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Articles 1 - 30 of 80
Full-Text Articles in Physical Sciences and Mathematics
Copper And Barium As Dietary Discriminants: The Effects Of Diagenesis, J B. Lambert, S V. Simpson, Carole B. Szpunar, J E. Buikstra
Copper And Barium As Dietary Discriminants: The Effects Of Diagenesis, J B. Lambert, S V. Simpson, Carole B. Szpunar, J E. Buikstra
Carole Szpunar
No abstract provided.
Improving Information Literacy Through Wikipedia Editing In The Chemistry Classroom: Lessons Learned, Ye Li, Charity Flener Lovitt, Anne J. Mcneil, Kristen S. Shuyler
Improving Information Literacy Through Wikipedia Editing In The Chemistry Classroom: Lessons Learned, Ye Li, Charity Flener Lovitt, Anne J. Mcneil, Kristen S. Shuyler
Kristen S. Shuyler
Assignments in which students edit Wikipedia may help students learn about the complexities of information creation and production, while engaging them in researching and writing about topics related to class content. This chapter presents two case studies that illustrate how Wikipedia-based activities can be designed to achieve both chemistry and information literacy learning outcomes. In both examples, faculty partnered with a librarian to implement the Wikipedia editing assignments. Through these experiences, those involved learned about Wikipedia and its community, and identified promising practices for project requirements based on formal and informal assessment and observations. Reflections are offered on the value …
Teaching Climate Change Concepts And The Nature Of Science: A Library Activity To Identify Sources Of Climate Change Misconceptions, Charity Flener Lovitt, Kristen S. Shuyler
Teaching Climate Change Concepts And The Nature Of Science: A Library Activity To Identify Sources Of Climate Change Misconceptions, Charity Flener Lovitt, Kristen S. Shuyler
Kristen S. Shuyler
A library activity was developed in which students found information about climate science misconceptions from popular and scientific literatures. As part of the activity, students developed a rubric to evaluate the credibility and type of literature sources they found. The activity prepared students to produce an annotated bibliography of articles, which they then used to create a training document about a climate science misconception for staff at a local science center. Evaluation of annotated bibliographies showed that students were able to distinguish between popular and scholarly literature but struggled to identify primary and secondary sources within the scholarly literature. In …
Supplemental Materials For Building Data And Information Literacy In The Undergraduate Chemistry Curriculum, Yasmeen Shorish, Barbara A. Reisner
Supplemental Materials For Building Data And Information Literacy In The Undergraduate Chemistry Curriculum, Yasmeen Shorish, Barbara A. Reisner
Yasmeen Shorish
Course syllabus from Chem 481, Fall 2015, to supplement the chapter "Building Data and Information Literacy in the Undergraduate Chemistry Curriculum" in the monograph Integrating Library and Information Literacy Into Chemistry Curricula - ACS Symposium Series, ACS Publications.
A Novel Dual Allosteric Activation Mechanism Of Escherichia Coli Adp-Glucose Pyrophosphorylase: The Role Of Pyruvate, Matías D. Asención Diez, Mabel C. Aleanzi, Alberto A. Iglesias, Miguel Ballicora
A Novel Dual Allosteric Activation Mechanism Of Escherichia Coli Adp-Glucose Pyrophosphorylase: The Role Of Pyruvate, Matías D. Asención Diez, Mabel C. Aleanzi, Alberto A. Iglesias, Miguel Ballicora
Miguel A Ballicora
Fructose-1,6-bisphosphate activates ADP-glucose pyrophosphorylase and the synthesis of glycogen in Escherichia coli. Here, we show that although pyruvate is a weak activator by itself, it synergically enhances the fructose-1,6-bisphosphate activation. They increase the enzyme affinity for each other, and the combination increases Vmax, substrate apparent affinity, and decreases AMP inhibition. Our results indicate that there are two distinct interacting allosteric sites for activation. Hence, pyruvate modulates E. coli glycogen metabolism by orchestrating a functional network of allosteric regulators. We postulate that this novel dual activator mechanism increases the evolvability of ADP-glucose pyrophosphorylase and its related metabolic control.
