Sağlık Hizmetleri Meslek Yüksekokulu Koleksiyonu

Bu koleksiyon için kalıcı URI

https://hdl.handle.net/20.500.12428/3539

Listeleniyor 1 - 20 / 41

Hydroxylated-graphitic carbon nitride@graphene oxide composites for sensitive electrochemical determination of COVID-19 drug molnupiravir: Effect of modifier composition
(Elsevier, 2025) Emre, Deniz; Yılmaz, Selehattin; Bilici, Ali
In this research, pencil graphite electrode (PGE) surfaces were modified with a two-dimensional and multifunctional composite material consisting of hydroxylated graphitic carbon nitride (hCN) and graphene oxide (GO) components for sensitive voltammetric determination of coronavirus disease (COVID-19) drug molnupiravir (MLP). The synthesis of carbon nitride, hCN, GO, and the composite material (hCN@GO) included thermal polymerization, hydroxylation, intermediate Hummer's method, and sonochemical processes, respectively. Then, the resulting composite material was electrochemically loaded on the PGE surface. The effects of various experimental parameters, such as the supporting electrolyte, pH, buffer concentration, and scan speed, on the analytical signal were investigated. The most vital one was the composite composition loaded on the PGE. The highest signal was obtained when the PGE surface was coated with the hCN:GO ratio of 30:70 (as weight%). The findings assigned electrode modification with proper composition led to an approximately 17-fold increase in the electrochemically active surface area and a 100-fold decrease in the charge transfer resistance of bare PGE. Thus, it could achieve approximately a 3-fold lower detection limit. The sensor exhibited a linear response in the 7-300 nM MLP concentration range with a detection limit of 2.2 nM without significant interference.
Evaluation of antioxidant activity, anti-lipid peroxidation effect and elemental impurity risk of some wild Agaricus species mushrooms
(Bmc, 2025) Okumuş, Emine; Canbolat, Fadime; Acar, İsmail
BackgroundMushrooms are natural antioxidant sources that have been consumed as food from past to present and have a nutraceutical effect thanks to the bioactive components they contain. The aim of this study is to comparatively evaluate the antioxidant activity, total phenolic content (TPC) and lipid peroxidation (LPO) inhibition effect of three mushroom species (A. bernardii, A. bresadolanus and A. cupreobrunneus) belonging to the Agaricus genus and to perform the carcinogenic and noncarcinogenic risk assessment of toxic elements such as cadmium (Cd), lead (Pb), arsenic (As) and mercury (Hg) in mushrooms.ResultsThe highest antioxidant activity (12.85 mg/mL), TPC (993.04 mg GAE/100 g), and LPO inhibition effect (2.50 mg/mL) were detected in A. bresadolanus mushroom. The lowest content of bioactive compounds was measured in A. cupreobrunneus mushroom. The range of Cd, Pb, As, and Hg levels detected in the three mushroom species were 1775.54-7521.61 mu g/kg, 1176.87-2377.37 mu g/kg, 15201.26-3092.53 mu g/kg and 147.86-576.53 mu g/kg, respectively. The THQ value of As in A. bresadolanus was found to be higher than 1. The HI values of A. bernardii, A. cupreobrunneus and A. bresadolanu were 1.29, 0.98 and 5.57, respectively. The CR values of Cd, As, and Hg were found to be around 10- 4 in A. bernardii, A. cupreobrunneus, and A. bresadolanus. Meanwhile, the CR levels of Pb were found to be around 10- 6 in the three mushrooms. The HI value for non-carcinogenic risk assessment was higher than 1, and the CR for carcinogenic effect was around 10- 4, indicating that consumption of these mushrooms poses a risk to human health.ConclusionsIt is thought that the elemental impurity levels in the analysed edible mushroom species were found to be at a risk potential level, and despite their antioxidant properties, uncontrolled consumption of wild edible mushrooms may cause serious risks. In order to minimize these risks, metal risk assessment studies should be continued in addition to the antioxidant effects and health-beneficial properties of mushrooms.
