11,219 results match your criteria: "Universita' di Roma[Affiliation]"

Global Distribution of Alien Mammals Under Climate Change.

Glob Chang Biol

November 2024

Global Mammal Assessment Programme, Dipartimento di Biologia e Biotecnologie "Charles Darwin", Sapienza Università di Roma, Rome, Italy.

The recent thematic Assessment Report on Invasive Alien Species and their Control of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services reaffirmed biological invasions as a major threat to biodiversity. Anticipating biological invasions is crucial for avoiding their ecological and socio-economic impacts, particularly as climate change may provide new opportunities for the establishment and spread of alien species. However, no studies have combined assessments of suitability and dispersal to evaluate the invasion by key taxonomic groups, such as mammals.

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In this work, the first phytochemical analysis ever performed on a whole cone of Hook. is presented. This was carried out by means of column chromatography, NMR spectroscopy and MS spectrometry on the female cone, evidencing the presence of forty metabolites, thirty-three of which are primary whilst the remaining are non-volatile secondary.

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Ion beam therapy techniques have advanced significantly in the past two decades. However, the development of dosimetric verification methods has lagged. Traditional dosimetry, which offers a macroscopic view of the absorbed dose, fails to address the micrometric-scale stochastic effects crucial for understanding biological responses.

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The hydration properties of the Pb ion in aqueous solution have been investigated by using a synergic approach based on Classical and Car-Parrinello molecular dynamics (CPMD) simulations and extended X-ray absorption fine structure (EXAFS) spectroscopy. A definite answer has been given to the main question on the Pb hydration structure, which concerns the formation of either holodirected or hemidirected solvation geometries, such terms referring to the arrangements of the ligands that can be directed either throughout the surface of an encompassing globe around Pb or throughout only part of the globe, respectively. Our CPMD results show that the Pb ion in water forms a hemidirected 4-fold cluster with a well-defined distorted pyramidal geometry.

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X-ray phase-contrast imaging of strong shocks on OMEGA EP.

Rev Sci Instrum

November 2024

York Plasma Institute, School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom.

The ongoing improvement in laser technology and target fabrication is opening new possibilities for diagnostic development. An example is x-ray phase-contrast imaging (XPCI), which serves as an advanced x-ray imaging diagnostic in laser-driven experiments. In this work, we present the results of the XPCI platform that was developed at the OMEGA EP Laser-Facility to study multi-Mbar single and double shocks produced using a kilojoule laser driver.

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Facing healthy and pathological aging: A systematic review of fMRI task-based studies to understand the neural mechanisms of cognitive reserve.

Brain Cogn

December 2024

Neuroscience and Society Laboratory, Neuroscience Area, SISSA, 34136 Trieste, Italy; Dipartimento di Medicina dei Sistemi, Università di Roma - Tor Vergata, Roma, Italy.

Cognitive reserve (CR) explains the varying trajectories of cognitive decline in healthy and pathological ageing. CR is often operationalized in terms of socio-behavioural proxies that modulate cognitive performance. Individuals with higher CR are known to maintain better cognitive functions, but evidence on the underlying brain activity remains scattered.

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The identification of a charophyte population found in a rice field in Ferrara, North Italy, collected in 1999 and initially identified as , has been reevaluated. Detailed morphological observations here reported have suggested that the specimen displays characteristics more akin to , particularly in the structure of its bicellular dactyls and axillary heads. Additional examinations, including scanning electron microscopy (SEM) of oospores and analyses of herbarium specimens-encompassing original materials of , f.

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Conformational Geometry Matters: The Case of the Low-Melting-Point Systems of Tetrabutylammonium Triflate with Fumaric or Maleic Acid.

Molecules

October 2024

Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, UOS La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.

For this article, the interaction of tetrabutylammonium trifluoromethanesulfonate (TBATFO) with either fumaric (FUM) or maleic (MAL) acid has been investigated. These acids are isomers and can be considered the trans and cis configurations of the same molecular geometry. When TBATFO is mixed with FUM, an eutectic point is obtained for a relative composition of 90-10 (molar ratio), with a melting point of ≈90 °C.

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This study advances the understanding of risk and protective factors in trajectories of conduct problems in adolescence in seven countries that differ widely on a number of sociodemographic factors as well as norms related to adolescent behavior. Youth- and parent-report data from 988 adolescents in seven countries (Colombia, Italy, Kenya, Philippines, Sweden, Thailand, and the USA) who were followed longitudinally from ages 10 to 18 (yielding 6872 total data points) were subject to latent class growth analysis. A 4-class model provided the best fit to the data: Late Starters, Alcohol Experimenters, Mid-Adolescent Starters, and Pervasive Risk Takers.

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Article Synopsis
  • The study focuses on five species of Phortica flies in Europe and the Middle East, particularly Phortica variegata and Phortica okadai, known as vectors for the zoonotic eyeworm Thelazia callipaeda, in a region near Rome, Italy.
  • Over three years (2018-2020), researchers collected and identified nearly 5,600 flies, revealing a dominance of Phortica variegata, which was found to be infected with T. callipaeda, while Phortica oldenbergi showed differing behavior in fruit traps.
  • Environmental factors like temperature, wind speed, and pressure influenced the population dynamics of these species, with the study being the first to explore these ecological interactions
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The endoplasmic reticulum-associated degradation (ERAD) system eliminates misfolded and short-lived proteins to maintain physiological homeostasis in the cell. We have previously reported that ERAD is involved in salt tolerance in Arabidopsis. Given the central role of the phytohormone abscisic acid (ABA) in plant stress responses, we sought to identify potential intersections between the ABA and the ERAD pathways in plant stress response.

