196,463 research outputs found
Virginia Predieri, maestra di scuola dell'infanzia nella Bologna del secondo dopoguerra
No full textIl saggio rientra all'interno del volume 'Dalla parte delle maestre. La stagione pedagogica di Virginia Predieri (1931-2009)' e ripercorre le vicende di Virginia Predieri, maestra di scuola dell’infanzia nel Comune di Bologna nel secondo dopoguerra, nata durante il fascismo e immersa nella stagione della ricostruzione postbellica e della scuola nell’Italia repubblicana. In questo specifico contributo, sulla base di fonti d'archivio finora inesplorate e della documentazione personale della maestra conservata dalla famiglia, si delinea il contesto storico, politico e pedagogico in cui ella si è formata ed ha operato, la politica scolastica del Comune di Bologna in cui si colloca la microstoria di Virginia Predieri, con maggiore attenzione agli anni della presenza di Bruno Ciari, con il quale ha collaborato strettamente, in una straordinaria ed innovativa stagione pedagogica e didattica, ancora poco nota sul piano operativo interno alla didattica nella scuola
Istituzioni, mercato e democrazia: liber amicorum per gli ottanta anni di Alberto Predieri
No full textUn'opera che rappresenta un tributo alla figura di Alberto Predieri, intellettuale e studioso impegnato nel progresso delle istituzioni e nella effettività del disegno e delle garanzie costituzionali. Trentacinque saggi su istituzioni, mercato e democrazia, ad opera di autori a lui legati da debiti di riconoscenza intellettuale, morale e professionale, raccolti in occasione dei suoi ottant'anni
Le ragioni del volume
No full textIl saggio illustra le ragioni storiografiche da cui è scaturito il volume 'Dalla parte delle maestre. La stagione pedagogica di Virginia Predieri (1931-2009)', che ripercorre le vicende di Virginia Predieri, maestra di scuola dell’infanzia nel Comune di Bologna nel secondo dopoguerra, nata durante il fascismo e immersa nella stagione della ricostruzione postbellica e della scuola nell’Italia repubblicana, maestra poi collaboratrice di Bruno Ciari. Oltre alle questioni storiografiche il saggio motiva le ragioni dell'intero volume sul piano del recupero della memoria scolastica collettiva, nel quadro della valorizzazione del patrimonio educativo e scolastico del passato, a cui le biografie magistrali possono contribuire
Metal chelates of 2-hydroxy-4-methylthiobutanoic acid in animal feeding: characterization, in vitro and in vivo investigations.
No full textMetal chelates of 2-hydroxy-4-methylthiobutanoic acid in animal feeding: characterization, in vitro and in vivo investigations
Giacomo Biagi,a Enrico Cinti,b Simonetta Ferruzza,c Attilio L. Mordenti,a Giovanni Predieri,d Matteo Tegonid
aDIMORFIPA, University of Bologna, Via Tolara di Sopra 50, Ozzano Emilia, Italy; bAgristudio S.r.l., Via Gramsci 56, Reggio Emilia, Italy; cINRAN, Nutrition National Institute, Via Ardeatina 546, Roma; aGIAF Chemistry Department, University of Parma, Parco delle Scienze, Parma, Italy
Interest in using alternative mineral sources, particularly those chelated with proteins or aminoacids, has recently increased due to their reported higher availability compared to conventional (inorganic) sources [1]. For example, it has been found that ruminants respond (increased growth, milk production etc.) to certain trace mineral complexes or chelates [2] and that aminoacid chelates show a higher availability than the inorganic compounds when fed to rainbow trouts, even in presence of phosphates and phytates [3]. However, there are still contentions both regarding improved bio-availability and integrity of metal chelates at the low pH of the first digestive tract. This important drawback can be overcome by using a chelating ligand able to improve the stability of chelates at low pH values. Preliminary results of our investigations [4] indicate that 2-hydroxy-4-methylthiobutanoic acid (MHA; the so-called methionine hydroxy-analogue), an alpha-hydroxyacid largely used in animal nutrition as a source of methionine has the requested features. It forms bis-chelate complexes of formula [{CH3SCH2CH2CH(OH)COO}2M].nH2O (M = Ca2+, Mg2+, Mn2+, Fe2+, Co2+, Cu2+ or Zn2+). Potentiometric investigations for the copper(II), zinc(II) and iron(III) MHA chelates in solution show that these species, differently from AA chelates, are rather stable even at low pH values. In the case of iron, the distribution diagram of the system Fe3+/MHA does not show any trace of free iron cations at pH > 2.5. Furthermore, in order to gain insight about biavailability of MHA chelates, in vitro and in vivo investigations were performed. In the in vitro studies, human intestinal Caco-2 cells were exposed to Fe3+/MHA chelate solutions. The iron/MHA chelate did not alter the permeability of Caco-2 tight junctions and was taken up to a larger extent than the reference iron chelated with nitrilotriacetic acid. In vivo investigations were carried out in the rat. After receiving a zinc-deficient diet for 3 weeks, animals were fed the same diet added with zinc sulfate or zinc/MHA chelate; the zinc content of faeces was higher (+ 45%; P < 0.05) in sulfate fed rats, whereas zinc retention was higher (+ 61%; P < 0.05) in the Zn/MHA diet.
