bluuebunny/crossref_metadata_2025 huggingface dataset:
The Role of HIF1α-PFKFB3 Pathway in Diabetic Retinopathy
Authors: Min Jie , Zeng Tianshu , Roux Margaretha , Lazar David , Chen Lulu , Tudzarova Slavica
Published: May 2021

Diabetic retinopathy (DR) is the leading cause of blindness for adults in developed countries. Both microvasculopathy and neurodegeneration are implicated in mechanisms of DR development, with neuronal impairment preceding microvascular abnormalities, which is often underappreciated in the clinic. Most current therapeutic strategies, including anti-vascular endothelial growth factor (anti-VEGF)-antibodies, aim at treating the advanced stages (diabetic macular edema and proliferative diabetic retinopathy) and fail to target the neuronal deterioration. Hence, new therapeutic approach(es) intended to address both vascular and neuronal impairment are urgently needed.

The hypoxia-inducible factor 1α (HIF1α)–6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 3 (PFKFB3) pathway is critically implicated in the islet pathology of diabetes. Recent evidence highlighted the pathway relevance for pathologic angiogenesis and neurodegeneration, two key aspects in DR. PFKFB3 is key to the sprouting angiogenesis, along with VEGF, by determining the endothelial tip-cell competition. Also, PFKFB3-driven glycolysis compromises the antioxidative capacity of neurons leading to neuronal loss and reactive gliosis. Therefore, the HIF1α-PFKFB3 signaling pathway is unique as being a pervasive pathological component across multiple cell types in the retina in the early as well as late stages of DR. A metabolic point-of-intervention based on HIF1α-PFKFB3 targeting thus deserves further consideration in DR.
Beyond Trouillot
Authors: Daut Marlene L.
Published: May 2021

This essay explores the genealogy of historian and anthropologist Michel-Rolph Trouillot’s writings as related to broader trends in historical scholarship. The author suggests that it was through Silencing the Past’s acceptance and ascendance within the very North Atlantic “guild” that Trouillot deconstructs in his historical writings that the ideas of nineteenth-century Haitian historians such as Baron de Vastey, Hérard Dumesle, Beaubrun Ardouin, and Thomas Madiou produced an immeasurable influence on the direction of historical scholarship across the world. The author argues that the influence of these nineteenth-century Haitian authors can be seen everywhere in social history, especially in the concept of history from below, even though most historians in Europe and the United States have never even heard the names of these other Haitian authors.
The Byzantine Icon of the Virgin in the Church of the Blachernae: Michael Psellos on the Problem of Miraculous Timing
Authors: Chatterjee Paroma
Published: May 2021

This article looks closely at the report of a miracle that occurred in eleventh-century Constantinople in which the veil covering an icon of the Theotokos (Virgin) at the Blachernae church lifted itself miraculously. The report, scripted by the Byzantine polymath Michael Psellos, focuses in intriguing ways on the actions and nonactions of the veil when the icon presided over a judicial trial. The article contends that Psellos insists on the theme of timing (with regard to the lifting and otherwise of the veil) and the Blachernae icon's role in determining a critical, decisive moment in the arbitration of human affairs. This emphasis, in turn, bespeaks a broader concern over the timing of sacred icons during significant moments in Byzantine history as understood by contemporary chroniclers: namely, their failure to act in appropriate ways at critical moments when the empire itself was at stake.
The energetic function of the human foot and its muscles during accelerations and decelerations
Authors: Smith Ross E. , Lichtwark Glen A. , Kelly Luke A.
Published: May 2021

The human foot is known to aid propulsion by storing and returning elastic energy during steady-state locomotion. While its function during other tasks is less clear, recent evidence suggests the foot and its intrinsic muscles can also generate or dissipate energy based on the energetic requirements of the center of mass during non-steady-state locomotion. In order to examine contributions of the foot and its muscles to non-steady-state locomotion, we compared the energetics of the foot and ankle joint while jumping and landing before and after the application of a tibial nerve block. Under normal conditions, energetic contributions of the foot rose as work demands increased, while the relative contributions of the foot to center of mass work remained constant with increasing work demands. Under the nerve block, foot contributions to both jumping and landing decreased. Additionally, ankle contributions were also decreased under the influence of the block for both tasks. Our results reinforce findings that foot and ankle function mirror the energetic requirements of the center of mass and provide novel evidence that foot contributions remain relatively constant under increasing energetic demands. Also, while the intrinsic muscles can modulate the energetic capacity of the foot, their removal accounted for only a 3% decrement in total center of mass work. Therefore, the small size of intrinsic muscles appears to limit their capacity to contribute to center of mass work. However, their role in contributing to ankle work capacity is likely important for the energetics of movement.
The response of schools in Scotland to coronavirus: ‘Glow’ing together
Authors: Foy Katrina , Johnston David , Mulligan Aloyise , Shanks Rachel
Published: May 2021

Four researchers at the University of Aberdeen investigated the impact of the novel coronavirus (COVID-19) lockdown on teachers’ practice in Scotland. We analysed information collected from primary teachers, a deputy primary school head teacher, secondary teachers of Biology, English, Mathematics, a secondary school head teacher and two regional education officers on how teachers reacted, adapted and responded to the first nationwide lockdown in response to COVID-19 (n=10). Home (first space) and school (second space) are often viewed as separate contexts with clearly defined and impermeable boundaries, although children participate in both spaces (Pahl & Kelly, 2005). We sought to understand the ‘third space’ (Bhabha, 1990) between school and home that was created through online and blended teaching and learning. Working in such a space has implications and consequences for the teachers who have to institute new routines using new technologies and think about teaching differently.
Διαδικτυακή Ομαδοσυνεργατική Διδασκαλία: Μια διδακτική παρέμβαση στη Βιολογία της Α’ Λυκείου
Authors: Καττή Κωνσταντίνα
Published: May 2021