Interference-Free Gas-Phase Thermometry At Elevated Pressure Using Hybrid Femtosecond/Picosecond Rotational Coherent Anti- Stokes Raman Scattering, Joseph D. Miller, Chloe Elizabeth Dedic, Sukesh Roy, James R. Gord, Terrence R. Meyer
Interference-Free Gas-Phase Thermometry At Elevated Pressure Using Hybrid Femtosecond/Picosecond Rotational Coherent Anti- Stokes Raman Scattering, Joseph D. Miller, Chloe Elizabeth Dedic, Sukesh Roy, James R. Gord, Terrence R. Meyer
Terrence R Meyer
Rotational-level-dependent dephasing rates and nonresonant background can lead to significant uncertainties in coherent anti-Stokes Raman scattering (CARS) thermometry under high-pressure, lowtemperature conditions if the gas composition is unknown. Hybrid femtosecond/picosecond rotational CARS is employed to minimize or eliminate the influence of collisions and nonresonant background for accurate, frequency-domain thermometry at elevated pressure. The ability to ignore these interferences and achieve thermometric errors of <5% is demonstrated for N2 and O2 at pressures up to 15 atm. Beyond 15 atm, the effects of collisions cannot be ignored but can be minimized using a short probe delay (~6.5 ps) after Raman excitation, …
Dna Complexes: Durable Binders, Adam Urbach
Dna Complexes: Durable Binders, Adam Urbach
Adam R Urbach
The ability to program molecules to bind to specific sequences of DNA with high fidelity and stability is an important goal of chemical biology. Such molecules can compete with transcription-factor proteins and thus modulate the transcription of genes. They are therefore promising for both elucidating the complex regulation of mammalian gene expression, and developing pharmaceuticals and medical diagnostics targeted to genetic abberations. Writing in Nature Chemistry, Brent Iverson and co-workers have now described the excellent sequence specificity and unusual binding kinetics of a stable DNA–ligand complex, which exhibits a half-life of 16 days.
A Cucurbit[8]Uril Sponge, Vijayakumar Ramalingam, Sharon Kwee, Lisa Ryno, Adam Urbach
A Cucurbit[8]Uril Sponge, Vijayakumar Ramalingam, Sharon Kwee, Lisa Ryno, Adam Urbach
Adam R Urbach
This paper describes a convenient approach to quantitative removal of the synthetic host cucurbit[8]uril (Q8) from aqueous mixtures using a sepharose resin coated in memantine groups to selectively sequester Q8 in the presence of competing hosts and guests. The “Q8 sponge” can separate Q8 from Q6 and reverse the Q8-mediated dimerization of peptides.
Cucurbit[8]Uril Rotaxanes, Vijayakumar Ramalingam, Adam Urbach
Cucurbit[8]Uril Rotaxanes, Vijayakumar Ramalingam, Adam Urbach
Adam R Urbach
The synthesis of [2]rotaxanes, each comprising a viologen core threaded through a cucurbit[8]uril (Q8, Figure 1) macrocycle and stoppered by tetraphenylmethane groups, and their binding to second guests as inclusion complexes in organic and aqueous media are described. Stoppering was observed to have little effect on binding. Chemical modification of the threaded guest was used to control solubility and binding characteristics, thus demonstrating a novel approach to making artificial receptors with readily modifiable properties.
Come For The Content, Stay For The Community, Hilary Eppley
Come For The Content, Stay For The Community, Hilary Eppley
Hilary J. Eppley
No abstract provided.
Combinatorial Computational Chemistry Approach To The Design Of Metal Oxide Electronics Materials, B. Rodion, Salai Ammal, Y. Inaba, Y. Oumi, S. Takami, M. Kubo, A. Miyamoto, M. Kawasaki, M. Yoshimoto, H. Koinuma
Combinatorial Computational Chemistry Approach To The Design Of Metal Oxide Electronics Materials, B. Rodion, Salai Ammal, Y. Inaba, Y. Oumi, S. Takami, M. Kubo, A. Miyamoto, M. Kawasaki, M. Yoshimoto, H. Koinuma
Salai C. Ammal
Combinatorial chemistry has been developed as an experimental method where it is possible to synthesize hundreds of samples all at once and examine their properties. Recently, we introduced the concept of combinatorial approach to computational chemistry for material design and proposed a new method called `a combinatorial computational chemistry'. In this approach, the effects of large number of dopants, substrates, and buffer layers on the structures, electronic states, and properties of metal oxide electronics material is estimated systematically using computer simulations techniques, in order to predict the best dopant, substrate, and buffer layer for each metal oxide electronics materials.
