39 research outputs found
"Prevalence of Candida albicans in High-Risk Human Papillomavirus-Positive Women: A Study in Diyarbakır Province, Turkey"
No full textE. Oktay Gultekin, T. Mecit, and B. Can, “Prevalence of
Candida albicans in High-Risk Human PapillomavirusPositive Women: A Study in Diyarbakır Province, Turkey,”
Canadian Journal of Infectious Diseases and Medical Microbiology 2023, no. 1 (2023), https://doi.org/10.1155/2023/
9945561.
Te author list incorrectly omitted the author “Tarık
Mecit”.
Te corrected author list should read: Efdal Oktay
Gultekin, Tarık Mecit, and Behzat Can.
Te author contributions statement should read as
follows:
E. Oktay Gultekin planned the study, supplied the
materials, carried out the laboratory work, performed statistical analysis, and wrote the article.
T. Mecit: Project administration, visualization, and
writing–review & editing.
B. Can collected the sample, collected the participant
data, analyzed the data, collected and processed the data, and
critically reviewed the article.
We apologize for this error. Te author list and contributions statement in the original article has since been
updated accordingly
Investigation of a Testing Method for Compression Behavior of Spacer Fabrics Designed for Concrete Applications
No full textSpacer fabrics are state-of-the-art structures and have attracted more attention in recent years. They have already been used in many areas and present different advantages especially for technical applications. Recently, special spacer fabrics have been designed in order to improve the characteristics of concrete which is used, in particular, for structural reinforcement of buildings. These spacer fabrics have different characteristics compared to conventional textiles due to their special structure. Therefore, characterization of these structures with existing methods is not possible. Compression resistance of spacer fabrics provided by spacer yarns in the structure is one of their main characteristics. However, compression behavior of spacer fabrics has not been investigated in detail to date. In this work, a testing method for the characterization of spacer fabrics used in concrete applications on the basis of their compression behavior has been investigated and defined.TUBITAK Textile Research CentreTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK); Ege University Textile Engineering Department, Izmir, TurkeyEge UniversityThe authors give special thanks to Institut fur Textiltechnik der RWTH Aachen, Germany for the opportunity to conduct this work, and TUBITAK Textile Research Centre and Ege University Textile Engineering Department, Izmir, Turkey for supporting the author Diren Mecit Armakan
A lime production of the fluidized bed boiler's energy and exergy analyse
No full textWOS: 000407802800006In this study, it was calculated energy and exergy analysis of a lime production for the fluidized bed boiler by a case of sugar factory. The aim of this study is to show calculation of the energy and exergy analysis of a lime production for the fluidized bed boiler, and to determine a lime mass quantity for the factory process. This factory is a sugar factory that has got many heat processes for the sugar raw filtration and defection. The production of lime mass was found 1.2973 [kg/s]. The production of lime (CaO) energy result was found 4121.92 [kW] and exergy result was found 2766.97 [kW]. Energy (CaO) quality was found 0.671.Doctorate Thesis; Gazi University Graduate School of Natural and Applied Sciences, Mechanical Engineering [2013/04072148]This study was presented in International Conference on Energy Systems Istanbul 2015. This study was also supported by a Doctorate Thesis (Date of study: February 2009 to January 2013) for the case of a sugar factory in Turkey. This Doctorate Thesis was carried out by the Gazi University Graduate School of Natural and Applied Sciences, Mechanical Engineering (PhD study, Process 2013/04072148). The Doctorate (PhD) Thesis Supervisor was Professor Mecit Sivrioglu, who is also an author in this manuscript. The integrated sugar factory's name is Cumra Sugar Integrated Plant. The process data were taken with permission from the factory manager. These data were recently taken in collaboration with the Department of Factory Central Monitoring and Directorate of Maintenance and Energy
