bluuebunny/crossref_metadata_2025 huggingface dataset:
Live yeasts accelerate Drosophila melanogaster larval development
Authors: Jiménez-Padilla Yanira , Adewusi Babafemi , Lachance Marc-André , Sinclair Brent J.
Published: September 2024

Insect guts house a complex community of microbes that affect host physiology, performance and behavior. Gut microbiome research has largely focused on bacteria–host symbioses and paid less attention to other taxa, such as yeasts. We found that axenic Drosophila melanogaster (reared free of microbes) develops from egg to adult more slowly (ca. 13 days) than those with a natural microbiota (ca. 11.5 days). Here, we showed that live yeasts are present and reproducing in the guts of flies and that the fast development time can be restored by inoculating larvae with a single yeast species (either Saccharomyces cerevisiae or Lachancea kluyveri). Nutritional supplements (either heat-killed yeasts, or a mix of essential vitamins and amino acids) slightly sped the development of axenic flies (to ca. 12.5 days), but not to the same extent as live yeasts. During the first two instars, this acceleration appears to result from additional macronutrient availability, but during the third instar, when most growth occurs, live yeasts increased feeding rate, implying an effect mediated by the gut–brain axis. Thus, the fly–yeast interaction extends beyond yeasts-as-food to yeasts as beneficial interactive symbionts.
Η οικοδομική δραστηριότητα στο Βυζάντιο με το βλέμμα του νομικού
Authors: ΠΑΠΑΓΙΑΝΝΗ (Eleftheria PAPAGIANNI) Ελευθερία
Published: September 2024

Ἀναλύονται νομοθετικά κείμενα τῆς πρώιμης καί μέσης βυζαντινῆς περιόδου, κυρίως ἡ διάταξη τοῦ αὐτοκράτορα Ζήνωνα, Νεαρές τοῦ Ἰουστινιανοῦ, ἡ Νεαρά 113 τοῦ Λέοντος ΣΤ΄ καί ὁ 22ος Τίτλος τοῦ Ἐπαρχικοῦ Βιβλίου γιά τούς «ἐργολάβους». Παρουσιάζονται ἀφενός μέν ἡ μέριμνα τῶν αὐτοκρατόρων γιά τήν τήρηση τῆς πολεοδομικῆς εὐταξίας ἀλλά καί πληροφορίες γιά τρόπους παράκαμψης τῆς νομιμότητας, ἀφετέρου δέ οἰ δραστηριότητες καί οἰ εὐθύνες τῶν «ἐργολάβων», δηλαδή τῶν τεχνιτῶν πού ἀναλάμβαναν τήν ἐκτέλεση κάποιου ἔργου. Εἱδικά γιά τή Νεαρά 113 τοῦ Λέοντος, μέ ἀντικείμενο τήν προστασία τῆς ἱδιωτικῆς ζωῆς ἀπό τήν «κατόπτευση» τῶν γειτόνων, ἐκφράζεται ἡ ἄποψη πώς δέν ἀναφέρεται στή διάταξη τοῦ Ζήνωνα ἀλλά στήν ἱδιωτική συλλογή τοῦ Ἀσκαλωνίτη. Τέλος, διατυπώνονται ἀμφιβολίες γιά τήν πλήρη ἐφαρμογή τῆς νομοθεσίας στήν πράξη.
Άγνωστες φορητές εικόνες του ζωγράφου Ιωάννη, γιου του Θεοδώρου, από τη Γράμμοστα, στην Καστοριά
Authors: ΣΤΡΑΤΗ (Angeliki STRATI) Αγγελική
Published: September 2024

Στον δραστήριο ζωγράφο του πρώτου μισού του 16ου αιώνα Ιωάννη από τη Γράμμοστα, στην ευρύτερη περιοχή της Καστοριάς, αποδίδονται οι δεσποτικές εικόνες του Χριστού Παντοκράτορος, της Θεοτόκου Οδηγήτριας, του Ιωάννη του Προδρόμου και του αρχαγγέλου Μιχαήλ, που βρίσκονται ενσωματωμένες στο τέμπλο του νεότερου ναού του Αγίου Σπυρίδωνα στην Καστοριά. Στον ίδιο ζωγράφο αποδίδονται δύο ακόμη εικόνες με θέμα τον Χριστό Παντοκράτορα, που βρίσκονται στο Μουσείο της Καστοριάς, ενώ γίνεται τεχνοτροπική σύγκριση με εικόνες του ίδιου Μουσείου και του Επισκοπείου της πόλης, οι οποίες του αποδόθηκαν πρόσφατα, αλλά και αναφορά σε άλλα συναφή έργα από τα οποία αναδεικνύεται η σημασία του δραστήριου αυτού καλλιτέχνη για την περιοχή της Καστοριάς και της Αχρίδας
Iconostases ‘jumelles’ du xvie siècle à Chypre («Twin» iconostases of the 16th century in Greece)
Authors: FRIGERIO-ZENIOU Stella
Published: September 2024

After the fire of 1841 at the Monastery of Panagia Trooditissa, the 16th C. iconostasis was sawn in pieces and incorporated in the new one. During ‘reconstruction’ of the Trooditissa’s iconostasis an identical one was identified in the katholikon of the Monastery of Panagia Chryssokourdaliotissa, Kourdali, and with minor differences in style the one from the Panagia tou Sinti (Kykkos Museum). Were these iconostases created for the above churches? Did the woodcarvers constitute a local workshop or the iconostases were imported? Their dating and models? are some of the questions that arise.
Ο ναός της Παναγίας Σκριπούς στον Ορχομενό μέσα απο την αρχαιολογική έρευνα
Authors: ΚΟΙΛΑΚΟΥ (Charikleia KOILAKOU) Χαρίκλεια , ΒΟΛΤΥΡΑΚΗ (Eleftheria VOLTYRAKI) Ελευθερία
Published: September 2024

Ο ναός της Παναγίας Σκριπούς στον Ορχομενό Βοιωτίας απασχολεί πλήθος μελετητών, κυρίως χάριν του αρχιτεκτονικού του τύπου, της ακριβούς χρονολόγησης, του γλυπτού διακόσμου και λοιπών χαρακτηριστικών του, όπως η ενσωμάτωση στην κατασκευή του υλικού σε β΄ χρήση. Στο παρόν άρθρο παρουσιάζονται στοιχεία από την αρχαιολογική έρευνα που έχει πραγματοποιηθεί στον ναό και τον περιβάλλοντα χώρο του, και αρχειακές πηγές που συμβάλλουν στην περαιτέρω προσέγγιση της μακραίωνης ζωής του, φέρνοντας στο φως νέες πτυχές της ιστορίας του.
Iconographic remarks on an icon of Constantine Tzanes Bouniales depicting the Birth of the Virgin, 1676
Authors: ΤΣΙΜΠΟΥΚΗΣ (Georgios D. TSIMPOUKIS) Γεώργιος Δ.
Published: September 2024

