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2022

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Mechanical And Wetting Properties Of Coated Paper Sheets With Varying Polydimethylsiloxane Molecular Masses In The Coating Formulation, Çağla Söz Jan 2022

Mechanical And Wetting Properties Of Coated Paper Sheets With Varying Polydimethylsiloxane Molecular Masses In The Coating Formulation, Çağla Söz

Turkish Journal of Chemistry

Coated paper sheets were prepared by immobilizing a thin coating layer of cross-linked polydimethylsiloxane (PDMS) and inorganic particles onto Whatman filter paper Grade 1 (WFP) substrates. Several coatings that differed in terms of their PDMS molecular masses were sprayed onto WFP substrates to investigate the effect of this variation on the (i) wettability and (ii) mechanical properties of the samples. Different samples having clay or silica particles in the coating formulation were investigated separately. Nonwettable coated paper sheets with promising mechanical properties were achieved and further investigated in terms of (iii) thermal resistance.

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Synthesis Of Benzoyl Hydrazones Having 4-Hydroxy-3,5-Dimethoxy Phenyl Ring, Theirbiological Activities, And Molecular Modeling Studies On Enzyme Inhibition Activities, Bedri̇ye Seda Kurşun Aktar, Yusuf Sicak, Gi̇zem Tatar, Emi̇ne Elçi̇n Emre Jan 2022

Synthesis Of Benzoyl Hydrazones Having 4-Hydroxy-3,5-Dimethoxy Phenyl Ring, Theirbiological Activities, And Molecular Modeling Studies On Enzyme Inhibition Activities, Bedri̇ye Seda Kurşun Aktar, Yusuf Sicak, Gi̇zem Tatar, Emi̇ne Elçi̇n Emre

Turkish Journal of Chemistry

Hydrazone compounds have high capacity in terms of antioxidant activity and enzyme inhibition activities such as anticholinesterase, tyrosinase, and urease. In this study, benzoyl hydrazones compounds (7a-7m) were synthesized starting from 3,5-dimethoxy-4-hydroxybenzaldehyde. Antioxidant activity of the synthesized compounds was evaluated. In the β-carotene-linoleic acid and ABTS cation radical scavenging activities, compounds 7j, 7e, and 7m stood out as the most active compounds, respectively. In the anticholinesterase enzyme inhibition activity results, compound 7f exhibited the best activity against AChE and BChE enzymes in the synthesis series. In addition, molecular docking analysis was performed to understand the inhibition mechanism of the synthesized …

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Drivers Of Environmental Degradation In Turkey: Designing An Sdg Framework Through Advanced Quantile Approaches, Tomiwa Sunday Adebayo, Ephraim Bonah Agyekum, Salah Kamel, Hossam Zawbaa, Mehmet Altuntaş Jan 2022

Drivers Of Environmental Degradation In Turkey: Designing An Sdg Framework Through Advanced Quantile Approaches, Tomiwa Sunday Adebayo, Ephraim Bonah Agyekum, Salah Kamel, Hossam Zawbaa, Mehmet Altuntaş

Articles

Turkey is a laggard in terms of the achievement of its Sustainable Development Goals (SDGs), and one of the primary issues it faces is environmental deterioration. Therefore, a policy-level reorientation may be needed to address this relevant issue. From this standpoint, this research assesses the impact of renewable energy (RE) use and financial development on the emissions of CO2 as well as the role of urbanization and agriculture, utilizing a dataset stretching between 1985 and 2019. By applying the innovative quantile-on-quantile regression (QQR) and non-parametric Granger causality in quantiles techniques, the study assesses the ways in which the quantiles of …

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Image-Based Malware Classification Hybrid Framework Based On Space-Filling Curves, Stephen O Shaughnessy, Stephen Sheridan Jan 2022

Image-Based Malware Classification Hybrid Framework Based On Space-Filling Curves, Stephen O Shaughnessy, Stephen Sheridan

Articles

There exists a never-ending “arms race” between malware analysts and adversarial malicious code developers as malevolent programs evolve and countermeasures are developed to detect and eradicate them. Malware has become more complex in its intent and capabilities over time, which has prompted the need for constant improvement in detection and defence methods. Of particular concern are the anti-analysis obfuscation techniques, such as packing and encryption, that are employed by malware developers to evade detection and thwart the analysis process. In such cases, malware is generally impervious to basic analysis methods and so analysts must use more invasive techniques to extract …

