Publications by Type: Journal Article

We present an efficient numerical method to calculate shape truncation functions for Wigner-Seitz atomic polyhedra in crystalline solids. We apply our method to the case of simple cubic (SC), face centered cubic (FCC) and body centered cubic (BCC) lattices. A straightforward comparison of our results and of those obtained by other numerical techniques with the exact ones, analytically known in some simple cases, shows the efficiency and high accuracy of our method.

Ras p21 and myc p62 expression has been examined immunohistochemically in seventy specimens of bronchial carcinomas. Both ras and myc oncoproteins were found to be overexpressed at a higher frequency in non small cell carcinomas (squamous cell carcinomas and adenocarcinomas) compared to the small cell carcinoma specimens; however only myc p62 overexpression was found to be statistically significant. Also, ras p21 oncoprotein expression was frequently overexpressed in adenocarcinomas compared to squamous cell carcinomas (p < 0.05). Overexpression of c-myc p62 was found to correlate with poorly differentiated squamous cell carcinomas compared to the well and moderately differentiated tumors. The results of this study indicate that both the ras and myc oncogenes are important in the progression of bronchial carcinomas.

This study was undertaken to assess the value of intravesical interferon alfa-2b treatment in preventing the recurrences of superficial transitional cell carcinoma of the bladder. A total of 30 patients aged from 33 to 78 entered the protocol. The intravesical instillations were performed once a week for 8 weeks. A solution of 10 x 106 IU interferon alfa-2b in 30 ml of normal saline was used. Follow-up ranged from 12 to 28 months. Of the 30 patients, 19 (63.33%) were tumor free at the end of follow-up. Of the remaining 11 patients, 7 presented with recurrent superficial tumors and 4 with invasive bladder tumors. No side effects were noted.

Extensive investigations on the anatomy of the two leaf types in a seasonally dimorphic subshrub revealed interesting variations between summer and winter leaves. Summer leaves of Sarcopoterium spinosum possess a thick epidermis composed of tannin-containing cells and large amounts of mucilage secreted through the inner periclinal walls towards the mesophyll. A thick cuticle is also present on the surface of the leaf. In winter leaves the epidermal cells produce no mucilage while phenolics are accumulated in granular form only. Besides these, some other variations between summer and winter leaves are also discussed in respect of the ability of the plant to withstand the unfavourable Mediterranean conditions. © 1990 Annals of Botany Company.

The effect of pregnancy on maternal serum total cortisol (MSFT) was studied systematically in the course of 90 normal pregnancies (n = 204). Moreover, the evaluation of MSFT determinations in abnormal pregnancies, intrauterine growth retardation (IUGR) and obstetrical complications, premature rupture of the membranes (PROM), premature delivery (PD), and full term pregnancies with post maturity syndrome (PMS) were also investigated. MSFT was measured by an enzyme immunoassay. Gradual increase in MSFT was found from the 6th week of pregnancy to the 40th week of pregnancy and a sharp rise was noted during the last 2 weeks before the onset of labor (P < 0.002). In IUGR, MSFT was significantly lower (P < 0.001). In the cases of PROM and PD, MSFT was highly elevated (P < 0.0001), independently of the gestational age. In pregnancies with well documented PMS, MSFT was much lower than in normal full term pregnancies with even a downward trend in serial determinations (P < 0.0001). © 1990.

We descibe a patient with adult onset Still's disease (AOSD) who developed meningoencephalitis, sensorimotor peripheral neuropathy and uveitis during the course of disease. An abnormal cerebrospinal fluid and changes on nerve conduction studies substantiated the diagnoses of these unusual complications. The meningoencephalopathy improved before corticosteroid treatment, and the peripheral neuropathy and other features of AOSD have responded to corticosteroids. Our case illustrates the rare occurrence of both cental and peripheral neurological involvement in AOSD.

Wet precipitation-only samplers were used to collect wet deposition at two sites in the Athens basin, Greece for the period March 1986 - February 1987. Concentrations of major cations (H +, NH 4 +, Na +, K +, CA 2+) and major anions (Cl -, NO 3 - and SO 4 2-) were determined for the first time in rainwater samples in Greece. Bicarbonate concentrations were calculated. The relative importance of natural and anthropogenic sources were estimated by a chemical balance. The majority of rain collected has a neutral or alkaline character. Acidity was due to the presence of H 2SO 4 and HNO 3. The statistical analysis of the correlation between the concentration of chemical species confirm the influence of natural and anthropogenic sources. In all samples, SO 4 2- concentrations exceed NO 3 - concentrations exceed NO 3 - concentrations despite the dominance of low S oil burning in the region. The wet flux of S was calculated to be 0.34 g m -2 a -1.

