5,561 results match your criteria: "Universita di Pisa[Affiliation]"

White shark comparison reveals a slender body for the extinct megatooth shark, (Lamniformes: Otodontidae).

Palaeontol Electronica

January 2024

Department of Biological Sciences, DePaul University, Chicago, Illinois, USA, Department of Environmental Science and Studies, DePaul University, Chicago, Illinois, USA, and Sternberg Museum of Natural History, Fort Hays State University, Hays, Kansas, USA.

Article Synopsis
  • * Understanding its biology and evolution is crucial for grasping how such predators influenced today's ocean environments, despite the inability to pinpoint its exact body shape due to incomplete fossils.
  • * Recent analysis shows that earlier estimates of the megatooth shark's body length based on existing white shark vertebrae were underestimated, suggesting that it had a more elongated body compared to modern white sharks.
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  • Essential oils (EOs) from nine Algerian plant species were hydrodistilled, analyzed, and tested for their antioxidant and antiproliferative properties.
  • EOs varied in composition; some had high terpene hydrocarbons while others were rich in oxygenated compounds, with sesquiterpenes being predominant in one EO and oxygenated monoterpenes in another.
  • Two EOs demonstrated the strongest antioxidant activity, with IC50 values as low as 0.0002 mg/mL, and one EO exhibited antiproliferative effects against breast and lung cancer cell lines.
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Magneto-Chiral Dichroism of Chiral Lanthanide Complexes in the Context of Richardson's Theory of Optical Activity.

Angew Chem Int Ed Engl

December 2024

Laboratoire National des Champs Magnétiques Intenses, CNRS, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL, F-38042, Grenoble, France.

Here we report on the Magneto-Chiral Dichroism (MChD) detected through visible and near-infrared light absorption of two enantiomeric pairs of Er and Tm chiral complexes featuring a propeller-like molecular structure. The magnetic properties show typical features of isolated paramagnetic ions associated with I and H ground state terms. MChD spectroscopy shows high g dissymmetry factors of ca.

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Characterizing smartphone capabilities for seismic and structural monitoring.

Sci Rep

October 2024

INFN-Sezione di Firenze, Dipartimento di Fisica e Astronomia e LENS, Università di Firenze, Via Sansone 1, Sesto Fiorentino, FI, 50019, Italy.

As seismic events continue to pose significant threats to urban infrastructure, leveraging smartphones equipped with accelerometers for real-time monitoring has gained prominence. To ascertain the reliability and sensitivity of smartphone-based measurements, an in-depth characterization of their response is essential. This article presents a thorough characterization of the performance of typical accelerometers installed on three distinct smartphone models.

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Spread of multidrug-resistant Pseudomonas aeruginosa strains threatens to render currently available antibiotics obsolete, with limited prospects for the development of new antibiotics. Lytic bacteriophages, the viruses of bacteria, represent a path to combat this threat. In vitro-directed evolution is traditionally applied to expand the bacteriophage host range or increase bacterial suppression in planktonic cultures.

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Article Synopsis
  • A new panel of metal-betaine-bistriflimide complexes (like Mg, Ca, Zn, Cu, and Ni) has been created with high purity and yield.
  • In addition, related metal bistriflimide salts were synthesized and analyzed using similar techniques.
  • This study is the first thorough exploration of the physical and chemical properties of these metal systems, revealing how factors like metal cations and betaine coordination influence solubility, stability, and electrochemical characteristics, which are crucial for potential applications.
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[Registers as central real world data source: the experience of the Italian Multiple Sclerosis and Related Disorders Register].

Epidemiol Prev

September 2024

Struttura Tecnico Operativa, Laboratorio di Ricerca per il Coinvolgimento dei Cittadini in Sanità, Dipartimento di Epidemiologia Medica, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milano.

Registers collecting data from clinical practice (real world data) have gained increasing interest in recent years in the scientific, administrative, and regulatory fields. The value of longitudinal data collection in deepening knowledge about a specific pathology and its healthcare complexity is increasingly recognized. This article describes the development, organizational structure, and technical characteristics of the Italian Multiple Sclerosis and Related Disorders Register (RISM).

