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Bakalis E, Gavriil V, Cefalas AC, Kollia Z, Zerbetto F, Sarantopoulou E. Viscoelasticity and Noise Properties Reveal the Formation of Biomemory in Cells. J Phys Chem B 2021; 125:10883-10892. [PMID: 34546052 PMCID: PMC8503882 DOI: 10.1021/acs.jpcb.1c01752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
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Living cells are
neither perfectly elastic nor liquid and return
a viscoelastic response to external stimuli. Nanoindentation provides
force–distance curves, allowing the investigation of cell mechanical
properties, and yet, these curves can differ from point to point on
the cell surface, revealing its inhomogeneous character. In the present
work, we propose a mathematical method to estimate both viscoelastic
and noise properties of cells as these are depicted on the values
of the scaling exponents of relaxation function and power spectral
density, respectively. The method uses as input the time derivative
of the response force in a nanoindentation experiment. Generalized
moments method and/or rescaled range analysis is used to study the
resulting time series depending on their nonstationary or stationary
nature. We conducted experiments in living Ulocladium
chartarum spores. We found that spores in the approaching
phase present a viscoelastic behavior with the corresponding scaling
exponent in the range 0.25–0.52 and in the retracting phase
present a liquid-like behavior with exponents in the range 0.67–0.85.
This substantial difference of the scaling exponents in the two phases
suggests the formation of biomemory as a response of the spores to
the indenting AFM mechanical stimulus. The retracting phase may be
described as a process driven by bluish noises, while the approaching
one is driven by persistent noise.
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Affiliation(s)
- Evangelos Bakalis
- Dipartimento di Chimica "G. Ciamician", Universita di Bologna, V. F. Selmi 2, Bologna 40126, Italy
| | - Vassilios Gavriil
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Alkiviadis-Constantinos Cefalas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Zoe Kollia
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Francesco Zerbetto
- Dipartimento di Chimica "G. Ciamician", Universita di Bologna, V. F. Selmi 2, Bologna 40126, Italy
| | - Evangelia Sarantopoulou
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
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2
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Aguilar EJ, Barbosa VC, Donangelo R, Souza SR. Interspecies evolutionary dynamics mediated by public goods in bacterial quorum sensing. Phys Rev E 2021; 103:012403. [PMID: 33601496 DOI: 10.1103/physreve.103.012403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Accepted: 12/15/2020] [Indexed: 11/07/2022]
Abstract
Bacterial quorum sensing is the communication that takes place between bacteria as they secrete certain molecules into the intercellular medium that later get absorbed by the secreting cells themselves and by others. Depending on cell density, this uptake has the potential to alter gene expression and thereby affect global properties of the community. We consider the case of multiple bacterial species coexisting, referring to each one of them as a genotype and adopting the usual denomination of the molecules they collectively secrete as public goods. A crucial problem in this setting is characterizing the coevolution of genotypes as some of them secrete public goods (and pay the associated metabolic costs) while others do not but may nevertheless benefit from the available public goods. We introduce a network model to describe genotype interaction and evolution when genotype fitness depends on the production and uptake of public goods. The model comprises a random graph to summarize the possible evolutionary pathways the genotypes may take as they interact genetically with one another, and a system of coupled differential equations to characterize the behavior of genotype abundance in time. We study some simple variations of the model analytically and more complex variations computationally. Our results point to a simple trade-off affecting the long-term survival of those genotypes that do produce public goods. This trade-off involves, on the producer side, the impact of producing and that of absorbing the public good. On the nonproducer side, it involves the impact of absorbing the public good as well, now compounded by the molecular compatibility between the producer and the nonproducer. Depending on how these factors turn out, producers may or may not survive.
