Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2016

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 37651 - 37680 of 38603

Full-Text Articles in Entire DC Network

Breastfeeding Education For Women With Diabetes, Pregnancy-Induced Hypertension And Multiple Gestations, Oluwapelumi Adefunmike Adeboyejo Jan 2016

Breastfeeding Education For Women With Diabetes, Pregnancy-Induced Hypertension And Multiple Gestations, Oluwapelumi Adefunmike Adeboyejo

Walden Dissertations and Doctoral Studies

Breastfeeding is considered a public health concern due to increased maternal/infant mortality and morbidity rates associated with persistent low rates in breastfeeding. Providing early breastfeeding education for women with diabetic, pregnancy-induced hypertension and multiple gestations can result in higher persistence rates and a decrease in maternal and infant mortality and morbidity rates. This quality improvement project provided early prenatal breastfeeding education for women with diabetes, pregnancy-induce hypertension and multiple gestations at a private clinic in Long Beach, Southern California. Evidence-based literature reviews were conducted through CINAHL and Medline (2009-2014). The descriptive study used for the project was made up questionnaires …

Go to article

Executive Management Methods To Prepare Employees For Future Positions, Pheobie Latossa Coleman Jan 2016

Executive Management Methods To Prepare Employees For Future Positions, Pheobie Latossa Coleman

Walden Dissertations and Doctoral Studies

Creating successful leaders is one of the challenges that social services organizations are facing. Employees may lack essential managerial skills to become productive leaders, and some managers may lack viable succession planning methods for preparing employees for leadership positions. The purpose of this case study was to explore methods that executive managers use to prepare employees for leadership positions. Path-goal theory and transformational leadership represent the conceptual framework that grounded this study. Semistructured interviews were conducted with 10 executive managers in the social services industry within southwest Georgia with experiences and skills specific to implementing successful succession planning. Company archives …

Go to article

Strategies Small Restaurant Owners Use To Reduce Food Waste And Increase Profits, Fabian Lusichi Makani Jan 2016

Strategies Small Restaurant Owners Use To Reduce Food Waste And Increase Profits, Fabian Lusichi Makani

Walden Dissertations and Doctoral Studies

There were 133 billion pounds of food that went to waste in the United States in 2014, leading to $161.6 billion in economic loss. Of this waste, 89 billion pounds occurred in restaurants and other food service facilities. A case study was used to explore the strategies small, independent, family-owned restaurants owners used to reduce food waste. Four small independent, family-owned restaurants owners located in the Washington, DC, metro area participated in the study. These owners were selected based on their revenue and years of survival. Stakeholders theory was the conceptual framework in which the study was grounded. Face-to-face interviews …

Go to article

A Policy Analysis Of California Veterans Treatment Court Legislation, Larisa Elisabeth Owen Jan 2016

A Policy Analysis Of California Veterans Treatment Court Legislation, Larisa Elisabeth Owen

Walden Dissertations and Doctoral Studies

Veterans treatment courts (VTCs) and agencies that work with veterans experiencing posttraumatic stress and substance use disorders have been unable to provide evidence-based treatment that includes veterans' families in recovery and treatment. This limitation has resulted in treatment gaps that appear to have had an adverse impact on veterans and their families. The purpose of this qualitative content analysis was to examine the formulation of AB 2371, a 2012 legislative amendment to California code PC 1170.9, and evaluate whether lawmakers considered family-oriented treatment in passing the amendment. Schneider and Ingram's theory of social construction of target populations constituted the theoretical …

Go to article

Managing To Clear The Air: Stereotype Threat, Women, And Leadership, Crystal L. Hoyt, Susan E. Murphy Jan 2016

Managing To Clear The Air: Stereotype Threat, Women, And Leadership, Crystal L. Hoyt, Susan E. Murphy

Jepson School of Leadership Studies articles, book chapters and other publications

In this article, we explore the process and implications of stereotype threat for women in leadership, broadly construed. First, we provide a brief background on the phenomenon of stereotype threat generally. Next, we explore stereotype threat for women in leadership by reviewing a model of stereotype threat in leadership contexts that includes cues to stereotype threat, consequences of stereotype threat, and moderators of stereotype threat appraisals and responses. In this review, in addition to considering research focused squarely on leadership, we include the broader categories of research examining stereotype threat effects in the workplace and in tasks and domains relevant …

