Search results for "-n"

Structures and EPR spectra of binary sulfur−nitrogen radicals from DFT calculations

2007

he scattered electron paramagnetic resonance (EPR) spectroscopic data for binary sulfur–nitrogen (S,N) radicals have been compiled and critically assessed.Many of these are inorganic rings or cages.For each species, possible equilibrium structures in the gas phase and the EPR hyperfine coupling (hfc) constants have been calculated with DFT using the B3LYP functional and basis sets of triple-ζ (or better) quality.Good agreement is obtained between calculated and measured values for the well characterized [S3N2]+radical dot, a planar π-radical for which the s-component of the orbitals is likely to be reasonably independent of minor geometrical changes between gas-phase and condensed-phase sta…

Electrochemical and Electronic Structure Investigations of the [S3N3]• Radical and Kinetic Modeling of the [S4N4]n/[S3N3]n (n = 0, −1) Interconversion

2009

Voltammetric studies of S4N4 employing both cyclic (CV) and rotating disk (RDE) methods in CH2Cl2 at a glassy carbon electrode reveal a one-electron reduction at −1.00 V (versus ferrocene/ferrocenium), which produces a second redox couple at −0.33 V, confirmed to be the electrochemically generated [S3N3]− by CV studies on its salts. Diffusion coefficients (CH2Cl2/0.4 M [nBu4N][PF6]) estimated by RDE methods: S4N4, 1.17 × 10−5 cm2 s−1; [S3N3]−, 4.00 × 10−6 cm2 s−1. Digital simulations of the CVs detected slow rates of electron transfer for both couples and allowed for a determination of rate constants for homogeneous chemical reaction steps subsequent to electron transfer. The common paramet…

Nitrate and nitrite in the diet: How to assess their benefit and risk for human health

2015

Nitrate is a natural constituent of the human diet and an approved food additive. It can be partially converted to nitrogen monoxide, which induces vasodilation and thereby decreases blood pressure. This effect is associated with a reduced risk regarding cardiovascular disease, myocardial infarction, and stroke. Moreover, dietary nitrate has been associated with beneficial effects in patients with gastric ulcer, renal failure, or metabolic syndrome. Recent studies indicate that such beneficial health effects due to dietary nitrate may be achievable at intake levels resulting from the daily consumption of nitrate-rich vegetables. N-nitroso compounds are endogenously formed in humans. However…

L'espansione delle specie legnose esotiche negli habitat naturali e seminaturali: un problema di gestione forestale attuale

2018

Le specie esotiche invasive si diffondono soprattutto in aree antropizzate, dove riescono ad occupare spazi lasciati liberi dalle specie autoctone e dalle comunità da esse edificate. In questi ultimi anni, tuttavia, numerose specie arboree ed arbustive esotiche si stanno diffondendo in Italia, oltre che in ambienti disturbati, anche in aree naturali e semi-naturali. È questo il caso dell’ailanto (Ailanthus altissima (Mill.) Swingle), una delle specie arboree esotiche invasive più diffuse e dannose negli ecosistemi forestali temperati e mediterranei di tutto il mondo. Dal punto di vista ecologico, l’ailanto mostra tutti i caratteri tipici delle specie pioniere arboree: rapido accrescimento i…

The Influence of Nanoparticle Shape on Protein Corona Formation

2020

Nanoparticles have become an important utility in many areas of medical treatment such as targeted drug and treatment delivery as well as imaging and diagnostics. These advances require a complete understanding of nanoparticles' fate once placed in the body. Upon exposure to blood, proteins adsorb onto the nanoparticles surface and form a protein corona, which determines the particles' biological fate. This study reports on the protein corona formation from blood serum and plasma on spherical and rod‐shaped nanoparticles. These two types of mesoporous silica nanoparticles have identical chemistry, porosity, surface potential, and size in the y ‐dimension, one being a sphere and the other a …

SMART NANOSPONGE-BASED SYSTEMS FOR ADVANCED APPLICATIONS

2023

Socrate era un corruttore?

2007

Il socratico sapere di non sapere, riletto e individuato come rapporto tra piano teoretico e piano pratico (in Aristotele, Kant, Schelling)permette il rilievo di quel piano di assoluta alterità che compete propriamente alla libertà dell'uomo.

Inclusive Decision-making and Campaign: The Participation of Second Generation Migrants for Preventing Radicalization

2019

This paper deals with the analysis of the first results of Oltre project (ISF - DG Migration and Home Affairs, EU) funding for preventing the radicalization of the second-generation of migrants. The non-standard field research was intertwined with online social network profiles investigation. We present the off-line research results. Starting from the different dimensions of the risk of radicalization proposed by the kaleidoscopic overview of risk factors (Sieckelinck and Gielen 2018: 5; Ranstorp 2016), we created a topic guide for the indepth qualitative interviews collecting 42 interviews of 2G youths (18-30 years) in 7 Italian towns, interviewing also several privileged testimonies. Then…

Invasive Northern red oaks benefit temnothorax crassispinus (Hymenoptera: Formicidae) ant colonies

2018

Non-native plant species can modify their environment, and their influence on food chains is well recognized. How ever, the phenomenon of non-nutrient dependent interaction between non-native plants and native animals has received little attention to date. The Northern Red Oak (Quercus rubra) is a non-native, invasive tree species in Europe, which strongly negatively influences co-occurring plants. However, a part of the native fauna is able to utilize the resources offered by this species in its non-native range. We studied a common species of wood ant, Temnothorax crassispinus, in forests under canopies of non-native Northern Red Oak and native oaks, Pedunculate Oak (Q. robur), and Sessil…

The effects of grazing history, soil properties and stand structure on the communities of saprotrophic fungi in wood-pastures

2022

Wood-pastures are threatened anthropogenic biotopes that provide habitat for an extensive group of species. Here we studied the effect of management, grazing intensity, time since abandonment, historical land-use intensity, soil properties and stand conditions on communities of saprotrophic fungi in wood-pastures in Central Finland. We found that the proportion of broadleaved trees and soil pH are the major drivers in the communities of saprotrophic fungi in these boreal wood-pastures. In addition, tree species richness, soil moisture, historical land-use intensity and time since abandonment affected the communities of saprotrophic fungi. Current management or grazing intensity did not have…