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  • 1
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    More than one dynamic crossover in protein hydration water [Applied Physical Sciences] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-12-14
    Description: Studies of liquid water in its supercooled region have helped us better understand the structure and behavior of water. Bulk water freezes at its homogeneous nucleation temperature (approximately 235 K), but protein hydration water avoids this crystallization because each water molecule binds to a protein. Here, we study the dynamics of the hydrogen bond (HB) network of a percolating layer of water molecules and compare the measurements of a hydrated globular protein with the results of a coarse-grained model that successfully reproduces the properties of hydration water. Using dielectric spectroscopy, we measure the temperature dependence of the relaxation time of proton charge fluctuations. These fluctuations are associated with the dynamics of the HB network of water molecules adsorbed on the protein surface. Using Monte Carlo simulations and mean-field calculations, we study the dynamics and thermodynamics of the model. Both experimental and model analyses are consistent with the interesting possibility of two dynamic crossovers, (i) at approximately 252 K and (ii) at approximately 181 K. Because the experiments agree with the model, we can relate the two crossovers to the presence at ambient pressure of two specific heat maxima. The first is caused by fluctuations in the HB formation, and the second, at a lower temperature, is due to the cooperative reordering of the HB network.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    GEMS: Underwater spectrometer for long-term radioactivity measurements (2011)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: GEMS (Gamma Energy Marine Spectrometer) is a prototype of an autonomous radioactivity sensor for underwater measurements, developed in the framework for a development of a submarine telescope for neutrino detection (KM3NeT Design Study Project). The spectrometer is highly sensitive to gamma rays produced by 40K decays but it can detect other natural (e.g., 238U,232Th) and anthropogenic radio-nuclides (e.g., 137Cs). GEMS was firstly tested and calibrated in the laboratory using known sources and it was successfully deployed for a long-term (6 months) monitoring at a depth of 3200 m in the Ionian Sea (Capo Passero, offshore Eastern Sicily). The instrument recorded data for the whole deployment period within the expected specifications. This monitoring provided, for the first time, a continuous time-series of radioactivity in deep-sea.
    Description: Published
    Description: S145–S147
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: JCR Journal
    Description: restricted
    Keywords: NaI(Tl) sensor ; Underwater spectrometer ; Marine radioactivity ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 3
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    Hydrological and Physical Characterization of Cinque Terre Marine Protected Area (Ligurian Sea) and Evaluation of Current Velocity and Direction by AUV Navigation Tracks (2011)
    IEEE
    Details
    Publication Date: 2017-04-04
    Description: An integrated study, concerning the experimental observations, was performed during the oceanographic cruises on-board the two NURC research vessels, in the period between 2008 and 2010 in the Marine Protected Area of Cinque Terre (North-West Mediterranean Sea, Italy). The aim of the research is to describe the environmental features using both hydrological parameters and AUV navigation tracks, acquired respectively by a multi-parametric platform (MEDUSA) and AUV MUSCLE. The innovative contribution of this work is the possibility to evaluate the bottom stream without direct current measurements, but using the navigation data recorded by AUV. This work is a complementary analysis to environmental support of the ENI S.p.A. Exploration and Production Division project.
    Description: Unpublished
    Description: Seattle, USA
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: restricted
    Keywords: Hydrology ; AUV ; Cinque Terre ; Ligurian Sea ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 4
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    Hydrological and Physical Characterization of Cinque Terre Marine Protected Area (Ligurian Sea) and Evaluation of Current Velocity and Direction by AUV Navigation Tracks (2011)
    IEEE
    Details
    Publication Date: 2017-04-04
    Description: The integrated study, concerning the experimental observations, was performed during the oceanographic cruises on-board the two NURC research vessels, in the period between 2008 and 2010 in the Marine Protected Area of Cinque Terre (North-West Mediterranean Sea, Italy). The aim of the research is to describe the environmental features using both hydrological parameters and AUV navigation tracks, acquired respectively by a multi-parametric platform (MEDUSA) and AUV MUSCLE. The innovative contribution of this work is the possibility to evaluate the bottom stream without direct current measurements, but using the navigation data recorded by AUV. This work is a complementary analysis to environmental support of the ENI S.p.A. Exploration and Production Division project.
    Description: Published
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: N/A or not JCR
    Description: restricted
    Keywords: Hydrology ; AUV ; Cinque Terre ; Ligurian Sea ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 5
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    Hydrological and physical characterization of Cinque Terre Marine Protected Area (Ligurian Sea) and evaluation of current velocity and direction by AUV navigation tracks (2011)
    IEEE
    Details
    Publication Date: 2017-04-04
    Description: The integrated study, concerning the experimental observations, was performed during the oceanographic cruises on-board the two NURC research vessels, in the period between 2008 and 2010 in the Marine Protected Area of Cinque Terre (North-West Mediterranean Sea, Italy). The aim of the research is to describe the environmental features using both hydrological parameters and AUV navigation tracks, acquired respectively by a multi-parametric platform (MEDUSA) and AUV MUSCLE. The innovative contribution of this work is the possibility to evaluate the bottom stream without direct current measurements, but using the navigation data recorded by AUV. This work is a complementary analysis to environmental support of the ENI S.p.A. Exploration and Production Division project.
    Description: Unpublished
    Description: Seattle, USA
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: restricted
    Keywords: Hydrology ; AUV ; Cinque Terre ; Ligurian Sea ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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    PAPER (OA)
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