Go to article

Exploring Barriers To Women Entrepreneurs In Enugu State, Nigeria, Ezenwayi Amaechi Jan 2016

Exploring Barriers To Women Entrepreneurs In Enugu State, Nigeria, Ezenwayi Amaechi

Walden Dissertations and Doctoral Studies

Women play an important role in the development of their families and communities economically; however, in comparison to men, they disproportionately experience barriers such as low income households, poverty, unemployment, lack of training, and discrimination. The purpose of this mini-ethnographic case study was to explore the perceptions of women entrepreneurs in Enugu State, Nigeria on what information they need to overcome possible barriers in their business and economic development. The 5M (market, money, management, motherhood, meso, and microenvironment) framework provided the theoretical lens for this investigation. The data gathering process involved face-to-face semistructured interviews with 15 women entrepreneurs in 3 …

Go to article

Understanding Caregivers' Perceptions Of Childhood Immunization, Oliver Anyabolu Jan 2016

Understanding Caregivers' Perceptions Of Childhood Immunization, Oliver Anyabolu

Walden Dissertations and Doctoral Studies

Low immunization in Nigeria is associated with high prevalence of childhood diseases. The purpose of this qualitative phenomenological study was to describe caregivers' perceptions of routine immunization of their children ages 24 to 36 months. Caregivers' attitudes, cultural beliefs, and knowledge regarding immunization were examined. The health belief model was used to guide study. Interviews were conducted with 5 caregivers of fully immunized and 5 caregivers of partially and nonimmunized children. Digital recordings were analyzed using NVivo 10 to identify themes and subthemes. Attitudes of caregivers with fully immunized children included both perceived barriers (distance to health center, lack of …

Go to article

Marketing Strategies Used By Franchise Small Businesses To Retain Customers, Hilda Jordan Arline Jan 2016

Marketing Strategies Used By Franchise Small Businesses To Retain Customers, Hilda Jordan Arline

Walden Dissertations and Doctoral Studies

Franchised small businesses will not survive their first 5 years if they cannot implement marketing strategies that appeal to their customers. The purpose of this multiple case study was to explore the marketing strategies that successful franchise small business leaders used to retain customers. The population comprised 4 business leaders at franchise small businesses in North Carolina. Competitive advantage theory and blue ocean theory grounded this study. Data were collected using semistructured face-to-face interviews and review of company marketing materials. Data were thematically analyzed, and 6 themes emerged: personalization of customer service, market segmentation, innovative advertising, networking, brand identity, and …

Go to article

Social Stereotyping And Self-Esteem Of Miss America Pageant Contestants, Ebony Bowers Jan 2016

Social Stereotyping And Self-Esteem Of Miss America Pageant Contestants, Ebony Bowers

Walden Dissertations and Doctoral Studies

Miss America Pageant contestants (MAPCs) have been negatively stereotyped socially for their perceived lack of intelligence and nonconformance to feminist gender stereotypes of women. Stereotypes could affect an individual's social psyche and establish stigma, which could prevent a group from achieving their full potential. Stereotypes could also result in women having mental health disorders, low self-esteem, a decrease in self-efficacy, body image dissatisfaction, and eating disorders. The problem this study addressed was that women who participate in the Miss America Organization (MAO) preliminary pageants risk social stigma for taking part in a seemingly nonfeminist activity. Intercultural communication research (ICR) was …

Go to article

A Qualitative Phenomenological Study Of Employee Perceptions Of The Impact Of Layoffs, Linda Carrington Jan 2016

A Qualitative Phenomenological Study Of Employee Perceptions Of The Impact Of Layoffs, Linda Carrington

Walden Dissertations and Doctoral Studies

Millions of Americans were terminated from their employment in massive layoffs in 2013, which not only created outrage among employees. but also opened the door for retaliatory lawsuits. However, profitable companies are still engaged in restructuring and layoffs, which have a negative effect on employees, managers, and survivors. Such actions create mistrust in management and continue to plague the workforce and the economy. The purpose of this phenomenological study was to explore the impacts that layoffs and downsizing have on employees' trust, work performance, behavior, and health. Informed by Sarker's theory on management and employee trust, the research questions explored …

