16 results on '"Ates, C."'
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2. Investigating the effects of creative educational modules blended with Cognitive Research Trust (CoRT) techniques and Problem Based Learning (PBL) on students' scientific creativity skills and perceptions in science education
- Author
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Bulut Ates, C. and Aktamis, H.
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- 2024
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3. Intensifying interfacial oscillations in falling film flows over rectangular corrugations.
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Düll, A., Cros-Le Lagadec, A., Buchmüller, J., Häber, T., Ates̗, C., and Börnhorst, M.
- Subjects
FILM flow ,FALLING films ,UNSTEADY flow ,SURFACE structure ,TIME series analysis - Abstract
Unsteady film flows play an important role in intensifying heat and mass transfer processes, with applications, e.g., in falling film absorbers or reactors. In this context, the influence of surface structure modification on the wave dynamics of falling film flows is experimentally investigated based on localized film thickness time series data. Arrays of rectangular ridges oriented perpendicular to the main flow direction are considered, and an optimum ridge distance is identified, at which particularly strong interfacial oscillations are induced in the falling film. These potentially result from the interaction of the flow with a statically deformed base film under resonance-like conditions. The transient destabilization is amplified in the case of narrow ridge sizes, where inertia-driven flow features are particularly pronounced. With regard to mass transfer applications, the structure-induced increase in gas–liquid interfacial area may be of secondary importance compared to changes in internal flow conditions. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Investigating the Effects of Creative Educational Modules Blended with Cognitive Research Trust (CoRT) techniques and Problem Based Learning (PBL) on Students' Scientific Creativity Skills and Perceptions in Science Education
- Author
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Ates, C. Bulut, primary and Aktamis, H., additional
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- 2024
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5. A Holistic View on Urea Injection for NOxEmission Control: Impingement, Re-atomization, and Deposit Formation
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Dörnhöfer, J., Börnhorst, M., Ates, C., Samkhaniani, N., Pfeil, J., Wörner, M., Koch, R., Bauer, H.-J., Deutschmann, O., Frohnapfel, B., and Koch, T.
- Abstract
The injection of urea-water solution (UWS) sprays into engine-close selective catalytic reduction (SCR) systems faces developers with complex challenges regarding two-phase flow and deposit formation. Potential spray impact on the static mixing elements inside the exhaust duct can lead to accumulation of liquid film and solid deposits, which may result in detachment of large UWS droplets at the trailing edges of the mixer blades. Present work focuses on the mechanisms of film and deposit formation within the scope of a joint study on spray preparation in the mixing section of SCR systems. A production type SCR exhaust system is used for optical investigations on gas flow and UWS droplets at the mixing element using Laser Doppler Anemometry (LDA) and Long Distance Microscopy (LDM) with a high-speed camera. Measured shear flows inside the mixing element are up to three times higher than the flow velocity upstream the mixer. Here, a decrease of droplet diameters of detached droplets is revealed with increased shear flow velocity. Characteristic urea deposits are created in a laboratory test bench and their surface structure is measured by use of Confocal Microscopy. Results show highly rough surface structures, which are used as input parameters together with the flow measurements to define the computational domain at the trailing edge of the mixer blades. Smoothed Particle Hydrodynamics (SPH) method is adopted for the numerical simulation of the transient two-phase flow and validated by LDM high-speed recordings of droplet detachment. Comparisons reveal a distinct influence of solid depositions on the re-atomization of the liquid film at the rear edge of the mixer blade. By interface resolving simulations with a phase-field method, the wall impingement of a sequence of large secondary droplets and associated film formation are studied. The results indicate that UWS film formation at the exhaust pipe wall may be reduced by hydrophobic surfaces and high gas velocities near the wall.
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- 2024
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6. Effects of Innovation Capabilities on Organisational Sustainability: Evidence from an Emerging Economy
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Esen, S., Saygili, M., and Ates, C.
