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  1. Article ; Online: Benign Paroxysmal Positional Vertigo: Is It Really an Otolith Disease?

    Koç, Ahmet

    The journal of international advanced otology

    2022  Volume 18, Issue 1, Page(s) 62–70

    Abstract: The current theory in physiopathology of benign paroxysmal positional vertigo is the mechanical theory, namely the cupulolithiasis-canalolithiasis theory. Repositioning maneuvers based on this theory has now taken place in therapy. However, mechanical ... ...

    Abstract The current theory in physiopathology of benign paroxysmal positional vertigo is the mechanical theory, namely the cupulolithiasis-canalolithiasis theory. Repositioning maneuvers based on this theory has now taken place in therapy. However, mechanical theory is insufficient to explain some clinical situations and cannot fully enlighten the physiopathology. Mechanical theory is based on very few histological studies. Currently, these few articles are still used for reference. Anatomically, there are uncertainties that need to be explained in this theory. In this literature review, the histological and anatomical evidence is reviewed and the value of mechanical theory in benign paroxysmal positional vertigo physiopathology has been questioned. Studies suggest that the debris in the semicircular canals is caused by degeneration due to aging and may not be responsible for the symptoms in benign paroxysmal positional vertigo. Some patients with debris in semicircular canals do not have benign paroxysmal positional vertigo symptomatology, while some patients without debris may have benign paroxysmal positional vertigo symptomatology. Experimental and histological findings suggest that vestibulopathy due to inflammation caused by neurotropic viruses may lead to benign paroxysmal positional vertigo picture. For all these reasons, in benign paroxysmal positional vertigo physiopathology, there must be other factors besides particle debris in semicircular canals.
    MeSH term(s) Benign Paroxysmal Positional Vertigo/therapy ; Humans ; Inflammation/pathology ; Otolithic Membrane ; Patient Positioning ; Semicircular Canals/pathology
    Language English
    Publishing date 2022-03-01
    Publishing country Turkey
    Document type Journal Article ; Review
    ZDB-ID 2561231-1
    ISSN 2148-3817 ; 1308-7649 ; 2148-3817
    ISSN (online) 2148-3817
    ISSN 1308-7649 ; 2148-3817
    DOI 10.5152/iao.2022.21260
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The effect of different area uses and topography on surface temperature and climate parameters.

    Özhancı, Esra / Koç, Ahmet

    Environmental science and pollution research international

    2023  Volume 30, Issue 16, Page(s) 47038–47051

    Abstract: Global warming and the ecological burden it causes affect people and the environment negatively and make adaptation difficult. For people to adapt to the environment and vice versa, they need to do extensive research and planning. Planning, on the other ... ...

    Abstract Global warming and the ecological burden it causes affect people and the environment negatively and make adaptation difficult. For people to adapt to the environment and vice versa, they need to do extensive research and planning. Planning, on the other hand, is taking an easy form with the technology that has recently developed. GIS infrastructures and supporting satellite images along with software help with provincial-scale planning. This study has been handled on a scale covering the provincial borders of Nevsehir. The thermal data of the 10-year-old Landsat 7 satellite was analyzed and mapped in the Arc-GIS 10.2 package program. In the same way, maps of wind, air temperature, topography, and land use were created and the relationship between them was revealed by "Spearman's correlation" method. According to the results obtained, the average surface temperature in the study area was determined as 34.4 °C. When evaluated in terms of land use, natural grasslands have the highest surface temperature of 40.6 °C, while city structures have the highest average surface temperature of 33.3 °C. At the same time, the lowest surface temperature measured in the study area, 13.8 °C, is also found in natural grassland areas. A significant positive correlation was measured between the wind speed and the land use pattern, while a significant negative correlation emerged between the wind speed and the air temperature. In addition, there is another significant negative correlation between height and land surface temperature (LST). Furthermore, a high degree of positive significance was determined between altitude and wind speed. Finally, between air temperature and LST, a positive significance was observed.
    MeSH term(s) Child ; Humans ; Cities ; Climate ; Environmental Monitoring/methods ; Hot Temperature ; Temperature ; Urbanization
    Language English
    Publishing date 2023-02-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-023-25580-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Boron stress signal is transmitted through the TOR pathway.