Toxicity Evaluation of Statin Group Drugs Using in Silico Methods
(Sakarya University, 2024) Berber, Ahmet Ali; Öztürk, Sinem; Ömeroğlu, Murat
Cardiovascular diseases (CVDs) remain a leading cause of mortality in modern society, with factors such as sedentary lifestyles, unhealthy diets, and obesity contributing to their increasing prevalence. The widespread use of Statins for lipidlowering therapy in both primary and secondary cardiovascular prevention is anticipated to rise in response to this trend. Given the rapid escalation in the prevalence of Statin usage, it is imperative to understand their toxicological effects on public health. While previous studies have explored various pharmacological effects of statins, comprehensive investigations into their genotoxic and Mutagenic potential are lacking. In this study, we conducted a comprehensive In silico evaluation of Statins using four different toxicological assessment programs, focusing on various genotoxicity, carcinogenicity, Mutagenicity, and Micronucleus formation endpoints. By comparing program outputs with experimental data, we assessed the reliability of In silico Toxicity predictions and discussed the consistency among different platforms. Our findings suggest discrepancies among the predictions of different programs, highlighting the importance of integrating multiple sources of data and methodologies in Toxicity evaluations. Despite inconsistencies, integrating in silico predictions with future in vitro and in vivo studies can contribute to a better understanding of the toxicological properties of statins and ensure their safe usage. This study underscores the necessity of careful evaluation and utilization of multiple data sources in decision-making regarding the toxicological profile of statins. Ultimately, leveraging in silico methods to guide future comprehensive toxicological studies will enhance our understanding of Statins' safety profiles and contribute to public health research. © 2024, Sakarya University Journal of Science. All rights reserved.
Corrigendum to “Spatial distribution and isotopic signatures of N and C in mosses across Europe” [Sci. Total Environ. 958 (2025) 178043](S0048969724082007)(10.1016/j.scitotenv.2024.178043)
(Elsevier B.V., 2025) Izquieta-Rojano, Sheila; Morera-Gómez, Yasser; Elustondo, David; Lasheras, Esther; Santamaría, Carolina; Torrens-Baile, Julen; Alber, Renate; Coşkun, Mahmut; Coşkun, Münevver
The authors regret that the printed version of the above article contained two errors in the author list. The correct and final version of the author list and their corresponding affiliations follows. The added authors are Winfried Schröder and Harald G. Zechmeister. These individuals provided both samples and data from previously analyzed samples, and contributed to the initial manuscript draft. The authors would like to sincerely apologize for any inconvenience caused and greatly appreciate the understanding of the two authors mistakenly included and the two authors initially omitted. Sheila Izquieta-Rojanoa, Yasser Morera-Gómeza, David Elustondoa, Esther Lasherasa, Carolina Santamaríaa, Julen Torrens-Bailea, Renate Alberb, Lambe Barandovskic, Mahmut Coşkund, Munevver Coskune, Helena Danielssonf, Ludwig De Temmermang, Harry Harmensh, Zvonka Jerani, Sébastien Leblondj, Javier Martínez-Abaigark, Encarnación Núñez-Oliverak, Winfried Schröderl, Gunilla Pihl Karlssonf, Juha Piispanenm, Harald G. Zechmeistern, Zdravko Spirico, Trajče Stafilovc, Lotti Thönip, Jesús Miguel Santamaríaa aUniversidad de Navarra, Instituto de Biodiversidad y Medioambiente BIOMA, Irunlarrea 1, 31008 Pamplona, Spain bAgency for Environment and Climate Protection, Biological Laboratory, Unterbergstr. 2, 39055 Leifers, Italy cInstitute of Physics, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University in Skopje, POB 162, 1000 Skopje, Macedonia dCanakkale Onsekiz Mart University, Faculty of Medicine, Turkey eCanakkale Onsekiz Mart University, Vocational Health School, Turkey fIVL - Swedish Environmental Research Institute, Sweden gVeterinary and Agrochemical Research Centre CODA-CERVA, Tervuren, Belgium hUK Centre for Ecology & Hydrology, Environment Centre Wales, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK iJožef Stefan Institute, Ljubljana, Slovenia jPatriNat (OFB, MNHN), 12 Rue Buffon, CP39, 75005 Paris, France kUniversidad de La Rioja, Facultad de Ciencia y Tecnología, Madre de Dios 53, 26006 Logroño, Spain lChair of Landscape Ecology, University of Vechta, P.O.B. 1553, 49364 Vechta, Germany mNatural Resources Institute Finland, Paavo Havaksen tie 3, FI-90570 Oulu, Finland nUniversity of Vienna, Department of Biodiversity and Conservation Biology, Rennweg 14, 1030 Vienna, Austria oGreen Infrastructure Ltd., Borongajska cesta 81c., HR-10000 Zagreb, Croatia pFUB - Research Group for Environmental Monitoring, Alte Jonastrasse 83, 8640 Rapperswil, Switzerland © 2025 The Author(s)
Arginine-functionalized graphene quantum dots@palladium composite modified pencil graphite electrode for electrochemical detection of DNA-mitomycin C interaction
