Digital Commons Network^™

Stabilizing Nanostructured Solid Oxide Fuel Cell Cathode With Atomic Layer Deposition, Yunhui Gong, Diego Palacio, Xueyan Song, Rajankumar L. Patel, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

We demonstrate that the highly active but unstable nanostructured intermediate-temperature solid oxide fuel cell cathode, La_0.6Sr_0.4CoO_3-δ (LSCo), can retain its high oxygen reduction reaction (ORR) activity with exceptional stability for 4000 h at 700 C by overcoating its surfaces with a conformal layer of nanoscale ZrO₂ films through atomic layer deposition (ALD). The benefits from the presence of the nanoscale ALD-ZrO₂ overcoats are remarkable: a factor of 19 and 18 reduction in polarization area-specific resistance and degradation rate over the pristine sample, respectively. The unique multifunctionality of the ALD-derived nanoscaled ZrO₂ overcoats, …

Mole Street Journal, August 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Mole Street Journal, July 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Strengthening Stem Performance And Persistence : Influence Of Undergraduate Teaching Assistants On Entry-Level Stem Students., Stephanie B. Philipp

Electronic Theses and Dissertations

Increasing retention of students in science, technology, engineering, or mathematics (STEM) programs of study is a priority for many colleges and universities. This study examines an undergraduate teaching assistant (UTA) program implemented in a general chemistry course for STEM majors to provide peer learning assistance to entry-level students. This study measured the content knowledge growth of UTAs compared to traditional graduate teaching assistants (GTAs) over the semester, and described the development of peer learning assistance skills of the UTAs as an outcome of semester-long training and support from both science education and STEM faculty. Impact of the UTA program on …

Development And Evaluation Of A Thermochemistry Concept Inventory For College-Level General Chemistry, David A. Wren

Dissertations

The research presented in this dissertation culminated in a 10-item Thermochemistry Concept Inventory (TCI). The development of the TCI can be divided into two main phases: qualitative studies and quantitative studies. Both phases focused on the primary stakeholders of the TCI, college–level general chemistry instructors and students. Each phase was designed to collect evidence for the validity of the interpretations and uses of TCI testing data. A central use of TCI testing data is to identify student conceptual misunderstandings, which are represented as incorrect options of multiple– choice TCI items. Therefore, quantitative and qualitative studies focused heavily on collecting evidence …

Design, Development, And Psychometric Analysis Of A General, Organic, And Biological Chemistry Topic Inventory Based On The Identified Main Chemistry Topics Relevant To Nursing Clinical Practice, Corina E. Brown

Dissertations

This two-stage study focused on the undergraduate nursing course that covers topics in general, organic, and biological (GOB) chemistry. In the first stage, the central objective was to identify the main concepts of GOB chemistry relevant to the clinical practice of nursing. The collection of data was based on open-ended interviews of both nursing and chemistry teaching faculty as well as practicing nurses. From the resulting interviews, three themes emerged: topics that were Important--had a direct application in nursing clinical practice; topics that were Foundational--not directly important for nursing clinical practice but facilitated the understanding of the important topics; and …

Studies Of Molecular Encapsulation And Preparation Of Novel Cage Molecules, Yanhua Qiu

Open Access Dissertations

This dissertation deals with studies of molecular encapsulation and preparation of novel molecular cages. The author begins in Chapter 1 with a short discussion of molecular encapsulation and some of the molecular hosts such as cavitands, carcerands, hemicarcerands, hexamericresorcinarene capsules and molecular cages and then presents more introductory material on a deep cavity cavitand and cucurbit[7]uril since the author’s research is majorly based on these two molecular hosts. The author is interested in the electrochemistry studies of redox-active guests and their electrochemical kinetic changes before and upon encapsulation in aqueous solution so as to mimick the behavior of redox proteins …

Mole Street Journal, June 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Characterization Of The Gas-Sensing Protein Cooa, Teryn Gehred, Jessica Lyza

Symposium on Research and Creative Expression (SORCE)

This research aims to characterize the binding specificity of heme proteins to various gas signal molecules. Heme proteins in the gas-sensing family bind to specific gas signal molecules, causing a certain biological function to be activated or deactivated. In this study, variants of the carbon monoxide sensing heme protein CooA from the bacteria R.rubrum and C. hydrogenoformans are compared. Key differences in signal binding specificity and heme environment configuration will be investigated. This is done by using site-directed mutagenesis to alter the heme environment, isolating the CooA proteins through protein purification, and analyzing the isolated products through DNA binding assays. …

Erosive Arthritis And Hepatic Granuloma Formation Induced By Peptidoglycan Polysaccharide In Rats Is Aggravated By Prasugrel Treatment., Analia E Garcia, Mario C Rico, Elisabetta Liverani, Raul A Dela Cadena, Paul F. Bray, Satya P Kunapuli