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Objective: Patients with diffuse cutaneous systemic sclerosis (dcSSc) frequently show spontaneous improvement of skin fibrosis. Our aim was to examine whether an improvement in skin fibrosis predicts lower likelihood of visceral organ progression and better survival.

Methods: Patients from the European Scleroderma Trials and Research (EUSTAR) cohort with dcSSc, baseline modified Rodnan skin score (mRSS) ≥7, and valid mRSS at 12±3 months follow up were included.

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A search for the exclusive hadronic decays W^{±}→π^{±}γ, W^{±}→K^{±}γ, and W^{±}→ρ^{±}γ is performed using up to 140  fb^{-1} of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of sqrt[s]=13  TeV. If observed, these rare processes would provide a unique test bench for the quantum chromodynamics factorization formalism used to calculate cross sections at colliders. Additionally, at future colliders, these decays could offer a new way to measure the W boson mass through fully reconstructed decay products.

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The first search for the Z boson decay to ττμμ at the CERN LHC is presented, based on data collected by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138  fb^{-1}. The data are compatible with the predicted background. For the first time, an upper limit at the 95% confidence level of 6.

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Article Synopsis
  • - The ATLAS experiment at the LHC conducted a search for long-lived particles (LLPs) using a large dataset (140 fb^{-1}) from proton-proton collisions at 13 TeV, focusing on LLPs with masses from 5 to 55 GeV that decay within the inner detector.
  • - The study considered scenarios where LLPs are produced from exotic Higgs boson decays and models involving axionlike particles (ALPs).
  • - No significant findings above expected background levels were detected, leading to the establishment of upper limits on various production rates involving the Higgs boson and the top quark related to LLPs and ALPs.
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The CYGNO experiment aims to build a large ( m ) directional detector for rare event searches, such as nuclear recoils (NRs) induced by dark matter (DM), such as weakly interactive massive particles (WIMPs). The detector concept comprises a time projection chamber (TPC), filled with a He:CF 60/40 scintillating gas mixture at room temperature and atmospheric pressure, equipped with an amplification stage made of a stack of three gas electron multipliers (GEMs) which are coupled to an optical readout. The latter consists in scientific CMOS (sCMOS) cameras and photomultipliers tubes (PMTs).

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Experimental and Modelling Study of Controlled Release from Dextran-Based Cryogels.

Pharmaceutics

September 2024

Dipartimento di Ingegneria Chimica, Materiali e Ambiente, Sapienza Univerisità di Roma, 00184 Rome, Italy.

In this work, five different dextran-based cryogels for controlled drug release are investigated. Vitamin B12 was used as a model drug for in vitro release tests. Two different drug-loading procedures were adopted, leading to very different drug release curves.

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Introduction: Metastatic prostate cancer (PCa) presents a significant challenge in oncology due to its high mortality rate and the absence of effective biomarkers for predicting patient outcomes. Building on previous research that highlighted the critical role of the long noncoding RNA (lncRNA) H19 and cell adhesion molecules in promoting tumor progression under hypoxia and estrogen stimulation, this study aimed to assess the potential of these components as prognostic biomarkers for PCa at the biopsy stage.

Methods: This research utilized immunohistochemistry and droplet digital PCR to analyze formalin-fixed paraffin-embedded (FFPE) biopsies, focusing on specific markers within the H19/cell adhesion molecules pathway.

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Technological innovation and Industry 5.0 are gaining increasing attention among researchers as they offer companies a significant competitive advantage. On the other hand, introducing these technologies also brings new risks for workers.

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Hepatitis E Virus Infection in Patients with Systemic and Cutaneous Lupus Erythematosus.

Int J Mol Sci

October 2024

Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy.

Systemic lupus erythematosus (SLE) is a chronic autoimmune disease characterized by a multifactorial etiology in which genetic and environmental factors interplay. An exclusively cutaneous condition has been described and defined as cutaneous lupus erythematosus (CLE). In Italy, a nationwide blood donor survey found an overall HEV prevalence of 8.

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Double-pentagon silicon chains in a quasi-1D Si/Ag(001) surface alloy.

Nat Commun

October 2024

CNR-Istituto di Struttura della Materia (CNR-ISM), Rome, Italy.

Silicon surface alloys and silicide nanolayers are highly important as contact materials in integrated circuit devices. Here we demonstrate that the submonolayer Si/Ag(001) surface reconstruction, reported to exhibit interesting topological properties, comprises a quasi-one-dimensional Si-Ag surface alloy based on chains of planar double-pentagon Si moieties. This geometry is determined using a combination of density functional theory calculations, scanning tunnelling microscopy, and grazing incidence x-ray diffraction simulations, and yields an electronic structure in excellent agreement with photoemission measurements.

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The 8th international symposium on sourdough - "Sourdough for health".

Int J Food Microbiol

January 2025

Faculty of Science and Technology, Free University of Bolzano, Piazza Università, 3, 39100 Bolzano, Italy. Electronic address:

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We consider a gas of bosons interacting through a hard-sphere potential with radius in the thermodynamic limit. We derive an upper bound for the ground state energy per particle at low density. Our bound captures the leading term and shows that corrections are smaller than , for a sufficiently large constant .

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