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A Non-Newtonian Conics In Multiplicative Analytic Geometry, Aykut Has, Beyhan Yilmaz
A Non-Newtonian Conics In Multiplicative Analytic Geometry, Aykut Has, Beyhan Yilmaz
Turkish Journal of Mathematics
In this study, conics (circle, ellipse, hyperbola) are characterized by taking into account basic multiplicationoperations in multiplicative space. For this purpose, firstly multiplicative axes and regions are introduced. Additionally,the multiplicative cone definition is given and visualized on the figure. General definitions and theorems of non-Newtonianconics are given. Additionally, examples were given and drawings were made to make the resulting characterizations andtheorems more memorable.
On The Connection Between Σϵ(A1 ⊗ A2) And Σϵ(A1), Σϵ(A2) For Certain Specialoperators, Fati̇h Yilmaz
On The Connection Between Σϵ(A1 ⊗ A2) And Σϵ(A1), Σϵ(A2) For Certain Specialoperators, Fati̇h Yilmaz
Turkish Journal of Mathematics
In this paper, the connection between the ϵ -pseudospectrum of the tensor product operator A1 ⊗ A2 andthe ϵ -pseudospectrums of operators A1 and A2 has been investigated and some results are given about this connectionunder certain conditions.
Rings And Finite Fields Whose Elements Are Sums Or Differences Of Tripotents And Potents, Adel Abyzov, Stephen Cohen, Peter Danchev, Daniel Tapkin
Rings And Finite Fields Whose Elements Are Sums Or Differences Of Tripotents And Potents, Adel Abyzov, Stephen Cohen, Peter Danchev, Daniel Tapkin
Turkish Journal of Mathematics
We significantly strengthen results on the structure of matrix rings over finite fields and applythem to describe the structure of the so-called weakly n-torsion clean rings. Specifically, we establish that, forany field F with either exactly seven or strictly more than nine elements, each matrix over F is presentableas a sum of of a tripotent matrix and a q-potent matrix if and only if each element in F is presentable as asum of a tripotent and a q-potent, whenever q > 1 is an odd integer. In addition, if Q is a power of an oddprime and F is a field …
A Sufficient Condition For The Wildness Of An Automorphism Of A Free Leibnizalgebra, Zeynep Özkurt
A Sufficient Condition For The Wildness Of An Automorphism Of A Free Leibnizalgebra, Zeynep Özkurt
Turkish Journal of Mathematics
In this paper, we apply the criterion of Mikhalev and Umirbaev for the invertibility of an endomorphismof a finitely generated free Leibniz algebra via its Jacobian matrix to determine whether a given endomorphism is anautomorphism. Moreover, it is shown that the invertibility of the determinant of the Jacobian matrix of an automorphismimplies its wildness.
Study Of Avian Migration Patterns Using Stable Isotope Analysis In The Galite Archipelago, Tunisia, Hsan Ben Jemaa, Said Nouira, François Fourel, Ilham Bentaleb
Study Of Avian Migration Patterns Using Stable Isotope Analysis In The Galite Archipelago, Tunisia, Hsan Ben Jemaa, Said Nouira, François Fourel, Ilham Bentaleb
Turkish Journal of Zoology
This research employed stable isotope analysis to investigate the migratory patterns and geographic origins of the Eleonora's falcon (Falco eleonorae) and its associated prey species within the Galite Archipelago, Tunisia. Feathers collected from both juvenile and adult falcons, along with their prey, were analysed for deuterium isotopic composition using the "Isorix" package in R, which facilitated the geographic assignment based on stable isotope ratios. The results demonstrated no significant difference in deuterium values (δ2H) between adult and juvenile falcons, indicating a lack of geographical variation in moulting locations among the different age groups. However, the isotopic data for adult falcons …
Biosorption Of Ni (Ii), Pb (Ii) And Cu (Ii) Metal Ions On The Chitin Isolated From Spider Species Of Drassodes Lapidosus, Albulene Emini, Osman Seyyar, Yavuz Sürme
Biosorption Of Ni (Ii), Pb (Ii) And Cu (Ii) Metal Ions On The Chitin Isolated From Spider Species Of Drassodes Lapidosus, Albulene Emini, Osman Seyyar, Yavuz Sürme
