999 research outputs found
Estereotipos de género en la enseñanza de Matemática. Una mirada a las perspectivas de docentes de nivel medio del ciclo superior de escuelas medias públicas y privadas del departamento San Martín en la provincia de Santa Fe durante el año 2021
No full textFil: Ellena, Valeria Silvana. Universidad Nacional de Quilmes; Argentina.La investigación indaga acerca de la existencia de estereotipos de género en las prácticas cotidianas de enseñanza del cuerpo docente de Matemática del Ciclo Superior del Nivel Secundario1 del Departamento San Martín en la Provincia de Santa Fe, para comprender cómo los mismos repercuten en su enseñanza.
Se abordó desde una metodología cualitativa, con un diseño descriptivo y fue realizada durante el ciclo lectivo 2021 atravesado por la pos pandemia en escuelas de la región seleccionadas según disposición del personal docente a participar, disponibilidad de la investigadora y accesibilidad de las autoridades escolares.
Se trabajó desde una perspectiva de género, situada, con docentes de Matemática a través observaciones de clases no participantes y de entrevistas en profundidad utilizando un cuestionario semiestructurado, las que fueron grabadas en audios y transcritas luego para su análisis.This research project investigates the existence of gender stereotypes in the daily teaching practices of Mathematics teachers of Higher Secondary Level2 in San Martín County, in the Province of Santa Fe, to understand how they affect their teaching practices.
It was approached from a qualitative methodology, with a descriptive design and was carried out during the 2021 school year, which was affected by the post-pandemic times, in schools in the region which were selected according to the willingness of the teachers to participate, the availability of the researcher and the approachability of the school authorities.
It was carried out from a situated gender perspective, with teachers of Mathematics through non-participating observations of classes and in-depth interviews using a semi-structured questionnaire, which were audio-recorded and later transcribed for analysis
cexA and its regulatory processes - the manganese mistery of A. niger
No full textcexA and its regulatory processes – a closer look into the citric acid production
mechanisms of Aspergillus niger
Authors: Aline Reinfurt, Valeria Ellena, Matthias G. Steiger
Aspergillus niger is an important filamentous fungus used for the industrial production
of citric acid. One of the main contributors to high citric acid accumulation by the
fungus is the citrate transporter CexA. It belongs to the major faciliatory superfamily
subclass DHA1 which act as drug-H+ antiporters1. Since cexA and its regulators are
essential within the citric acid production process, it is important to study their
regulatory mechanism, which is the focus of this work. LaeA for one is known to be a
major regulator of the cexA gene. It regulates the expression via methylation levels of
the histones H3K4 and H3K92. There are indications that other transcriptional
regulators such as AmyR and XlnR are also involved in the regulation of cexA on a
transcriptional level. Another factor that affects citric acid production is the amount of
manganese that is present during the production process. Observations showed that
the fungus develops a certain pellet-like morphology under manganese limitation
conditions and that this limitation is decisive for high citric acid accumulation by A.
niger3,4. However, the exact mode of action of manganese in the cell is not clear. The
transcriptional influence of manganese on cexA and laeA is investigated in order to
find out more about the connection between manganese limitation and citric acid
production
cexA and its regulatory processes - the manganese mistery of A. niger
No full textcexA and its regulatory processes – a closer look into the citric acid production
mechanisms of Aspergillus niger
Authors: Aline Reinfurt, Valeria Ellena, Matthias G. Steiger
Aspergillus niger is an important filamentous fungus used for the industrial production
of citric acid. One of the main contributors to high citric acid accumulation by the
fungus is the citrate transporter CexA. It belongs to the major faciliatory superfamily
subclass DHA1 which act as drug-H+ antiporters1. Since cexA and its regulators are
essential within the citric acid production process, it is important to study their
regulatory mechanism, which is the focus of this work. LaeA for one is known to be a
major regulator of the cexA gene. It regulates the expression via methylation levels of
the histones H3K4 and H3K92. There are indications that other transcriptional
regulators such as AmyR and XlnR are also involved in the regulation of cexA on a
transcriptional level. Another factor that affects citric acid production is the amount of
manganese that is present during the production process. Observations showed that
the fungus develops a certain pellet-like morphology under manganese limitation
conditions and that this limitation is decisive for high citric acid accumulation by A.
