Summary. This study examines the attitudes of Greek teachers towards Europe in relation with their national identity. Because of the Greek debt crisis and Greece's entry into the IMF and EFSM mechanisms, two successive studies were conducted using the same questionnaire (the first with 1036 and the second with 482 teachers from all over Greece in 2009 and 2011 respectively). A two-step cluster analysis was performed and four particular dimensions were identified. The statistical analysis showed that there is a shift away from a European orientation, a finding that is attributed to economic difficulties.

In 33 children, 23 with acute lymphoblastic leukemia (ALL) and 10 with solid tumors, the phenotype of the enzyme adenosine deaminase (ADA) was detected in the erythrocytes by electrophoresis in cellulose acetate. In all children the ADA enzyme activity was also determined in the plasma by spectrophotometry at the onset of the disease, during remission, at the end of the therapy, and during relapse. The phenotype in all children was ADA1-1. There was a difference in enzyme activity between the mean values of children with ALI and those with solid tumors. There were also differences among the subtypes of ALL and also among the stages of ALL and the stages of solid tumors. In 23 children with ALL the mean value (MV) and the corresponding standard error (SEM) of enzyme activity at the onset of the disease were MV +/- SEM = 60.2 +/- 6.2 IU/L. This was higher than that of the control group (control group: MV +/- SEM = 27.8 +/- 3.3 IU/L). During remission the enzyme activity was lower than that of the control group (MV +/- SEM = 19.6 +/- 1.7 IU/L); at the end of the therapy it was MV +/- SEM = 24.0 +/- 1.3 IU/L, which is close to that of the control group; and during relapse it was much higher compared with the control group (MV +/- SEM = 73.1 +/- 4.6 IU/L). These values are discussed in connection to the leukaemic subtypes. In 10 children with solid tumors the mean value of enzyme activity at the onset of the disease was MV +/- SEM = 48.8 +/- 2.4 IU/L. During therapy it was MV +/- SEM = 32.4 +/- 1.9 IU/L and at the end of therapy MV +/- SEM = 22.1 +/- 2.5 IU/L. The aim of this work is to study the qualitative isoenzyme abnormalities to better understand the biological nature of the malignancies, to distinguish main groups and subsets of ALL and solid tumors on an enzymatic basis, and to identify possible sensitive key enzymes as targets for chemotherapy.

. Στην εισαγωγή γίνεται αναφορά στην πολιτική κοινωνικοποίηση των μαθητών και στη σύνδεση της εν λόγω πολιτικοποίησης τους με την επιλογή της κατάληψης του σχολείου ως μορφής μη συμβατικής πολιτικοποιημένης διαμαρτυρίας. Στόχος της έρευνας είναι η διερεύνηση των λόγων που υποκινούν τους μαθητές Λυκείων να διαμαρτύρονται με τον καθιερωμένο αυτόν τρόπο πολιτικής διαμαρτυρίας. Παράλληλα αναζητήθηκαν παράγοντες που επηρεάζουν τις επιλογές των μαθητών όπως το φύλο, η τάξη στην οποία ανήκουν και το μορφωτικό επίπεδο των γονέων. Χρησιμοποιήθηκε ερωτηματολόγιο το οποίο συμπλήρωσαν μαθητές Λυκείου από σχολεία των νομών Κατερίνης και Θεσσαλονίκης. Αναλύθηκαν τρεις αιτίες οι οποίες υποθετικά συνδέονται με τις καταλήψεις των σχολείων: αιτήματα για βελτίωση της καθημερινότητάς τους, πολιτικοί και ιδεολογικοί λόγοι και εξωτερικοί λόγοι που δεν σχετίζονται με τη σχολική ζωή. Το σημαντικότερο εύρημα της έρευνας είναι το γεγονός ότι οι καταλήψεις δεν υποκινούνται τόσο από ιδεολογικά κριτήρια αλλά είναι μία προσπάθεια των μαθητών να ευαισθητοποιήσουν την κοινή γνώμη για τα καθημερινά τους προβλήματα. Επίσης διαφοροποιήσεις παρατηρήθηκαν ανάμεσα στα φύλα των μαθητών, με τα κορίτσια να παρουσιάζονται πιο συνειδητοποιημένα από τα αγόρια. Λέξεις-κλειδιά: καταλήψεις σχολείων, μαθητές, πολιτική κοινωνικοποίηση AbstractThis paper presents a postdoc research that was carried out in autumn 2015 by school of Politics of Aristotle University of Thessaloniki about the students' sit-ins at secondary education schools. In the introduction, the notion of political socialization is explained and it is associated with the students' option to sit-in their schools as a form of unconventional political demonstration. Also, the legitimacy of sit-ins is questioned according to the laws that recently were voted by the Greek parliament. The purpose of this research was to examine the factors 1 Η έρευνα αυτή εκπονήθηκε στο πλαίσιο μιας μεταδιδακτορικής έρευνας στο Τμήμα Πολιτικών Επιστημών του ΑΠΘ.