Turkish Journal of Zoology
This study evaluates the biosorption ability of chitin derived from a specific spider species namely Drassodes lapidosus (Walckenaer, 1802) belongs to Gnaphosidae family. The obtained chitin was characterized by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analysis. In the alpha form of the obtained chitin, its thermal stability was observed to be 356.9 ℃ and, the Crl value was 69.16%. In addition, this chitin was used as a bioadsorbent to remove heavy metal ions such as Ni (II), Cu (II) and Pb (II) from the aqueous medium by solid phase extraction …
Effects Of Microplastics On Aquatic Organisms: A Comprehensive Review, Sedat Gündoğdu, İrem Nur Yeşi̇lyurt, Zohaib Abbas, Makbule Baylan
Effects Of Microplastics On Aquatic Organisms: A Comprehensive Review, Sedat Gündoğdu, İrem Nur Yeşi̇lyurt, Zohaib Abbas, Makbule Baylan
Turkish Journal of Zoology
Microplastics (MPs) are pervasive pollutants that pose significant threats to marine ecosystems. This review examines the impact of MPs on marine organisms, highlighting key areas of concern and knowledge gaps.The aim of this paper is to synthesize recent findings on the occurrence and biological impacts of MPs in marine environments. For this purpose a total of 171 studies conducted in different geographical regions were examined in order to ascertain the interaction of numerous vertebrate and invertebrate taxonomic groups with microplastic. Based on this analysis the pathways through which MPs enter marine ecosystems and their interactions with marine organisms were examined. …
Morphometric And Meristic Differentiation Among Five Populations Of Delminichthys Ghetaldii (Actinopterygii, Cyprinidae) From Five Karst Fields In Eastern Herzegovina, Dušanka Berak Čihorić, Ana Marić, Danilo Mrdak, Predrag Simonović
Morphometric And Meristic Differentiation Among Five Populations Of Delminichthys Ghetaldii (Actinopterygii, Cyprinidae) From Five Karst Fields In Eastern Herzegovina, Dušanka Berak Čihorić, Ana Marić, Danilo Mrdak, Predrag Simonović
Turkish Journal of Zoology
The primary objectives of this study were to advance our understanding of the morphological intricacies exhibited by the endemic fish species, Delminichthys ghetaldii, commonly known as the Trebinje minnow, and to determine intraspecific morphological variability. The study involved the examination of 76 mature specimens collected from five distinct karst fields located within the Dinaric region of Eastern Herzegovina, Bosnia and Herzegovina, since the year 2018. A comprehensive analysis of 22 morphometric and 8 meristic characters was conducted to unravel the underlying patterns of variation. Discriminant Function Analysis was employed for the thorough investigation of morphometric traits, whereas Canonical Correspondence Analysis …
Dietary Observations Of Adult Pleurodema Nebulosum (Anura: Leptodactylidae) From Argentina, Gabriel Natalio Castillo, Cynthia J. González- Rivas
Dietary Observations Of Adult Pleurodema Nebulosum (Anura: Leptodactylidae) From Argentina, Gabriel Natalio Castillo, Cynthia J. González- Rivas
Turkish Journal of Zoology
This study is the first to examine the diet composition of adult Pleurodema nebulosum specimens based on an analysis of the gastrointestinal contents of 78 individuals. Analyzed herein were 40 specimens from a site disturbed due to anthropogenic action and 38 from a protected area in Argentina. Differences were found in the trophic consumption at both sites. In the protected area, P. nebulosum presented an active foraging mode, with a diet specialized in prey items from the Formicidae family. At the disturbed site, this amphibian showed a sit-and-wait foraging mode, with a generalist diet where it consumes Hemiptera and Coleoptera. …
The Frequency Of Potentially Inappropriate Medication Usage In Community-Dwelling Oldest-Old People, Fuat Ni̇hat Özaydin