Go to article

Effects Of Acculturation Gap And Attachment Style On South Asian Adolescent Well-Being, Malliga Delaney Delaney Jan 2016

Effects Of Acculturation Gap And Attachment Style On South Asian Adolescent Well-Being, Malliga Delaney Delaney

Walden Dissertations and Doctoral Studies

South Asian (SA) adolescents experience the added challenges of identity development and coping as a minority population of color in a predominantly White host culture. Adolescent attachment style (AS) with their parents, along with an acculturation gap (AG) with their parents, can either add to or alleviate their struggles. A matched acculturation style and secure AS with their parents were hypothesized to result in higher ethnic identity and adaptive coping. The Brief COPE, Multiethnic Identity Measure, Inventory of Parent and Peer Attachment, and the Bicultural Inquiry Questionnaire were used to measure the independent (AG and AS) and dependent variables (identity …

Go to article

Marketing Strategies For Increasing Latino Enrollment In Higher Education, Melissa Rocio Gomez De La Fuente Jan 2016

Marketing Strategies For Increasing Latino Enrollment In Higher Education, Melissa Rocio Gomez De La Fuente

Walden Dissertations and Doctoral Studies

Many leaders of higher education institutions in the United States face changes in student demographics, tightened regulatory environments, and reduced state funding. University leaders have an opportunity to leverage targeted marketing strategies in order to increase their institutions' market share in the Latino student segment. The purpose of this study was to explore the strategies that some university leaders use to increase Latino student enrollment in higher education programs. The marketing mix and the Ps of marketing theory comprised the study's conceptual framework. Semistructured interviews were conducted with 3 marketing experts from the higher education sector, who were selected by …

Go to article

Lived Experiences Of Exonerated Individuals 1 Year Or Longer After Release, Claudette M. Grooms Jan 2016

Lived Experiences Of Exonerated Individuals 1 Year Or Longer After Release, Claudette M. Grooms

Walden Dissertations and Doctoral Studies

The majority of information related to the postprison experiences of exonerated individuals is frequently found in reports by journalists, or based on the findings of scholars on systematic factors that contribute to wrongful incarcerations. There is a lack of social science research on the unexplored meanings and essence of the postprison lived experiences of exonerees exclusively from their perspectives. The purpose of this phenomenological study was to understand and describe the postprison lived experiences of exonerated individuals, 1 year or longer after their prison release. The conceptual framework was guided by Tajfel's social identity theory and Becker's social reaction theory. …

Go to article

The Aesthetic Experience, Flow, And Smart Technology: Viewing Art In A Virtual Environment, Carol Ikard Jan 2016

The Aesthetic Experience, Flow, And Smart Technology: Viewing Art In A Virtual Environment, Carol Ikard

Walden Dissertations and Doctoral Studies

Smart technology can support art educators and museum professionals in mediating the aesthetic experience. It can also increase museum attendance, enrich the viewer's delight and engagement with artworks and art collections, and provide an avenue for extending art on a global level. The purpose of this study was to determine the extent to which a mobile art app with text-based narrative influences scores on an aesthetic experience questionnaire. This quantitative research measured the difference in pretest and posttest human-computer interaction scores on the Aesthetic Experience Questionnaire Form after participants used two versions of a mobile art app. Csikszentmihalyi's flow was …

Go to article

Electrochemistry-Coupled To Mass Spectrometry In Simulation Of Metabolic Oxidation Of Methimazole: Identification And Characterization Of Metabolites, Kudzanai Chipiso, Reuben H. Simoyi Jan 2016

Electrochemistry-Coupled To Mass Spectrometry In Simulation Of Metabolic Oxidation Of Methimazole: Identification And Characterization Of Metabolites, Kudzanai Chipiso, Reuben H. Simoyi