(Elsevier Ltd, 2025) Denizhan, Nuray; Yılmaz, Selehattin; Özkan-Arıksoysal, Dilsat; Emre, Deniz; Bilici, Ali
In the present study, modified pencil graphite electrodes were prepared by synthesizing a novel nanocomposite with palladium and arginine-functionalized graphene quantum dots (Arg@GQDs) for the electrochemical monitoring of anticancer compound mitomycin C (MC) and double-stranded DNA (dsDNA) interaction for the first time. The oxidation responses of both guanine in DNA and the MC drug were measured in the same potential scanning range, and the drug-DNA interaction was determined by the differential pulse voltammetry (DPV) method. To improve the performance of the developed system, experimental parameters such as dsDNA and MC concentration and their interaction times were optimized. The surfaces obtained after the modification were characterized using scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Ultraviolet-Visible Spectroscopy (UV–Vis), Fourier Transform Infrared Spectroscopy (FTIR), X-ray photon spectroscopy (XPS), Thermogravimetric analysis (TGA) cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) methods. The developed nanocomposite-modified electrodes (Arg@GQD@Pd@PGEs) provided higher guanine oxidation signals than PGEs. The limit of detection (LOD) values for dsDNA immobilized on PGE and Arg@GQD@Pd@PGEs were 0.713 pg 50 μL−1 and 0.019 pg 50 μL−1, respectively. © 2025 Elsevier B.V.
Evaluation of DNA damages in congenital hearing loss patients
(Elsevier B.V., 2021) Çağlar, Özge; Çobanoğlu, Hayal; Uslu, Atilla; Çayır, Akın
In the current study, we aimed to compare the level of genetic damages measured as micronucleus (MN), nucleoplasmic bridge (NPB), and nuclear bud formation (NBUD) in congenital hearing loss patients (n = 17) and control group (n = 24). The cytokinesis-blocked micronucleus assay (CBMN) was applied to the blood samples to measure the frequency of the markers in both groups. The frequencies of MN of hearing loss patients were found to be consistently significantly higher than those obtained for the control group (p < 0.0001). Similarly, we found significantly higher frequency of NPB in patients was obtained for the patient group (p < 0.0001). Finally, the frequencies of NBUD in patients is significantly higher than the level measured in the control group (p < 0.0001). Furthermore, the age-adjusted MNL, BNMN, NPB, and NBUD frequencies in the patients were significantly higher than those obtained in the control group. We observed that the frequency of MN in patients was positively correlated with NBUD frequency which may indicate a common mechanism for these biomarkers in the patient group. We found, for the first time, that there were statistically significant higher levels of MN, NPB, and NBUD in sensorineural hearing loss patients. Since the markers we evaluated were linked with crucial diseases, our findings might suggest that sensorineural hearing loss patients are susceptible to several crucial diseases, especially cancer. Furthermore, the results demonstrated the significance of the MN, NPB, and NBUD level and thus provides a potential marker for the diagnosis of congenital hearing loss patients.
Assessment of genetic damage induced by gadolinium-based radiocontrast agents
(Elsevier GmbH, 2022) Çobanoğlu, Hayal
Background: Today, although gadolinium based contrast agents have been frequently used in the field of medicine, there is limited data available whether gadolinium based agents affect the genome. Aim: The present study aimed to investigate the genotoxic and cytotoxic potentials of gadoteric acid and gadoversetamide used as gadolinium-based contrast agents for magnetic resonance (MR) imaging. Material and methods: The cytokinesis-block micronucleus assay was applied to human peripheral blood lymphocytes to assess the genotoxicity measured as micronucleus (MN), nucleoplasmic bridge (NPBs) and nuclear bud (NBUDs) frequencies. Furthermore, cytokinesis-block proliferation index (CBPI) was calculated to determine cytostasis. Lymphocytes were treated with gadoteric acid at concentrations of 1.0, 2.5, 5.0, and 25 mM and with gadoversetamide at concentrations of 0.25, 1.0, 2.5, and 5.0 mM for 48 h. Results: Gadoteric acid did not cause significant increase in MN, NBPs and NBUDs frequencies and CBPI values at any concentration. Gadoversetamide induced significantly increase MN formation at concentration of 2.5 mM, NBP formation at concentrations of 1.0 and 2.5 mM, and NBUD formation at concentrations of 0.25, 1.0 and 2.5 mM. Additionally, gadoversetamide exposure resulted in statistically significant decrease in CBPI values compared to the control at concentrations of 2.5 and 5.0 mM. In addition, CBPI levels in response to concentrations of gadoversetamide was negatively and significantly associated with concentration. Conclusion: These findings show that gadoteric acid does not have genotoxic or cytotoxic potential, while gadoversetamide might have both genotoxic and cytotoxic potential on human peripheral blood lymphocytes. As a comparison, gadoversetamide was found more genotoxic and cytotoxic.