The Frequency Of Potentially Inappropriate Medication Usage In Community-Dwelling Oldest-Old People, Fuat Ni̇hat Özaydin
Turkish Journal of Medical Sciences
Background/aim: It is critically important to protect the health of the oldest-old people, as their hospitalization and death rates are high. The objective of this study was to analyze the prevalence of potentially inappropriate medication use among the community-dwelling oldest-old people and its association with their demographic characteristics. Materials and methods: Data were collected from real-world settings using the observational method for this descriptive study. An older adult aged ≥ 85 years old was defined as the oldest-old. The participants were visited in their homes. The generic names of the medications used, and the age, sex, and province of residence …
Relationships Between Stenosis Severity, Functional Limitation, Pain, And Quality Of Life In Patients With Cervical Spondylotic Radiculopathy, Aydin Si̇nan Apaydin, Musa Güneş
Relationships Between Stenosis Severity, Functional Limitation, Pain, And Quality Of Life In Patients With Cervical Spondylotic Radiculopathy, Aydin Si̇nan Apaydin, Musa Güneş
Turkish Journal of Medical Sciences
Background/aimThis study aims to examine the relationship between severity of stenosis, pain, functional limitation, disability, and quality of life in patients with cervical spondylotic radiculopathy.Materials and methodsPatients (45 female, 19 male) with radiculopathy due to spondylotic changes in the cervical spine were included in the study. Stenosis severity (thecal sac cross-sectional area (CSA)), numbness, neck, and arm pain severity, functional limitation (Cervical radiculopathy impact scale), disability, and quality of life (EuroQol (EQ) five-dimensions-3-level general quality of life scale) were evaluated. ClinicalTrial number: NCT06001359ResultsAccording to CSA, 28 (43.75%) patients had severe stenosis, 36 (56.25%) had moderate stenosis, and the average CSA …
Use Of Intraoperative Microvascular Doppler During Subinguinal Microsurgical Varicocelectomy In Children Reduces Complications, Cem Kaya, Si̇bel Eryilmaz, Alparslan Kapisiz, Ali̇ Atan, Ramazan Karabulut, Zafer Türkyilmaz, Kaan Sönmez
Use Of Intraoperative Microvascular Doppler During Subinguinal Microsurgical Varicocelectomy In Children Reduces Complications, Cem Kaya, Si̇bel Eryilmaz, Alparslan Kapisiz, Ali̇ Atan, Ramazan Karabulut, Zafer Türkyilmaz, Kaan Sönmez
Turkish Journal of Medical Sciences
Background /aim: to assess the impact of microvascular Doppler ultrasonography (MDU) used intraoperatively during children's microsurgical subinguinal varicocele correction.Materials and methods: Nineteen patients who received intraoperative MDU during subinguinal microsurgical varicocelectomy between 2021 and 2023 were included in this study. The patients' age, varicocele side, clinical examinations, preoperative US results, intraoperative findings, spermatic artery counts and findings regarding the use of MDU, postoperative complications, and results were evaluated.Results: All varicoceles were on the left side and the average age was 15.2 years. The indications of varococelectomy were testicular hypotrophy(n=10) and scrotal pain or fullness(n=9). Under the surgical microscope, testicular artery …
Evaluation Of Volume Measurements Of Neuroanatomical Structures Related To Speech In Multiple Sclerosis Patients, Hidir Pekmez, Anil Altiparmak, Feyza İnceoğlu, Mehmet Akçi̇çek, Asli Bolayir, Zeynep Özbay, Merve Aydin, Muhammed Furkan Arpaci
Evaluation Of Volume Measurements Of Neuroanatomical Structures Related To Speech In Multiple Sclerosis Patients, Hidir Pekmez, Anil Altiparmak, Feyza İnceoğlu, Mehmet Akçi̇çek, Asli Bolayir, Zeynep Özbay, Merve Aydin, Muhammed Furkan Arpaci
Turkish Journal of Medical Sciences