A Comparison Of Student Perceptions To Actual Performance In Chemistry, Ross Hudson
A Comparison Of Student Perceptions To Actual Performance In Chemistry, Ross Hudson
Dr Ross Hudson
This research was part of a larger study into student performance in senior chemistry with regard to question type and content. This paper examines student perceptions about question type and context and compares these perceptions to actual performance. How students perceive different types of questions and how it influences their self-belief and motivation were the focus of this study. Student responses to different styles or types of questions have been well researched over time. In this study Year 11 chemistry students were quizzed about their preferences to Multiple-Choice questions and Open Response question types and how the presence of each …
Binding-Induced, Turn-On Fluorescence Of The Egfr/Erbb Kinase Inhibitor, Lapatinib, James N. Wilson
Binding-Induced, Turn-On Fluorescence Of The Egfr/Erbb Kinase Inhibitor, Lapatinib, James N. Wilson
James N Wilson
We report the photophysical properties, binding-induced turn-on emission, and fluorescence imaging of the cellular uptake and distribution of lapatinib, an EGFR/ERBB inhibitor. Lapatinib, a type II, i.e. inactive state, inhibitor that targets the ATP binding pocket of the EGFR family of receptor tyrosine kinases. DFT calculations predict that the 6-furanylquinazoline core of lapatinib should exhibit an excited state with charge transfer character and an S0 to S1 transition energy of 3.4 eV. Absorption confirms an optical tran- sition in the near UV to violet, while fluorescence spectroscopy shows that photoemission is highly sensi- tive to solvent polarity. The hydrophobicity of …
Science Classics, Mark Masthay
Science Classics, Mark Masthay
Mark Masthay
An essay on the impact of the works in the Imprints and Impressions: Milestones in Human Progress, an exhibition of rare books from the collection of Stuart Rose. Exhibition was held Sept. 29-Nov. 9, 2014, at the University of Dayton.
Chemistry Of Hydrogen Oxide Radicals (Hox) In The Arctic Troposphere In Spring, J Mao, D J. Jacob, M J. Evans, J R. Olson, X Ren, W H. Brune, T M. St. Clair, J D. Crounse, K M. Spencer, M R. Beaver, P O. Wennberg, M J. Cubison, J L. Jimenez, A Fried, P Weibring, J G. Walega, S R. Hall, A J. Weinheimer, R C. Cohen, G Chen, J H. Crawford, C Mcnaughton, A D. Clarke, L Jaegle, Jenny A. Fisher, R M. Yantosca, P Le Sager, C C. Carouge
Chemistry Of Hydrogen Oxide Radicals (Hox) In The Arctic Troposphere In Spring, J Mao, D J. Jacob, M J. Evans, J R. Olson, X Ren, W H. Brune, T M. St. Clair, J D. Crounse, K M. Spencer, M R. Beaver, P O. Wennberg, M J. Cubison, J L. Jimenez, A Fried, P Weibring, J G. Walega, S R. Hall, A J. Weinheimer, R C. Cohen, G Chen, J H. Crawford, C Mcnaughton, A D. Clarke, L Jaegle, Jenny A. Fisher, R M. Yantosca, P Le Sager, C C. Carouge
Jenny A Fisher
We use observations from the April 2008 NASA ARCTAS aircraft campaign to the North American Arctic, interpreted with a global 3-D chemical transport model (GEOS-Chem), to better understand the sources and cycling of hydrogen oxide radicals (HOx≡H+OH+peroxy radicals) and their reservoirs (HOy≡HOx+peroxides) in the springtime Arctic atmosphere. We find that a standard gas-phase chemical mechanism overestimates the observed HO2 and H2O2 concentrations. Computation of HOx and HOy gas-phase chemical budgets on the basis of the aircraft observations also indicates a large missing sink for both. We hypothesize that this could reflect HO2 uptake by aerosols, favored by low temperatures and …
The Potlib Library Of Potential Energy Functions And A New Global Analytic Pes For The H + O2 Reaction, Ronald Duchovic
The Potlib Library Of Potential Energy Functions And A New Global Analytic Pes For The H + O2 Reaction, Ronald Duchovic
Ronald J. Duchovic
No abstract provided.
A Quasiclassical Trajectory Study Of The Reaction H + O2 Oh + O With The O2 Reagent Vibrationally Excited, Ronald Duchovic, Marla Parker
A Quasiclassical Trajectory Study Of The Reaction H + O2 Oh + O With The O2 Reagent Vibrationally Excited, Ronald Duchovic, Marla Parker
Ronald J. Duchovic
No abstract provided.
[Erratum] A Correction To The Potlib Library Described In "Potlib 2001: A Potential Energy Surface Library For Chemical Systems": [Computer Physics Communications 144 (2002) 169-187], Ronald Duchovic
Ronald J. Duchovic
No abstract provided.
The Potlib As A Means Of Disseminating Pess, Ronald Duchovic
The Potlib As A Means Of Disseminating Pess, Ronald Duchovic
Ronald J. Duchovic
No abstract provided.