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Affiliation(s)
- Eduardo J Aguilar
- Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Rodovia José Aurélio Vilela, 11999, 37715-400 Poços de Caldas, Minais Gerais, Brazil
| | - Valmir C Barbosa
- Programa de Engenharia de Sistemas e Computação, COPPE, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Sala H-319, 21941-914 Rio de Janeiro, Rio de Janeiro, Brazil
| | - Raul Donangelo
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Julio Herrera y Reissig 565, 11300 Montevideo, Uruguay.,Instituto de Física, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco A, 21941-909 Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sergio R Souza
- Instituto de Física, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco A, 21941-909 Rio de Janeiro, Rio de Janeiro, Brazil.,Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, 31270-901 Belo Horizonte, Minais Gerais, Brazil
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3
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Senthilkumar R, Vasudevan P, Prabhu S. Neural network and multi-objective optimization of confined flow characteristics on circular cylinder in standing double vortex region. Neural Comput Appl 2020. [DOI: 10.1007/s00521-020-05079-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shi RQ, Ren JN, Wang CH. Stability analysis and Hopf bifurcation of a fractional order mathematical model with time delay for nutrient-phytoplankton-zooplankton. Math Biosci Eng 2020; 17:3836-3868. [PMID: 32987557 DOI: 10.3934/mbe.2020214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In recent years, some researchers paid their attention to the interaction between toxic phytoplankton and zooplankton. Their studies showed that the mechanism of food selection in zooplankton is still immature and when different algae of the same species (toxic and nontoxic) coexist, some zooplankton may not be able to distinguish between toxic and nontoxic algae, and even show a slight preference for toxic strains. Thus, in this article, a fractional order mathematical model with time delay is constructed to describe the interaction of nutrient-phytoplankton-toxic phytoplankton-zooplankton. The main purpose of this paper is to study the influence of fractional order and time delay on the ecosystem. The sufficient conditions for the existence and local stability of each equilibrium are obtained by using fractional order stability theory. By choosing time delay as the bifurcation parameter, we find that Hopf bifurcation occurs when the time delay passes through a sequence of critical values. After that, some numerical simulations are performed to support the analytic results. At last we make some conclusion and point out some possible future work.
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Affiliation(s)
- Rui Qing Shi
- School of Mathematics and Computer Science, Shanxi Normal University, Linfen, 041004, China
| | - Jia Ning Ren
- School of Mathematics and Computer Science, Shanxi Normal University, Linfen, 041004, China
| | - Cui Hong Wang
- School of Mathematics and Computer Science, Shanxi Normal University, Linfen, 041004, China
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5
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Mikhaylov A, Pimashkin A, Pigareva Y, Gerasimova S, Gryaznov E, Shchanikov S, Zuev A, Talanov M, Lavrov I, Demin V, Erokhin V, Lobov S, Mukhina I, Kazantsev V, Wu H, Spagnolo B. Neurohybrid Memristive CMOS-Integrated Systems for Biosensors and Neuroprosthetics. Front Neurosci 2020; 14:358. [PMID: 32410943 PMCID: PMC7199501 DOI: 10.3389/fnins.2020.00358] [Citation(s) in RCA: 110] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 03/24/2020] [Indexed: 11/18/2022] Open
Abstract
Here we provide a perspective concept of neurohybrid memristive chip based on the combination of living neural networks cultivated in microfluidic/microelectrode system, metal-oxide memristive devices or arrays integrated with mixed-signal CMOS layer to control the analog memristive circuits, process the decoded information, and arrange a feedback stimulation of biological culture as parts of a bidirectional neurointerface. Our main focus is on the state-of-the-art approaches for cultivation and spatial ordering of the network of dissociated hippocampal neuron cells, fabrication of a large-scale cross-bar array of memristive devices tailored using device engineering, resistive state programming, or non-linear dynamics, as well as hardware implementation of spiking neural networks (SNNs) based on the arrays of memristive devices and integrated CMOS electronics. The concept represents an example of a brain-on-chip system belonging to a more general class of memristive neurohybrid systems for a new-generation robotics, artificial intelligence, and personalized medicine, discussed in the framework of the proposed roadmap for the next decade period.