UNDERSTANDING TEMPERATURE-DEPENDENT CAKING MECHANISMS IN POWDERED DAIRY PRODUCTS USING TD-NMR RELAXOMETRY
No full textUNDERSTANDING TEMPERATURE-DEPENDENT CAKING MECHANISMS INPOWDERED DAIRY PRODUCTS USING TD-NMR RELAXOMETRYOzan Tas(1), Esmanur Ilhan(1), Melis Cetin Karasu(1), Selen Guner San(1), Mecit Halil Oztop*(1)1) Department of Food Engineering, Middle East Technical University, Turkey*Corresponding author - E-mail: [email protected] is a common issue in many industries, especially during the production, storage, andtransportation of powder products. Caked powders lead to higher costs, longer production times,and lower product quality. Temperature plays a vital role in caking, where lower temperaturesincrease the tendency, especially in fat-rich powders. Fat can melt as the temperature increases andform liquid bridges between particles, which solidify when the temperature drops, leading to caking.While many studies have explored caking using mathematical and experimental methods, theseapproaches often struggle to predict molecular changes and surface properties to understandcaking. Time Domain Nuclear Magnetic Resonance (TD-NMR) relaxometry can be useful for studyingthe caking behavior at the molecular level, as it provides detailed insights into the internal structureand behavior of powders, offering a fast, non-destructive, and reliable approach. This studyexamined the effect of temperature on the caking of two demineralized whey powders (WPC) andthree whole milk powders, known for their high caking tendency. The samples that had a moisturecontent of 3-4% were analyzed using TD-NMR at 4°C, 25°C, 35°C, and 60°C. T1 and T2 relaxationtimes were measured, and relative crystallinity and solid content values were calculated. The resultsshowed that as temperature increased from 4°C to 60°C, solid content decreased, especially inwhole milk powders, likely due to fat melting. T2 times became longer, indicating that highertemperatures make fats more mobile and the matrix less rigid. T1 relaxation times, characterized byshort and long components, showed that with increasing temperature, the T1 of the long componentincreased while the short component decreased, indicating stronger intramolecular interactions atlower temperatures. These findings suggest that powders are more prone to caking at lowertemperatures due to the solidification of fats. This study demonstrates that TD-NMR relaxometry isan effective tool for investigating caking behavior, providing valuable insights into how temperatureand fat content influence the caking process in powdered samples.Keywords: caking, temperature influence, TD-NMR relaxometry, whey powders, whole milk powdersAcknowledgement: This project was funded by The Scientific and Technological Research Council ofTurkey (TUBITAK) with grant # 123O032 funded under the 1001 program.</p
UNDERSTANDING TEMPERATURE-DEPENDENT CAKING MECHANISMS IN POWDERED DAIRY PRODUCTS USING TD-NMR RELAXOMETRY
No full textUNDERSTANDING TEMPERATURE-DEPENDENT CAKING MECHANISMS IN
POWDERED DAIRY PRODUCTS USING TD-NMR RELAXOMETRY
Ozan Tas(1), Esmanur Ilhan(1), Melis Cetin Karasu(1), Selen Guner San(1), Mecit Halil Oztop*(1)
1) Department of Food Engineering, Middle East Technical University, Turkey
*Corresponding author - E-mail: [email protected]
Caking is a common issue in many industries, especially during the production, storage, and
transportation of powder products. Caked powders lead to higher costs, longer production times,
and lower product quality. Temperature plays a vital role in caking, where lower temperatures
increase the tendency, especially in fat-rich powders. Fat can melt as the temperature increases and
form liquid bridges between particles, which solidify when the temperature drops, leading to caking.
