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Search Results: 1 - 10 of 224 matches for " Vedat;Gurel "
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Reactive Nitrogen and Oxygen Intermediates in Patients with Cutaneous Leishmaniasis
Erel, Ozcan;Kocyigit, Abdurrahim;Bulut, Vedat;Gurel, Mehmet Salih;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000200009
Abstract: the metabolisms of reactive nitrogen and oxygen intermediates (rni and roi) in patients with cutaneous leishmaniasis (cl) were investigated and compared with those of healthy subjects. to determine rni metabolism, nitrite plus nitrate concentrations were measured spectrophotometrically. nitrite concentration in plasma was determined directly by the griess method. nitrate levels in plasma were measured after reduction into nitrite by using copper-cadmium-zinc. roi metabolism was evaluated by measuring erythrocyte superoxide dismutase, catalase and glutathione peroxidase activities. plasma nitrite plus nitrate levels and erythrocyte superoxide dismutase activity were higher in the patient group than healthy subjects (p<0.01). in contrast, erythrocyte catalase and glutathione peroxidase activities were lower (p<0.05, p<0.01, respectively). roi metabolism was altered in relation to hydrogen peroxide elevation in patients with cl. these alterations in roi enable nitric oxide (no) to amplify its leishmanicidal effect. the determination of roi and rni in patients with cl may be a useful tool to evaluate effector mechanisms of no and clinical manifestations.
Reactive Nitrogen and Oxygen Intermediates in Patients with Cutaneous Leishmaniasis
Erel Ozcan,Kocyigit Abdurrahim,Bulut Vedat,Gurel Mehmet Salih
Memórias do Instituto Oswaldo Cruz , 1999,
Abstract: The metabolisms of reactive nitrogen and oxygen intermediates (RNI and ROI) in patients with cutaneous leishmaniasis (CL) were investigated and compared with those of healthy subjects. To determine RNI metabolism, nitrite plus nitrate concentrations were measured spectrophotometrically. Nitrite concentration in plasma was determined directly by the Griess method. Nitrate levels in plasma were measured after reduction into nitrite by using copper-cadmium-zinc. ROI metabolism was evaluated by measuring erythrocyte superoxide dismutase, catalase and glutathione peroxidase activities. Plasma nitrite plus nitrate levels and erythrocyte superoxide dismutase activity were higher in the patient group than healthy subjects (p<0.01). In contrast, erythrocyte catalase and glutathione peroxidase activities were lower (p<0.05, p<0.01, respectively). ROI metabolism was altered in relation to hydrogen peroxide elevation in patients with CL. These alterations in ROI enable nitric oxide (NO) to amplify its leishmanicidal effect. The determination of ROI and RNI in patients with CL may be a useful tool to evaluate effector mechanisms of NO and clinical manifestations.
Adenosine Deaminase Activities in Sera, Lymphocytes and Granulocytes in Patients with Cutaneous Leishmaniasis
Erel Ozcan,Kocyigit Abdurrahim,Gurel Mehmet Salih,Bulut Vedat
Memórias do Instituto Oswaldo Cruz , 1998,
Abstract: Adenosine deaminase (ADA) activities in sera, lymphocytes and granulocytes in patients with cutaneous leishmaniasis were investigated and compared with control groups. Fifty patients and 50 healthy individuals were studied. The clinical diagnosis was parasitologically confirmed by culture and Giemsa stain. ADA activities were measured by colorimetric method. Serum ADA activities 37.80 ± 11.90, 18.28 ± 6.08 IU/L (p<0.0001), lymphocyte specific ADA activities 14.90 ± 7.42, 8.38 ± 7.42 U/mg protein (p = 0.04), granulocyte specific ADA activities 1.15 ± 0.73 , 1.09 ± 0.67 U/mg protein ( p>0.05) were found in patients and control groups, respectively. ADA activity increases in some infectious diseases were cell mediated immune mechanisms are dominant. In cutaneous leishmaniasis, lymphokine-mediated macrophage activity is the main effector mechanism. Increase in serum and lymphocyte ADA activities in patients with cutaneous leishmaniasis may be dependent on and reflects the increase in phagocytic activity of macrophages and maturation of T-lymphocytes.
