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Search Results: 1 - 10 of 1322 matches for " Alper Kaya "
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Fairy Chimneys of Cappadocia and Their Engineering Properties
Alper Baba,Abidin Kaya,Necdet Turk
Journal of Applied Sciences , 2005,
Abstract: The Cappadocia region of inner Anatolia has been focus of both historians and geologists due to its underground cities as well as fairy chimneys on the surface. The man-made structures were caved in soft tuffs more than 1500 years ago; thus, many researchers studied the mass properties of rackous materials in the region to evaluate as construction materials. In this study physical and chemical properties of spectacular structures, called fairy chimneys formed due to physicochemical reaction on the surface were investigated. Fairy chimneys are formed of a cap, a neck and a supporting body. Thus, samples were collected for both physical and chemical analyses of caps, necks and bodies of the fairy chimneys found in the Cappadocia region. Chemical analyses of fairy chimneys revealed that not only the chemical compositions of fairy chimneys are different from the background tuffous rocks but also the chemical composition of the fairy chimney parts, namely cap, neck and body. The chemical analysis of fairy chimney showed that cementation agents such as Fe2O3 and CaO play significant role on the development of fairy chimneys. Similar to the chemical composition variations, geotechnical properties of fairy chimneys also showed variations. For example, point load index of fairy chimneys in Bagli creek is higher than those of Pasabagi creek for both neck and body. Both chemical and mechanical analyses of fairy chimneys indicated that there is a positive correlation between the content of cementations elements and mechanical properties and size of the fairy chimneys.
A Research on Determining the Most Suitable Harvest Maturity of the Kiwifruits (Actinidia deliciosa cv. Hayward) Harvested at Different Time Intervals
Kenan Kaynas,Alper Dardeniz,Seckin Kaya
Journal of Applied Sciences , 2002,
Abstract: This research was carried out to investigate regional maturity characteristics and to determine the suitable criteria for the best harvest time of the Kiwifruits in Canakkale – Umurbey conditions for short time storage. For this purpose Kiwifruits harvested at 10 day intervals from November 15th to October 25th, from the vines that was planted as Kiwifruit cv. Hayward. Two years results showed that there were important differences in different criteria; % total soluble solid content, fruit firmness and affective evaluation tests, which were carried out to determine maturation and also in other criteria, % Total Soluble Solid Content (%TSSC), titrable acidity and fruit firmness tests, analyzed to determine the proper harvest maturity. According to the results, the proper harvest time was when the fruit weight was approximately 48-49 mm; the fruit length, approximately 63-64 mm; soluble solids % 8-8,5 and fruit firmness 8,5-9,5 kg/cm2 for the Kiwifruit cv. Hayward in Umurbey conditions.
Preemptive Analgesic Effects Of Caudal Block In Paediatr c Patients Undergoing Orthopaedic Surgey
Alper Kararmaz,Sedat Kaya,Haktan Karaman,Selim Turhano?lu
Dicle Medical Journal , 2003,
Abstract: We examined preemptive analgesic effect of caudal block in patients undergoing orthopaedic hip or lower extremities surgery.Forty children between ages of 1-12 years whom orthopaedics hip and or lower extremities surgery would be applied to were included into study. Fifteen minutes before surgical incision, in Group I, 0.125% bupivacaine 0.5 ml/kg was given for caudal anaesthesia. In Group II, caudal block was postoperatively applied with the same dose of drug. During postoperative period, patients were followed for 48 hours, and OPS “objective pain scale”, time to demand of first analgesic, and total analgesic consumption were recorded. In Group II, OPS score and total analgesic consumption were higher in initial 8 hours (P<0.05, P<0.001). Duration of first analgesic application was longer in Group I (P<0.001).We concluded that preoperative caudal block has preemptive analgesic effect in children undergoing orthopaedic surgery.