Karagöz istavrit (Trachurus trachurus) balığının hematolojik parametrelerine su sıcaklığı, tuzluluk, mevsim, üreme, cinsiyet, balık büyüklüğü ve yaşın etkisi
(Kafkas Üniv. Veteriner Fak., 2012) Çelik, Ekrem Şanver; Kaya, Hasan; Yılmaz, Sevdan; Çakıcı, Hasan
In order to determine some hematological parameters of horse mackerel, Trachurus trachurus, sampling was conducted between April 2005 and March 2007 at the Dardanelles. Moreover, the effects of season, reproduction, sex, size, age, water temperature, and salinity on the horse mackerel hematologic parameters were investigated. The following annual averages were obtained for the hematological parameters: hematocrit ratio (Hct), females 38.0 +/- 0.32%, males 37.3 +/- 0.36%; hemoglobin level (Hb), females 12.8 +/- 0.13 g/100 mL, males 13.0 +/- 0.16 g/100 mL; erythrocyte (RBC) count, females 1050263.4 +/- 5857.20 mm(3), males 1046081.13 +/- 6319.89 mm(3); leukocyte (WBC) count, females 15797.4 +/- 259.11 mm(3), males 16545.0 +/- 354.54 mm(3); mean corpuscular volume (MCV), females 363.2 +/- 3.12 mu m(3), males 358.8 +/- 3.57 mu m(3); mean corpuscular hemoglobin (MCH), females 123.0 +/- 1.16 pg, males 124.3 +/- 1.48 pg; mean corpuscular hemoglobin concentration (MCHC), females 33.7 +/- 0.17 g/100 mL, males 34.8 +/- 0.22 g/100 mL. Hematological parameters differed significantly (P<0.05) between reproduction periods and between seasons. For both, male and female horse mackerel, the Hct, Hb, RBC, WBC, MCV, and MCH values increased significantly (P<0.05) with size and age. The WBC increased significantly (P<0.05) with increasing sea water temperature in both sexes. In this study, the reference values of hematological parameters were obtained and it was concluded that these parameters were affected by physiological (fish size, age, reproduction) and environmental (season, temperature) factors. Such factors as well as the reference values should be taken into consideration when hematologic studies for horse mackerel is to be conducted.
Comparison of Normal saline, Activated Charcoal and Intravenous Lipid Emulsion in a Rat Model of Colchicine Overdose: Experimental Study
(Assoc Pharmaceutical Teachers India, 2024) Çelikmen, Mustafa Ferudun; Sarıkaya, Sezgin; Özüçelik, Doğaç Niyazi; Canbolat, Fadime; Sümer, Engin; Keleş, Elif Çiğdem; Maktav Çelikmen, Deniz Sema
Aim: The aim of this study is to investigate the effects of Normal Saline (NS), Activated Charcoal (AC) and Intravenous Lipid Emulsion (ILE) in colchicine poisonings that resulted in death. Study Design: The research is an experimental study carried out in a medical school animal laboratory. Materials and Methods: 24 female Sprague-Dawley rats were divided into 4 equal groups. After giving Colchicine (1 mg/kg, PO) to all animals, different treatments (NS, AC, ILE) were given to 3 groups. Group 4 was not treated. Colchicine blood samples (0.8 mL) were taken from the vena jugularis externa at 4, 8 and 24 hr and evaluated by liquid chromatography. Results: While the blood colchicine level decreased in all groups at 24 hr, the highest decrease was observed in the AC group. Compared to the 4 th hr, blood colchicine levels at 8 hr decreased by 15.49% in the NS group, 64.55% in the AC group and 34.56% in the ILE group. Blood colchicine levels at 24 hr decreased by 66.1% in the NS group, 73.12% in the AC group, 37.73% in the ILE group and 59.17% in the untreated group compared to the 8 th hr. Conclusion: AC administration is very effective in lowering blood colchicine levels. ILE can be used with NS and AC as an early treatment option for colchicine overdoses. However, further studies are needed for more effective methods in the treatment of colchicine overdose.
