Birol Ozkalp

Selcuk University, Conia, Konya, Turkey

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Publications (6)6.82 Total impact

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    ABSTRACT: In this study, the new Schiff base ligands derived from condensation of amine and 5-bromo-salicylaldehyde were characterized. All compounds, the Schiff bases and the metal complexes, were characterized by elemental analyzes, FT-IR, 1H NMR, 13C NMR and magnetic susceptibility measurements. The synthesized ligands, along with their metal (II) complexes, were screened for their in vitro antibacterial activity against four Gram-negative (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Salmonella enteritidis) and four Gram-positive (Streptococcus pyogones, Bacillus cereus, Staphylococcus aureus and Methicillin-resistant S. aureus) bacterial strains by using disc diffusion and broth microdilution techniques. The minimum inhibitory concentration (MIC) values were calculated by microplate reader at 620 nm to optimum result. It was found that all compounds showed mild to moderate antibacterial activity and the Schiff base ligands had a better antibacterial activity than their complexes.
    Full-text · Article · Sep 2013 · Journal of Molecular Structure
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    ABSTRACT: Abstract Context: Terfezia boudieri Chatin (Pezizaceae), Agaricus brunnescens Peck (Agaricaceae) and Lactarius vellereus (Fr.) Fr. (Russulaceae) are well-known species in Turkey, and are used both for food and traditional medicine. Objective: The powdered fruit bodies of T. boudieri, A. brunnescens and L. vellereus were used to evaluate the antimicrobial activities. Materials and methods: Chloroform, acetone and methanol extracts of T. boudieri, A. brunnescens and L. vellereus were tested for their antimicrobial activities against four Gram-positive bacteria, five Gram-negative bacteria and yeast using a micro-dilution method. Results: The strongest minimum inhibitory concentration (MIC) value observed against the test microorganisms was with the chloroform extract of T. boudieri (MIC 2.4 µg/mL) against Streptococcus pyogenes. Maximum antimicrobial effects were observed with the acetone extracts of T. boudieri and L. vellereus (MIC 4.8 µg/mL) against Bacillus subtilis. The strongest antifungal activity was observed with the acetone extracts of T. boudieri (MIC 2.4 µg/mL) and A. brunnescens (MIC 19.5 µg/mL) against Candida albicans. The strongest MIC values for all fungal extracts were observed between 78 and 2.4 µg/mL. Discussion and conclusion: Present results demonstrated that these three mushroom species have excellent antimicrobial and antifungal activities, and thus have great potential as a source for natural health products.
    Full-text · Article · Jun 2013 · Pharmaceutical Biology
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    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.
    Full-text · Article · Apr 2011 · Mikrobiyoloji bülteni
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    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 × 108 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.
    Full-text · Article · Dec 2010 · Research in Veterinary Science
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    M. M. Ozcan · A. Gumuscu · F. Er · D. Arslan · B. Ozkalp
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    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).
    Full-text · Article · May 2010 · Chemistry of Natural Compounds
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    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).
    Full-text · Article · Jun 2009 · Research in Veterinary Science