The Retrospective Analysis of the Poisoning Cases in Intensive Care Unit
Sedat Kaya,Alper Kararmaz,Haktan Karaman,Selim Turhano?lu
Dicle Medical Journal , 2006,
Abstract: The aim of this study is to examine retrospectively patients who were diagnosed and followed as intoxication between 2003-2005 in our intensive care unit.Forty-four patients were female (80%), and 11 were male (20%). The overall mean age was 23.6 8.9. Except one, all patients took drugs for suicide. The most common poisons ingested were pesticides (49%). Frequently used drugs were antidepressants (31%). Thirty-four patients (62%) were intubated for mechanical ventilation support. Mean duration of mechanical ventilation was 8.5 10.6 day. Forty-seven patients (85%) were discharged from hospital, 2 patients (4%) were transported to another unit and 6 patients (11%) were died. We concluded that, during study period, young female patients were admitted more frequently in our intensive care unit, and pesticide and antidepressants were most common cause of the poisoning.
Case Report: Anaesthetic Approach For Emergency Surgery In A Patient With Acute Myocardial Infarction
Alper Kararmaz,Sedat Kaya,Tülin Tekeli,Selim Turhano?lu
Dicle Medical Journal , 2003,
Abstract: In this case report, we examined anaesthetic approach for emergency surgery in a patient with acute myocardial infarction and stomach perforation at the same time.Anaesthesia was induced with midazolam, propofol, fentanyl and vecuronium, and maintained with sevoflurane 1-2% in 100% oxygen, fentanyl and vecuronium. Patient controlled analgesia with morphine was used for postoperative analgesia. At postoperative 17th day, the patient was discharged from the hospital as health.
The Ultrastructural Analyses of Meniscus Histology in Osteoarthritic Knees
Alper Kaya,Sibel Serin K?l??o?lu,Berk Gü?lü,Esra Erdemli
Romatizma , 2009,
Abstract: Objective: Menisci are fibrocartilage tissue that have many functions in the knee joint. Studies showed the early progression of osteoarthrtic changes after meniscectomy. The osteoarthritic knee has some meniscal changes associated with articular cartilage degeneration. This study aimed to investigate the ultrastructural meniscal changes in degenerated knee joints. Materials and Methods: Samples were excised from patients who underwent total knee arthroplasty for primary varus osteoarthritis of the knee joint. Twenty medial menisci were examined histologically by light microscopy and transmission electron microscopy and compared with two normal menisci samples. Results: Ultrastructure of the tissue specimens taken from the pathologic meniscus group demonstrated a heterogeneous course in the collagen fibers. It was composed of concentric lamellae of fibrous bundles that were disorganized in some areas. Moreover, the amount of collagen fibers was decreased qualitatively in these groups. While metachromasia was remarkable around nearly all of the chondrocytes in the control group, it was detected especially in the matrix of the cell proliferation region in the degenerated meniscus group. Chondrocytes were oval and elongated cells in the degenerated menisci. The territorial matrix was mostly sparse or absent in the degenerated menisci; however, there were also instances where a typical chondrocyte was surrounded by territorial matrix containing proteoglycan particles and fibrils. Intracytoplasmic small lipid droplets in the chondrocytes of normal meniscus were also present but they were of more frequent occurrence and more prominent in size in the degenerated meniscus group. Electron dense gigantic calcified bodies in the intercellular matrix were also seen in the degenerated menisci specimens. One of the important findings of the study is the decreased synthesis of glycosaminoglycan in the degenerated menisci.Conclusion: This study shows the secondary structural changes of the meniscus in the osteoarthritic knee joint.