Salvia officinalis leaf extract-stabilized NiO NPs, ZnO NPs, and NiO@ZnO nanocomposite: Green hydrothermal synthesis, characterization and supercapacitor application
(Springer Heidelberg, 2025) Zenkin, Kübra; Durmuş, Sefa; Emre, Deniz; Bilici, Ali; Yılmaz, Selehattin
In this study, NiO nanoparticles (NiO NPs) and NiO@ZnO nanocomposite were synthesized for the first time using a Salvia officinalis (S. officinalis) extract-assisted hydrothermal process. The S. officinalis leaf extract served as a natural reducing and capping agent. The synthesized NiO NPs, ZnO NPs, and NiO@ZnO nanocomposite were thoroughly characterized using various techniques, including Fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), energy-dispersive spectrometry (EDS) mapping, vibrating sample magnetometer (VSM), and cyclic voltammetry (CV) analysis. The direct and indirect band gap energies of NiO NPs, ZnO NPs, and NiO@ZnO were found to be 3.00, 2.28, and 2.71 eV, and 2.63, 1.91, and 2.23 eV, respectively. The crystallite sizes were analyzed using PXRD spectra through Scherrer and Williamson-Hall (W-H) methods. TEM analysis revealed that the average particle sizes of NiO NPs, ZnO NPs, and NiO@ZnO were 16.0, 207.5, and 31.0 nm, respectively. The magnetic properties of all nanomaterials were assessed via the VSM technique. Specific capacitance (Cs) values, determined from CV voltammograms, were 196.8, 632.4, and 785 Fg-1 at a scan rate of 25 mVs-1 for NiO NPs, ZnO NPs, and NiO@ZnO, respectively. These findings suggest that the green-synthesized NiO@ZnO nanocomposite holds significant potential as a high-performance electrode material for supercapacitor applications.
Genotoxic and cytotoxic effects of polyethylene microplastics on human peripheral blood lymphocytes
(Elsevier Ltd, 2021) Çobanoğlu, Hayal; Belivermiş, Murat; Sıkdokur, Ercan; Kılıç, Önder; Çayır, Akın
Currently, we need emerging initial data regarding how plastic exposures affect cellular and molecular components and how such interactions will be crucial for human health. We aimed to determine the genotoxic and cytotoxic effects of microplastic (MPs,10-45 μm, polyethylene) on human peripheral lymphocytes by using the cytokinesis-block micronucleus cytome (CBMN) assay, which is a comprehensive method to reveal a range of mechanisms, not only diseases but also response to environmental exposures. We measured micronucleation (MN), nucleoplasmic bridge formation (NPB), and nuclear bud formation (NBUD) in human peripheral blood lymphocytes. We also measured the cytokinesis-block proliferation index (CBPI) to calculate cytostasis, which indicates cytotoxicity in lymphocytes treated with five different MPs concentrations for 48 h. Even lower concentrations of MPs increased the level of genomic instability. We found that the in vitro MP exposure significantly increased MN, NPB, and NBUD frequencies. Since we investigated the effect of larger particles relative to the lymphocytes, mechanic interaction of MPs with cells, the release of monomer and additives from MPs could be suggested as possible mechanisms accounting for increasing genomic instabilities. We did not observe a decrease in the cell proliferation index, indicating a lack of MPs’ cytotoxic potential. To the best of our knowledge, our study is the first to identify MPs’ genotoxic potential in human peripheral blood lymphocytes. We suggested further studies to investigate the genotoxic and cytotoxic potential of smaller plastics and the chronic effect of MP on the human population.
Fabrication of PAMP/Au and GO/PAMP/Au nanosensors for electrochemical detection of paracetamol in pharmaceutical preparations
(Springer, 2021) Bilici, Ali; Denizhan, Nuray; Emre, Deniz; Yılmaz, Selehattin; Soylukan, Caner; Algi, Fatih
This paper reports on the modification of Pencil Graphite Electrode (PGE) surface with the poly(2-amino-4-methylphenol)/gold (PAMP/Au) and graphene oxide/poly(2-amino-4-methylphenol)/gold (GO/PAMP/Au) nanocomposites, in two steps. The first step is based on the one-pot preparation of composites by template-free chemical oxidation process. In the second step, composites are deposited at PGE surface by electro-oxidation process. Both nanocomposites and modified PGE surfaces are characterized by X-Ray Diffraction method (XRD), Scanning Electron Microscopy (SEM), EDAX, and CV analyses. The electrochemical performances of modified electrodes (abbreviated as PAMP/Au-PGE and GO/PAMP/Au-PGE) were investigated. The limit of detection values for PGE, PAMP/Au-PGE, and GO/PAMP/Au-PGE were found to be 2.74 × 10–6, 5.29 × 10–7, and 2.91 × 10–8 mol/dm3, respectively. The limit of quantification values were determined as 9.14 × 10–6, 1.76 × 10–6, and 9.69 × 10–8 mol/dm3 for PGE, PAMP/Au-PGE, and GO/PAMP/Au-PGE, respectively.
