Impact Of Surface Modification Of Green Algal Biomass By Phosphorylation On The Removal Of Copper(Ii) Ions From Water, Zakaria Al-Qodah, Mohammad Al-Shannag, Abdulaziz Amro, Eman Assirey, Mustafa Bob, Khalid Bani-Melhem, Malek Alkasrawi

Turkish Journal of Chemistry

A series of batch lab-scale experiments were performed to investigate the performance of dead phosphorylated algal biomass of Spirogyra species for the bioadsorption of Cu$^{+2}$ ions from aqueous solutions. FT-IR and SEM analyses were performed to characterize the phosphorylated and raw algae. The SEM analysis indicated that the phosphorus content increases by about 5 times. The isotherm equilibrium data indicated that phosphorylation enhances the removal of Cu$^{+2}$ from water by about 20%. The experimental isotherms fit well to Langmuir models with $R^{2}$ values close to 0.99. Adsorption kinetic study was conducted to investigate the effect of initial Cu$^{+2}$ concentrations, pH, …

Efficient Multicomponent Synthesis Of 1,2,3-Triazoles Catalyzed By Cu(Ii) Supported On Pei@Fe$_{3}$O$_{4}$ Mnps In A Water/Peg$_{300}$ System, Zeinab Hassanpour, Aziz Maleki, Morteza Hosseini, Lena Gorgannezhad, Vajihe Nejadshafiee, Ali Ramazani, Ismaeil Haririan, Abbas Shafiee, Mehdi Khoobi

Turkish Journal of Chemistry

A highly dispersible and magnetically recoverable Cu-PEI@Fe$_{3}$O$_{4}$ MNPs catalyst was prepared and successfully applied in one-pot three-component coupling of terminal alkynes, sodium azide, and alkyl bromides/chlorides in water to give 1,4-disubstituted 1,2,3-triazoles with good to excellent yields. The catalyst was fully characterized with FT-IR, TGA, TEM, SEM, VSM, EDX, cyclic voltammetry, and ICP-AES spectroscopic techniques. Furthermore, the catalyst was easily recycled by an external magnet and successfully reused six times in the reaction without significant loss of its catalytic activity and copper leaching. The large-scale reaction was also carried out in the absence of any base and reducing agent even …

Development Of A Sample Preparation Strategy For The Determination Of Tungsten In Soil Samples By Inductively Coupled Plasma Mass Spectrometry Using A Response Surface Methodology, Ümran Seven Erdemi̇r

Turkish Journal of Chemistry

An alternative rapid digestion method has been developed for the determination of tungsten (W) in soil samples using fractionation studies and response surface methodology. The digestion method using the Kjeldahl instrument was applied to samples, and soluble tungsten was determined via inductively coupled plasma mass spectrometry. Digestion parameters were selected depending on the results of fractionation studies and optimized using a four-factor and five-level central composite design. The contributions of the phosphoric acid concentration (X$_{1})$, digestion temperature (X$_{2})$, digestion time (X$_{3})$, and hydrochloric acid concentration (X$_{4})$ were evaluated for the determination of W from samples in which its levels were …

Microwave-Enhanced Fenton-Like Degradation By Surface-Modified Metal-Organic Frameworks As A Promising Method For Removal Of Dye From Aqueous Samples, Seyed Ershad Moradi, Shayessteh Dadfarnia, Ali Mohammad Haji Shabani, Saeed Emami

Turkish Journal of Chemistry

In the current research, the sulfonated metal-organic framework loaded on iron oxide nanoparticles, Fe$_{3}$O$_{4}$@MIL-100(Fe)-OSO$_{3}$H, has been synthesized and utilized as a Fenton-like catalyst for the decolorization of aqueous solutions containing methyl orange (MO) dye as a model organic pollutant. The morphology and structure of the catalyst were characterized by X-ray powder diffraction, transmission electron microscopy, Brunauer-Emmett-Teller analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The effects of various parameters on MO degradation were investigated and the optimum conditions for MO degradation were found to be an initial concentration of MO of 100 mg/L, initial concentration of …

Singlet Oxygen Generation From Poly[4-Diacetoxyiodo]Styrene And Hydrogen Peroxide, Mustafa Çatir

Turkish Journal of Chemistry

Treatment of hydrogen peroxide with a polymer-supported hypervalent iodine compound, poly[4-diacetoxyiodo] styrene (PDAIS), generates singlet molecular oxygen ($^{1}$O$_{2})$. Singlet oxygen generation was proved by trapping with typical organic compounds such as conjugated dienes, aromatic dienes, and electron-rich alkene. When compared to monomer analogue, the use of PDAIS in peroxidation of substrates gave slightly better yields (45%-96%). Regeneration and reuse of PDAIS showed similar activity. The mechanism underlying generation of singlet oxygen and reaction scope was examined.