niger3,4. However, the exact mode of action of manganese in the cell is not clear. The
transcriptional influence of manganese on cexA and laeA is investigated in order to
find out more about the connection between manganese limitation and citric acid
production
The fungal sexual revolution continues: indications of sexuality in the citric acid producing fungus Aspergillus niger
No full textSexual reproduction is an important proliferation mechanism which provides advantages to a species by promoting genetic variation. Interestingly, for a large group of fungal species, including the industrially relevant Aspergillus niger, this mode of reproduction has not been described yet. In recent years, strong indications of the sexual potential of A. niger have accumulated 1. These include the ability of certain strains to produce pre-mature sexual structures (sclerotia) and the presence of a mating type MAT1-1 locus in the commonly used A. niger strains, such as ATCC 1015 and CBS 513.88.
Here we show additional evidence of the sexual potential of A. niger. Formation of sclerotia could be induced in the progenitor of the industrial citric acid producing strains of A. niger, ATCC 1015, and in pyrG mutants derived from it 2. The capability of ATCC 1015 to form sclerotia, known to act as sexual structures in related organisms, represents a step forward towards the discovery of a sexual cycle in this important industrial species. To find the second mating type locus, we performed genome sequencing of the A. niger neotype strain CBS 554.65 and identified the missing MAT1-2 locus 3. A nucleotide alignment showed a different orientation of the MAT1-1 locus of ATCC 1015 compared to the MAT1-2 locus of CBS 554.65. While the genomic context of the MAT1-2 locus in CBS 554.65 is similar to the one of other MAT1-2 A. niger strains and other Aspergillus species, the region comprising the MAT1-1 locus is inverted in all sequenced strains of A. niger. These observations suggest the occurrence of genetic flipping or switching events at the MAT1-1 locus of A. niger, which might have a direct impact on its sexuality. These results provide new insights in the mating system of A. niger and pave the way for the discovery of a sexual cycle in a species long thought to be asexual.
1. Ellena, V., Sauer, M. & Steiger, M. G. Fungal Biol. Biotechnol. 7, 17 (2020).
2. Ellena, V., Bucchieri, D., Arcalis, E., Sauer, M. & Steiger, M. G. Fungal Biol. 125, 485–494 (2021).
3. Ellena, V., Seekles, S. J., Ram, A. F. J. & Steiger, M. G. BMC Genomics 1–17 (2021)
Tempi strambi. Il tramonto del femminismo e l’alba queer
Full text linkE' possibile vedere nella teoria queer uno degli esempi recenti più riusciti di imperialismo culturale angloamericano? La traduzione del termine queer in altre lingue è del resto difficoltosa, come dimostra il fatto che noi parliamo appunto di movimenti e soggetti “queer” e non di movimenti “bizzarri” o soggetti “bislacchi”. La traduzione ideale di queer theory sarebbe probabilmente teoria “stramba”, aggettivo che copre sia l’area semantica originale del tedesco quer — storto, obliquo, di traverso — sia l’evoluzione del termine nella lingua inglese, dove ha assunto nel corso dei secoli il significato di “strano” e “insolito”. Negli ultimi decenni “queer” è diventato uno dei termini prediletti dei movimenti per i diritti degli omosessuali ed è stato reso popolare in ambito teorico dal lavoro di due studiose: Teresa de Lauretis e Judith Butler. Meno problematica risulta di solito la traduzione di “femminismo”, tuttavia sempre più difficile sembra rivelarsi, su entrambe le sponde dell’Atlantico, la possibilità di attribuire al vocabolo una valenza culturale e politica condivisa. Questa incertezza ha