Adenosine Deaminase Activities in Sera, Lymphocytes and Granulocytes in Patients with Cutaneous Leishmaniasis
Erel, Ozcan;Kocyigit, Abdurrahim;Gurel, Mehmet Salih;Bulut, Vedat;Seyrek, Adnan;Ozdemir, Yuksel;
Memórias do Instituto Oswaldo Cruz , 1998, DOI: 10.1590/S0074-02761998000400014
Abstract: adenosine deaminase (ada) activities in sera, lymphocytes and granulocytes in patients with cutaneous leishmaniasis were investigated and compared with control groups. fifty patients and 50 healthy individuals were studied. the clinical diagnosis was parasitologically confirmed by culture and giemsa stain. ada activities were measured by colorimetric method. serum ada activities 37.80 ± 11.90, 18.28 ± 6.08 iu/l (p<0.0001), lymphocyte specific ada activities 14.90 ± 7.42, 8.38 ± 7.42 u/mg protein (p = 0.04), granulocyte specific ada activities 1.15 ± 0.73 , 1.09 ± 0.67 u/mg protein ( p>0.05) were found in patients and control groups, respectively. ada activity increases in some infectious diseases were cell mediated immune mechanisms are dominant. in cutaneous leishmaniasis, lymphokine-mediated macrophage activity is the main effector mechanism. increase in serum and lymphocyte ada activities in patients with cutaneous leishmaniasis may be dependent on and reflects the increase in phagocytic activity of macrophages and maturation of t-lymphocytes.
Source Field Effects and Wave Function Collapse
Atilla Gurel,Zeynep Gurel
Physics , 2003,
Abstract: Detection of a material particle is accompanied by emission of bremsstrahlung. Thus the dynamics of the energy loss of the particle is determined by radiation reaction force. The description of radiation reaction is a difficult problem still being subject of ongoing debates. There are problems of runaway solutions, preacceleration already in classical description of radiation reaction. Additional complications in quantum mechanical description arise because of the infinite source field energy term in hamiltonian for a point charge. There is still no general consensus on an appropriate quantum mechanical description. Neither the achievements of the radiation theory on the subject nor the problems associated with it are sufficiently taken into account in context with measurement problem. Radiation reaction doesn't effect free particle wave packets, but it favors stationary states of the `wave function of the measured particle" in presence of a potential gradient. We suggest therefore that radiation reaction may play a significant role in the dynamics of the wave function collapse. keywords: wave function collapse,interpretation,randomness, Jaynes Cummings dynamics, spontaneous emission, source field effects, radiation reaction, quantum measurement,decoherence
Seasonal Variation of Heavy Metals in Shrimp Penaeus kerathurus (Forskal, 1775) from Izmir Bay, Turkey
Gurel Turkmen
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2839.2844
Abstract: Seasonal changes in heavy metals (Cd, Cu, Fe, Pb, Zn) concentrations in muscle tissues of both male and female caramote shrimp (Penaeus kerathurus) from Izmir bay, Turkey were measured for a year period by using flame and graphite furnace AAS. The relationships in various heavy metal concentrations were compared according to sex and seasons. Heavy metal content varied with type of metals, seasons and sex. The highest concentration of heavy metal in the muscle tissue of P. kerathurus for Cd, Pb, Cu, Fe and Zn was registered in Summer months. Mean Fe level in male shrimps was considerably higher (30.19 compared to 20.23 μg g-1 dry weight) in October. Regarding Cu, the same case could be observed (27.58 μg g-1 dry weight in males compared to 19.02 in females). In the present study, heavy metals accumulated in the shrimp muscle in the order Zn>Fe>Cu>Pb>Cd. Concentrations of metals ranged within the recommended limits for human consumption and not represent a health risk.
Design and Simulation of Circular Arrays of Trapezoidal-Tooth Log-Periodic Antennas via Genetic Optimization
Levent Gurel
PIER , 2008, DOI: 10.2528/PIER08081809
Abstract: Circular arrays of log-periodic (LP) antennas are designed and their operational properties are investigated in a sophisticated simulation environment that is based on the recent advances in computational electromagnetics. Due to the complicated structures of the trapezoidal-tooth array elements and the overall array configuration, their analytical treatments are prohibitively difficult. Therefore, the simulation results presented in this paper are essential for their analysis and design. We present the design of a threeelement LP array showing broadband characteristics. The directive gain is stabilized in the operation band using optimization by genetic algorithms. We demonstrate that the optimization procedure can also be used to provide beam-steering ability to LP arrays.