The icon of the Birth of the Virgin, which is kept at the Monastery of the Holy Theotokos in Phiskardo, Cephalonia, is one of the few works bearing the signature of the painter Constantine Tzanes Bouniales, 1676. By comparing this icon with other surviving examples from the 17th century depicting the Birth of the Virgin (or the Birth of John the Baptist), various aspects of the iconography are discussed and an effort is made to trace the painter’s iconographic sources.
«Ο λίθος από την Κανά της Γαλιλαίας». Ιστορική περιπέτεια και πολιτική εκμετάλλευση ενός ευρήματος
Authors: ΖΑΧΟΣ (Georgios A. ZACHOS) Γεώργιος Α.
Published: September 2024

Κατά την ανασκαφή του Pierre Paris στην αρχαία Ελάτεια το 1884 ήρθε στο φως λίθος με την επιγραφή Οὗτός ἐστιν ὁ λίθος ἀπὸ Κανᾶ τῆς Γαλιλαίας, ὅπου τὸ ὕδωρ οἶνο(ν) ἐποίησεν ὁ Κ(ύριο)ς ἡμῶν Ἰησοῦς Χ(ριστό)ς. Το εύρημα ταυτίστηκε με το ανάκλιντρο στο οποίο ανεκλίθη ο Ιησούς Χριστός στην Κανά. Η ταύτιση αυτή οδήγησε στην ανάμειξη του παλατιού και κατέληξε σε επιστημονική διαμάχη. Λίγο αργότερα ο «λίθος της Κανά» θα χρησιμοποιούνταν στους γάμους του διαδόχου Κωνσταντίνου ως αγία τράπεζα.
Θεοδώρα Πετραλείφα – Άννα Παλαιολογίνα Καντακουζηνή. Δύο βυζαντινές βασίλισσες στην αυλή του Δεσποτάτου της Ηπείρου
Authors: ΠΑΠΑΔΟΠΟΥΛΟΥ (Varvara PAPADOPOULOU) Βαρβάρα
Published: September 2024

Η Θεοδώρα Πετραλείφα και η Άννα Παλαιολογίνα Καντακουζηνή αποτελούν δύο σημαντικές και δυναμικές προσωπικότητες της μεσαιωνικής Ηπείρου. Η πρώτη υπήρξε σύζυγος του Μιχαήλ Β΄ Κομνηνού Δούκα, δεσπότη του κράτους της Ηπείρου, ενώ η δεύτερη ανιψιά του αυτοκράτορα Μιχαήλ Η΄ Παλαιολόγου και σύζυγος του Νικηφόρου Α΄, γιου της Θεοδώρας. Πρόκειται για την πεθερά και τη νύφη της, οι οποίες συμμετείχαν με ποικίλους τρόπους στα πολιτικά ζητήματα του Δεσποτάτου της Ηπείρου. Στη μελέτη αυτή επιχειρείται μια προσέγγιση στη ζωή, το έργο και τη συμβολή τους στη μνημειακή τέχνη της περιοχής.
Catherine Vanderheyde, La sculpture byzantine du IXe au XVe siècle. Contexte – mise en oeuvre – décors
Authors: PALLIS (Γεώργιος ΠΑΛΛΗΣ) Georgios
Published: September 2024

Catherine Vanderheyde, La sculpture byzantine du IXe au XVe siècle. Contexte – mise en oeuvre – décors, Editions Picard, Paris 2020
Οχυρώνοντας και «κατοχυρώνοντας» τη Μεθώνη στα χρόνια του Αλεξίου Α΄ Κομνηνού. Η μαρτυρία μιας έμμετρης επιγραφής
Authors: ΚΑΠΠΑΣ (Michalis KAPPAS) Μιχάλης
Published: September 2024

Παρουσιάζεται μία έμμετρη επιγραφή από την περιοχή της Μεθώνης, που αναφέρεται στην επισκευή των τειχών της πόλης. Βάσει των χρονολογικών στοιχείων που παρέχει η επιγραφή, προτείνεται η χρονολόγησή της στο έτος 1084/85, λίγα μόλις χρόνια μετά την ανάρρηση του Αλεξίου Α΄ Κομνηνού στον θρόνο της Κωνσταντινουπόλεως. Tο φιλόδοξο αυτό οχυρωματικό έργο, από κοινού με την ίδρυση της μητροπόλεως Χριστιανουπόλεως και την οικοδόμηση του εμβληματικού επισκοπικού της ναού, φαίνεται να συνιστούν δράσεις ενός ενιαίου σχεδίου οργανωμένου από την κεντρική εξουσία, προκειμένου να ενισχυθεί το ηθικό των υπηκόων του βυζαντινού κράτους στο πλέον ευάλωτο στις νορμανδικές επιθέσεις δυτικό όριο της αυτοκρατορίας.
Ο ρόλος των δασκάλων σε Δημοτικά Σχολεία στην αξιοποίηση της Τηλεκπαίδευσης κατά τη διδακτική διαδικασία των γλωσσικών μαθημάτων την περίοδο του κορωνοϊού
Authors: Ευαγγέλου Φίλιππος , Φύκαρης Ιωάννης
Published: September 2024