Chemistry Faculty Publications and Presentations

Methimazole (MMI), an antithyroid drug, is associated with idiosyncratic toxicity. Reactive metabolites resulting from bioactivation of the drug have been implicated in these adverse drug reactions. Mimicry of enzymatic oxidation of MMI was carried out by electrochemically oxidizing MMI using a coulometric flow-through cell equipped with a porous graphite working electrode. The cell was coupled on-line to electrospray ionization mass spectrometry (EC/ESI-MS). ESI spectra were acquired in both negative and positive modes. In acidic medium, ESI spectral analysis showed that the dimer was the main product, while in neutral and basic media, methimazole sulfenic acid, methimazole sulfinic acid and methimazole …

Go to article

A Machine Learning Classifier For Corporate Opportunity Waivers, Gabriel V. Rauterberg, Eric L. Talley Jan 2016

A Machine Learning Classifier For Corporate Opportunity Waivers, Gabriel V. Rauterberg, Eric L. Talley

Faculty Scholarship

Rauterberg & Talley (2017) develop a data set of “corporate opportunity waivers” (COWs) – significant contractual modifications of fiduciary duties – sampled from SEC filings. Part of their analysis utilizes a machine learning (ML) classifier to extend their data set beyond the hand-coded sample. Because the ML approach is likely unfamiliar to some readers, and in the light of its great potential across other areas of law and finance research, this note explains the basic components using a simple example, and it demonstrates strategies for calibrating and evaluating the classifier.

Go to article

Research Symposium Program [2016], Georgia Southern University Jan 2016

Research Symposium Program [2016], Georgia Southern University

GS4 Student Scholars Symposium

No abstract provided.

Go to article

Osgoode Syllabus Of Courses And Seminars: 2016 - 2017, Office Of Student Services Jan 2016

Osgoode Syllabus Of Courses And Seminars: 2016 - 2017, Office Of Student Services

Syllabi

No abstract provided.

Go to article

Henderson News 4.2, Lori Gwinett, Kay Coates, Ashley Lowery, Katrina E. Jackson Jan 2016

Henderson News 4.2, Lori Gwinett, Kay Coates, Ashley Lowery, Katrina E. Jackson

Library Publications (1999-2023)

In this Issue: Latino Americans: The 500 Year Legacy That Reshaped History, What's Your Favorite Book? (National Day of Writing), New Faculty Profile: Kay Coates, Zach's Sustainable Seeds, Open Access Week, Star Wars: Cover to Cover: The Exhibit

Go to article

Adsorptive Features Of Polyacrylamide--Aluminosilicate Composites For Methylene Blue, Demet Baybaş, Ulvi̇ Ulusoy Jan 2016

Adsorptive Features Of Polyacrylamide--Aluminosilicate Composites For Methylene Blue, Demet Baybaş, Ulvi̇ Ulusoy

Turkish Journal of Chemistry

Polyacrylamide--montmorillonite (PAAm-Mt) and polyacrylamide--clinoptilolite (PAAm-Z) composites were prepared by cross-linked polymerization of acrylamide in dispersions of Mt and Z. The composites were characterized by FT-IR, SEM, XRD, CEC, and PZC analysis. The adsorptive features of PAAm-Mt and PAAm-Z for methylene blue (MB) were investigated by their relevance to initial dye concentration, temperature, contact time, PZC, and pH. The monolayer adsorption capacities were 0.14 and 0.08 mol kg$^{-1}$ for PAAm-Z and PAAm-Mt, respectively. The changes in pH of MB solution had an insignificant influence on their adsorption capacities. The values of enthalpy and entropy changes were positive ($\Delta $H$_{PAAm-Mt}$ = 7.6 …

Go to article

Enhanced Delivery Of Epirubicin By Polyoxometalate-Based Magnetic Nanocarriers: Controlled Drug Loading And Ph-Sensitive Drug Release, Ezzat Rafiee, Nasibeh Rahpeyma Jan 2016

Enhanced Delivery Of Epirubicin By Polyoxometalate-Based Magnetic Nanocarriers: Controlled Drug Loading And Ph-Sensitive Drug Release, Ezzat Rafiee, Nasibeh Rahpeyma