Cardeza Foundation for Hematologic Research

Administration of the thienopyridine P2Y12 receptor antagonist, clopidogrel, increased the erosive arthritis induced by peptidoglycan polysaccharide (PG-PS) in rats or by injection of the arthritogenic K/BxN serum in mice. To determine if the detrimental effects are caused exclusively by clopidogrel, we evaluated prasugrel, a third-generation thienopyridine pro-drug, that contrary to clopidogrel is mostly metabolized into its active metabolite in the intestine. Prasugrel effects were examined on the PG-PS-induced arthritis rat model. Erosive arthritis was induced in Lewis rats followed by treatment with prasugrel for 21 days. Prasugrel treated arthritic animals showed a significant increase in the inflammatory response, compared with …

The Versatility Of Ether-Bridged Cycloadducts Towards The Synthesis Of Complex Natural Products, Harold Deshaun Cooper

Doctoral Dissertations

The presence of a heterocyclic moiety can be observed in many of today’s bioactive natural products. One of the most commonly observed is furan, an aromatic five-membered ring containing an oxygen atom. Furan is a simple compound, yet versatile enough to be used as a synthetic synthon leading to complex structures such as the antioxidant Phelligridin G and the antibacterial agent Platensimycin. In the former, it is spiro-fused to the five-membered carbocycle of the 6-5-5 tricyclic domain while in the latter it makes up the ether-bridged cycloadduct of the hydrophobic cage. Conventionally, furan can undergo cycloadditions in the presence of …

Identification And Differentiation Of Tier 1 Bacterial Agents Using Gas Chromatography-Mass Spectrometry, Dan Li

Theses and Dissertations

A simple method was developed for detection and differentiation of five Tier 1 bacterial agents, including Bacillus anthracis, Francisella tularensis, Yersinia pestis, Burkholderia pseudomallei and Burkholderia mallei as well as their closely related near neighbors by gas chromatography-mass spectrometry (GC-MS). Generally, different classes of compounds can be used as biomarkers for biowarfare agent detection, including nucleic acids (i.e., DNA or RNA), proteins (i.e., antibodies), carbohydrates (i.e., sugars), lipopolysaccharides, lipids (i.e., fatty acids) and small molecules. One-step thermochemolysis (TCM) was developed to provide GC-MS detectable biomarker signatures, including sugars, fatty acids and small molecules. Solid phase micro-extraction (SPME) was used for …

Mole Street Journal, May 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Mole Street Journal, April 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Climate Evolution Of The Antarctic Peninsula Over The Last 1,000 Years : An Environmental Magnetism Analysis Of Two High Resolution Sediment Cores, Brendan Reilly

Theses, Dissertations and Culminating Projects

Two marine sediment cores from very different depositional environments, off the coast of western and northeastern Graham Land, Antarctic Peninsula (AP), record high resolution climatic records of the last 1,000 years. This study finds evidence in the sedimentary magnetic signature for a regional shift from warmer to colder climatic conditions around 1100-1400 AD. The first core, from middle Barilari Bay, western AP, displays a shift from seasonally open marine conditions to sub/proximal ice shelf ca. 1100 AD, with evidence for multiple grounding line advances in the magnetic mineral distributions during the first half of the last millennium. Prior to the …

Where Does The Water Come From? A Temporal Geochemical Characterization Of Water Sources In The Lives Of Storms, Mallory Ringham

Renée Crown University Honors Thesis Projects - All

An analysis of the ion chemistry, δ¹⁸O, and δ²H values of precipitation may allow for the characterization of their water sources. As water evaporates, it retains a signature of its source in the ions that it carries and in the amount of fractionation of the oxygen and hydrogen isotopes. Precipitation samples for coastal, lake effect, and continental sources were collected over the months of October- January in Syracuse, New York throughout the duration of each storm, including one hurricane, one thunderstorm, two lake effect snowstorms, and seven rain events. These samples were run through IC, ICP-OES, …

The Production Of Organic Nitrates In Portland Oregon And The Columbia River Gorge, Holly Ann Neill

Dissertations and Theses

This work studied the production of aerosol-phase organic nitrates in both Portland and the Columbia River Gorge (CRG). Ozone and NO_x species were investigated for correlation with organic nitrate aerosol, as they function as precursors to the production of organic nitrates. These ambient gas-phase measurements were collected in the same locations as high-volume (Hi-Vol) filters samples, in an urban and rural gorge setting to investigate correlations at the origin of the pollution plume and downwind. A novel Soxhlet extraction method for Hi-Vol filters was developed based on literature and EPA standard methods. Analysis for nitrate production was done by …

Mole Street Journal, March 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Honors Research Symposium Program [Spring 2013], University Honors Program Students And Staff

Honors College: News & Publications (2008-2020)

No abstract provided.