Την περίοδο της πανδημίας του κορωνοϊού η εξαναγκαστική αναστολή της δια ζώσης λειτουργίας των σχολείων και η επείγουσα αξιοποίηση της Τηλεκπαίδευσης διαμόρφωσε ποικιλία στάσεων και απόψεων των εκπαιδευτικών αναφορικά με την επίδραση της Τηλεκπαίδευσης στη διδακτική και μαθησιακή διαδικασία. Στη βάση αυτή σκοπός της παρούσας εργασίας είναι η διερεύνηση του ρόλου των δασκάλων σε Δημοτικά Σχολεία στην αξιοποίηση της Τηλεκπαίδευσης κατά τη διδακτική διαδικασία των γλωσσικών μαθημάτων την περίοδο του κορωνοϊού. Το δείγμα της έρευνας αποτέλεσαν τριακόσιοι ογδόντα ένα δάσκαλοι. Για την πραγματοποίηση της έρευνας και για τη συλλογή των δεδομένων χρησιμοποιήθηκε δομημένο ερωτηματολόγιο και τα βασικά εξαγόμενα της έρευνας συνοψίζονται στα εξής: οι στάσεις και απόψεις των δασκάλων για τον ρόλο του εκπαιδευτικού - αναφορικά με την αλληλεπίδραση μεταξύ εκπαιδευτικού - μαθητών, την αξιοποίηση μεθόδων και τεχνικών διδασκαλίας - στη διδακτική και μαθησιακή διαδικασία των γλωσσικών μαθημάτων, προκύπτει ότι είναι περίπου ουδέτερες, δηλαδή ούτε θετικές ούτε αρνητικές.
Απόψεις και στάσεις εκπαιδευτικών πρωτοβάθμιας εκπαίδευσης (ΠΕ60, 70) ως προς τη χρησιμότητα και την εφαρμογή της ασύγχρονης τηλεκπαίδευσης μετά την πανδημία
Authors: Ξαφάκος Ευστάθιος Γεώργιος , Τζήλου Γεωργία , Πασιόπουλος Γεώργιος , Βάσιου Αικατερίνη
Published: September 2024

Στην παρούσα έρευνα διερευνήθηκαν οι απόψεις και οι στάσεις 118 εκπαιδευτικών πρωτοβάθμιας εκπαίδευσης ως προς τη χρησιμότητα της ασύγχρονης μορφής εκπαίδευσης μετά την πανδημία, καθώς και η αντιλαμβανόμενη αυτοαποτελεσματικότητά τους ως προς τη χρήση και την εφαρμογή της. Οι αναλύσεις των πρωτογενών δεδομένων φανερώνουν ότι το 30% των συμμετεχόντων εφάρμοσε λίγο την ασύγχρονη τηλεκπαίδευση και το 55% αναγνωρίζει τη χρησιμότητα της ασύγχρονης τηλεκπαίδευσης, με τις/τους εκπαιδευτικούς ΠΕ70 να εκφράζονται πιο θετικά σε σχέση με τις/τους εκπαιδευτικούς ΠΕ60. Επίσης, το 45,8% δηλώνει ότι είναι αποτελεσματικό ως προς την εφαρμογή της. Ακόμη, όσοι/όσες εφάρμοσαν με μεγαλύτερη συχνότητα την ασύγχρονη τηλεκπαίδευση αναγνωρίζουν σε μεγαλύτερο βαθμό τη χρησιμότητά της, καθώς επίσης εκφράζονται πιο θετικά ως προς την αντιλαμβανόμενη αυτοαποτελεσματικότητά τους. Τέλος,  εντοπίστηκε μέτρια θετική συσχέτιση μεταξύ της χρησιμότητας και της αντιλαμβανόμενης αυτοαποτελεσματικότητας.
1969 – 1979 Η εξέλιξη της εξ αποστάσεως εκπαίδευσης
Authors: Διονυσίου Δέσποινα , Λιοναράκης Αντώνης
Published: September 2024

Η τρέχουσα έρευνα έχει σκοπό να αναδείξει την κατάσταση που επικρατούσε στον τομέα της εξ αποστάσεως εκπαίδευσης τη δεκαετία του '70. Βασική πηγή της έρευνάς μας αποτέλεσαν οι ογδόντα ανακοινώσεις που παρουσιάστηκαν κατά τη διάρκεια του Διεθνούς Συνεδρίου με τίτλο "The Open University Conference on the Education of Adults at a Distance", το οποίο έλαβε χώρα στο Λονδίνο, στο Birmingham Metropole Hotel,  στις 18-25 Νοεμβρίου του 1979. Οι ανακοινώσεις αυτές είναι διαθέσιμες σε έντυπη μορφή μόνο. Στόχος μας είναι να αποτυπώσουμε τις συγγραφικές και θεματολογικές τάσεις που διαμορφώνονται στον επιστημονικό χώρο της εξ αποστάσεως εκπαίδευσης ώστε το κείμενο μας να αποτελέσει μια σημαντική συμβολή στην κατανόηση της εξέλιξης της εξ αποστάσεως εκπαίδευσης κατά τη δεκαετία του '70 και τις αρχές του '80. Τα αποτελέσματά μας προέκυψαν από τη διερεύνηση των στοιχείων της ταυτότητας των συγγραφέων-ερευνητών, συμπεριλαμβανομένων του φύλου, της χώρας προέλευσης, της επαγγελματικής τους ιδιότητας και των ερευνητικών τους ενδιαφερόντων. Οι ομιλητές του συνεδρίου κατάγονταν από διάφορες χώρες, προσφέροντας μια ποικιλόμορφη εικόνα της κατάστασης που επικρατούσε στον τομέα της εξ αποστάσεως εκπαίδευσης στις αντίστοιχες χώρες.
Δημιουργία ταινίας μικρού μήκους, το σχολείο αλλιώς...
Authors: Παπαδοπουλου Ζαφειρουλα Αλεξανδρος , Μπακόπουλος Νικολαος , Πριγκιπακης Ευαγγελος
Published: September 2024

Αυτή η έρευνα αφορά σε ένα Πρόγραμμα Αγωγής Υγείας, την δημιουργία μίας ταινίας μικρού μήκους, το οποίο πραγματοποιήθηκε στο Πειραματικό Γυμνάσιο Πατρών από την κινηματογραφική ομάδα του σχολείου, την σχολική χρονιά 2017-2018. Η ομάδα αποτελούταν από 16 μαθητές και 3 καθηγητές, τους συγγραφείς του άρθρου. Η δημιουργία της ταινίας είχε διάρκεια συνολικά 22 εβδομάδες. Για την ανάλυση των αποτελεσμάτων ενός τέτοιου προγράμματος χρησιμοποιήθηκαν τεχνικές ποιοτικής έρευνας όπως οι ομάδες διαλόγου και η παρατήρηση. Η ανάλυση των αποτελεσμάτων έδειξε ότι η δημιουργία μιας ταινίας μικρού μήκους ενέχει οφέλη για τον μαθητή σε ατομικό και κοινωνικό επίπεδο αλλά και για τους καθηγητές.
Η διαδικτυακή μάθηση στην εποχή του Covid-19: Μελέτη περίπτωσης των στάσεων των σπουδαστών της Ακαδημίας Εμπορικού Ναυτικού
Authors: Ματσούκα Μαίρη , Βαλασίδου Αρετή , Δαγδιλέλης Βασίλειος
Published: September 2024