Το κλείσιμο των σχολείων τον Μάρτιο του 2020 λόγω της πανδημίας της COVID-19 οδήγησε τα εκπαιδευτικά ιδρύματα να προσαρμοστούν γρήγορα και να υιοθετήσουν πρακτικές εξ αποστάσεως εκπαίδευσης. Παρουσιάζεται διδακτική παρέμβαση που συνδυάζει ποικιλία ψηφιακών εργαλείων (διαδραστικό βίντεο, ηλεκτρονικά φύλλα εργασίας και τρισδιάστατο άτλαντα ανατομίας) σε περιβάλλον σύγχρονης τηλεκπαίδευσης με εφαρμογή ομαδοσυνεργατικής διδασκαλίας. Καταγράφονται τα μαθησιακά αποτελέσματα και οι στάσεις των μαθητών απέναντι στην εν λόγω διαδικασία, οι οποίες σε γενικές γραμμές συμπίπτουν με τις απόψεις μαθητών όπως έχουν καταγραφεί από διεθνείς μελέτες. Το διαδραστικό βίντεο, τα φύλλα εργασίας και η επεξεργασία του υλικού σε ομάδες συνέβαλαν θετικά στην κατανόηση και εμπέδωση της νέας γνώσης και ενέπλεξαν τους μαθητές ενεργά στην εκπαιδευτική διαδικασία. Ωστόσο επιβεβαιώνεται για άλλη μια φορά πως για να καταστεί αποδοτική η χρήση των ψηφιακών μέσων απαιτείται σχεδιασμός που θα λαμβάνει υπόψη του παιδαγωγικές αρχές και καλές πρακτικές, ώστε να υπερκεραστούν τα εμπόδια που επιβάλλει η κοινωνική αποστασιοποίηση.
Το ερμηνευτικό σχόλιο στο λογοτεχνικό κείμενο
Authors: Λυμπέρη Θεοδώρα
Published: May 2021

Μέσα στην κρίσιμη περίοδο της υγειονομικής κρίσης κληθήκαμε να υιοθετήσουμε νέες μεθόδους και πρακτικές διδασκαλίας. Με δεδομένο πως η εκπαίδευση είναι μία και ενιαία, με την τηλεκπαίδευση - τηλεσυνάντηση καταβάλαμε την προσπάθεια να υποστηρίξουμε την εξ αποστάσεως διδασκαλία. Αξιοποιώντας τους δύο βασικούς πυλώνες της εξ αποστάσεως εκπαίδευσης, τη σύγχρονη και την ασύγχρονη, εκπονήθηκε η παρούσα διδασκαλία για παιδιά της τελευταίας τάξης του Γενικού Λυκείου, με σκοπό να υποστηριχθεί η διδασκαλία του μαθήματος της συνεξέτασης γλώσσας και λογοτεχνίας, καθώς ο ερμηνευτικός διάλογος μέσω κειμενικών δεικτών και αξιοποίησης αποθετηρίων ψηφιακού υλικού. Αξιοποιήθηκαν οι ΤΠΕ και η ομαδοσυνεργατική μέθοδος, ενώ μέσω κατάλληλα επιλεγμένων ασκήσεων επιδιώχθηκε η αυτοαξιολόγηση των μαθητών και μαθητριών και ακολούθησε ερωτηματολόγιο αξιολόγησης της διδασκαλίας. Στο τέλος, εξετάζεται κατά πόσο οι στόχοι επιτεύχθηκαν, ποια μαθησιακά αποτελέσματα προέκυψαν και ποιες αλλαγές θα πρέπει να γίνουν για τη βελτιστοποίηση των αποτελεσμάτων.
Επείγουσα Διαδικτυακή Διδασκαλία και Περιβαλλοντική Εκπαίδευση/Εκπαίδευση για την Αειφόρο Ανάπτυξη: ζητήματα αξιοποίησης των ψηφιακών πόρων του Φωτόδεντρου - Μαθησιακά Αντικείμενα
Authors: Λιαράκου Γεωργία , Κώστας Απόστολος , Γαβριλάκης Κώστας , Μεγάλου Ελίνα , Πάνος Αγάπιος
Published: May 2021

Το κείμενο αυτό ασχολείται με τον ρόλο που μπορούν να διαδραματίσουν τα μαθησιακά αντικείμενα της θεματικής περιοχής ‘Περιβαλλοντική Εκπαίδευση/Εκπαίδευση για την Αειφόρο Ανάπτυξη (ΠΕ/ΕΑΑ)’ του ψηφιακού αποθετηρίου Φωτόδεντρο - Μαθησιακά Αντικείμενα στην αναβάθμιση της εξΑΣΕ. Πιο συγκεκριμένα, υποστηρίζεται ότι η εκπαιδευτική διαδικασία της ΠΕ/ΕΑΑ, στο πλαίσιο της ασύγχρονης εξΑΣΕ, μπορεί να οργανωθεί και να λειτουργήσει καλύτερα μέσω μαθησιακών αντικειμένων αντί εκπαιδευτικού υλικού κειμενικού τύπου, καθιστώντας τη μάθηση ελκυστικότερη για τους/τις εκπαιδευόμενους/νες. Δίνονται παραδείγματα για το πώς μπορούν τα συγκεκριμένα μαθησιακά αντικείμενα να αξιοποιηθούν από τους/τις εκπαιδευτικούς. Υποστηρίζεται τέλος ότι τα αντικείμενα αυτά μπορούν να χρησιμοποιηθούν εξίσου αποτελεσματικά στο πλαίσιο μιας σύγχρονης εξΑΣΕ.
Ο ρόλος των διευθυντών σχολείων Δευτεροβάθμιας Εκπαίδευσης στην οργάνωση και υλοποίηση της εξ αποστάσεως εκπαίδευσης
Authors: Τάτσης Ιωάννης
Published: May 2021

Η αναστολή της λειτουργίας των σχολείων στο πλαίσιο των μέτρων που έλαβε η ελληνική πολιτεία για την αντιμετώπιση της πανδημίας του κορονοϊού, την άνοιξη του 2020 και η εφαρμογή της εξ αποστάσεως εκπαίδευσης για όσο καιρό τα σχολεία παρέμειναν κλειστά, αποτέλεσε μία πρωτόγνωρη πρόκληση για ολόκληρη την εκπαιδευτική κοινότητα. Η παρούσα εργασία αναδεικνύει τον κομβικό ρόλο που κλήθηκαν να διαδραματίσουν οι διευθυντές των σχολείων της δευτεροβάθμιας εκπαίδευσης με συγκεκριμένες αποφάσεις και ενέργειες. Μελετάται ιδιαίτερα ο τρόπος συντονισμού των εκπαιδευτικών και των μαθητών στην υλοποίηση της εξ αποστάσεως εκπαίδευσης, η λειτουργία της Ομάδας υποστήριξης και η διασφάλιση της προστασίας των Προσωπικών Δεδομένων των μαθητών. Επιπλέον εξετάζεται η εξ αποστάσεως συνεδρίαση του συλλόγου διδασκόντων, η καταγραφή των ελλείψεων σε τεχνικά μέσα και άλλα πρακτικά ζητήματα.  Κεντρικός στόχος της μελέτης είναι η ανάδειξη των αδυναμιών αλλά και των δυνατοτήτων της εξ αποστάσεως εκπαίδευσης αλλά και του καίριου ρόλου της εκπαιδευτικής ηγεσίας στην εφαρμογή της στην ελληνική εκπαιδευτική πραγματικότητα.
Εξ Αποστάσεως Εκπαίδευση: Διοικητικά - Οργανωτικά - Θεσμικά Προβλήματα στην Πρωτοβάθμια Εκπαίδευση
Authors: Παπαδόπουλος Σταύρος
Published: May 2021