High-energy neutrons produced as a consequence of proton acceleration in active galactic nuclei (AGNs) can carry a substantial fraction of the initial luminosity outside of the central source. Part of this luminosity is expected to go into VHE and UHE γ-ray emission as a result of hadronic interactions of these relativistic particles with the accreting plasma. We find that the most efficient emitters will be AGNs with luminosities ~0.01 - 0-1 of the Eddington luminosity.

Seasonal dimorphism is considered from the anatomical viewpoint. Significant differences can be observed between winter and summer leaves obtained from the same individuals. Winter leaves are thick, amphistomatic with a large number of chloroplasts in the cells of the loose mesophyll. The thinner summer leaves are hairier and hypostomatic, with compact mesophyll and cells that accumulate phenolics and crystals. CbJoroplasts are fewer in number and less developed, and at the ultrastructural level they present pronounced differences from those of the winter leaves. © 1989 Annals of Botany Company.

Maternal serum total estrogens (O(T)) human placental lactogen (HPL), pregnancy specific β1-glycoprotein (SP1) and progesterone (P) were measured by enzymeimmunoassays (EIA) in pregnancies with placental insufficiency and low birthweight infants (LBWI). It was demonstrated that these cases could be classified into three groups: Group I: The low levels of placental hormones and O(T) were significantly correlated with each other (p < 0.05 - p < 0.001), as well as with the low birthweight (p < 0.001) in pregnancies with placental insufficiency and LBWI, in which a high percentage (50%) were small for gestational age (SGA). Group II: In cases of simple placental insufficiency, the low levels of placental hormones showed a significant correlation with each other (p < 0.05) whereas only the rather normal O(T) values were correlated with the birthweight of the infant (p < 0.02). Group III: IN pregnancies with SGA, but without apparent placental insufficiency the normal concentration of placental hormones showed a high correlation with each other (p < 0.001) while only the subnormal O(T) levels were correlated significantly with the low infant birthweight (p < 0.05). SP1 values showed abnormally steep increase in cases with perinatal asphyxia.

In 23 mechanically ventilated anuric (six) or oliguric (17) patients (< 16 ml/h of urine output) with severe gas exchange abnormality, we investigated the effect of furosemide on intrapulmonary shunt (Q̇S/Q̇T). Before and after 0.5, 1, and 2 h of IV administration of 200 mg of furosemide, we assessed the intrapulmonary shunt and PaO2 while patients' hemodynamic measurements were monitored. Ventilatory parameters remained constant throughout the study. While the urine output was minimal and no alteration in hemodynamic values was found, the Q̇S/Q̇T decreased from 27.7 ± 2.3 percent (mean ± SEM) at control to 24.3 ± 2.1 percent (p < 0.01) at 0.5 h, 21.7 ± 2.1 percent (P < 0.001) at 1 h, and 18.1 ± 1.8 percent (p < 0.001) at 2 h. The PaO2 showed no significant difference at 0.5 h but rose significantly from 96 ± 14 to 105 ± 14 mm Hg (p < 0.05) and 111 ± 14 mm Hg (p < 0.01) at 1 and 2 h, respectively. Since we observed no changes in hemodynamics, we speculate a direct effect of furosemide in the pulmonary vasculature affecting the ventilation-perfusion mismatch and, therefore, the Q̇S/Q̇T and PaO2.

We present ab initio calculations for dilute Fe alloys with 3d and 4d elements. The calculations are based on local-density approximation of density-functional theory and employ the Korringa-Kohn-Rostoker Green’s-function method. Results are given for the densities of states, the local moments, and the magnetization oscillations around the impurities. A detailed comparison is made with measurements of the electronic specific heat, with neutron-scattering results for the moments of the impurity and the neighboring host atoms, and with magnetization measurements. Contrary to the case of Co and Ni alloys, the majority-spin band contributes most to the screening in the Fe alloys. This arises from the fact that the Fermi energy falls into the minimum of the minority-spin density of states. The results are in qualitative agreement with a proposed pseudogap theory and naturally explain why Fe alloys show such a complicated magnetic behavior.

A recently proposed acceleration mechanism for ultra relativistic particles in the central engines of AGN's suggests that protons are the particles which are accelerated initially, and that these subsequently inject the electrons and positrons supposed responsible for the continuum emission. This model necessarily leads to the prediction of a strong flux of neutrons (with a luminosity at least as great as that in the photon continuum) from the central engine. We investigate some of the consequences of such a model. In particular, the neutron flux will, by means of spallation reactions, produce amounts of boron in the surrounding material which it may be possible to observe in the optical spectrum. In addition, the central engine will act as a source of high energy gamma-rays. Those which can propagate to the Earth (i.e., those with energy < 10^14^ eV) may be observed directly, whereas those of higher energy will be absorbed by radio photons from either the microwave background or the AGN itself. If this occurs in a typical interstellar magnetic field, the energy of the gamma-rays will be reradiated in the form of X-rays.