While many studies have explored caking using mathematical and experimental methods, these
approaches often struggle to predict molecular changes and surface properties to understand
caking. Time Domain Nuclear Magnetic Resonance (TD-NMR) relaxometry can be useful for studying
the caking behavior at the molecular level, as it provides detailed insights into the internal structure
and behavior of powders, offering a fast, non-destructive, and reliable approach. This study
examined the effect of temperature on the caking of two demineralized whey powders (WPC) and
three whole milk powders, known for their high caking tendency. The samples that had a moisture
content of 3-4% were analyzed using TD-NMR at 4°C, 25°C, 35°C, and 60°C. T1 and T2 relaxation
times were measured, and relative crystallinity and solid content values were calculated. The results
showed that as temperature increased from 4°C to 60°C, solid content decreased, especially in
whole milk powders, likely due to fat melting. T2 times became longer, indicating that higher
temperatures make fats more mobile and the matrix less rigid. T1 relaxation times, characterized by
short and long components, showed that with increasing temperature, the T1 of the long component
increased while the short component decreased, indicating stronger intramolecular interactions at
lower temperatures. These findings suggest that powders are more prone to caking at lower
temperatures due to the solidification of fats. This study demonstrates that TD-NMR relaxometry is
an effective tool for investigating caking behavior, providing valuable insights into how temperature
and fat content influence the caking process in powdered samples.
Keywords: caking, temperature influence, TD-NMR relaxometry, whey powders, whole milk powders
Acknowledgement: This project was funded by The Scientific and Technological Research Council of
Turkey (TUBITAK) with grant # 123O032 funded under the 1001 program
Impact of High-fructose Diet and Metformin on Histomorphological and Molecular Parameters of Reproductive Organs and Vaginal Microbiota of Female Rat
No full textThere are limited data on the effects of a high-fructose diet on the female reproductive system. Although metformin has some functional effects on female fertility, its reproductive outcome on high fructose diet-induced metabolic syndrome is unclear. The aim of the present study is to evaluate the impact of a high fructose diet on histomorphological and molecular parameters of the reproductive organs and vaginal microbiota as well as the treatment potential of metformin. Wistar albino rats were used in the study. The metabolic syndrome model was induced by a high-fructose diet in rats for 15 weeks. Metformin was orally administered once a day for the last 6 weeks. The high-fructose diet increased blood glucose, triglycerides, insulin, and ovarian testosterone levels; however, it reduced ovarian aromatase levels and follicle numbers and caused uterine inflammation. The high-fructose diet-induced molecular abnormalities on ovarian tissue were demonstrated by the downregulation of ovarian insulin signaling pathway proteins and dysregulation of ovarian mitogenic and apoptotic pathway proteins. A high-fructose diet caused vaginal dysbiosis, metformin increased probiotic bacteria in the vaginal microbiota. Our results revealed that metformin improves ovarian impairments by modulating hormonal balance, insulin level, mapk, and apoptotic signaling molecules, as well as regulating the vaginal microbiota. © 2024. The Author(s)
Prediction of Friction and Wear Behavior of Ternary Polycarbonate-Poly(Butylene Terephthalate)/Multiwalled Carbon Nanotubes Polymer Nanocomposites Using Feature Engineering Assisted Machine Learning Algorithms
No full textIn the present work, polycarbonate-poly(butylene terephthalate)/multiwalled carbon nanotubes (PC-PBT/MWCNT) nanocomposites were produced via melt-compounding, extrusion, and molding techniques with nanofiller wt. fractions of 0, 1, 3, 5, and 7 wt %. Nanofiller induced microstructural, mechanical and dry sliding wear property changes were evaluated, and coefficients of friction (COF) and specific wear rate (SWR) responses were predicted by employing machine learning (ML) models with and without feature engineering (FE) integration. One wt % nanofiller addition resulted in 52%, 41%, and 119% increase in tensile modulus, flexural modulus, and impact strength of neat samples, respectively. Nanofiller addition also resulted in up to 52% and 41% enhancement