The early predictors of ventricular remodeling after myocardial infarction: the role of tumor necrosis factor-alpha
Ergün Bar?? Kaya,Necla ?zer,Onur Sinan Deveci,Alper Kepez
Anadolu Kardiyoloji Dergisi , 2009,
Abstract: Objective: Ventricular remodeling (VR) is a pathologic process characterized by progressive ventricular dilatation occurring after acute myocardial infarction (MI) leading to left ventricular systolic dysfunction. The purpose of the study was to evaluate the efficacy of plasma tumor necrosis factor alpha (TNF-α) levels to predict the left VR.Methods: This prospective observational cohort study included 72 consecutive patients with newly diagnosed MI with age ranging between 38-87 years (mean 59 ± 12 years). Control group was consisted of 30 patients with no additional systemic disease and normal coronary arteriograms. Transthoracic echocardiography was performed to all patients and controls both in the beginning of the study and in the 6th follow-up. A coronary arteriography was also performed to all patients. Patients with an increment in the diastolic volume index more than 20% in the follow-up compared with basal values included in the VR subgroup. The patient subgroup with VR consisted of 19 patients. Statistical analyses were performed using ANOVA and Kruskal Wallis tests for comparison of variables between groups. Logistic regression and ROC analyses were used for evaluation of accuracy of TNF-alpha in prediction of VR.Results: There were no significant differences between groups according to demographic characters. The basal plasma levels of TNF-α were higher in the patient subgroup with VR as compared with patients without VR and controls (14.59 ± 4.28 pg/ml vs 7.30 ± 4.48 pg/ml, and 1.64 ± 1.49 pg/ml, p < 0.001). In logistic regression analysis only TNF-α predicted the VR (OR-1.356, 95% CI 1.117-1.647). Plasma TNF-α levels with a cut-off ≥ 10.33 pg/ml were found to have 89.5% sensitivity and 79.3% specificity to predict the development of VR.Conclusion: These results demonstrate the increment of plasma TNF-α levels in the acute phase of MI and the close relationship between the TNF-α levels and VR in the patients with first MI.
Evaluation of the influence of smear layer removal on the sealing ability of two different obturation techniques
Alper Kustarci,Betül Kaya,Dilara Arslan,Kerem Engin Akp?nar
Cumhuriyet Dental Journal , 2011, DOI: 10.7126/cdj.2012.578
Abstract: Purpose: This study investigates the effects of Nd:YAG laser irradiation and 17% EDTA irrigation on apical seals with clearing technique, when used prior to two root canal filling techniques. Material and Methods: Sixty freshly extracted human mandibular premolar and canine teeth, each with one root canal, were instrumented with Protaper rotary nickel-titanium instruments and then randomly divided into six groups according to the final irrigation solutions and Nd:YAG laser irradiation for smear layer removal and obturation techniques employed: Group I: 2.5% sodium hypochlorite (NaOCl) and cold lateral condensation technique, Group II: 17% EDTA and cold lateral condensation technique, Group III: Nd:YAG laser and cold lateral condensation technique, Group IV: 2.5% NaOCl and thermoplasticised injectable gutta-percha technique (Dia-Gun system), Group V: 17% EDTA and Dia-Gun system, Group VI: Nd:YAG laser and Dia-Gun system. After obturation, the root surfaces were coated with a double layer of nail varnish, with the exception of the apical 2 mm, and placed in indian ink for 7 days. All samples were rendered transparent to measure the maximum linear dye penetration. Results: Group 1 showed significantly greater dye leakage compared with groups 5 and 6 (P<0.05). However, no significant difference was found between other groups (P>0.05). Canals obturated with Dia-Gun system showed less mean dye leakage than canals obturated with lateral condensation. Groups, finally irrigated with 17%EDTA and irradiated with Nd:YAG laser, were showed lower mean dye leakage than control groups for both obturation techniques. Conclusion: Under in vitro conditions, we found that smear layer removal improved the ability of the filling materials to prevent the fluid movement. Also, Dia-Gun system showed less apical leakage than cold lateral condensation technique in the presence or absence of the smear layer.