Background/aim: Individuals with multiple sclerosis (MS) may experience various speech-related issues, including decreased speech rate, increased pauses, and changes in speech rhythms. The purpose of this study was to compare the volumes of speech-related neuroanatomical structures in MS patients with those in a control group.Materials and methods: The research was conducted in the Neurology and Radiology Departments of Malatya Training and Research Hospital. The records of patients who presented to the Neurology Department between 2019 and 2022 were examined. The study included the magnetic resonance imaging (MRI) findings of 100 individuals, with 50 in the control group and 50 patients …
The Effect Of Wet Cupping Therapy On The Clinical Symptoms Of Adult-Onset Asthma: A Randomized Clinical Trial, Abbas Joushan, Hamid Reza Hatami, Khosrow Agin, Hoorieh Mohammadi Kenari, Sajjad Sadeghi, Rasool Choopani
The Effect Of Wet Cupping Therapy On The Clinical Symptoms Of Adult-Onset Asthma: A Randomized Clinical Trial, Abbas Joushan, Hamid Reza Hatami, Khosrow Agin, Hoorieh Mohammadi Kenari, Sajjad Sadeghi, Rasool Choopani
Turkish Journal of Medical Sciences
Background/aim: Asthma is an inflammatory disease of the lungs. Cupping therapy is a traditional method used in Persian medicine for treating various ailments. This study aimed to evaluate the anti-asthmatic effects of wet cupping therapy (WCT) in patients with mild to moderate asthma. Materials and methods: This is a randomized clinical trial conducted on 103 asthma patients who were referred to Loghman Hakim Hospital, Tehran, Iran. The diagnosis of the disease was confirmed by a pulmonologist based on the patient’s history and clinical examinations. The patients who were treated with common asthma medications were assigned to intervention and control groups. …
Exploring The Impact Of Diabetes On Aging: Insights From Tert And Col1a1 Methylation, Jessica Nathania Liamry, Farizky Martriano Humardani, Giovani Chandra, Lisa Thalia Mulyanata, Tjie Kok, Fenny Irawati, Hikmawan Wahyu Sulistomo, Christoph Reichetzeder, Sulistyo Emantoko Dwi Putra
Exploring The Impact Of Diabetes On Aging: Insights From Tert And Col1a1 Methylation, Jessica Nathania Liamry, Farizky Martriano Humardani, Giovani Chandra, Lisa Thalia Mulyanata, Tjie Kok, Fenny Irawati, Hikmawan Wahyu Sulistomo, Christoph Reichetzeder, Sulistyo Emantoko Dwi Putra
Turkish Journal of Biology
Background/aim: Aging, a multifaceted biological process, leading to diminished physical performance, especially in older adults with diabetes, where a mismatch between biological and chronological age is noticeable. Numerous studies have demonstrated that diabetes accelerates aging at both cellular and organ levels. Notable aging markers are TERT, related to telomere length, and COL1A1, a key component of skin collagen. Additionally, age-related methylation increases, as revealed through methylation analysis, illuminate aspects of aging. However, the detailed interplay between aging and diabetes, particularly regarding methylation, remains underexplored and warrants further study to elucidate their biological links.Materials and methods: In this research, we elucidate …
Distal Interphalangeal Joint Involvement In Patients With Rheumatoid Arthritis: Where Are We?, Mete Pekdi̇ker, Sertaç Ketenci̇, Gökhan Sargin
Distal Interphalangeal Joint Involvement In Patients With Rheumatoid Arthritis: Where Are We?, Mete Pekdi̇ker, Sertaç Ketenci̇, Gökhan Sargin
Turkish Journal of Medical Sciences
Background/aim: Rheumatoid arthritis (RA) usually affects the wrist, metacarpophalangeal joint, and proximal interphalangeal joint of the hands. However, the distal interphalangeal (DIP) joints may also be involved in RA patients. In this study, we aimed to evaluate the frequency and associated factors of DIP joint erosion in patients with RA.Materials and methods: Medical records of patients with RA were reviewed retrospectively. Patients with major trauma affecting DIP joints, osteoarthritis, erosive osteoarthritis, psoriatic arthritis, systemic sclerosis, calcium pyrophosphate dihydrate disease, and gout were excluded. Anteroposterior hand X-rays were evaluated and patients were divided into groups according to autoantibody profile.Results: We reviewed …