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Affiliation(s)
- Alexey Mikhaylov
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Alexey Pimashkin
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Yana Pigareva
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | | | - Evgeny Gryaznov
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Sergey Shchanikov
- Department of Information Technologies, Vladimir State University, Murom, Russia
| | - Anton Zuev
- Department of Information Technologies, Vladimir State University, Murom, Russia
| | - Max Talanov
- Neuroscience Laboratory, Kazan Federal University, Kazan, Russia
| | - Igor Lavrov
- Department of Neurologic Surgery, Mayo Clinic, Rochester, MN, United States
- Laboratory of Motor Neurorehabilitation, Kazan Federal University, Kazan, Russia
| | | | - Victor Erokhin
- Neuroscience Laboratory, Kazan Federal University, Kazan, Russia
- Kurchatov Institute, Moscow, Russia
- CNR-Institute of Materials for Electronics and Magnetism, Italian National Research Council, Parma, Italy
| | - Sergey Lobov
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Center for Technologies in Robotics and Mechatronics Components, Innopolis University, Innopolis, Russia
| | - Irina Mukhina
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Cell Technology Group, Privolzhsky Research Medical University, Nizhny Novgorod, Russia
| | - Victor Kazantsev
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Center for Technologies in Robotics and Mechatronics Components, Innopolis University, Innopolis, Russia
| | - Huaqiang Wu
- Institute of Microelectronics, Tsinghua University, Beijing, China
| | - Bernardo Spagnolo
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
- Dipartimento di Fisica e Chimica-Emilio Segrè, Group of Interdisciplinary Theoretical Physics, Università di Palermo and CNISM, Unità di Palermo, Palermo, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, Italy
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Musco M, Cuttitta A, Bicchi E, Quinci EM, Sprovieri M, Tranchida G, Giaramita L, Traina A, Salvagio Manta D, Gherardi S, Mercurio P, Siragusa A, Mazzola S. Benthic Foraminifera as bio-indicators of anthropogenic impacts in coastal environments: Acqua dei Corsari area case study (Palermo, Italy). Mar Pollut Bull 2017; 117:75-87. [PMID: 28153497 DOI: 10.1016/j.marpolbul.2017.01.032] [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: 09/05/2016] [Revised: 01/10/2017] [Accepted: 01/16/2017] [Indexed: 06/06/2023]
Abstract
This study investigates living benthic foraminiferal assemblages as bio-indicators of anthropogenic activities in a coastal area within the Gulf of Palermo (Sicily, Italy), affected by industrial and urban activities, and evaluates the environmental quality through the calibration of a Tolerant Species index (%TSstd). Sediments from 6 stations were sampled along a bathymetric transect from the coast to offshore. Sediment grain size, TOC, major, minor and trace elements and polycyclic aromatic hydrocarbons (PAHs) were compared to benthic foraminiferal assemblages and species at each station. Diversity and density of benthic foraminiferal assemblages were not affected by the presence of pollutants, while tolerant species increased with organic (TOC and PAHs) or chemical (As and Pb) concentrations. Moreover, the calibration of the %TSstd formula to >125μm foraminiferal assemblage, gives a detailed description of environmental quality along the transect, representing a good and sensitive tool to evaluate marine coastal environment.
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Affiliation(s)
- Marianna Musco
- Laboratory of Molecular Ecology and Biotechnology, Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Angela Cuttitta
- Laboratory of Molecular Ecology and Biotechnology, Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Erica Bicchi
- Esaip La Salle, 18 Rue du 8 Mai 1945, CS 80022, 49180 St Barthélemy d'Anjou Cedex, France; LPG-BIAF-UMR6112, Université d'Angers, France.
| | - Enza Maria Quinci
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Mario Sprovieri
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Giorgio Tranchida
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Luigi Giaramita
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Anna Traina
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Daniela Salvagio Manta
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Capo Granitola, 3 Via del Mare, 91021, Torretta Granitola, Campobello di Mazara, Tp, Italy.
| | - Serena Gherardi
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Naples, Calata Porta di Massa, 80133 Napoli, Italy.
| | | | | | - Salvatore Mazzola
- Institute for Coastal Marine Environment of the National Research Council (IAMC-CNR), Section of Naples, Calata Porta di Massa, 80133 Napoli, Italy.
