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Search Results: 1 - 10 of 4057 matches for " Alessandra Fiorentini "
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Circadian rhythm of the autonomic nervous system in insulin resistant subjects with normoglycemia, impaired fasting glycemia, impaired glucose tolerance, type 2 diabetes mellitus
Antonio Perciaccante, Alessandra Fiorentini, Alberto Paris, Pietro Serra, Luigi Tubani
BMC Cardiovascular Disorders , 2006, DOI: 10.1186/1471-2261-6-19
Abstract: Eighty Caucasian insulin resistant subjects (IR) and twenty five control subjects were recruited for the study. IR subjects were divided into four groups according to the outcoming results of oral glucose tests (OGTTs): IR subjects with normal glucose regulation (NGR), IR subjects with impaired fasting glycemia (IFG), IR subjects with impaired glucose tolerance (IGT) and subjects with type 2 diabetes mellitus (DM). Autonomic nervous activity was studied by 24-hours ECG recording. Heart rate variability analysis was performed in time and frequency domains: SDNN, RMS-SD, low frequency (LF) and high frequency (HF) were calculated.The total SDNN showed statistically significant reduction in all four groups with insulin resistant subjects (IR) when compared to the control group (p <0,001). During night LF normalized units (n.u.) were found to be higher in all four groups including IR subjects than in the control group (all p < 0,001) and subjects with normal glucose regulation (NGR), with impaired fasting glycemia (IFG) and with impaired glucose tolerance (IGT) were found to have higher LF n.u. than those in the type 2 diabetes mellitus group. The linear regression model demonstrated direct association between LF values and the homeostasis model assessment-index (HOMA-I), in the insulin resistant group (r = 0,715, p <0,0001).The results of our study suggest that insulin resistance might cause global autonomic dysfunction which increases along with worsening glucose metabolic impairment. The analysis of sympathetic and parasympathetic components and the sympathovagal balance demonstrated an association between insulin resistance and sympathetic over-activity, especially during night. The results indicated that the sympathetic over-activity is directly correlated to the grade of insulin resistance calculated according to the HOMA-I. Since increased sympathetic activity is related to major cardiovascular accidents, early diagnosis of all insulin resistant patients should be
QTc interval prolongation in HIV-infected patients: a case–control study by 24-hour Holter ECG recording
Fiorentini Alessandra,Petrosillo Nicola,Di Stefano Angelo,Cicalini Stefania
BMC Cardiovascular Disorders , 2012, DOI: 10.1186/1471-2261-12-124
Abstract: Background Aim of the study was to assess QTc interval by a 24-hour ECG recording in a group of HIV-infected individuals with a basal prolonged QTc. The risk factors associated with QTc prolongation and the indices of cardiovascular autonomic control were also evaluated. Methods A case–control study was performed using as cases 32 HIV-infected patients with prolonged (>440 msec) QTc interval as assessed by Holter ECG, and as controls 64 HIV-infected subjects with normal QTc interval. Autonomic function was evaluated by heart rate variability analysis during 24-hour recording. Results Duration of HIV disease was significantly longer among cases than among controls (p=0.04). Waist/hip ratio was also higher among cases than among controls (p=0.05). Frequency domain analysis showed the absence of physiologic decrease of low frequency (LF) in the night period in both cases and controls. The LF night in cases showed a statistically significant reduction when compared with controls (p=0.007). Conclusions In our study group, QTc interval prolongation was associated with a longer duration of HIV infection and with a greater waist/hip ratio. HIV patients with QTc interval prolongation and with a longer duration of HIV infection were more likely to have an impairment of parasympathetic and sympathetic cardiac component.
Mobilità umana e qualità dell'informazione: il ruolo dei centri di documentazione
Barbara Fiorentini
m@gm@ , 2003,
Abstract: In tema di interculturalità e di mobilità umana in Italia si stanno diffondendo numerosi centro di documentazione. In genere si tratta di strutture di supporto ad enti o associazioni che già operano nel settore e che necessitano di strumenti di informazione e di formazione ... Quindi un Centro di documentazione dedicato all'interculturalità e alla mobilità umana si profila non come un semplice deposito di notizie, bensì un Centro in grado di trasformare informazioni, spesso parziali, in materiali organicamente ricomposti e più facilmente leggibili. Inoltre dovrebbe proporsi di fornire un efficiente e aggiornato servizio divulgativo e di promuovere uno spazio di studio e di lavoro.
Formazione e nuove tecnologie: la formazione a distanza
Barbara Fiorentini
m@gm@ , 2003,
Abstract: Per formazione a distanza (FAD) si intendono tutti gli ambienti educativi in cui i momenti dell'insegnamento e dell'apprendimento sono spazialmente e/o temporalmente separati ed in cui il processo formativo prevede servizi di supporto all'apprendimento. La storia della FAD segue l'evoluzione delle tecnologie di comunicazione, partendo dai corsi per corrispondenza, passando per l'emissione televisiva e arrivando alle più recenti strutture di teleconferenza satellitare. Infatti la reale innovazione nel campo della FAD avviene con l'introduzione delle reti telematiche e di internet. L'insegnamento a distanza on line permette e stimola l'interazione e la collaborazione tra i partecipanti. La FAD in rete condivide con la formazione tradizionale l'interazione di gruppo, con il vantaggio della libertà da vincoli temporali e spaziali.