determinato il rapido declino non solo dei women’s studies, ma anche della “teoria femminista” come strumento di analisi interdisciplinare. Possibile che l’alba del queer coincida con il tramonto del femminismo? Il saggio parte da questa domanda per proporre un percorso di lettura che evidenzia gli elementi di continuità tra teoria femminista e riflessione queer.Can we consider queer theory as a successful example of recent anglo-american cultural imperialism? The term "queer" itself has proved so culture-bound to make it almost impossible to translate into other languages, so that despite the availability of a number of synonims, in Italy (and in most European languages)the term has remained unchanged. But are the theoretical assumptions behind the uses of "queer theory" really new? This essay explores the possibility to read "queer theory" in the international tradition of "feminist studies"
LA LINGUA DI LUIGI EINAUDI FRA CLASSICISMO E PATHOS
No full textL’autrice fa una lettura linguistica dei testi di Luigi Einaudi, per individuare i caratteri lessicali, stilistici e retorici degli scritti dell’economista, del divulgatore, del giornalista, del presidente della Repubblica. Su di essi ha pesato a lungo l’etichetta di scrittore nitido, ordinato, algido. In realtà, sottoponendo la sua vastissima produzione scritta a un esame ravvicinato, emerge la straordinaria capacità nell’uso di modalità linguistiche varie: solennità sintattica e affabilità colloquiale, modi popolari e invenzioni lessicali, descrizioni a forti tinte e sobrietà estrema. Valeria Della Valle, The language of Luigi Einaudi between classicism and pathos, in Luigi Einaudi: economic freedom and social cohesion, by Alfredo Gigliobianco, Rome-Bari, 2010, p. 138-154. The author makes a linguistic reading of texts by Luigi Einaudi, to identify the lexical, stylistic and rhetorical characters of the writings of the economist, the popularizer, the journalist, the President of the Italian Republic. On them has long weighed the label of a crisp, neat, icy writer. In fact, subjecting its vast production on close examination, it reveals the extraordinary ability in the use of various language modes: solemnity, friendly conversational syntactic, lexical inventions and popular modes, descriptions with bright colors and extreme simplicity
Towards a sexual cycle in Aspergillus niger
No full textSexuelle Reproduktion ist ein wichtiger Prozess, um die Genvariation in einer Spezies zu fördern. Trotz der evolutionären Vorteile durch einen sexuellen Zyklus wurde diese Art der Vermehrung in vielen Pilzen noch nicht nachgewiesen. Jedoch wurden in letzter Zeit in verschiedenen filamentösen Pilzen Hinweise auf eine sexuelle Vermehrung gefunden. Der industriell wichtige Mikroorganismus Aspergillus niger gilt als asexuell. Allerdings belegen Analysen des Genoms dieses Pilzes die Anwesenheit eines MAT1-1 Gens, das verantwortlich für einen heterothallischen Lebensstil sein könnte. Die Entdeckung eines sexuellen Zyklus in diesem Industrie-Stamm würde es ermöglichen, nicht nur tiefere Einblicke in dessen natürliche Fortpflanzung zu gewinnen, sondern auch, neue Strategien zur Stammverbesserung zu entwickeln. Daher war das Ziel der vorliegenden Arbeit, das Vorhandensein einer sexuellen Vermehrung von A. niger zu erforschen.In diesem Projekt wurde ein A. niger Stamm mit dem zweiten Kreuzungs-Gen, MAT1-2, identifiziert und charakterisiert. Experimente wurden durchgeführt, um den gegenseitigen Einfluss der unterschiedlichen Kreuzungs-Typ-Stämme im Hinblick auf eine sexuelle Vermehrung zu untersuchen. Obwohl kein vollständiger sexueller Zyklus beobachtet werden konnte, wurde die Bildung von Sklerotien induziert, die in anderen Pilzen wichtige Funktionen im sexuellen Zyklus ausüben. Neben einer detaillierten Analyse der Sklerotien durch Licht- und Elektronmikroskopie wurden außerdem die MAT Gene mit Hilfe von Gentechnik-Methoden inaktiviert oder überexprimiert und erste Einblicke ihrer Funktion gewonnen. Die Ergebnisse stellen die Basis für die weitere Forschung über das MAT System in A. niger dar. Obwohl eine Stammverbesserung durch die sexuelle Vermehrung in A. niger noch nicht erfolgreich durchgeführt werden konnte, wurden dennoch neue Stämme durch den parasexuellen Zyklus, einem alternativen Prozess zur Erzeugung bestimmter Genvariationen, generiert.Sexual reproduction is an important mechanism which can provide advantages to a species by promoting genetic