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Simultaneous Determination Of Trace Sn(Ii) And Sn(Iv) Using Differential Pulse Polarography And Application, Güler Somer, Ülkü Ünal

Turkish Journal of Chemistry

A new method was established for the simultaneous determination of Sn(II) and Sn(IV) using differential pulse polarography (DPP). Among several electrolytes, 0.1 M NaOH in the presence of 0.1 M KNO_3 was found to be the most suitable one. In this medium, Sn(II) had 2 peaks, at -0.74 and -1.17 V, which were sharp and very sensitive. Sn(IV), on the other hand, had a very small peak at -0.92 V when its concentration was higher than 4.0 \times 10^{-4} M. Thus, it was decided to determine Sn(IV) after reduction into Sn(II). In the presence of both Sn(II) and Sn(IV), Sn(II) …

Synthesis And Spectral Characterization Of A Decavanadate/Chitosan Complex, Violeta Dimitrova Kassabova Zhetcheva, Lilyana Parvanova Pavlova

Turkish Journal of Chemistry

A decavanadate/chitosan complex was synthesized by crosslinking chitosan with decavanadate anions at a pH of 3. The materials were characterized by Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), absorption spectroscopy (UV-Vis), and transmission electron microscopy (TEM). The spectroscopic results indicated that the decavanadate/chitosan complex was successfully obtained as result of an ionic crosslinking of the chitosan with decavanadate anions.

Synthesis And Properties Of New Optically Active And Organosoluble Poly(Ester-Imide)S Containing L-Valine Moieties In The Main Chain By Direct Polycondensation Reaction, Khalil Faghihi, Meisam Shabanian, Mohsen Hajibeygi

Turkish Journal of Chemistry

New optically active poly(ester-imide)s (PEIs) containing bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic diimide in the main chain were prepared by the reaction of N,N'-(bicyclo[2,2,2]oct-7- ene-2,3,5,6-tetra carboxylic)-bis-L-valine 4 as a diacid monomer with various aromatic diols 5a-g in a system of tosyl chloride (TsCl), pyridine (Py), and N,N-dimethylformamide (DMF). The reactions with TsCl were significantly promoted by controlling alcoholysis with diols, in the presence of catalytic amounts of DMF, to give a series of optically active poly(ester-imide)s. The resulting new polymers were obtained in good yields and inherent viscosities, ranging between 0.36 and 0.62 dL g^{-1}, and were characterized with FT-IR and ^1H-NMR spectroscopy, including specific …

Synthesis And Anti-Helicobacter Pylori Activity Of (4-Nitro-1-Imidazolylmethyl)-1,2,4-Triazoles, 1,3,4-Thiadiazoles, And 1,3,4-Oxadiazoles, Asal Fallah-Tafti, Tahmineh Akbarzadeh, Parastoo Saniee, Farideh Siavoshi, Abbas Shafiee, Alireza Foroumadi

Turkish Journal of Chemistry

A series of [(4-nitro-1H-imidazol-1-yl)methyl]-1,2,4- triazoles and 1,3,4-thiadiazoles were prepared and evaluated for their activity against sensitive and resistant H. pylori strains. Study of the structure-activity relationship of these series of compounds indicated that the type of nitroimidazole moiety and the pendent group on the heteroaryl analog dramatically impact the anti-H. pylori activity. In triazole series, compound 5d, containing a 4-methyl phenyl group on the triazole ring, was the most potent compound tested against both metronidazole-sensitive and -resistant strains at a concentration of 8 \mu g.

Assimilable Organic Carbon Generation From Algogenic Organic Matter In Drinking Water, Ji-Hoon Kim, Young-Ju Kim, Tahir Imran Qureshi

Turkish Journal of Chemistry

A study of assimilable organic carbon (AOC) derived from algogenic organic matter in different drinking water resources was conducted. Seasonal changes in the concentration of AOC at Kamafusa Dam were dependent on the algal cell numbers. Variations in AOC concentrations were found to be more reliant on the AOC-P17 component than the AOC-NOX component. The algal culture experiment showed that extracellular organic matter (EOM) released during the growth of Phormidium tenue in M-11 culture medium led to a significant increase in AOC concentration; however, no significant variations of AOC concentration were observed in CT culture medium containing high amounts of …

Voltammetric Behavior Of Indole-3-Acetic Acid And Kinetin At Pencil-Lead Graphite Electrode And Their Simultaneous Determination In The Presence Of Anionic Surfactant, Yavuz Yardim, Zühre Şentürk

