Digital Commons Network^™

Ferromagnetic Zno Nanocrystals And Al-Induced Defects, Chinmay Phadnis, Darshana Y. Inamdar, Igor Dubenko, Arjun K. Pathak, Naushad Ali, Shailaja Mahamuni

Publications

ZnO nanocrystals (NCs) capped with polyvinyl pyrrolidone reveal room temperature ferromagnetism. Incorporation of Al³⁺-ions induce defects in ZnO NCs leading to quenching of excitonic luminescence of ZnO at the cost of an increase in the intensity of oxygen vacancy related emission. Photoluminescence excitation spectra exhibit an additional hump like feature attributed to Al-doping. Saturation magnetization of Al³⁺-doped ZnO NCs is the same as that of the undoped ZnO NCs. However, a remarkable decrease in the coercivity associated with change in the nature of M (T) curve and electron paramagnetic resonance signal with g = 1.96 is …

Spatial, Ontogenetic, And Sexual Effects On The Diet Of A Teiid Lizard In Arid South America, J Van Leeuwen, Alessandro Catenazzi, M Holmgren

Publications

Most lizard species feed on small arthropods, and although some are omnivorous, only a few species are strict herbivores. We studied the diet of Dicrodon guttulatum, a teiid lizard endemic to the arid coastal deserts and dry forests of northern Peru. Herbivory by this lizard has been identified as a potential limiting factor in the regeneration of plant communities in these dry ecosystems. We collected gastric and fecal samples of adult males, adult females, and juveniles of D. guttulatum in different plant communities. Based on the ontogenetic shift from insectivory to herbivory observed in other herbivorous lizards, we hypothesized …

Developing Hybrid Approaches To Predict Pka Values Of Ionizable Groups, Shawn Witham, Kemper Talley, Lin Wang, Zhe Zhang, Daquan Gao, Wei Yang, Emil Alexov

Publications

Accurate predictions of pKa values of titratable groups require taking into account all relevant processes associated with the ionization/deionization. Frequently, however, the ionization does not involve significant structural changes and the dominating effects are purely electrostatic in origin allowing accurate predictions to be made based on the electrostatic energy difference between ionized and neutral forms alone using a static structure. On another hand, if the change of the charge state is accompanied by a structural reorganization of the target protein, then the relevant conformational changes have to be taken into account in the pKa calculations. Here we report a hybrid …

Progress In The Prediction Of Pka Values In Proteins, Emil Alexov, Ernest L. Mehler, Nathan Baker, Antonio Baptista, Yong Huang, Francesca Milletti, Jens Erik Nielsen, Damien Farrell, Tommy Carstensen, Mats H.M. Olsson, Jana K. Shen, Jim Warwicker, Sarah Williams, J Michael Word

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The pK_a-cooperative aims to provide a forum for experimental and theoretical researchers interested in protein pK_a values and protein electrostatics in general. The first round of the pK_a-cooperative, which challenged computational labs to carry out blind predictions against pK_as experimentally determined in the laboratory of Bertrand Garcia-Moreno, was completed and results discussed at the Telluride meeting (July 6–10, 2009). This article serves as an introduction to the reports submitted by the blind prediction participants that will be published in a special issue of PROTEINS: Structure, Function and Bioinformatics. …

Perceived Ideological Bias In The College Classroom And The Role Of Student Reflective Thinking: A Proposed Model, Darren L. Linville, Joseph P. Mazer

Publications

The role ideology plays in the university classroom is a continual issue of debate. A common public perception has been that academics are a liberal elite, and that they, in the words of conservative activist David Horowitz, “behave as political advocates in the classroom, express opinions in a partisan manner on controversial issues irrelevant to the academic subject, and even grade students in a manner designed to enforce their conformity to professorial prejudices” (2007, p. 188). The Chronicle of Higher Education demonstrated how pervasive this view has become with a 2004 public opinion poll that found 51% of 1,000 individuals …

Lithium In The Upper Centaurus Lupus And Lower Centaurus Crux Subgroups Of Scorpius-Centaurus, Eric J. Bubar, Marc Schaeuble, Jeremy R. King, Eric E. Mamajek, John R. Stauffer