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Adopting Scenario-Based Approach To Solve Optimal Reactive Power Dispatch Problem With Integration Of Wind And Solar Energy Using Improved Marine Predator Algorithm, Noor Habib Khan, Raheela Jamal, Mohamed Ebeed, Salah Kamel, Hamed Zeinoddini-Meymand, Hossam Zawbaa Jan 2022

Adopting Scenario-Based Approach To Solve Optimal Reactive Power Dispatch Problem With Integration Of Wind And Solar Energy Using Improved Marine Predator Algorithm, Noor Habib Khan, Raheela Jamal, Mohamed Ebeed, Salah Kamel, Hamed Zeinoddini-Meymand, Hossam Zawbaa

Articles

The penetration of renewable energy resources into electric power networks has been increased considerably to reduce the dependence of conventional energy resources, reducing the generation cost and greenhouse emissions. The wind and photovoltaic (PV) based systems are the most applied technologies in electrical systems compared to other technologies of renewable energy resources. However, there are some complications and challenges to incorporating these resources due to their stochastic nature, intermittency, and variability of output powers. Therefore, solving the optimal reactive power dispatch (ORPD) problem with considering the uncertainties of renewable energy resources is a challenging task. Application of the Marine Predators …

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Effect Of Cryogenic Treatment On Drill Tool For Enhancing Metal Cutting Operation Of Aluminium Alloy Is737.Gr19000, G. Navaneethakrishnan, B. Sureshkumar, R. Palanisamy, Mohit Bajaj, Hossam Zawbaa, Salah Kamel Jan 2022

Effect Of Cryogenic Treatment On Drill Tool For Enhancing Metal Cutting Operation Of Aluminium Alloy Is737.Gr19000, G. Navaneethakrishnan, B. Sureshkumar, R. Palanisamy, Mohit Bajaj, Hossam Zawbaa, Salah Kamel

Articles

Drilling is the hole making process on the component face with the aid of a twisted drillbit. Normal drill bits easily wear out through penetration of drill bit into the workpiece material due to force generated in the drilling operation. So this work tries to investigate the machining parameters with cryogenically treated drill bits on various responses. Cryogenic treatment is one of the thermal engineering processes, which is used to cool the material from the temperature of −150 °C to −273 °C. This research work utilizes cryogenically treated drill tools for investigating the drilling performance on aluminium alloy (IS737.Gr19000) workpiece …

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Does Information And Communication Technology Impede Environmental Degradation? Fresh Insights From Non-Parametric Approaches, Tomiwa Sunday Adebayo, Ephraim Bonah Agyekum, Mehmet Altuntas, Sadriddin Khudoyqulov, Hossam Zawbaa, Salah Kamel Jan 2022

Does Information And Communication Technology Impede Environmental Degradation? Fresh Insights From Non-Parametric Approaches, Tomiwa Sunday Adebayo, Ephraim Bonah Agyekum, Mehmet Altuntas, Sadriddin Khudoyqulov, Hossam Zawbaa, Salah Kamel

Articles

Although ICT has played a critical role in the socio-economic growth of human cultures, it has also brought with it significant environmental risks. Nevertheless, scholars remain divided on this topic; some believe that ICT has had a positive influence on the quality of the environment, while others believe that ICT has created major environmental issues. Hence, this research is another effort to assess the effects of ICT on CO2 emissions in the top 10 ICT nations (Denmark, Japan, Luxemburg, South Korea, Netherlands, Iceland, Norway, Sweden, Switzerland, and the United Kingdom) using a dataset from the period between 1986Q1 and 2019Q4. …

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Automated Extraction Of Genes Associated With Antibiotic Resistance From The Biomedical Literature, Andre Brincat, Markus Hofmann Jan 2022

Automated Extraction Of Genes Associated With Antibiotic Resistance From The Biomedical Literature, Andre Brincat, Markus Hofmann