RNA modifications as emerging therapeutic targets
(John Wiley and Sons Inc, 2021) Çayır, Akın
The field of epitranscriptome, posttranscriptional modifications to RNAs, isstill growing up and has presented substantial evidences for the role of RNAmodifications in diseases. In terms of new drug development, RNA modifica-tions have a great promise for therapy. For example, more than 170 type ofmodifications exist in various types of RNAs. Regulatory genes and their rolesin critical biological process have been identified and they are associated withseveral diseases. Current data, for example, identification of inhibitorstargeting RNA modifications regulatory genes, strongly support the idea thatRNA modifications have potential as emerging therapeutic targets. Therefore,in this review, RNA modifications and regulatory genes were comprehensivelydocumented in terms of drug development by summarizing the findings fromprevious studies. It was discussed how RNA modifications or regulatory genescan be targeted by altering molecular mechanisms.This article is categorized under:RNA in Disease and Development > RNA in DiseaseRNA Interactions with Proteins and Other Molecules > Protein-RNA Inter-actions: Functional ImplicationsRNA Processing > RNA Editing and Modification
Graphene quantum dots-polyfluorene hybrid nanobiosensor for mitomycin C-DNA interaction sensing
(Elsevier Ltd, 2024) Emre, Deniz; Denizhan, Nuray; Özkan-Arıksoysal, Dilsat; Bilici, Ali; Sonkaya, Ömer; Algı, Fatih; Yılmaz, Selehattin
A novel graphene quantum dots (GQD) / polyfluorene (PF) nanocomposite was deposited on the disposable pencil tip graphite electrode (PGE) and proven to be an efficient nanosensor for analysis of the electrochemical interaction between the antitumor compound mitomycin C (MC) with double stranded DNA (ds-DNA). This modified electrode (GQD@PF-PGE) was prepared in four steps: hydrothermal, chemical oxidation, ultrasonication and electro-oxidation processes. GQD, PF, GQD@PF and GQD@PF-PGE have been characterized by different analytical techniques such as SEM, TEM, XRD, FTIR, UV–Vis, EIS. Compared to bare PGE, GQD@PF modified PGE performed approximately 56 times more sensitive analysis when evaluating the guanine oxidation signals measured by DPV. CV and EIS measurements also showed that GQD@PF-PGE possesses a fast electron transfer as compared to bare electrode and exhibit a remarkable electrocatalytic activity towards both guanine and MC electrooxidation. Comprehensive optimization studies have also been carried out for the developed new nanobiosensor.
Adsorption of uranium (VI) from aqueous solutions using boron nitride/polyindole composite adsorbent
(John Wiley and Sons Inc, 2024) Emre, Deniz; Selçuk Zorer, Özlem; Bilici, Ali; Budak, Erhan; Yılmaz, Selehattin; Çalışkan Kılıç, Necla; Gökırmak Söğüt, Eda
Turbostratic boron nitride (tBN) surface is modified with polyindole (PIn) by a facile polymerization technique and the uranyl adsorption efficiency of this mesoporous hybrid is investigated. The successful surface modification is confirmed by FT-IR, Raman, XRD, TEM, SEM, EDX, EDS mapping XPS, BET, and zeta potential techniques. The batch experiments are performed in various temperatures (T), contact times (t), pH, and initial solution concentrations (C0) to evaluate its adsorption performance. The optimum adsorption performance is achieved at pH = 5.0–5.5, T = 307 K, t = 10 min, C0 = 18 mg L−1. These experimental results are evaluated using Freundlich, Redlich–Peterson, and Langmuir isotherm models, which presents equivalent regression coefficients. Maximum adsorption capacity (qm) of the nanoadsorbent (tBN/PIn), determined by the Langmuir isotherm, is 315.29 mg g−1. The adsorption kinetics of uranyl ions on tBN/PIn are in harmony with the pseudo-second order model. tBN/PIn nanoadsorbent provides high adsorption efficiency even at exceptionally low UO22+ concentration range (4–40 mg L−1) and low adsorbent mass (0.005 g). XPS analysis results show that 0.05% of uranium is adsorbed on tBN/PIn via mainly U-O coordination. The results of present study demonstrate that tBN/PIn can a potential adsorbent for removing uranium from aqueous solutions.