variation. Interestingly, however, for a large group of fungal species this mode of reproduction has not been described yet. In recent years evidence of the sexual potential of presumably asexual filamentous fungi has been gathered. Aspergillus niger, a relevant industrial microorganism, belongs to the fungal species so far considered asexual. Genome analyses provided strong indications that this fungus might be able to undergo sexual development. One of these indications is the presence of the MAT1-1 gene in the sequenced A. niger strains, suggesting the existence of a heterothallic lifestyle. The discovery of a sexual cycle in this important industrial microorganism would not only broaden its current biological knowledge but also allow to develop new strategies for strain improvement. Therefore, this work was conceived to expand the current knowledge of the sexual potential of A. niger.In this study an A. niger strain containing the opposite mating-type gene, MAT1-2, was identified and characterized. Experiments were set up to study the reciprocal influence of the opposite mating-type strains and, ultimately, to induce a sexual cycle. Although complete sexual development was not observed in the performed crossing experiments, the formation of sclerotia, known to act as sexual structures in related species, was induced. The nature and the morphology of the sclerotia were determined by macroscopical and microscopical methods. Moreover, genetic engineering strategies were used in order to inactivate or overexpress the MAT genes and get an insight into their function. The results obtained here set the basis for further analysis and understanding of the mating system in A. niger. Although strain improvement in A. niger cannot be yet performed through breeding, the alternative parasexual cycle was shown to allow the successful generation of novel strains.submitted by Valeria EllenaDissertation Universität für Bodenkultur Wien 2020Mit deutscher Zusammenfassun
White middle-class men in Rio de Janeiro. The making of a dominant subject
No full textBased on the biographical accounts of upper-middle-class white men living in wealthy parts of Rio di Janeiro, Valeria Ribeiro Corossacz analyzes specific experiences of whiteness as they are produced at the intersection of multiple categories, in particular gender, class, and sexuality. White middle class men in Rio de Janeiro investigates what it means to be classified as a white person and a man in a society known for its valorization of racial mixing and yet deeply structured by racism, class and gender inequalities. Ribeiro Corossacz focuses on certain experiences in the men’s biographical trajectories representing moments of apprenticeship in a specific model of white, heterosexual and heteronormative middle-class masculinity and describes how these experiences are constructed as normative. This book explores how class, gender and race privilege are mutually produced and perceived by these men as “normal”. Examining instances of silence and what is left unsaid but also these men’s ability to provide precise descriptions of power relations and violent episodes, the author encourages us to observe the condition of dominant subjects as a keystone of the reproduction social discrimination
El Tlacuache Núm. 422 (2010). 422 Año 10 (2010) junio. El Tlacuache
No full textLas guerras van sobre camino de papeles: la insurrección suriana en reportes de Regeneración por Valeria C. de Pina Ravest
The Creative Heritage of Valeria Fedorovna Orlova as the Basis of Domestic Forensic Handwriting Examination
Full text linkThe article is dedicated to the biography and scientific creativity of an eminent scientist, Doctor of Law, professor Valeria Fedorovna Orlova (18.01.1926–18.03.2021), who devoted her life to forensic handwriting examination. The author addresses V.F. Orlova’s main theoretical works and methodologies, and textbooks created under her supervision. The article introduces the main tasks and capacities of forensic handwriting examination in our country
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