A Pesquisa e as Práticas de Forma o de Professores de Matemática em face das Políticas Públicas no Brasil Research and Practices on Mathematics Teacher Education in face of the Public Policies in Brazil
Dario Fiorentini
Bolema: Boletim de Educa??o Matemática , 2008,
Abstract: Este artigo pretende p r em evidência algumas políticas públicas brasileiras no campo da educa o e analisar os desdobramentos e impactos das mesmas sobre cursos, programas e processos de forma o de professores que ensinam matemática. O foco da análise incide principalmente sobre os cursos de licenciatura e pedagogia, os cursos emergenciais de forma o em servi o, os processos de sele o de professores para o ensino público e alguns programas de forma o continuada de professores. Para desenvolver a análise s o tomados como referência alguns estudos brasileiros que tematizam as políticas públicas educacionais no Brasil engendradas sob um regime de política econ mica neo-liberal e algumas pesquisas desenvolvidas pelo Grupo de Estudo e Pesquisa sobre Forma o de Professores de Matemática (GEPFPM) da FE/Unicamp. O artigo conclui sobre a necessidade da SBEM mobilizar a comunidade de educadores matemáticos, tentando estabelecer parcerias com outras entidades científicas e institui es congêneres, de modo a participar e intervir com responsabilidade e compromisso na concep o e gest o das políticas educacionais do Brasil. Palavras-chave: Forma o de Professores de Matemática. Políticas Públicas. Políticas Educacionais. Licenciatura em Matemática. Forma o em Servi o de Professores. This paper intends to highlight some Brazilian public policies in the field of education and analyze their impact on courses, programs and processes of mathematics teacher education. The analysis focuses mainly on: teaching degree courses; in-service education courses; teachers’ selection processes for public teaching; and some continuing education programs for teachers. To develop this analysis, some Brazilian studies that deal with educational public policies in Brazil are used as references. These policies are engendered under a regime of neo-liberal economic policies. Some research developed by the Study & Research Group on Mathematics Teacher Education (GEPFPM) of FE/Unicamp is also used as reference. This paper ends highlighting the need of SBEM to mobilize the mathematics educators community to establish partnerships with other scientific entities and similar institutions, aiming at participating and intervening in the conception and administration of public education policies in our country with responsibility and commitment. Keywords: Mathematics Teacher Education. Public Policies. Educational Policies. Preservice Teacher Education. In-service Teacher Education.
Nuclear astrophysics and neutrinos
G. Fiorentini
Physics , 1998,
Abstract: In this report, centered on the activities within the MURST-PRIN project "Fisica teorica del nucleo e dei sistemi a pi\`u corpi" we discuss recent advances on the following items: i)neutrinos as probes of the solar interior and of other astrophysical objects; ii)neutrinos as probes of physics beyond the Standard Model of electroweak interactions; iii)the role of nuclear physics in i) and ii); iv) who is doing what within the italian network; v)future projects.
Origin of the efficient light emission from inversion domain boundaries in GaN
V. Fiorentini
Physics , 2002, DOI: 10.1063/1.1554776
Abstract: Intentionally-produced inversion domain boundaries in GaN have been reported to be highly efficient recombination centers. Here I report a rationale for this phenomenon based on ab initio density-functional calculations. I also propose a model, based on the existence of polarization in GaN, of the observation that a domain boundary acts as a rectifying junction under voltage applied between the two opposite-polarity surfaces.
Conceitos de arquitetura manutente e de arquitetura voltária
Jarbas Karman,Domingos Fiorentini
Exacta , 2006,
Abstract: To situate, with property, the nosocomial architecture, so that we can differ it from the other architectures, we use the concepts of manutente (unalterable, immutable) and voltária (mutable, fickle) architectures, developed by the authors. Whereas manutente refers to a finished, enduring architecture, which stands stable over the years, basically like in its original project, voltária refers to an unfinished, provisory, dynamic, mutable architecture. Each one of this concepts congregates characteristics which are peculiar and inherent to them; with regard to the medical care establishments, so that they survive and endure efficaciously, they must be provided, beforehand, since their creation, of provisory means and resources which assure the flexibility and the necessary resources to keep them up-to-dated and in conditions to contrapose the physical and functional obsolescence omnipresent in health institutions. The nosocomial architecture disposes of basic requirements that confers to the draftsman the necessary tools to provide the required functionality and competitiveness to the health institutions. Flexibility is one of them. The text focuses some of its aspects and illustrates some of the practical applications.
Solar neutrinos (almost) without standard solar models
G. Fiorentini,B. Ricci
Physics , 1995,
Abstract: We extract information on the fluxes of Be and CNO neutrinos directly from solar neutrino experiments, with minimal assumptions about solar models. Next we compare these results with solar models, both standard and non standard ones. Finally we discuss the expectations for Borexino, both in the case of standard and non standard neutrinos.
Extracting convergent surface energies from slab calculations
V. Fiorentini,M. Methfessel
Physics , 1996, DOI: 10.1088/0953-8984/8/36/005
Abstract: The formation energy of a solid surface can be extracted from slab calculations if the bulk energy per atom is known. It has been pointed out previously that the resulting surface energy will diverge with slab thickness if the bulk energy is in error, in the context of calculations which used different methods to study the bulk and slab systems. We show here that this result is equally relevant for state-of-the-art computational methods which carefully treat bulk and slab systems in the same way. Here we compare different approaches, and present a solution to the problem that eliminates the divergence and leads to rapidly convergent and accurate surface energies.
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