AXSIS (Yeditepe Üniversitesi)
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Haemangioma originating from a tendon sheath as an unusual cause of trigger wrist: Case report
No full textHaemangioma localised in the wrist originating from the sheath of the fifth deep flexor tendon and obstructing the movement of the tendon through the carpal tunnel as an unusual cause of trigger wrist is presented. Tumoural masses around the wrist can cause triggering by obstructing the movement of tendons through the carpal tunnel and the clinician should consider other causes of triggering for surgical treatment.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Enamel matrix proteins in the treatment of periodontal sites with horizontal type of bone loss
No full textObjectives: The present study aims to assess the clinical and radiographic outcome of horizontal type of bone loss over a period of 8 months following periodontal surgery with adjunctive use of enamel matrix proteins (EMP). Materials and Methods: Twenty patients, who received nonsurgical periodontal therapy and had radiographic horizontal bone loss with an associated probing depth (PD) of ≥4 mm at the maxillary incisor/canine segment, were included. One side of the selected segment divided by the mid-sagittal plane was treated with EMP as part of a crevicular flap. The other side was treated either with a similar intracrevicular (ICI) or a reverse bevel incision (RBI) as part of a conventional flap debridement. Therefore, patients were divided into two groups of 10 patients according to the type of incision performed on the control side. The analysis was based on a classification of two severity groups according to preoperative PD, with the patient's means of measurements for each treatment being the experimental units for the statistical analysis. Results: For pockets of 4-6 mm, EMP treatment was significantly better than the ICI/ flap debridement in terms of PD reduction (p < 0.001), relative attachment level (RAL) gain (p < 0.001) and recession (REC) (p < 0.05). Although sites exposed to EMP treatment exhibited significantly greater RAL gain than RBI/flap debridement sites (p < 0.01), both treatments resulted in equally effective PD reduction. Less REC occurred with EMP application than with ICI-RBI/flap debridement (p < 0.05). Treatment of shallow sites by the conventional flap with both incisions resulted in a tendency for loss of attachment whereas EMP treatment maintained the attachment levels. No significant difference in the degree of probing and radiographic bone levels was found between the treatments. Conclusion: EMP treatment showed better clinical improvements as compared to the conventional flap debridement performed with two different incisions. Clinical improvements were more pronounced at periodontal sites with deep, rather than shallow, periodontal pockets. The results of this study provided an important preliminary base for further clinical and histologic studies.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Tipik antipsikotiklerle tedavi edilen şizofreni hastalarında koroner kalp hastalığı riskinin değerlendirilmesi
No full textObjective: Increased risk of atherosclerosis and sudden cardiac death in patients with schizophrenia regardless of the effect of antipsychotic agents are discussed in recent studies. Our aim in this study is to evaluate coronary heart disease risk factors in patients with schizophrenia. Method: Sixty-nine in patients with schizophrenia who were treated only with typical antipsychotic medications were included in this cross sectional case control study. Age, tobacco consumption, body mass index, arterial blood pressure and laboratory tests including total cholesterol, HDL, LDL, triglycerides, albumin, uric acid, fasting glucose and postprandial glucose levels were evaluated. Coronary hearth disease risks of the patients were estimated by using Framingham Risk Prediction Charts. The obtained data were compared with 26 healthy age and gender matched comparison subjects. Results: The mean estimated coronary heart disease risk sum is 5.99 in patients with schizophrenia and 6.46 in control. The difference between two groups was not statistically significant. Interestingly, there was a continual increase of serum HDL levels, that is known as a protective factor from atherosclerosis with progressive age in patients with schizophrenia but an opposite tendency was found in controls. Conclusions: The estimated risk of coronary heart disease was not increased in patients with schizophrenia. It is thought that the lower HDL levels of younger patients with schizophrenia may partly explain premature deaths seen in schizophrenia.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
In vitro, spectroscopic study of the retina of adult frog's eye
No full textThe amphibian eye accomodates as a fish eye does, by moving the entire lens forward toward the cornea for seeing nearby objects and away from the cornea for seeing distant objects. Amphibians also adapt to changing light conditions by dilating the pupil in dim light and constricting it in bright light. Light exposure induces antioxidant enzyme activities in the eye tissues of frogs. All injuries by light lead to morphological changes of retina and pigment epithelium. The retina is susce ptible to lipid preoxidation and production of lipid hvdroperoxides has been observed in light-exposed retinas. The blue-sensitive rods, so called green rods are found in amphibian retina and constitute about 10 of total rod cells, electrophysiological and behavioural studies demonstrate that green rods participate in color coding in frog vision.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Energy and exergy analysis of a ladle furnace
No full textIn this work, the second law of thermodynamics is applied to the industrial ladle furnace (LF) with a capacity of 55-57 tons of melted steel to evaluate the physical exergy during the steel production process. A computer algorithm is developed to carry out the exergy analysis to the LF. The exergy efficiency of the ladle furnace is determined. As a result, loss exergy, exergies going into and out of the LF during the steel production process are identified and the ways of minimizing these losses in practice are discussed.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Interaction integrals of extended bodies and convolution/folding operation
No full textThe convolution, or folding, theorem related to Fourier transforms is applied to the evaluation of interaction integrals of certain extended bodies for the specific purpose of nuclear applications. The integrals give analytical results for a class of functions when chosen from among uniform sharp and leptodermous spheres, delta-points, Yukawa, and Coulomb shapes. Such shapes are convenient to use as models for source density and point-point interaction.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Combined wavelet-neural fault classifier for power distribution systems
