Automorphisms of Algebraic Curves

Στην παρούσα διατριβή μελετώνται οι αυτομορφισμοί αλγεβρικών καμπυλών επί σωμάτων θετικής χαρακτηριστικής. Μετά από μια σύντομη περιγραφή μιας κλάσης καμπυλών γνωστών ως καμπύλες Harbater-Katz-Gabber αποδεικνύεται μια σειρά νέων αποτελεσμάτων για αυτές τις καμπύλες. Στη συνέχεια υπολογίζεται το κανονικό ιδεώδες μιας τέτοια καμπύλης. Στις τελευταίες παράγραφους δίνονται αποτελέσματα που αφορούν γενικές αλγεβρικές καμπύλες και σχετίζονται με το κανονικό ιδεώδες και με τη θεωρία των συζυγιών.In this dissertation automorphisms of algebraic curves in positive characteristic are studied. After a brief outline of a class of curves known as Harbater-Katz-Gabber curves, some new results regarding these curves are proven. After that the canonical ideal of such a curve is calculated. In the last paragraphs we present results concerning general algebraic curves and are related to the canonical ideal and the theory of syzygies

Infected pancreatic necrosis: outcomes and clinical predictors of mortality. A post hoc analysis of the MANCTRA-1 international study

: The identification of high-risk patients in the early stages of infected pancreatic necrosis (IPN) is critical, because it could help the clinicians to adopt more effective management strategies. We conducted a post hoc analysis of the MANCTRA-1 international study to assess the association between clinical risk factors and mortality among adult patients with IPN. Univariable and multivariable logistic regression models were used to identify prognostic factors of mortality. We identified 247 consecutive patients with IPN hospitalised between January 2019 and December 2020. History of uncontrolled arterial hypertension (p = 0.032; 95% CI 1.135-15.882; aOR 4.245), qSOFA (p = 0.005; 95% CI 1.359-5.879; aOR 2.828), renal failure (p = 0.022; 95% CI 1.138-5.442; aOR 2.489), and haemodynamic failure (p = 0.018; 95% CI 1.184-5.978; aOR 2.661), were identified as independent predictors of mortality in IPN patients. Cholangitis (p = 0.003; 95% CI 1.598-9.930; aOR 3.983), abdominal compartment syndrome (p = 0.032; 95% CI 1.090-6.967; aOR 2.735), and gastrointestinal/intra-abdominal bleeding (p = 0.009; 95% CI 1.286-5.712; aOR 2.710) were independently associated with the risk of mortality. Upfront open surgical necrosectomy was strongly associated with the risk of mortality (p < 0.001; 95% CI 1.912-7.442; aOR 3.772), whereas endoscopic drainage of pancreatic necrosis (p = 0.018; 95% CI 0.138-0.834; aOR 0.339) and enteral nutrition (p = 0.003; 95% CI 0.143-0.716; aOR 0.320) were found as protective factors. Organ failure, acute cholangitis, and upfront open surgical necrosectomy were the most significant predictors of mortality. Our study confirmed that, even in a subgroup of particularly ill patients such as those with IPN, upfront open surgery should be avoided as much as possible. Study protocol registered in ClinicalTrials.Gov (I.D. Number NCT04747990)

Αυτομορφισμοί αλγεβρικών καμπυλών

In this dissertation automorphisms of algebraic curves in positive characteristic are studied. After a brief outline of a class of curves known as Harbater-Katz-Gabber curves, some new results regarding these curves are proven. In particular the canonical ideal of such a curve is calculated. In the last paragraphs we present results concerning general algebraic curves and are related to the canonical ideal and the theory of syzygies.Στην παρούσα διατριβή μελετώνται οι αυτομορφισμοί αλγεβρικών καμπυλών επί σωμάτων θετικής χαρακτηριστικής. Μετά από μια σύντομη περιγραφή μιας κλάσης καμπυλών γνωστών ως καμπύλες Harbater-Katz-Gabber προκύπτει μια σειρά νέων αποτελεσμάτων για αυτές τις καμπύλες. Στη συνέχεια υπολογίζεται το κανονικό ιδεώδες μιας τέτοιας καμπύλης. Στις τελευταίες παραγράφους δίνονται αποτελέσματα που αφορούν γενικές αλγεβρικές καμπύλες και σχετίζονται με το κανονικό ιδεώδες και με τη θεωρία των συζυγιών

