Birol Ozkalp

Livestock Central Research Institute, Engüri, Ankara, Turkey

Are you Birol Ozkalp?

Claim your profile

Publications (4)4.76 Total impact

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Tuberculosis (TB) which is still one of the important infectious diseases in the world as well as Turkey, results in high morbidity and mortality. Clinical mycobacteriology laboratories have crucial roles in the identification, typing and susceptibility testing of Mycobacterium tuberculosis. The aims of this study were the investigation of the isolation rate of M.tuberculosis complex (MTC) from the clinical specimens of TB-suspected patients and to compare identification of mycobacteria isolated from solid and/or liquid media by using BACTEC NAP and immunochromatographic TB Ag MPT64 rapid test. A total of 1670 patients who were admitted to outpatients clinics of our hospital and prediagnosed as TB, have been included in the study. All the patients were anti-HIV seronegative. NALC-NaOH method were used for decontamination/ homogenization, and preparations from samples were stained with Erlich-Ziehl-Neelsen method to detect acid-resistant bacilli (ARB) in direct microscopy. All of the samples were inoculated into BACTEC™ MGIT-960 (Becton Dickinson, USA) and Löwenstein-Jensen (LJ) media for cultivation and incubated at 37°C for 6-8 weeks. Mycobacteria that were grown in the media have been identified by BACTEC™ NAP (Becton Dickinson, USA) and TB Ag MPT64 rapid test (SD Bioline Ag MPT64 Rapid™; Standard Diagnostics, Korea). The culture positivity in the samples of TB-suspected patients was found to be 3.7% (63/1670) with LJ and/or MGIT-960 methods, whereas ARB positivity rate was 1.6% (28/1670). Fifty-three (84%) out of culture positive 63 samples have been identified as MTC by BACTEC NAP test, while 61 (97%) were found as MTC by TB MPT64 test. Considering BACTEC NAP test as the reference method, TB MPT64 test identified all the MTC strains correctly (sensitivity: 100%), however the false positivity rate was estimated as 12.7% (specificity: 87%). Of 53 MTC positive samples, 36 were sputum, four were bronchoalveolar lavage, four were urine, three were gastric fluid, three were pleural fluid, and one of each were abscess, peritoneal fluid and cerebrospinal fluid samples. ARB positivity rate was detected as 41.5% (22/53) among MTC culture positive samples. Of the patients who were infected with MTC, 72% (38/53) were male and 98% (52/53) were adults (age range: 20-85 years). Our data indicating 3.1% (53/1670) isolation rate of MTC from TB-suspected patients in our region were in concordance with the other results reported from Turkey. In conclusion, immunochromatographic TB Ag MPT64 test which seemed to be useful for the rapid identification of mycobacteria grown on solid and/or liquid, was practical to perform and had high sensitivity, however further larger-scaled studies are needed to support our data in our country.
    Mikrobiyoloji bülteni 04/2011; 45(2):266-73. · 0.61 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The aim of this study was to investigate the effects of methionine and dithioerythritol, added to the Tris extender, on ram sperm motility and LPO (lipid peroxidation) and antioxidant capacities during liquid storage up to 72 h at 5°C. Ejaculates collected from five Merino rams, were evaluated and pooled at 37°C. This study included two experiments. In experiment 1, each pooled ejaculate was divided into four equal aliquots and diluted (37°C) with the base extender, containing 0 (control), 1, 2 and 4 mM methionine, at a final concentration of approximately 4×10(8)sperms/ml (single step dilution), in a 15-ml plastic centrifuge tube. In experiment 2, dithioerythritol, at concentrations of 0 (control), 0.5, 1 and 2 mM, was used as an additive in the extender, and the procedure explained above was applied for the division of aliquots and the dilution of semen. Diluted semen samples were kept in glass tubes and cooled from 37 to 5°C in a cold cabinet, and maintained at 5°C. Sperm motility and LPO and total glutathione (GSH) and glutathione peroxidase (GPx) capacities were determined at 5°C for periods of 0, 24, 48 and 72 h of liquid storage. The extender supplemented with 1 mM methionine led to higher motility percentages (77.0±1.2%), in comparison to the control group (66.0±4.9%), during 72 h of liquid storage (P<0.05). As regards dithioerythritol, it did not statistically improve the motility rates for any of the storage times at 5°C. In biochemical assays, differences in LPO levels between the