Η παρούσα εισήγηση έχει κεντρικό θέμα της την εξ αποστάσεως εκπαίδευση και τις δύο μορφές, την ασύγχρονη και τη σύγχρονη. Έχοντας ως σημείο αναφοράς την πρόσφατη αναστολή λειτουργίας των σχολείων λόγω της πανδημίας παρουσιάζουμε μια μελέτη περίπτωσης εφαρμογής εξ αποστάσεως εκπαίδευσης. Αναλύουμε και παρουσιάζουμε πώς εφαρμόστηκε τόσο η ασύγχρονη όσο και η σύγχρονη εξ αποστάσεως εκπαίδευση σε ένα σχολείο της Ρόδου, το 1ο Δημοτικό Σχολείο Ιαλυσού. Αναφέρουμε τις πρακτικές που εφαρμόστηκαν στο σχολείο, πώς οδηγηθήκαμε σε αυτές, το ωρολόγιο πρόγραμμα, το πρόγραμμα του τμήματος ένταξης και το πρόγραμμα των μαθητών/τριων της παράλληλης στήριξης. Εστιάζουμε στα διοικητικά, οργανωτικά και θεσμικά προβλήματα που προέκυψαν στην εφαρμογή τους το διάστημα αυτό.   Η εισήγηση ολοκληρώνεται με συμπεράσματα και προτάσεις για την εξ αποστάσεως εκπαίδευση στη χώρα μας.
Η εμπειρία της οργάνωσης της εξ αποστάσεως εκπαίδευσης δυο δημοτικών σχολείων της Κορινθίας στις μέρες του κορονοϊού
Authors: Σοφός Παναγιώτης , Χρόνη Σοφία
Published: May 2021

Η παρούσα εργασία αποτελεί ένα χρονικό των ενεργειών που υλοποιήθηκαν σε δυο δημοτικά σχολεία της Κορινθίας για την προώθηση της εξ αποστάσεως εκπαίδευσης από το ΥΠΑΙΘ στις μέρες που ήταν κλειστά λόγω κορονοϊού. Εστιάζει στον ρόλο της διεύθυνσης των σχολείων για τη διατήρηση της επικοινωνίας, της συνοχής, της ενθάρρυνσης και της καθοδήγησης των μελών της σχολικής κοινότητας, ώστε να αντιμετωπισθούν, οι δυσκολίες, οι προβληματισμοί και τα πολλαπλά, οργανωσιακά, ζητήματα που προέκυψαν από την επείγουσα ανάγκη άμεσης εφαρμογής της. Καταλήγει με τη διαπίστωση πως η ξαφνική υιοθέτηση της εξ αποστάσεως εκπαίδευσης ναι μεν δίνει νέες προοπτικές σε οργανωσιακό και μαθησιακό επίπεδο στο σχολείο, δεν σταματά όμως με το άνοιγμα των σχολείων, ούτε πρέπει να περιορίζεται στην τεχνολογική διάσταση του επιχειρήματος. Τα ψηφιακά μέσα δίνουν παιδαγωγικές δυνατότητες που θα πρέπει να αξιοποιηθούν, αν θέλουμε να έχουμε την αλλαγή παραδείγματος στην εκπαίδευση που οι καιροί σήμερα επιβάλλουν. Για να είναι δυνατή όμως αυτή η αξιοποίηση θα πρέπει να αλλάξει η ισχύουσα παρωχημένη σχολική πρακτική που την περιορίζει. Καθοριστικός αναδεικνύεται ο ηγετικός ρόλος των διευθυντών/ντριών των σχολείων στη διαμόρφωση μιας συνεργατικής κουλτούρας, ικανής να αναδιαρθρώσει τις προσπάθειες όλων των μελών της εκπαιδευτικής κοινότητας στη βελτίωση της μάθησης μέσα από την εξ αποστάσεως εκπαίδευση, αλλά και στην κατεύθυνση της, χωρίς αποκλεισμούς, συμπεριληπτικής εκπαίδευσης που επίσης, διακυβεύτηκε στις μέρες του κορονοϊού.
Ένας εναλλακτικός τρόπος αξιοποίησης της έρευνας σε μαθητές Λυκείου
Authors: Ντάκουλα Αικατερίνη
Published: May 2021

Η εφαρμογή εναλλακτικών διδακτικών προσεγγίσεων στο σύγχρονο σχολείο προϋποθέτει δημιουργικότητα και φαντασία από τον εκπαιδευτικό, συνδυαζόμενη με τις αρχές της Παιδαγωγικής και του Αναλυτικού Προγράμματος Σπουδών. Στόχος της παρούσας εισήγησης είναι να συμβάλλει σε μια διαφορετική προσέγγιση της Βυζαντινής Ιστορίας για τους μαθητές της Β΄ Λυκείου και συγκεκριμένα πτυχών της καθημερινής ζωής των Βυζαντινών, μέσα από την ανίχνευση διαδικτυακών ιστορικών πηγών, την αναζήτηση πληροφοριών σε εγκεκριμένους διδακτικούς ιστότοπους και τη σύνθεση σε μια ευρετική πορεία προς τη γνώση. Αυτό που επιδιώκεται είναι η διανοητική και συναισθηματική κινητοποίηση του μαθητή, στηριγμένη στα βασικά σημεία του θεωρητικού σχεδιασμού της βιωματικής προσέγγισης  με την αξιοποίηση της συνεργασίας των μαθητών και των προσωπικών τους βιωμάτων. Στην εισήγηση παρουσιάζονται ο σχεδιασμός των φάσεων, η εφαρμογή και η υλοποίηση τους με τη χρήση πολυμεσικού/πολυτροπικού υλικού μέσω σύγχρονης και ασύγχρονης εξ αποστάσεως διδασκαλίας. Επιπλέον, αναφέρονται οι προβληματισμοί, οι δυσκολίες και τα εμπόδια που αναστέλλουν τη διάχυση των γνώσεων και δυσχεραίνουν τη μαθησιακή διεργασία σε περιβάλλοντα εξΑΕ.
Άγχος και δεξιότητες εκπαιδευτικών κατά τη διαχείριση της εκπαιδευτικής κρίσης λόγω της πανδημίας COVID-19
Authors: Ράικου Νατάσσα , Κωνσταντοπούλου Γεωργία , Λαβίδας Κωνσταντίνος
Published: May 2021