Turkish Journal of Chemistry

A method was developed for the simultaneous determination of indole-3-acetic acid (IAA) and kinetin, based on the oxidation of both phytohormones at a pencil-lead graphite electrode. The electrochemical behaviors were examined by cyclic, linear sweep, and square-wave voltammetry in the pH range of 2-12. In Britton-Robinson buffer solution (pH 6), the oxidation peaks of IAA and kinetin are well separated by square-wave voltammetry. By adding an anionic surfactant (sodium dodecylsulfate) in a concentration of 50 \mu M, the sensitivity of kinetin was increased significantly without reducing the resolution. The detection limits were 0.14 and 0.11 \mu M (24.53 and 23.67 …

Electrocatalytic Oxidation Of Ethanol On Various Metal Ad-Layer Modified Au(111) Electrodes In Alkaline Solution, Zekerya Dursun, Şükri̇ye Ulubay Karabi̇beroğlu, Buket Gelmez, Aydan Başaran

Turkish Journal of Chemistry

Ethanol oxidation was studied on single-crystal Au(111) electrodes that were modified by platinum, palladium, and cadmium metal ad-layers. The metal ad-layer modification was carried out by the underpotential deposition process, in which controlled amounts of Pt, Pd, and Cd were electrodeposited onto the substrate as submonolayer or monolayer coverage. The activity of the metal ad-layer modified Au(111) electrodes toward ethanol oxidation was studied in alkaline media, and recorded voltammograms were compared to those of bare single crystal Au(111) and polycrystalline gold and platinum disk electrodes. In terms of the desired shift in reduction potential and increased current density, the best …

Enantioselective Henry Reaction Catalyzed By A Novel L-(+)-Aspartic Acid-Derived Schiff Base Ligand And Cu(Ii) Ion, Gamze Koz, Demet Astley, Stephen Thomas Astley

Turkish Journal of Chemistry

Mild and efficient enantioselective Henry reactions of nitromethane with various aldehydes were catalyzed by a novel L-(+)-aspartic acid-derived Schiff base ligand in the presence of Cu(II) ions, affording the corresponding adducts in high yields (up to 96%) and enantioselectivities (up to 92% ee).

Electrochemical Impedance Spectroscopy Study On Intercalation And Anomalous Diffusion Of Alcl_4^- Ions Into Graphite In Basic Molten Salt, Ali Ehsani, Mohammad Ghasem Mahjani, Majid Jafarian

Turkish Journal of Chemistry

Electrochemical impedance spectroscopy (EIS) was employed to investigate diffusion of AlCl_4^- ions in basic (AlCl_3-NaCl-KCl) molten salt. Nyquist plots in different DC offset potentials showed finite and restricted aluminum ion diffusion due to insertion and blocking in the graphite electrode. The general Warburg, open Warburg, and short Warburg impedance in the complex Nyquist plot of this system showed the anomalous diffusion behavior of the ions in the graphite electrode. The diffusion coefficient of the AlCl_4^- ions was calculated from the slope of the Warburg line in a totally blocking film in the graphite electrode and was found to be 2.8 …

Synthesis Of Starch-G-Poly(Acrylic Acid-Co-2-Hydroxy Ethyl Methacrylate) As A Potential Ph-Sensitive Hydrogel-Based Drug Delivery System, Mohammad Sadeghi

Turkish Journal of Chemistry

The present work focused on the design of a drug delivery system (DDS) based on pH-sensitive hydrogel. The hydrogels were prepared via graft copolymerization of mixtures of acrylic acid (AA) and 2-hydroxy ethyl methacrylate (HEMA) onto starch backbones by a free radical polymerization technique. Sodium bicarbonate (NaHCO_3) was added to function as a foaming agent under acidic conditions, rendering the hydrogels to be porous. The porous structure of the hydrogel was essential in this system to yield a large surface area so that 5-fluorouracil (5-FU) release could be facilitated. The hydrogel, thus prepared, possessed a porous structure as determined by …

Electrocatalytic Oxidation Of Methanol At Pd And Pt Ad-Layer Modified Au(111) Electrodes In Alkaline Solution, Süleyman Koçak, Zekerya Dursun, Fatma Ni̇l Ertaş

Turkish Journal of Chemistry

The electrochemical oxidation of methanol was investigated by using various ad-layer modified Au(111) electrodes in alkaline media in comparison to Au(111), polycrystalline Pd, and polycrystalline Pt electrodes. Catalytic activity of gold toward methanol oxidation has tended to increase in more alkaline media, as reflected in the oxidation peak in the concentration range of NaOH (0.1-3.0 M) studied here. The oxidation peak potential of methanol shifted to more negative potentials, indicating a pH-dependent surface reaction. Among the electrodes studied, single-crystal gold electrode surfaces modified with Pd and Pt ad-layers displayed the highest catalytic activity for methanol oxidation. Additional shifts of about …