Articles

The detection of bacterial antibiotic resistance phenotypes is important when carrying out clinical decisions for patient treatment. Conventional phenotypic testing involves culturing bacteria which requires a significant amount of time and work. Whole-genome sequencing is emerging as a fast alternative to resistance prediction, by considering the presence/absence of certain genes. A lot of research has focused on determining which bacterial genes cause antibiotic resistance and efforts are being made to consolidate these facts in knowledge bases (KBs). KBs are usually manually curated by domain experts to be of the highest quality. However, this limits the pace at which new facts …

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The Investigation Of Fluorescence And Metal Interaction Properties Of Racemic 7,8,9,10-Tetrahydro-3-Hydroxy-4-(1-Hydroxyethyl)Benzo[C]Chromen-6-One, Hayretti̇n Ozan Gülcan, Kharar Tawfeeq Shukur, Açelya Mavi̇deni̇z, Okan Si̇rkeci̇oğlu, Mustafa Gazi̇ Jan 2022

The Investigation Of Fluorescence And Metal Interaction Properties Of Racemic 7,8,9,10-Tetrahydro-3-Hydroxy-4-(1-Hydroxyethyl)Benzo[C]Chromen-6-One, Hayretti̇n Ozan Gülcan, Kharar Tawfeeq Shukur, Açelya Mavi̇deni̇z, Okan Si̇rkeci̇oğlu, Mustafa Gazi̇

Turkish Journal of Chemistry

The design or investigation of fluorescence probes continues to receive attention with respect to the diverse applications of spectrofluorometry. Depending on the highly sensitive character, fluorescence spectroscopy-based methodologies have been widely used in recent years in different sciences, including analytical, environmental, and medicinal chemistry areas. In our previous works, we have shown the iron (III) selective on-off sensor properties of benzo[c]chromen-6-one derivatives. In this study, we have extrapolated this research to 4-substituted analogues and investigated both fluorescent and metal interaction properties. Following the synthesis and structure identification studies, (±)-7,8,9,10-tetrahydro-3-hydroxy-4-(1-hydroxyethyl)benzo[c]chromen-6-one was found as a fluorescent molecule displaying fluorescence enhancement in the …

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Chromatographic Evaluation Of Tocols And Sterols Of Processed Canola Oil And Deodorizerdistillate, Hadia Shoaib, S. Tufail Sherazi, Saba Naz, Dr Sarfaraz Ahmed Mahesar, Abdul Rauf Khaskheli, Siraj Uddin, Ahmed Raza Sidhu, Hami̇de Fi̇li̇z Ayyildiz, Hüseyi̇n Kara, Mustafa Topkafa Jan 2022

Chromatographic Evaluation Of Tocols And Sterols Of Processed Canola Oil And Deodorizerdistillate, Hadia Shoaib, S. Tufail Sherazi, Saba Naz, Dr Sarfaraz Ahmed Mahesar, Abdul Rauf Khaskheli, Siraj Uddin, Ahmed Raza Sidhu, Hami̇de Fi̇li̇z Ayyildiz, Hüseyi̇n Kara, Mustafa Topkafa

Turkish Journal of Chemistry

Tocopherols and tocotrienols in the combined form are known as tocols. Changes of total and individual tocols and sterols concentration of canola oil and deodorizer distillate (DD) during different processing stages were evaluated with the application of gas chromatography (GC) and high-performance liquid chromatography (HPLC). For sterols analysis, GC coupled with flame ionization detector (FID) was used while tocols in canola oil samples and DD, normal phase (NP) HPLC was applied. The results of the present study indicated that levels of total and individual tocols and sterols content were decreased during processing (neutralization to deodorization). Deodorization was found to be …

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Clerodendrum Serratum Extract Attenuates Production Of Inflammatory Mediators Inovalbumin-Induced Asthma In Rats, Poonam Arora, Shahid Hamid Ansari, Lalit Mohan Nainwal Jan 2022

Clerodendrum Serratum Extract Attenuates Production Of Inflammatory Mediators Inovalbumin-Induced Asthma In Rats, Poonam Arora, Shahid Hamid Ansari, Lalit Mohan Nainwal

