Nuovo realismo e metodi di ricerca misti

Il nuovo realismo ha evidenziato i limiti del costruttivismo sociale e del cosiddetto \uabpensiero debole\ubb, che rischia di sfociare nel nichilismo. Sono stati recentemente rimossi dei pregiudizi che impedivano di cogliere la realt\ue0 dei fatti educativi nella sua concreta evidenza. Tuttavia un\u2019apertura alla prospettiva metafisica offrirebbe al nuovo realismo ulteriori spazi epistemologici. In tale senso il contributo del realismo critico potrebbe aiutare a superare l\u2019artificiosa antinomia tra il ruolo attivo del soggetto conoscente e la rilevazione oggettiva dei fatti educativi. Se si realizzasse questa apertura la conoscenza scientifica e la conoscenza corrente non sarebbero pi\uf9 viste come antinomiche perch\ue9 la seconda costituirebbe un approfondimento della prima, in una linea di continuit\ue0. I metodi sperimentali di ricerca in campo educativo si sono recentemente avvalsi delle riflessioni filosofiche dei realisti per integrare l\u2019approccio qualitativo e quello quantitativo allo studio della realt\ue0 dell\u2019educazione. Anche i nuovi disegni di ricerca che intendono seguire e rilevare, senza ingabbiarli, i processi educativi sono per lo pi\uf9 misti.\uabNew Realism\ubb has highlighted the limits of social constructivism and of so-called \uabweak thought\ubb that risks producing nihilism. Some prejudices have recently been removed that prevented researchers and theorists from grasping the real core of educational facts in their concrete evidence. However, an opening to a metaphysical view would offer \uabnew realism\ubb further epistemological perspectives. In this sense, the contribution of critical realism might help to overcome the artificial antinomy between the active role of the knowing subject and the objective measurement of educational facts. With this \uabopening\ubb, scientific knowledge and current knowledge would no longer be seen as opposites because the latter would be considered as a deepening of the former, in a line of continuity. The experimental methods of research in the education field have recently made use of the philosophical reflections of realists to integrate the quantitative and qualitative approach to the study of education. New research designs, aimed at monitoring and observing educational processes, without \uabencaging\ubb them, are mainly of a \uabmixed\ubb kind

Educación personalizada y formación del carácter

En el presente artículo se sostiene que el conocimiento de la caracteriología permite al educador utilizar las tendencias naturales de los jóvenes para orientar su crecimiento como personas, ampliar los márgenes de su educabilidad, y servir de base a la personalización de la enseñanza, porque permite diversificar las intervenciones educativas en función de las características de los alumnos. Seguidamente, se proponen nuevamente las aportaciones de la caracteriología de Heymans y Le Senne desde una óptica educativo-metodológica; se analizan los distintos significados de los términos “temperamento”, “carácter” y “personalidad”; se presentan los principios fundamentales para poder determinar el temperamento de los alumnos, y se aborda la educación del carácter, fundamentalmente, como una educación en la virtud

Assessing Metacomprehension and Metacognitive Reading Strategies

The aim of the study was to establish the similarities and differences among existing instruments for measuring metacognition, in particular the awareness of reading comprehension and further to construct an original instrument for measuring features of metacognition, henceforth referred to as the Metacomprehension and Metacognitive Reading Strategies (M&MRS) Inventory. The M&MRS Inventory was distributed to 115 students at University of Palermo. The results revealed a good reliabilit

Ovarian reserve markers to identify poor responders in the context of poseidon classification