    Yilmaz, İrem Uluisik / Koc, Ahmet

    Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)

    2023  Volume 79, Page(s) 127222

    Abstract: Although boron is an essential element for many organisms, an excess amount of it can cause toxicity, and the mechanism behind this toxicity is not yet fully understood. The Gcn4 transcription factor plays a crucial role in the boron stress response by ... ...

    Abstract Although boron is an essential element for many organisms, an excess amount of it can cause toxicity, and the mechanism behind this toxicity is not yet fully understood. The Gcn4 transcription factor plays a crucial role in the boron stress response by directly activating the expression of the boron efflux pump Atr1. More than a dozen transcription factors and multiple cell signaling pathways have roles in regulating the Gcn4 transcription factor under various circumstances. However, it is unknown which pathways or factors mediate boron signaling to Gcn4. Using the yeast Saccharomyces cerevisiae as a model, we analyzed the factors that converge on the Gcn4 transcription factor to assess their possible roles in boron stress signaling. Our findings show that the GCN system is activated by uncharged tRNA stress in response to boron treatment and that GCN1, which plays a role in transferring uncharged tRNAs to Gcn2, is necessary for the kinase activity of Gcn2. The SNF and PKA pathways were not involved in mediating boron stress, even though they interact with Gcn4. Mutations in TOR pathway genes, such as GLN3 and TOR1, abolished Gcn4 and ATR1 activation in response to boric acid treatment. Therefore, our study suggests that the TOR pathway must be functional to form a proper response against boric acid stress.
    MeSH term(s) Saccharomyces cerevisiae Proteins/genetics ; Saccharomyces cerevisiae Proteins/metabolism ; Protein Kinases/metabolism ; Boron/pharmacology ; Boron/metabolism ; DNA-Binding Proteins/genetics ; DNA-Binding Proteins/metabolism ; Saccharomyces cerevisiae/metabolism ; Transcription Factors/metabolism ; RNA, Transfer/genetics ; RNA, Transfer/metabolism ; Protein Biosynthesis
    Chemical Substances boric acid (R57ZHV85D4) ; Saccharomyces cerevisiae Proteins ; Protein Kinases (EC 2.7.-) ; Boron (N9E3X5056Q) ; DNA-Binding Proteins ; Transcription Factors ; RNA, Transfer (9014-25-9) ; GLN3 protein, S cerevisiae
    Language English
    Publishing date 2023-05-24
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1236267-0
    ISSN 1878-3252 ; 1611-602X ; 0946-672X
    ISSN (online) 1878-3252 ; 1611-602X
    ISSN 0946-672X
    DOI 10.1016/j.jtemb.2023.127222
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Evaluation of video head impulse test during vertiginous attack in vestibular migraine.

    Koç, Ahmet / Akkılıç, Elvan Cevizci

    Acta otorhinolaryngologica Italica : organo ufficiale della Societa italiana di otorinolaringologia e chirurgia cervico-facciale

    2022  Volume 42, Issue 3, Page(s) 281–286

    Abstract: Objective: The aim of this study is to evaluate vestibular functions with video head impulse test (VHIT) and to understand the value of VHIT in differential diagnosis in patients with vestibular migraine (VM) during dizziness attack.: Materials and ... ...