A case of pure rhabdomyosarcoma of the testis is reported. The origin of these tumors is discussed and it is believed that they are teratomas with rhabdomyoblastic overgrowth of the cells. Prophylactic retroperitoneal lymph node dissection is recommended at the time of the orchiectomy, in those cases where there is no evidence of lymph node metastases.

An unusual presentation of a renal pelvis squamous cell carcinoma is reported; a loin sinus with excessive pyorrhea was the only complaint of a man with a long history of renal calculus disease.

An area of 48.5 square degrees covering the north-east and south-west outer regions of the Small Magellanic Cloud is studied with the use of the UK-Schmidt Telescope plates (taken from B_J_ and R filters). The plates were measured with the COSMOS microdensitometer and calibrated with a number of charge-coupled devices to observe sequences in the region. The resulting data set will be used for a detailed study of stellar populations and the geometry of the Small Magellanic Cloud outer regions. In this paper the production of the data set and an assessment of its accuracy are presented.

The three-dimensional (3D) distribution of the old disc and halo populations in the Small Magellanic Cloud (SMC) outlying (projected distances from the optical centre larger than 2kpc) north-eastern and south-western regions is presented. The magnitudes of the Horizontal Branch (HB)/clump stars in these regions are used as distance indicators. It is shown that in the north-eastern regions there is a significant line-of-sight depth of 17kpc on average, reaching a maximum value of 23kpc. These regions are ~10kpc deeper than the south-western regions. This result is attributed to the disruptive effect of the tidal field of the Large Magellanic Cloud (LMC) on the SMC. The possibility of the existence of two separate entities along the line-of-sight is examined.

The observed X-ray spectra reported by the GINGA and MIR-HEXE satellite experiments contain information on the metallicity of the Supernova's expanding envelope. Using a Monte Carlo code to simulate the Compton degradation of the ^56^Co -produced γ-rays, we calculate the emerging X-ray spectrum for various metallicities. The observed spectra are compatible with a low (less than solar) metal abundance, while an additional soft component, independent of the ^56^Co source is probably required in order to account for the data. The evolution of the spectral hardness is used as a sensitive indicator of the nature of the soft component, and of the possible contribution of an imbedded pulsar to the X-ray spectrum.

Συμφώνως πρὸς τὴν θεωρία τῆς ἄνισης ἀνταλλαγῆς, ἐνετοπίσθησαν ποιές ἦσαν οἱ σύμφυτες τάσεις στὶς σχέσεις παραγωγῆς, οἱ ὁποῖες ἐκυριαρχοῦσαν στὶς Μητροπόλεις καὶ οἱ ὁποῖες τὶς ὠθοῦσαν σὲ σύναψη σχέσεων μὲ τὶς περιφερειακὲς χῶρες. Βασισμένοι σὲ μεγέθη, ὅπως ἡ Ὀργανικὴ Σύνθεσις τοῦ Κεφαλαίου στὴν "Μητρόπολη" καὶ στὴν "Περιφέρεια" καὶ ὁ διεθνὴς καταμερισμὸς τῆς ἐργασίας, προσεπαθήσαμε νὰ δημιουργήσομε τὸ θεωρητικὸ σύστημα ἀναφορᾶς γιὰ τὴν μέτρηση τοῦ Γεωγραφικοῦ Χρόνου στὸ ∆ίπολο καὶ σὲ καθένα ἀπὸ τὰ σκέλη τοῦ ξεχωριστά.

We have surveyed the LMC cluster system and have identified 69 double clusters with a centre-to-centre separation of less than ~1.3 arcmin (~18 pc). We infer that a considerable fraction of these double clusters must be binaries since the calculated projection effects can account for only 31 of them. This inference is strongly supported by the fact that the ages available for some of the clusters of our sample (as determined from UBV photometry) are less than the computed times of merger or disruption of the binary cluster system. Furthermore, the space distribution of these pairs indicates that these clusters belong to a very young or young population.

We report on Monte-Carlo calculations of the emergence of X- and γ-rays from the envelope of the supernova 1987A. Assuming that there exists an X-ray emitting pulsar at the centre, we discuss the possibilities of observing its radiation and find that if the pulsar is about as luminous as the present-day Crab, it may be possible to detect the breakout at ~ 20 months. The pulsar should emerge first in the 6-16 keV band covered by GINGA. About six months later it would appear in the 20-45 keV band of MIR-HEXE. Because the optical depth of the envelope at breakout is still substantial (~4), we do not expect pulses to be detected straightaway. Our conclusions are based on a simple homogeneous model for the envelope and do not depend on whether or not ^56^Co is mixed into the outer layers. The time at which a pulsar of higher luminosity would emerge can be obtained from a simple scaling of our results.