Η εξάπλωση του covid-19 ανάγκασε τις περισσότερες χώρες να επιβάλουν υποχρεωτικά προσωρινό κλείσιμο των ιδρυμάτων τριτοβάθμιας εκπαίδευσης, με τη διαδικτυακή εκπαίδευση να προτείνεται ως λύση ανάγκης για τη συνέχεια της εκπαιδευτικής διαδικασίας. Σε αυτό το πλαίσιο, ο στόχος αυτής της μελέτης είναι να διερευνήσει τις στάσεις και τις απόψεις των σπουδαστών της Σχολής Μηχανικών της Ακαδημίας Εμπορικού Ναυτικού στη Μηχανιώνα Θεσσαλονίκης σχετικά με την εφαρμογή διαδικτυακής εκπαίδευσης κατά τη διάρκεια της πανδημίας covid-19. Η έρευνα διεξήχθη προς το τέλος του εαρινού εξαμήνου 2020 με ερωτηματολόγια σε 597 σπουδαστές και για τον έλεγχο των υποθέσεων χρησιμοποιήθηκε περιγραφική στατιστική και έλεγχος x2. Τα αποτελέσματα έδειξαν ότι η προσαρμογή των σπουδαστών στο νέο τρόπο διδασκαλίας εξαρτάται από το εξάμηνο στο οποίο βρίσκονται και από τα τεχνικά προβλήματα που πιθανόν αντιμετώπισαν. Επίσης εντοπίστηκε ένα αξιοσημείωτο φαινόμενο, ότι οι σπουδαστές που είχαν ικανοποιητική επικοινωνία με τους καθηγητές και τις καθηγήτριές τους είναι λιγότερο επιφυλακτικοί στο να καθιερωθεί η τηλεκπαίδευση ως τρόπος διδασκαλίας. Τέλος, παρόλο που συμφώνησαν ότι η διαδικτυακή μάθηση ήταν η σωστή λύση κατά τη διάρκεια της πανδημίας, τη βρήκαν πιο κουραστική από την παραδοσιακή εκπαίδευση και οι περισσότεροι σπουδαστές δεν είναι αρκετά ευχαριστημένοι από την εφαρμογή της.
Elements of unfairness in e-learning distance higher education in covid-19 era
Authors: KOUTSOUBA MARIA , KOUTSOUBA KONSTANDINA , GIOSSOS YIANNIS
Published: September 2024

Undoubtfully in covid-19 era one of the sectors seriously affected is that of education. More specifically, an issue widely discussed is that of the form of education offered to the interested parties under the new circumstances. Worldwide, at all levels of education (primary, secondary and tertiary), both educators and learners were forced by the exogenous factor of pandemic, not only to work at distance from their educational institution, but also to adjust in e-learning educational procedures in a very short time. Focusing on tertiary education, this rapid unavoidable change brought forward several educational issues and dysfunctions, as these are revealed from researchers’ publications. Though these issues and concerns are related to issues of unfairness, nevertheless this has not been pinpointed in literature. Thus, the aim of this paper is to identify which elements of unfairness are raised due to the constraints and dysfunctions occurred from the sudden change from face-to-face to online distance learning. For these purpose 15 related papers are critical reviewed. The results showed unfairness elements across countries, within countries, among universities, within universities and among students have been identified. More over two elements of unfairness have a horizontal impact in tertiary education since the beginning of the pandemic era. These unfairness issues highlighted seem that will engage the tertiary educational community and educational community in general, since distance education may become a dominant form of education in the near future. Thus, issues and concerns of fairness at distance education need to come to the proscenium.
Σχεδιασμός και Υλοποίηση ενός xMOOC για την εξ Αποστάσεως Απόκτηση Χειραπτικών Δεξιοτήτων στον Χειρισμό του Φωτονικού Μικροσκοπίου
Authors: Παξινού Ευγενία , Μητρόπουλος Κωνσταντίνος , Ζαφειρόπουλος Βασίλειος , Καλλές Δημήτριος
Published: September 2024

Σκοπός του συγκεκριμένου άρθρου είναι η παρουσίαση του τρόπου σχεδιασμού ενός Μαζικού Ανοικτού Διαδικτυακού Μαθήματος (Massive Open Online Course - MOOC) με τίτλο «Φωτονική Μικροσκοπία: Τα μέρη ενός Φωτονικού Μικροσκοπίου», στο πλαίσιο των Ανοικτών Μαθημάτων που προσφέρει το Ελληνικό Ανοικτό Πανεπιστήμιο (ΕΑΠ) μέσω της πλατφόρμας Learn. Η ιδιαιτερότητα και η συνεισφορά του συγκεκριμένου MOOC βασίζεται στο γεγονός ότι εκτός από το έντυπο εκπαιδευτικό υλικό, τα βίντεο και τα  κουίζ αξιολόγησης, προσφέρει στους εκπαιδευομένους την εμπειρία να γνωρίσουν και να εξασκηθούν στη χρήση του μικροσκοπίου αλληλεπιδρώντας με ένα εικονικό μικροσκόπιο. Η αλληλεπίδραση αυτή δίνει τη δυνατότητα στους χρήστες να αποκτήσουν με μία εξ αποστάσεως διεργασία, εργαστηριακές δεξιότητες οι οποίες παραδοσιακά διδάσκονται σε ένα εργαστήριο με τη φυσική παρουσία των εκπαιδευόμενων και του υπεύθυνου εργαστηρίου.   Ο σχεδιασμός και η υλοποίησή του πολυμορφικού υλικού του ΜΟΟC βασίστηκε στην τυπολογία West & Lionarakis η οποία παρέχει κατευθυντήριες αρχές σχετικά με την ανάπτυξη εκπαιδευτικού υλικού στην εξ αποστάσεως εκπαίδευση.  Το εν λόγω MOOC απευθύνεται σε εκπαιδευομένους που επιθυμούν να αποκτήσουν ή να ανανεώσουν τις δεξιότητές τους ως προς τον χειρισμό του φωτονικού μικροσκοπίου. Το δυνητικό του κοινό είναι ευρύ και η δυνατότητα επαναχρησιμοποίησης του συγκεκριμένου μαθησιακού αντικειμένου σε διαφορετικά εκπαιδευτικά πλαίσια τυπικής και άτυπης εκπαίδευσης, είναι μεγάλη. Ο τρόπος σχεδιασμού του συγκεκριμένου MOOC συνάδει με τη θεωρία μάθησης του συμπεριφορισμού κατηγοριοποιώντας το στα xMOOCs.  Παρότι παρέχει στον εκπαιδευόμενο δομημένες πληροφορίες, μέσω μιας βασικής δραστηριότητας προσομοίωσης το εν λόγω MOOC προωθεί  τη διάδραση, την αυτονομία και την ανεξαρτησία στη  μάθηση, συμβάλλοντας στην ανοικοδόμηση της γνώσης. Ταυτόχρονα αξιοποιεί μία τεχνολογία αιχμής, όπως είναι η εικονική πραγματικότητα, για να μεταφέρει εξ αποστάσεως και με μία καινοτόμα και σύγχρονη διδακτική προσέγγιση, χειραπτικές (hands-on) εργαστηριακές δεξιότητες.
Impact of distress and anxiety due to COVID-19 on digital addictions in university students in the third wave period
Authors: Capa-Luque Walter , Mayorga-Falcón Luz Elizabeth , Barboza-Navarro Evelyn , Martínez-Portillo Armando , Pardavé-Livia Yovana , Hervias-Guerra Edmundo , Bazán-Ramírez Aldo , Bello-Vidal Catalina
Published: September 2024