Decolorization Of Reactive Orange 16 Via Ferrate(Vi) Oxidation Assisted By Sonication, Serkan Şahi̇nkaya

Turkish Journal of Chemistry

The decolorization of azo dye C.I. reactive orange 16 (RO 16) via ferrate(VI) and sono-ferrate(VI) methods, which is the combination of the ferrate(VI) oxidation method with sonication, has been achieved in the present study. The influences of some important operating parameters, which are the initial pH, the concentration of potassium ferrate(VI) (K$_{2}$FeO$_{4})$ and the RO 16 dye, and ultrasonic density (for only the sono-ferrate(VI) method), on the color removal have been investigated. The optimum conditions have been determined as pH = 7 and [K$_{2}$FeO$_{4}$] = 50 mg L$^{-1}$ for the individual ferrate(VI) oxidation method and pH = 7 and [K$_{2}$FeO$_{4}$] …

A New Method For Simultaneous Determination Of Trace Amounts Of Cu(Ii) And Ni(Ii) Ions By Preconcentration And Spectrophotometric Analysis, Berri̇n Topuz, Şennur Merve Adanur, Arda Yalçuk

Turkish Journal of Chemistry

Immediate preconcentration and spectrophotometric methods have been developed for the determination of trace amounts of cupric ion (Cu(II)) and nickel ion (Ni(II)) through a solid phase extraction with XAD-4-N,N'-bis-(salicylidene) cyclohexanediamine (XAD-4-SCHD) resin and a complex color reaction of the ions with 2,6-dimethyl-morpholine dithiocarbamate (DMMDTC) in Triton X-100 media. A high preconcentration factor of 125 was achieved. The spectrophotometric method was based on the measurements of the absorption of colored chelates of ions complexing with DMMDTC, and the adsorptions of the complex solutions were measured at their maximum absorption peaks at 460 and 328 nm for Cu(II) and Ni(II) ions, respectively. …

Experimental And Computational Studies On The Absorption Properties Of Novel Formazan Derivatives, Gülşen Türkoğlu, M. Emi̇n Çinar

Turkish Journal of Chemistry

Eight novel 3-(4-(benzyloxy)phenyl)-5-(4-bromophenyl)-1-(4-substituted-phenyl)formazan (4a-4h) were synthesized by coupling of substituted phenylhydrazones with diazonium salts of 4-bromoaniline. The substituted phenylhydrazones, which are intermediate products, were obtained from the condensation of substituted phenylhydrazines with 4-(benzyloxy)benzaldehyde. All target compounds were characterized by using FTIR, $^{1}$H NMR, $^{13}$C NMR, LC$-$MS spectrometry, and elemental analysis. Absorption spectra of these compounds in solvents with different polarities were investigated thoroughly. Time-dependent density functional theory (TD-DFT) studies were conducted to shed light on their electronic structures, Kohn--Sham orbitals, and electronic transitions.

Synthesis, In Vitro Dna Interactions, Cytotoxicities, Antioxidative Activities, And Topoisomerase Inhibition Potentials Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii), And Zn(Ii) Complexes With Azo-Oxime Ligands, Melek Çol Ayvaz, İbrahi̇m Turan, Bayram Dural, Seli̇m Demi̇r, Kaan Karaoğlu, Yüksel Ali̇yazicioğlu, Keri̇m Serbest

Turkish Journal of Chemistry

Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) transition metal complexes of 2-hydroxy-5-[(E)-(4-phenyl) diazenyl] benzaldehyde oxime and 2-hydroxy-5-[(E)-(4-nitrophenyl) diazenyl] benzaldehyde oxime ligands were synthesized and characterized through NMR, IR, ESI mass, and UV analysis. DNA binding abilities of the complexes were revealed using a UV-Vis spectrophotometer with the absorption titration and competitive binding techniques. Hydrolytic and oxidative DNA cleavage activities under different conditions were also proved. Topoisomerase I inhibition efficiencies and in vitro free radical scavenging activities of all complexes were examined. Finally, the selective cytotoxic potentials of all complexes were evaluated in human colon cancer, normal colon, and fibroblast cell lines …

