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Öğe Anti-infective effect of Aquilaria malaccensis L. essential oil against Candida strains, the leading cause of yeast infectious(2025) Kıran, Tugba Raıka; Unver, Tuba; Erenler, SebnemAquilaria malaccensis L., known as Agarwood, is widely found in India, Malaysia, Bhutan, and Indonesia. It is a pleasantly scented plant used in the production of resin. It is an interesting material in the field of health due to its resin and essential oil, which exhibit antimicrobial properties. This study aimed to evaluate the antifungal properties of A. malaccensis L. essential oil and determine its minimum inhibitory concentrations (MIC) against the Candida species tested. The inhibitory effect of A. malaccensis L. essential oil was tested on five Candida species. The broth microdilution method was used to determine the MIC values against the tested microorganisms, and the viability of microorganisms exposed to the plant essential oil was assessed using resazurin sodium salt. According to the results, the MIC of the plant essential oil against Candida tropicalis, Candida krusei and Candida albicans is 62.50 µL/mL. While the MIC against Candida glabrata is 31.25 µL/mL, the MIC against Candida parapsilosis is 7.81 µL/mL. These results show the potential of A. malaccensis L. as an anti-candidal agent. The continuation of this study revealed the need for optimizing and implementing more comprehensive antimicrobial tests.Öğe Cloning, isolation and expression of L-asparaginase gene (ansB) in different gram-negative bacteria expressing Vitreoscilla hemoglobin(Elsevier Sci Ltd, 2011) Erenler, Sebnem; Geckil, Hikmet[Abstract Not Available]Öğe EFFECTS OF SODIUM OCTANOATE, ACYLATED GHRELIN, AND DESACYLATED GHRELIN ON THE GROWTH OF GENETICALLY ENGINEERED ESCHERICHIA COLI(Versita, 2011) Aydin, Suleyman; Erenler, Sebnem; Kendir, YalcinAcylated ghrelin is a 28-amino acid peptide hormone bearing a fatty acid group based on octanoic acid (caprylic acid) at the serine which is located at position 3 and at the N-terminus. If this fatty acid is cleaved from acylated ghrelin, the remaining peptide is referred to as desacylated ghrelin. Free fatty acids (FFAs) can kill or inhibit the growth of bacteria. The purpose of this study was to test this ability using acylated ghrelin, desacylated ghrelin, and sodium octanoate (caprylic acid) as carbon sources for the genetically engineered Escherichia coli strains MK79 and MK57. For this experimental work, minimal medium was modified by replacing glucose with equal concentrations of acylated ghrelin, desacylated ghrelin, or sodium octanoate. Bacterial optical density, viability, alpha-amylase production, plasmid stability and pH of the growth medium were measured during these experiments. The media that allo wed most growth, based on viable cell counts and the OD600 of MK79, was minimal medium, followed by the medium containing desacylated ghrelin or acylated ghrelin, and finally the medium containing sodium octanoate. The same order was observed for MK57. Neither of the strains lost plasmids during the entire course of each experiment. There was also little change in the pH of any of the media used for both strains. These results suggest that sodium octanoate, acylated ghrelin, and desacylated ghrelin, when compared with minimal medium, inhibit Escherichia coli growth. Proliferation was lowest when sodium octanoate was used as the carbon source, followed by acylated ghrelin and desacylated ghrelin. Therefore, the acylated ghrelin found previously in human saliva might help to inhibit pathogenic micro organisms, and acylated ghrelin levels below a critical concentration in saliva could result in an increased risk of oral infection.Öğe Exploring Irisin and Nesfatin-1 in second trimester amniotic fluid: a comparative study of obese and normal weight pregnant women(2024) Kıran, Tugba Raıka; Melekoglu, Rauf; Erenler, Sebnem; İnceoğlu, FeyzaObjective: Obesity is characterized by dysregulated adipokine production patterns, leading to low-grade inflammation. Irisin has been identified as a potential target for the treatment of diabetes and obesity. Nesfatin-1, another adipokine, plays a significant role in various metabolic processes, including glucose homeostasis. This study investigated the levels of the new generation adipokines, irisin and nesfatin-1, in the amniotic fluid during the second trimester of normal and obese pregnancies. Methods: Amniotic fluid samples were collected following established protocols. The first 2 mL portion of fluid obtained during amniocentesis was retained aAfter centrifugation at 1500 g for 10 minutes, the cell-free amniotic fluid was transferred to Eppendorf tubes and quantitative measurements of irisin and nesfatin-1 levels were performed using the Enzyme-Linked Immuno Sorbent Assay (ELISA) method. Results: Our results demonstrate, for the first time in the literature, the presence of irisin and nesfatin-1 in amniotic fluid. Additionally, we found that the levels of these adipokines were significantly lower in obese pregnant women compared to the control group (both p<0.05). Conclusion: Our results demonstrate, for the first time in the literature, the presence of irisin and nesfatin-1 in amniotic fluid. Additionally, we found that the levels of these adipokines were significantly lower in obese pregnant women compared to the control group (both p<0.05).Öğe Oxidative Stress and Anti-Carbonic Anhydrase Antibody Levels in Early Preeclampsia: A Clinical Investigation(2024) Kıran, Tugba Raıka; Melekoglu, Rauf; Erenler, Sebnem; İnceoğlu, FeyzaAim: Preeclampsia (PE) is a dangerous condition that affects 3–5% of pregnancies and has a substantial risk of death and morbidity for both mothers and newborns. The processes behind the etiology of PE are not entirely known, despite the fact that it is the primary cause of illness and death among mothers globally. In order to further understand the correlations between these parameters, this study will look at the levels and presence of anti-carbonicanhydrase (CA) I and II antibodies, total oxidant capacity (TOC), total antioxidant capacity (T-AOC), and malondialdehyde (MDA) in early PE. Material and Method: The research analyzed 30 pregnant women with early PE and 30 normal pregnant women as the control group. Serum levels of anti-CAI (pg/mL), anti-CAII (ng/mL), MDA (nmol/mL), TOS (U/mL), T-AOC (U/mL) were measured and compared between the two groups. Results: Significant variations were noted in the amount of anti-CA I, anti-CA II, MDA, TOS, and T-AOC (both p<0.05) between the control group and the early PE group. More specifically, oxidative stress indicators were changed and increased levels of anti-CA I and anti-CA II were seen in the early PE group in comparison with the control group. Conclusion: The findings show that elevated amounts of anti-CAI and anti-CAII antibodies may serve as predictive markers for early PE. The significant differences in oxidative stress parameters further support the oxidative stress involvement in the pathogenesis of early PE. However, more extensive Research is required to validate these results and clarify the mechanisms underlying PE.