    Abstract Objective: The aim of this study is to evaluate vestibular functions with video head impulse test (VHIT) and to understand the value of VHIT in differential diagnosis in patients with vestibular migraine (VM) during dizziness attack.
    Materials and methods: Two groups were enrolled in this study. The first consisted of 84 vestibular migraine patients, and second group of 74 healthy subjects. VHIT was applied to patients with VM during vertigo attack and the results were compared with the VHIT values applied to subjects in the control group.
    Results: The mean vestibulo-ocular reflex (VOR) in all semicircular canals in the VM group was lower than healthy individuals, but the results were not statistically significant. Refixation saccades were found in 52.3% of VM patients and in 10.2% of healthy individuals.
    Conclusions: When patients with VM were evaluated with VHIT during vertiginous attack, VOR gain values were not different from healthy individuals, but the number of catch-up saccades were higher in VM patients, which indicates peripheral vestibular involvement. For differential diagnosis in patients with VM, vestibular tests should be performed during the vertigo attack. When evaluating VHIT results, the presence of refixation saccades should also be evaluated.
    MeSH term(s) Head Impulse Test/methods ; Humans ; Migraine Disorders/complications ; Migraine Disorders/diagnosis ; Reflex, Vestibulo-Ocular ; Semicircular Canals ; Vertigo/diagnosis ; Vertigo/etiology
    Language English
    Publishing date 2022-07-25
    Publishing country Italy
    Document type Journal Article
    ZDB-ID 604898-5
    ISSN 1827-675X ; 0392-100X
    ISSN (online) 1827-675X
    ISSN 0392-100X
    DOI 10.14639/0392-100X-N1951
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Preparation, Controlled Drug Release, and Cell Viability Evaluation of Tenofovir Alafenamide‐Loaded Chitosan Nanoparticles

    Ulu, Ahmet / Sezer, Selcen Korkmaz / Yüksel, Şengül / Koç, Ahmet / Ateş, Burhan

    Starch ‐ Stärke. 2024 Jan., v. 76, no. 1-2 p.e2100144-

    2024  

    Abstract: Tenofovir alafenamide (TAF) is used as a hepatitis B virus (HBV) nucleotide reverse transcriptase inhibitor for the treatment of chronic HBV infection. However, the use of TAF suffers from its poor solubility and low bioavailability. Therefore, this ... ...

    Abstract Tenofovir alafenamide (TAF) is used as a hepatitis B virus (HBV) nucleotide reverse transcriptase inhibitor for the treatment of chronic HBV infection. However, the use of TAF suffers from its poor solubility and low bioavailability. Therefore, this study prepared and characterized chitosan nanoparticles (CHS NPs) loaded with TAF. Morphological findings demonstrated that CHS NPs are roughly spherical and homogeneous in shape. Besides, TAF‐loaded CHS NPs displayed the hydrodynamic diameter, zeta potential, and PDI of approximately 340 nm, 48.9 mV, and 0.65, respectively. The encapsulation efficiency is at about 50%, and TAF is released about 93% at the end of 80 hours at pH 7.4. In addition, human hepatocellular carcinoma cells (HepG2) are used for cell viability studies and it is observed that TAF‐loaded CHS NPs has 1.24 times less viable cells as compared to the control. Collectively, TAF‐loaded CHS NPs could be used as an efficient formulation for the treatment of chronic HBV infection.
    Keywords Hepatitis B virus ; RNA-directed DNA polymerase ; bioavailability ; cell viability ; chitosan ; drugs ; encapsulation ; hepatoma ; humans ; hydrodynamics ; nanoparticles ; pH ; solubility ; starch ; zeta potential
    Language English
    Dates of publication 2024-01
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 241168-4
    ISSN 0038-9056
    ISSN 0038-9056
    DOI 10.1002/star.202100144
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: The Effect Failing to Perform Extracurricular Activities Has Had on School Culture and Values Education During the COVID-19 Pandemic.

    Koç, Sümeyye / Koç, Ahmet

    Frontiers in psychology

    2021  Volume 12, Page(s) 778678

    Language English
    Publishing date 2021-10-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2563826-9
    ISSN 1664-1078
    ISSN 1664-1078
    DOI 10.3389/fpsyg.2021.778678
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Effects of vestibular rehabilitation in the management of patients with and without vestibular migraine.