in tensile and flexural moduli, and up to 91% and 22% reduction in SWR and COF values. The lowest COF and SWR were recorded as 0.231 for 1 wt % MWCNT under 10 N and 4.48 (x10-15) m3/Nm for 0.5 wt % MWCNT under 5 N, respectively. Wear data and worn surface analysis results indicate that COF is directly affected by a transfer-film-formation mechanism at the contact interface, whereas SWR is sensitive to a variety of other factors including contact mechanics features. FE-assisted K-Star model demonstrated the highest prediction accuracy (R 2 = 0.96), whereas the highest accuracy without FE was achieved by Lasso model (R 2 = 0.87). The improved accuracy of FE-assisted models is ascribed to their higher robustness against inconsistencies in the data sets.T?rkiye Bilimsel ve Teknolojik Arastirma Kurumu [TUBITAK 1002-A, 123M666, TUBITAK]This research was supported by the TUBITAK 1002-A project (grant no. 123M666). The author gratefully acknowledges the financial support provided by TUBITAK
Tribological response of pack-boronized inconel 601 superalloy surfaces at elevated temperatures
No full textInconel 601 superalloy sample surfaces were pack-borided at 1000 degrees C for 4 h and 6 h to investigate the effect of boriding treatment on the mechanical and high temperature wear performance. The boride layers were characterized using SEM, EDS, XRD, microhardness tests, nanoindentation and high-temperature wear tests at room temperature and 500 degrees C under 7 N and 15 N normal loads. Boriding led to nearly 300 % increase in the hardness and up to 11-fold increase in the wear performance of the Inconel 601 surfaces. Despite lower COF and specific wear rates, borided surfaces were more susceptible to temperature increase than the non-treated Inconel 601 surfaces due to the lower tendency of wear debris with hard phase content to form a consistent lubricating layer
Additions to rust and chytrid pathogens of Turkey
No full textWOS: 000357283100003Uromyces bornmuelleri on Bongardia chrysogonum and Physoderma maculare on Alisma plantago-aquatica have been recently discovered in Turkey. Morphological data obtained by light and scanning electron microscopy of identified fungi are presented.DUBAP (Dicle University)Dicle University [DUBAP 12ZF71]The author thanks Prof. Dr. Z.M. Azbukina (Vladivostok, Russia) and Dr. Yuri Tykhonenko (Kiev, Ukraine) for critically reading the manuscript and serving as presubmission reviewers. Especially we are grateful to Dr. Shaun Pennycook (Auckland, New Zealand) for detailed linguistic help and nomenclatural review of the manuscript. We would like thank DUBAP (Dicle University Research Projects Coordinator) for financial support of this Project (DUBAP 12ZF71). We also thank Prof. Dr. Mecit Vural (Gazi University, Ankara) and Prof. Dr. A. Selcuk Ertekin (Dicle University, Diyarbakir) for his help with the identification of the hosts
FT-IR, Laser-Raman, UV-Vis, and NMR Spectroscopic Studies of Antidiabetic Molecule Nateglinide
No full textThe quantum chemical calculations and spectroscopic and theoretical characterizations of nateglinide molecule, a derivative of meglitinide and an oral antidiabetic drug, were performed using FT-IR, Laser-Raman, and NMR chemical shift and UV-Vis analysis methods. The other parameters including geometric structures, optimized geometry, vibrational frequencies, dipole moments, infrared and Raman intensities, and HOMO and LUMO energies of nateglinide molecules were studied using the density functional theory. In addition, the C-13 and H-1 NMRs were calculated using Gaussian 09 program with the DFT/B3LYP method at the 6-31G + (d, p) basis set. TD-DFT calculations were performed to examine the electronic transitions including orbital energies, absorption wavelengths, oscillator strengths, and excitation energies in methanol. The research was performed to provide detailed spectroscopic information of antidiabetic nateglinide molecule's monomer conformations.Bartin University Research Fund Project [2017-FEN-A-005]This work was supported by Bartin University Research Fund Project under the Project no. 2017-FEN-A-005. The author thanks Cankiri Karatekin University Research Center for NMR, FT-IR, and UV-Vis analysis and Nigde Omer Halisdemir University Center Research Laboratory for Laser-Raman analysis. The valuable help of Assoc. Prof. Dr. Halil Gokce, Assoc. Prof. Dr. Halil Oturak, Asst. Prof. Adnan Saglam, Asst. Prof. Firdevs Banu Ozdemir, Pharmaceutist Ali Unsal Keskiner, and Res. Asst. Mecit Oge is also acknowledged