Turkish Journal of Chemistry

In the present study, ethanolic extract of Clerodendrum serratum roots was investigated for its potential to reverse some features of bronchial asthma in ovalbumin-induced murine model of asthma. Clerodendrum serratum commonly called bharangi, (family Solanaceae) is a well-known anti-allergic drug in Asian folk system of medicines. In the present work, pharmacological studies are done to provide scientific evidence for therapeutic potential of plant in allergic asthma. Asthma was induced in experimental rats with allergen suspension of ovalbumin and aluminum hydroxide followed by treatment with dexamethasone (2.5 mg/kg, po) or C. serratum root extract (0.53 and 5.3 mg/kg, b. w., po). …

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Thermodynamic And Kinetic Study Of Adsorptive Removal Of Lead By The Nanocompositeloaded Nanofibers, Urwa Mahmood, Sharjeel Abid, Bilal Qadir, Ahsan Nazir, Tanveer Hussain Jan 2022

Thermodynamic And Kinetic Study Of Adsorptive Removal Of Lead By The Nanocompositeloaded Nanofibers, Urwa Mahmood, Sharjeel Abid, Bilal Qadir, Ahsan Nazir, Tanveer Hussain

Turkish Journal of Chemistry

Herein, the fabrication of electrospun nanocomposites, using polyacrylonitrile nanofibers (PNF) modified with nanobentonite and fly ash, is explained. Further, the use of electrospun adsorbent for the remediation of Pb (II) ions from water has been explored. Pristine PNF and nanocomposites were characterized using SEM, EDX, and FTIR to analyze surface topology, elemental composition, and functional groups, respectively. The adsorptive behavior of developed adsorbents was investigated using the effects of dosage, initial concentration, time, and temperature. Pseudo-second order kinetics fit well with experimental data and the adsorption followed intra-particle diffusion. The thermodynamics study confirmed spontaneous endothermic adsorption of the heavy metal. …

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On The Dimensionality And Utility Of Convolutional Autoencoder’S Latent Space Trained With Topology-Preserving Spectral Eeg Head-Maps, Arjun Vinayak Chikkankod, Luca Longo Jan 2022

On The Dimensionality And Utility Of Convolutional Autoencoder’S Latent Space Trained With Topology-Preserving Spectral Eeg Head-Maps, Arjun Vinayak Chikkankod, Luca Longo

Articles

Electroencephalography (EEG) signals can be analyzed in the temporal, spatial, or frequency domains. Noise and artifacts during the data acquisition phase contaminate these signals adding difficulties in their analysis. Techniques such as Independent Component Analysis (ICA) require human intervention to remove noise and artifacts. Autoencoders have automatized artifact detection and removal by representing inputs in a lower dimensional latent space. However, little research is devoted to understanding the minimum dimension of such latent space that allows meaningful input reconstruction. Person-specific convolutional autoencoders are designed by manipulating the size of their latent space. A sliding window technique with overlapping is employed …

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Introduction To The Special Issue On Gala Conf 2021, Francesca De Rosa, Jannicke Baalsrud Hauge, Pierpaolo Dondio, Isa Marfizi-Schottman, Margarida Romero, Francesco Bellotti Jan 2022

Introduction To The Special Issue On Gala Conf 2021, Francesca De Rosa, Jannicke Baalsrud Hauge, Pierpaolo Dondio, Isa Marfizi-Schottman, Margarida Romero, Francesco Bellotti

Articles

This special issue of the International Journal of Serious Games is dedicated to the selected best papers of the 2021 edition of the GALA conference. This edition was organized by Francesca De Rosa and her team at NATO Centre for Maritime Research and Experimen-tation (CMRE), La Spezia, Italy. Because of the Covid-19 pandemic, it was held online, for the second year. The three papers published in this special issue were first selected for a content exten-sion, so to make them suitable as journal papers, then underwent the regular IJSG peer-review process, which, on the other hand, discarded other three selected …

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Power Management In Hybrid Anfis Pid Based Ac–Dc Microgrids With Eho Based Cost Optimized Droop Control Strategy, T. Narasimha Prasad, S. Devakirubakaran, S. Muthubalaji, S. Srinivasan, B. Karthikeyan, R. Palanisamy, Mohit Bajaj, Hossam Zawbaa, Salah Kamel Jan 2022