Abstract* Background Digital addictions are a major problem worldwide, which has increased considerably during the COVID-19 pandemic. In this scenario, two important impact factors to explain this problem are stress and anxiety because of COVID-19. The objective of this research was to determine the impact of distress and anxiety due to COVID-19 on digital addictions. Methods cross-sectional, explanatory study. A total of 802 students from public and private universities residing in the city of Lima and Callao (Peru), with a mean age of 21.68 (SD = 3.11), selected by convenience sampling, participated in the study. The MULTICAGE CAD-4 questionnaire, the distress scale, and the COVID-19 worry scale were applied. Results two models examined with structural equation modeling showed good fit indices (CFI and TLI > .95, RMSEA and SRMR < .06). The first model shows that the latent variables distress and anxiety due to COVID-19 have direct effects on digital addictions as a general construct (R2 = 22%). The second model shows that the exogenous latent variables (stress and anxiety) have direct effects of different magnitudes on each digital technology, so the variance explained on smartphone addiction was higher (R2 = 25%) with respect to internet (R2 = 19%) and video game addiction (R2 = 6%). It was also found that for every male, there are two females with high levels of distress and anxiety. Regarding the problematic use of smartphones and internet, there is a prevalence of 40% regardless of sex; but as for the problematic use of video games, there is a marked difference between males (18.8%) and females (2.7%). Conclusion the distress and anxiety caused by COVID-19 have a direct impact in aggravating digital addictions.
Code and Data Repository for Seamless Multimodal Transportation Scheduling
Authors: Raghunathan Arvind U. , Bergman David , Hooker John N. , Serra Thiago , Kobori Shingo
Published: September 2024

A small instance exemplifying the structure used in the paper is provided in the data folder. The collection of instances used in the paper and their description can be found in the website for the MERL Last Mile Problem Set.
Legal aspects of dying and the community nurse
Authors: Dowie Iwan
Published: September 2024

In this month's Policy column, Iwan Dowie explores the legality behind caring for those approaching end of life.
Asset sharing in healthcare sectors: part two—an examination of unintended patient outcomes
Authors: Rothert-Schnell Caroline , Böddeker Sebastian , Walsh Gianfranco
Published: September 2024

Background/Aims

Asset sharing is becoming increasingly common in the healthcare sector. However, its specific applications to the healthcare sector and the potential unintended consequences have not received adequate research attention. This is the second study in a two-part research effort looking at the unintended consequences of asset sharing, particularly when the decision to share assets is made by the healthcare service provider, rather than the service user. This study aimed to assess the potential mediating role of patients' perceptions of contamination in shared healthcare assets on patient satisfaction with the physician and the treatment decision, intention to use the service again and willingness to recommend the service to others.

Methods

This was an experimental study with 261 participants, recruited from the general population via an online crowdsourcing platform and randomly assigned to one of three conditions. All participants read a vignette scenario in which a physician recommends surgery for knee problems. In the non-sharing condition, the physician explains that the operating room is used by their practice only. In the two sharing conditions, the physician explains that the room is used by five or 10 other practices. After reading the scenarios, participants' perceived contamination was measured using a seven-item semantic scale tool. Participants' satisfaction with the physician and their treatment decision, intention to use the service again and willingness to recommend the service to others were measured using 7-point Likert scales. The SPSS macro PROCESS model 4 with Helmert coding was used to analyse the data.

Results

There was a positive association between perceived contamination and sharing with both five other practices (b=0.40; P=0.01) and 10 other practices (b=0.42; P=0.02) among participants. There were negative associations between perceived contamination and predictions of satisfaction with the physician (b=-0.30; P=0.00), satisfaction with the physician's treatment decision (b=-0.30; P=0.00), intention to use the physician's service again (b=-0.34; P=0.00) and willingness to recommend the service to others (b=-0.36; P=0.00).

Conclusions

This study indicates that perceived contamination is a key factor to consider when exploring and addressing the unintended effects of asset sharing in healthcare. Healthcare organisations should consider strategies to reassure patients and reduce the impact of perceived contamination on patients' perceptions of services that use shared assets.
A novel approach for the treatment of diabetic foot ulcers using a multimodal wound matrix: a clinical study
Authors: Simman Richard , Bakewell Suzanne J , Bell Desmond , Shuman Susan , Cheney Mary
Published: September 2024

Objective:

Innovation in wound healing, particularly regarding diabetic foot ulcers (DFUs), is needed to reverse the number of diabetes-related amputations. This study evaluated a novel approach and performance of a multimodal wound matrix in converting stalled DFUs into a healing trajectory.

Method:

Patients with either type 1 or 2 diabetes and with foot ulcers (Wagner grade 1 and 2), were screened to determine eligibility for treatment. Ulcers improving >30% in area during a two-week screening phase were not eligible for the study treatment phase. The study was an open-label trial conducted in three phases: screening, treatment and healing confirmation. Patients enrolled in the study received a treatment protocol that included application of a wound matrix to the ulcer and offloading.