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сталість ,organisational sustainability ,економіка ,innovation capabilities ,emerging economy ,організаційна стійкість ,sustainability ,інноваційна спроможність ,розвиток - Abstract
Роль бізнесу в забезпеченні сталого розвитку набуває дедалі більшого значення разом зі зростанням швидкості технологічного прогресу, а також економічними наслідками зміни клімату, пандемій, катастроф і воєн. Спроможність підприємств адаптуватися до умов навколишнього середовища, ефективно використовувати свої ресурси та перетворювати їх на виробничі результати вважається критично важливим фактором у досягненні стійкої конкурентної переваги. Тому метою даного дослідження було визначити вплив маркетингових, процесних, організаційних та продуктових інноваційних можливостей підприємств на корпоративну стійкість. Вибірку дослідження сформовано на основі опитування керівників 452 малих та середніх підприємств в країнах з перехідною економікою (Туреччині) з використанням методу невипадкової квотної вибірки. Під час збору даних було проведено опитування виробничих фірм, що працюють у провінціях Коджаелі, Сакарья, Дюзче, Ялова та Болу в регіоні TR42 у Східному Мармуровому регіоні, який є важливим промисловим регіоном Туреччини. У статті використано програмний продукт SPSS для визначення описової статистики, а також AMOS – для отримання вивідних економіко-математичних результатів. У цьому контексті для перевірки причинно-наслідкових зв'язків організаційної стійкості зі змінними, що становлять інноваційну спроможність, було використано коваріаційне моделювання структурних рівнянь (SEM). Отримані результати свідчать про те, що маркетингова, процесна, корпоративна та продуктова інноваційна спроможність має вплив на підвищення організаційної стійкості. Крім того, результати вказують на те, що маркетингова інноваційна спроможність має більший вплив на організаційну стійкість, ніж інші складові інноваційної спроможності. Це дослідження пропонує важливі інтерпретації та висновки для підприємств, які працюють в економіці, що розвивається, на рівні малих та середніх підприємств, щоб покращити свої цілі сталого розвитку з точки зору ефективності використання ресурсів, спроможності та адаптації до навколишнього природнього середовища. The role of businesses in sustainable development gained increasingly more importance, together with the increasing speed of technological advancements, in addition to the economic effects of climate change, pandemics, disasters, and wars. The capabilities of businesses allowing them to adapt to environmental conditions to use their resources and turn them into productive outputs efficiently are considered critical factors in achieving sustainable competitive advantage. Therefore, the present study aimed to determine the effects of businesses' marketing, process, organisational, and product innovation capabilities on corporate sustainability. The data used in the present study, which has an explanatory research design, were collected from managers of 452 SMEs in an emerging economy (Turkey) using the non-random quota sampling method. During the data collection, a survey was carried out on the manufacturing firms operating in Kocaeli, Sakarya, Düzce, Yalova, and Bolu provinces in a region called TR42 in the Eastern Marmara region, which is an important industrial region in Turkey. During the data analysis, SPSS was used to obtain the descriptive statistics, and AMOS to obtain the inferential statistics. Within this context, covariance-based Structural Equation Modelling (SEM) was utilised to test organisational sustainability's causal relationships with variables constituting the innovation capabilities. The results achieved here suggest that marketing, process, corporate, and product innovation capabilities have an effect that increases organisational sustainability. Furthermore, the results indicate that marketing innovation capability had a higher impact on organisational sustainability than other capacities constituting the innovation capability. The present study offers important interpretations and conclusions for businesses which operate in an emerging economy at the level of SME to improve their sustainability objectives in terms of resource, capability, and environmental adaptation.
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- 2023
7. Disease-free survival and the prognostic factors affecting disease-free survival in patients with medullary thyroid carcinoma: a multicenter cohort study.