Epidemiology of Dissociative Disorders: An Overview
Vedat Sar
Epidemiology Research International , 2011, DOI: 10.1155/2011/404538
Abstract: General psychiatric assessment instruments do not cover DSM-IV dissociative disorders. Many large-scale epidemiological studies led to biased results due to this deficit in their methodology. Nevertheless, screening studies using diagnostic tools designed to assess dissociative disorders yielded lifetime prevalence rates around 10% in clinical populations and in the community. Special populations such as psychiatric emergency ward applicants, drug addicts, and women in prostitution demonstrated the highest rates. Data derived from epidemiological studies also support clinical findings about the relationship between childhood adverse experiences and dissociative disorders. Thus, dissociative disorders constitute a hidden and neglected public health problem. Better and early recognition of dissociative disorders would increase awareness about childhood traumata in the community and support prevention of them alongside their clinical consequences. 1. Introduction Dissociation is defined as a disruption in the usually integrated functions of consciousness, memory, identity, or perception of the environment [1]. Dissociative disorders constitute a group of clinical syndromes covering disturbances attributed to one or more of these domains. Dissociation may be sudden or gradual, transient, or chronic. Being the most chronic and complex type of dissociative disorders, dissociative identity disorder (DID) constitutes an overarching syndrome covering all dissociative phenomena. Depersonalization disorder, dissociative amnesia, and dissociative fugue are further categories of dissociative disorders. Dissociative conditions which do not fit diagnostic criteria of these specific categories are diagnosed as having dissociative disorder not otherwise specified (DDNOS). Although not specified as such in official classification systems, the concept of chronic complex dissociative disorder deserves a rather detailed description here, because it is a significant category for epidemiological studies in particular. Due to the tight definition of DID in DSM-IV [1], a larger group of subjects who are close to DID in their symptomatology are being diagnosed as having the type-1 of the dissociative disorder not otherwise specified (DDNOS-1). The latter group is consisted of the subjects who have identity alteration without dissociative amnesia or whose identity alteration is too mild to fit the diagnostic criterion of DID. In fact, the difference between two categories is a matter of severity but not a qualitative one. Thus, DID and DDNOS-1 constitute the chronic complex
Relocating Sensor Nodes to Maximize Cumulative Connected Coverage in Wireless Sensor Networks
Vedat Coskun
Sensors , 2008, DOI: 10.3390/s8042792
Abstract: In order to extend the availability of the wireless sensor network and to extract maximum possible information from the surveillance area, proper usage of the power capacity of the sensor nodes is important. Our work describes a dynamic relocation algorithm called MaxNetLife, which is mainly based on utilizing the remaining power of individual sensor nodes as well as properly relocating sensor nodes so that all sensor nodes can transmit the data they sense to the sink. Hence, the algorithm maximizes total collected information from the surveillance area before the possible death of the sensor network by increasing cumulative connected coverage parameter of the network. A deterministic approach is used to deploy sensor nodes into the sensor field where Hexagonal Grid positioning is used to address and locate each sensor node. Sensor nodes those are not planned to be actively used in the close future in a specific cell are preemptively relocated to the cells those will be in need of additional sensor nodes to improve cumulative connected coverage of the network. MaxNetLife algorithm also includes the details of the relocation activities, which include preemptive migration of the redundant nodes to the cells before any coverage hole occurs because of death of a sensor node. Relocation Model, Data Aggregation Model, and Energy model of the algorithm are studied in detail. MaxNetLife algorithm is proved to be effective, scalable, and applicable through simulations.
Monitoring Red Deer and Roe Deer Population Density in Yedigoller-Yesiloz Wildlife Reserves in Turkey
Vedat Beskardes
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.1356.1361
Abstract: Wildlife inventories are very new in Turkey. Thus, there is no enough data about red deer and roe deer population. However, these studies have gained momentum in recent years. In this study, it is aimed to determine and to monitor status of red deer and roe deer population densities. In the study, it was used a kind of drive count which was combined with point count. The study was conducted between 2003 and 2010 in October, once a year. Red deer and roe deer densities were determined between 0.45 and 1.19 red deer/km2; 1.48 and 2.05 roe deer/km2. Also, average of annual growth rates were estimated for red deer (0.135) and roe deer (-0.0059). The study showed that whilst the red deer population has been increasing, roe deer population has been decreasing in long term period.
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