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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] [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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Changes in CO2 Soil Degassing Style as a Possible Precursor to Volcanic Activity: The 2019 Case of Stromboli Paroxysmal Eruptions. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10144757] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Paroxysmal explosions are some of the most spectacular evidence of volcanism on Earth and are triggered by the rapid ascent of volatile-rich magma. These explosions often occur in persistently erupting basaltic volcanoes located in subduction zones and represent a major hazard due to the sudden occurrence and wide impact on the neighboring populations. However, the recognition of signals that forecast these blasts remains challenging even in the best-monitored volcanoes. Here, we present the results of the regular monitoring of soil CO2 flux from a fumarole field at the summit of Stromboli (Italy), highlighting that the 2016–2019 period was characterized by two important phases of strong increases of volatile output rate degassing (24 g m2 d−2 and 32 g m2 d−2, respectively) and moreover by significant changes in the degassing style few months before the last paroxysmal explosions occurred in the summer 2019 (3 July and 28 August). Establish that the deep portions of a volcano plumbing system are refilled by new volatiles-rich magma intruding from the mantle is therefore a key factor for forecasting eruptions and helping in recognizing possible precursors of paroxysmal explosions and could be highlighted by the monitoring of soil CO2 flux. The abrupt increase of degassing rate coupled with the strong increase of fluctuating signal (daily natural deviation) recorded during 2019 at Stromboli could be the key to predicting the occurrence of paroxysmal events.
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Bakalis E, Parent LR, Vratsanos M, Park C, Gianneschi NC, Zerbetto F. Complex Nanoparticle Diffusional Motion in Liquid-Cell Transmission Electron Microscopy. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:14881-14890. [PMID: 33841603 PMCID: PMC8023318 DOI: 10.1021/acs.jpcc.0c03203] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 06/10/2020] [Indexed: 06/01/2023]
Abstract
Liquid-cell transmission electron microscopy (LCTEM) is a powerful in situ videography technique that has the potential to allow us to observe solution-phase dynamic processes at the nanoscale, including imaging the diffusion and interaction of nanoparticles. Artefactual effects imposed by the irradiated and confined liquid-cell vessel alter the system from normal "bulk-like" behavior in multiple ways. These artefactual LCTEM effects will leave their fingerprints in the motion behavior of the diffusing objects, which can be revealed through careful analysis of the object-motion trajectories. Improper treatment of the motion data can lead to erroneous descriptions of the LCTEM system's conditions. Here, we advance our anomalous diffusion object-motion analysis (ADOMA) method to extract a detailed description of the liquid-cell system conditions during any LCTEM experiment by applying a multistep analysis of the data and treating the x/y vectors of motion independently and in correlation with each other and with the object's orientation/angle.
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Affiliation(s)
- Evangelos Bakalis
- Dipartimento
di Chimica “G. Ciamician”, Universita di Bologna, V. F. Selmi 2, 40126 Bologna, Italy
| | - Lucas R. Parent
- Innovation
Partnership Building, The University of
Connecticut, Storrs, Connecticut 06269, United States
| | - Maria Vratsanos
- Department
of Materials Science & Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Chiwoo Park
- Department
of Industrial and Manufacturing Engineering, Florida State University, Tallahassee, Florida 32306, United States
| | - Nathan C. Gianneschi
- Department
of Chemistry, Department of Materials Science & Engineering, and
Department of Biomedical Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Francesco Zerbetto
- Dipartimento
di Chimica “G. Ciamician”, Universita di Bologna, V. F. Selmi 2, 40126 Bologna, Italy
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Mandalakis M, Gavriilidou A, Polymenakou PN, Christakis CA, Nomikou P, Medvecký M, Kilias SP, Kentouri M, Kotoulas G, Magoulas A. Microbial strains isolated from CO 2-venting Kolumbo submarine volcano show enhanced co-tolerance to acidity and antibiotics. MARINE ENVIRONMENTAL RESEARCH 2019; 144:102-110. [PMID: 30654982 DOI: 10.1016/j.marenvres.2019.01.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 12/31/2018] [Accepted: 01/03/2019] [Indexed: 06/09/2023]
Abstract
As ocean acidification intensifies, there is growing global concern about the impacts that future pH levels are likely to have on marine life and ecosystems. By analogy, a steep decrease of seawater pH with depth is encountered inside the Kolumbo submarine volcano (northeast Santorini) as a result of natural CO2 venting, making this system ideal for ocean acidification research. Here, we investigated whether the increase of acidity towards deeper layers of Kolumbo crater had any effect on relevant phenotypic traits of bacterial isolates. A total of 31 Pseudomonas strains were isolated from both surface- (SSL) and deep-seawater layers (DSL), with the latter presenting a significantly higher acid tolerance. In particular, the DSL strains were able to cope with H+ levels that were 18 times higher. Similarly, the DSL isolates exhibited a significantly higher tolerance than SSL strains against six commonly used antibiotics and As(III). More importantly, a significant positive correlation was revealed between antibiotics and acid tolerance across the entire set of SSL and DSL isolates. Our findings imply that Pseudomonas species with higher resilience to antibiotics could be favored by the prospect of acidifying oceans. Further studies are required to determine if this feature is universal across marine bacteria and to assess potential ecological impacts.
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Affiliation(s)
- Manolis Mandalakis
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece.
| | - Asimenia Gavriilidou
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece
| | - Paraskevi N Polymenakou
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece
| | - Christos A Christakis
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece
| | - Paraskevi Nomikou
- Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimioupoli Zographou, 15784, Athens, Greece
| | - Matej Medvecký
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, 61137, Brno, Czech Republic; Veterinary Research Institute, 62100, Brno, Czech Republic
| | - Stephanos P Kilias
- Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimioupoli Zographou, 15784, Athens, Greece
| | - Maroudio Kentouri
- Department of Biology, University of Crete, 70013, Heraklion, Greece
| | - Georgios Kotoulas
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece
| | - Antonios Magoulas
- Institute of Marine Biology, Biotechnology and Aquaculture, Hellenic Centre for Marine Research, 71500, Heraklion, Greece
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Temperature and Conductivity as Indicators of the Morphology and Activity of a Submarine Volcano: Avyssos (Nisyros) in the South Aegean Sea, Greece. GEOSCIENCES 2018. [DOI: 10.3390/geosciences8060193] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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