Η παρούσα μελέτη διερευνά τις άμεσες ψυχολογικές συνέπειες που είχε η απότομη μετάβαση σε εξ αποστάσεως εκπαίδευση λόγω της πανδημίας COVID-19 στους Έλληνες εκπαιδευτικούς, όσον αφορά το άγχος και την αίσθηση επάρκειας των προσωπικών τους δεξιοτήτων. Η ανησυχία λόγω των συνθηκών και η αλλαγή της εκπαιδευτικής τους ρουτίνας αποτελούν, σύμφωνα με τη βιβλιογραφία, παράγοντες που είναι δυνατό να οδηγήσουν τους εκπαιδευτικούς σε άγχος και δυσκολία διαχείρισης του νέου τρόπου διδασκαλίας. Στην έρευνα, η οποία υλοποιήθηκε από το Πανεπιστήμιο Πατρών δύο μήνες μετά την έναρξη της εξ αποστάσεως εκπαίδευσης, συμμετείχαν 98 εκπαιδευτικοί πρωτοβάθμιας και δευτεροβάθμιας εκπαίδευσης Δυτικής Ελλάδας. Ως εργαλείο της έρευνας αξιοποιήθηκε ένα ερωτηματολόγιο, το οποίο περιλάμβανε δημογραφικά στοιχεία, το Ερωτηματολόγιο Αυτοεκτίμησης (STAI) και επιλεγμένες ερωτήσεις από το Ερωτηματολόγιο Προσωπικών Δεξιοτήτων (PSI). Η στατιστική ανάλυση έδειξε ότι οι εκπαιδευτικοί παρουσίασαν άγχος και μειωμένη αυτοεικόνα στις δεξιότητες διαχείρισης της κρίσης, ενώ αναδύεται η αναγκαιότητα ενίσχυσής τους με στοχευμένα επιμορφωτικά προγράμματα.
Δημιουργία σταυρολέξων με το crosswordlabs και ιστορικής γραμμής με το timetoast. Η αξιοποίησή τους στην εξαε λόγω covid-19
Authors: Μαρτίνου Σωτηρία
Published: May 2021

H υποχρέωσή μας ως ΣΕΕ ΠΕ70 να επιμορφώσουμε τους/τις εκπαιδευτικούς, το διάστημα της πανδημίας του κορονοϊού COVID-19 στην αξιοποίηση ψηφιακών εργαλείων, μας οδήγησε στην επιμόρφωση – εργαστήριο παρουσίασης της δημιουργίας σταυρολέξων με το Cross Word Labs με ερωτήσεις για τον κορονοϊό τις οποίες δημιουργήσαμε και ιστορικής γραμμής με το ΤimeToast με σημαντικές ημερομηνίες οδηγιών για την εκπαίδευση στη διάρκεια της καραντίνας, τις οποίες και εντάξαμε στην ιστορική γραμμή. Στο εργαστήριο θα φανεί πως η δραστηριοποίηση στα παραπάνω δωρεάν και εύχρηστα εργαλεία διευκολύνει την εμπέδωση της γνώσης, τον έλεγχο της κατάκτησής των στόχων και των εννοιών με εναλλακτικό τρόπο, αλλά και την αλληλεπίδραση και την ενίσχυση με ευχάριστο τρόπο. Επίσης η ιστορική γραμμή με το ΤimeToast βοηθά στην οργάνωση της σκέψης σε θέματα ιστορικά ή διδακτικά, και στην διαμοίρασή τους με την αποστολή του σχετικού συνδέσμου. Οι δυνατότητες επεξεργασίας των δημιουργημάτων και η δυνατότητα αναζήτησης υλικού στις βιβλιοθήκες των παραπάνω περιβαλλόντων, καθιστούν τα παραπάνω εργαλεία, ιδιαίτερα χρήσιμα.
Καθοδηγούμενος σχεδιασμός ψηφιακών ιστοριών από μαθητές σε συνθήκες εξ αποστάσεως εκπαίδευσης
Authors: Μπράτιτσης Θαρρενός
Published: May 2021

Η παρούσα εργαστηριακή συνεδρία αποσκοπεί στην επιμόρφωση των συμμετεχόντων στο σχεδιασμό και δραστηριοτήτων με στόχο την καθοδήγηση μαθητών στο σχεδιασμό ψηφιακών ιστοριών, σε συνθήκες εξ αποστάσεως εκπαίδευσης. Για το λόγο αυτό αξιοποιούνται βήματα από την προσέγγιση της Σχεδιαστικής Σκέψης, η οποία και παρουσιάζεται συνοπτικά. Στη συνέχεια, αναλύονται τα στάδια ανάπτυξης μιας ψηφιακής ιστορίας ώστε να αντιστοιχούν με αυτά της σχεδιαστικής σκέψης. Με βάση αυτή την αντιστοίχιση παρουσιάζονται ιδέες και εργαλεία για την καθοδήγηση των μαθητών μέσα από τα στάδια αυτά, εστιάζοντας κυρίως στα δύο πρώτα. Ο καθοδηγούμενος σχεδιασμός ψηφιακών ιστοριών από μαθητές μπορεί να αποτελέσει μια σημαντικής αξίας προσέγγιση για την υλοποίηση μικρών project μαθητοκεντρικού χαρακτήρα σε συνθήκες εξ αποστάσεως εκπαίδευσης.
Association of subgingival Epstein–Barr virus and periodontitis
Authors: Maulani Chaerita , C. Masulili Sri Lelyati , Santoso Widayat Djoko , Soedarsono Nurtami , Kusdhany Lindawati , Auerkari Elza Ibrahim
Published: May 2021

Background: The Epstein–Barr virus (EBV) is gaining interest as a possible agent in the etiology of periodontitis. Previous studies have shown controversy on whether EBV DNA in the subgingival periodontal pockets is associated with periodontitis. The aim of the present study was to seek the potential relationship between EBV and periodontitis.

Methods: Data on socio-demographics, oral health, and periodontal health were recorded, and samples were collected from gingival crevicular fluid, using sterile paper point. This case–control study of 118 participants included 59 subjects with severe periodontitis and 59 control subjects with mild periodontitis. The EBV load was determined by quantitative real-time PCR.

Results: EBV DNA was detected in 37.3% of the case samples and in 18.6% of the control samples. There was no significant difference in the load of EBV DNA between severe and mild periodontitis (p>0.05). The observed load of EBV DNA was up to 4.55x105 copies/mL. The detected EBV DNA was significantly associated with the plaque index and the oral hygiene index (all p<0.05).