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Zuhur SS, Ozturk BO, Keskin U, Uysal S, Hacioglu A, Avci U, Karsli S, Andac B, Ozbay UN, Kilinc F, Erol S, Catak M, Sodan H, Pekkolay Z, Burhan S, Akbaba G, Ates C, Yorulmaz G, Tekin S, Topcu B, Tuna MM, Kadioglu P, Gonen MS, Karaca Z, Ciftci S, Celik M, Guldiken S, Tuzun D, Altuntas Y, Akturk M, Niyazoglu M, Cinar N, Gul OO, Kebapci MN, Akalin A, Bayraktaroglu T, and Elbuken G
- Subjects
- Humans, Male, Female, Middle Aged, Adult, Prognosis, Retrospective Studies, Disease-Free Survival, Aged, Neoplasm Recurrence, Local, Cohort Studies, Young Adult, Adolescent, Thyroidectomy, Thyroid Neoplasms mortality, Thyroid Neoplasms pathology, Thyroid Neoplasms therapy, Carcinoma, Neuroendocrine mortality, Carcinoma, Neuroendocrine pathology, Carcinoma, Neuroendocrine therapy
- Abstract
Purpose: Despite several factors that may have been associated with poor disease-free survival (DFS) in patients with medullary thyroid carcinoma (MTC), only a few studies have evaluated the prognostic factors affecting DFS in MTC patients. Therefore, this study evaluated the prognostic factors affecting DFS, in a large number of patients with MTC., Methods: Patients treated for MTC were retrospectively analyzed. Patients were stratified as having persistent/recurrent disease and no evidence of disease (NOD) at the last follow-up. The factors affecting DFS after the initial therapy and during the follow-up period were investigated., Results: This study comprised 257 patients [females 160 (62.3%), hereditary disease 48 (18.7%), with a mean follow-up time of 66.8 ± 48.5 months]. Persistent/recurrent disease and NOD were observed in 131 (51%) and 126 (49%) patients, respectively. In multivariate analysis, age > 55 (HR: 1.65, p = 0.033), distant metastasis (HR: 2.41, p = 0.035), CTN doubling time (HR: 2.7, p = 0.031), and stage III vs. stage II disease (HR 3.02, p = 0.048) were independent predictors of persistent/recurrent disease. Although 9 (8%) patients with an excellent response after the initial therapy experienced a structural recurrence, the absence of an excellent response was the strongest predictor of persistent/recurrent disease (HR: 5.74, p < 0.001)., Conclusions: The absence of an excellent response after initial therapy is the strongest predictor of a worse DFS. However, a significant proportion of patients who achieve an excellent response could experience a structural recurrence. Therefore, careful follow-up of patients, including those achieving an excellent response is essential., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
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- 2024
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8. Unraveling the impact of therapeutic drug monitoring via machine learning for patients with sepsis.
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Ates HC, Alshanawani A, Hagel S, Cotta MO, Roberts JA, Dincer C, and Ates C
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- Humans, Male, Female, Middle Aged, Aged, beta-Lactams therapeutic use, Anti-Bacterial Agents therapeutic use, Algorithms, Critical Illness, Organ Dysfunction Scores, Machine Learning, Sepsis drug therapy, Sepsis diagnosis, Drug Monitoring methods
- Abstract
Clinical studies investigating the benefits of beta-lactam therapeutic drug monitoring (TDM) among critically ill patients are hindered by small patient groups, variability between studies, patient heterogeneity, and inadequate use of TDM. Accordingly, definitive conclusions regarding the efficacy of TDM remain elusive. To address these challenges, we propose an innovative approach that leverages data-driven methods to unveil the concealed connections between therapy effectiveness and patient data, collected through a randomized controlled trial (DRKS00011159; 10th October 2016). Our findings reveal that machine learning algorithms can successfully identify informative features that distinguish between healthy and sick states. These hold promise as potential markers for disease classification and severity stratification, as well as offering a continuous and data-driven "multidimensional" Sequential Organ Failure Assessment (SOFA) score. The positive impact of TDM on patient recovery rates is demonstrated by unraveling the intricate connections between therapy effectiveness and clinically relevant data via machine learning., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
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- 2024
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9. The relationship between Fc epsilon receptor-1α and β ( FCER1A and FCER1B ) gene polymorphisms in patients with chronic urticaria using omalizumab.