Building An Online Teaching Community: An Evolving Tale Ofcommunication, Collaboration, Andchemistry, Barbara Reisner, Hilary Eppley, Margret Geselbracht, Elizabeth Jamieson, Adam Johnson, Sheila Smith, Joanne Stewart, Lori Watson, Scott Williams
Building An Online Teaching Community: An Evolving Tale Ofcommunication, Collaboration, Andchemistry, Barbara Reisner, Hilary Eppley, Margret Geselbracht, Elizabeth Jamieson, Adam Johnson, Sheila Smith, Joanne Stewart, Lori Watson, Scott Williams
Hilary J. Eppley
The Interactive Online Network of Inorganic Chemists (IONiC) has grown from a small group of faculty to a national and international network focused on improving inorganicChemistry learning. IONiC’s vision is to create a community of teachers and learners who make teaching visible using social networking tools to share, discuss, test, and assess their teaching methods. The features that have allowed the IONiC community to develop and grow and IONiC’s vision for the future are described. It is likely that the lessons learned apply to other groups seeking to develop professional communities through social networking.
Ionic: A Cyber-Enabled Community Of Practice For Improving Inorganic Chemicaleducation, Hilary Eppley, Adam Johnson, Ethan Benatan, Margret Geselbracht, Joanne Stewart, Barbara Reisner, Lori Watson, B. Williams
Ionic: A Cyber-Enabled Community Of Practice For Improving Inorganic Chemicaleducation, Hilary Eppley, Adam Johnson, Ethan Benatan, Margret Geselbracht, Joanne Stewart, Barbara Reisner, Lori Watson, B. Williams
Hilary J. Eppley
IONiC’s purpose is to enhance the inorganicChemistry classroom and laboratory experience for students and faculty members through the development of a vibrant virtual “community of practice”.
Jce Viper: An Inorganic Teaching And Learning Community, Ethan Benatan, Jezmynne Dene, Hilary Eppley, Margret Gesebracht, Elizabeth Jamieson, Adam Johnson, Barbara Reisner, Joanne Stewart, Lori Watson, B. Williams
Jce Viper: An Inorganic Teaching And Learning Community, Ethan Benatan, Jezmynne Dene, Hilary Eppley, Margret Gesebracht, Elizabeth Jamieson, Adam Johnson, Barbara Reisner, Joanne Stewart, Lori Watson, B. Williams
Hilary J. Eppley
To facilitate the effective sharing of teaching tools among faculty and the development of deep subject knowledge in support of teaching, a group of faculty from predominantly undergraduate institutions has established a virtual community of inorganic chemists, IONiC (Interactive Online Network of Inorganic Chemists). Our mission is to enhance the inorganicChemistry classroom and laboratory experience for students and faculty members through the development of a vibrant, collaborative, and open community. VIPEr, the Virtual Inorganic Pedagogical Electronic Resource, is a Web site that forms the online home for our community. VIPEr is an interactive Web resource that combines a repository of …
Polymorphism In Myristoylpalmitoylphosphatidylcholine., Stephanie Tristram-Nagle, Yisrael Isaacson, Yulia Lyatskaya, Yufeng Liu, Kay Brummond, John Katsaras, John Nagle
Polymorphism In Myristoylpalmitoylphosphatidylcholine., Stephanie Tristram-Nagle, Yisrael Isaacson, Yulia Lyatskaya, Yufeng Liu, Kay Brummond, John Katsaras, John Nagle
Prof. Stephanie Tristram-Nagle Ph.D.
This study focuses on the mixed-chain lipid myristoylpalmitoylphosphatidylcholine (MPPC) near full hydration. The lipid, synthesized according to the procedure of (Mason et al., 1981a, has a low degree of acyl chain migration. When MPPC is temperature-jumped (T-jumped) from the L alpha phase (T = 38 degrees C) to T = 20 degrees C or below, a subgel phase forms; this formation takes less than 1 h at a temperature below T = 12 degrees C. The subgel remains stable up to T = 29 degrees C. When MPPC is T-jumped from the L alpha phase to T = 24 degrees …
Collaborative Chemical Information Literacy: Is It "Scholarly?", Barbara C. Harvey
Collaborative Chemical Information Literacy: Is It "Scholarly?", Barbara C. Harvey
Barbara C. Harvey
This symposium illustrates a collaborative classroom activity that incorporates information literacy into an introductory chemistry course. The primary learning outcomes of the activity are to understand the peer-review process, knowing how to locate original research articles based on “clues” in a general news article, and how to differentiate between popular and scholarly periodicals. Students work in small groups in a highly-collaborative classroom setting. Each group is given a recent chemistry-related news item, and must determine how and where to find the original research article the news item is based on. Emphasis is placed on identifying original, peer-reviewed research publications. Each …
Joule, John A. Heterocyclic Chemistry (Book Review), Jeffrey H. Glans
Joule, John A. Heterocyclic Chemistry (Book Review), Jeffrey H. Glans
Jeffrey H. Glans
Book review by Jeffrey H. Glans. Joule, John A. and Keith Mills. "A Heterocyclic Chemistry. 5th ed. Wiley-Blackwell, 2010. ISBN 9781405193658 (hardcover); 9781405133005 (pbk.)
