Hanifi Körkoca

Synthesis, Characterization of Poly(E)-3-amino-4-((3-bromophenyl)diazenyl)- 1H-pyrazol-5-ol: Investigation of Antibacterial Activity, Fluorescence, and Optical Properties

The oxidative polycondensation reaction conditions of (E)-3-amino-4-((3-bromophenyl)diazenyl)-1H-pyrazol-5-ol (Schiff base monomer) has been accomplished using NaOCl, and air O2 oxidants in an aqueous alkaline medium. The optical conductivity, dielectric and optical properties of synthesized poly(Schiff base) were examined. The magnitude of the refractive index decreases with increasing of photon energy up to about 2.5 eV, then refractive index of the poly(Schiff base) increases with increasing of photon energy. The E0 and Ed values of the poly(Schiff base) were found to be 5.34 and 9.22 eV, respectively. An indirect energy-gap value of the poly(Schiff base) was found to be 0.94±0.009 eV. A direct energy-gap value of the poly(Schiff base) was found to be 1.38±0.01 eV and 1.96±0.009 eV at first region and second region, respectively. Absorption coefficient K changes from 11.87 to 18.25 cm−1. In addition to fluorescence property of poly(Schiff base) was investigated. Finally, poly(Schiff base) and Schiff base monomer were tested for antibacterial activities against some bacteria.

Detection of putative virulence genes in Aeromonas isolates from humans and animals

INTRODUCTION Aeromonas are food- and water-borne bacteria that are considered to be zoonotic human pathogens. This study aimed to investigate the presence of genes associated with virulence in human and animal Aeromonas isolates and the potential role of animal isolates with regards to human Aeromonas infections. METHODOLOGY The presence of aerA, hlyA, alt, ast, laf, ascF-G, stx1 and stx2 putative virulence genes in 40 human and animal Aeromonas isolates (16 human and 24 animal isolates) were examined by polymerase chain reaction (PCR). DNA fragments of expected sizes were purified and sequenced. BLAST in the NCBI was used to verify any amplified products. RESULTS PCR screening showed that hlyA, alt, and laf genes were determined at ratios of 6.25%, 50%, and 6.25%, respectively, in human isolates. The ratios of hlyA, alt, ascF-G, laf, stx2, and stx1 genes in animal isolates were 58.3%, 20.83%, 33.3%, 20.83%, 8.33%, and 4.17%, respectively. Neither aerA nor ast genes were detected in any isolates. Any one of eight putative virulence genes was not detected in seven human and eight animal isolates in the study. CONCLUSIONS The current study is the first to investigate the presence of the virulence gene in gull Aeromonas isolates. The manifestation of the presence of the virulence gene and gene combinations was considerable, especially in fish and gull isolates when compared with clinical human isolates. The current study demonstrates the potential importance of fish and gulls in terms of human Aeromonas infections.

Synthesis, Structural Characterization and Biological Activity of Novel Cyclohexane-1,3-dione Ligands and Their Metal Complexes

Some new Zn(II) and Cu(II) complexes [Cu(L1)(OAc)2]∙H2O, [Cu(L1)(NO3)H2O]∙NO3∙3.5H2O, [Zn(L1)(NO3)2]∙4.5H2O, [Zn(L1)(OAc)2(H2O)2]∙3H2O, [Cu2(L2)(OAc)4]∙2H2O∙2DMF, [Cu(L2)2]∙2NO3∙1.5DMF∙H2O, [Zn(L2)2(NO3)2]∙DMF and [Zn2(L2)(OAc)4(H2O)4]∙5H2O; L1 = 2-[2-(2-methoxyphenyl)hydrazono]cyclohexane-1,3-dione and L2 = 2-[2-(3-nitrophenyl)hydrazono]cyclohexane-1,3-dione were synthesized and characterized by IR, 1H-NMR,13C-NMR and ultraviolet (UV-Vis.) spectroscopy, elemental analysis, magnetic susceptibility, mass spectrometry and thermogravimetry-differential thermal analysis (TGA-DTA). The synthesized ligands and their complexes were tested for antibacterial activity against Escherichia coli ATCC 25922, Enterococcus faecalis ATCC 29212, Staphylococcus aureus ATCC 25923, and Salmonella typhimurium CCM 583. Some of complexes showed medium-level antibacterial activity against the test bacteria compared with ampicillin.

