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Search Results: 1 - 10 of 105 matches for " Abdurrahim;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.
The role of biotechnology on the treatment of wastes
H Buyukgungor, L Gurel
African Journal of Biotechnology , 2009,
Abstract: The biological processes improving fast are shown among the future technologies. In these processes which biological materials are used as degraders, raw wastes are processed to remove the contaminants in them. Biotechnological processes are used for wastewater treatment, gas treatment and disposal of solid wastes in environmental engineering. Also, these processes can be utilized for the production of biogas and hydrogen as new energy resources. For preventing environmental pollution in environmental engineering, activated sludge process, trickling filters, biotrickling filters, oxidation ponds, anaerobic treatment, composting units and biogas reactors are used extensively among the waste treatment technologies. In this review paper, the role of biotechnology on waste treatment was assessed and several treatment methods were investigated.
The Survey of the Imported Freshwater Decapod Species via the Ornamental Aquarium Trade in Turkey
Gurel Turkmen,Onur Karadal
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2824.2827
Abstract: In this study, the situation with imported freshwater decapod species via the live aquarium ornamental trade in Turkey was investigated year round during 2011. The scientific and common names, native geographic regions, import sizes and prices were recorded. Among the 28 imported freshwater decapod species recorded in this survey, 15 are shrimps, 9 are crayfish and 4 are crabs. Those imported species might have escaped or have been released into the wild due to misguided cultural habits or incorrect conservation concepts. The objective of this study is to raise awareness of imported freshwater decapods and to present a list of the species currently traded in the aquarium industry in Turkey.
Efficient Solutions of Metamaterial Problems Using a Low-Frequency Multilevel Fast Multipole Algorithm
Ozgur Ergul;Levent Gurel
PIER , 2010, DOI: 10.2528/PIER10071104
Abstract: We present fast and accurate solutions of electromagnetics problems involving realistic metamaterial structures using a lowfrequency multilevel fast multipole algorithm (LF-MLFMA). Accelerating iterative solutions using robust preconditioning techniques may not be sufficient to reduce the overall processing time when the ordinary high-frequency MLFMA is applied to metamaterial problems. The major bottleneck, i.e., the low-frequency breakdown, should be eliminated for efficient solutions. We show that the combination of an LF-MLFMA implementation based on the multipole expansion with the sparse-approximate-inverse preconditioner enables efficient and accurate analysis of realistic metamaterial structures. Using the robust LF-MLFMA implementation, we demonstrate how the transmission properties of metamaterial walls can be enhanced with randomlyoriented unit cells.
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