References
[1] Ashmead, H.D., 1992, The Roles of AA Chelates in Animal Nutrition, Moyes Publ., Park Ridge, NJ. [2] Spears, J.W., 1996, Anim. Feed Sci. Technol., 58, 151-163. [3] Satoh, S. et al., 2003, Aquacult., 225, 431-444. [4] Predieri, G. et al., 2003, J. Inorg. Biochem., 95, 221-224
Disturbances of acid-base balance in cirrhosis: a neglected issue warranting further insights.
No full textSilica-supported bismuth molybdate catalysts obtained by the sol-gel process via silicon alkoxides
No full textInterior Color and Psychological Functioning in a University Residence Hall
No full textThe research exploited a unique architectural setting of a university residence hall composed by six separate buildings that matched for every architectural detail and differed only for the interior color (violet, blue, green, yellow, orange, and red). Four hundred and forty-three students living in the six buildings for an average of 13.33 months participated in a study that assessed color preference (hue and lightness), lightness preference, and the effects of color on studying and mood. The results showed a preference for blue interiors, followed by green, violet, orange, yellow, and red. A preference bias was found for the specific color in which the student lived. Gender differences emerged for the preference of blue and violet. Room-lightness was significantly affected by the interior color. Room ceiling was preferred white. Blue as interior color was considered to facilitate studying activity. The use of differentiated colors in the six buildings was evaluated to significantly facilitate orienting and wayfinding. A significant relation was found between a calm mood and preference for blue
Liquid-liquid extraction and determination of uranium (VI) with 2,6-diacetylpyridine bis(benzohylhydrazone)
No full text2,6-Diacetylpyridine bis(benzoylhydrazone) (H2DPBH) is proposed as a ligand for the extraction of uranium(VI). Complete extraction from aqueous solutions into dichloromethane is achieved with a ligand/metal mole ratio of < for 10-5-10-4 M uranyl ion. Potentiometric measurements indicate that the extracted species is UO2 (DPBH). Uranium can be determined in the extract by spectrophotometric measurements at 420 nm and by differentail pulse polarography (Ep = -0.67 V) with tetraethylammonium bromide as supporting electrolyte. For both methods, the detection limit is about 2 × 10-6 M in the extract. © 1986
Pharmacological Treatment of Obesity in Children and Adolescents: Present and Future
No full textThe prevalence of overweight and obesity is increasing in children and adolescents worldwide raising the question on the approach to this condition because of the potential morbidity, mortality, and economic tolls. Dietetic and behavioral treatments alone have only limited success; consequently, discussion on strategies for treating childhood and adolescent obesity has been promoted. Considering that our knowledge on the physiological systems regulating food intake and body weight is considerably increased, many studies have underlined the scientific and clinical relevance of potential treatments based on management of peripheral or central neuropeptides signals by drugs. In this paper, we analyze the data on the currently approved obesity pharmacological treatment suggesting the new potential drugs
- …