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Chiral multiresonant thermally activated delayed fluorescence (MR-TADF) materials show great potential as emitters in circularly polarized (CP) organic light-emitting diodes (CP-OLEDs) owing to their bright and narrowband CP emission. Here, two new chiral MR-TADF emitters BuPh-BN and DPA-BuPh-BN possessing intrinsically helical chirality have been synthesized and studied. The large steric interactions between the -butylphenyl groups not only induce the helical chirality but also provide a notable configurational stability to the enantiomers.

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On-Chip Thermoelectric Devices Based on Standard Silicon Processing.

Small

December 2024

Dipartimento di Ingegneria della Informazione, Università di Pisa, Via G.Caruso, I-56122, Pisa, Italy.

The strong reduction of thermal conductivity with respect to bulk silicon makes nanostructured silicon one of the best materials for highly efficient direct conversion of heat into electrical power and vice-versa. The widespread technologies for the integration of silicon devices can be used to define on-chip micro thermoelectric generators (scavengers); similar structures could also be used for precise and well-localized cooling through the reverse process of heat pumping. However, the road to the fabrication of integrated thermal energy scavengers or cooler, based on silicon, is still very long.

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Article Synopsis
  • In the past decade, targeted kidney inhibitors (TKIs) have significantly improved the survival rates of chronic myeloid leukemia (CML) patients, particularly those achieving deep and sustained molecular response (DMR), allowing some to consider stopping treatment.
  • A study analyzed responses from 1,777 CML patients in Italy, focusing on the impact of different TKIs (imatinib, dasatinib, nilotinib) and timing of responses (3, 6, and 12 months).
  • Results showed that patients achieving certain molecular response benchmarks at 3 months were more likely to achieve DMR later, with significant differences in outcomes based on the specific TKI used.
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Nanoheteroepitaxy of Ge and SiGe on Si: role of composition and capping on quantum dot photoluminescence.

Nanotechnology

October 2024

IHP-Leibniz-Institut für innovative Mikroelektronik, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany.

We investigate the nanoheteroepitaxy (NHE) of SiGe and Ge quantum dots (QDs) grown on nanotips (NTs) substrates realized in Si(001) wafers. Due to the lattice strain compliance, enabled by the nanometric size of the tip and the limited dot/substrate interface area, which helps to reduce dot/substrate interdiffusion, the strain and SiGe composition in the QDs could be decoupled. This demonstrates a key advantage of the NHE over the Stranski-Krastanow growth mechanism.

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Late Miocene transformation of Mediterranean Sea biodiversity.

Sci Adv

September 2024

Geosciences Barcelona (GEO3BCN-CSIC), Solé i Sabarís s/n, 08028, Barcelona, Spain.

Understanding deep-time marine biodiversity change under the combined effects of climate and connectivity changes is fundamental for predicting the impacts of modern climate change in semi-enclosed seas. We quantify the Late Miocene-Early Pliocene [11.63 to 3.

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This Letter presents results from a combination of searches for Higgs boson pair production using 126-140  fb^{-1} of proton-proton collision data at sqrt[s]=13  TeV recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.

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This Letter presents the first study of the energy dependence of diboson polarization fractions in WZ→ℓνℓ^{'}ℓ^{'}(ℓ,ℓ^{'}=e,μ) production. The dataset used corresponds to an integrated luminosity of 140  fb^{-1} of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined.

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Article Synopsis
  • * They act as foundation species, creating "facilitation cascades" that help mitigate physical stress, reduce predator impacts, and improve resource availability for other species, which leads to complex and supportive community structures.
  • * Key research gaps include understanding how rhodoliths function as facilitators, the stability of these interactions over time, how species dynamics change in different environments, and their potential as climate refuges, which is essential for shaping effective marine conservation policies.
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Malignant pleural mesothelioma (MPM) is an aggressive cancer with a poor prognosis and the identification of novel druggable targets is urgently needed. In previous work, we identified 15 deregulated genes highly expressed in MPM tissues and correlated with a poor prognosis. Here, we validated these findings on an independent dataset of 211 MPM patients (EGA, EGAD00001001915) and on a panel of MPM cell lines.

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Although instantaneous interactions are unphysical, a large variety of maximum entropy statistical inference methods match the model-inferred and the empirically measured equal-time correlation functions. Focusing on collective motion of active units, this constraint is reasonable when the interaction timescale is much faster than that of the interacting units, as in starling flocks, yet it fails in a number of counterexamples, as in leukocyte coordination (where signaling proteins diffuse among two cells). Here, we relax this assumption and develop a path integral approach to maximum-entropy framework, which includes delay in signaling.