Chemical Composition, Antioxidant, Antimicrobial Activities of the Essential Oil of Salvia hypargeia Fisch. & Mey

Abstract The aim of this study was to investigate the chemical composition, antioxidant and antimicrobial activities of the essential oil of Salvia hypargeia from Turkey. According to the results of GC-EIMS analysis, the major compounds of the oil were determined as Ot-pinene (15.9 %), ß-pinene (22.3 %), pulegone (13.5 %) and ß-ylangene (17.8 %). Essential oil could not show radical scavenging effect in DPPH system. On the other hand, inhibition capacity of the essential oil against linoleic acid oxidation was measured as 21.0 %. In the case of antimicrobial activity, the most sensitive microorganism was B. subtilis which has the lowest MIC value (35.80 µg/ml). This is followed by S. aureus and C. diphteriae (8.45 and 14.20 µg/ml, respectively).

Prevalence of Cryptosporidium spp. in Asymptomatic Food Workers

OBJECTIVE Cryptosporidium spp. is obligatory intracellular parasite and causes intestinal infection. In intestine infections in the form of sporadic and epidemics, food and accordingly workers in food sector may play a role as the source of infection. In this study, it is aimed to reveal the existence of asymptomatic cryptosporidiosis. METHODS In the study, stool samples of 393 workers -employed at various branches of food sector in the region of Van- are used. In order to detect Cryptosporidium spp. oocysts, Modified Ziehl Neelsen (MZN) Staining was used. RESULTS In this study, asymptomatic cryptosporidiosis has been detected in 5 (1.27%) of 393 workers. CONCLUSION Epidemiological findings indicate that food workers can be source of cryptosporidiosis outbreak. Thus, searching for the existence of asymptomatic cryptosporidiosis food workers -which epidemiologically has potential significance- and taking the required measures in case of its determination are significant in respect of public health.

HASTANE KÖKENLİ KLİNİK OLMAYAN Staphylococcus aureus SUŞLARININ ANTİMİKROBİYAL DUYARLILIKLARININ ARAŞTIRILMASI

Methicillin resistant Staphylococcus aureus (MRSA) is one of the most important factors in hospital acquired infections. This study aims at revealing the antimicrobial sensitivity of nonclinical S. aureus isolates with potential significance with respect to hospital acquired infections. To this end, mannitol salt agar was cultured from swab samples obtained from the personnel, patients, patient accompanists in the state hospital of our city and the hospital environment and identification of suspicious isolates that reproduce was carried out through classical methods. Manifestation of the antimicrobial sensitivity thereof, on the other hand, was carried out through the disc diffusion method. In the study, 22 (28,21%) S. aureus were isolated from a total of 78 samples. While oxacillin resistance was detected in six (27.27%) of the strains, inducible clindamycin resistance was found out again in 2 (9.1%; one of the strains is MRSA, the other is MSSA) of the strains. In conclusion, detection of MRSA in the samples studied and, also, of inducible resistance to clindamycin which is one of the treatment alternatives, reveals the necessity to take the required precautions with respect to the prevention of possible infections resulting from these strains

TÜRKİYE’NİN FARKLI BÖLGELERİNDEKİ İKİ İLDE FARKLI SOSYOEKONOMİK DÜZEYE SAHİP ÇOCUKLARDA Enterobius Vermicularis’in DAĞILIMI

In this study, it was aimed to determine the extensity of Enterobius vermicularis by using cellophane bant method in the district of Esenyurt in Istanbul and in the district of Kulp in Diyarbakir. In total, 100 specimens were gathered and in 16% of these specimens Enterobius vermicularis egg was encountered. A questionnaire form researching social economic situation, gender and age of the children from whom the specimens of cellophane band were taken to get information about the factors affecting Enterobius Vermivularis dispersion was prepared. No differences were observed in the dispersion of gender-related Enterobius vermicularis and an increase was observed in prevalence of E. Vermicularis in children of low-income families. A meaningful relation was found with the socio economic level. A significant difference wasn’t observed between age groups in this study in which the children between 5 and 10 were evaluated