Conclusions: A significant association was not found, but EBV might contribute to periodontitis. Gingival crevicular fluid is useful for monitoring the EBV load by the real-time PCR technique.
Novel Twenty20 batting simulations: a strategy for research and improved practice
Authors: Lopes Tiago , Goble David , Olivier Benita , Kerr Samantha
Published: May 2021

Twenty20 cricket and batting in particular have remained vastly understudied to date. To elucidate the effects of batting on the batter, tools which replicate match play in controlled environments are essential. This study describes the development of two Twenty20 batting simulations, for a high and low strike rate innings, generated from retrospective analysis of international and domestic competition. Per delivery analysis of probabilities of run-type and on/off-strike denomination produce ball-by-ball simulations most congruent with retrospective competitive innings. Furthermore, both simulations are matched for duration and dictated through audio files. The `high' strike rate innings requires a batter to score 88 runs from 51 deliveries, whereby 60 runs are from boundaries. Similarly, the `low' strike rate innings requires a batter to score 61 runs from 51 deliveries, where 27 runs are scored from boundaries. Because batting simulations dictate run scoring outcomes, a method of quantifying a batter's performance from bat-ball contact scores is described. Ten elite batters achieved a mean performance score of 72 (SD = 26) and 88 (21) for the low and high strike rate simulations respectively. This study provides sport practitioners with a training technique to improve specific skill acquisition and enables research in understudied Twenty20 batting.
Economics and organization of food enterprises
Authors: Davydovich Anna
Published: May 2021

The textbook allows you to study the whole range of issues related to the organization and economic activities of catering enterprises in the sanatorium-resort complex. Of particular value are the accompanying economic calculations based on data from the practice of catering enterprises of various forms of ownership of the sanatorium and resort complex.
Meets the requirements of the federal state educational standards of secondary vocational education of the latest generation.
For students studying in the specialties 43.02.15 "Cookery and confectionery", 19.02.10 "Technology of public catering products", 43.02.01 "Organization of service in public catering", as well as for individuals who independently study the economy and organization of public catering enterprises, entrepreneurs, managers and managers of public catering enterprises.
Tax audit
Authors: Bogdanova Marina
Published: May 2021

The textbook is prepared in accordance with the curriculum for the discipline "Tax Audit". It reveals the basics of tax audit in accordance with the methodology of the audit of calculations with the budget for taxes and fees, contains recommended methods of auditing basic taxes, practical tasks, a list of recommended literature for self-study of the discipline and topics for abstracts.
Meets the requirements of the federal state educational standards of higher education of the latest generation.
For students of educational institutions of higher education, studying in the areas of training 38.04.01 and 38.03.01 "Economics".
Linguistic foundations of business communication
Authors: Kon'kov Vladimir , Surikova Tat'yana
Published: May 2021

In the textbook, in section I, the norms and standards of the official business style, genre templates, rules for preparing documents, and the basics of business ethics are set out in a simple, accessible form. It highlights aspects of business communication that, despite their importance, are not reflected in manuals on similar topics. This is information about the problems of adequate understanding of information, working with business terminology, and also gives an assessment of business jargon. Special attention is paid to the forms of information compression in the business text. The theoretical positions are illustrated by relevant examples from various areas of institutional communication.
Section II offers a system of exercises for working with the voice as the main tool of business communication. This is the development of good diction and correct reading skills, exercises for mastering the basic rules of Russian orthoepy. Recommendations are given for preparing for a successful oral presentation. The features of phrase construction, the length of the phrase, contact-setting means, the rhetorical potential of the influencing speech, working with special vocabulary and digital information are considered.
Meets the requirements of the federal state educational standards of higher education of the latest generation.
For undergraduate students studying in management-related specialties.
Can your partner influence your physical activity? The role of social support provided by partners
Authors: Ferreira Rodrigo Wiltgen , Domingues Marlos Rodrigues
Published: May 2021

The study aims to evaluate the association between social support from partners (SSP) and physica activity (PA) levels. A cross-sectional study conducted in 26 gyms (n = 390) from Pelotas, Rio Grande do Sul, Brazil. Methods: PA was measured using questions about frequency/duration of PA performed at the gym and elsewhere and analyzed as numerical and dichotomized (median). SSP was measured using a validated questionnaire and analyzed in quartiles. Respectively, Linear and Poisson regression were used to assess the associations. SSP was associated with PA in both analyses. Persons belonging to the highest SSP quartile performed 66.1 (95%CI: 11.1 - 121.0) more minutes of PA and had 1.37 (95%CI: 1.01 – 1.85) higher probability to perform more than 300 min/week of PA than those from the lowest SSP quartile. SSP was associated with PA, researchers must consider the potential of SSP when targeting PA behavioral changes.
Hematological, serum biochemical and histopathological effects of selected herbs and combinations on Trypanosoma brucei infected West African dwarf sheep
Authors: Olatunde Olusegun , Jegede Henry Olanrewaju , Ameen Saliu
Published: May 2021

Abstract. Olatunde OA, Jegede HO, Ameen SA. 2021. Hematological, serum biochemical and histopathological effects of selected herbs and combinations on Trypanosoma brucei infected West African dwarf sheep. Asian J Nat Prod Biochem 19: 10-16. The present work was carried out to study the hematological, serum biochemical and histopathological effects of selected herbal diets on trypanosome infected West African dwarf sheep. Five herbal incorporated diets were tested where A is control diet, B is Citrus aurantifolia; C is Ocimum gratissimum, D is Vernonia amygdalina + Citrus aurantifolia and E is Ocimum gratissimum + Vernonia amygdalina. Sheep on Diets E, A, C, B, and D consumed 856.4g/d, 830g/d, 750.0g/d. 734.0g/d and 687.0g/d respectively showing more acceptability to diet E. Additionally, sheep on Diet E was highest in RBC, WBC, Hb, lymphocyte, PCV and basophils. The least hematological indices were recorded for the animals on Control diet (A) showing that all herbal diets improved blood indices of the infected sheep. The ALP concentration was significantly different (17.000i.u/l) in Diet B compared to other Diets while the least ALP was noted for sheep on Diets A and B. Herbs and combinations used in this study significantly improved both hematological and pathological lesions seen in experimental trypanosomosis caused by Trypanosoma brucei infection in sheep. Best results were gotten from Diet E combinations.
Rib fracture fixation in a patient on veno-venous ECMO for severe blunt thoracic trauma
Authors: Whittaker D , Edmunds C , Scott I , Khalil M , Stevenson I
Published: May 2021

