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Öğe Asymptotic stability of solutions to perturbed linear difference equations with periodic coefficients(2002) Aydin K.; Bulgak H.; Demidenko G.V.We consider perturbed linear systems of difference equations with periodic coefficients. The zero solution of a nonperturbed system is assumed asymptotically stable, i.e., all eigenvalues of the monodromy matrix belong to the unit disk {|?| < 1}. We obtain conditions on the perturbation of this system under which the zero solution of the system is asymptotically stable and also establish continuous dependence of one class of numeric characteristics of asymptotic stability of solutions on the coefficients of the system.Öğe Efficacy of aprotinin treatment on bilateral blunt chest trauma created in rab(2013) Kaya H.; Kafali M.E.; Aydin K.; Kocak S.; Sahin M.; Duran A.; Gul M.Objectives: To investigate the effects of aprotinin, on blood gasses, oxidant-antioxidant status, and lung histopathology in an experimental bilateral blunt chest trauma model. Methods: Conducted at the Experimental Animal Laboratory of Meram Medical School at Selcuk University, Konya, Turkey, the study comprised 21 New Zealand female albino rabbits who were divided into three groups. Trauma was applied on the sham and aprotinin groups, which was administered intravenous Aprotinin 20.000 U/kg. Arterial blood samples were obtained from all rabbits at hours 0, 3, 24, and 96. At hour 96 after trauma, all rabbits were sacrificed using the decapitation method, and then blood and lung tissue samples were obtained. Blood nitric oxide, malondialdehyde and blood gas measurements were made. Histopathological changes in the lung were examined with a light microscope. Results: While no positive effect of aprotinin was observed on nitric oxide malondialdehyde and partial pressure of carbon dioxide values, it was seen to have an increasing effect on partial oxygen pressure level. Aprotinin had a partial effect on lung histopathology. Conclusion: Aprotinin was determined to have a positive effect on PO2 levels. We could not find any positive effects especially on alveolar haemorrhage.Öğe An estimate for the attraction domains of difference equations with periodic linear terms(2004) Aydin K.; Bulgak H.; Demidenko G.V.We consider the quasilinear systems of difference equations with periodic coefficients in linear terms. We obtain estimates for the attraction domain of the zero solution and establish inequalities for the norms of solutions. The results are stated in terms of Lyapunov-type matrix series.Öğe Evaluation of neonatal hypotonia [Hipotonik yenido?anin de?erlendirilmesi](2007) Aydin K.Hypotonia is one of the most important neurologic findings in neonatal period. The condition is usually evident at birth or is identified during early life as poor muscle tone results in an inability to maintain normal posture during movement and rest. Although neonatal hypotonia is frequently and easily recognized by the first pediatric examination of the newborn, the diagnostic work up is often complex and difficult. Advances in genetics and neurosciences have lead to recognition of newer diagnostic entities, and rapid molecular diagnosis is now possible for several conditions such as spinal muscular atrophy, congenital muscular dystrophies, and congenital myopathies. Mainly, causes of hypotonia can be divided as central or peripheral. Central causes are hypoxic lesions of the brain, chromosomal abnormalities, brain malformations, and metabolic disorders. Peripheral causes are spinal muscular atrophy and muscle disorders. Neurologic examination, neuroimaging, karyotype analysis, and molecular genetic tests are the most helpful diagnostic tools.Öğe Glutaric aciduria type 1: Report of two cases [Glutarik asidüri tip 1: İki vakanin takdimi](2007) Elmas Ş.; Kaya Ü.; Aydin K.; Energin V.M.Glutaric aciduria type 1 is an autosomal recessive metabolic disease that is due to a deficiency of glutaryl-Co-A dehydrogenase in the metabolism of lysine, hydroxylysine and tryptophane. It usually appears as the loss of gained motor skills, a previously well child suffering spastic cerebral palsy, choreoathetosis, dystonia and mental retardation following a febrile illness associated with acute mental deterioration in the first three years of life. Less commonly, it may clinically appear as a progressive course of mental deterioration or isolated macrocephaly. Here, we report a 23-month-old boy who could not speak or walk and an eight-month-old girl with seizures and loss of previously gained motor skills. The two cases, having frontotemporal atrophy and basal ganglia degeneration on cerebral magnetic resonance imagings, and increased glutaryl-carnitine, glutaric and 3-hydroxy glutaric acid levels in tandem-mass spectrometer and urine organic acid quantification by gas chromatography, were diagnosed as glutaric aciduria type 1. We report these two cases to emphasize that it is a rare disease and must be considered in the differential diagnosis of cerebral palsy.Öğe A rare cause of coma in pediatric patients: Beta-ketothiolase (2-methylacetoacetyl-Co A thiolase) deficiency [Çocuklarda komanin nadir bir nedeni: Beta-ketotiyolaz (2-metilasetoasetil-koenzim A tiyolaz) eksikli?i](Kare Publishing, 2007) Ünal E.; Güzeş E.A.; Aydin K.; Kaya Ü.; Energin M.Beta-ketothiolase deficiency is a rare inborn error of L-isoleucine catabolism and ketone body metabolism. We present a 13-month-old, girl with beta-ketothiolase deficiency who was admitted with rapidly progressive coma. Severe ketoacidosis and mild hyperammonemia was documented. This rare case was treated successfully during the acute episode.Öğe Sensitivity of Schur stability of systems of linear difference equations with constant coefficients(2011) Duman A.; Aydin K.In this work, sensitivity of the Schur stability and the ?*-Schur stability of linear difference equation systems with constant coefficients have been investigated, and new results on the sensitivity problem have been given. The results have applied the scalar-linear difference equations with order ? and supported with numerical examples and also compared with the existing ones in the literature. © 2011 Academic Journals.