Στο μονόπρακτο του Άρθουρ Σνίτσλερ Ο πράσινος παπαγάλος [Der grüne Kakadu] κυριαρχεί ο προβληματισμός γύρω από την ουσία της πραγματικότητας. Γάλλοι αριστοκράτες επισκέπτονται την παραμονή της Γαλλικής Επανάστασης ένα ιδιόρρυθμο θέατρο-καπηλειό του Παρισιού, όπου οι θαμώνες είναι ηθοποιοί που παριστάνουν κακοποιούς και απατεώνες. Η ευχάριστη διέγερση των νεύρων που προσφέρουν στους αριστοκράτες οι επινοημένες αφηγήσεις των ηθοποιών έρχεται σε αντίθεση με αυτό που πραγματικά συμβαίνει και που οι αριστοκράτες αποφεύγουν να συνειδητοποιήσουν: τη στιγμή που εκείνοι απολαμβάνουν την ψευδαίσθηση της απειλής και του κινδύνου, ξεσπάει έξω, στους δρόμους του Παρισιού, η Επανάσταση. Το βασικό θέμα του έργου είναι αντιπροσωπευτικό της εποχής που γράφτηκε, δηλαδή του Fin-de-siècle, της Βιεννέζικης Νεωτερικότητας αφού ο Σνίτσλερ εστιάζει στα παρακμιακά στοιχεία και στο θέμα της αποσύνθεσης της πραγματικότητας. Ακόμα και ο χαρακτηρισμός «γκροτέσκο» που χρησιμοποιεί ο συγγραφέας για το έργο δεν δικαιολογείται με αυστηρά λογοτεχνικά κριτήρια, αλλά σκοπό έχει να τονίσει την ιδιομορφία των συμβάντων στον Παπαγάλο και να σχολιάσει τη στάση του κοινού που τα υπαγορεύει και τα προκαλεί.Arthur Schnitzlers Einakter "Der grüne Kakadu" (1898), vom Autor als Groteske bezeichnet, variiert das bei Schnitzler beliebte Thema des Verhältnisses zwischen Illusion und Realität. Im historischen Kostüm gekleidet - Französiche Aristokraten geben sich am Vorabend der Revolution in einer kabarettartigen Spelunke dem Spiel mit der Illusion hin, ohne die nahende Katastrophe wahrzunehmen - lassen sich die Figuren des Stücks nach dem Grad ihres Wirklichkeitsverhältnisses charakterisieren. Schon die Wahl des historischen Moments impliziert eine kritische Haltung gegenüber einer realitätsabblendenden Attitüde, die letztendlich auf Schitzlers Zeit und Gesellschaft hinweist.

Self-consistent, first-principles calculations are presented for the electronic structure of some point defects in the binary alloys CoAl and CoGa. All possible structural defects-i.e., antistructure atoms and vacancies-as well as 3d transition-metal impurities on both sublattices are considered. The calculations are based on the Korringa-Kohn-Rostoker Green's-function method and on density-functional theory in the local-spin-density approximation. The calculated densities of states, charge transfers, and magnetic moments are discussed and compared with the results of other theoretical calculations and the available experimental data.

We report about self-consistent calculations for dilute Ni alloys, which are based on density-functional theory and the Korringa-Kohn-Rostoker Green's-function method. In particular, we calculate the charge and magnetization perturbations for four shells of atoms around the impurity. Impurities of the 3d, 4d, and 4sp series are considered. Of central interest is the transition from strong to weak ferromagnetism and the different screening mechanism in these alloys. We compare our results for the perturbations of the local moments as well as the change of the total moment with magnetization and neutron scattering data.

A detailed model for positron production by a young pulsar is presented. It is shown that electromagnetic cascades can develop in a young pulsar's magnetosphere, and the model results are applied to the pulsar which is hypothesized to lie near the Galactic center. It is found that such a pulsar would be expected to produce relatively low energy electron-positron pairs with an efficiency rating high enough to explain the observed luminosity of the Galactic center annihilation line. Virtually all of the gamma ray continuum radiation produced in the cascades would be beamed along the magnetic poles of the neutron star, and therefore probably would not be observed from earth. Some observational predictions generated by the proposed model for the Galactic center positron source are given.

We consider the electronic structure of dilute Pd and discuss reasons for the disagreement between experiment and theory, especially concerning the Pd density of states. The intensity of the low energy Pd peak, obtained in previous calculations, is very sensitive to charge transfer, lattice relaxation and relativistic effects. Realistic ab-initio calculations, which take these effects properly into account, practically remove the intensity of the low energy Pd peak and are in much better agreement with experiments than previous single site and KKR-CPA results.