Chlorogenic Acid Ameliorates Memory Dysfunction Via Attenuating Frontal Lobe Oxidative Stress And Apoptosis In Diabetic Rat Model, Ramedhea Laila Afifa An Nur Willya Saputri, Nur Arfian, Junaedy Yunus, Fauziyatul Munawaroh, Sagita Mega Sekar Kencana, Dwi Cayhani Ratna Sari
Chlorogenic Acid Ameliorates Memory Dysfunction Via Attenuating Frontal Lobe Oxidative Stress And Apoptosis In Diabetic Rat Model, Ramedhea Laila Afifa An Nur Willya Saputri, Nur Arfian, Junaedy Yunus, Fauziyatul Munawaroh, Sagita Mega Sekar Kencana, Dwi Cayhani Ratna Sari
Turkish Journal of Medical Sciences
Background/aim: Diabetes mellitus, characterized by hyperglycemia, causes various complications, one of which is memory dysfunction. The frontal lobe is known to be responsible for impaired memory function due to hyperglycemia and is associated with oxidative stressmediated neuronal cell apoptosis. Chlorogenic acid (CGA) is reported to have neuroprotective effects. However, its effect on the frontal lobe in diabetes mellitus (DM) rats is not widely known. This research aimed to elucidate the effect of CGA on the mRNA expressions of SOD1, SOD2, p53, and Bcl-2 in the frontal lobe of DM rats. Materials and methods: Thirty male Wistar rats (2-month-old, 150–200 gBW) …
Spinal Stabilization Exercises For Transversus Abdominis And Lumbar Multifidus Thickness Via Telerehabilitation And Face-To-Face Approaches In Patients With Nonspecific Chronic Neck Pain: A Randomized Controlled Trial, Di̇lara Onan, Erkan Demi̇rci̇, Egemen Turhan, Özlem Ülger
Spinal Stabilization Exercises For Transversus Abdominis And Lumbar Multifidus Thickness Via Telerehabilitation And Face-To-Face Approaches In Patients With Nonspecific Chronic Neck Pain: A Randomized Controlled Trial, Di̇lara Onan, Erkan Demi̇rci̇, Egemen Turhan, Özlem Ülger
Turkish Journal of Medical Sciences
Background/aim: Strengthening the muscles of the lumbar region in individuals with neck pain may be protective against future back problems. In addition, telerehabilitation applications, which gained momentum in the literature and clinical practice during the COVID-19 pandemic, are among the applications preferred by patients thanks to their various advantages. This study aimed to compare the effects of telerehabilitation and spinal stabilization exercises applied with face-to-face approaches on the thickness of the transversus abdominis (M.TrA) and lumbar multifidus (M.LM) muscles in patients with nonspecific neck pain.Materials and methods: The primary outcomes were the thickness of the M.TrA and M.LM. Neck pain …
Relationship Between Functional Status And Fatigue After Covid-19 Infection: A Multicenter Study From Türkiye, İpek Candemi̇r, Pinar Ergün, Di̇cle Kaymaz, Mustafa Engi̇n Şahi̇n, İpek Özmen, Eli̇f Yildirim, Asli Görek Di̇lektaşli, Büşra Yi̇ği̇tli̇ler, Ayten Odabaş, Deni̇z Kizilirmak, Seçi̇l Sari, Celaletti̇n Korkmaz, Cantürk Taşçi, Yakup Arslan, Sema Savci, Buse Kahraman, Ayli̇n Tanriverdi̇, Can Sevi̇nç, Melda Sağlam, Deni̇z İnal İnce, Naci̇ye Vardar Yağli, Ebru Kütükçü, Di̇lber Durmaz, Nesli̇han Durutürk, Gaye Ulubay, Lütfi̇ye Kiliç, Benan Çağlayan, Ayli̇n Moray, Sabri̇ Serhan Olcay, Güven Özkaya
Relationship Between Functional Status And Fatigue After Covid-19 Infection: A Multicenter Study From Türkiye, İpek Candemi̇r, Pinar Ergün, Di̇cle Kaymaz, Mustafa Engi̇n Şahi̇n, İpek Özmen, Eli̇f Yildirim, Asli Görek Di̇lektaşli, Büşra Yi̇ği̇tli̇ler, Ayten Odabaş, Deni̇z Kizilirmak, Seçi̇l Sari, Celaletti̇n Korkmaz, Cantürk Taşçi, Yakup Arslan, Sema Savci, Buse Kahraman, Ayli̇n Tanriverdi̇, Can Sevi̇nç, Melda Sağlam, Deni̇z İnal İnce, Naci̇ye Vardar Yağli, Ebru Kütükçü, Di̇lber Durmaz, Nesli̇han Durutürk, Gaye Ulubay, Lütfi̇ye Kiliç, Benan Çağlayan, Ayli̇n Moray, Sabri̇ Serhan Olcay, Güven Özkaya
Turkish Journal of Medical Sciences