Results:

A total of 19 patients (15 males, four females) with a median age of 60 years, and a median ulcer duration of 36 weeks took part in the study. Patients showed an average four-week percentage area reduction (PAR) of 62%, a 12-week PAR of 94%, and a 12-week healing rate of 57% (8/14).

Conclusion:

Results of this study support the viability and potential of a novel approach to treating DFUs that includes use of a multimodal wound matrix.
The Characteristics of the Subject and Relationship between the Intention to Use Hospice and Allowance of Pre-accession based on the Advance Directives Registered by Korean Medicine Clinic
Authors: Yoon Hae-chang , Cho Junghyo
Published: September 2024

Background: In the Republic of Korea, the implementation of the Life-Sustaining Treatment Decision System has facilitated end-of-life care planning through advanced directives. Despite the availability of this system, there are few studies about advance directives itself and Korean medicine clinics(KMC) have been underrepresented as registration institutions, with limited data on their involvement.Objective: The study delved into the landscape of advance directives within KMC, shedding light on the characteristics of the subject and the correlation between sociodemographic factors with the intention to use hospice and the allowance of pre-access.Results: Data from a specific KMC's advance directives registry were analyzed, with 89 cases meeting the criteria for investigation. Results revealed a predominant female presence among registrants, with an average age of 70.28 ± 9.47 years. While no statistically significant relationship was found between gender/age/distance and the intention to use hospice or pre-access allowance, those expressing a desire for hospice care were more inclined to permit pre-access. In addition, the closer the distance, the older the subject. These findings underscore the evolving dynamics of end-of-life care planning in Korea, urging greater participation of KMC in hospice palliative care initiatives. The study's limitations include its single-institution focus and potential impact from the COVID-19 pandemic.Conclusion: The study found a strong link between hospice intention and pre-access allowance and highlighted the association between distance and age. These findings emphasized the evolving role of KMC in end-of-life care planning and call for further research to explore their increasing involvement in hospice palliative care initiatives.
Acute toxicity and genotoxicity assessment of Ligigeopoong-san
Authors: Jo Sung-Young , Hwang Sung-Min , Kim Su-Yeong , Kim Jun-Sub , Woo Kyeong-Wan , Cho Hyun-Woo , Nho Jong-Hyun
Published: September 2024

Objectives: This study aimed to investigate whether Ligigeopoong-san induces acute toxicity and genotoxicityMethods: Ligigeopoong-san contains the rhizome of Cnidium officinale MAKINO, an herb with potential teratogenicity. Teratogenicity is closely associated with genotoxicity. We analyzed whether Ligigeopoong-san induces acute toxicity and genotoxicity using various experimental models in accordance with Korean non-clinical test standards for pharmaceuticals and OECD test guidelines.Results : When Ligigeopoong-san was administered as a single dose to male and female rats, no toxic reactions, including organ damage, were observed at doses up to 2,500 mg/kg. In the bacterial reverse mutation test, no DNA mutations were detected at concentrations up to 5,000 μg/plate. In cell models, Ligigeopoong-san did not induce structural or numerical chromosomal aberrations at concentrations up to 2,000 μg/mL. Additionally, in animal studies, it did not cause bone marrow toxicity or form micronuclei in erythrocytes at doses up to 2,000 mg/kg.Conclusions : The experiments using various models demonstrated that Ligigeopoong-san did not induce acute toxicity or genotoxicity.
A study on the improvement for the classification of Korean Medicine industry
Authors: Hyun Eunhye , Park Ji-Eun , Park Yooseon , Lim Byungmook
Published: September 2024

Objectives: This study aims to develop a revised classification system of the Korean Medicine (KM) industry that is practically feasible, ultimately laying the groundwork for the KM industry's development.Methods: The draft of classification structure and categories were established through review of literature on existing classification systems related to KM or industry. The experts who affiliated to representative organizations on KM industry were invited to conduct reviews for enhancing the draft’s practical validity and usability. The review process was iterated until consensus was achieved among the experts, ensuring the revised classification was comprehensive and robust.Results: Three drafts were created in total, and the final revised classification system consisted of the ‘KM industry’ and the ‘KM-related industry’ (indirectly related or supportive of the KM industry). The ‘KM industry’ includes KM medicaments, KM medical instruments and appliances, and KM healthcare service. The ‘KM-related industry’ includes KM research, KM administration, KM education, and KM organization. Two key points emerged from the open feedback: the necessity of establishing new sectors within the KM industry and the need for further research on methods to link these new sectors with existing statistical data.Conclusions: The revised classification system of the KM industry developed in this study can serve as an important foundational resource for policymakers, researchers, and industry practitioners in the relevant field, supporting their research and policy development.
The Clinical Suggestion of Seunggi-Tang by Reviewing Therapeutic Methods
Authors: Jang Eunsu , Han Woojin , Heo Wonyoung
Published: September 2024

Objectives: The purpose of this study was to suggest the another Method of Treatment of Seunggi-Tang by reviewing ShanHanZaBingLun GuiLinGuBonMethods: The book of ShanHanZaBingLun GuiLinGuBon published by the Eui-Seong-Dang in 2004 was used. All Seunggi-tang was researched and classified into Method of Treatment.Results: Seunggi-tang included Doinseunggi-tang, Soseunggi-tang, Jowiseunggi-tang, and Daeseunggi-tang. There were two methods of using Seunggi-tang: the Ha treatment with usual volume and the Hwa treatment, with reduced volume. Seunggi-tang especially Soseunggi and Jowiseunggi-tang, were used not only as the Ha treatment but also as the Hwa treatment for several diseases such as gastrointestinal diseases with Bokman or Chogyeonghudang.Conclusions: This study reveals that Seunggi-Tang could be used Ha or Hwa treatment and Hwa treatment could be utilized in various clinical situation. Further study is needed.
Analyzing Trend of Clinic-Level Medical Institutions and Pharmacy Name Using Text Mining Technique
Authors: Lee Inseong , Kim NamKwen
Published: September 2024