No full textThis paper presents an integrated design of a fault classifier for distribution systems using a hybrid Waveletartificial neural network (ANN) based approach. Data for the fault classifier is produced by PSCAD/EMTDC simulation program for 34.5 kV Sagmalcilar-Maltepe distribution system in Istanbul, Turkey. It is aimed to design a classifier capable of recognizing ten classes of three-phase distribution system faults. A database of line currents and line-to-ground voltages is built up including system faults at different fault inception angles and fault locations. The characteristic information over six-channel of current and voltage samples is extracted by the wavelet multi-resolution analysis technique. Afterwards, an ANN-based tool was employed for classification task. The main idea in this approach is solving the complex fault (three-phase short-circuit) classification problem under various system and fault conditions. A self-organizing map, with Kohonen's learning algorithm and typeone learning vector quantization technique is implemented into the fault classification study. The performance of the wavelet-neural fault classifier is presented and the results are analyzed in the paper. It is shown that the technique presented correctly recognizes and discriminates the fault type and faulted phases(s) with a high degree of accuracy for different location and time of occurrence in the simulated model distribution system.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Triplet-Triplet absorption spectrum of 1,2,3,4-dibenzanthracene in EPA
No full textTriplet-triplet absorption spectrum was experimentally observed by flash and laser flash photolysis at room temperature. Dibenzanthracene molecules were excited in a two-step process. In the first step, an excited singlet is created which undergoes intersystem crossing to the lowest triplet state, then T-T absorption creates an excited triplet dibenzanthracene molecule, which returns to the ground state by radiationless transition or by phosphorescence or returns to the first excited singlet level by intersystem crossing. The recreated first excited singlet of dibenzanthracene decays back to the ground state by emitting B-type of delayed fluorescence which was observed at the same emission band of prompt fluorescence.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Enamel matrix proteins in the treatment of periodontal sites with horizontal type of bone loss
No full textObjectives: The present study aims to assess the clinical and radiographic outcome of horizontal type of bone loss over a period of 8 months following periodontal surgery with adjunctive use of enamel matrix proteins (EMP). Materials and Methods: Twenty patients, who received nonsurgical periodontal therapy and had radiographic horizontal bone loss with an associated probing depth (PD) of ≥4 mm at the maxillary incisor/canine segment, were included. One side of the selected segment divided by the mid-sagittal plane was treated with EMP as part of a crevicular flap. The other side was treated either with a similar intracrevicular (ICI) or a reverse bevel incision (RBI) as part of a conventional flap debridement. Therefore, patients were divided into two groups of 10 patients according to the type of incision performed on the control side. The analysis was based on a classification of two severity groups according to preoperative PD, with the patient's means of measurements for each treatment being the experimental units for the statistical analysis. Results: For pockets of 4-6 mm, EMP treatment was significantly better than the ICI/ flap debridement in terms of PD reduction (p < 0.001), relative attachment level (RAL) gain (p < 0.001) and recession (REC) (p < 0.05). Although sites exposed to EMP treatment exhibited significantly greater RAL gain than RBI/flap debridement sites (p < 0.01), both treatments resulted in equally effective PD reduction. Less REC occurred with EMP application than with ICI-RBI/flap debridement (p < 0.05). Treatment of shallow sites by the conventional flap with both incisions resulted in a tendency for loss of attachment whereas EMP treatment maintained the attachment levels. No significant difference in the degree of probing and radiographic bone levels was found between the treatments. Conclusion: EMP treatment showed better clinical improvements as compared to the conventional flap debridement performed with two different incisions. Clinical improvements were more pronounced at periodontal sites with deep, rather than shallow, periodontal pockets. The results of this study provided an important preliminary base for further clinical and histologic studies.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive.Materials and Methods: Twenty patients, who received nonsurgical periodontal therapy and had radiographic horizontal bone loss with an associated probing depth (PD) of 4 mm at the maxillary incisor/canine segment, were included. One side of the selected segment divided by the mid-sagittal plane was treated with EMP as part of a crevicular flap. The other side was treated either with a similar intracrevicular (ICI) or a reverse bevel incision (RBI) as part of a conventional flap debridement. Therefore, patients were divided into two groups of 10 patients according to the type of incision performed on the control side. The analysis was based on a classification of two severity groups according to preoperative PD, with the patient's means of measurements for each treatment being the experimental units for the statistical analysis
Evaluation of coronary heart disease risk in patients with schizophrenia who were treated with typical antipsychotics
No full textObjective: Increased risk of atherosclerosis and sudden cardiac death in patients with schizophrenia regardless of the effect of antipsychotic agents are discussed in recent studies. Our aim in this study is to evaluate coronary heart disease risk factors in patients with schizophrenia. Method: Sixty-nine in patients with schizophrenia who were treated only with typical antipsychotic medications were included in this cross sectional case control study. Age, tobacco consumption, body mass index, arterial blood pressure and laboratory tests including total cholesterol, HDL, LDL, triglycerides, albumin, uric acid, fasting glucose and postprandial glucose levels were evaluated. Coronary hearth disease risks of the patients were estimated by using Framingham Risk Prediction Charts. The obtained data were compared with 26 healthy age and gender matched comparison subjects. Results: The mean estimated coronary heart disease risk sum is 5.99 in patients with schizophrenia and 6.46 in control. The difference between two groups was not statistically significant. Interestingly, there was a continual increase of serum HDL levels, that is known as a protective factor from atherosclerosis with progressive age in patients with schizophrenia but an opposite tendency was found in controls. Conclusions: The estimated risk of coronary heart disease was not increased in patients with schizophrenia. It is thought that the lower HDL levels of younger patients with schizophrenia may partly explain premature deaths seen in schizophrenia.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive