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Evaluation Of Phytochemicals And The Role Of Oxidative Stress Pathways During Fruit Development In Strawberries (Fragaria×Ananassa), Fahimeh Mokhtari Shojaee, Elham Mohajel Kazemi, Houshang Nosrati, Maryam Kolahi, Mehdi Haghi
Evaluation Of Phytochemicals And The Role Of Oxidative Stress Pathways During Fruit Development In Strawberries (Fragaria×Ananassa), Fahimeh Mokhtari Shojaee, Elham Mohajel Kazemi, Houshang Nosrati, Maryam Kolahi, Mehdi Haghi
Turkish Journal of Botany
Strawberries (Fragaria × ananassa) are one of the Rosaceae family, considered economically and nutritionally important berry fruits. Phytochemicals are crucial ingredients that contribute to characteristics such as the fruit?s aroma and flavor. The current study investigated the phytochemical characteristics of strawberry fruit at three developmental stages (green, white, and red). HPLC measurements determined the glucose, fructose, and sucrose concentrations significantly increased in the red fruit, whereas glucose was identified as the major sugar in ripe fruit (2.8 g.g-1FW). Evaluation of the phenylpropanoid pathway implied that the amount of total phenol and flavonoid following phenylalanine ammonia-lyase enzyme activity decreased …
Adjunction Greatest Element To Ordered Hypersemigroups, Niovi Kehayopulu
Adjunction Greatest Element To Ordered Hypersemigroups, Niovi Kehayopulu
Turkish Journal of Mathematics
As a continuation of the paper "Adjunction Identity to Hypersemigroup" in Turk J Math 2022; 46 (7): 2834--2853, it has been proved here that the adjunction of a greatest element to an ordered hypersemigroup is actually an embedding problem. The concept of pseudoideal has been introduced and has been proved that for each ordered hypersemigroup $S$ an ordered hypersemigroup $V$ having a greatest element ($poe$-hypersemigroup) can be constructed in such a way that there exists a pseudoideal $T$ of $S$ such that $S$ is isomorphic to $T$. If $S$ does not have a greatest element, then this can be regarded …
On The Eigenstructure Of The $Q$-Durrmeyer Operators, Övgü Gürel Yilmaz
On The Eigenstructure Of The $Q$-Durrmeyer Operators, Övgü Gürel Yilmaz
Turkish Journal of Mathematics
The purpose of this paper is to establish the eigenvalues and the eigenfunctions of both the $q$-Durrmeyer operators $D_{n,q}$ and the limit $q$-Durrmeyer operators $D_{\infty,q}$ introduced by V. Gupta in the case 0<$q$<1. All moments for $D_{n,q}$ and $D_{\infty,q}$ are provided. The coefficients for the eigenfunctions of the operators are explicitly derived and the eigenfunctions of these operators are illustrated by graphical examples.
Higher Topological Complexity Of A Map, Cesar Augusto Ipanaque Zapata, Jesús González
Higher Topological Complexity Of A Map, Cesar Augusto Ipanaque Zapata, Jesús González
Turkish Journal of Mathematics
The higher topological complexity of a space $X$, $\text{TC}_r(X)$, $r=2,3,\ldots$, and the topological complexity of a map $f$, $\text{TC}(f)$, have been introduced by Rudyak and Pavesiç, respectively, as natural extensions of Farber's topological complexity of a space. In this paper we introduce a notion of higher topological complexity of a map $f$, $\text{TC}_{r,s}(f)$, for $1\leq s\leq r\geq2$, which simultaneously extends Rudyak's and Pavesiç notions. Our unified concept is relevant in the $r$-multitasking motion planning problem associated to a robot devise when the forward kinematics map plays a role in $s$ prescribed stages of the motion task. We study the homotopy …
Operators Affiliated To Banach Lattice Properties And Their Enveloping Norms, Eduard Emelyanov, Svetlana Gorokhova
Operators Affiliated To Banach Lattice Properties And Their Enveloping Norms, Eduard Emelyanov, Svetlana Gorokhova
Turkish Journal of Mathematics
Several recent papers were devoted to various modifications of limited, Grothendieck, and Dunford-Pettis operators, etc., through involving the Banach lattice structure. In the present paper, it is shown that many of these operators appear as operators affiliated to well-known properties of Banach lattices, like the disjoint (dual) Schur property, the disjoint Grothendieck property, the property (d), the sequential w$^\ast$-continuity of the lattice operations, etc. We also introduce new classes of operators such as the s-GPP-operators, s-BDP-operators, and bi-sP-operators. It is proved that the spaces consisting of regular versions of the above-mentioned operators are all the Banach spaces. The domination problem …
Extended Calculus On ${\Cal O}({\Mathbb C}_{H}^{1\Vert1})$, Sali̇h Çeli̇k
Extended Calculus On ${\Cal O}({\Mathbb C}_{H}^{1\Vert1})$, Sali̇h Çeli̇k
Turkish Journal of Mathematics
We give an extended calculus over the function algebra on $h$-deformed superplane. For this, we extend the $(h_1,h_2)$-deformed differential calculus on the $h$-deformed superplane by adding inner derivations. We reformulate the results with an $R$-matrix and present the tensor product realization of the wedge product. We also discuss Cartan calculus via a contraction.
On The Monoid Of Partial Isometries Of A Cycle Graph, Vitor H. Fernandes, Tania Paulista
On The Monoid Of Partial Isometries Of A Cycle Graph, Vitor H. Fernandes, Tania Paulista
Turkish Journal of Mathematics
In this paper we consider the monoid $DPC_n$ of all partial isometries of an $n$-cycle graph $C_n$. We show that $DPC_n$ is the submonoid of the monoid of all oriented partial permutations on an $n$-chain whose elements are precisely all restrictions of a dihedral group of order $2n$. Our main aim is to exhibit a presentation of $DPC_n$. We also describe Green's relations of $DPC_n$ and calculate its cardinality and rank.
The Application Of Brzdek's Fixed Point Theorem In The Stability Problem Of The Drygas Functional Equation, Mehdi Dehghanian, Yamin Sayyari
The Application Of Brzdek's Fixed Point Theorem In The Stability Problem Of The Drygas Functional Equation, Mehdi Dehghanian, Yamin Sayyari
Turkish Journal of Mathematics
Using the Brzdek fixed point theorem, we establish the Hyers?Ulam stability problem of Drygas functional equations \begin{equation} \delta(x+y-z)+\delta(x-y)+\delta(-y-z)+\delta(y)=\delta(x-y-z)+\delta(y-z)+\delta(x+y)+\delta(-y)\nonumber \end{equation} for all $x,y,z\in A$.
Modification Of The Sector Theorem Of Kondo-Tanaka, Eric Choi
Modification Of The Sector Theorem Of Kondo-Tanaka, Eric Choi
Turkish Journal of Mathematics
Kondo-Tanaka proved that if a rotationally symmetric plane $M_m$ is von Mangoldt or Cartan-Hadamard outside a compact set and has finite total curvature, then it has a sector with no pair of cut points. We show that the condition of finite total curvature can be removed. %The abstract should provide clear information about the research and the results obtained, and should not exceed 200 words. The abstract should not contain citations.
On Positive Periodic Solutions To Third-Order Integro-Differential Equations With Distributed Delays, Mimia Benhadri, Tomas Caraballo
On Positive Periodic Solutions To Third-Order Integro-Differential Equations With Distributed Delays, Mimia Benhadri, Tomas Caraballo
Turkish Journal of Mathematics
In this paper, we investigate the existence of positive periodic solutions of a third-order nonlinear integro-differential equation with distributed delays, by using the Green function and the Krasnosel'skii fixed point theorem in cones of Banach spaces, providing new results on this field. Three examples are analyzed to illustrate the effectiveness of the abstract results.
Identities Involving Special Functions From Hypergeometric Solution Of Algebraic Equations, Juan Luis Gonzalez-Santander
Identities Involving Special Functions From Hypergeometric Solution Of Algebraic Equations, Juan Luis Gonzalez-Santander
Turkish Journal of Mathematics
From the algebraic solution of $x^{m}-x+t=0$ for $m=2,3,4$ and the corresponding solution in terms of hypergeometric functions, we obtain a set of reduction formulas for hypergeometric functions. By differentiation and integration of these results, and applying other known reduction formulas of hypergeometric functions, we derive new reduction formulas of special functions as well as the calculation of some definite integrals in terms of elementary functions.
Fractional Semilinear Neumann Problem With Critical Nonlinearity, Zhenfeng Jin, Hongrui Sun
Fractional Semilinear Neumann Problem With Critical Nonlinearity, Zhenfeng Jin, Hongrui Sun
Turkish Journal of Mathematics
In this paper, we consider the following critical fractional semilinear Neumann problem \begin{equation*} \begin{cases} (-\Delta)^{1/2}u+\lambda u=u^{\frac{n+1}{n-1}},~u>0\quad&\, \mathrm{in}\ \Omega,\\ \partial_\nu{u}=0 &\mathrm{on}\ \partial\Omega, \end{cases} \end{equation*} where $\Omega\subset\mathbb{R}^n~(n\geq5)$ is a smooth bounded domain, $\lambda>0$ and $\nu$ is the outward unit normal to $\partial\Omega$. We prove that there exists a constant $\lambda_0>0$ such that the above problem admits a minimal energy solution for $\lambda<\lambda_0$. Moreover, if $\Omega$ is convex, we show that this solution is constant for sufficiently small $\lambda$.
Liouville-Type Theorem For One-Dimensional Porous Medium Systems With Sources, Anh Tuan Duong
Liouville-Type Theorem For One-Dimensional Porous Medium Systems With Sources, Anh Tuan Duong
Turkish Journal of Mathematics
In this paper, we are concerned with the one-dimensional porous medium system with sources \begin{align*} \begin{cases}u_t-( u^m)_{xx} =a_{11}u^{p}+a_{12} u^rv^{r+m}, (x,t)\in J\times I\subset\mathbb{R}\times \mathbb{R}\\ v_t-(v^m)_{xx} =a_{21} u^{r+m}v^{r}+a_{22}v^{p},\;(x,t)\in J\times I\subset \mathbb{R}\times \mathbb{R}, \end{cases} \end{align*} where $p=2r+m$, $m>1$, $r>0$. Under the conditions $a_{12}\geq 0, a_{21}\geq 0$, $a_{11}>0$, and $a_{22}>0$, we prove that the system does not possess any nontrivial nonnegative weak solution.
A Short Note On A New Approach To Rayleigh-Bénard-Chandrasekhar Convection In Weakly Electrically Conducting Viscoelastic Liquids, Hati̇ce Muti̇
A Short Note On A New Approach To Rayleigh-Bénard-Chandrasekhar Convection In Weakly Electrically Conducting Viscoelastic Liquids, Hati̇ce Muti̇
Turkish Journal of Mathematics
The onset of magnetoconvection (known as Rayleigh-Bénard-Chandrasekhar convection) in two relaxation time viscoelastic liquids is studied here without seeking explicit recourse to a normal stress formulation as is usually done in these studies. Magnetoconvection refers to the flow of fluid in the presence of both thermal gradients (Rayleigh-Bénard convection) and a magnetic field. When these two effects are combined, they can lead to interesting and complex patterns of fluid motion. Understanding magnetoconvection in viscoelastic liquids is crucial for various industrial and scientific applications. The hyperbolic-type of linear momentum equation is decomposed into two first-order equations in time by cleverly separating …
On The Weak And Strong Solutions Of The Velocity-Vorticity Model Of The $G$-Navier-Stokes Equations, Özge Kazar, Meryem Kaya
On The Weak And Strong Solutions Of The Velocity-Vorticity Model Of The $G$-Navier-Stokes Equations, Özge Kazar, Meryem Kaya
Turkish Journal of Mathematics
In this work, we consider a velocity-vorticity formulation for the $g$-Navier-Stokes equations. The system is constructed by combining the velocity-pressure system which is included by using the rotational formulation of the nonlinearity and the vorticity equation for the $g$ -Navier-Stokes equations. We prove the existence and uniqueness of weak and strong solutions of this system with the periodic boundary conditions.