Removal Of Pb(Ii) And Cd(Ii) From Aqueous Solution Using Alkaline-Modified Pumice Stone Powder (Psp): Equilibrium, Kinetic, And Thermodynamic Studies, Vivian Jonasi, Kaina Matina, Upenyu Guyo

Turkish Journal of Chemistry

Adsorption processes of Cd(II) and Pb(II) from aqueous solutions onto pumice stone powder (PSP) were investigated in batch mode. The influences of solution pH, contact time, adsorbent dosage, initial metal (M) concentration, and temperature on adsorption process were investigated. The kinetic and isotherm data were analysed using different model equations. The adsorption process was consistent with the Langmuir model for both metal ions with high R$^{2}$ and low $\chi^{2}$ values for both Pb(II) and Cd(II). The maximum monolayer adsorption capacities were 28.09 and 27.17 mg g$^{-1}$ for Pb(II) and for Cd(II), respectively. The pseudo-second order kinetic model explained the kinetic …

Nanocomposite Copper Metal As An Efficient Heterogeneous Catalyst In Click Synthesis Of 1,2,3-Triazoles In Aqueous Media, Vajihe Nejadshafiee, Hossein Naeimi

Turkish Journal of Chemistry

Copper/periodic mesoporous organosilica (Cu/PMO) nanocomposites provided a highly active, reusable, globular, solid-phase catalyst for click chemistry. The reaction proceeds by mixing organohalides, sodium azide, alkyne, and the catalyst in an aqueous medium to afford the desired products. The cost efficiency and recyclability of the catalyst up to six runs without appreciable loss of activity and high yields of products make this procedure greener.

Cyclic Voltammetry Behavior Of Tamoxifen In Different Electrolytes, Electrochemical Characterization, And Its Measurement By Differential Pulse Anodic Voltammetry, Zeinab Deris Falahieh, Mehdi Jalali, Mohammad Alimoradi

Turkish Journal of Chemistry

Cyclic voltammetry (CV) was performed on tamoxifen (tam) using different electrodes and in various acidic electrolytes containing 10% v v$^{-1}$ methanol (MeOH). Tam oxidation was found to be most favorable using 0.1 mol L$^{-1}$ H$_{2}$SO$_{4}$. To investigate the mechanism, we performed chronoamperometry, CV at different scan rates, differential pulse anodic voltammetry (DPAV), and electrochemical impedance spectroscopy on tam-covered glassy carbon electrodes (GCEs). The electrode area, diffusion coefficient, and surface concentration ($\Gamma )$ of tam were calculated to be 0.062 cm$^{2}$, 3.65 $\times $ 10$^{-6}$ cm$^{2}$ s$^{-1}$, and 3.2 $\times $ 10$^{-10}$ mol cm$^{-2}$ respectively. Then the effects of different parameters …

Investigation Of The Photophysical And Photochemical Behavior Of Substituted Zinc Phthalocyanines And Their Water-Soluble Quaternized Derivatives, Gülsev Di̇lber, Mahmut Durmuş, Hali̇t Kanteki̇n

Turkish Journal of Chemistry

New nonperipherally and peripherally tetrasubstituted zinc(II) phthalocyanine complexes containing 1-benzylpiperidin-4-ol groups and their quaternized derivatives are reported in this work. These complexes were characterized successfully and their photophysical and photochemical properties were studied. These properties were determined in dimethylsulfoxide for all studied complexes and in water and water $+$ Triton X-100 solutions for ionic Zn(II) phthalocyanines. All studied zinc(II) phthalocyanine complexes generated high singlet oxygen, especially in dimethylsulfoxide, and these properties make them potential photosensitizers for use in the photodynamic therapy of cancer. The effects of the position and quaternization of the substituents on the photophysical and photochemical properties were …

Sociocultural Context And Determinants Of Treatments For Hemorrhoids Among The Nigerian Police, Oyo State Command, Abolaji Azeez, Uche C. Isiugo-Abanihe

Journal of Social, Behavioral, and Health Sciences

Hemorrhoids or piles, culturally known as Jedijedi among the people of southwestern Nigeria, are an anorectal disease surrounded by misconceptions. The consequences of these misconceptions are enormous. Therefore, the main objective of the present study is to understand the sociocultural explanation of piles among selected personnel of the Nigeria Police Force. We recruited 302 police officers for the exploratory survey through a multistage sampling technique. Five key informants were interviewed at the study area based upon their professions and proximity. Data interpretation was done through chi-square and content analysis. Results indicated a high prevalence (73%) of and misconceptions about hemorrhoids …

Representing And Inferring Mental Workload Via Defeasible Reasoning: A Comparison With The Nasa Task Load Index And The Workload Profile, Lucas Middeldorf Rizzo, Luca Longo

Conference papers

The NASA Task Load Index (NASA − TLX) and the Workload Profile (WP) are likely the most employed instruments for subjective mental workload (MWL) measurement. Numerous areas have made use of these methods for assessing human performance and thusly improving the design of systems and tasks. Unfortunately, MWL is still a vague concept, with different definitions and no universal measure. This research investigates the use of defeasible reasoning to represent and assess MWL. Reasoning is defeasible when a conclusion, supported by a set of premises, can be retracted in the light of new information. In this empirical study, this type …

Phytoplankton Plastid Proteomics: Cracking Open Diatoms To Understand Plastid Biochemistry Under Iron Limitation, Skyler J. Nunn, Phoebe Dreux Chappell, Kristofer Gomes, Anasthasia Bonderenko, Bethany D. Jenkins, Brook L. Nunn

OES Faculty Publications

Diatoms, such as Thalassiosira pseudonana, are important oceanic primary producers, as they sequester carbon dioxide (CO₂) out of the atmosphere, die, and precipitate to the ocean floor. In many areas of the world’s oceans, phytoplankton, such as diatoms, are limited in growth by the availability of iron (Fe). Fe is an essential nutrient for phytoplankton, as it is central in the electron transport chain component of photosynthesis. Through this study, we examined if Fe-limitation makes a significant difference in the proteins expressed within the chloroplast, the power source for diatoms. Here, we utilized a new plastid isolation technique specific …

Ladd Looking Forward - A Reading Group, Krystie Wilfong, Christina Bell

ILS Scholarship

In the summer of 2017, the staff of Ladd Library and Muskie Archives at Bates College embarked upon a semester-long, bi weekly reading group. Facing the upcoming search for new leadership, we spent the Fall 2017 semester discussing a broad array of topics relevant to the profession as a whole and what we might consider for our own future. We asked all participants to engage with a growth mindset, and set down rules to push the conversation beyond “this is the way we’ve always done it” as a justification against change.

Producing A College Graduate Using Retention, Progression, And Graduation (Rpg) Initiatives: A University Systems’ Approach, Deborah N. Kittrell-Mikell

College of Graduate Studies: Theses & Dissertations

ABSTRACT

Complete College Georgia (CCG) is an initiative that has the University System of Georgia institutions strategizing ways to develop plans that will increase the number of college graduates by the year 2020. Governor Nathan Deal has indicated that graduation rates need to increase from 42% to 60% within the next 7 years. With the anticipation of approximately 20% more students graduating to meet the 250,000 target, a closer look is needed at how an additional 50,000 graduates can be produced to make this goal a reality. To fulfill this goal, there needs to be an increase of approximately 7,143 …

Puzzled Representations: Popular Media And How Educators Come To Know Autism, Vanessa N. Keener

College of Graduate Studies: Theses & Dissertations

People learn about the world through popular culture. Popular culture media representations of autism can be found in TV, film, literature, Internet media, advertisements, and more. This study employed a quantitative correlational design to survey 273 Georgia educators regarding their perceptions of autism, including knowledge about autism, best practices for teaching students labeled as having autism, perceived positivity and accuracy of popular media representations of autism, as well as participant identification with popular media representations of autism and personal characteristics (i.e., age, sex, level of education, type of degree, years of teaching experience, professional and personal experiences). Six major findings …

Impact : Issue 10, Patients Behbud

IMPACT – The Aga Khan University Hospital Archives

Content

- Chairman's Message

- Look at the Difference We Made in 2016

- Straight From the Press : The Year in Images

- The Change of Kindness

2016-2017 Georgia Southern University Basketball Media Guide, Georgia Southern University

Men's Basketball Records

• Men's Basketball 2016-17

Variation In Larval Behavior Across The Ecologically Distinct Host Populations Of The Cactophilic Drosophila Mojavensis, Joshua Coleman

Theses

Ecological host shifts likely have a major impact on the evolution of species. The host shift can result in an organism being faced with significant chemical, nutritional, volumetric, and other challenges, which may lead to adaptation. Host shifts can lead to speciation by prezygotic isolation, and even reinforcement through postzygotic isolation. This study looks at behavioral differences in terms of larval activity in populations of Drosophila mojavensis which have experienced host shifts. The mean speed of the four populations of D. mojavensis larvae were measured, and considered in the ecological context. A single nucleotide polymorphism (SNP) DNA library was prepared …

Kinetic Analysis Of The Hypergolic Reactivity Of Dimethylpiperazines With Red Fuming Nitric Acid, Kenneth Haines

Theses

This research investigated the hypergolic reaction that occurs between dimethylpiperazines with red fuming nitric acid. An advanced laser diagnostic system was designed previously to measure chemical delay times. This equipment was utilized to study the effects of temperature, fuel to oxidizer ratio, the presence of dinitrogen tetroxide in the oxidizer and the presence of methanol in the fuel. A comparison was made with dimethylpiperazine isomers and derivatives of hydrazine previously studied.

Full Circle: The New Deal And The Great Recession, Donald Lewis Roberts

Honors College Theses

In this paper I will show how the mindset of liberalism has evolved since the Great Depression. It merged with progressive movement of the late 19^th and early 20^th centuries to become a politically left ideology that intertwined with power hungry politicians who perverted liberalism and used sudden economic and social phenomena to engineer a new type of American government. One that has constantly expanded, reaching and entrenching itself further and further into the lives of Americans, starting with President Franklin Roosevelt. Roosevelt’s work would be expanded in the name of progress and equality by several of his …

Individual Domestic Terrorism: An Analysis Of The Motivations And Radicalization Of Terrorism In The United States, Tony Hudson Jr.

Honors College Theses

Individual terrorist events have increased in the United States. What are the motivations behind these attacks and what led these individuals to participate in this form of political violence? In this paper, I provide a case study analysis of four domestic terrorist attacks in the United States that have been executed by individual perpetrators. I combine rational choice, sociological, and psychological theories in order to show a similar path of radicalization taken by each of the terrorists involved in these attacks. I build upon previous research on the importance of studying terrorism from an individual- analysis perspective.

Food Truck Viability; Watkinsville, Ga, David Beck

Georgia Municipal Association Practicum (2013-2022)

No abstract provided.

City Of Smyrna Citizens’ Academy Implementation Plan, Cindy Steinmann

Georgia Municipal Association Practicum (2013-2022)

No abstract provided.

Easing Cross-Border Communication: Mobile-Mediated Communication And Its Framework, Kyungsub Choi, Young Soo Kim

Research Collection School Of Computing and Information Systems

Communication is probably the most critical component of an organization engaged in a cross-border collaboration. Today’s smart devices substantially contribute to such communication. Combined with social media, mobile communication technologies are becoming the main platform for many core functions within organizations. In this paper, we identified seven media identifiable attributes: synchronicity (SYN), de-individuation and co-presence (DCP), accessibility readiness (ARD), cognizance of environment change (CEC), wearability-portability (WRB) modality-select (MDS) and visibility (VSB). These seven attributes significantly impact the course of mobile-mediated communication. We believe that development of a theoretical perspective that embraces the complexity of mobile-mediated communication is due in order …

Collaboration In Virtual Worlds: Impact Of Task Complexity On Team Trust And Satisfaction, Fiona Fui-Hoon Nah, Shu Schiller, Brian E. Mennecke, Keng Siau

Research Collection School Of Computing and Information Systems

Virtual worlds are three-dimensional, computer-generated worlds in which team collaboration can be facilitated through the use of shared virtual space and mediated using avatars. This article examines the effect of task complexity on team collaboration. A puzzle game in Second Life was used as the collaborative task and task complexity was manipulated by varying the number of pieces in the puzzle. The hypotheses are that task complexity influences team trust, and team trust influences team process satisfaction in virtual team collaboration. The experimental results indicate that task complexity has significant effects on team trust and team process satisfaction, and team …

Youth And Social Media: Power To Empower?, Sujith Kumar Prankumar

Research Collection School of Social Sciences

Much has been written on social media and how it has positively revolutionised communication and information transmission. The infl uence of social media is indubitable—it reaches anyone with an Internet connection, no matter their geographic location or socioeconomic status. This means information that was previously out of reach for isolated and less well-off communities is now accessible by more people than ever before. For example, University College London’s “Why We Post” social media anthropology project—conducted by nine researchers in nine different communities over 15 months—found that communities that have traditionally received comparatively lower levels of schooling now have access to …