High-energy (70 MeV < E < 5 GeV) gamma-ray observations of Cyg X-3 by the ESA satellite COS-B and hard X-ray (14 keV < E < 140 keV) observations by the Leiden-MIT balloon experiment, Leimit, are presented. A comparison with, and a study of earlier results over the 14 decades in energy from 1 keV up to ≡1017eV indicates that the strong variability of Cyg X-3 over more than one order of magnitude at energies below 20 keV does not exhibit itself in the data collected at hard X-ray energies, and the power emitted per decade of energy reaches a minimum in the MeV-GeV region. If the primary gamma-rays up to 1015eV originate close to the central source, absorption by the keV X-rays in the Cyg X-3 binary system could explain the latter phenomenon.

An investigation of the star clusters in the outermost areas of the LMC has started in order to examine the observed dynamical properties of the halo globular clusters in this galaxy. A first sample of 38 clusters have been measured by means of star counts on plates taken with the 1.2 m U.K. Schmidt telescope. The derived tidal radii and masses are comparable to those found for the disk young clusters of the LMC and those of the galactic globulars.

Anomocytic stomatal complexes observed with light and scanning electron microscopes on the primary roots of Ceratonia siliqua (carob tree) are described. Stomata are randomly distributed throughout the surface of the root zones which possess mature vascular tissues, i.e. from the zone of root hairs to the transition zone. Stomatal orientation does not follow that of the root epidermal cells whilst their distribution does not seem to form a regular pattern. © 1987 Annals of Botany Company.

We develop a formalism to take into account the lattice relaxation around an impurity within the Korringa-Kohn-Rostoker Green's-function method. Using this formalism and the density-functional theory in the local spin-density approximation we perform first-principles, self-consistent calculations for the electronic structure of some dilute metallic alloys. In particular, we investigate the influence of lattice relaxations on the local magnetic moments in CuMn, CuFe, CuCo, and NiMn.