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Savas H, Ozkol HU, Gorgisen G, Özkol H, Ates C, Metin A, and Özdemir İY
- Abstract
Introduction: Chronic urticaria requires well-defined treatment strategies in order to achieve a maximum treatment response and maintain the quality of life. Since 2014, omalizumab has been used in chronic urticaria. However, many studies showed that some patients are resistant to omalizumab., Aim: To determine the effects of single nucleotide changes in the FCER1A and FCER1B genes, which are thought to be related to resistance mechanisms, in our population of patients who have not responded to omalizumab treatment., Material and Methods: We included 100 patients with chronic urticaria who were treated with omalizumab and 50 healthy individuals. Frequently observed gene polymorphisms, FCER1A (rs2251746) and FCER1B (rs569108), were examined in peripheral blood samples. The regions of rs2251746 and rs569108 gene polymorphisms were amplified using fluorescently labelled probes through real-time polymerase chain reaction (PCR). The analysis was performed bioinformatically via the SNP genotype profiling program., Results: There was no statistically significant relationship between FCER1A (rs2251746) and FCER1B (rs569108) gene polymorphisms in patients and their clinical, demographic characteristics, and the resistance to treatment ( p > 0.05). In our study, the mean patient age was found to be higher in the CT group (44.71 ±12.5 years) compared to the TT group (37.34 ±11.5 years) only in the rs2251746 polymorphism ( p < 0.05)., Conclusions: In our study, there was no significant relationship between FCER1A and FCER1B gene polymorphisms and resistance to omalizumab therapy. Further, multicentre, large-scale studies are needed to support our results., Competing Interests: The authors declare no conflict of interest., (Copyright: © 2024 Termedia Sp. z o. o.)
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- 2024
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10. Motherhood Role from a Postpartum Perspective: Effects Reflected by High-Risk and Normal Pregnancies.
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Sarı E and Ates C
- Abstract
High-risk pregnancies not only heighten concerns about the baby's health but also have the potential to impact the mother-infant relationship by shifting the mother's focus towards her own health needs. This study aims to delve into the intricacies of motherhood roles among women experiencing high-risk pregnancies compared to those with uncomplicated pregnancies, aiming to shed light on the disparities between the two groups. The participants of this descriptive, comparative, and correlational study consisted of literate mothers admitted to a hospital in Eastern Turkey, diagnosed with high-risk pregnancies, and with no prior history of psychological support. Due to an inability to reach the entire population, an unknown sampling method was employed for sampling calculation. The sample comprised 133 mothers with high-risk pregnancies and an equal number of healthy mothers, totaling 266 participants. Data were collected using the "Maternal Introduction Form" and the "Maternal Role Gaining Scale", and analyses were conducted using the SPSS Statistical Programme. Given the non-normal distribution of the variables, nonparametric tests were applied post reliability analysis. There is a statistically significant difference ( p < 0.05) in the scores of maternal attitude and anxiety, as well as maternal role and the Maternal Role Gaining Scale, based on various demographic factors such as marriage duration, spouse's education, family economic status, pre-pregnancy health issues, medication use, hospitalization status and reason, assigned sex of the baby and desired gender, total pregnancies, mode of delivery, postpartum difficulties, support for baby care, feeding method, high-risk pregnancy diagnosis, and week of diagnosis. A Bonferroni corrected analysis also revealed significant differences between mothers with and without high-risk pregnancies.
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- 2024
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11. The Relation between Plasma Nesfatin-1 Levels and Aggressive Behavior in Pit Bull Dogs.