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We utilize spectroscopically derived model atmosphere parameters and the Li i λ6104 subordinate line and the λ6708 doublet to derive lithium abundances for 12 members of the Upper Centaurus Lupus and Lower Centaurus Crux subgroups of the Scorpius–Centaurus OB Association. The results indicate any intrinsic Li scatter in our 0.9–1.4 M stars is limited to ∼0.15 dex, consistent with the lack of dispersion in 1.0 M stars in the 100 Myr Pleiades and 30–50 Myr IC 2391 and 2602 clusters. Both ab initio uncertainty estimates and the derived abundances themselves indicate that the λ6104 line yields abundances with equivalent or …

Using Gis-Based, Hitchcock Algorithm To Optimize Parking Allocations For Special Events, Wayne A. Sarasua, Prashant Malisetty, Mashrur Chowdhury

Publications

Clemson, a small college town in South Carolina, deals with a massive over-saturation of its transportation system during special events, especially during home football games, resulting in total system failure. This research has developed a methodology to optimize parking, using a Geographic Information System (GIS)-based transshipment algorithm, and it has produced great time savings compared with the individual, “manual” efforts of thousands of drivers attempting to find spaces where available. As such, this research constitutes an effective implementation of the Hitchcock Transportation Algorithm for solving a transshipment problem applied to parking lot distribution. Because the Hitchcock Algorithm considers the network …

Compendium Of Library/Informatics Competencies For The Health Sciences Professions, Jonathan D. Eldredge, Sarah K. Morley, Ingrid C. Hendrix, Richard D. Carr, Jason Bengtson

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No abstract provided.

A Taxonomic Revision Of The New World Genus Oropodes Casey (Coleoptera, Staphylinidae, Pselaphinae), Michael S. Caterino, Donald S. Chandler

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The genus Oropodes is characterized and revised with 18 species being treated. Members of this genus are found in temperate forests to desert brush lands from Oregon to Baja California, but are associated primarily with dry forests and shrub lands of California. Keys to males and Females, where known, are provided. Seven species are redescribed: O. arcaps (California), O. dybasi (Oregon), O. ishii (California), O. nuclere (California), O. orbiceps (California), O. rumseyensis (California), O. yollabolly (California). The name Oropodes raffrayi (California) is raised from synonymy and the species is redescribed, stat. n. Ten new species are described: O. aalbui (California), …

Localisation To Lipid Rafts Correlates With Increased Function Of The Gal/Galnac Lectin In The Human Protozoan Parasite, Entamoeba Histolytica, Brenda H. Welter

Publications

Entamoeba histolytica is the causative agent of dysentery and liver abscess and is prevalent in developing countries. Adhesion to the host is critical to infection and is mediated by amoebic surface receptors. One such receptor, the Gal/GalNAc lectin, binds to galactose or N-acetylgalactosamine residues on host components and consists of heavy (Hgl), light (Lgl) and intermediate (Igl) subunits. The mechanism by which the lectin assembles into a functional complex is not known. The parasite also relies on cholesterol-rich domains (lipid rafts) for adhesion. Therefore, it is conceivable that rafts regulate the assembly or function of the lectin. To test …

Posets From Admissible Coxeter Sequences, Matthew Macauley, Henning S. Mortveit

Publications

We study the equivalence relation on the set of acyclic orientations of an undirected graph Γ generated by source-to-sink conversions. These conversions arise in the contexts of admissible sequences in Coxeter theory, quiver representations, and asynchronous graph dynamical systems. To each equivalence class we associate a poset, characterize combinatorial properties of these posets, and in turn, the admissible sequences. This allows us to construct an explicit bijection from the equivalence classes over Γ to those over Γ′ and Γ′′, the graphs obtained from Γ by edge deletion and edge contraction of a fixed cycle-edge, respectively. This bijection yields quick and …

Beverage Consumption And Bmi Of British Schoolchildren Aged 9-13 Years, Tara Coppinger, Y. M. Jeanes, M. Mitchell, S. Reeves