Power Management In Hybrid Anfis Pid Based Ac–Dc Microgrids With Eho Based Cost Optimized Droop Control Strategy, T. Narasimha Prasad, S. Devakirubakaran, S. Muthubalaji, S. Srinivasan, B. Karthikeyan, R. Palanisamy, Mohit Bajaj, Hossam Zawbaa, Salah Kamel

Articles

One of the most critical operations aspects is power management strategies for hybrid AC/DC microgrids. This work presented power management in hybrid AC–DC microgrids with a droop control strategy. At first, photovoltaic, Wind, and battery are used as the power sources, which supply the power with uncertainties. The AC and DC microgrids are controlled by an Adaptive neuro-fuzzy inference system (ANFIS) controller and Proportional Integral Derivative (PID) controller. Simultaneously we calculate the running cost for photovoltaic, Wind, and Battery. Moreover, an optimizer based on the elephant herding optimization algorithm is formulated to reduce the cost price. This method utilizes two …

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Human Mental Workload: A Survey And A Novel Inclusive Definition, Luca Longo, Christopher D. Wickens, Gabriella Hancock, P.A. Hancock Jan 2022

Human Mental Workload: A Survey And A Novel Inclusive Definition, Luca Longo, Christopher D. Wickens, Gabriella Hancock, P.A. Hancock

Articles

Human mental workload is arguably the most invoked multidimensional construct in Human Factors and Ergonomics, getting momentum also in Neuroscience and Neuroergonomics. Uncertainties exist in its characterization, motivating the design and development of computational models, thus recently and actively receiving support from the discipline of Computer Science. However, its role in human performance prediction is assured. This work is aimed at providing a synthesis of the current state of the art in human mental workload assessment through considerations, definitions, measurement techniques as well as applications, Findings suggest that, despite an increasing number of associated research works, a single, reliable and …

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Examining The Size Of The Latent Space Of Convolutional Variational Autoencoders Trained With Spectral Topographic Maps Of Eeg Frequency Bands, Taufique Ahmed, Luca Longo Jan 2022

Examining The Size Of The Latent Space Of Convolutional Variational Autoencoders Trained With Spectral Topographic Maps Of Eeg Frequency Bands, Taufique Ahmed, Luca Longo

Articles

Electroencephalography (EEG) is a technique of recording brain electrical potentials using electrodes placed on the scalp [1]. It is well known that EEG signals contain essential information in the frequency, temporal and spatial domains. For example, some studies have converted EEG signals into topographic power head maps to preserve spatial information [2]. Others have produced spectral topographic head maps of different EEG bands to both preserve information in The associate editor coordinating the review of this manuscript and approving it for publication was Ludovico Minati . the spatial domain and take advantage of the information in the frequency domain [3]. …

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Towards An Inclusive Co-Design Toolkit: Perceptions And Experiences Of Co-Design Stakeholders, Eamon Aswad, Emma Murphy, Claudia Fernandez-Rivera, Sarah Boland Jan 2022

Towards An Inclusive Co-Design Toolkit: Perceptions And Experiences Of Co-Design Stakeholders, Eamon Aswad, Emma Murphy, Claudia Fernandez-Rivera, Sarah Boland

Articles

Participatory design holds great potential for the creation of inclusive technology but existing toolkits and resources to support co-design are not always accessible to designers and co-designers with disabilities. In this paper we present two studies to assist in facilitating the creation of a sustainable, accessible, inclusive co-design toolkit for individuals with intellectual disabilities i) exploration of the perceptions and experiences of lecturers (n =5) and students (n= 5) involved in co-design activities via individual interviews and ii) a protocol and initial findings from focus groups with men and women with intellectual disabilities to inform on best co-design practices (n=15). …

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Selective Catalytic Hydrogenation Of Cellulose Into Sorbitol With Ru-Based Catalysts, Ceren Orak, Aycan Sapmaz, Asli Yüksel Özşen Jan 2022

Selective Catalytic Hydrogenation Of Cellulose Into Sorbitol With Ru-Based Catalysts, Ceren Orak, Aycan Sapmaz, Asli Yüksel Özşen