Effects of intravenous anesthetic agents on vascular endothelium
Alp Gurbet,Fatma Nur Kaya,Alper Bayraktar,?lkin Cavu?o?lu
Journal of Clinical and Experimental Investigations , 2012,
Abstract: Objectives: The objective of this study was to comparethe effects of Propofol 1%, Propofol 2%, Ketamine, Pentothal,Etomidate and Etomidate-lipuro on venous endothelium.Materials and methods: The study was done fromAugust 2007 to May 2008 after approval of Faculty’sEthic Committee. Forty rabbits were obtained. Propofol1% (n=6), Propofol 2% (n=6), Ketamin (n=6), Penthotal(n=6), Etomidate (n=6), Etomidate lipuro (n=6) and normalsaline (Control Group, n=4) was given 1 cc via externaljugular vein. After 5 minutes from the injenction 6species 2 mm in length segments were taken from theinjencted veins. Species were fixed in 4 C gluteraldehydethan postfixed in 4°C osmium tetroxide. Visualisation wasperformed with scanning electron microscope.Results: In Propofol 1 %, Propofol 2% and Penthotalgroups normal endothelial structures were observed. InEtomidate group damage of the endothelial cells were observedsignificantly compared with control. In Etomidatelipuro group minimal deformation was observed comparedto control.Conclusion: Etomidat causes significant endothelial deformation,moreover lipuro minimalises these effects. Inorder to need to use etomidate for general anesthesia,for less pain during injection depending on vascular injurylipuro form would be more appropriate. However, furtherstudy is required. J Clin Exp Invest 2011; 3(2): 164-167
Cemented versus Uncemented Oxford Unicompartmental Knee Arthroplasty: Is There a Difference?
Burak Akan,Dogac Karaguven,Berk Guclu,Tugrul Yildirim,Alper Kaya,Mehmet Armangil,Ilker Cetin
Advances in Orthopedics , 2013, DOI: 10.1155/2013/245915
Abstract: Purpose. The use of uncemented unicompartmental knee prostheses has recently increased. However, few studies on the outcomes of uncemented unicompartmental knee prostheses have been performed. The purpose of this study was to compare the outcomes of cemented and uncemented Oxford unicompartmental knee arthroplasty. Materials and Methods. This retrospective observational study evaluated the clinical and radiological outcomes of 263 medial Oxford unicompartmental prostheses (141 cemented, 122 uncemented) implanted in 235 patients. The mean follow-up was 42 months in the cemented group and 30 months in the uncemented group. Results. At the last follow-up, there were no significant differences in the clinical results or survival rates between the two groups. However, the operation time in the uncemented unicompartmental knee arthroplasty group was shorter than that in the cemented unicompartmental knee arthroplasty group. In addition, the cost of uncemented arthroplasty was greater. Conclusion. Despite the successful midterm results in the uncemented unicompartmental knee arthroplasty group, a longer follow-up period is required to determine the best fixation mode. 1. Introduction Unicompartmental knee replacement arthroplasty (UKA) has been a popular treatment of osteoarthritis since the 1970s. Initial reports showed high failure rates in short-term follow-ups [1]. Because of these high failure rates and instrumentation problems, the use of these implants decreased in the 1990s. However, during the last 20 years, UKA has become a well-established treatment method for unicompartmental osteoarthritis of the knee. Recent reports have described success rates of 90% or higher at a minimum 10-year follow-up [2, 3]. These higher success rates have been attributed to better surgical techniques, new implant designs, improved instrumentation, and careful patient selection [4]. With the improvements in surgical techniques and instruments, this procedure has many advantages over total knee replacement such as a smaller incision, less soft tissue injury, preservation of bone stock, preservation of normal knee kinematics, less morbidity because of minimal postoperative blood loss, lower infection rate, shortened hospital stay, and rapid recovery [5]. However, controversy on the validity and durability of UKA remains. Although UKA is associated with better clinical results than total knee replacement arthroplasty (TKA), registry data show higher revision rates [6]. On the other hand, Goodfellow et al. reported that the revision rate is a poor and misleading outcome and
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