Publications

Objective Adequate fluid intake has been well documented as important for health but whether it has adverse effects on overall energy and sugar intakes remains under debate. Many dietary studies continue to refrain from reporting on beverage consumption, which the present study aimed to address. Design A cross-sectional survey investigated self-reported measures of dietary intake and anthropometric measurements. Setting Primary and secondary schools in south-west London, UK. Subjects Boys and girls (n 248) aged 9-13 years. Results Boys consumed 10 % and girls consumed 9 % of their daily energy intake from beverages and most children had total sugar intakes …

Core Information Literacy Competencies In Hsc Curricula, Jonathan D. Eldredge, Ingrid C. Hendrix, Charity T. Karcher

Publications

Information literacy has become an essential skill set for all health professionals, particularly due to its central role in evidence-based practice. The purpose of this document is to provide HSC programs with the basic information literacy competencies that should be included, integrated, and assessed in all HSC curricula. This document can be adapted to the needs of individual curricula. For example, individual programs can use it to identify at what points in their curriculum these competencies are or should be met or whether these competencies should be met as prerequisites.

Book Review: The Flat World And Education The Importance Of Linda Darling-Hammond’S Latest Book To Reading Recovery Professionals, C. C. Bates, Susan King Fullerton

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No abstract provided.

Teachers’ Perceptions Of Integrating Information And Communication Technologies Into Literacy Instruction: A National Survey In The United States, David Reinking, Amy Hutchison

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In this commentary, we argue that literacy research would be more productive if researchers had a clearer, more nuanced understanding of theory. Specifically, we argue that theory in a practice-oriented field is most fundamentally productive when it provides instrumental guidance for literacy beyond academic understanding about literacy. Premises for that argument are presented, as well as how productivity connects to an instrumental view of theory within the philosophy of science. We provide examples from authoritative sources and relevant studies suggesting that conceptions and uses of theory in literacy research are ambiguous, diffuse, and incoherent. We argue that productivity could be …

Military Bonuses, Education And National Security, 2011 October, Clinton H. Whitehurst Jr.

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No abstract provided.

Structure Of Parasite Component Communities Of Didelphid Marsupials: Insights From A Comparative Study, F Agustín Jiménez, François Catzeflis, Scott L Gardner

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The parasite fauna of the gray four-eyed opossum, Philander opossum (Linnaeus, 1758), and the common opossum, Didelphis marsupialis Linnaeus, 1758, in Camp du Tigre, French Guiana, is characterized. Nine species from the gastrointestinal system were recovered from both species, which shared 80% of their parasites. The parasite fauna comprised several monoxenous species (63%) and was dominated by Aspidodera raillieti Travassos, 1914, which exhibited high levels of prevalence and abundance in both communities. Only 2 species (Moennigia sp. and Spirura guianensis) had been recorded in other species of mammals. Both species richness and taxonomic composition at the level of …

A Modified Surface On Titanium Deposited By A Blasting Process, Caroline O' Sullivan, Peter O'Hare, Greg Byrne, Liam O'Neill, Katie B. Ryan, Abina M. Crean

Publications

Abstract

: Hydroxyapatite (HA) coating of hard tissue implants is widely employed for its biocompatible and osteoconductive properties as well as its improved mechanical properties. Plasma technology is the principal deposition process for coating HA on bioactive metals for this application. However, thermal decomposition of HA can occur during the plasma deposition process, resulting in coating variability in terms of purity, uniformity and crystallinity, which can lead to implant failure caused by aseptic loosening. In this study, CoBlast™, a novel blasting process has been used to successfully modify a titanium (V) substrate with a HA treatment using a dopant/abrasive regime. …

Cluster Observations Of Bow Shock Energetic Ion Transport Through The Magnetosheath Into The Cusp, K. J. Trattner, S. M. Petrinec, S. A. Fuselier, K. Nykyri, E. Kronberg

Publications

The observation of energetic particles by polar orbiting satellites in the magnetospheric cusp resulted in a controversy about their source region. It has been suggested that these cusp energetic particles (CEP) with significant fluxes from magnetosheath energies up to several hundred keV/e are accelerated locally in the cusp by the turbulence found in cusp diamagnetic cavities (CDC). As an alternative to the local acceleration region, the quasi‐parallel shock is successful as a source region for CEP events. Energetic ions accelerated at the bow shock can be transported downstream and enter the cusp along newly reconnected field lines. Composition and energy …