A New And Simple Procedure For The Polarographic Speciation And Determination Of Trace Inorganic As(Iii) And As(V) Species, Ülkü Ünal, Güler Somer

Turkish Journal of Chemistry

A new and simple differential pulse polarographic method was developed for the trace determination of As(III) and As(V) species in the same sample. Among several electrolytes, 0.1 M HCl was found to be the most suitable. As(III) had 3 peaks in this medium, and the peak at --0.82 V was chosen because of its peak shape and response to standard additions. In this medium, the limit of detection for As(III) was found to be 1.5 \times 10^{-7} M. Since As(V) is not electroactive, it had to be reduced first into As(III). For this purpose, KI in an acidic and hot …

The Sorption Of Cadmium(Ii) Ions On Mercerized Rice Husk And Activated Carbon, Mas Rosemal Hakim Mas Haris, Nor Aimi Abdul Wahab, Chong Wan Reng, Baharin Azahari, Kathiresan Sathasivam

Turkish Journal of Chemistry

This work describes the removal of Cd(II) ions in aqueous solution by unmodified and base-modified rice husk (RH) as compared to that by activated carbon (AC). Mercerization of RH was carried out by using dilute solutions (0.013 M) of NaOH, KOH, and Ca(OH)_2. The experiments were conducted in duplicate under 1-batch and 2-batch treatments. In the 1-batch treatment, a fresh 200 mg of each adsorbent was used to study the sorption of the Cd(II) ions from 100-mL solutions at an initial concentration of 5 mg L^{-1}. The adsorption percentage increased in the order of unmodified RH (80.13 \pm 0.46%) < Ca(OH)_2-modified RH (90.74 \pm 0.18%) < NaOH-modified RH (93.36 \pm 0.23%) \le KOH-modified RH (93.78 \pm 0.27%) < AC (98.4 \pm 0.18%). In the 2-batch treatment, a fresh 100 mg of each adsorbent was placed in 100-mL solutions at an initial concentration of 5 mg L^{-1} of Cd(II) ions for 30 min, and the resulting solutions were filtered. The filtrates were subjected to another fresh 100 mg of each adsorbent for an additional 30 min. The percentage removal of the metal ion using the 2-batch treatment for unmodified RH, base-modified RH, and AC was 97.71%, 98.00 \pm 1.00%, and nearly 100%, respectively.

Determination Of Ni(Ii) With Picolinaldehyde-4-Phenyl-3-Thiosemicarbazone Used As A Chromogenic Reagent In A Nonionic Micellar System, Aamna Balouch, Muhammad Iqbal Bhanger, Farah Naz Talpur, Willie L. Hinze

Turkish Journal of Chemistry

Spectrophotometric determination of Ni(II) was carried out using picolinaldehyde-4-phenyl-3-thiosemicarbazone (PAPT) as a complexing/chromogenic reagent. The possibility of using a micellar system was explored to enhance the degree of detection and allow a more sensitive spectrophotometric method for the determination of nickel ions. The anionic surfactant Triton X-100 greatly enhanced the molar absorptivity and limit of detection relative to that observed with bulk water or an organic solvent. The linear calibration graphs were obtained for 0.5-2.0 mg L^{-1} and 0.001-1.0 mg L^{-1} of Ni(II) in aqueous and surfactant media, respectively. Using this approach, the limit of detection for the PAPT-Ni(II) complex …

Does Talking The Talk Help Walking The Walk? An Examination Of The Effect Of Vocal Attractiveness In Leader Effectiveness , Timothy Degroot, Federico Aime, Scott G. Johnson, Donald Kluemper

Business Faculty Publications

The authors tested the hypothesis that leaders' vocal attractiveness is positively related to perceptions of leadership effectiveness. In a first study using vocal spectral analysis on a sample of U.S. presidents and Canadian prime ministers, vocal attractiveness accounted for significant variance in historians' perceptions of leadership effectiveness (β = .35, p < .05), explaining an additional 12% of the variance above that explained by personality, motives, and charisma. A second study of 255 subjects distributed into 85 teams in a laboratory setting found similar results for the relationship between vocal attractiveness and perceptions of leadership effectiveness. The second study also supported the hypothesis that personal reactions mediate the relationship between vocal attractiveness and perceptions of leadership effectiveness. In contrast, vocal attractiveness and personal reactions were found to have no significant effects on leadership effectiveness outcomes.