Background/aim: Symptoms of COVID-19 may persist for months. One of the persistent symptoms of COVID-19 is fatigue, which reduces functional status. The relationship between fatigue, functional status, and various other factors has received little attention, which this study aims to address.. Materials and methods: Patients with COVID-19 infection were included in this multicenter cross-sectional study. Age, sex, body mass index (BMI), marital status, smoking status, presence and duration of chronic disease, comorbidity index, regular exercise habits, time since COVID-19 diagnosis, hospitalization status, length of hospital stay, intubation status, home oxygen therapy after discharge, participation in a pulmonary rehabilitation program, presence …
Preparation Of A Chiral Hyperbranched Polymer Based On Cinchona Alkaloids And Investigation Of Its Catalytic Activity In Asymmetric Reactions, Rafiqul Islam, Mohammad Shahid Ullah, Abdus Salam, Shinichi Itsuno
Preparation Of A Chiral Hyperbranched Polymer Based On Cinchona Alkaloids And Investigation Of Its Catalytic Activity In Asymmetric Reactions, Rafiqul Islam, Mohammad Shahid Ullah, Abdus Salam, Shinichi Itsuno
Turkish Journal of Chemistry
Cinchona alkaloid-derived sulfonamides and ester dimers containing chiral hyperbranched polymers have been successfully synthesized and applied as catalysts in asymmetric reactions. Several hyperbranched polymers derived from cinchona alkaloids, incorporating sulfonamides and esters, were synthesized through Mizoroki–Heck coupling polymerization. These polymers were subsequently applied in enantioselective Michael addition reactions. As the prepared polymers are not soluble in frequently used organic solvents, they act as efficient catalysts in the enantioselective reaction of β-ketoesters to nitroolefins, achieving up to 99% enantioselectivity with good yields. The insoluble property allows them to better satisfy “green chemistry” requirements and be used several times without losing the …
Synthesis, Characterization, And Physico-Chemical Aspects Of A New Pvc-Based Quaternary Triethanol Ammonium Chloride Anionite For Tungsten Recovery, Bahig Atia
Turkish Journal of Chemistry
The usability of polyvinyl chloride-based quaternary triethanol ammonium chloride anionite (PVC-TEAC) as a potential extractant for tungstate was investigated to recover tungstate from Gabal Qash Amir, Egypt, assaying 70.91% WO3. Structure elucidation for PVC-TEAC anionite was successfully carried out using several techniques. Experimental measurements, such as pH, agitation time, initial tungsten concentration, anionite dose, co-ions, temperature, and eluting agents, have been optimized. It was found that PVC-TEAC anionite has a maximum capacity of 63 mg per gram. From the distribution isotherm modeling, Langmuir’s model fits the experimental results better than Freundlich’s, with a theoretical value of 61.728 mg g–1. According …
Exploring The Efficiency Of Nitrogenated Carbon Quantum Dots/Tio2 S-Scheme Heterojunction In Photodegradation Of Ciprofloxacin In Aqueous Environments, Yilmaz Ateş, Zafer Eroğlu, Özkan Açişli, Önder Meti̇n, Semra Karaca
Exploring The Efficiency Of Nitrogenated Carbon Quantum Dots/Tio2 S-Scheme Heterojunction In Photodegradation Of Ciprofloxacin In Aqueous Environments, Yilmaz Ateş, Zafer Eroğlu, Özkan Açişli, Önder Meti̇n, Semra Karaca
Turkish Journal of Chemistry
The usability of polyvinyl chloride-based quaternary triethanol ammonium chloride anionite (PVC-TEAC) as a potential extractant for tungstate was investigated to recover tungstate from Gabal Qash Amir, Egypt, assaying 70.91% WO3. Structure elucidation for PVC-TEAC anionite was successfully carried out using several techniques. Experimental measurements, such as pH, agitation time, initial tungsten concentration, anionite dose, co-ions, temperature, and eluting agents, have been optimized. It was found that PVC-TEAC anionite has a maximum capacity of 63 mg per gram. From the distribution isotherm modeling, Langmuir’s model fits the experimental results better than Freundlich’s, with a theoretical value of 61.728 mg g–1. According …