Existence Results For Impulsive Dynamic Singular Nonlinear Sturm-Liouville Equations On Infinite Intervals, Bi̇lender Paşaoğlu Allahverdi̇ev, Hüseyi̇n Tuna, Hamlet Abdullaoğlu Isayev
Existence Results For Impulsive Dynamic Singular Nonlinear Sturm-Liouville Equations On Infinite Intervals, Bi̇lender Paşaoğlu Allahverdi̇ev, Hüseyi̇n Tuna, Hamlet Abdullaoğlu Isayev
Turkish Journal of Mathematics
The purpose of this study is to investigate an impulsive dynamic singular nonlinear Sturm-Liouville problem on infinite intervals. The existence and uniqueness of the solutions of such problem will be investigated by considering Weyl's limit-circle case.
Tolerance Limit Of Physicochemical Water Parameters In Giant Freshwater Prawn (Macrobrachium Rosenbergii) In A Captive Condition, Rasina Rasid, Amira Liyana Tajuddin, Mohamad Abu Ubaidah Amir Abu Zarim, Suresh Thanakodi, Syarifah Bahiyah Rahayu, Nur Diyana Kamarudin, Amy Aineda Omar, Mohd Fazrul Hisam Abdul Aziz, Ahasan Habib
Tolerance Limit Of Physicochemical Water Parameters In Giant Freshwater Prawn (Macrobrachium Rosenbergii) In A Captive Condition, Rasina Rasid, Amira Liyana Tajuddin, Mohamad Abu Ubaidah Amir Abu Zarim, Suresh Thanakodi, Syarifah Bahiyah Rahayu, Nur Diyana Kamarudin, Amy Aineda Omar, Mohd Fazrul Hisam Abdul Aziz, Ahasan Habib
Turkish Journal of Zoology
No abstract provided.
The Effects Of Various Lake Typologies On The Distribution Of Chironomus Spp. (Diptera), And Arguments On Optional Factors Of Water Framework Directive In Turkiye, Recep Bakir, Gürçay Kivanç Akyildiz, Mustafa Duran
The Effects Of Various Lake Typologies On The Distribution Of Chironomus Spp. (Diptera), And Arguments On Optional Factors Of Water Framework Directive In Turkiye, Recep Bakir, Gürçay Kivanç Akyildiz, Mustafa Duran
Turkish Journal of Zoology
No abstract provided.