Weighted And Filtered Mutual Information: A Metric For The Automated Creation Of Panoramas From Views Of Complex Scenes, Thomas Keane

Theses

To contribute a novel approach in the field of image registration and panorama creation, this algorithm foregoes any scene knowledge, requiring only modest scene overlap and an acceptable amount of entropy within each overlapping view. The weighted and filtered mutual information (WFMI) algorithm has been developed for multiple stationary, color, surveillance video camera views and relies on color gradients for feature correspondence. This is a novel extension of well-established maximization of mutual information (MMI) algorithms. Where MMI algorithms are typically applied to high altitude photography and medical imaging (scenes with relatively simple shapes and affine relationships between views), the WFMI …

A Study Of Poly Lactic Acid Bio-Polymer For Cereal Packaging, George Tuszkiewicz

Theses

The aim of this research has provided a technical framework for evaluating Co-Ex film structures of Poly Lactic Acid (PLA) and High Density Polyethylene (HDPE) for Ready to Eat (RTE) cereal primary packaging. This was accomplished through increased percentages of PLA content in each identified film candidate. The foundation for this research is that Bio Polymers are gaining market popularity as a result of the increasing world demand on plastics. As a result of plastics high market volatility and the strain on fossil fuel it has created focused research on Bio Polymers. However, it is widely known there are intrinsic …

Feasibility Of A Non-Invasive Wireless Blood Glucose Monitor, Benjamin Freer

Theses

Blood glucose monitors are critical to diabetes management. Many new noninvasive measurement techniques are being investigated. The present work focuses on the possibility of a monitor that non-invasively measures blood glucose levels using electromagnetic waves. The technique is based on relating a monitoring antenna's resonant frequency to the permittivity and conductivity of blood which in turn is related to the glucose levels. At first a realistic data base for the dielectric properties of blood has been established through in-vitro measurements performed on blood samples obtained from 20 patients with glucose levels ranging from normal (87 mg/dl) to hyperglycemic (330 mg/dl). …

Development Of Low Temperature Oxidation For Crystalline Silicon Thin Film Transistor Applications, Ryan Rettmann

Theses

Development of thin-film transistor (TFT) backplane technologies has traditionally been limited by the substrate materials used; amorphous (a-Si) or polycrystalline (p-Si) silicon on glass. These materials have lower carrier mobility as compared to traditional crystalline silicon CMOS technologies, resulting in performance limitations. In addition, thermal oxidation is not a viable option for two reasons: oxidation on non-crystalline silicon is non-uniform, and the temperature limitations of the glass, 600 °C, prevents any appreciable SiO2 growth. This constrains the potential for a high-quality Si-SiO2 interface necessary for aggressive scaling. Corning Incorporated has developed a new Silicon-on-Glass (SiOG) substrate material addressing some of …

Page Layout Analysis And Classification In Complex Scanned Documents, Mustafa Erkilinc

Theses

Page layout analysis has been extensively studied since the 1980`s, particularly after computers began to be used for document storage or database units. For efficient document storage and retrieval from a database, a paper document would be transformed into its electronic version. Algorithms and methodologies are used for document image analysis in order to segment a scanned document into different regions such as text, image or line regions. To contribute a novel approach in the field of page layout analysis and classification, this algorithm is developed for both RGB space and grey-scale scanned documents without requiring any specific document types, …

Cascading Migrations And Implications For Vertical Fluxes In Pelagic Ecosystems, Stephen M. Bollens, Gretchen Rollwagen-Bollens, Joel A. Quenette, Alexander B. Bochdansky

OES Faculty Publications

Diel vertical migration is widespread across diverse taxa in the world's lakes and seas, yet its biogeochemical consequences are still poorly understood. The biologically mediated vertical flux of material in the ocean (also known as the "biological pump") is a matter of major interest and concern, as it is thought to play an important role in regulating ocean carbon storage, and by extension, the global carbon cycle. Recent studies spanning multiple trophic levels from fish to dinoflagellates have led us to a concept of coupled vertical migrations that we refer to as "cascading migrations". That is, migrations that …

Experiences And Perceptions Of Pregnant Unmarried Adolescent Girls In Nigeria, Priscilla N. Asonye

Walden Dissertations and Doctoral Studies

Sexual activity among unmarried adolescents is a major public health problem in Nigeria, because unmarried pregnant girls are more likely to have multiple sex partners and are less likely to use contraceptives, putting them at greater risk for sexually transmitted diseases (STD), unplanned pregnancy, abortion, social isolation, and poverty. Teen pregnancy and STD rates are on the rise in Nigeria, yet few data exist on the experience of the adolescents themselves. This phenomenological study was designed to explore the in-depth experiences of 10 pregnant, unmarried adolescent girls aged 16-19, including the factors contributing to their sexual activity. An ecological model …

