Search results for " Seconda"

Metal ions modulate thermal aggregation of betalactoglobulin: a join chemical and physical characterization

2014

Abstract Molecular basis of the role played by Cu 2 + and Zn 2 + ions during the thermal aggregation processes of beta-lactoglobulin (BLG) was studied by using a joint application of different techniques. In particular, Raman spectroscopy was very useful in identifying the different effects caused by the two metals at molecular level (i.e. changes in His protonation state, disulfides bridge conformation, and micro-environment of aromatic residues), evidencing the primary importance of the protein charge distribution during the aggregation process. Both metal ions are able to act on this factor and favor the protein aggregation, but Zn 2 + is able to alter the natural conformational state of…

Study by static SIMS, XPS and UPS of the adsorption of cyanogen on (100) Ni surfaces

2000

Abstract The interaction of cyanogen with (100) Ni surfaces at room temperature was studied using secondary ion mass spectrometry in a static mode, and photoemission spectroscopies (XPS and UPS). It has been shown that cyanogen is adsorbed on this nickel surface in a dissociative mode: atomic carbon and nitrogen are present on the surface as well as CN fragments. These adsorbed species have been characterized by XPS and UPS. Increasing the temperature in the 400 K range increases the rate of the dissociation reaction of CN into atomic carbon and nitrogen. Moreover carbon is found to dissolved into the bulk for temperatures as low as 475 K. No evidence has been found of a polymerized form of…

Trace Analysis of Plutonium and Technetium by Resonance Ionization Mass Spectrometry Using an Atomic Beam and a Laser Ion Source

1990

A method for low level detection of plutonium and technetium is described with a detection limit of less than 107 atoms. Plutonium is a very toxic element due to its radioactive decay as well as its chemical behaviour. It was released to the environment in large amounts during the fifties and sixties of his century, principally by nuclear-weapon tests and some accidents. As a result about 0.4 − 4 mBq per gram 239Pu(T1/2 = 24390 y), corresponding to 4 × 108 − 4 × 109 atoms, can be found in the Northern Hemisphere in soil samples.

Promuovere la convivenza e la cittadinanza: nascita di un centro di aggregazione giovanile interculturale

2012

Il contributo descrive ed analizza i principali steps da compiere per progettare un Centro di Aggregazione Interculturale. Vengono mostrati aspetti di contenuto e procedure principali con l'illustrazione parallela di un Centro realmente esistente a Palermo. Si privilegiano aspetti pragmatici e l'idea della co-progettazione partecipata.

Quelle place pour la créativité des élèves dans les démarches d’investigation en sciences ? Réflexions théoriques et propositions méthodologiques pou…

2022

English speaking skills in Finnish upper secondary school : students' self-assessment vs. the objectives of the curriculum

2017

Vieraiden kielten osaamisella on alati kasvava merkitys nykyajan ihmisille. Eri kulttuureista ja yhteisöistä tulevat ihmiset luovat kontakteja toisiinsa niin virtuaalisesti kuin myös kasvokkain. Tällaiset kontaktit ovat mahdollisia juurikin kielten avulla, ja erityisesti englannin kieli on saavuttanut kansainvälisesti tärkeän roolin eri taustaisten ihmisten yhteisenä kommunikointivälineenä. Englannin kielen taidolla voi pärjätä lähes kaikkialla maailmassa, ja Suomessakin voi olettaa törmäävänsä englannin kielen puhumista vaativiin tilanteisiin arkipäivän elämässä. Suurin osa suomalaisista pääsee opiskelemaan englannin kieltä peruskoulussa, ja lukioon menevät nuoret jatkavat englannin opinto…

Adolescents' engagement profiles and their association with academic performance and situational engagement

2020

This study examined adolescents' engagement profiles and their association with situational engagement and academic performance in lower secondary school settings. The data consisted of 301 Grade 7 students from Finland. By utilizing person-oriented approach with Latent Profiling Analysis on subscales capturing students' overall engagement, four subgroups of students with different overall engagement profiles were identified. These profile groups were further analyzed with respect to differences in student background (gender and maternal education), academic performance (GPA, and reading and mathematics tests), and lesson-specific situational engagement. The profile groups showed difference…

Finnish Secondary Students’ Mental Models of Magnetism

2020

We examined Finnish lower secondary students’ mental models of magnetism through their drawings, written explanations and interviews. Secondary students in Finland (N=12) engaged in six lessons designed specifically to target three key concepts in understanding magnetism: structure and organization (magnetic domains), magnetic fields and magnetic interactions. We describe how, with a finite number of key concepts introduced, students reflected upon and revised their mental models of magnetism and magnetic interactions towards more sophisticated and normative scientific views. We found two new categories of students’ models: the pole model and pole/field model. The critical moments in evolvi…

Finnish Adolescent Girls’ Activity Patterns and The Effects of an Activity-Based Homework Intervention on Their Physical Activity

2021

Purpose: The insufficient physical activity (PA) of adolescents is a global challenge, and there is a need to find opportunities to engage youth in active lifestyles. The majority of adolescents do not meet the recommended guidelines of physical activity, and especially females have low levels of activity as they approach adolescence. The goal of this study was to obtain insight into Finnish adolescent girls’ objectively measured physical activity by evaluating the effects of an activity-based homework intervention on low, medium, and high-active girls during after-school hours. Method: A physical activity homework intervention was put into place for female adolescent girls. Physical activi…

From a “Student” to a Lifelong “Consumer” of Education? Constructions of Educability in Adult Students’ Narrative Life Histories

2010

The focus of this study was to examine the constructions of the educable subject of the lifelong learning (LLL) narrative in the narrative life histories of adult students at general upper secondary school for adults (GUSSA). In this study lifelong learning has been defined as a cultural narrative on education, “a system of political thinking” that is not internally consistent, but has contradictory themes embedded within it (Billig et al., 1988). As earlier research has shown and this study also confirms, the LLL narrative creates differences between those who are included and those who fall behind and are excluded from the learning society ideal. Educability expresses socially constructed…