Turkish Journal of Chemistry

A series of polyoxometalate-based magnetic nanoparticles were developed as novel carriers for anticancer drugs. Characterization of the nanoparticles was done by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), wavelength dispersive X-ray (WDX), and laser particle size analyzer. Epirubicin (EPI) was selected as a model drug. EPI loading efficiency, EPI loading content, and EPI release profiles were studied. Drug loading was controlled using acid-base titration since H$^{+}$ was released during the loading process. Based on these investigations, an efficient EPI delivery system was introduced. It showed high EPI-loading capacity (35.2 wt.{\%}) and high EPI loading …

Go to article

Immobilization Of Laccase Onto A Porous Nanocomposite: Application For Textile Dye Degradation, Sedef İlk, Deni̇z Demi̇rcan, Semran Sağlam, Necdet Sağlam, Zakir M. O. Rzayev Jan 2016

Immobilization Of Laccase Onto A Porous Nanocomposite: Application For Textile Dye Degradation, Sedef İlk, Deni̇z Demi̇rcan, Semran Sağlam, Necdet Sağlam, Zakir M. O. Rzayev

Turkish Journal of Chemistry

Poly(MA-\textit{alt}-MVE)-$g$-PLA/ODA-MMT nanocomposite was prepared by self-catalytic interlamellar graft copolymerization of L-lactic acid (LA) onto poly(maleic anhydride-\textit{alt}-methyl vinyl ether) copolymer in the presence of octadecyl amine-montmorillonite (ODA-MMT) organoclay. FTIR, $^{1}$H ($^{13}$C) NMR, XRD, and SEM-TEM were utilized for characterizing the resultant nanocomposite. Laccase from \textit{Trametes versicolor} was immobilized onto the prepared nanocomposite by adsorption or covalent coupling. Decolorization of Reactive Red 3 from aqueous solution by laccase immobilized on the nanocomposite was studied in different conditions (pH, temperature, dye concentration, and reaction time) to investigate the decolorization activity with repeated use and storage. The results indicated that more than 77{\%} of …

Go to article

Comparative Density Functional Study Of Antioxidative Activity Of The Hydroxybenzoic Acids And Their Anions, Zoran Markovic, Jelena Djorovic, Jasmina M. Dimitric Markovic, Radomir Biocanin, Dragan Amic Jan 2016

Comparative Density Functional Study Of Antioxidative Activity Of The Hydroxybenzoic Acids And Their Anions, Zoran Markovic, Jelena Djorovic, Jasmina M. Dimitric Markovic, Radomir Biocanin, Dragan Amic

Turkish Journal of Chemistry

Hydroxybenzoic acids (HBAs) and their anions play an important role in the food and pharmaceutical industries because of their antioxidant activity. In this study, we examined the mechanisms of the free radical scavenging action of HBAs and their anions using density functional theory (DFT) methods. Reaction enthalpies related to the mechanisms of free radical scavenging by the investigated species were calculated by DFT methods in water, DMSO, pentylethanoate, and benzene. Hydrogen atom transfer (HAT) is a preferred reaction pathway in benzene, while sequential proton loss electron transfer (SPLET) is a predominant reaction pathway in polar solvents, water, and DMSO for …

Go to article

Ecofriendly One-Pot Synthesis And Antiviral Evaluation Of Novel Pyrazolyl Pyrazolines Of Medicinal Interest, Sobhi Gomha, Magda Abdalla, Mohamad Abd El-Aziz, Nany Serag Jan 2016

Ecofriendly One-Pot Synthesis And Antiviral Evaluation Of Novel Pyrazolyl Pyrazolines Of Medicinal Interest, Sobhi Gomha, Magda Abdalla, Mohamad Abd El-Aziz, Nany Serag

Turkish Journal of Chemistry

Ethyl 3-acetyl-1,5-diphenyl-1$H$-pyrazole-4-carboxylate reacts with a variety of arylaldehydes by grinding method in the presence of a catalytic amount of sodium hydroxide at ambient temperature to give the respective chalcones. The latter compounds react also by grinding method with nitrogen nucleophiles such as hydrazine hydrate, phenylhydrazine, and thiosemicarbazide to afford the corresponding pyrazol-3-yl pyrazolines. A series of 6-pyrazolylpyrimidine-2-thione derivatives were prepared by reaction of the above chalcones with thiourea by grinding method in the presence of a catalytic amount of sodium hydroxide at room temperature. In addition, 7-pyrazolylpyridopyrimidine-3-thione was prepared by reaction of chalcone with 6-aminothiouracil. All the newly synthesized compounds …