Objectives: This study aimed to analyze trend of names of clinic-level medical institutions and pharmacy in Korea to understand interaction between health care provider and consumer.Methods: This study analyzes 60,101 medical clinic names, 27,609 dental clinic names, 25,506 Korean medicine clinic names, and 68,032 pharmacy names. Official records from Korea Local Information Research & Development Institute, data from 1946 to June 2024. Researcher uses text-mining technique including tokenizer of Soynlp and wordcloud to visualize trends.Results: In pharmacy business names, franchise name ‘Onnuri’ is dominant. In case of dental clinic and Korean medicine clinic, university names like ‘Seoul’, ‘Yeonsei’, ‘Kyunghee’ are dominant. Similarly, medical clinic names include university names but also teaching hospital names like ‘Samsung’ or ‘Seongmo(St. Mary)’. Commonly used word in clinic-level medical institution and pharmacy is ‘Uri’ and latest trend words are ‘Bareun’ and ‘365’.Conclusions: Methods presented in this study for analyzing business names can directly applied to the study of business names in other industries. The results of this study would develop marketing strategies of medical industry. Furthermore, since business name provide concentrated data on market perception and the interaction between consumers and providers, they can be useful for sociology and medical humanities researchers.
Analysis of the Status of Convalescent Hospitals Certified from January to March 2024: Focus on Korean Medicine Services
Authors: Yoon Hae-chang , Lee Sundong
Published: September 2024

Background: The Republic of Korea has maintained a stable number of convalescent hospitals; however, the presence of Korean Medicine(KM) doctors in such establishments has increased. Despite this trend, it is hard to find the recent researches on KM within convalescent hospitals. Objective: This study aimed to investigate the current status of convalescent hospitals, particularly focused on patient characteristics and the provision of KM.Method: Data were obtained from the Health Insurance Review&Assessment Service, relying on the Korea Institute Healthcare Accreditation, spanning from January to March 2024. Analysis was conducted through the categorization of in-patients and the provision of KM, utilizing R software.Results: Among the 143 convalescent hospitals, the majority(83.9%) provided KM, with 43.4% of them located near Seoul. Convalescent hospitals offering KM were characterized by a higher number of doctors(p=0.003) and a greater total bed number(p<0.001). The hospitals with KM specializing in dementia care located near Seoul and exhibited a higher proportion of doctors, total beds(p=0.010), uninsured beds, grade of certification evaluation(Gr) and supported activities of daily living(ADL)(p<0.001, respectively). However, the hospitals with KM specializing in cancer care had higher rate of doctors(p=0.036), total beds, uninsured beds, Gr, and average daily out-of-pocket per person and lower levels of self ADL(p<0.001, respectively). In addition, the hospitals with specialists in KM belonging to dementia care only located near Seoul(p=0.042) and exhibited a higher rate of total beds(p=0.007).Conclusion: These findings indicate significant differences among convalescent hospitals based on patient characteristics and the provision of KM. Consequently, such distinctions merit consideration in future studies.
A survey on the perception of the role of public health doctors of Korean medicine due to regional health care gaps
Authors: Choi Eunyoung , Jeong Hyein , Kwon Harin , Shim Soobo , Lee Hyelim , Kim Kyeong Han
Published: September 2024

Objectives: This study aims to understand the current state of regional healthcare services and explore the role of public health doctors of Korean medicine (PHDKMs) in addressing healthcare disparities.Methods: An online survey was conducted among 951 PHDKMs registered with the Korean Public Health Korean Medicine Doctors Association from July 15 to July 19, 2024. A total of 266 responses were collected, and after removing 2 insincere responses, 264 responses were used for analysis. The survey included questions on the provision of healthcare services and the role of PHDKMs in local healthcare crisis.Results: Out of 264 responses, 85 community health centers and branches (32.2%) lacked public health doctors (PHDs). The traveling clinics were the most common alternative in these cases. Centers without PHDs received 46 complaints (54.1%) about healthcare gaps, while centers with PHDs received 70 complaints (39.1%), showing statistically significant differences. The most common complaints involved consultation and management of chronic elderly diseases. PHDKMs reported being capable of providing musculoskeletal and internal medicine treatments, but identified a need for improvement in emergency response, basic and inflammatory treatments, consultation and management of chronic elderly diseases, administration of medications, and vaccinations. They expressed a high willingness and perceived capability to perform minor medical tasks.Conclusion: The decline in PHDs is adversely affecting regional healthcare. PHDKMs can help address these gaps through expanded roles and additional training. Policymakers should consider better integrating PHDKMs into the public healthcare system to ensure continuous and comprehensive healthcare services in underserved areas.
Principle of major acupoints composition: focus on Four Command and Star Twelve points
Authors: Yoon Da-Eun , Moon Heeyoung , Ryu Yeonhee , Chae Younbyoung
Published: September 2024

Objectives: In order to select proper acupoints, it is important to understand the principle of major acupoints composition among 361 acupoints.Methods: We investigated the composition of major acupoints from Four Command points to Star Twelve points based on the classical medical texts. We reviewed the common principle of major acupoints composition.Results: First, major acupoints are chosen to treat the targeted diseases associated with the corresponding meridian channels and these acupoints are located in distal part of the body below the knee and the elbow. Second, main acupoints are supposed to be the representative points among acupoints with similar indications. Main acupoints can be selectively to treat a specific disease or condition, rather than be used for general effect simultaneously.Conclusions: We demonstrated the major acupoints from classical medical texts and revealed the common principles of major acupoints composition. These findings can help Korean medical doctors to choose more appropriate acupoints by understanding the principle of major acupoints composition.
Performance of Fitbit Devices as Tools for Assessing Sleep Patterns and Associated Factors
Authors: Park Ji-Eun , Ahn Eun Kyoung , Yoon Kyuhyun , Kim Jayeun
Published: September 2024

As sleep duration and quality are associated with various diseases, many devices have been developed to assess sleep. We reviewed the devices used to assess sleep and their performance, focusing on Fitbit, one of the most popular devices for tracking sleep. Although previous studies have reported conflicting results regarding Fitbit’s estimation of the sleep index, most studies have shown that it has acceptable accuracy and high sensitivity. Its performance could be affected by various factors such as participants’ sleep characteristics, sleep hours and stages, analysis methods, devices compared, device models and settings, and the dominant/non-dominant wrist wearing the device. Therefore, these factors should be considered when using Fitbit to assess sleep patterns.
The Intricacies of Insomnia: A Comprehensive Exploration
Authors: Khara Nimit , Apte Anagha , Vyas Yagnang , Prajapati Dhaval , Kshatriya Ravish , Patel Sateesh
Published: September 2024