Thoracic chest wall trauma is a common injury in patients admitted to hospital following injury and is associated with high mortality. British Orthopaedic Association Standards for Trauma and Orthopaedics guidelines recommend consideration of rib fracture fixation in patients with flail chest wall injuries with respiratory compromise or uncontrollable pain. Veno-venous extracorporeal membrane oxygenation (ECMO) can be utilised in patients with severe respiratory dysfunction and we present the case of a patient who underwent rib fracture fixation while receiving ECMO. A 32-year-old male was admitted to our department following a 4.5m fall. He sustained significant thoracic injuries with multiple ribs fractures and a flail segment from the right fourth to ninth ribs. Treatment consisted of bilateral chest drains, ECMO support, tracheostomy and rib fracture fixation to the eighth and ninth ribs. The patient made a rapid recovery following surgery and ECMO support was ceased 2.5 days postoperatively. The case shows that a well-prepared, combined specialty surgical team can safely perform rib fixation for a patient on ECMO.
REDE DE SENTIDOS E ANTAGONISMO: RECONSTRUINDO OS FIOS
Authors: Sombra Laurenio Leite
Published: May 2021

RESUMO: Este artigo visa retomar e aprofundar os conceitos de rede de sentidos e antagonismo, desenvolvidos a partir de 2015 e desde então aprofundados ao longo de artigos, comunicações, discussões e diálogos com a realidade. O conceito de rede de sentidos foi pensado como “certa constituição abrangente do sujeito, certa ambiência prévia, basilar para uma série de operações parciais, como a ação cotidiana, a atribuição de significado de uma palavra ou de um enunciado, a compreensão de práticas sociais em geral, enfim, para os diversos processos de atribuição de sentido”, noção ao mesmo tempo prática e dependente da “promessa de identidade” decorrente do signo linguístico. O antagonismo, por sua vez, se dá pela tensão da relação entre redes de sentidos diferentes, com desdobramentos decorrentes das negociações que essas tensões provocam. A partir dessas noções, é possível pensar, por exemplo, os sujeitos da América Latina, utilizando-se do conceito de colonialidade de Aníbal Quijano; e mencionar um diálogo, em pleno andamento, com a ontologia do ser social de Marx e Lukács.PALAVRAS-CHAVE: rede de sentidos; antagonismo; colonialidade; ontologia do ser social.ABSTRACT: This article aims to resume and deepen the concepts of network of sense and antagonism, developed since 2015 and since then deepened throughout articles, communications, discussions and dialogues with reality. The concept of network of sense was thought of as “a certain comprehensive constitution of the subject, a certain previous ambience, essential for a series of partial operations, such as daily action, the attribution of meaning of a word or statement, the understanding of social practices in general, in short, for the different processes of attribution of sense”, a notion that is both practical and dependent on the “promise of identity” arising from the linguistic sign. The antagonism, in turn, is due to the tension in the relationship between different networks of sense, with consequences resulting from the negotiations that these tensions provoke. From these notions, it is possible to think, for example, the subjects of Latin America, using the concept of coloniality by Aníbal Quijano; and mention a dialogue, in full swing, with ontology of social being from Marx and Lukács.KEYWORDS: network of sense, antagonism, coloniality, ontology of social being.
MARGUERITE PORETE E A ESCRITA DE SI: ENTRE A LITERATURA E A FILOSOFIA
Authors: Gomes de Lima Emanuelle Valéria , Marinho Nogueira Maria Simone
Published: May 2021

A Igreja, o Judiciário, o homem, ocuparam, desde os primórdios, os ambientes institucionais, sociais, literários e filosóficos. E, por isso, tentaram, por extenso período, evitar que mulheres ocupassem os mesmos espaços e cargos, sendo, portanto, negligenciadas em suas habilidades e, da mesma forma, silenciadas em seus lugares de fala. Apesar disso, algumas mulheres na Idade Média transgrediram essas vontades e subverteram a ordem do mundo naquele momento. É o caso de Marguerite Porete, mulher e escritora, autora da obra O espelho das almas simples e aniquiladas e que permanecem somente na vontade e no desejo do Amor, desobedecendo os ditames do campo literário/filosófico/teológico medieval ao escrever para que outras mulheres pudessem entender outra perspectiva que não apenas a da instituição Igreja que, naquela época, muitas vezes demonstrou colocar a instituição acima dos preceitos de Deus. Dito isso, o presente artigo analisa, na obra supracitada, através de uma revisão bibliográfica, o discurso da personagem Alma, a fim de verificar até que ponto as marcas linguísticas da memória retomam uma escrita de si.
EPISTEMOLOGIA FEMINISTA - NAOMI SCHEMAN
Authors: Missaggia Vaccari Rafaela , Dalva Secco Gisele
Published: May 2021

Este texto é uma tradução de “Feminist epistemology”, artigo de Naomi Scheman originalmente publicado em Metaphilosophy (v. 26, n.3, de julho de 1995) e republicado na coletânea Shifting Ground - Knowledge and Reality, Transgression and Trustworthiness (como parte da Studies in feminist philosophy, da Oxford University Press, 2011). No artigo, Scheman elucida de diferentes maneiras como “feminista” é um qualificativo legítimo para qualquer epistemologia que conceda relevância às experiências de mulheres como sujeitos de conhecimento, sem, no entanto, abrir espaço para relativismos. Ao argumentar em favor da pertinência de uma epistemologia aberta à diversidade que a perspectiva feminista proporciona, Scheman acaba por propor também um alargamento da noção de objetividade, revelando prolíficas conexões entre epistemologia e política por meio de uma reflexão sobre normas epistêmicas.  Palavras-chave: sujeitos de conhecimento, objetividade, mulheres, normas epistêmicas.
QUANDO A FILOSOFIA SE TORNA SEMENTE: VIAGEM ATRAVÉS DE MUNDOS ARTEFACTUAIS E (IM) PROVÁVEIS ENCONTROS.
Authors: Pisani Marília Mello
Published: May 2021