Identification of the Candidate mGlu2 Allosteric Modulator THRX-195518 through In Silico Method and Evaluation of Its Neuroprotective Potential against Glutamate-Induced Neurotoxicity in SH-SY5Y Cell Line
(Multidisciplinary Digital Publishing Institute (MDPI), 2024) Canbolat, Fadime; Kantarci-Carsibasi, Nigar; Işık, Sevim; Shamshir, Suhair Rami Mohammed; Girgin, Münteha
Glutamate (Glu) toxicity has been an important research topic in toxicology and neuroscience studies. In vitro and in vivo studies have shown that Group II metabotropic Glu2 (mGlu2) activators have cell viability effects. This study aims to determine a candidate ligand with high mGlu2 allosteric region activity among cytotoxicity-safe molecules using the in silico positioning method and to evaluate its cell viability effect in vitro. We investigated the candidate molecule’s cell viability effect on the SH-SY5Y human neuroblastoma cell line by MTT analysis. In the study, LY 379268 (agonist) and JNJ-46281222 (positive allosteric modulator; PAM) were used as control reference molecules. Drug bank screening yielded THRX-195518 (docking score being −12.4 kcal/mol) as a potential novel drug candidate that has a high docking score and has not been mentioned in the literature so far. The orthosteric agonist LY 379268 exhibited a robust protective effect in our study. Additionally, our findings demonstrate that JNJ-46281222 and THRX-195518, identified as activating the mGlu2 allosteric region through in silico methods, preserve cell viability against Glu toxicity. Therefore, our study not only emphasizes the positive effects of this compound on cell viability against Glu toxicity but also sheds light on the potential of THRX-195518, acting as a mGlu2 PAM, based on in silico absorption, distribution, metabolism, excretion, and toxicity (ADMET) data, as a candidate drug molecule. These findings underscore the potential utility of THRX-195518 against both neurotoxicity and Central Nervous System (CNS) disorders, providing valuable insights.
Occupational exposure to radiation among health workers: Genome integrity and predictors of exposure
(Elsevier B.V., 2024) Çobanoğlu, Hayal; Çayır, Akın
The current study aimed to investigate genomic instabilities in healthcare workers who may experience varying levels of radiation exposure through various radiological procedures. It also sought to determine if factors related to the work environment and dosimeter reading could effectively explain the observed genomic instabilities. Utilizing the cytokinesis-block micronucleus assay (CBMN) on peripheral blood lymphocytes, we assessed a spectrum of genomic aberrations, including nucleoplasmic bridge (NPB), nuclear budding (NBUD), micronucleus (MN) formation, and total DNA damage (TDD). The study uncovered a statistically significant increase in the occurrence of distinct DNA anomalies among radiology workers (with a significance level of P < 0.0001 for all measurements). Notably, parameters such as total working hours, average work duration, and time spent in projection radiography exhibited significant correlations with MN and TDD levels in these workers. The dosimeter readings demonstrated a positive correlation with the frequency of NPB and NBUD, indicating a substantial association between radiation exposure and these two genomic anomalies. Our multivariable models identified the time spent in projection radiography as a promising parameter for explaining the overall genomic instability observed in these professionals. Thus, while dosimeters alone may not fully explain elevated total DNA damage, intrinsic work environment factors hold potential in indicating exposure levels for these individuals, providing a complementary approach to monitoring.