Turkish Journal of Chemistry

Sorbitol is one of the platform chemicals and can be produced from various renewable and sustainable sources via different processes. Hydrothermal liquefaction is an effective and promising approach to produce sorbitol, since the subcritical reaction media and appropriate catalysts provide a selective production of platform chemicals. In this study, sorbitol was produced from different renewable sources (cellulose and glucose) in the presence of Ru-based catalysts (Ru/SiO2, Ru/AC, Ru/SBA-15, and Ru/SBA-15-SO3) under subcritical conditions. The highest cellulose conversion was achieved as 90% in the presence of Ru/SBA-15-SO3 for 1 h of reaction duration. The highest sorbitol yield (%) by hydrothermal liquefaction …

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The Association Between Ambient Uvb Dose And Anca‑Associated Vasculitis Relapse And Onset, Jennifer Scott, Enock Havyarimana, Albert Navarro-Gallinad, Arthur White, Jason Wyse, Jos Van Geffen, Michiel Van Weele, Antonia Buettner, Tamara Wanigasekera, Cathal Walsh, Louis Aslett, John Kelleher, Julie Power, James Ng, Declan O’Sullivan, Lucy Hederman, Neil Basu, Mark A. Little, Lina Zgaga Jan 2022

The Association Between Ambient Uvb Dose And Anca‑Associated Vasculitis Relapse And Onset, Jennifer Scott, Enock Havyarimana, Albert Navarro-Gallinad, Arthur White, Jason Wyse, Jos Van Geffen, Michiel Van Weele, Antonia Buettner, Tamara Wanigasekera, Cathal Walsh, Louis Aslett, John Kelleher, Julie Power, James Ng, Declan O’Sullivan, Lucy Hederman, Neil Basu, Mark A. Little, Lina Zgaga

Articles

The aetiology of ANCA-associated vasculitis (AAV) and triggers of relapse are poorly understood. Vitamin D (vitD) is an important immunomodulator, potentially responsible for the observed latitudinal differences between granulomatous and non-granulomatous AAV phenotypes. A narrow ultraviolet B spectrum induces vitD synthesis (vitD-UVB) via the skin. We hypothesised that prolonged periods of low ambient UVB (and by extension vitD deficiency) are associated with the granulomatous form of the disease and an increased risk of AAV relapse.

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Study On The Alkylation Of Aromatic Hydrocarbons And Propylene, Wanglai Dong, Wentao Ma, Xinyao Li, Xingbang Hu, Zheng Zhou Jan 2022

Study On The Alkylation Of Aromatic Hydrocarbons And Propylene, Wanglai Dong, Wentao Ma, Xinyao Li, Xingbang Hu, Zheng Zhou

Turkish Journal of Chemistry

In order to improve the efficiency of the alkylation reaction to aromatic hydrocarbons and propylene, different types of catalysts were screened, including ultra-stable Y molecular sieves (USY), solid phosphoric acid (SPA), ZSM type molecular sieve (HZSM), etc. The effects of reaction temperature, catalyst loading, and reaction time on the conversion rate of aromatic hydrocarbons and the selectivity of target products were investigated using the high-pressure reaction device. The catalysts were characterized by XRD, BET, SEM, FT-IR, NH3-TPD, and other methods. The experimental results show that the USY catalyst exhibits higher catalytic activity for alkylation. This catalyst can be used for …

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Modeling Cognitive Load As A Self-Supervised Brain Rate With Electroencephalography And Deep Learning, Luca Longo Jan 2022

Modeling Cognitive Load As A Self-Supervised Brain Rate With Electroencephalography And Deep Learning, Luca Longo

Articles

The principal reason for measuring mental workload is to quantify the cognitive cost of performing tasks to predict human performance. Unfortunately, a method for assessing mental workload that has general applicability does not exist yet. This is due to the abundance of intuitions and several operational definitions from various fields that disagree about the sources or workload, its attributes, the mechanisms to aggregate these into a general model and their impact on human performance. This research built upon these issues and presents a novel method for mental workload modelling from EEG data employing deep learning. This method is self-supervised, employing …

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Fluorometric Determination Of Ornidazole By Using Bsa Coated Copper Nanoclusters As A Novel Turn Off Sensor, Mehmetcan Bi̇lkay, Hayri̇ye Eda Şatana Kara Jan 2022