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Piezoelectric energy harvesting captures mechanical energy from a number of sources, such as vibrations, the movement of objects and bodies, impact events, and fluid flow to generate electric power. Such power can be employed to support wireless communication, electronic components, ocean monitoring, tissue engineering, and biomedical devices. A variety of self-powered piezoelectric sensors, transducers, and actuators have been produced for these applications, however approaches to enhance the piezoelectric properties of materials to increase device performance remain a challenging frontier of materials research.

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Phycobilisomes (PBs) are giant antenna supercomplexes of cyanobacteria that use phycobilin pigments to capture sunlight and transfer the collected energy to membrane-bound photosystems. In the PB core, phycobilins are bound to particular allophycocyanin (APC) proteins. Some phycobilins are thought to be terminal emitters (TEs) with red-shifted fluorescence.

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The Phenomenon of Vibrational Circular Dichroism Enhancement: A Systematic Survey of Literature Data.

J Phys Chem B

September 2024

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi 13, 56126 Pisa, Italy.

While the intensity of vibrational circular dichroism (VCD) signals is commonly 10-10 times smaller than that of corresponding IR signals, several kinds of systems display enhanced VCD spectra with -values (VCD/IR intensity ratio) above 10 and even reaching 5 × 10 in some exceptional cases. These systems include transition metal and lanthanide complexes, protein and peptide fibrils, short oligopeptide gels, crystalline compounds, gels and solution aggregates of organic compounds. We review the literature on VCD enhancement, focusing on collecting and analyzing data on enhanced -values.

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Strongly Fluorescent Blue-Emitting LaO: Bi Phosphor for Latent Fingerprint Detection.

Materials (Basel)

August 2024

Laboratory of Dielectric and Photonic Materials, Faculty of Sciences of Sfax, Sfax University, Sfax 3018, Tunisia.

Blue-emitting bismuth-doped lanthanum oxide (LaO: Bi) with various concentrations of Bi was synthesized using the sol-gel combustion method and used for visualization of latent fingerprints (LFPs). An X-ray diffraction (XRD) study revealed the hexagonal structure of the phosphors and total incorporation of the bismuth in the LaO matrix. Field Emission Scanning Electron Microscopy (FE-SEM) and Fourier Transform Infrared Spectroscopy (FTIR) were used to study the morphology and the relative vibrations of the synthesized samples.

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Olive oil coproducts and their phenolic extracts have shown beneficial effects when added to the diets of food-producing animals, whereas data on their effects on pets are scarce. The aim of this study was to evaluate the effects of dietary supplementation with olive flour (MOP) on oxidative blood biomarkers in dogs. Thirty dogs were recruited and divided into two groups.

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We present an implementation for the use of Cholesky decomposition (CD) of two-electron integrals within the spin-free Dirac-Coulomb (SFDC) scheme that enables to perform high-accuracy coupled-cluster (CC) calculations at costs almost comparable to those of their nonrelativistic counterparts. While for nonrelativistic CC calculations, atomic-orbital (AO)-based algorithms, due to their significantly reduced disk-space requirements, are the key to efficient large-scale computations, such algorithms are less advantageous in the SFDC case due to their increased computational cost in that case. Here, molecular-orbital (MO)-based algorithms exploiting the CD of the two-electron integrals allow us to reduce disk-space requirements and lead to computational cost in the CC step that is more or less the same as in the nonrelativistic case.

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Article Synopsis
  • Demand for computing power in major scientific experiments, like the CMS at CERN, is expected to significantly increase over the coming decades.
  • The implementation of coprocessors, particularly GPUs, in data processing workflows can enhance performance and efficiency, especially for machine learning tasks.
  • The Services for Optimized Network Inference on Coprocessors (SONIC) approach allows for improved use of coprocessors, demonstrating successful integration and acceleration of workflows across various environments without sacrificing throughput.
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We prove the first regularity theorem for the free boundary of solutions to shape optimization problems involving integral functionals, for which the energy of a domain is obtained as the integral of a cost function (, ) depending on the solution of a certain PDE problem on . The main feature of these functionals is that the minimality of a domain cannot be translated into a variational problem for a single (real or vector valued) state function. In this paper we focus on the case of affine cost functions , where is the solution of the PDE with Dirichlet boundary conditions.

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