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Search Results: 1 - 10 of 671 matches for " Athanasios Ververidis "
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Unusual Intramuscular Lipoma of Deltoid Muscle
Stylianos Kapetanakis , Jiannis Papathanasiou , Antonios Dermon , Alexandra Dimitrakopoulou , Athanasios Ververidis , Pelagia Chloropoulou , Konstantinos Kazakos
Folia Medica , 2010, DOI: 10.2478/v10153-010-0050-x
Abstract: Lipomas are common soft tissue tumors usually located under the skin. Nevertheless, intramuscular lipomas of deltoid muscle are unusual tumors. We present a case of 74 years old woman with an intramuscular like clepsydra lipoma of deltoid muscle. The lesion was a palpable soft mass at the lateral side of the humerus. The patient had no previous history of trauma. The main symptom was pain only in abduction and extension. Imaging, pathological findings and surgical excision are discussed.
Primary laparoscopic button gastrostomy in infants and children
M. Ververidis, T. Tsang
Annals of Gastroenterology , 2007,
Abstract: SUMMARY Aim: Laparoscopic gastrostomy in children has recently become an established minimally invasive alternative to endoscopic insertion. The authors describe a method of primary laparoscopic button gastrostomy, in order to emphasize certain technical modifications that make it safer, simpler and more effective than previously reported techniques. Materials and methods: The medical records of 17 children who underwent primary laparoscopic button gastrostomy are reviewed. The Seldinger technique was used for the button insertion and the stomach was fixed to the epigastrium with two U-sutures. The modifications of our technique as compared to others are: 1) the tract is minimally dilated to permit a snug fit of the button, 2) a size 12 Fr button is used in all cases and 3) a Tuohy needle stabilizes the device to negotiate the tight gastric tract. Results: The mean age at operation was 25 months (range 3 months to 13 years). The main indication for gastrostomy was inability to swallow secondary to neurological impairment (82%). Four patients had concommitant laparoscopic antireflux procedure. The mean hospital stay for gastrostomy alone was three days. The mean follow-up was six months. There was no perioperative mortality or major life-threatening complications associated with the gastrostomy. No complication was serious enough to require removal of the button or hospitalization. There were no leaks. The nutritional status improved remarkably in the majority of patients. Conclusions: A primary button gastrostomy can be performed safely under laparoscopic guidance via a single umbilical port with minimal morbidity. The use of a Tuohy needle for the stabilization of the button facilitates the introduction of even the smallest size of gastrostomy device. Key words: Gastrostomy, Button, Laparoscopy, Children
Producing a Double Dividend for the EU-27 and USA with the Macro-Economic E4M-GAIA Model: Meeting G8 80% Emissions Reduction Target Leads to Economic Growth  [PDF]
Athanasios Dagoumas
Low Carbon Economy (LCE) , 2013, DOI: 10.4236/lce.2013.42006
Abstract:

The international negotiations concerning climate change, taken place during the UNFCCC conference in Durban at the end of year 2011, have failed to establish a new global agreement to reduce global emissions. Therefore, the G8 commitments on 80% reduction by 2050 seems to be the most realistic climate change mitigation framework for the time being, enhanced by the political will of the EU and USA administrations. For the needs of this paper, the G8 80% target is further extended to cover the whole EU-27 region, where the reduction commitments of the EU-27 member states are allocated based on the relevant allocation weights considered for the Kyoto Protocol obligations. This paper examines the implementation of the EU-27 and USA 80% emissions reduction target using a macro-economic hybrid model E4M-GAIA of the global economy, standing for Energy-Economy-Environment-Engineering Model of the Earth. The E4M-GAIA model, which adopts similar theoretical background with the “New Economics” school depicted mainly in the well-established Cambridge University’ E3 models, is used to implement this target and to compare it with a reference scenario, where no reduction target is pursued. Both scenarios consider that impact of the financial crisis, with updated information to the end of 2010. This paper aims to provide evidence that the proper direction of a portfolio of policies including: regulation, behavioral shift, revenue recycling, energy investments, energy and carbon pricing, can lead to double dividend, namely meeting a deep reduction target and providing gains for the economy.