It is well-known that poor ovarian reserve is a cause of infertility, poor response to gonadotrophin stimulation and poor success rate after in vitro fertilization (IVF) cycles. Some years ago a consensus was elaborated on precise criteria which can lead to a correct identification of poor responders (the Bologna criteria). More recently, the POSEIDON group has proposed a new stratified classification of patients with low prognosis, also with the aim of providing clinical indications for the management of these patients. A literature search was carried out for studies that investigated the ability of ovarian reserve markers, in particular AMH and AFC, to predict poor ovarian response in IVF cycles; secondly, studies regarding the Bologna criteria and their prognostic value were analyzed and available literature on POSEIDON classification was reported. The most recent markers of ovarian reserve (serum AMH and ultrasound AFC) have shown to provide a direct and accurate measurement of ovarian follicle pool. These markers have generally shown comparable predictive power for ovarian response and a number of retrieved oocytes in IVF cycles. \u201cAbnormal ovarian reserve test\u201d is a very important parameter both in the Bologna criteria and in the POSEIDON classification. Several studies have already been published about the reproductive outcome of patients defined as poor responders according to the ESHRE Bologna criteria: all of them agree on the poor IVF outcome and low pregnancy rate of these patients. Instead, being the POSEIDON classification of very recent publication, the efficacy of the POSEIDON approach in improving management and outcomes of POR patients has yet to be tested and validated with future prospective clinical trials. Prediction of poor response may help clinicians choose the stimulation protocol with the aim of gaining patient compliance and cost reduction, and many efforts have been made by researchers in this sense, including the formulation of the Bologna criteria and of the POSEIDON classification, in which the ovarian reserve markers (AMH and AFC) play a fundamental role

Genetic and morphological studies of Trichosirocalus species introduced to North America, Australia and New Zealand for the biological control of thistles

Trichosirocalus horridus sensu lato has been used as a biological control agent of several invasive thistles (Carduus spp., Cirsium spp. and Onopordum spp.) since 1974. It has been recognized as a single species until 2002, when it was split into three species based on morphological characters: T. horridus, Trichosirocalus briesei and Trichosirocalus mortadelo, each purported to have different host plants. Because of this taxonomic change, uncertainty exists as to which species were released in various countries; furthermore, there appears to be some exceptions to the purported host plants of some of these species. To resolve these questions, we conducted an integrative taxonomic study of the T. horridus species complex using molecular genetic and morphological analyses of specimens from three continents. Both mitochondrial cytochrome c oxidase subunit I and nuclear elongation factor 1α markers clearly indicate that there are only two distinct species, T. horridus and T. briesei. Molecular evidence, morphological analysis and host plant associations support the synonymy of T. horridus (Panzer, 1801) and T. mortadelo Alonso-Zarazaga & Sánchez-Ruiz, 2002. We determine that T. horridus has been established in Canada, USA, New Zealand and Australia and that T. briesei is established in Australia. The former species was collected from Carduus, Cirsium and Onopordum spp. in the field, whereas the latter appears to be specific to Onopordum

The influence of light attenuation on the biogeomorphology of a marine karst cave: a case study of Puerto Princesa Underground River, Palawan, the Philippines

Karst caves are unique biogeomorphological systems. Cave walls offer habitat for microorganisms which in-turn have a geomorphological role via their involvement in rock weathering, erosion and mineralisation. The attenuation of light with distance into caves is known to affect ecology, but the implications of this for biogeomorphological processes and forms have seldom been examined. Here we describe a semi-quantitative microscopy study comparing the extent, structure, and thickness of biocover and depth of endolithic penetration for samples of rock from the Puerto Princesa Underground River system in Palawan, the Philippines, which is a natural UNESCO World Heritage Site. Organic growth at the entrance of the cave was abundant (100% occurrence) and complex, dominated by phototrophic organisms (green microalgae, diatoms, cyanobacteria, mosses and lichens). Thickness of this layer was 0.28 ± 0.18 mm with active endolith penetration into the limestone (mean depth = 0.13 ± 0.03 mm). In contrast, phototrophs were rare 50 m into the cave and biofilm cover was significantly thinner (0.01 ± 0.01 mm, p < 0.000) and spatially patchy (33% occurrence). Endolithic penetration here was also shallower (< 0.01 mm, p < 0.000) and non-uniform. Biofilm was found 250 m into the cave, but with a complete absence of phototrophs and no evidence of endolithic bioerosion. We attribute these findings to light-induced stress gradients, showing that the influence of light on phototroph abundance has knock-on consequences for the development of limestone morphological features. In marine caves this includes notches, which were most well-developed at the sheltered cave entrance of our study site, and for which variability in formation rates between locations is currently poorly understood

Functionalized Enzyme-Responsive Biomaterials to Model Tissue Stiffening in vitro