Chemical And Biochemical Advantages Of The 'Hicaznar' Pomegranate Variety Over 'Katina' And 'Suruc' Varieties Grown In The Same Ecology, Beki̇r Erol Ak, Di̇cle Roza Sayi̇ner, İbrahi̇m Hali̇l Hati̇poğlu, Bi̇rgül Di̇kmetaş
Chemical And Biochemical Advantages Of The 'Hicaznar' Pomegranate Variety Over 'Katina' And 'Suruc' Varieties Grown In The Same Ecology, Beki̇r Erol Ak, Di̇cle Roza Sayi̇ner, İbrahi̇m Hali̇l Hati̇poğlu, Bi̇rgül Di̇kmetaş
Turkish Journal of Agriculture and Forestry
Pomegranate cultivation has spread to various parts of the world. Pomegranate has been grown almost anywhere in the world, mostly in Iran, India, China, Turkey and the United States. ‘Hicaznar’, ‘Katina’ and ‘Suruç’ pomegranate varieties were used as materials in this study. Analyses of antioxidants, sugars, anthocyanins, organic acids, and colourless phenolic compounds in the juices of these fruits were performed by HPLC and DPPH methods. According to our findings, the highest antioxidant capacity was found in ‘Hicaznar’ variety (19.42 mmol trolox L–1). ‘Hicaznar’ variety had high sugar composition in terms of glucose, fructose, and total sugars while the sucrose …
Assessing The Cooking And Quality Traits Diversity In The Seeds Of Faba Bean Germplasm, Yeter Çi̇lesi̇z, Muhammad Azhar Nadeem, Nevci̇han Gürsoy, Razi̇ye Kul, Tolga Karaköy
Assessing The Cooking And Quality Traits Diversity In The Seeds Of Faba Bean Germplasm, Yeter Çi̇lesi̇z, Muhammad Azhar Nadeem, Nevci̇han Gürsoy, Razi̇ye Kul, Tolga Karaköy
Turkish Journal of Agriculture and Forestry
Faba bean is protein-enriched legume crop consumed in the form of pods, and cooked seeds and is a part of the traditional food of many Mediterranean countries. It shows variations in its phenotypes, especially in seed size and color. Therefore, it is very important to investigate faba bean genotypes having less cooking time. Keeping this in view, a total of 399 faba bean accessions including three commercial varieties were obtained from International Center for Agricultural Research in the Dry Areas (ICARDA) and Aegean Agricultural Research Institute National Gene Bank for the investigation of cooking traits variations. The field experiments were …
The Effects Of Malt Flours Obtained From Different Cereals On Flour And Bread Quality, Mehmet Murat Karaoğlu, Gül Seda Rei̇s, Yeşi̇m Bedi̇r
The Effects Of Malt Flours Obtained From Different Cereals On Flour And Bread Quality, Mehmet Murat Karaoğlu, Gül Seda Rei̇s, Yeşi̇m Bedi̇r
Turkish Journal of Agriculture and Forestry
In this study, firstly, enzyme-active malt flours were obtained from different germinated grains including wheat, barley, rye, triticale, millet, maize, rice, and oat. Next, these enzyme-active malt flours and commercial enzyme were added to bread wheat flour in a level that provides the same amylolytic activity and their effects on bread quality were investigated. The germination process significantly increased the amylolytic enzyme activity in grains but also caused a significant change in L*, a*, and b* color values. Among flours containing different malt flours, the lowest delayed Zeleny sedimentation value was determined in flour containing paddy malt, while the highest …
Genome-Wide Association Studies Revealed Dartseq Loci Associated With Seed Traits In Turkish Common Bean Germplasm, Muhammad Azhar Nadeem, Faheem Shahzad Baloch
Genome-Wide Association Studies Revealed Dartseq Loci Associated With Seed Traits In Turkish Common Bean Germplasm, Muhammad Azhar Nadeem, Faheem Shahzad Baloch
Turkish Journal of Agriculture and Forestry
Seed traits are very important agronomic traits that contribute significantly into crop yield and are considered useful indicators to monitor the inheritance of quantitative traits influenced by genotype and environmental conditions. To investıgate genomic regions useful for breeding high-yielding and highly nutritious common bean (Phaseolus vulgaris L.) cultivars, a mini core collection of Turkish common bean germplasm was screened under five environments and two locations for seed traits (seed width, seed yield/plant (SYP), and hundred seed weight). The results of analysis of variance (ANOVA) across the environments revealed significant effects of genotypes and genotype by environment interaction (G × E) …