Pushing The Boundaries Of Cultural Congruence Pedagogy In Science Education Towards A Third Space, Cassie Quigley

Publications

This review explores Meyers and Crawford’s “Teaching science as a cultural way of knowing: Merging authentic inquiry, nature of science, and multicultural strategies” by examining how they combine the use of inquiry-based science instruction with multicultural strategies. In this conversation, I point to the need of specific discourse strategies to help teachers and students create hybrid spaces to push the boundaries of cultural congruence as described in this article. These strategies include a reflective component to the explicit instruction that encourages an integration of home and science discourses. My response to this work expands on their use of multicultural strategies …

A Formative Experiment To Enhance Teacher-Child Language Interactions In A Preschool Classroom, Barbara A. Bradley, David Reinking

Publications

A formative experiment investigated how two strategies aimed at increasing the quality and quantity of language interactions could be integrated into a preschool classroom. Strategies for enriching language interactions were introduced during book sharing, semi-structured group activities, and mealtimes. Mixed methods revealed factors that enhanced, inhibited, or sometimes prevented the integration of enriching language interactions during the school day and accordingly what adaptations might be warranted. Specifically, data revealed increases in the quantity and quality of teacher—child interactions during book sharing and mealtimes, but not during semi-structured group activities. Implications are discussed for professional development, classroom practice, and how formative …

Toward GemeinschaftsgefüHl: Exploring Subordinate And Manager Perceptions Of Trust And Perceptions Regarding Behavioral Change Potential, Bobby G. Martin

Publications

In this qualitative, phenomenological study, Maslow‘s Eupsychian theory was used as the guiding framework for exploring the perceptions of trust and the behavioral change potential of subordinates (includes frontline supervisors) and managers (excludes frontline supervisors) within selected aviation maintenance organizations in Arizona. The problem addressed in the study was the growing concern that managers willfully mistreated subordinates, which led to decreased trust, motivation, and productivity. A combined representative sample of 10 maintenance technicians and frontline supervisors was purposively selected from the production lines of a large commercial aviation repair and overhaul station located in Arizona. An additional combined representative sample …

Two-Scale Microstructure Dynamics, Arkadi Berezovski, Mihhail Berezovski, Juri Engelbrecht

Publications

Wave propagation in materials with embedded two different microstructures is considered. Each microstructure is characterized by its own length scale. The dual internal variables approach is adopted yielding in a Mindlin-type model including both microstructures. Equations of motion for microstructures are coupled with the balance of linear momentum for the macromotion, but not coupled with each other. Corresponding dispersion curves are provided and scale separation is pointed out.

Left Ventricular Assist Devices: Engineering Design Considerations, Marwan A. Simaan, Eduardo Divo, George Faragallah, Yu Wang

Publications

Patients with end-stage congestive heart failure awaiting heart transplantation often wait long periods of time (300 days or more on the average) before a suitable donor heart becomes available. The medical community has placed increased emphasis on the use of Left Ventricular Assist Devices or LVADs that can substitute for, or enhance, the function of the natural heart while the patient is waiting for the heart transplant (Poirier, 1997; Frazier & Myers, 1999). Essentially, a rotary LVAD is a pump that operates continuously directing blood from the left ventricle into the aorta by avoiding the aortic valve. Generally speaking, the …

Detailed Abundances Of The Solar Twins 16 Cygni And B Cygni: Constraining Planet Formation Models, Simon C. Schuler, Katia Cunha, Verne V. Smith, Luan Ghezzi, Jeremy R. King, Constantine P. Deliyannis, Ann Merchant Boesgaard

Publications

Results of a detailed abundance analysis of the solar twins 16 Cyg A and 16 Cyg B based on high-resolution, high signal-to-noise ratio echelle spectroscopy are presented. 16 Cyg B is known to host a giant planet while no planets have yet been detected around 16 Cyg A. Stellar parameters are derived directly from our high-quality spectra, and the stars are found to be physically similar, with ΔTeff = +43 K, Δ log g =−0.02 dex, and Δξ = +0.10 km s−1 (in the sense of A − B), consistent with previous findings. Abundances of 15 elements are derived and …

