Control of Properties of Diesel/ Biodiesel, in high Concentrations of Biodiesel

95 σ.Στην εργασία αυτή έγινε έλεγχος των κυριότερων ιδιοτήτων μιγμάτων ντήζελ/ βιοντήζελ, σε υψηλές περιεκτικότητες βιοντήζελ. Η συνεχής αύξηση της απαιτούμενης περιεκτικότηας των καυσίμων σε βιοντήζελ οδηγεί στην ανάγκη εξερεύνησεις των ιδιοτήτων αυτών των μιγμάτων, ώστε το τελικό καύσιμο να είναι εντός των περιβαλλοντικών ορίων αλλά να ικανοποιεί παράλληλα και τις λειτουργικές ανάγκες του κινητήραDuring this thesis there were tested the most importan properties of the diesel/ biodiesel mixtures, containing high percentages of biodiesel. The continious increase of the required content of biodiesel in the market fuel, leads to the necessary further research of the properties of these mixtures, in order to have a fuel within environmental limits which satisfies at the same time the operational needs of the engine.Ευαγγελία Θ. Κοντόζογλο

FAMILIAL CALCIFICATION OF AORTA AND CALCIFIC AORTIC-VALVE DISEASE-ASSOCIATED WITH IMMUNOLOGICAL ABNORMALITIES

We report three patients of the same family with linear calcification of the ascending aorta, severe calcific mixed aortic valve disease associated with increased levels of globulins, lambda-chain gammopathy, an increased T4/T8 lymphocyte ratio, and other immunologic abnormalities. None of the patients had syphilis, atherosclerosis, abnormalities of calcium or phosphorus metabolism, lymphadenopathy, or other systemic diseases. It is postulated that these cases and some previously reported in the literature as idiopathic represent a distinct pathologic entity, familial or sporadic, in which localized vascular and valvular calcific disease is associated with an underlying immunologic disorder or autoimmune process

Myofibroblastoma of the breast: Cytologic, histologic, immunohistochemical, and ultrastructural findings in two cases with differing cellularity

We present the cytologic, histologic, immunohistochemical, and ultrastructural features of two cases of myofibroblastoma with different cellularity, one paucicellular the other hypercellular. Fine-needle aspiration suggested the diagnosis in the case of the hypercellular tumor of the breast and pointed out the benign nature of the paucicellular case, arising in the breast of a young woman. Immunohistochemistry, showed smooth muscle-specific actin, vimentin, and desmin positivity consistent with myofibroblastic differentiation, in both cases. The positivity of both tumors to CD34 suggests that they may be related to the so-called solitary fibrous tumor. In addition, there was strong progesterone- and weak estrogen-receptor positivity ion the hypercellular case, a novel finding in these tumors, with possible histogenetic implications. Ultrastructural findings in the first case were consistent with the myofibroblastic origin of the tumor

Fixed subaortic stenosis revisited - Congenital abnormalities in 72 new cases and review of the literature

Seventy-two patients aged 2-65 years (mean 20.2) with fixed subaortic stenosis (FSS) are reported. All patients underwent echocardiography and angiography prior to surgical intervention, Sixty-four (89%) had discrete subaortic stenosis (DSS) and 8 (11%) tunnel type stenosis (TSS). Patients with DSS aged 2-65 years (mean 29) while patients with TSS aged 10-34 years (mean 19) and had a distinct female preponderance (7:1). Twenty-five patients (39%) with DSS had other congenital abnormalities of which aortic stenosis associated with bicuspid aortic valve was slightly more common than ventricular septal defect (7:6), Five patients with TSS had a small aortic annulus and hypoplastic aorta. Our data and those in the literature indicate that TSS although related to DSS has certain features that may set it apart as a distinct entity. In addition DSS appears to be associated with aortic stenosis and bicuspid aortic valve as frequently as with ventricular septal defect. Copyright (C) 2000 S. Karger AG, Basel