An Analysis Of The Million Module March Algorithm Applied To The Atron Robotic Platform, James Phipps

Theses

The Million Module March algorithm is a locomotion planning algorithm for self-reconfiguring robotic systems. It was first introduced by Robert Fitch and Zack Butler. It has already been proven to successfully plan movement for a kinematic abstraction whose traits are very different from the kinematic traits of the ATRON system. In this work we further examine this algorithm, and an adaptation of it to the ATRON robotic system. We examine a two dimensional proof of the reachability of connected configurations of sliding squares, and expand the proof to the three dimensional SlidingCube model of a self-reconfiguring robot. Using this proof, …

Financial Planning For The Future Of The Kosovo Security Force 2013-2018 : [Presentation Given On November 16, 2011], Shqipe Jashari

Theses

After the declaration of Kosovo’s independence on 17th February 2008, new institutions including the Ministry for the Kosovo Security Force (MKSF) and the Kosovo Security Force (KSF) were formed. This capstone project has assessed the financial obstacles and challenges confronting the MKSF. It considered the future financial planning after the Ahtiaaris Plan for Kosovo 2013 -2018, and offers potential alternatives for solving the growing strategic and financial needs.

Road Infrastructure Development And Investment In Kosovo : [Presentation Given November 17, 2010], Vedat Jashari

Theses

After decades of rule under the socialist system and after two years of war, in 1999, Kosovo was one of the countries in Europe with the most undeveloped and underinvested road infrastructure. Despite, the increased investments in road infrastructure, in the recent post-war years, it still lacks behind in comparison to the regional and European countries. The under-investment and poor road infrastructure network has severe consequences for the overall economic development in increasing unnecessary costs, impeding time productivity, road safety and so forth. However, Kosovo’s network has good potential for development ... The recommendations resulting from the various analyses and …

Draft Genome Sequence Of Strain Himb100, A Cultured Representative Of The Sar116 Clade Of Marine Alphaproteobacteria, Jana Grote, Cansu Bayindirli, Kristin Bergauer, Paula C. De Moraes, Huan Chen, Lindsay D'Ambrosio, Bethany Edwards, Beatriz Fernandez-Gomez, Mariam Hamisi, Dan Nguyen, Yoshimi M. Rii, Emily Saeck, Charles Schutte, Brittany Widner

OES Faculty Publications

Strain HIMB100 is a planktonic marine bacterium in the class Alphaproteobacteria. This strain is of interest because it is one of the first known isolates from a globally ubiquitous clade of marine bacteria known as SAR116 within the family Rhodospirillaceae. Here we describe preliminary features of the organism, together with the draft genome sequence and annotation. This is the second genome sequence of a member of the SAR116 clade. The 2,458,945 bp genome contains 2,334 protein-coding and 42 RNA gene

Characterization Of Putative Iron Responsive Genes As Species-Specific Indicators Of Iron Stress In Thalassiosiroid Diatoms, Leann P. Whitney, Jeremy J. Lins, Margaret P. Hughes, Mark L. Wells, P. Dreux Chappell

OES Faculty Publications

Iron (Fe) availability restricts diatom growth and primary production in large areas of the oceans. It is a challenge to assess the bulk Fe nutritional health of natural diatom populations, since species can differ in their physiological and molecular responses to Fe limitation. We assayed expression of selected genes in diatoms from the Thalassiosira genus to assess their potential utility as species-specific molecular markers to indicate Fe status in natural diatom assemblages. In this study, we compared the expression of the photosynthetic genes encoding ferredoxin (a Fe-requiring protein) and flavodoxin (a Fe-free protein) in culture experiments with Fe replete and …

Discrimination Of Surface And Volume States In Fully Depleted Field-Effect Devices On Thick Insulator Substrates, Robert Manley

Theses

The behavior of electronic devices fabricated on thin, lightly doped semiconductor layers can be significantly influenced by very low levels of non-ideal charge states. Such devices typically operate in a fully depleted mode, and can exhibit significantly different electrical properties and characteristics than their bulk material counterparts. Traditional interpretation of device characteristics may identify the existence of such non-idealities, but fail to ascertain if the origin is from within the semiconductor layer or associated with the interfaces to adjacent dielectric materials. This leads to ambiguity in how to rectify the behavior and improve device performance. Characterizing non-idealities through electrical means …

2011 Georgia Southern Football Full Media Guide, Georgia Southern University

Men's Football Records

• 30 Years of Football
• Georgia Southern Football 2011 Media Information Guide

Competition. Ethics. Management, Alojzy Z. Nowak, Beata Glinka, Przemysław Hensel

Monografie/Monographs

No abstract provided.