Liquefaction Optimization Of Grape Pulp Using Response Surface Methodology For Biopolyol Production And Bio-Based Polyurethane Foam Synthesis, Furkan Çolakoğlu, Emre Akdoğan, Murat Erdem
Liquefaction Optimization Of Grape Pulp Using Response Surface Methodology For Biopolyol Production And Bio-Based Polyurethane Foam Synthesis, Furkan Çolakoğlu, Emre Akdoğan, Murat Erdem
Turkish Journal of Chemistry
Both environmental and economic disadvantages of using petroleum-based products have been forcing researchers to work on environmentally friendly, sustainable, and economical alternatives. The purpose of this study is to optimize the solvothermal liquefaction process of grape pomace using response surface methodology coupled with a central composite design. After investigating the physicochemical properties of the liquified products (biopolyol) in detail, a bio-based rigid polyurethane foam (RPUF) was synthesized and characterized. The hydroxyl and acid numbers and viscosity values of all the biopolyols were analyzed. According to variance analysis results (%95 confidence range), both the reaction temperature and catalyst loading were determined …
New Imidazolidindionedioximes And Their Pt(Ii) Complexes: Synthesis And Investigation Of Their Antitumoral Activities On Breast Cancer Cells, Emrah Karahan, Tuğba Gençoğlu Katmerli̇kaya, Emel Önal, Aydan Dağ, Ayşe Gül Gürek, Vefa Ahsen
New Imidazolidindionedioximes And Their Pt(Ii) Complexes: Synthesis And Investigation Of Their Antitumoral Activities On Breast Cancer Cells, Emrah Karahan, Tuğba Gençoğlu Katmerli̇kaya, Emel Önal, Aydan Dağ, Ayşe Gül Gürek, Vefa Ahsen
Turkish Journal of Chemistry
Breast cancer is one of the most common types of cancer worldwide and has the most lethality ratio for females among all cancers. Although current cancer therapeutics have made considerable advancements, there is still room for improvement in terms of efficacy. Many anticancer drugs have a risk of causing serious adverse effects due to their non-specific cytotoxic effects on both tumor and healthy cells. New therapeutics might have a greater ability to kill cancer cells, reduce the volume of tumors, and improve overall therapy response rates. Herein, we report the efficient synthesis and characterization of three amphi vic-dioximes and their …
Synthesis Of 3-Methyl-3-Buten-1-Ol By Supercritical Co2 In Coordination With Hzsm-5 Catalyzed Formaldehyde-Isobutene Prins Reaction, Hang Yuan, Gui-Ping Cao, Hui Lv
Synthesis Of 3-Methyl-3-Buten-1-Ol By Supercritical Co2 In Coordination With Hzsm-5 Catalyzed Formaldehyde-Isobutene Prins Reaction, Hang Yuan, Gui-Ping Cao, Hui Lv
Turkish Journal of Chemistry
The reaction solvent and catalyst play an essential role in the Prins reaction for the synthesis of 3-methyl-3-buten-1-ol (MBO) from formaldehyde and isobutene. The reactivity of the solid base catalyzed Prins condensation reaction by formaldehyde and isobutene in supercritical CO2 was investigated using CsH2PO4 modified HZSM-5. We finds that the alkaline sites of the alkali-loaded catalyst can extract the α-H on isobutene to generate olefin carbon negative ions, while the supercritical CO2 with weak Lewis acidity can activate formaldehyde to carbon positive ions, which can combine more easily with the carbon negative isobutene to react, thus improving the reactivity of …
Magnetic Solid-Phase Extraction Technique Based On Fe3o4@Coppy-Pth Nanocomposite For Extraction Of Cobalt, Chromium, And Nickel Prior To Determination By Micro-Sample Injection System-Flame Atomic Absorption Spectrometry In Alcoholic And Nonalcoholic Beverages, Meli̇ke Küçüksakalli, Qamar Salamat, Buket Ti̇reli̇, Şükrü Gökhan Elçi̇
Magnetic Solid-Phase Extraction Technique Based On Fe3o4@Coppy-Pth Nanocomposite For Extraction Of Cobalt, Chromium, And Nickel Prior To Determination By Micro-Sample Injection System-Flame Atomic Absorption Spectrometry In Alcoholic And Nonalcoholic Beverages, Meli̇ke Küçüksakalli, Qamar Salamat, Buket Ti̇reli̇, Şükrü Gökhan Elçi̇
Turkish Journal of Chemistry