A Missense Mutation In Clic2 Associated With Intellectual Disability Is Predicted By In Silico Modeling To Affect Protein Stability And Dynamics, Shawn Witham, Kyoko Takano, Charles Schwartz, Emil Alexov

Publications

Large-scale next generation resequencing of X chromosome genes identified a missense mutation in the CLIC2 gene on Xq28 in a male with X-linked intellectual disability (XLID) and not found in healthy individuals. At the same time, numerous nsSNPs (nonsynonomous SNP) have been reported in the CLIC2 gene in healthy individuals indicating that the CLIC2 protein can tolerate amino acid substitutions and be fully functional. To test the possibility that p.H101Q is a disease-causing mutation, we performed in silico simulations to calculate the effects of the p.H101Q mutation on CLIC2 stability, dynamics, and ionization states while comparing the effects obtained for …

Stress Response In Confined Arrays Of Frictional And Frictionless Particles, Abdullah Cakir, Leo Silbert

Publications

Stress transmission inside three-dimensional granular packings is investigated using computer simulations. Localized force perturbation techniques are implemented for frictionless and frictional shallow, ordered, granular arrays confined by solid boundaries for a range of system sizes. Stress response profiles for frictional packings agree well with the predictions for the semi-infinite half-plane of classical isotropic elasticity theory down to boxes of linear dimensions of approximately forty particle diameters and over several orders of magnitude in the applied force. The response profiles for frictionless packings exhibit a regime of transition to strongly anisotropic features with increasing box size. The differences between the natures …

Particle‐In‐Cell Simulation Of Incoherent Scatter Radar Spectral Distortions Related To Beam‐Plasma Interactions In The Auroral Ionosphere, M. A. Diaz, M. Oppenheim, J. L. Semeter, M. Zettergren

Publications

An electrostatic parallel particle‐in‐cell (EPPIC) code that allows for particle beam injections and multiple boundary conditions is used to investigate the beam‐plasma interaction and its manifestations in the incoherent scatter (IS) spectrum. Specifically, the code is used to investigate anomalous enhancements in the ion acoustic line through the destabilization of the plasma by injection (or precipitation) of low‐energy electron beams. This enhancement of the ion acoustic line is a form of IS distortion commonly observed in the vicinity of auroral arcs called the naturally enhanced ion‐acoustic line (NEIAL). Simulations confirm the parametric decay of Langmuir waves as a plausible mechanism, …

Improved Keratinase Production For Feather Degradation By Bacillus Licheniformis Zjuel31410 In Submerged Cultivation, Hui Ni, Qi-He Chen, Feng Chen, Ming-Liang Fu, Ya-Chen Dong, Hui-Nong Cai

Publications

Optimal medium was used to improve the production of keratinase by Bacillus licheniformis ZJUEL31410, which has a promising application in the transformation of feather into soluble protein. The results of single factor design revealed that the concentration of feather at 20 g/l and the initial pH at value 8 was the best for the production of keratinase and the degradation of feather. Ammonia salt and nitrate salt strongly restricted the production of keratinase and the degradation of feather. Result of Box-Behnken design (BBD) experiment which was used to optimize concentrations of glucose, corn steep flour and K₂HPO_{4 …}

Development Of A Second-Stage Novice Driver Education And Training Program, John Wagner, M Jensen, F Switzer, K Alexander, P Pidgeon

Publications

Novice drivers are overrepresented in traffic crashes and fatalities. Traffic crashes are the leading cause of death for 16 to 20 year olds and account for one in three deaths in this age group (NHTSA, 2008; CDC, 2010). Significant research has been conducted developing and analyzing driver education and training and education programs. Effective programs identify their target audiences and tailor the program paradigm and methods to their developmental needs. This paper develops a second-stage safe driver program for novice drivers focusing on classroom and behind-the-wheel instruction for four common driving skills and situations: braking, avoiding obstacles, losing control, and …