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7
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Ayadi N, Zghal I, Aloulou F, Bouzid J. Impacts of several pollutants on the distribution of recent benthic foraminifera: the southern coast of Gulf of Gabes, Tunisia. Environ Sci Pollut Res Int 2016; 23:6414-6429. [PMID: 26620866 DOI: 10.1007/s11356-015-5872-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 08/31/2015] [Accepted: 11/23/2015] [Indexed: 06/05/2023]
Abstract
In addition to physicochemical methods, benthic foraminifera have become an essential tool for the assessment of polluted environments. The main objectives of the present work were to study the distribution of benthic foraminifera along the coastline of Skhira and Gabes (southern coast of Gulf of Gabes) and to predict the impact of pollution on these organisms. Thirty-one samples were studied and a polluted area was delimited by chemical analysis, where heavy metal, fluoride, phosphorus, nitrogen, and COT contents are very high. Thirty-four species of benthic foraminifera were identified and their response to pollution is very remarkable, in which their distribution shows barren area, corresponding to the highly polluted area. Away from the contaminated area, the density and the diversity of these organisms increase. Statistical analyses (principal component analysis (PCA)/FA and matrix correlation) show a possible control of these pollutants on biotic indices (with negative correlation), in addition to the presence of tolerant and sensitive species to pollution. A variety of test malformations were noticed especially in Ammonia beccarii, Peneroplis planatus, Sorites variabilis, and Adelosina pulchella. Unpolluted stations were dominated by species characteristic of shallow water environments with sandy sediment such Ammonia parkinsoniana, Triloculina trigonula, Quinqueloculina agglutinans, and P. planatus.
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Affiliation(s)
- N Ayadi
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia.
| | - I Zghal
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
| | - F Aloulou
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
| | - J Bouzid
- Laboratory Water, Energy and Environment LR3, National School of Engineers of Sfax, Route de Soukra Km4.5 BP W, 3038, Sfax, Tunisia
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Zeng C, Zhang C, Zeng J, Luo H, Tian D, Zhang H, Long F, Xu Y. Noises-induced regime shifts and -enhanced stability under a model of lake approaching eutrophication. Ecological Complexity 2015; 22:102-8. [DOI: 10.1016/j.ecocom.2015.02.005] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Raja Sekhara Rao P, Naresh Kumar M. A dynamic model for infectious diseases: The role of vaccination and treatment. Chaos Solitons Fractals 2015; 75:34-49. [PMID: 32288363 PMCID: PMC7126230 DOI: 10.1016/j.chaos.2015.02.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 02/02/2015] [Indexed: 06/11/2023]
Abstract
Understanding dynamics of an infectious disease helps in designing appropriate strategies for containing its spread in a population. Recent mathematical models are aimed at studying dynamics of some specific types of infectious diseases. In this paper we propose a new model for infectious diseases spread having susceptible, infected, and recovered populations and study its dynamics in presence of incubation delays and relapse of the disease. The influence of treatment and vaccination efforts on the spread of infection in presence of time delays are studied. Sufficient conditions for local stability of the equilibria and change of stability are derived in various cases. The problem of global stability is studied for an important special case of the model. Simulations carried out in this study brought out the importance of treatment rate in controlling the disease spread. It is observed that incubation delays have influence on the system even under enhanced vaccination. The present study has clearly brought out the fact that treatment rate even in presence of time delays would contain the disease as compared to popular belief that eradication can only be done through vaccination.
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Affiliation(s)
- P. Raja Sekhara Rao
- Department of Mathematics, Government Polytechnic, Addanki, A.P. 523 201, India
| | - M. Naresh Kumar
- Software Group, National Remote Sensing Center (ISRO), Hyderabad, Telangana 500 037, India
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Valenti D, Denaro G, Spagnolo B, Conversano F, Brunet C. How diffusivity, thermocline and incident light intensity modulate the dynamics of deep chlorophyll maximum in Tyrrhenian Sea. PLoS One 2015; 10:e0115468. [PMID: 25629963 PMCID: PMC4309620 DOI: 10.1371/journal.pone.0115468] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 11/23/2014] [Indexed: 11/22/2022] Open
Abstract
During the last few years theoretical works have shed new light and proposed new hypotheses on the mechanisms which regulate the spatio-temporal behaviour of phytoplankton communities in marine pelagic ecosystems. Despite this, relevant physical and biological issues, such as effects of the time-dependent mixing in the upper layer, competition between groups, and dynamics of non-stationary deep chlorophyll maxima, are still open questions. In this work, we analyze the spatio-temporal behaviour of five phytoplankton populations in a real marine ecosystem by using a one-dimensional reaction-diffusion-taxis model. The study is performed, taking into account the seasonal variations of environmental variables, such as light intensity, thickness of upper mixed layer and profiles of vertical turbulent diffusivity, obtained starting from experimental findings. Theoretical distributions of phytoplankton cell concentration was converted in chlorophyll concentration, and compared with the experimental profiles measured in a site of the Tyrrhenian Sea at four different times (seasons) of the year, during four different oceanographic cruises. As a result we find a good agreement between theoretical and experimental distributions of chlorophyll concentration. In particular, theoretical results reveal that the seasonal changes of environmental variables play a key role in the phytoplankton distribution and determine the properties of the deep chlorophyll maximum. This study could be extended to other marine ecosystems to predict future changes in the phytoplankton biomass due to global warming, in view of devising strategies to prevent the decline of the primary production and the consequent decrease of fish species.