Ὁ Alain Lipietz, στὸ βιβλίο του Le capital et son espace, καὶ συγκεκριμένως στὴν 10ην σελίδα τῶν Avertissent του, θέτει τὸ ἐρώτημα: «Πότε λοιπὸν οἱ Μαρξιστὲς προβληματίσθησαν μὲ τὸν χῶρο;». Εἶναι ἕνα ἐρώτημα σοβαρὸ ποὺ δέχεται μιὰν ἁπλῆ ἀπάντηση· ὁ Lipietz τὴν δίδει: «Ὅταν οἱ σχέσεις ἀνάμεσα σ’ ἐκμεταλλευτὲς κ’ ἐκμεταλλευομένους ἐπῆραν τὴν χωρική τους διάσταση —ὅταν— ἡ ἀντίστασις τῶν ἐκμεταλλευομένων ποὺ ἠρνοῦντο νὰ τοὺς μεταχειρίζονται σὰν πιόνια ποὺ τὰ μετακινοῦν, σὰν εὐκολομεταχείριστο ἐργατικὸ δυναμικό, σὰν μεταβλητὸ καὶ... κινητὸ κεφάλαιο, ἐδημιούργησε νέα πεδία πάλης καὶ τοὺς ἀναλόγους θεωρητικοὺς προβληματισμούς». Μέσα στὴν προσπάθεια τῶν Γεωγράφων νὰ δώσουν ἀπαντήσεις στὸν ἀντίστοιχο θεωρητικὸ προβληματισμὸ καὶ ἰδιαιτέρως στὴν δημιουργία μιᾶς μεθοδολογίας ἀναλύσεως τοῦ Οἰκονομικοῦ Χώρου, ἐντάσσεται καὶ ἡ ἀναδομὴ στὸ μαρξιστικὸ ἔργο καὶ συγκεκριμένως στὴν Γερμανικὴ Ἰδεολογία (1846). Ἡ προσπάθεια ποὺ ἔγινε, στόχο ἔχει ν’ ἀποτελέσει τὴν ἀπαρχὴ μιᾶς ὡλοκληρωμένης μελέτης ἐπάνω στὸ Κεφάλαιο (1861-1875), τὶς θεωρίες γιὰ τὴν Ὑπεραξία καὶ τὴν Γερμανικὴ Ἰδεολογία σὲ συνάρτηση μὲ τὸ μέγεθος τοῦ Οἰκονομικοῦ Χώρου. Τὸ ζητούμενο σ’ αὐτὴν τὴν περίπτωση εἶναι νὰ ἀποδειχθεῖ ὅτι ἡ μαρξιστικὴ σκέψις ὡριοθέτησε τὸν Οἰκονομικὸ Χῶρο ποιοτικῶς καὶ ποσοτικῶς, ἔδωσε τὰ δομικά του χαρακτηριστικά, ἐνετόπισε τὴν θέση του στὴν Ἱστορία καὶ τὸν ρόλο του στὴν δημιουργία της. Ὑποστηρίζομε λοιπὸν ὅτι ὁ Οἰκονομικὸς Χῶρος στὸν Μὰρξ εἶναι συντελεστὴς καθοριστικὸς «παραγωγῆς» τῆς Ἱστορίας. Ἄρα ἔχει ἱστορικὴ διάσταση καὶ ὡς ἐκ τούτου «παράγει» χρόνο. Τὸν χρόνο αὐτὸν τὸν ὠνομάσαμε Γεωγραφικὸ Χρόνο καὶ τὸν θεωροῦμε ὡς ἕνα ἀπὸ τὰ βασικὰ χαρακτηριστικὰ τοῦ Οἰκονομικοῦ Χώρου. Ἡ ἐξέτασις ποὺ γίνεται εἰς αὐτὴν τὴν δημοσίευση εἶναι διττή. Ὁ Οἰκονομικὸς Χῶρος καὶ ὁ Γεωγραφικὸς Χρόνος ἐξετάζονται παραλλήλως γιὰ νὰ κατορθώσομε νὰ δείξομε τὴν σχέση ποὺ τοὺς συνδέει καὶ τὴν ἀμφίδρομο διάδραση ποὺ λειτουργεῖ ἀνάμεσά τους μὲ ἀποτέλεσμα τὴν συνεχῆ ἐξέλιξη καὶ τῶν δύο ὀντοτήτων μέσα στὸ σῶμα τῆς ἱστορίας. Ἡ τοποθέτησις τοῦ Οἰκονομικοῦ Χώρου ἐντοπίζεται στὴν μαρξιστικὴ σκέψη στὸ ἐπίπεδο τῆς «ὑποδομῆς» καὶ στὴν ἀνάλυση ποὺ θὰ ἀκολουθήσει θὰ εἶναι διαρ κῶς ἐμφανὴς ἡ προσπάθεια τοῦ ξεκαθαρίσματος τοῦ ρόλου τοῦ Οἰκονομικοῦ Χώρου στὸ δίπολο «βάσεως-ἐποικοδομήματος» ἢ ἀλλοιῶς «ὑποδομῆς καὶ ὑπερδομῆς». Κάθε συνιστῶσα ἢ δύναμις ποὺ παρεμβαίνει στὴν δημιουργία Οἰκονομικοῦ Χώρου ἐντοπίζεται κ’ ἐξετάζεται στὴν σχέση της μὲ τὴν παραγωγὴ τοῦ Γεωγραφικοῦ Χρόνου ἢ στὸν πιθανὸ ἐπηρεασμό της ἀπὸ αὐτόν. Ἀκόμη προσπάθεια γίνεται νὰ ἐρευνηθοῦν οἱ σχέσεις τοῦ Γεωγραφικοῦ Χρόνου μὲ τὸν Ἱστορικὸ Χρόνο καὶ ἡ λειτουργία τους μέσα στὸ δίπολο βάσεως-ἐποικοδομήματος.

We report on self-consistent ab-initio calculations for the electronic structure of intrinsic defects in CoAl, i.e. antistructure (AS) Co atoms and vacancies on the Co sublattice. The calculations are based on the Korringa-Kohn-Rostoker (KKR) Green's function method and employ the local spin density approximation of the density functional theory. The results for the densities of states, the charge transfers and the local moments are discussed and compared with the available experimental data.

The electronic structure of a simple model for (La, Ce, Th, U)Be13 compounds is determined self-consistently within the density functional theory. The rare earth or actinide atom is considered as a spherically symmetric impurity embedded in a jellium. The width and position of f-localised states result naturally from the scattering of conduction electrons by the impurity potential. The results of the author's calculation for electronic specific heat, position and width of f-resonant states are compared with available theoretical results and experimental data.

The fully differential cross section for photon-electron pair production is integrated numerically over phase space. Results are obtained for the astrophysically interesting case in which the interaction between an ultrarelativistic electron and a soft photon results in electron-positron pair production. The positron spectrum is a function of the energies of both the photon and the electron, as well as the angle of interaction. It is found that the energy at which the positron distribution peaks is inversely proportional to the photon energy and independent of the electron energy. The positron spectrum is integrated once more over initial electron energies for a power-law energy distribution of primary electrons. The same procedure is repeated for the recoil particle; it is shown that the peak of the recoil energy distribution depends linearly on the energy of the primary electron. Finally, semianalytical expressions are obtained for the energy losses of the primary electrons.