A Representation of the Maximal Set in Choice Problems Where Information Is Incomplete  [PDF]
Andrikopoulos Athanasios
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.811167
Abstract: Banerjee and Pattanaik [1] proved that the maximal set generated by a quasi-ordering is equal to the union of the sets of best elements of its ordering extensions. Suzumura and Xu [2] extended Banerjee and Pattanaik’s result by relaxing the axiom of transitivity to the axiom that Suzumura calls consistency. Arló Costa in [3] pointed out that in general, an optimizing model cannot require the transitivity of the binary relation used in an optimizing model. In this paper, by using two important ideas of John Duggan [4], I extend the above mentioned results to arbitrary binary relations whose extensions are complete and not necessarily transitive.
Time Series Forecasting of Hourly PM10 Using Localized Linear Models  [PDF]
Athanasios Sfetsos, Diamando Vlachogiannis
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.34042
Abstract: The present paper discusses the application of localized linear models for the prediction of hourly PM10 concentration values. The advantages of the proposed approach lies in the clustering of the data based on a common property and the utilization of the target variable during this process, which enables the development of more coherent models. Two alternative localized linear modelling approaches are developed and compared against benchmark models, one in which data are clustered based on their spatial proximity on the embedding space and one novel approach in which grouped data are described by the same linear model. Since the target variable is unknown during the prediction stage, a complimentary pattern recognition approach is developed to account for this lack of information. The application of the developed approach on several PM10 data sets from the Greater Athens Area, Helsinki and London monitoring networks returned a significant reduction of the prediction error under all examined metrics against conventional forecasting schemes such as the linear regression and the neural networks.
Evaluation of the Reliability Performance of Failure Criteria for Composite Structures  [PDF]
Athanasios J. Kolios, Stefano Proia
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.23019
Abstract: Evolution of materials, following the design requirements of special structures, has shifted interest towards development of composite members able to meet strength requirements “tailored” to specific applications. These members can provide appropriate, more cost effective structures, however absence of generic design guidelines raise constraints towards derivation of optimized structures. Reliability-based assessment can overcome this limitation by ensuring that acceptable levels of target reliability are achieved throughout their service life. This paper presents a methodology for reliability assessment of composite members based on appropriate limit state functions derived according to fundamental failure criteria, Tsai-Hill and Tsai-Wu, applicable to composite materials. The methodology that is proposed employs a Stochastic Response Surface Method (SRSM) which combines in discrete steps FEA modelling, numerical simulations and analytical probabilistic assessment techniques, allowing use of commercial and custom developed specialized numerical tools. Application of the proposed methodology on a complex composite structural geometry will illustrate its efficiency and evaluate the reliability performance of the limit states derived and examined.
Allelic Frequency in Human SNPs Predicts the Rate of Non-Synonymous Nucleotide Substitutions between Human and Chimpanzee Genes  [PDF]
Hippokratis Kiaris, Athanasios G. Papavassiliou
Advances in Anthropology (AA) , 2014, DOI: 10.4236/aa.2014.41007
Abstract:

The combination of comparative genomics and population genetics may provide important clues regarding human evolution. We have hypothesized that the divergence between various human and chimpanzee orthologs will be reflected in the variability of single nucleotide polymorphisms (SNPs) that are localized in the vicinity of the corresponding loci in different human populations. Consistently with this notion, more diverged genes between humans and chimpanzees are more likely to be associated with human speciation and are anticipated to contain SNPs with reduced variability between different human populations. In order to test this hypothesis, we have compared the rate of non synonymous nucleotide substitutions (Ka) between 255 chimpanzee and human orthologs with the average deviation in the allelic frequencies of corresponding closely linked SNPs in two distinct human populations: The Yoruba people in Ibadan, Nigeria (YRI) and US residents with ancestry from Northern and Western Europe, collected in 1980 by the Centre d’Etude du Polymorphisme Humain (CEU). We found a significant (p < 0.05) negative association between the Ka and the degree of variation in the corresponding allelic frequencies between the human populations which implies that the most significant genes for human speciation are associated lower variability between the human populations examined. This observation is consistent with the strong selective advantage offered by these nucleotide substitutions during human evolution and predicts that a low polymorphic rate is consistent with the presence of genes with an essential role in human speciation.

The Quasimetrization Problem in the (Bi)topological Spaces
Athanasios Andrikopoulos
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/76904
Abstract: It is our main purpose in this paper to approach the quasi-pseudometrization problem in (bi)topological spaces in a way which generalizes all the well-known results on the subject naturally, and which is close to a “Bing-Nagata-Smirnov style” characterization of quasi-pseudometrizability.
Symmetry Conditions on the Coincidence of Some Notions of Quasi-Uniform Completeness
Athanasios Andrikopoulos
International Journal of Mathematics and Mathematical Sciences , 2007, DOI: 10.1155/2007/87592
Abstract: We generalize the notions of quietness and semisymmetry defined by Doitchinov (1991) and Deák (1991) and we study the role of these extended notions on the coincidence of some well-known quasi-uniform completeness. In particular, it is shown that the bicompletion coincides (up to quasi-uniformism) with the standard D-completion in quiet ⋆-weakly pair Cauchy bounded quasi-uniform spaces and it coincides with ⋆-half-com- pletion defined by Romaguera and Sánchez-Granero (2002), in T0-weakly quiet quasi-uniform spaces.
Goodbye to 'one by one' genetics
Athanasios Theologis
Genome Biology , 2001, DOI: 10.1186/gb-2001-2-4-comment2004
Abstract: One of the major problems that humans face as we enter the twenty-first century is how to feed an overpopulated planet. Currently, the world population is approximately six billion people, and it is estimated that with the current birth rate it will double by 2050 [1]. The consequence of such growth is that humans will be forced to carry out agriculture using less, and lower quality, farming land. In order for us to be successful under these adverse conditions, a highly sophisticated knowledge of plant biology will be required that will allow the development of agronomically important species suitable for producing more food per unit farming area. The introduction of Arabidopsis as a model plant species fifteen years ago has revolutionized plant biology and provides opportunities for achieving this goal. Arabidopsis was adopted as a model organism by plant geneticists because of its small diploid genome, low repetitive DNA content, and rapid reproductive cycle [2]. Arabidopsis appears to contain homologs of most of the genes found in agronomically important crop plants, including rice, maize, soybean, and tomato [3].It is axiomatic that technology advances biology and vice versa. The sequencing of the mustard weed genome [4], together with the genomes of other eukaryotes - yeast [5,6], worm [7], fly [8] and human [9,10], reaffirms the validity of this axiom. It has been only 48 years since the structure of the DNA was elucidated [11] and almost 30 years since the first DNA molecule was cloned and propagated in Escherichia coli [12]. Subsequently, recombinant DNA technology was developed that allowed biologists to clone and study genes 'one by one', laying the foundations for the biotechnology industry [13,14]. After 20 years, however, the 'one by one' approach was not revealing information fast enough to allow understanding of the complexity of biological systems. It was also very expensive. It costs $10 to $20 per base to sequence your favorite gene in a timely man
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