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Affiliation(s)
- Davide Valenti
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Theoretical Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
- * E-mail:
| | - Giovanni Denaro
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Theoretical Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
| | - Bernardo Spagnolo
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Theoretical Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, Italy
- Radiophysics Department, Lobachevsky State University, Nizhniy Novgorod, Russia
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11
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Bailey RT, Ahmadi M. Spatial and temporal variability of in-stream water quality parameter influence on dissolved oxygen and nitrate within a regional stream network. Ecol Modell 2014. [DOI: 10.1016/j.ecolmodel.2014.01.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Cosentino C, Pepe F, Scopelliti G, Calabrò M, Caruso A. Benthic foraminiferal response to trace element pollution-the case study of the Gulf of Milazzo, NE Sicily (Central Mediterranean Sea). Environ Monit Assess 2013; 185:8777-8802. [PMID: 23828269 DOI: 10.1007/s10661-013-3292-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Accepted: 05/30/2013] [Indexed: 06/02/2023]
Abstract
The response of benthic foraminiferal assemblages to trace element pollution in the marine sediments of the Gulf of Milazzo (north-eastern Sicily) was investigated. Since the 1960s, this coastal area has been a preferred site for the development of two small marinas and a commercial harbour as well as for heavy industry. Forty samples collected in the uppermost 3-4 cm of an undisturbed layer of sediment in the littoral environment were used for this benthic foraminiferal analysis. The enrichment factors (EFs) of selected trace elements (As, Co, Cr, Cu, Mn, Ni, Pb and Zn) were also calculated. Changes both in benthic foraminiferal assemblages and in some trace elements concentrations have provided evidence that the gulf's littoral zone can be subdivided into three sectors characterised by environmental changes in the marine ecosystem. In the sector unpolluted, close to the Milazzo Cape, foraminiferal assemblages exhibit high values of species richness and foraminiferal density while trace element concentrations and their EFs are very low. Here, the highest densities of Miliolids and epiphytic species are present. On the contrary, in the sector polluted, from the marinas to the crude oil refinery, foraminiferal density and species diversity are low, and assemblages are dominated, albeit with very low densities, by species that tolerate stressed environmental conditions, such as LOFAs, agglutinants and Ammonia spp. Here, the highest trace elements concentrations of Pb, Zn and Cu and related EFs were detected. Eastwards, in the sector moderately polluted, foraminiferal populations are quite poor. They are characterised by low values of species richness and foraminiferal densities, nevertheless trace element concentrations become lower than in the other sectors and their EFs are often below 1. Deformed foraminifera, with percentages up to 7.14 %, were found in all three of the sectors. Differences in benthic foraminiferal assemblages, coupled with results from statistical analysis, indicate that anthropogenic trace element pollution could be considered as one of the most important causes of the modifications of foraminiferal assemblages in the study area.
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Affiliation(s)
- Claudia Cosentino
- Dipartimento di Scienze della Terra e del Mare, Università di Palermo, Via Archirafi, 22, 90123, Palermo, Italy
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Denaro G, Valenti D, Spagnolo B, Basilone G, Mazzola S, Zgozi SW, Aronica S, Bonanno A. Dynamics of two picophytoplankton groups in mediterranean sea: analysis of the deep chlorophyll maximum by a stochastic advection-reaction-diffusion model. PLoS One 2013; 8:e66765. [PMID: 23826130 PMCID: PMC3691268 DOI: 10.1371/journal.pone.0066765] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 05/13/2013] [Indexed: 11/25/2022] Open
Abstract
A stochastic advection-reaction-diffusion model with terms of multiplicative white Gaussian noise, valid for weakly mixed waters, is studied to obtain the vertical stationary spatial distributions of two groups of picophytoplankton, i.e., picoeukaryotes and Prochlorococcus, which account about for 60% of total chlorophyll on average in Mediterranean Sea. By numerically solving the equations of the model, we analyze the one-dimensional spatio-temporal dynamics of the total picophytoplankton biomass and nutrient concentration along the water column at different depths. In particular, we integrate the equations over a time interval long enough, obtaining the steady spatial distributions for the cell concentrations of the two picophytoplankton groups. The results are converted into chlorophyll a and divinil chlorophyll a concentrations and compared with experimental data collected in two different sites of the Sicily Channel (southern Mediterranean Sea). The comparison shows that real distributions are well reproduced by theoretical profiles. Specifically, position, shape and magnitude of the theoretical deep chlorophyll maximum exhibit a good agreement with the experimental values.