Neste texto vamos fazer uma viagem com Donna Haraway e diferentes seres multiespécies pelos espaços úmidos e áridos da Terra. Foram mobilizadas estratégias narrativas aprendidas com Haraway, como a cama de gato [cat's cradle], a difração, o olhar tocante [fingery eyes] e o filtro ultravioleta. Estas estratégias são essenciais para provocar um giro (tropos) nas categorias epistemológicas coloniais, produzindo um pensamento nem moderno nem pós-moderno, mas a-moderno, cujas consequências são: fazer ver como se constitui o par modernidade/colonialidade; evitar a noção de progresso, Luzes, fins ou origens; mobilizar a noção de natureza artefactual/ naturezacultura para olhar as produções semiótico-políticas da natureza, i.e., a produção artificial da natureza; possibilitar uma leitura cosmopolítica da biologia; problematizar a categoria de indivíduo a partir da noção de simbiose e holobionte; e avançar da noção de representação política para a de articulação e aliança. Haraway tece uma teia de elementos complexos para lidar com a complexidade mesma da sobrevivência da Terra no século XXI. Com a sua ajuda e a de outras tantas vozes, atravessamos alguns espaços de memórias comuns (topos) para, caminhando junto, abrir estratégias de pensamento e de ação que permitam articular as diferentes formas de (re)existência. O texto convida a uma nova postura do corpo. Para ser lido é necessário uma abertura da percepção sensível, muito mais do que da consciência. A linguagem faz muito mais do que diz. Não iremos apresentar conceitos, mas fazê-los atuar. Este é um texto para aprendizado conjunto de uma linguagem desinstitucionalizada que permita fazer vínculo para além dos espaços acadêmicos, criando encontros (im)prováveis. É assim que esperamos que a filosofia se torne semente e fertilize espaços mais úmidos e plenos de húmus.
DOSSIÊ FILÓSOFAS - APRESENTAÇÃO
Authors: Aggio Juliana Ortegosa , Saes Sílvia Faustino de Assis
Published: May 2021

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LITERATURA, MULHERES, DISCURSO FILOSÓFICO. SOBRE HELENA
Authors: Gagnebin Jeanne Marie
Published: May 2021

RESUMO: Este artigo pretende estabelecer, a partir da figura de Helena na tradição poética e filosófica (platônica) grega, como o discurso filosófico se constitui por uma recusa semelhante da beleza da ficção e da sedução das mulheres. Ficção e “feminino” apresentariam uma valorização da ambiguidade e da pluralidade de possíveis que coloca em risco a definição unívoca do conceito filosófico clássico de “verdade”. PALAVRAS-CHAVE: Ficção, Feminino, Filosofia.ABSTRACT: This paper aims to establish, based on the figure of Helen in the Greek poetic and philosophical (Platonic) tradition, how the philosophical discourse is constituted by a similar refusal of the beauty of fiction and the seduction of women. Fiction and “feminine” would present an appreciation of ambiguity and the plurality of possible ones that put at risk the univocal definition of the classic philosophical concept of “truth”.KEYWORDS: Fiction. Feminine. Philosophy.
HANNAH ARENDT SOBRE THOMAS HOBBES E O RACISMO IMPERIALISTA
Authors: Frateschi Yara
Published: May 2021

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PEDAGÓGICA DE LA LIBERACIÓN: UNA PUESTA EM PRÁCTICA
Authors: Salazar Gabriel Herrera
Published: May 2021

RESUMEN: La meta-física del cara-a-cara permite descubrir el horizonte de la pedagógica de la liberación. En la lógica de la Alteridad, la pulsión meta-física de Otro que sí, es deseo radical de amor-de-justicia. La erótica de la liberación nos lleva a trazar de manera original la teoría del antiedipo, la cual plantea un nuevo y alternativo modelo de familia; este esquema va a servir como base de otras relaciones meta-físicas cara-a-cara en otros niveles concretos como son la pedagógica, política, económica o arqueológica. El proyecto de liberación produce la reflexión sobre la construcción de un orden nuevo con amor-de-justicia, un mundo “muy otro”, es por esto que el discurso adquiere una dramatización específica donde lo estratégico y táctico son determinados desde  la praxis de liberación. PALABRAS CLAVE: Pedagógica, Erótica, Alteridad, Liberación, Justicia.ABSTRACT: The face-to-face meta-physics allows us to discover the horizon of liberation pedagogy. In the logic of the Alterity, the meta-physical drive of Other beyond yes is a radical desire for love-of-justice. The erotic of liberation leads us to trace in an original way the theory of anti-Oedipus, which raises a new and alternative family model; This scheme will serve as the basis of other face-to-face meta-physical relationships at other concrete levels such as pedagogical, political, economic or archaeological. The project of liberation produces the reflection on the construction of a new order with love-of-justice, a "very other" world, that is why the discourse acquires a specific dramatization where the strategic and tactical are determined from the praxis of liberation.KEYWORDS: Pedagogical, Erotic, Alterity, Liberation and Justice.
FLORA DA BAHIA: LEGUMINOSAE – MACROPTILIUM (PAPILIONOIDEAE: PHASEOLEAE)
Authors: Ribeiro Carolina Lima
Published: May 2021

Leguminosae é a terceira maior família de Angiospermas, possuindo mais de 19.500 espécies e 770 gêneros, com uma ampla distribuição geográfica, ocorrendo em todos os continentes com exceção da Antártica (Schrire et al. 2005; Lewis et al. 2005, 2013; LPWG 2013). Papilionoideae é a mais diversa das seis subfamílias de Leguminosae, compreendendo cerca de 14.000 espécies, 503 gêneros e 29 tribos (Lewis et al. 2005; Queiroz et al. 2015; LPWG 2017).Dentre as tribos de Papilionoideae, Phaseoleae possui o maior número de gêneros e está distribuída principalmente nas regiões tropicais e subtropicais (Lackey 1981). A subtribo Phaseolinae compreende 27 gêneros e cerca de 340 espécies, com as seguintes características morfológicas: hábito volúvel, folhas trifolioladas, estilete barbado e sementes com epihilo (Lackey 1981; Lavin & Delgado-Salinas 1990; Delgado-Salinas et al. 2011).Macroptilium (Benth.) Urb. é um gênero da subtribo Phaseolinae, monofilético (Espert et al. 2007) composto por 20 espécies distribuídas apenas na América, das quais 12 ocorrem no Brasil (Moura 2010; Delgado-Salinas et al. 2011). O gênero possui grande importância econômica e suas espécies são utilizadas como plantas forrageiras e na recuperação de áreas degradadas por sua eficiência na fixação de nitrogênio (Freitas et al. 2011).Algumas revisões taxonômicas do gênero foram feitas por Beyra & Reyes (2005) em Cuba, Drewes (1995) na Argentina e Barbosa-Fevereiro (1987) no Brasil. Entretanto, muitos espécimes depositados nos herbários não condizem com nenhuma das espécies, de fato, descritas até então. Considerando a diversidade de espécie de Macroptilium na Bahia, é de extrema relevância a revisão do gênero no estado para uma delimitação morfológica das espécies e compreensão da sua taxonomia. Desta forma, esse trabalho teve como objetivo realizar um estudo taxonômico do gênero Macroptilium na Bahia, contribuindo para o conhecimento da diversidade botânica do Estado.
ESTUDO DO EFEITO INIBITÓRIO DE ISOLADOS DE BACTÉRIAS LÁTICAS PROVENIENTES DE GRAMÍNEAS, TOMATE, BETERRABA E FRUTAS CÍTRICAS SOBRE FUSARIOSE DO ABACAXI (ANANAS COMOSUS (L.) MERRIL).)
Authors: Barbosa Débora de Jesus
Published: May 2021