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Guvenc-Bayram G, Semen Z, Polat-Dincer PF, Sertkaya ZT, Ustundag Y, Ates C, Aktas B, and Yalcin M
- Abstract
Aggression is a prevalent and concerning behavioral issue in dogs. Pit Bull dogs, known for their high levels of aggression, are recognized as a focus of concern in society. In our study, we aimed to investigate the behavioral characteristics of Pit Bull dogs and explore the potential roles of peptides involved in the neurobiology of aggression. Initially, female, and male dogs underwent aggression tests, and their aggression levels were categorized. Plasma nesfatin-1, serotonin, oxytocin, and dopamine levels were quantified using ELISA, with blood samples collected after a 24 h fasting period and 2 h post-refeeding. Our findings indicate that aggression in Pit Bull dogs correlates with decreased plasma nesfatin-1, serotonin, and oxytocin levels, while dopamine levels increase. The study's findings indicate that fasted dogs exhibited lower plasma levels of nesfatin-1, serotonin, and dopamine, while plasma oxytocin levels were higher. Furthermore, while the research findings do not suggest a significant relationship between the severity of aggression and the gender of the dog, male Pit Bull breeds appear to have higher plasma nesfatin-1 and serotonin levels compared to their female counterparts. The study's findings demonstrate that nesfatin-1, serotonin, oxytocin, and dopamine play pivotal roles in Pit Bull dogs' aggression, indicating potential interactions among these neuropeptides at the central nervous system level.
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- 2024
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12. How reliable is the statistical evaluation using the 'mean' in an abnormally distributed dataset?
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Tandircioglu UA, Ates C, and Alan S
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- Humans, Models, Statistical
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- 2024
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13. The effect of antiangiogenic agent aflibercept on surgically induced endometriosis in a rat model.
- Author
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Ates C, Dilbaz B, Ergani SY, and Atabay F
- Subjects
- Female, Humans, Rats, Animals, Leuprolide pharmacology, Leuprolide therapeutic use, Rats, Wistar, Angiogenesis Inhibitors pharmacology, Angiogenesis Inhibitors therapeutic use, Vascular Endothelial Growth Factor A, Endometriosis complications, Endometriosis drug therapy, Recombinant Fusion Proteins, Receptors, Vascular Endothelial Growth Factor
- Abstract
Objective: The aim of the study is to show for the first time how aflibercept affects endometriosis lesions., Material and Methods: Surgically induced endometriosis in Wistar albino female rats. Rats with endometriosis were randomly divided into three groups: control (Co), aflibercept (Af), and leuprolide acetate (Le). Then, Af, aflibercept, and Le received leuprolide acetate. The control group was not treated. The weights and changes in intra-abdominal adhesions of the rats before and after treatment were recorded according to the Blauer adhesion score. Blood extracted for sacrifice was analyzed. Endometriotic lesions were evaluated for size, volume, histology, and immunohistochemistry (vascular endothelial growth factor [VEGF] and CD31). Significance level was accepted as p < 0.05., Results: Aflibercept significantly reduced endometrial implant volume (p = 0.002). The explant epithelial histological score showed a significant difference between aflibercept and leuprolide acetate (p = 0.006) and between aflibercept and control groups (p = 0.002). Aflibercept decreased VEGF-H and CD31 expression (p = 0.001) more than leuprolide acetate. Aflibercept improved adhesions (p = 0.006)., Conclusion: Aflibercept is more successful than leuprolide acetate in the treatment of endometriosis., (Copyright: © 2023 Permanyer.)
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- 2024
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14. Vibration-Based Wear Condition Estimation of Journal Bearings Using Convolutional Autoencoders.
- Author
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Ates C, Höfchen T, Witt M, Koch R, and Bauer HJ
- Abstract
Predictive maintenance is considered a proactive approach that capitalizes on advanced sensing technologies and data analytics to anticipate potential equipment malfunctions, enabling cost savings and improved operational efficiency. For journal bearings, predictive maintenance assumes critical significance due to the inherent complexity and vital role of these components in mechanical systems. The primary objective of this study is to develop a data-driven methodology for indirectly determining the wear condition by leveraging experimentally collected vibration data. To accomplish this goal, a novel experimental procedure was devised to expedite wear formation on journal bearings. Seventeen bearings were tested and the collected sensor data were employed to evaluate the predictive capabilities of various sensors and mounting configurations. The effects of different downsampling methods and sampling rates on the sensor data were also explored within the framework of feature engineering. The downsampled sensor data were further processed using convolutional autoencoders (CAEs) to extract a latent state vector, which was found to exhibit a strong correlation with the wear state of the bearing. Remarkably, the CAE, trained on unlabeled measurements, demonstrated an impressive performance in wear estimation, achieving an average Pearson coefficient of 91% in four different experimental configurations. In essence, the proposed methodology facilitated an accurate estimation of the wear of the journal bearings, even when working with a limited amount of labeled data.