Pengembangan Multimedia Pembelajaran Interaktif Topik Gaya Antarmolekul Pada Mata Kuliah Ikatan Kimia, Muhammad Muchson

Jurnal Pendidikan Sains

Salah satu topik dalam mata kuliah ikatan kimia di perguruan tinggi adalah gaya antarmolekul (intermolecular forces). Gaya antarmolekul akan lebih mudah dipahami oleh pebelajar jika divisualisasikan menggunakan representasi mikroskopik dinamis. Representasi tersebut dapat dikemas dalam bentuk multimedia interaktif berbasis komputer. Tujuan penelitian ini adalah untuk mengembangkan multimedia pembelajaran interaktif berbasis komputer pada topik gaya antarmolekul dalam mata kuliah ikatan kimia. Pengembangan multimedia mengadopsi model 4D yang dikembangkan oleh Thiagarajan, Semmel, dan Semmel, yang terdiri atas empat tahap, yaitu (1) front-end analysis dan task analysis, (2) desain multimedia, (3) pengembangan multimedia, serta (4) distribusi multimedia. Multimedia hasil pengembangan terdiri atas petunjuk …

Mole Street Journal, February 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Mole Street Journal, January 2013, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

Mole Street Journal, December 2012, University Of Arkansas, Fayetteville. Dept. Of Chemistry And Biochemistry

Mole Street Journal

No abstract provided.

An Honors Interdisciplinary Community-Based Research Course, David Dunbar, Melissa Terlecki, Nancy Watterson, Lisa Ratmansky

Honors in Practice Online Archive

BACKGROUND

Community-Based Research (CBR) is an important extension and development of existing community service learning (Stoecker). CBR has as its emphasis research questions asked or needed by the community and, therefore, positions students working alongside community members with the purpose of solving a community issue or creating social change. In doing so, it also allows student development of research skills and methods. A hallmark of CBR is collaboration between a community and academicians through all steps in the course design process, including the crafting of the initial research planning stages, implementation of the research, and dissemination of results and knowledge …

An Honors Interdisciplinary Community-Based Research Course, David Dunbar, Melissa Terlecki, Nancy Watterson, Lisa Ratmansky

Honors in Practice Online Archive

Community-Based Research (CBR) is an important extension and development of existing community service learning (Stoecker). CBR has as its emphasis research questions asked or needed by the community and, therefore, positions students working alongside community members with the purpose of solving a community issue or creating social change. In doing so, it also allows student development of research skills and methods. A hallmark of CBR is collaboration between a community and academicians through all steps in the course design process, including the crafting of the initial research planning stages, implementation of the research, and dissemination of results and knowledge (Israel …

Honors @ Georgia Southern, University Honors Program Students And Staff, Georgia Southern University

Honors College: News & Publications (2008-2020)

• Undergraduate Research
• Honors in Action
• Honors Annual Report
• Alumni Updates
• 30 Years of Honors
• Invest in Honors

Antidepressant Medications And Cognitive Functioning In Major Depressive Disorder, Rachel Kay

Wayne State University Theses

Individuals with Major Depressive Disorder (MDD) frequently experience cognitive decrements in addition to mood impairments. Ironically, antidepressant medications used to treat depression may have adverse effects on cognitive functioning. It is imperative to understand the relative cognitive costs of antidepressants when considering the treatment of MDD patients. Furthermore, observational studies of depression are challenged by problems of systematically confounded variables. Researchers are often faced with difficulties in managing this issue and opt to either ignore the problem, alter their sample, or use inappropriate statistical methods (e.g., Analysis of Covariance) due to a limited understanding of acceptable solutions. It is important …

Little Sewickley Creek: The Redesignation Process Of A High Quality Stream To An Exceptional Value Stream, Nathan Todd Reinhart

Electronic Theses and Dissertations

The Pennsylvania Department of Environmental Protection has set designated uses for all of the 83,000 miles of waterways based on their quality. Only the highest quality streams are afforded the highest protection with a High Quality (HQ) or Exceptional Value (EV). Little Sewickley Creek is designated as a High Quality-Trout Stocking Fishery and may warrant redesignation as an Exceptional Value waterway. The aim of the study was to provide technical data on the stream to support an EV reclassification. The report has compiled previous data and collected new data in order to file a formal petition to the PA DEP. …

The Power Of Affective Factors (Self-Efficacy, Motivation And Gender) To Predict Chemistry Achievement With The Benefits Of Knowledge Surveys On Metacognition Level, Xin Wu

LSU Doctoral Dissertations

Self-efficacy, gender, and motivation are subjective predictors of students' academic achievement. Self-assessment prompted by knowledge surveys involves metacognition, i.e., students' awareness of how they learn. Knowledge surveys can be used to measure changes in students' achievement level and to assist students in content review and inspire reflection on one's ability to learn. In this work, I combined the above predictors into the survey to determine whether achievement in general chemistry can be foreseen. My proposed research will be conducted on 426 students enrolled in General Chemistry I classes (Chemistry for science majors) during a regular 15-week semester at Louisiana State …

Effect Of Blood Collection Practices On Emergency Department Blood Specimen Rejection Rates, Barbara K. Vernoski

UNF Graduate Theses and Dissertations

The practice of obtaining blood as part of the placement of a new peripheral venous access device (p-VAD) is a frequent practice in the emergency department (ED). Of the concerns related to this practice is the possibility of laboratory specimen rejection due to p-VAD catheter size, use of the wrong collection device, and the absence of a standardized collection process. The objective of this study, therefore, was to examine the effect of the use of evidence-based venipuncture and p-VAD blood collection protocols on the rejection rate of blood specimens drawn by staff in the adult areas of an urban academic …