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Affiliation(s)
- Giovanni Denaro
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
| | - Davide Valenti
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
| | - Bernardo Spagnolo
- Dipartimento di Fisica e Chimica, Università di Palermo, Group of Interdisciplinary Physics and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Unità di Palermo, Palermo, Italy
| | - Gualtiero Basilone
- Istituto per l’Ambiente Marino Costiero, Centro Nazionale delle Ricerche, Unità Operativa di Supporto di Capo Granitola, Campobello di Mazara, Trapani, Italy
| | - Salvatore Mazzola
- Istituto per l’Ambiente Marino Costiero, Centro Nazionale delle Ricerche, Unità Operativa di Supporto di Capo Granitola, Campobello di Mazara, Trapani, Italy
| | | | - Salvatore Aronica
- Istituto per l’Ambiente Marino Costiero, Centro Nazionale delle Ricerche, Unità Operativa di Supporto di Capo Granitola, Campobello di Mazara, Trapani, Italy
| | - Angelo Bonanno
- Istituto per l’Ambiente Marino Costiero, Centro Nazionale delle Ricerche, Unità Operativa di Supporto di Capo Granitola, Campobello di Mazara, Trapani, Italy
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Müller F, Schimansky-Geier L, Postnov D. Interaction of noise supported Ising–Bloch fronts with Dirichlet boundaries. Ecological Complexity 2013. [DOI: 10.1016/j.ecocom.2012.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Denaro G, Valenti D, La Cognata A, Spagnolo B, Bonanno A, Basilone G, Mazzola S, Zgozi S, Aronica S, Brunet C. Spatio-temporal behaviour of the deep chlorophyll maximum in Mediterranean Sea: Development of a stochastic model for picophytoplankton dynamics. Ecological Complexity 2013. [DOI: 10.1016/j.ecocom.2012.10.002] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Valenti D, Giuffrida A, Ziino G, Giarratana F, Spagnolo B, Panebianco A. Modelling Bacterial Dynamics in Food Products: Role of Environmental Noise and Interspecific Competition. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jmp.2013.48142] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chichigina OA, Dubkov AA, Valenti D, Spagnolo B. Stability in a system subject to noise with regulated periodicity. Phys Rev E Stat Nonlin Soft Matter Phys 2011; 84:021134. [PMID: 21928976 DOI: 10.1103/physreve.84.021134] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2011] [Indexed: 05/31/2023]
Abstract
The stability of a simple dynamical system subject to multiplicative one-side pulse noise with hidden periodicity is investigated both analytically and numerically. The stability analysis is based on the exact result for the characteristic functional of the renewal pulse process. The influence of the memory effects on the stability condition is analyzed for two cases: (i) the dead-time-distorted poissonian process, and (ii) the renewal process with Pareto distribution. We show that, for fixed noise intensity, the system can be stable when the noise is characterized by high periodicity and unstable at low periodicity.
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Affiliation(s)
- Olga A Chichigina
- Physics Department, Lomonosov Moscow State University, 119992 Moscow, Russia.
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Frontalini F, Coccioni R. Benthic foraminifera as bioindicators of pollution: A review of Italian research over the last three decades. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.revmic.2011.03.001] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Giuffrida A, Valenti D, Ziino G, Spagnolo B, Panebianco A. A stochastic interspecific competition model to predict the behaviour of Listeria monocytogenes in the fermentation process of a traditional Sicilian salami. Eur Food Res Technol 2009; 228:767-75. [DOI: 10.1007/s00217-008-0988-6] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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