Ανατομικές παραλλαγές του μείζονος θωρακικού πόρου και η χειρουργική τους σημασία στις επεμβάσεις θώρακος και τραχήλου

Ο μείζων θωρακικός πόρος αποτελεί το κυριότερο λεμφαγγείο του ανθρώπινου σώματος. Ο ρόλος του είναι να επιστρέφει το μεγαλύτερο μέρος της λέμφου στην φλεβική κυκλοφορία. Η ανατομία του έχει απασχολήσει πολλές φορές την ιατρική κοινότητα, ενώ πληθώρα μελετών και νεκροτομών έχουν διεξαχθεί προκειμένου να περιγράψουν την πορεία και τις ανατομικές παραλλαγές που εμφανίζει. Ωστόσο, τα αποτελέσματα που απορρέουν από αυτές τις εργασίες εμφανίζουν αρκετές διαφορές μεταξύ τους. Αυτό υποδεικνύει την σημασία της καλής γνώσης της ανατομίας του μείζονος θωρακικού πόρου από τους σύγχρονους χειρουργούς, καθώς η τρώση του μείζονος θωρακικού πόρου, παρότι σπάνια, είναι μία πιθανή επιπλοκή στις επεμβάσεις τραχήλου και θώρακος, η οποία μπορεί να αποβεί μοιραία για τον ασθενή, εάν δεν διαγνωσθεί έγκαιρα και δε ληφθούν τα απαραίτητα θεραπευτικά μέτρα.Major thoracic duct is the greatest lymphatic of human body. Its function is to return the biggest part of lymph to the venous circulation. Anatomy of major thoracic duct has concerned medical society many times, and lots of studies and cavaderic autopsies have been conducted in order to describe the course and anatomic variations of it. However, the results derived from these studies show many differences. Immense knowledge of anatomy of major thoracic duct is crucial for modern surgeons, since the damage of major thoracic duct, while unusual, can be a possible complication of neck and thoracic operations, which can be fatal for the patient, if the appropriate diagnosis and treatment are not conducted in time

A generating set for the canonical ideal of HKG-curves

The canonical ideal for Harbater Katz Gabber covers satisfying the conditions of Petri's theorem is studied and an explicit non-singular model of the above curves is given

Left Functional Pneumonectomy Caused by a Very Rare Giant Intrathoracic Cystic Lesion in a Patient with Gorham–Stout Syndrome: Case Report and Review of the Literature

Gorham–Stout syndrome is an uncommon entity, with few cases reported in bibliography. It consists of osteolytic manifestations affecting various bones and replacing them with lymphangiomatous tissue. With pathophysiology unknown, Gorham–Stout disease affects also cardiorespiratory system usually causing lytic lesions to the bones of the thoracic cage or directly invading the thoracic duct. This is a case report of a unique respiratory manifestation of the disease and a review of its cardiorespiratory complications

Left Functional Pneumonectomy Caused by a Very Rare Giant Intrathoracic Cystic Lesion in a Patient with Gorham-Stout Syndrome: Case Report and Review of the Literature.

Gorham-Stout syndrome is an uncommon entity, with few cases reported in bibliography. It consists of osteolytic manifestations affecting various bones and replacing them with lymphangiomatous tissue. With pathophysiology unknown, Gorham-Stout disease affects also cardiorespiratory system usually causing lytic lesions to the bones of the thoracic cage or directly invading the thoracic duct. This is a case report of a unique respiratory manifestation of the disease and a review of its cardiorespiratory complications