Fluorometric Determination Of Ornidazole By Using Bsa Coated Copper Nanoclusters As A Novel Turn Off Sensor, Mehmetcan Bi̇lkay, Hayri̇ye Eda Şatana Kara

Turkish Journal of Chemistry

A fluorescent probe based on bovine serum albumin stabilized copper nanoclusters (BSA-CuNCs) was developed for the selective and sensitive determination of ornidazole (ORN). The nanoclusters were synthesized via a one-pot hydrothermal process in basic media. The synthesized and characterized BSA-CuNCs have less than 3 nm particle size and exhibited blue emission at 405 nm when excited at 325 nm. Synthesized and characterized nanoclusters were successfully applied as a turn-off fluorescent probe for the determination of ORN in pharmaceutical dosage forms. The quenching mechanism created an was inner filter effect (IFE). The method was linear in the concentration range of 0.52-13.56 …

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Preparation, Assessment, And Swelling Study Of Amphiphilic Acrylic Acid/Chitosan-Based Semi-Interpenetrating Hydrogels, Mohammad Reza Jozaghkar, Amir Sepehrianazar, Farshid Ziaee, Fakhrosadat Mirtaleb Jan 2022

Preparation, Assessment, And Swelling Study Of Amphiphilic Acrylic Acid/Chitosan-Based Semi-Interpenetrating Hydrogels, Mohammad Reza Jozaghkar, Amir Sepehrianazar, Farshid Ziaee, Fakhrosadat Mirtaleb

Turkish Journal of Chemistry

The aim of this study was to synthesize amphiphilic semi-IPN hydrogels based on acrylic acid (AA) and chitosan (CS) using AIBN as an initiator and N,N?methylene bis acrylamide as a crosslinking agent. The swelling behavior of the hydrogels was evaluated at a variety of pH values, temperature, the salinity of media and time, and the swelling mechanism was investigated using Fickian diffusion and Schott's 2nd-order-kinetics models. FTIR spectroscopy was used to confirm the synthesis of AA/CS hydrogel. The swelling results showed that, in the acidic media, as the CS content increase the hydrogel swelling ratio reduces. It was found that …

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Biological Potential Of Copper Complexes: A Review, Jamshaid Ashraf, Muhammad Asad Riaz Jan 2022

Biological Potential Of Copper Complexes: A Review, Jamshaid Ashraf, Muhammad Asad Riaz

Turkish Journal of Chemistry

This review comprises the inorganic compounds particularly metal coordinated complexes, as drugs play a relevant role in medicinal chemistry. It has been observed that copper complexes are potentially attractive as medicinal importance. In this review, the most remarkable achievements of copper complexes undertaken over the past few decades as antimicrobial, antioxidant, enzyme inhibition activity, and anti-cancer agents are discussed. This work was motivated by the observation that no comprehensive surveys of the diversity of biological activities of copper complexes were available in the literature.

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Polymer Based Advanced Recipes For Imidazoles: A Review, Shivnath Patel, Rajendra Patil, Jagdish Chavan, Anil Beldar Jan 2022

Polymer Based Advanced Recipes For Imidazoles: A Review, Shivnath Patel, Rajendra Patil, Jagdish Chavan, Anil Beldar

Turkish Journal of Chemistry

Imidazoles and their scaffold are an extraordinarily essential class of nitrogen bearing azole heterocyclic compounds. They have different place in wide area of organic synthesis, which can be utilized in a variety of applications in diverse fields including agriculture, medicine, polymer and various industries. Numerous methods for synthesis of imidazole derivatives are reported in last few decades. Existing conventional methods are more or less significant and confined due to its time-consuming reactions, high cost of catalyst, extensive methodologies, low yield rate or no reusability respectively. Overcoming to inefficient conventional methods, finding of novel and effective methods of imidazole synthesis becomes …

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Synthesis Of A Novel Antiweathering Nanocomposite Superhydrophobic Room Temperaturevulcanized (Rtv) Silicon Rubber Enhanced With Nanosilica For Coating High Voltageinsulators, Khalid K. Abbas, Mayyadah S. Abed, Ali F. Jasim Jan 2022