Multivariate Analysis For Agro-Morphological And Cooking Properties In Chickpea (Cicer Arietinum L.) Germplasm, Aybegün Ton
Multivariate Analysis For Agro-Morphological And Cooking Properties In Chickpea (Cicer Arietinum L.) Germplasm, Aybegün Ton
Turkish Journal of Agriculture and Forestry
The objective of the study is to reveal diversity among some chickpea germplasms and selection criteria for agromorphological and cooking properties using multivariate techniques for improving new cultivars. The experiment was arranged in augmented block design with 65 chickpea germplasms and 2 check cultivars during 2020/2021 and 2021/2022. Positive correlations of seed yield per plant were found with primer branches per plant, biological yield per plant, harvest index, pods per plant, and seeds per plant. The first four principal components (PCs) accounted for 88.8% of total existing variation for agromorphological traits. Seed dry weight showed positive and significant association with …
Phosphorus-Carrying Cascade Molecules: Inner Architecture To Biomedical Applications, Anbazhagan Thirumalai, Noureddine Elboughdiri, Karthick Harini, Koyeli Girigoswami, Agnishwar Girigoswami
Phosphorus-Carrying Cascade Molecules: Inner Architecture To Biomedical Applications, Anbazhagan Thirumalai, Noureddine Elboughdiri, Karthick Harini, Koyeli Girigoswami, Agnishwar Girigoswami
Turkish Journal of Chemistry
Cascade molecules are nearly uniform-sized macromolecules of small molecules or linear polymer cores built around symmetric branching units. A wide range of biological properties can be achieved with phosphorus-containing dendrimers, depending on their terminal functions, ranging from biomaterials to imaging, drug delivery, and acting as a drug by themselves. This feature article presents significant examples of phosphorus-containing dendrimers used to develop biochips, support cell cultures, carry or deliver biomacromolecules and drugs, bioimaging, and combinational benefits. Because of the thermal stability, ferrocene function, and physical and chemical properties of phosphorus, dendrimers show greater rigidity, mobility, and strength. These dendrimers will be …
Theoretical Analysis Of Oled Performances Of Some Aromatic Nitrogen-Containing Ligands, Mustafa Eli̇k
Theoretical Analysis Of Oled Performances Of Some Aromatic Nitrogen-Containing Ligands, Mustafa Eli̇k
Turkish Journal of Chemistry
It is well-known that tris(8-hydroxyquinoline) aluminum (Alq3) complex and N,N'diphenyl-N,N'-bis(3-methylphenyl)-1,1'- diphenyl-4,4'-diamine compound (TPD) are widely used as electron transfer material (ETL) and hole transfer material (HTL) in organic light emitting diode (OLED) structure, respectively. Considering the reference materials, in the present work, the OLED performances of some cyclic aromatic structures such as 4,4'azopyridine [AZPY], 4,4'-bipyridine [BIPY], 1,2-bis[4'-(4-methylphenyl)2,2':6'2' '-terpyridin6-yl]ethyne (BISTERPY), 5,5'-diamino-2,2'-bipyridine (DABP), dipyrido[3,2-a:2',3'c]phenazine (DPP), 4,7-phenanthroline (PHEN) including nitrogen atom have been theoretically analyzed. It is important to note that B3LYP/6-31G(d) and B3LYP/TZP levels of the theory were taken into account for the calculations about monomeric and dimeric structures, respectively. Additionally, the …
Preparation And Application Of Caffeic Acid Imprinted Polymer, Şeyda Karaman Ersoy, Esma Tütem, Kevser Sözgen Başkan, Mustafa Reşat Apak
Preparation And Application Of Caffeic Acid Imprinted Polymer, Şeyda Karaman Ersoy, Esma Tütem, Kevser Sözgen Başkan, Mustafa Reşat Apak
Turkish Journal of Chemistry