Go to article

Preparation And Characterization Of Zno/Mmt Nanocomposite For Photocatalytic Ozonation Of A Disperse Dye, Alireza Khataee, Murat Kiranşan, Semra Karaca, Samira Arefi- Oskoui Jan 2016

Preparation And Characterization Of Zno/Mmt Nanocomposite For Photocatalytic Ozonation Of A Disperse Dye, Alireza Khataee, Murat Kiranşan, Semra Karaca, Samira Arefi- Oskoui

Turkish Journal of Chemistry

ZnO was immobilized on the montmorillonite (MMT) to synthesize ZnO/MMT nanocomposite. Physicochemical properties of the as-synthesized nanocomposite were determined using X-ray diffraction, scanning electron microscopy, transmission electron microscope, Fourier transform infrared spectroscopy, N$_{2}$ adsorption/desorption, and point of zero charge pH (pH$_{pzc})$ analysis. The performance of the prepared ZnO/MMT nanocomposite was examined for the photocatalytic ozonation of Disperse Red 54 (DR54) and the highest decolorization efficiency (88.75{\%} after 60 min of reaction time) was the result for the mentioned process compared to adsorption, single ozonation, catalytic ozonation, and photolysis. The influence of various operational parameters including initial dye concentration, catalyst concentration, …

Go to article

Synthesis Of Novel Thiazolylpyrazoline Derivatives And Evaluation Of Their Antimicrobial Activities And Cytotoxicities, Aouatef Tabbi, Zafer Asim Kaplancikli, Dahmane Tebbani, Leyla Yurttaş, Zerri̇n Cantürk, Özlem Atli, Merve Baysal, Gülhan Turan Zitouni Jan 2016

Synthesis Of Novel Thiazolylpyrazoline Derivatives And Evaluation Of Their Antimicrobial Activities And Cytotoxicities, Aouatef Tabbi, Zafer Asim Kaplancikli, Dahmane Tebbani, Leyla Yurttaş, Zerri̇n Cantürk, Özlem Atli, Merve Baysal, Gülhan Turan Zitouni

Turkish Journal of Chemistry

Several novel thiazolylpyrazoline derivatives were synthesized by reacting substituted 3,5-diaryl-1-thiocarba\-moyl-2-pyrazolines with phenacylbromides. The structures of the synthesized compounds were confirmed by IR, $^{1}$H NMR, $^{13}$C NMR, and MS spectral data. Their antimicrobial activities against Staphylococcus aureus(ATCC-25923), Enterococcus faecalis} (ATCC-29212), Enterococcus faecalis (ATCC-51922), Listeria monocytogenes (ATCC-1911), Klebsiella pneumoniae (ATCC-700603), Pseudomonas aeruginosa (ATCC-27853), Escherichia coli (ATCC-35218), Escherichia coli (ATCC-25922), Candida albicans (ATCC-90028), Candida glabrata (ATCC-90030), Candida krusei (ATCC-6258), and Candida parapsilosis (ATCC-22019) were investigated. The compounds were also studied for their cytotoxic effects using a MTT assay. Compound 7c showed the highest antimicrobial activity, possessing the same potential as chloramphenicol against K. …

Go to article

Bismuth(Iii)-Sio$_{2}$ Catalyzed Synthesis Of Polysubstituted Imidazoles With The Participation Of Azaaryl Derivatives Of Aniline In Four-Component Reactions, Zarrin Ghasemi, Ziba Zakeri, Maryam Allahvirdinesbat Jan 2016

Bismuth(Iii)-Sio$_{2}$ Catalyzed Synthesis Of Polysubstituted Imidazoles With The Participation Of Azaaryl Derivatives Of Aniline In Four-Component Reactions, Zarrin Ghasemi, Ziba Zakeri, Maryam Allahvirdinesbat

Turkish Journal of Chemistry

A series of novel polyaromatic derivatives of imidazole were synthesized by Bi(III) nitrate-SiO$_{2}$ catalyzed four-component reactions of benzil, ammonium acetate, aromatic aldehydes, and $N$-heterocyclic derivatives of aniline under solvent-free conditions.