Insomnia is a pervasive and often debilitating sleep disorder that profoundly affects health and overall wellbeing. This comprehensive review focuses on the historical context, clinical significance, diagnostic criteria, investigative methods, and global treatment guidelines for insomnia. Historically, references to insomnia have appeared in ancient Egyptian and Greek texts, but it was not until the 19th century that they were rigorously studied and classified. Notable individuals, including Vincent van Gogh, Franz Kafka, and Marilyn Monroe, have struggled publicly with insomnia, underscoring its widespread nature. The pathophysiology of insomnia is multifactorial, involving physiological, psychological, and environmental factors. Hyperarousal, dysregulation of the sleep-wake cycle, and neurotransmitter imbalances are central to its development. Insomnia can be categorized into acute, chronic, comorbid, idiopathic, and behavioral types. Epidemiological studies have revealed that up to 30% of adults experience insomnia, with a higher prevalence among women, older adults, and those with a lower socioeconomic status. Insomnia is associated with adverse health outcomes, including cardiovascular diseases, metabolic disorders, cognitive impairment, and increased mortality risk. The COVID-19 pandemic has exacerbated insomnia owing to stress and lifestyle changes. Diagnosis involves a comprehensive assessment, including sleep history, physical examination, and objective evaluations, such as polysomnography. Treatment combines pharmacological and non-pharmacological interventions with cognitive behavioral therapy for insomnia as the first-line approach. Pharmacotherapy includes benzodiazepines, non-benzodiazepine hypnotics, antidepressants, melatonin, and orexin receptor antagonists. Guidelines from the American Academy of Sleep Medicine and the European Sleep Research Society emphasize individualized, evidence-based treatment plans to improve sleep quality and overall health.
Clinical Characteristics, Comorbidities, and Quality of Life in Korean Patients With Narcolepsy: Findings From an Online Survey
Authors: Kim Namoh , Min Se-yeon , Jung Ki-Young
Published: September 2024

Objectives: Narcolepsy is a chronic neurological disorder characterized by excessive daytime sleepiness and abnormal rapid eye movement sleep, both of which significantly impact daily functioning and quality of life. This study aimed to examine the clinical characteristics, comorbidities, diagnostic delays, and quality of life of Korean patients with narcolepsy through a comprehensive nationwide survey.Methods: An online survey targeting members of the Korea Narcolepsy Association was conducted between July and October 2023. The survey collected demographic information, clinical characteristics, comorbid conditions, diagnostic tools, and quality of life assessments using the World Health Organization Quality of Life-BREF (WHOQOL-BREF).Results: A total of 299 individuals participated in the study, with a mean age of 32.2 years. The average diagnostic delay was approximately 11 years, with initial symptoms appearing at a mean age of 16.6 years. Excessive daytime sleepiness was the most common initial symptom. The most frequent comorbidities included depression, obstructive sleep apnea, and anxiety disorders. WHOQOL-BREF scores indicated a moderately low quality of life across all domains, with patients having narcolepsy type 1 experiencing more severe symptoms and lower quality of life scores than those of patients having narcolepsy type 2. Higher education levels, marital status, and regular exercise were positively associated with better WHOQOL-BREF scores, whereas depression, older age, and poor sleep quality were negatively associated.Conclusions: The findings from this survey underscore the lower quality of life, with notable delays in diagnosis and a high prevalence of comorbid conditions. The results suggest a need for improved awareness, timely diagnosis, and comprehensive management strategies that address both the primary symptoms of narcolepsy and its associated comorbidities.
Lateral Epicondylitis Treated with Platelet-Rich Plasma Injection and Corticosteroid Injection
Authors:   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India., Krishnan M Sowbhikh , Ashwin V Y ,   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India., Pandian Haemanath ,   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India., Kumar K V Arun ,   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India., Sheik Mohideen ,   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India., Dondapat Ashwini ,   Department of Orthopaedic Surgery, Chettinad Hospital and Research Institute, Rajiv Gandhi Salai, Kanchipuram, Tamil Nadu, India.
Published: September 2024

Introduction: Lateral epicondylitis, or tennis elbow, affects 1%–3% of adults aged 35–50, causing pain and weakness in the dominant elbow due to chronic inflammation of the extensor tendon. While corticosteroid injections (CSI) are commonly used for treatment, they offer only short-term relief. Platelet-rich plasma (PRP) is a promising alternative with potential for long-term benefits. This study compares the efficacy of PRP and CSI in treating lateral epicondylitis. Materials & Methods: A randomized controlled trial was conducted at Chettinad Hospital and Research Institute from February 2020 to March 2021, involving patients with lateral epicondylitis unresponsive to non-invasive treatments. Patients were randomly assigned to receive either PRP or CSI, with pre- and post-treatment pain and function assessed using VAS, PSFS, and PRTEE scores. Results: PRP showed better long-term pain reduction and functional improvement than CSI. At 6 months, PRP-treated patients had significantly lower VAS and PRTEE scores, indicating superior outcomes. Discussion: Although CSI provided quicker initial relief, PRP demonstrated sustained benefits at 3 and 6 months. PRP's effectiveness in promoting tissue healing may explain its long-term success. Conclusion: PRP is more effective than CSI for long-term management of lateral epicondylitis, offering superior pain relief and functional improvement. Keywords: Lateral epicondylitis, platelet-rich plasma injection, corticosteroid injection, Cozen’s test
Biological status of blue swimming crab population (Portunus pelagicus) in Estuarine Water at Langsa City
Authors: Sari Nurdian Novita , Febri Suri Purnama , Putriningtias Andika , Haser Teuku Fadlon , Rusydi Rachmawati , Hanisah Hanisah , Nazlia Suraiya , Aprita Ika Rezvani
Published: September 2024

Many factors encourage the exploitation of the blue swimming crab in the estuarine water of Langsa City. Therefore, maintaining crab populations in nature through fishing regulation becomes an important effort. Evaluation of the biological aspects of the blue swimming crab population the  estuarine waters of Langsa City has the main role in the  arrangement of regulation. This study aimed to determine the biology of the blue swimming crab population in the estuarine waters of Langsa City. This research was carried out in August 2022 in the estuarine waters of Langsa City. The method used was the survey method. The crab samples were taken randomly from the crab fishermen as much as 10% of the catch. Sampling once a week at 2 different location points for 1 month. The results showed that the relationship between carapace width and weight of male and female blue swimming crabs (Portunus pelagicus) had a negative allometric growth pattern because of the value of b 3, namely 1.22 and 1.21. The sex ratio of blue swimming crabs was not 1:1 or unbalanced. Gonadal maturity of male crabs was highest in level I, meanwhile the female could achieve the gonadal maturity in level V. During the research, the water quality of estuarine waters was in optimum condition.Keywords:Blue swimming crabBiological aspectEstuarinePopulation