A mechanism for producing the high energy γ-ray spectrum of X-ray binaries exhibiting ultra-high-energy activity is proposed. γ-rays can result from decay of π0 produced in collisions of energetic protons with the keV ambient photons. Consequently, the X-ray photons modify the produced primary spectrum by selectively absorbing the lower energy part of it. As a result of this differential absorption these systems should exhibit a power law spectrum of index 1.5 - 2.0. Moreover, these systems should have a high electron-positron pair number density that will lead to 511 keV annihilation line emission.

The general formalism describing the electronic structure of dilute impurities in ordered compounds within the linear-muffin-tin-orbital approximation is presented. It is derived by considering the proper limit in the Green-function theory within the multiple-scattering formalism. The method thus obtained retains the advantages of the Green-function method for ab initio self-consistent calculations, but with reduced numerical efforts. We discuss in great detail several important aspects of its practical application towards point defects in cubic ordered metallic compounds; the part played by Friedel's screening rule, the calculation of the charge perturbations induced in the host, and the use of the complex-plane integration method are especially stressed.

Ab initio self-consistent electronic-structure calculations of vacancies in ordered stoichiometric FeAl within the linear-muffin-tin-orbital atomic-sphere-approximation method are presented. The potential and local densities of states on the defect and the charge perturbations on its neighboring sites in the matrix are calculated and discussed in relation with numerous experimental results concerning the effect of small departures from stoichiometry for this ordered compound.

A case of a patient presenting with the symptoms of lifelong xerostomia is discussed. Clinical investigation demonstrated aplasia of all the major salivary glands, lacrimal gland hypoplasia and enamel hypoplasia. The management and aetiology of the case is discussed.

Στα πλαίσια του αφιερώματος του λογοτεχνικού περιοδικού «Διαβάζω» στον Γιόχαν Βόλφγκαγκ φον Γκαίτε γίνεται με το άρθρο αυτό αναφορά στη σχέση του Γκαίτε με την αρχαία ελληνική λογοτεχνία και σύγκριση της «Ιφιγένειας εν Ταύροις» του Γκαίτε με το έργο του Ευριπίδη.  Παρουσιάζεται η εξιδανικευμένη άποψη  του κλασικισμού για την ελληνική αρχαιότητα και σχολιάζεται η αναθεώρηση της άποψης αυτής στον ύστερο κλασικισμό.

The polymorphism of the third component of the human complement (C3) was investigated in a sample of 1,055 unrelated healthy individuals from nine different areas of Greece. The estimated gene frequencies were: C3S = 0.786 and C3F = 0.211. Three individuals were found to have rare variant C3 types. The allele frequencies resemble those reported for other Caucasian populations. © 1985 S. Karger AG, Basel.

Ab initio self-consistent calculations are presented of the electronic structure of sp and 3d impurities in simple and ferromagnetic alloys. The calculations have been performed according to the LMTO-ASA method, fully taking into account the band structure of the host.The density functional theory has been used in the local spin-density approximation; the impurity potential is assumed to be of the muffin-tin form and lattice relaxation effects are neglected. Friedel's sum rule is always satisfied during the calculation. Charge and spin-density perturbation induced in the matrix are computed up to the fourth-nearest neighbour shell.The present theoretical results obtained for local moment, hyperfine field on the impurity, change in the saturation magnetization and magnetic perturbation effects induced by the impurity on the neighbouring atoms are in good agreement with the available experimental data.

Τὸ πρόβλημα ποὺ καλούμεθα νὰ ἐξετάσομε, συνίσταται στὴν προσπάθεια δημιουργίας μιᾶς μεθοδολογίας γεωγραφικῆς ἀναλύσεως, ποὺ στόχο της ἔχει τὴν ποιοτικὴ καὶ ποσοτικὴ παρουσίαση καὶ ἀξιολόγηση τῆς ἀναπτυξιακῆς σημασίας τῶν ρευμάτων μεταφορῶν ἐμπορευμάτων στὸν χῶρο. Ἐπίσης τίθεται τὸ πρόβλημα ἀνεπαρκείας πληροφορίας (ποιοτικῆς καὶ ποσοτικῆς) γιὰ τὸν προσδιορισμὸ τῶν ρευμάτων μεταφορῶν καὶ προτείνονται μέτρα καὶ μέθοδοι γιὰ τὴν ἀντιμετώπισή του. Ἡ ἐργασία ἐξετάζει ἀκόμη τὸ πρόβλημα τῆς ρευστότητος στὸν προσδιορισμὸ τῶν γεωγραφικῶν ὁρίων τῶν περιοχῶν, λειτουργιῶν ποὺ προκύπτουν ἀπὸ τὴν περιφερειακὴ ὀργάνωση τοῦ χώρου κάτω ἀπὸ τὴν μεταμαρξιανὴ ὀπτικὴ γωνία τῆς σύγχρονης Γεωγραφίας.