Synthesis Of A Novel Antiweathering Nanocomposite Superhydrophobic Room Temperaturevulcanized (Rtv) Silicon Rubber Enhanced With Nanosilica For Coating High Voltageinsulators, Khalid K. Abbas, Mayyadah S. Abed, Ali F. Jasim

Turkish Journal of Chemistry

A new nanocomposite superhydrophobic of the RTV (room temperature vulcanized) silicon rubber reinforced with a different percentage of nanosilica was prepared by a two-stage sol-gel route to obtain a superhydrophobic surface coating on high voltage glass insulator, preventing the dust-water droplet from adhering to its surface. The cold spraying technique was utilized to build up a thin nanocomposite superhydrophobic layer on the glass insulator containing different percentages of the nanosilica particles, such as 23 wt %, 33 wt %, and 44 wt % with RTV silicon substrate. The synthesized nanocomposite was analyzed using the contact angle, roughness, adhesion, hardness, and …

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An Experimental And Theoretical Analysis Of Supercritical Carbon Dioxide Extraction Of Cu(Ii) And Pb(Ii) Ions In The Form Of Dithizone Bidentate Complexes, Jeton Halili, Avni Berisha Jan 2022

An Experimental And Theoretical Analysis Of Supercritical Carbon Dioxide Extraction Of Cu(Ii) And Pb(Ii) Ions In The Form Of Dithizone Bidentate Complexes, Jeton Halili, Avni Berisha

Turkish Journal of Chemistry

For more than five decades, dithizone has been widely used as an analytical reagent. This ligand forms strongly colored complexes with metal ions and this ability to form complexes can be used for extraction/removal of certain metal ions in addition to analytical determination. In static mode, the supercritical carbon dioxide extraction of copper and lead ions from aqueous solutions after complexation by the dithizone ligand is studied (at two different conditions: a) p = 120 bar, T = 30 °C, and b) p = 72 bar, T = 50 °C). The addition of methanol improved the extraction process by modulating …

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Catalytic Activity Of Ethylbenzene With Product Selectivity By Gold Nanoparticlessupported On Zinc Oxide, Afiq Anwar, Azman Ma'amor, H.N.M. Ekramul Mahmud, Wan Jefrey Basirun, Iskandar Abdullah Jan 2022

Catalytic Activity Of Ethylbenzene With Product Selectivity By Gold Nanoparticlessupported On Zinc Oxide, Afiq Anwar, Azman Ma'amor, H.N.M. Ekramul Mahmud, Wan Jefrey Basirun, Iskandar Abdullah

Turkish Journal of Chemistry

The oxidation of ethylbenzene (EB) using tert-butyl hydroperoxide as the oxidizing agent was carried out in presence of gold nanoparticles (3 nm) supported on zinc oxide in acetonitrile solution. A higher selectivity towards acetophenone (ACP) as the major product, and a moderate selectivity towards other products such as 1-phenylethanol (PE), benzaldehyde (BZL), and benzoic acid (BzA) were observed using the prepared Au/ZnO nanocatalysts at 100 °C for 24 h. It is suggested the reaction produces an intermediate product, which is dimethylethyl-1-phenylethyl peroxide through a radical mechanism. A small amount of benzaldehyde was observed because benzaldehyde went autoxidation to form benzoic …

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Synthesis Of Some New Isoxazole Compounds And Their Biological Tyrosinase And Antioxidant Activities, Seda Fandakli Jan 2022

Synthesis Of Some New Isoxazole Compounds And Their Biological Tyrosinase And Antioxidant Activities, Seda Fandakli

Turkish Journal of Chemistry

In this study, 7 new isoxazole compounds (8-14) were synthesized from the cyclization of chalcone compounds (1-7) containing different functional groups with hydroxylamine hydrochloride in alkaline medium. Tyrosinase and antioxidant properties of 8-14 were investigated. IC50 values for the tyrosinase enzyme inhibition of compounds 8, 11, 12, and 13 were varied between 61.47 ± 3.46 and 188.52 ± 5.85, while compounds 9, 10 and 14 did not show any inhibition effect. The antioxidant properties of 8-14 were investigated by DPPH and CUPRAC methods. Compound 12 showed the best DPPH radical scavenging activity (SC50: 40.21 ± 2.71), while 12 and 13 …

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