjin, 300072, China
| |
Collapse
|
23
|
Xu Y, Ying H, Jia Y, Ma J, Hayat T. Autaptic regulation of electrical activities in neuron under electromagnetic induction. Sci Rep 2017; 7:43452. [PMID: 28240314 PMCID: PMC5327473 DOI: 10.1038/srep43452] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 01/23/2017] [Indexed: 11/09/2022] Open
Abstract
Realistic neurons may hold complex anatomical structure, for example, autapse connection to some internuncial neurons, which this specific synapse can connect to its body via a close loop. Continuous exchanges of charged ions across the membrane can induce complex distribution fluctuation of intracellular and extracellular charged ions of cell, and a time-varying electromagnetic field is set to modulate the membrane potential of neuron. In this paper, an autapse-modulated neuron model is presented and the effect of electromagnetic induction is considered by using magnetic flux. Bifurcation analysis and sampled time series for membrane potentials are calculated to investigate the mode transition in electrical activities and the biological function of autapse connection is discussed. Furthermore, the Gaussian white noise and electromagnetic radiation are considered on the improved neuron model, it is found appropriate setting and selection for feedback gain and time delay in autapse can suppress the bursting in neuronal behaviors. It indicates the formation of autapse can enhance the self-adaption of neuron so that appropriate response to external forcing can be selected, this biological function is helpful for encoding and signal propagation of neurons. It can be useful for investigation about collective behaviors in neuronal networks exposed to electromagnetic radiation.
Collapse
Affiliation(s)
- Ying Xu
- Department of Physics, Lanzhou University of Technology, Lanzhou 730050, China.,Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan 430079, China
| | - Heping Ying
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - Ya Jia
- Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan 430079, China
| | - Jun Ma
- Department of Physics, Lanzhou University of Technology, Lanzhou 730050, China.,King Abdulaziz Univ, Fac Sci, Dept Math, NAAM Res Grp, Jeddah 21589, Saudi Arabia
| | - Tasawar Hayat
- King Abdulaziz Univ, Fac Sci, Dept Math, NAAM Res Grp, Jeddah 21589, Saudi Arabia.,Quaid I Azam Univ, Dept Math, Islamabad 44000, Pakistan
| |
Collapse
|