S Felek

Firat University, Mezreh, Elazığ, Turkey

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Publications (7)17.48 Total impact

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    ABSTRACT: Cathepsin L1 (CatL1) is one of the major molecules in the excretory-secretory products of Fasciola hepatica and is secreted by all stages of the developing parasite; it is involved in tissue penetration, immune evasion, feeding and pathogenesis. Our aim in this study was to clone and characterise the F. hepatica CatL1 gene from a Turkish isolate. This is the first report of cDNA encoding CatL1 protein of F. hepatica from a Turkish isolate. Phylogenetic analysis based on the CatL1 showed that the Turkish isolate is genetically related to Asiatic isolates. The cathepsin L1 gene may be used for DNA vaccination and recombinant pro-tein derived from the gene can be used for serological diagnosis against F. hepatica in Turkey.
    Acta Parasitologica 09/2005; 50(3):244-248. · 0.91 Impact Factor
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    ABSTRACT: Despite major developments in the management of septic shock, the mortality rate had progressively increased. Ibuprofen has been shown to have beneficial physiological effects when used as a treatment. However, there are conflicting results with respect to survival. This study aims to investigate the effect of ibuprofen on vital functions, various physiological parameters and survival during endotoxic shock in rabbits. Twenty-eight New Zealand rabbits were randomly separated into four groups. The first group received only saline, the second was given 2 mg/kg intravenous endotoxin at t0, the third received 30 mg/kg ibuprofen 30 minutes after endotoxin administration, whilst the fourth group received ibuprofen 30 minutes before the endotoxin. Respiratory and heart rate, mean arterial blood pressure and rectal temperature were recorded. Complete blood counts were performed and thromboxane B2 was measured every 30 minutes for the first two hours, and then hourly over the course of the experiment. Urine samples were collected at the same time points for the measurement of prostaglandin E2. Ibuprofen was found to improve respiratory rate, heart rate, and arterial pressure. However, it did not improve the negative effects of endotoxin on body temperature, haematocrit values, white blood cell count, and thrombocyte number. Thromboxane B2 levels in group IV were significantly lower than in the other groups, and the increase started at a later timepoint. In ibuprofen-treated animals, Prostaglandin E2 levels stayed low for at least 90 minutes, but started to rise thereafter. While the average survival in Group II animals was 192.9 +/- 46.9 minutes, those of groups III and IV were 339.1 +/- 33.5 minutes (p < 0.05) and 383.0 +/- 39.6 minutes (p = 0.01), respectively. Ibuprofen appears to increase survival in endotoxic shock-induced animals. Therefore, it may be helpful for the prophylaxis and treatment of patients with, or who are likely to develop, septic shock.
    BMC Infectious Diseases 10/2002; 2(1):26. DOI:10.1186/1471-2334-2-26 · 2.61 Impact Factor
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    S Felek · K Demirdag · A Kalkan · A Akbulut ·

    Clinical Microbiology and Infection 03/2000; 6(2):111-4. DOI:10.1046/j.1469-0691.2000.00016-4.x · 5.77 Impact Factor
  • S Felek · A Arslan ·
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    ABSTRACT: This study was undertaken to develop a new Gram-staining machine controlled by a micro-controller and to investigate the quality of slides that were stained in the machine. The machine was designed and produced by the authors. It uses standard 220 V AC. Staining, washing, and drying periods are controlled by a timer built in the micro-controller. A software was made that contains a certain algorithm and time intervals for the staining mode. One-hundred and forty smears were prepared from Escherichia coli, Staphylococcus aureus, Neisseria sp., blood culture, trypticase soy broth, direct pus and sputum smears for comparison studies. Half of the slides in each group were stained with the machine, the other half by hand and then examined by four different microbiologists. Machine-stained slides had a higher clarity and less debris than the hand-stained slides (p < 0.05). In hand-stained slides, some Gram-positive organisms showed poor Gram-positive staining features (p < 0.05). In conclusion, we suggest that Gram staining with the automatic machine increases the staining quality and helps to decrease the work load in a busy diagnostic laboratory.
    Folia Microbiologica 06/1999; 44(3):333-7. DOI:10.1007/BF02818557 · 1.00 Impact Factor
  • S Felek · A Akbulut · A Kalkan ·

    Journal of Infection 06/1999; 38(3):201-2. DOI:10.1016/S0163-4453(99)90256-6 · 4.44 Impact Factor
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    ABSTRACT: We investigated the effects of several antibiotics and anti-inflammatory agents on the purified protein derivative (PPD) response in the rat. Animals were immunized with Mycobacterium bovis vaccine BCG. Antibiotics and anti-inflammatory drugs were administered at therapeutic doses for 10 d. Chloramphenicol, erythromycin, aspirin and ibuprofen suppressed the PPD response, but penicillin and acetaminophen had no significant effects.
    Infectious Diseases 02/1999; 31(2):169-71. DOI:10.1080/003655499750006227 · 1.50 Impact Factor
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    ABSTRACT: Retrospective evaluation of 16 cases of tuberculous meningitis revealed that BCG vaccination and tuberculin positivity were rare in pediatric as well as adult patients. Children with disease had developmental retardation and a high rate of maternal illiteracy as compared to normal controls.
    Journal of Tropical Pediatrics 07/1992; 38(3):116-8. DOI:10.1093/tropej/38.3.116 · 1.26 Impact Factor