P For Discussion: Naming Superheavy Halogen And Noble Elements, Shawn Burdette, Brett Thornton
P For Discussion: Naming Superheavy Halogen And Noble Elements, Shawn Burdette, Brett Thornton
Shawn C. Burdette
No abstract provided.
Tuning Supported Catalyst Reactivity With Dendrimer-Templated Pt-Cu Nanoparticles, Natalie N. Hoover, Bethany J. Auten, Bert D. Chandler
Tuning Supported Catalyst Reactivity With Dendrimer-Templated Pt-Cu Nanoparticles, Natalie N. Hoover, Bethany J. Auten, Bert D. Chandler
Bert D Chandler
The effects of particle composition on heterogeneous catalysis were studied using dendrimer-encapsulated nanoparticles (DENs) as precursors to supported Pt-Cu catalysts. Bimetallic Pt-Cu DENs with varying Pt/Cu ratios were prepared in an anaerobic aqueous solution and deposited onto a high-purity commercial alumina support. The dendrimer template was then thermally removed to yield supported nanoparticle catalysts, which were studied with toluene hydrogenation and CO oxidation catalysis as well as infrared spectroscopy of adsorbed CO. Incorporating Cu into Pt nanoparticles had opposite effects on the two test reactions. Cu acted as a mild promoter for CO oxidation catalysis, and the promoting effect was …
Biophyschem2011: A Joint Meeting Of The Australian Society For Biophysics And The Raci Physical Chemistry Division Foreword, Adam Trevitt, Jeffrey Reimers, Ronald Clarke, Jamie Vandenberg
Biophyschem2011: A Joint Meeting Of The Australian Society For Biophysics And The Raci Physical Chemistry Division Foreword, Adam Trevitt, Jeffrey Reimers, Ronald Clarke, Jamie Vandenberg
Adam Trevitt
[extract] This Research Front of the Australian Journal of Chemistry is aligned with the BIOPHYSCHEM2011 meeting, a joint conference of the Australian Society for Biophysics and the Physical Chemistry Division of the RACI, which was held at the University of Wollongong from 3 to 6 December 2011. Just shy of 200 delegates made the journey to the Illawarra as these two societies came together for the first time for a national meeting. The idea for this collaboration sprang from the inaugural Australian Biophysical Chemistry Workshop, coordinated by Dr Ron Clarke (U. Sydney) and Dr Tak Kee (U. Adelaide) in 2010. …
Soil Chemistry: Understanding Phosphorus In The Environment, Paul Milham, Warwick Dougherty, Robert Morrison, Robert Clark, Ronald Smernik, Ashlea Doolette, Lucy Burkitt, Damian Collins, Rebeca Alvarez, Andrew Thomas
Soil Chemistry: Understanding Phosphorus In The Environment, Paul Milham, Warwick Dougherty, Robert Morrison, Robert Clark, Ronald Smernik, Ashlea Doolette, Lucy Burkitt, Damian Collins, Rebeca Alvarez, Andrew Thomas
Robert Clark
It is an essential ingredient in food production, but poor management means bad news downstream. Understanding the way phosphorus behaves in the environment calls for soil and plant biology, and some new soil chemistry.
Two-Stage Mechanism For Activation Of The Dna Replication Checkpoint Kinase Cds1 In Fission Yeast, Xu Yong, Matthew Davenport, Thomas Kelly
Two-Stage Mechanism For Activation Of The Dna Replication Checkpoint Kinase Cds1 In Fission Yeast, Xu Yong, Matthew Davenport, Thomas Kelly
Matthew P Davenport
The DNA replication checkpoint is a complex signal transduction pathway, present in all eukaryotic cells, that functions to maintain genomic integrity and cell viability when DNA replication is perturbed. In Schizosaccharomyces pombe the major effector of the replication checkpoint is the protein kinase Cds1. Activation of Cds1 is known to require the upstream kinase Rad3 and the mediator Mrc1, but the biochemical mechanism of activation is not well understood. We report that the replication checkpoint is activated in two stages. In the first stage, Mrc1 recruits Cds1 to stalled replication forks by interactions between the FHA domain of Cds1 and …