The distribution of phenotypes and gene frequencies of the third component of complement (C3), group-specific component (Gc), haptoglobin (Hp) and transferrin (Tf) were studied in 115 patients with carcinoma of the prostate. The statistical analysis of our findings in comparison to the frequency of these genes in a control group of 155 patients with benign prostatic hyperplasia does not reveal any correlation between the distribution of the Hp and Tf phenotypes and the disease. On the contrary, a statistically significant association was found between carcinoma of prostate and C3(F) and Gc2 genes. The relative risk incidence of this malignancy is 1.56 and 1.81, respectively, for the carriers of these genes suffering from benign prostate hyperplasia.

The distribution of phenotypes and gene frequencies of the 3rd component of complement (C3), group-specific component (G(c)), haptoglobin (Hp) and transferrin (T(f)) were studied in 50 patients with renal adenocarcinoma. The statistical analysis of our findings in comparison to the frequency of these genes in the general population does not reveal any correlation between the distribution of the Hp and Tf phenotypes and the disease. On the contrary, a statistically significant association was found between renal adenocarcinoma and C3(F) and Gc 2 genes. The relative risk incidence of this malignancy is 2.07 and 1.94 respectively for the carriers of these genes. These data indicate that genetic factors, possibly related to the immune mechanisms and calcium metabolism, play a role in the pathogenesis of renal adenocarcinoma.

Cambial activity of post fire resprouted stems of Quercus coccifera and Olea europaea ssp. oleaster is demonstrated.-from Authors

Cambial activity of post fire resprouted stems of Quercus coccifera and Olea europaea ssp. oleaster is demonstrated.-from Authors

La région thessalienne, dans cette étude, devient la matière première d’une expérience: celle de la création d’une méthodologie en ce qui concerne l’analyse géographique de réseaux de transports (terrestres et maritimes) des marchandises sous un angle qualitatif et quantitatif. La superficie de la région occupée le 1/10e de la superficie totale de la Grèce, dont le secteur primaire occupe 40% de son activité économique; ceci nous fait comprendre l’importance de la participation de la région thessalienne à la formation du P.N.B. du pays. Il faut bien souligner aussi que le caractère géomorphologique et climatique de cette région crée une différenciation économique très frappante entre la partie occidentale et la partie orientale de la région. La partie orientale, une plaine vaste et fertile, se trouve au milieu de la Grèce, site privilégie qui doit ses avantages à l’existence de l’axe principal routier et ferroviaire de la Grèce, qui relie Athènes à Salonique. La partie occidentale se caractérise au point de vue géomorphologique par les grands massifs montagneux qui sont essentiellement les causes de son sous-développement économique (avec toutes les conséquences socioculturelles qui l’accompagnent). Cette partie est éloignée des grands axes routiers et des accès maritimes (portuaires), fait qui intensifie l’attardement économique. La plupart des sous-régions administratives (éparchies) de cette partie, sont caractérisées dans cette étude ‘en difficulté’ et d’un caractère en majorité agricole (élevage, bois) sous-développée. Le manque d’infrastructure en matière de transports, et la mise en valeur de certaines liaisons routières et maritimes avec l’Europe du nord, dont la possibilité de création se présente dans cette étude, accompagne d’une incapacité au point de vue aménagement du territoire dont fait preuve le Ministère de la Coordination, nous ont poussé à l’effort de la création d’une méthodologie d’analyse qui sera capable de mettre en relief de façon qualitative et quantitative les caractéristiques et les paramètres des flux des transports de marchandises, flux qui se créent d’après les fonctions économico-sociales de l’espace géographique donne.

The distribution of phenotypes and gene frequencies of the C3 component of complement, group-specific component, transferrin and haptoglobin were studied in 155 patients with benign prostatic hyperplasia. A statistical analysis of the findings in comparison with the frequency of these genes in the general population failed to demonstrate any correlation between phenotype distribution and benign prostatic hyperplasia.

The distribution of the phenotypes and the gene frequency of the 3rd fraction of complement (C3), the specific group (Gc), haptoglobin (Hp) and transferrin were studied in 133 patients with transitional cell cancer of the bladder (papillary cancer). Statistical analysis of these results, in comparison with the frequency of these genes in the general population, was unable to demonstrate a correlation between the distribution of these phenotypes and papillary cancer.

We present the results of the calculation of the electronic structure of impurities (Ti, V, Cr, Mn, Co, Ni, Cu) diluted in ferromagnetic iron obtained by the method of linear combination of «muffin-tin» orbitals in the atomic sphere approximation (LMTO-ASA). The local moments and the hyperfine fields on the impurity and the electronic specific heat coefficient charges are compared with the experimental data.