The mechanical properties of the cellular microenvironment play a crucial role in modulating cell function, and many pathophysiological processes are accompanied by variations in extracellular matrix (ECM) stiffness. Lysyl oxidase (LOx) is one of the enzymes involved in several ECM-stiffening processes. Here, we engineered poly(ethylene glycol) (PEG)-based hydrogels with controlled mechanical properties in the range typical of soft tissues. These hydrogels were functionalized featuring free primary amines, which allows an additional chemical LOx-responsive behavior with increase in crosslinks and hydrogel elastic modulus, mimicking biological ECM-stiffening mechanisms. Hydrogels with elastic moduli in the range of 0.5–4 kPa were obtained after a first photopolymerization step. The increase in elastic modulus of the functionalized and enzyme-responsive hydrogels was also characterized after the second-step enzymatic reaction, recording an increase in hydrogel stiffness up to 0.5 kPa after incubation with LOx. Finally, hydrogel precursors containing HepG2 (bioinks) were used to form three-dimensional (3D) in vitro models to mimic hepatic tissue and test PEG-based hydrogel biocompatibility. Hepatic functional markers were measured up to 7 days of culture, suggesting further use of such 3D models to study cell mechanobiology and response to dynamic variation of hydrogels stiffness. The results show that the functionalized hydrogels presented in this work match the mechanical properties of soft tissues, allow dynamic variations of hydrogel stiffness, and can be used to mimic changes in the microenvironment properties of soft tissues typical of inflammation and pathological changes at early stages (e.g., fibrosis, cancer)

PET and PVC separation with hyperspectral Imagery

Traditional plants for plastic separation in homogeneous products employ material physical properties (for instance density). Due to the small intervals of variability of different polymer properties, the output quality may not be adequate. Sensing technologies based on hyperspectral imaging have been introduced in order to classify materials and to increase the quality of recycled products, which have to comply with specific standards determined by industrial applications. This paper presents the results of the characterization of two different plastic polymers—polyethylene terephthalate (PET) and polyvinyl chloride (PVC)—in different phases of their life cycle (primary raw materials, urban and urban-assimilated waste and secondary raw materials) to show the contribution of hyperspectral sensors in the field of material recycling. This is accomplished via near-infrared (900–1700 nm) reflectance spectra extracted from hyperspectral images acquired with a two-linear-spectrometer apparatus. Results have shown that a rapid and reliable identification of PET and PVC can be achieved by using a simple two near-infrared wavelength operator coupled to an analysis of reflectance spectra. This resulted in 100% classification accuracy. A sensor based on this identification method appears suitable and inexpensive to build and provides the necessary speed and performance required by the recycling industry

Il progetto Nessuno resta indietro: formazione alla ricerca didattica

La chiusura delle scuole che ha provocato un incremento significativo della povertà educativa ha sollecitato l’opportunità di progettare interventi integrati di service learning per favorire il recupero e il potenziamento dei minori in difficoltà. 869 studenti del Corso di Laurea Magistrale in Scienze della Formazione Primaria dell’Università degli Studi di Palermo, sono stati coinvolti nella progettazione e nella realizzazione di percorsi didattici mirati, rivolti agli alunni “fragili” di 33 scuole palermitane. Complessivamente sono state erogate 60,000 ore in DAD di attività di recupero e di potenziamento dell’apprendimento di alunni della scuola primaria di Palermo. Le attività didattiche sfidanti hanno favorito la stimolazione cognitiva e lo sviluppo della motivazione per l’apprendimento degli alunni e la responsabilità nella formazione alla ricerca didattica.School closures due to COVID-19 have brought significant disruptions to education. Service-learning interventions have offered significant opportunities to reduce and reverse the long-term negative effects and to empower the recovery process of pupils in difficulty. The study was carried out with 869 students enrolled in the Primary Education Sciences master’s degree course at the University of Palermo. The participants have been involved in the planning and implementation of targeted educational courses designed for the “fragile” pupils from 33 different schools in Palermo. The primary level pupils were provided with a total of 60,000 hours of recovery and learning enhancement activities in remote mode. Challenging teaching activities fostered cognitive and learning development of the pupils and responsibility in teaching educational research