groups with antioxidants and the control groups were not statistically significant. Compared to the control group, no significant difference was observed in GSH and GPx activities following the addition of methionine, during 72 h of storage. Total GSH and GPx activities did not increase significantly upon supplementation with 0.5 and 1 mM of dithioerythritol, compared to the control group, at any of the time points (P>0.05). Dithioerythritol at 2 mM led (P<0.01) to elevating GSH activity, compared to the control group, during 72 h of liquid storage. GPx activity was approximately 10 times higher for 2 mM of dithioerythritol (P<0.001), compared to that of the control group at all time points. The question regarding the sustainability of sperm survival, LPO and antioxidant capacities following liquid storage of semen remains unanswered. Further studies are required for a better understanding of the biochemical changes and to obtain more information on the determination of lipid peroxidation and antioxidant capacities during cooled storage of ram semen.
    Research in Veterinary Science 12/2010; 89(3):426-31. · 1.77 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The physical and chemical properties of chufa tubers are given in Table 1. The nuts were found to be rich in oil (21.57%), fiber (22.13%), and protein (8.11%). Previous studied reported 932.8 g/kg dry matter, 245 g/kg crude lipid, 256.8 g/kg starch, 14.3 g/kg ash, 50.5 g/kg protein, 89.1 g/kg crude fibre, and 154.3 g/kg total sugar [3]. The fatty acid composition of chufa tuber was determined by gas chromotography (Table 2). Oleic acid (72.7%) was present in the highest concentration, followed by palmitic (14.8%), linoleic (11.4%), arachidic (0.6%), and linolenic (0.5%) acids. The fatty acid composition of chufa oil comprised 689.2–732.9 g/kg oleic acid, 125.5–141.2 g/kg palmitic acid, and 99.6–154.6 g/kg linoleic acids [3]. The mineral contents of chufa tuber were determined by ICP-AES (Table 3). Chufa tubers were found to be rich in some minerals such as Al (709.1 mg/kg), Ca (739.1 mg/kg), Fe (412.5 mg/kg), K (9821.7 mg/kg), Mg (1190.5 mg/kg), Na (2407.4 mg/kg), and P (3012.6 mg/kg). Caglarirmak reported 280–380 mg/100 g P, 230–340 mg/100 g K, 81–99 mg/100 g Mg, and 67–105.5 mg/100 g Ca in fresh walnut kernels [10]. This work attempts to contribute to knowledge of the nutritional properties of these tubers. The physical-chemical properties and fatty acid composition were analyzed according to AOAC [11]. The methyl esters of the fatty acids (1 L) were analyzed in a gas chromotograph (Shimadzu GC-2010) equipped with a flame ionization detector (FID) and a fused silica capillary column (60 m 0.25 mm i.d.; film thickness 0.20 m).
    Chemistry of Natural Compounds 01/2010; 46(2):276-277. · 0.60 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This study was conducted to determine the effects of cysteamine, hypotaurine and aminoacids solution (BME) on standard semen parameters, lipid peroxidation and antioxidant activities of Angora goat semen after the freeze-thawing process. Ejaculates collected from four Angora goats were evaluated and pooled at 37 degrees C. Semen samples, which were diluted with a Tris-based extender containing the antioxidants hypotaurine (5 mM) and cysteamine (5 mM), and an aminoacid solution (13%), and an extender containing no antioxidants (control), were cooled to 5 degrees C and frozen in 0.25-ml French straws in liquid nitrogen. Frozen straws were thawed individually at 37 degrees C for 20s in a water bath for evaluation. Supplementation with cysteamine, hypotaurine and BME caused significant (P<0.05) increases in sperm motility, and significant (P<0.05) decreases in total abnormality rates in comparison to the control group. While all in vitro treatments did not affect the acrosomal abnormality rates, hypotaurine and BME but not cysteamine significantly (P<0.05) increased the HOST results as compared to the control group. Supplementation with antioxidants and BME did not significantly affect MDA levels and CAT activity in comparison to the control group (P>0.05). The antioxidants hypotaurine and cysteamine decreased SOD activity when compared to the BME group and controls (P<0.001).
    Research in Veterinary Science 06/2009; 87(3):468-72. · 1.77 Impact Factor

Publication Stats

25 Citations
4.76 Total Impact Points

Institutions

  • 2009
    • Livestock Central Research Institute
      Engüri, Ankara, Turkey
    • Selcuk University
      • Division of Reproduction and Artificial Insemination
      Conia, Konya, Turkey