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Search Results: 1 - 10 of 462055 matches for " Antonios A. Pitsis "
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Beta-adrenergic receptor polymorphisms: A basis for pharmacogenetics  [PDF]
Efstratios K. Theofilogiannakos, Konstantinos Dean Boudoulas, Brian E. Gawronski, Taimour Y. Langaee, Timotheos G. Kelpis, Antonios A. Pitsis, Julie A. Johnson, Harisios Boudoulas
World Journal of Cardiovascular Diseases (WJCD) , 2013, DOI: 10.4236/wjcd.2013.36063
Abstract: Aims: Polymorphisms of the β-adrenergic receptor, the frequency of which may differ in ethnic groups, alters β-receptor function. The aim of this study was to elucidate the frequency of β1 and β2-adrenergic receptor polymorphisms in healthy Greeks and to compare with those of Caucasian European (Euro) and African American (AA) origin. Methods: Ninety-nine individuals with a median age of 63 without clinical evidence of any disease were studied. Blood samples were obtained and common β1 and β2-adrenergic receptor polymorphisms that change the en-coded amino acid were determined by pyrosequencing. Results: The most common β1-adrenergic receptor polymorphism in Greeks is nucleotide substitution cytosine for guanine at position 1165 (1165 C/G) resulting in amino acid substitution arginine for glycine at position 389 (389 Arg/Gly) with a minor allele frequency of 28% (Euro 27%, AA 42%); this polymorphism increases the sensitivity of the β1-receptor. The most common
The Potential Predictive Value of Preoperative Brain Natriuretic Peptide Levels in Coronary Artery Bypass Grafting Surgery
Konstantinos Tziomalos, Julia Sevastidou, Antonios A. Pitsis, Asterios Karagiannis, Georgios Kyriazis, Margarita Kataropoulou, Aikaterini Mpalaska, Vasilios G. AthyrosElias BasayannisAims:Methods and Results:Conclusion:
The Open Cardiovascular and Thoracic Surgery Journal , 2008, DOI: 10.2174/1876533500801010027]
Abstract: Aims: The aim of this study was to assess whether preoperative and postoperative brain natriuretic peptide (BNP) levels could be used as predictors of postoperative complications and outcome in patients with coronary artery disease and ischemic heart failure undergoing on-pump or off-pump coronary artery bypass grafting surgery (CABG). Methods and Results: Fifty-eight patients (56 males and two females) with a median age of 65.3±9.9 years were included in the study. Thirty-eight patients (65.5%) underwent on-pump CABG, and 20 patients (34.5%) underwent off-pump CABG. BNP levels were determined within 24 hours before CABG and serially at 6 hours, 24 hours, 3, 7 and 30 days after CABG. Creatine phosphokinase myocardial band (CK-MB) levels were measured 1, 3, and 7 days after CABG. BNP and CK-MB levels did not differ significantly between the two groups at any time point. Preoperative BNP levels independently predicted the occurrence of cardiogenic shock and more importantly, short-term mortality. Neither preoperative left ventricular ejection fraction nor postoperative BNP or CK-MB levels at any time point showed any significant independent prognostic value for any postoperative complication. Conclusion: Our results suggest that it may be prudent to more closely monitor patients with higher preoperative BNP levels for possible postoperative complications.
Numerical method for binary black hole/neutron star initial data: Code test
Antonios A. Tsokaros,Koji Uryu
Physics , 2007, DOI: 10.1103/PhysRevD.75.044026
Abstract: A new numerical method to construct binary black hole/neutron star initial data is presented. The method uses three spherical coordinate patches; Two of these are centered at the binary compact objects and cover a neighborhood of each object; the third patch extends to the asymptotic region. As in the Komatsu-Eriguchi-Hachisu method, nonlinear elliptic field equations are decomposed into a flat space Laplacian and a remaining nonlinear expression that serves in each iteration as an effective source. The equations are solved iteratively, integrating a Green's function against the effective source at each iteration. Detailed convergence tests for the essential part of the code are performed for a few types of selected Green's functions to treat different boundary conditions. Numerical computation of the gravitational potential of a fluid source, and a toy model for a binary black hole field are carefully calibrated with the analytic solutions to examine accuracy and convergence of the new code. As an example of the application of the code, an initial data set for binary black holes in the Isenberg-Wilson-Mathews formulation is presented, in which the apparent horizons are located using a method described in Appendix A.
On the Validity of Janak’s Theorem and Ground State Energies of Ensembles of Interacting Quantum N-Particle Systems  [PDF]
Antonios Gonis
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.42012
Abstract:

It is established that for finite number of electrons, N < , and in the limit T = 0, the line of reasoning leading to the proof of Janak’s theorem is flawed, based on the incorrect treatment of a mixed state as a pure state. The derivative discontinuity at integral values of N of the total ground state energy, Ev[N], of an interacting N-particle system under an external single-particle potential, v(r), is shown to follow from general quantum principles governing the behavior of ensembles of systems with varying particle number, and its presence is shown to be independent of the particular approximation used in determining the total ground-state energy of an ensemble.