A novel Fe3O4@coPPy-PTH nanocomposite-based sorbent was prepared via in-situ oxidative polymerization using Fe3O4 nanoparticles with spherical and flower-like morphologies of thiophene and pyrrole as the feedstocks. The synthesized nanocomposite utilized sensitive extraction and determination of the metal ions Co(II), Cr(III), and Ni(II) without a chelating agent, followed by a micro-sample injection system-flame atomic absorption spectrometer (MIS-FAAS). The composition and morphology of Fe3O4@coPPy-PTH nanocomposite were characterized by advanced spectroscopic and imaging techniques like SEM and FT-IR. SEM observations showed the size of Fe3O4 nanoparticles changed from 30 nm to 120 nm in diameter after the copolymer (PPy-PTH) coating. The Fe3O4@coPPy-PTH nanocomposite …
Β-Ketoenamine-Linked Covalent Organic Framework For Efficient Iodine Capture, Onur Büyükçakir
Β-Ketoenamine-Linked Covalent Organic Framework For Efficient Iodine Capture, Onur Büyükçakir
Turkish Journal of Chemistry
Exploring the materials that effectively capture radioactive iodine is crucial in managing nuclear waste produced from nuclear power plants. Herein, a β-ketoenamine-linked covalent organic framework (bCOF) was reported as an effective adsorbent to capture iodine from both vapor and solution. bCOF's high porosity and heteroatom-rich skeleton offer a notable iodine vapor uptake capacity of up to 2.51 g g-1 at 75 oC under ambient pressure. Furthermore, after five consecutive adsorption-desorption cycles, the bCOF demonstrates a high reusability performance with a significant iodine vapor capacity retention. The adsorption mechanism was also investigated using various ex-situ structural characterization techniques, and these mechanistic …
Lacoo3 Is A Promising Catalyst For Dry Reforming Of Benzene Used As A Surrogate Of Biomass Tar, Başar Çağlar, Deni̇z Üner
Lacoo3 Is A Promising Catalyst For Dry Reforming Of Benzene Used As A Surrogate Of Biomass Tar, Başar Çağlar, Deni̇z Üner
Turkish Journal of Chemistry
Tar build-up is one of the bottlenecks of biomass gasification process. Dry reforming of tar is an alternative solution if oxygen chemical potential on the catalyst surface is at sufficient levels. For this purpose, an oxygen donor perovskite, LaCoO3, was used as a catalyst for dry reforming of tar. To circumvent the complexity of the tar and its constituents, benzene molecule was chosen as a model compound. Dry reforming of benzene vapour on the LaCoO3 catalyst was investigated at temperatures of 600, 700, 800 °C, at the CO2/C6H6 ratios of 3, 6, 12 and at space velocities of 14000 and …
Synthesis And Characterization Of New Hexahydroquinoline Derivatives, Evaluation Of Their Cytotoxicity, Intracellular Ros Production And Inhibitory Effects On Inflammatory Mediators, Ezgi̇ Pehli̇vanlar, Deni̇z Arca Çakir, Sonia Sanajou, Hülya Tezel Yalçin, Terken Baydar, Pinar Erkekoğlu, Hani̇fe Avci, Rahi̇me Şi̇mşek
Synthesis And Characterization Of New Hexahydroquinoline Derivatives, Evaluation Of Their Cytotoxicity, Intracellular Ros Production And Inhibitory Effects On Inflammatory Mediators, Ezgi̇ Pehli̇vanlar, Deni̇z Arca Çakir, Sonia Sanajou, Hülya Tezel Yalçin, Terken Baydar, Pinar Erkekoğlu, Hani̇fe Avci, Rahi̇me Şi̇mşek
Turkish Journal of Chemistry
Inflammation is a response to injury and infection in the organism. It can be categorized as acute and chronic inflammation. Chronic inflammation is the underlying cause of many diseases such as Alzheimer's, diabetes, rheumatoid arthritis, atherosclerosis and cardiovascular diseases. Recent studies have proven the anti-inflammatory properties of 1,4-dihydropyridines (1,4-DHPs) and its derivatives, which have many biological properties including calcium channel blockers. The structures of the synthesized compounds were elucidated by IR, 1H-NMR, 13C-NMR and HRMS methods. The cytotoxic properties of the compounds were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method in 3T3 cell line. Among the 15 compounds, the three compounds …