    Koc, Ahmet / Cevizci Akkılıc, Elvan

    Brazilian journal of otorhinolaryngology

    2021  Volume 88 Suppl 3, Page(s) S25–S33

    Abstract: Objective: Vestibular Migraine (VM) is the second most common cause in patients with vertigo. Patients with VM complain about vestibular symptoms during a headache attack or during the period between attacks. Vestibular Rehabilitation (VR), an exercised ...

    Abstract Objective: Vestibular Migraine (VM) is the second most common cause in patients with vertigo. Patients with VM complain about vestibular symptoms during a headache attack or during the period between attacks. Vestibular Rehabilitation (VR), an exercised based therapy to treat dizziness and balance dysfunction has been shown to be effective in vestibular diseases. In this study, we aimed to assess the effect of VR for vestibular symptoms and quality of life in VM patients, and to compare the results with patients with vestibular disorders without migraine.
    Methods: Sixty (60) patients who received VR treatment were divided into two groups: vestibular migraine group (30 patients) and non-migraine vestibular dysfunction group (30 patients). All patients received VR for 18 sessions and the program was completed in 1.5 months. Pre- and post-treatment Dizziness Handicap Inventory (DHI) scores, Vestibular Disorders Activities of Daily Living Scale (VADL) scores, the frequency of dizziness and headache, and Computerized Dynamic Posturography (CDP) scores were assessed and compared retrospectively.
    Results: With VR in both the vestibular migraine group and vestibular dysfunction group, DHI score, VADL score, the frequency of dizziness and headache scores significantly impaired. Post-treatment CDP results were higher than pre- treatment results for both patient groups.
    Conclusion: With VR, a significant improvement was observed in subjective and objective balance assessment measurement. Vestibular Rehabilitation must be considered in patients who do not benefit from medical therapy or have limited benefit.
    Level of evidence: Level III (evidence obtained from well-designed controlled trials without randomization).
    Language English
    Publishing date 2021-10-25
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 2428110-4
    ISSN 1808-8686 ; 1808-8694
    ISSN (online) 1808-8686
    ISSN 1808-8694
    DOI 10.1016/j.bjorl.2021.07.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: The roles of SFKs in the regulation of proinflammatory cytokines and NLRP3 in familial mediterranean fever patients.

    İçen Taşkın, Irmak / Gürbüz, Sevim / Koç, Ahmet / Kocabay, Samet / Yolbaş, Servet / Keser, Muhammed Furkan

    Cytokine

    2024  Volume 179, Page(s) 156615

    Abstract: Familial Mediterranean Fever (FMF) is caused by mutations in pyrin, a protein produced in innate immune cells that regulates the development of interleukin (IL)-1β by interacting with caspase-1 and other components of inflammasomes. Although ... ...

    Abstract Familial Mediterranean Fever (FMF) is caused by mutations in pyrin, a protein produced in innate immune cells that regulates the development of interleukin (IL)-1β by interacting with caspase-1 and other components of inflammasomes. Although overexpression of proinflammatory cytokines have been observed in FMF patients, no studies have been conducted on the role of Src family kinases (SFKs). The purpose of this study was to examine the impact of SFKs on the modulation of IL-1β, IL-6, IL-8, TNF-α, and NLRP3 inflammasome in patients with FMF. The study included 20 FMF patients and 20 controls. Peripheral blood mononuclear cells (PBMCs) were isolated by density gradient centrifugation. Protein expression levels of SFKs members were measured by western blot. The effect of lipopolysaccharide-induced (LPS) activation and PP2- induced inhibition of SFKs on NLRP3 and IL-1β, IL 6, IL-8, TNF-α were examined by western blot and flow cytometry respectively. Patients with FMF have considerably greater levels of Lck expression. In addition, patients had a substantially greater basal level of NLRP3 than the control group (*p = 0.016). Most importantly, the levels of IL-1 β were elevated with LPS stimulation and reduced with PP2 inhibition in FMF patients. These results suggest that SFKs are effective in regulation of IL-1 β in FMF patients.
    Language English
    Publishing date 2024-04-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 1018055-2
    ISSN 1096-0023 ; 1043-4666
    ISSN (online) 1096-0023
    ISSN 1043-4666
    DOI 10.1016/j.cyto.2024.156615
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Effects of central FGF21 infusion on the glucose homeostasis in rats (brain-pancreas axis).