Foliar Applications with Plant-Derived Extracts Control Pistachio Psyllid, Agonoscena pistaciae  [PDF]
Antonios E. Tsagkarakis, Antonios D. Margiotoudis
Advances in Entomology (AE) , 2017, DOI: 10.4236/ae.2017.53008
Abstract: Citrus and palm trees’ extracts, commercially formulated as ProAlexin PNSTM and AgrisprayTM, were studied against the pistachio psyllid, Agonoscena pistaciae, in field conditions. Generally, foliage spraying application against the pistachio psyllid may cause severe reduction on the honeybee forager population, which visits infested trees to collect honeydew. ProAlexinTM products have the same formulation with Provigoro 14 WA Bee Care, a natural water acidifier, which not only has negative action on the honeybees, but also shows disinfectant action against Nosema spp. The scope of the present study was to determine any effect of ProAlexin products on the reduction of the population of the pistachio psyllid, Agonoscena pistaciae. Experiments were performed at the orchard of the A.U.A., with two mixtures sprayed on psyllid infested pistachio trees, the first with ProAlexin PNSTM and AgrisprayTM and the second only with AgrisprayTM. They were both applied with the addition of APG25TM non-ionic surfactant. Results showed that mortality on the trees treated with ProAlexin PNSTM + AgrisprayTM mixture and AgrisprayTM was significantly higher compared with the control. This could be explained due to the phytoalexins that these products elicit, which are part of the plant mechanism against insect herbivores. These products are potentially promising methods to be used in sustainable agriculture approaches against the pistachio psyllid and they should be tested for their effects on the biological control agents of this pest. Beyond this, the results of this study encourage to test their effects on other pests of pistachio and other tree species.
Essential Oils of Satureja Species: Insecticidal Effect on Culex pipiens Larvae (Diptera: Culicidae)
Antonios Michaelakis,Spiridon A. Theotokatos,Georgios Koliopoulos,Nikos G. Chorianopoulos
Molecules , 2007, DOI: 10.3390/12122567
Abstract: The chemical composition of the essential oils of the wild growing plants of Greek S. spinosa L., S. parnassica subsp. parnassica Heldr.& Sart ex Boiss., S. thymbra and S. montana were determined by GC and GC/MS analysis. The larvicidal activities of the essential oils were assayed against Culex pipiens biotype molestus. The analytical data indicated that various monoterpene hydrocarbons and phenolic monoterpenes constitute the major constituents of the oils, but their concentration varied greatly among the oils examined. The bioassay results indicated that the oils possess significant larvicidal activities and represent an inexpensive source of natural substances mixture that exhibit potentials for use to control the mosquito larvae.
Modelling and Verification of Multiple UAV Mission Using SMV
Gopinadh Sirigineedi,Antonios Tsourdos,Rafa? ?bikowski,Brian A. White
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.20.3
Abstract: Model checking has been used to verify the correctness of digital circuits, security protocols, communication protocols, as they can be modelled by means of finite state transition model. However, modelling the behaviour of hybrid systems like UAVs in a Kripke model is challenging. This work is aimed at capturing the behaviour of an UAV performing cooperative search mission into a Kripke model, so as to verify it against the temporal properties expressed in Computational Tree Logic (CTL). SMV model checker is used for the purpose of model checking.
Geometric Simultaneous RAC Drawings of Graphs
Evmorfia N. Argyriou,Michael A. Bekos,Michael Kaufmann,Antonios Symvonis
Computer Science , 2011,
Abstract: In this paper, we introduce and study "geometric simultaneous RAC drawing problems", i.e., a combination of problems on geometric RAC drawings and geometric simultaneous graph drawings. To the best of our knowledge, this is the first time where such a combination is attempted.
The Straight-Line RAC Drawing Problem is NP-Hard
Evmorfia N. Argyriou,Michael A. Bekos,Antonios Symvonis
Computer Science , 2010, DOI: 10.1007/978-3-642-18381-2_6
Abstract: Recent cognitive experiments have shown that the negative impact of an edge crossing on the human understanding of a graph drawing, tends to be eliminated in the case where the crossing angles are greater than 70 degrees. This motivated the study of RAC drawings, in which every pair of crossing edges intersects at right angle. In this work, we demonstrate a class of graphs with unique RAC combinatorial embedding and we employ members of this class in order to show that it is NP-hard to decide whether a graph admits a straight-line RAC drawing.
Maximizing the Total Resolution of Graphs
Evmorfia N. Argyriou,Michael A. Bekos,Antonios Symvonis
Computer Science , 2010,
Abstract: A major factor affecting the readability of a graph drawing is its resolution. In the graph drawing literature, the resolution of a drawing is either measured based on the angles formed by consecutive edges incident to a common node (angular resolution) or by the angles formed at edge crossings (crossing resolution). In this paper, we evaluate both by introducing the notion of "total resolution", that is, the minimum of the angular and crossing resolution. To the best of our knowledge, this is the first time where the problem of maximizing the total resolution of a drawing is studied. The main contribution of the paper consists of drawings of asymptotically optimal total resolution for complete graphs (circular drawings) and for complete bipartite graphs (2-layered drawings). In addition, we present and experimentally evaluate a force-directed based algorithm that constructs drawings of large total resolution.
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