Effect of Boric Acid on Metabolic Peptides and Some Biochemical Parameters in Experimental Diabetic Rats
(Springer, 2024) Çakır, Selcen
Boron (B) is an element that has recently been wondered and researched in many fields, especially due to its effects on energy metabolism. The aim of this study is to evaluate the effect of boric acid (BA) on newly discovered energy metabolism peptides that have not been studied before. In this study, the effects of 15 mg/kg of BA were evaluated in 24 Wistar rats. Groups were named as control group, 15 mg/kg BA group, streptozotocin (STZ)-induced experimental diabetic group, and STZ-induced experimental diabetic + 15 mg/kg BA administered group (STZ+15 mg/kg BA). Serum asprosin, nesfatin-1, preptin, insulin, total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), aspartate transaminase (AST), alanine transaminase (ALT), and glucose analyses were performed. In this study, the increase in glucose, TG, TC, LDL-C levels, and AST, ALT activities in STZ-induced groups were reduced with BA administration. While HDL-C level significantly decreased in the STZ group, the level approached the control group values after BA administration (p<0.001). As for peptides, although there was a statistically significant increase after 15 mg/kg BA administration, these levels did not approach the control group values (p<0.001). According to the findings, STZ-induced diabetes mellitus and the biochemical processes that develop accordingly change correlatively. This study showed that BA is effective in energy metabolism.
Analysis of non-carcinogenic health risk assessment of elemental impurities in vitamin C supplements
(Mashhad University of Medical Sciences, 2023) Canbolat, Fadime
Objective(s): Elemental impurity exposure that may occur in the use of supplements has the potential to pose a risk to human health. Vitamin C supplements are among the most commonly used supplements on a daily basis and in the long-term due to the pharmacological properties of vitamin C. In this study, we aimed to evaluate the non-carcinogenic health risk of elemental impurities that may cause contamination in orally administered vitamin C supplements. Materials and Methods: Ten elemental impurities (Cd, Pb, As, Hg, Co, V, Ni, Cr, Sb, and Sn) in 12 supplements were analyzed using ICP-MS. The estimated daily intake (EDI), hazard quotient (HQ), and hazard index (HI) values of elemental impurities were calculated for non-carcinogenic risk assessment. Cancer risk (CR) was additionally calculated for elemental impurities with carcinogenic properties detected in the samples. Results: Low levels of Cr and Hg were detected in some samples. While the HQ values of sample 1, sample 2, sample 8, and sample 9 for Hg were calculated as 0.054, 0.096, 0.064, and 0.086, respectively, the HQ values of sample 5, sample 10, and sample 11 for Cr were calculated as 0.011, 0.017, and 0.014, respectively. Since only Hg or only Cr was detected in samples with elemental impurity, the HI values in the samples are the same as the HQ values. Since the HQ and HI values calculated from the samples are not≥1, there is no elemental impurity at a level that will hazard human health through supplement use. Other carcinogenic elements were not detected in the samples except Cr. In sample 5, sample 10, and sample 11, the CR values for Cr were 1.767.10-5, 2.571.10-5, and 2.089.10-5, respectively. In probability simulation, while HQ and CR values of Cr did not exceed the allowable value, the HQ level for Hg in the 95% slice was higher than the allowable value. Conclusion: There is no risk to human health and there is no critical difference between the supplements considering the elemental pollutant content among the vitamin C supplements of different trademarks. However, in order to keep the Hg level, which has a potential risk capacity, at low limits, it is recommended that the necessary risk-reducing measures be taken by the authorities and further studies be carried out.
Serum glial-derived neurotrophic factor and nerve growth factor levels in patients with COVID-19
(Czech Medical Association J.E. Purkyne, 2023) Türkeri, Ö. N.; Özgeriş, F. B.; Koçak Ö.F.; Kurt N.; Yüce N.; Bakan N.; Parlak E.
Introduction and objective: The new type of coronavirus (COVID-19) causes high fever, fatigue, cough, respiratory distress, diarrhea, headache in some patients, cerebrovascular diseases, unconsciousness, encephalopathy, encephalitis, peripheral nervous system damage, etc. It is a viral respiratory disease that manifests itself with neurological findings. In our study, glial-derived neurotrophic factor (GDNF) and nerve growth factor (NGF) levels of neurotrophic factors (NF), which ensure the survival, growth, maturation and differentiation of neurons were investigated in COVID-19 patients, including their relationship with the severity of the disease. Materials and methods: Out of a total of 70 participants, 20 participants are in the healthy control group (CG) and 50 participants are in the group of patients with COVID-19 according to PCR test (uncomplicated group [NCG], moderately severe group [MG], severe group [SG]). Serum NGF and GDNF levels in all groups were evaluated spectrophotometrically using ELISA kits. The results were compared both between the patient groups and between the patient and healthy control groups. Results: Serum NGF concentration was significantly higher in the MG group than in the NCG and the SG group (P = 0.042). No statistically significant difference was found in serum GDNF levels in COVID-19 patients and CG. Conclusion: There was no difference in serum NGF and serum GDNF levels in COVID-19 patients compared to the healthy control group.

Güncel Gönderiler