Go to article

Mn-Doped Zns Quantum Dots As A Room-Temperature Phosphorescent Probe For Analysis Of Glutamic Acid In Foodstuffs, Hayri̇ye Eda Şatana Kara, Burak Demi̇rhan, Buket Er Demi̇rhan Jan 2016

Mn-Doped Zns Quantum Dots As A Room-Temperature Phosphorescent Probe For Analysis Of Glutamic Acid In Foodstuffs, Hayri̇ye Eda Şatana Kara, Burak Demi̇rhan, Buket Er Demi̇rhan

Turkish Journal of Chemistry

L-cysteine-capped Mn-doped ZnS quantum dots (QDs) were used for the determination of glutamic acid in foodstuffs. This method is based on measurement of the quenching of the phosphorescence intensity of the QDs after interacting with glutamic acid. A linear response was observed from 50 to 500 ng mL$^{-1}$ glutamic acid with a limit of detection of 6.79 ng mL$^{-1}$. Room temperature phosphorescence (RTP) intensity of the QDs was quenched rapidly upon the addition of the quencher and the reaction reached equilibrium within 2 min. The quenching mechanism of phosphorescence of Mn-doped ZnS QDs by glutamic acid is dynamic and the …

Go to article

Production, Purification, And Characterization Of A Thermo-Alkali Stable And Metal-Tolerant Carboxymethylcellulase From Newly Isolated Bacillus Methylotrophicus Y37, Yonca Duman, Yonca Yüzügüllü Karakuş, Arzu Sertel, Fi̇kri̇ye Polat Jan 2016

Production, Purification, And Characterization Of A Thermo-Alkali Stable And Metal-Tolerant Carboxymethylcellulase From Newly Isolated Bacillus Methylotrophicus Y37, Yonca Duman, Yonca Yüzügüllü Karakuş, Arzu Sertel, Fi̇kri̇ye Polat

Turkish Journal of Chemistry

A carboxymethylcellulose (CMC)-degrading bacterium was isolated from soil, identified as Bacillus methylotrophicus according to the physiological properties and analyses of 16S rRNA and a partial sequence of the gyrase A (gyrA) gene, and named as B. methylotrophicus Y37. The CMCase enzyme was purified to homogeneity by 20.4-fold with 21.73% recovery using single-step hydrophobic interaction chromatography and biochemically characterized. CMCase showed a molecular weight of approximately 50 kDa as determined by SDS-PAGE. The activity profile of the CMCase enzyme exhibited optimum activity at 45 $^{\circ}$C and pH 5.0. The activity was highly stable at alkaline pH levels. More than 90% of …

Go to article

Chromate Surface-Imprinted Silica Gel Sorbent For Speciation Of Cr In Surface Waters, Mariya Mitreva, Ivanka Dakova, Tanya Yordanova, Irina Karadjova Jan 2016

Chromate Surface-Imprinted Silica Gel Sorbent For Speciation Of Cr In Surface Waters, Mariya Mitreva, Ivanka Dakova, Tanya Yordanova, Irina Karadjova

Turkish Journal of Chemistry

This study is focused on the synthesis of chromate anion imprinted sorbent supported on silica gel for nonchromatographic Cr speciation in surface waters. The preparation procedure is based on grafting of 3-methyl-1-trimethoxysilylpropylimidazolium, preliminarily coordinated to CrO$_{4}^{2-}$ as a template ion, onto the surface of silica gel. Sorption and desorption characteristics of surface-imprinted sorbent toward Cr(III) and Cr(VI) were examined by batch solid-phase extraction. An excellent separation of Cr(VI), selectively retained on the sorbent, from Cr(III) remained in the solution, was achieved at pH 2-3 for 20 min. A freshly prepared mixture of ascorbic acid and nitric acid was selected as …

Go to article

First Prev Next Last