In the present study, molecularly imprinted polymers were synthesized using caffeic acid (CA) as a template molecule and then used for the extraction of CA and chlorogenic acid (CLA) from complex matrices. Syntheses were carried out in tetrahydrofuran as porogenic solvent using 4-vinyl pyridine, methacrylic acid, acrylamide, and 1-vinyl imidazole as monomers, ethylene glycol dimethacrylate as crosslinker and 2,2'-azobisisobutyronitrile as initiator. In polymerization processes, different ratios of the template:monomer:crosslinker (T:M:CrL) were used to obtain the most suitable polymer. Caffeic acid:4-vinylpiridine:ethylene glycol dimethacrylate's 1:4:16 mole ratio of MIP was determined as the most convenient polymer for CA recognition. In addition, nonimprinted …
In Vitro Antioxidant Activity Of Alginate Nanoparticles Encapsulating The Aqueous Extract Of Coccinia Grandis L., Walimuni Nayomi Deshani De Silva, Anoja Priyadarshani Attanayake, Liyanage Dona Ashanti Menuka Arawwawala, Desiree Nedra Karunaratne, Geethi Kaushalya Pamunuwa
In Vitro Antioxidant Activity Of Alginate Nanoparticles Encapsulating The Aqueous Extract Of Coccinia Grandis L., Walimuni Nayomi Deshani De Silva, Anoja Priyadarshani Attanayake, Liyanage Dona Ashanti Menuka Arawwawala, Desiree Nedra Karunaratne, Geethi Kaushalya Pamunuwa
Turkish Journal of Chemistry
Bioactive compounds in medicinal plants are more susceptible to preventing oxidative stress. Encapsulation of herbal extracts has empowered the properties and characteristics of bioactive compounds. Nanoencapsulation allows the enhancement of the stability of extracts and targeted drug delivery. The present study aims to determine the antioxidant activity of alginate nanoparticles encapsulating the aqueous extract of Coccinia grandis L. (Family: Cucurbitaceae). The aqueous extract of C. grandis (AqCG) was prepared by using ultrasonication (40 ° C, 20 min, 40 kHz) followed by refluxing (2½ h). The prepared AqCG (1-5 mg/mL) encapsulated alginate nanoparticles were synthesized by ionic gelation with the addition …
Effects Of Zsm-5 Zeolite On Pyrolysis Of Polystyrene: From Stabilizing To Catalyzing, Qing Yuan Ma, Zhen Huang, Xuan Ren, Jia Jia Zhao, Fu Chen, Li Jun Teng
Effects Of Zsm-5 Zeolite On Pyrolysis Of Polystyrene: From Stabilizing To Catalyzing, Qing Yuan Ma, Zhen Huang, Xuan Ren, Jia Jia Zhao, Fu Chen, Li Jun Teng
Turkish Journal of Chemistry
Nonisothermal pyrolysis measurements of polystyrene (PS)/ZSM-5 zeolite hybrids are conducted in N2 and thermogravimetric results have been kinetically analyzed with different isoconversional methods. Experimental results show that the addition of 5 and 10 wt.% ZSM-5 zeolite has increased the initial pyrolysis temperature of PS while the addition of 20 and 30 wt.% ZSM-5 zeolite can significantly decrease the initial pyrolysis temperature of PS. Elevated activation energy is resulted by adding low zeolite amount whereas reduced activation energy is obtained by adding high ZSM-5 amounts. The effect of zeolite ZSM-5 on PS pyrolysis can thus be observed to transfer from stabilizing …
Synthesis And Characterization Of Anderson-Evans Type Polyoxometalates, Antibacterial Properties, Hülya Avci Özbek
Synthesis And Characterization Of Anderson-Evans Type Polyoxometalates, Antibacterial Properties, Hülya Avci Özbek
Turkish Journal of Chemistry
In the present work, the new aluminium-substituted polyoxometalates of the Anderson-Evans type have been prepared and structurally defined by the reaction of aluminium (III) chloride hexahydrate and sodium tungstate dihydrate/sodium molybdate dihydrate in an aqueous basic medium. Elemental analysis, FT-IR, TGA, 1H NMR, and 31P NMR analysis revealed that these polyoxometalates had the following formula: [Ph4 P]3 [Al(OH)6 Mo6 O18]·4H2 O 1, [Ph4 P]3 [Al(OH)6 W6 O18]·4H2 O 2, [C7 H10N]3 [Al(OH)6 Mo6 O18]·4H2 O 3, [C7 H10N]3 [Al(OH)6 W6 O18]·4H2 O 4. The compounds 1 and 2 show promising antibacterial activity against gram-positive Staphylcoccus aureus ATCC 25923 and gram-negative …