- Published
- 2023
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15. Deposit formation from evaporating urea-water droplets on substrates of different wettability.
- Author
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Schumacher O, Ates C, Börnhorst M, Koch R, and Stephan P
- Subjects
- Wettability, Surface Properties, Temperature, Crystallization, Water chemistry
- Abstract
Hypothesis: During the evaporation of urea water solution (UWS), the wall temperature and surface properties influence the dynamics of deposit formation by affecting the internal mass transport. These effects are expected to be reflected in the resulting deposit morphology and allow different deposit regimes to be distinguished., Experiments: The temperature of metallic substrates is varied for three different surface treatments to analyze the wetting, evaporation behavior and the crystallization process of single UWS droplets in situ using a high-speed camera. The deposit morphology is captured by confocal microscopy and analyzed via the power spectral density method (PSD). PSD is used to extract the height of different surface features for each deposit, providing valuable information about the local crystallization history., Findings: A significant influence of the surface properties on the crystallization process as well as on the morphology of the final deposit is found. The influence of wettability is described by the resulting internal mass transport, which determine the urea distribution. PSD analysis quantified distinct trends in the scaling tendencies of the deposit aggregates under different wall conditions. The local crystal growth history extracted by PSD agrees well with proposed crystallization mechanisms, which is further supported by high-speed and SEM imaging., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Inc. All rights reserved.)
- Published
- 2023
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16. Association of insulin-like growth factor binding protein-7 promoter methylation with esophageal cancer in peripheral blood.
- Author
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Kaya Z, Almalı N, Sahin ES, Duran S, Görgisen G, and Ates C
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- Globulins analysis, Humans, Middle Aged, Promoter Regions, Genetic, RNA, Messenger genetics, DNA Methylation, Esophageal Neoplasms genetics, Insulin-Like Growth Factor Binding Proteins genetics
- Abstract
Background: The insulin-like growth factor (IGF) signaling pathway has an important role in many cancers, including esophageal cancer (EC). IGF-binding protein 7 (IGFBP7) is one of the proteins in this signaling pathway, and its role in cancer has not yet been fully clarified. In the present study, we evaluated the clinical relevance of IGFBP7 methylation status and mRNA expression in EC patients compared to healthy controls. We also investigated whether IGFBP7 methylation status affects mRNA expression., Methods: The study comprised 100 EC patients and 105 healthy controls. Methylation specific PCR (MSP) was used to examine IGFBP7's promoter methylation and real-time quantitative reverse transcription PCR (qRT-PCR) was used to assess IGFBP7 mRNA expression., Results: The IGFBP7 promoter methylation was significantly higher in controls than in EC patients (p < 0.05). IGFBP7 mRNA expression was significantly lower in EC patients compared to controls, especially in those over 55 years old (p < 0.0001). The globulin level and reflux were significantly higher in IGFBP7-unmethylated patients compared to IGFBP7 methylated patients (p = 0.01). In EC patients, however, there was no significant relationship between IGFBP7 mRNA expression and methylation in the peripheral blood (p = 0.33). In addition, neither IGFBP7 mRNA expression nor methylation were shown to be linked with survival (p > 0.05)., Conclusion: Our study indicated that promoter unmethylation and mRNA expression of the IGFBP7 promoter in peripheral blood could be different biomarkers for EC. Furthermore, unmethylation of the IGFBP7 promoter in EC patients was associated with reflux and elevated globulin levels. More studies with a larger number of cases is needed to confirm this association., (© 2022. The Author(s), under exclusive licence to Springer Nature B.V.)
- Published
- 2022
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- View/download PDF
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