    Tanbek, Kevser / Yılmaz, Umit / Gul, Mehmet / Koç, Ahmet / Sandal, Suleyman

    Archives of physiology and biochemistry

    2023  , Page(s) 1–8

    Abstract: Introduction: Glucose homeostasis is a physiological process mediated by a variety of hormones. Fibroblast growth factor (FGF) 21 is a protein expressed in the liver, adipose tissue, muscle and pancreas and exerts actions in multiple targets including ... ...

    Abstract Introduction: Glucose homeostasis is a physiological process mediated by a variety of hormones. Fibroblast growth factor (FGF) 21 is a protein expressed in the liver, adipose tissue, muscle and pancreas and exerts actions in multiple targets including adipose, liver, pancreas and hypothalamus. The aim of this study was to examine the possible involvement of FGF21 in pancreatic and central control of glucose by measuring reflective changes in the release of insulin and glucagon.
    Methods: Thirty adult male Wistar Albino rats were divided; Control, PD + aCSF, PD + FGF21 groups (
    Results: Administration of FGF21 to 3rd ventricle increased food consumption but body weight didn't change significantly. AgRP level increased, pancreatic insulin levels increased, and glucagon level decreased.
    Conclusion: Central FGF21 administration is effective in regulating blood glucose homeostasis by increasing the amount and efficiency of insulin and changing glucose use.
    Language English
    Publishing date 2023-01-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 1238320-x
    ISSN 1744-4160 ; 1381-3455
    ISSN (online) 1744-4160
    ISSN 1381-3455
    DOI 10.1080/13813455.2023.2166964
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Multi-criteria of PV solar site selection problem using GIS-intuitionistic fuzzy based approach in Erzurum province/Turkey.

    Türk, Seda / Koç, Ahmet / Şahin, Gökhan

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 5034

    Abstract: Renewable energy sources have been placed as the key to facilitating to provide source of electricity generation. Solar power is one of the most preferable one among renewable energy sources due to the easy to generate in suitable environment. However, ... ...

    Abstract Renewable energy sources have been placed as the key to facilitating to provide source of electricity generation. Solar power is one of the most preferable one among renewable energy sources due to the easy to generate in suitable environment. However, there are concerns with the location of solar power plants installation which causes low efficiency and ineffective use. Hence, determining the location for the usage of solar power sources is critical to mitigating those concerns. In addition, Turkey has been focused on investments on sustainable renewable energy sources and there are few studies which work on cities to reveal potential sources. In this study, GIS and intuitionistic fuzzy set based multi-criteria decision-making method is proposed for determining the most suitable areas for solar energy power plant potential site selection in Erzurum province, Turkey. Firstly, a solar energy power plant potential site selection map is made using a GIS program along with considering ecological risks and ecological criteria. Secondly, 20 districts of Erzurum are investigated in terms of 10 criteria (slope, aspect, solar irradiation, land use, wind speed, air temperature, air pressure, air humidity, land surface temperature and transmission line) using intuitionistic fuzzy sets. In these parameters the first time we looked the land use surface. The land use surface is affected the efficiency of the solar power plant. Finally, the comparisons of two methods are done to check consistency of results obtained. The results indicate that both approaches achieve same areas as the most suitable locations for solar power plants installations for Erzurum province in Turkey. The aim of this work is first to investigate possible locations for solar power plant installation using a mapping method, GIS, and then, Intuitionistic Fuzzy is applied to the problem to obtain optimum areas for solar energy. Also, more accurate results are provided comparing results of two methods, GIS and Intuitionistic Fuzzy. The results expose that 25,065.3 km
    Language English
    Publishing date 2021-03-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-84257-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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