O abacaxi (Ananas comosus (L.) Merril) é uma monocotiledônea, da família Bromeliaceae, subfamília Bromeloideae. O Brasil é o segundo maior produtor mundial de abacaxi, perdendo apenas para a Tailândia. A fusariose do abacaxizeiro é a doença mais grave dessa cultura no Brasil, causando podridão dos tecidos afetados acompanhada por exsudação de substâncias gomosas (Matos; Cabral, 2005). Fusarium guttiforme é o agente etiológico da fusariose, que constitui séria ameaça à abacaxicultura. Uma das alternativas de controlar a proliferação do Fusarium é através do controle biológico. As bactérias láticas apresentam grande potencial para inibição do crescimento fúngico, assim como quanto à detoxificação de micotoxinas. Essa atividade antimicrobiana pode estar associada à competição por nutrientes, à produção dos ácidos lático, orgânico e acético, além da produção de peróxido de hidrogênio, um importantíssimo agente antagônico (FRANCO, 2010). O uso de micro-organismoss antagonistas é uma alternativa para o controle biológico, sendo este o objetivo do presente trabalho frente à fusariose do abacaxizeiro.
FLORA DA BA DE PELTOGYNE VOGEL
Authors: Silva Fernanda Gomes
Published: May 2021

Peltogyne é um gênero de Leguminosae amplamente distribuído na região neotropical, ocorrendo do México ao sudeste brasileiro (Silva, 1976). O gênero é caracterizado pelo hábito arbóreo, folhas bifolioladas, flores brancas, ovário estipitado e legumes orbiculares a triangulares, comprimidos, monospérmicos (Bentham, 1870; Silva, 1976). Bentham (1870) descreveu sete espécies para o Brasil; Silva (1976), na revisão, apresentou 23 espécies; e Lima & Cordula (2015) indicam 25 espécies, sendo seis referidas para a Bahia. Incongruências na taxonomia de Peltogyne, bem como a quantidade de material sem identificação nos herbários, apontam para a necessidade de estudos mais apurados. Aqui é apresentada a flora de Peltogyne para a Bahia.
OTIMIZAÇÃO DAS CONDIÇÕES DE CULTURA PARA O CRESCIMENTO BACTERIANO COMO PARA PRODUÇÃO DA DEXTRANA-SACARASE A PARTIR DE Leuconostoc Pseudomesenteroides
Authors: Coccorese Isabela Souza
Published: May 2021

Exopolissacarídeos de origem bacteriana têm despertado o interesse das mais variadas indústrias podendo ser utilizados para várias especialidades. A Dextrana é um dos exopolissacarídeos produzida por bactérias dos gêneros Leuconostoc, Lactobacillus e Streptococcus, pela ação da enzima Dextrana-Sacarase, que é ativada pela Sacarose (com exceção das espécies do gênero Streptococcus). A enzima utiliza a sacarose como substrato e polimeriza a dextrana. A Dextrana é um dos exopolissacarídeos de maior importância industrial, largamente utilizada como aditivo, espessante, estabilizante e emulsificante em produtos alimentícios, cosméticos, imobilizante em processos cromatográficos, e também na área médica, agindo como anticoagulante e extensor de plasma, dentre outros (Bhavani&Nisha, 2010).Muito empenho tem sido aplicado ao longo dos anos para desenvolver metodologias eficazes, rápidas e com menor custo para a produção das dextranas (Nigam et al., 2006); (Vettori et al., 2012). Assim, os estudos que se voltam para a Dextrana-Sacarase têm um papel fundamental neste processo. Dentre os benefícios desta abordagem, pode-se frisar a redução com gastos para manter a colônia, facilidade na separação final do produto com alto grau de pureza, além da possibilidade de reaproveitamento da enzima nas etapas da produção (Chiellini et al., 2001).Dessa maneira, o presente estudo se justifica, portanto, em elaborar um método eficaz na produção Dextrana-Sacarase através das bactérias láticas produtoras de exopolissacarídeos isoladas da região, afim de verificar qual o melhor meio a ser utilizado e as condições mais favoráveis para que estas cresçam mais rapidamente consequentemente obtendo eficiência na obtenção do exopolissacarídeo de grande interesse industrial.
AVALIAÇÃO DO USO DE RESÍDUO DE SERRAGEM DE PEDRA CARIRI COMO AGREGADO MIÚDO SOBRE O COMPORTAMENTO DE CAA
Authors: Queiroz Brendhy Torres
Published: May 2021

O setor da construção civil é o maior consumidor de minério de areia no Brasil, correspondendo a 62% do total consumido (VIEIRA; REZENDE, 2015). Os impactos socioambientais decorrentes da exploração desse minério, associados ao esgotamento de jazidas, tem fomentado estudos que visam incorporar resíduos, tanto da própria construção civil como de outros segmentos produtivos, na produção de argamassas e concretos.No Brasil, em 2016, as exportações de rochas ornamentais e de revestimento totalizaram aproximadamente 2,5 milhões de toneladas (ABIROCHAS, 2017). A Pedra Cariri, rocha calcária laminada cuja exploração representa a principal atividade econômica dos municípios de Nova Olinda e Santana do Cariri – CE, por conta de métodos rudimentares empregados em seu processo produtivo se gera cerca de 70% de perdas nas etapas de lavra e beneficiamento (VIDAL; PADILHA, 2003). Estima-se que sejam gerados 850 t/ano de resíduo de serragem de Pedra Cariri (RSPC), proveniente da etapa de serragem da Pedra Cariri (BASTOS, 2014).Estudos desenvolvidos anteriormente, com o intuito de avaliar o comportamento do RSPC em materiais a base de cimento, constataram que esse resíduo tem o potencial de uso como adição tipo fíler, além de elevar a coesão das misturas (SILVA, 2008; SUASSUNA et al., 2012; BASTOS, 2014; GUIMARÃES, 2014; GALVÃO et al., 2016; MERCÊS; MOURA, 2016; FARIAS, 2017).Assim, esse estudo tem como objetivo avaliar a substituição parcial de agregados miúdos por RSPC em concretos autoadensáveis (CAA), verificando sua influência sobre os parâmetros de autoadensibilidade e resistência mecânica.