186,750 research outputs found
The Foundational Role of Open Access in Open Science
No full text<p>Dr. Moumita Koley presented "The Foundational Role of Open Access in Open Science" during the 2023 Annual Forum for Open Research online. </p>
DS_10.1177_0022034518809086 – Supplemental material for A Chemical Approach to Optimizing Bioactive Glass Dental Composites
No full textSupplemental material, DS_10.1177_0022034518809086 for A Chemical Approach to Optimizing Bioactive Glass Dental Composites by S. Aponso, J.G. Ummadi, H. Davis, J. Ferracane and D. Koley in Journal of Dental Research</p
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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Electrochemical advancement of solid state ion selective electrodes
No full textThe general theme of this dissertation is the development of new analytical sensors to quantitatively study biological and environmental samples in aqueous and non-aqueous environments. A platinum ultramicroelectrode (UME) and a unique carbon-based pH microprobe were used to design a new SECM-based electrochemical bioassay. The Pt UME was used to distinguish between different strains of acid-producing Streptococcus mutans oral bacteria based on height and morphological features. The pH microprobe was used to quantitatively measure the pH above the three different S.Mutans biofilms as a biomarker to study dental caries disease. This dissertation focuses on precisely controlling electrochemically deposited ethylenedioxythiophene (EDOT) copolymerized with an alkoxysulfonate derivative of EDOT as a stable and tunable self-doped PEDOT/PEDOT-S copolymer to select for different properties. PEDOT/PEDOT-S copolymer was used as a solid contact material for new monovalent and divalent calibration free ion-selective electrodes. PEDOT/PEDOT-S was also used to fabricate a new solid-state reference electrode with a unique in situ PTFE-AF coating for both aqueous and nonaqueous electroanalytical measurements while satisfying the need for true reference electrode nonaqueous solutions.
A two-probe scanning electrochemical microscopy (SECM)-based bioassay was used to characterize the height, morphology, and pH above three live bacterial biofilms. A 25 μm Pt electrode was used as an SECM probe to quantitatively map the morphology, height, and volume of the biofilm surface. A second probe, a unique carbon-based fast response pH microprobe, was used to quantify the local metabolic activity by quantitively measuring the pH profile above the three different biofilms when fed with sucrose. S. mutans B04Sm5 wild-type (WT) was recently isolated from early childhood dental caries patients and was found to produce a new N-acyl tetramic acid called mutanocyclin. An SECM characterization of the WT immediately after sucrose feeding found that the pH of the acidic environment 50 μm above the biofilm was 4.42 ± 0.54 (N=5). A laboratory strain S. mutans UA 159 had a pH of 5.21 ± 0.22 (N=4), and a variant of S. mutans B04Sm5 (MUTD) produced a local environment pH of 4.51 ± 0.40 (N=7). The change in the pH of the local environment normalized by height for the three strains showed the WT: 0.09 ± 0.02 (ΔpH ⁄ μm) (N=3), MUTD 0.05 ± 0.01 (ΔpH ⁄ μm) (N=7), and UA 159: 0.03 (ΔpH ⁄ μm) (N=2). A comparison of WT with the laboratory strain UA 159 showed that the pH of the local environment for WT was more acidic than UA 159 (p=0.043, 95%). There was no statistical deference between the WT and MUTD strains.
A unique back contact made of 3,4-Ethylenedioxythiophene (EDOT) and 4-(2,3-dihydrothieno [3,4-b][1,4]dioxin-2-yl-methoxy)-1-butanesulfonic acid, sodium salt (EDOT-S) was designed as a back contact for calibration free monovalent and divalent solid state ion selective electrodes (ISEs). The calibration free ISEs showed near Nernstian responses of 57.2 ± 0.2 mV/log [K+] and 28.5 ± 0.3 mV/log [Ca2+] while maintaining their respective selectivity against major interfering ions. The detection limits for Ca2+ and K+ ISEs were 0.45 ± 0.01 mM and 1.68 ± 0.18 mM, respectively. The charging cycles of the PEDOT/PEDOT-S back contact allowed us to fix the background potential at a desired fixed intercept value across different ionophores (K+, Ca2+). This protocol was used to determine the content of K+ and Ca2+ in creek water samples. The concentration of [Ca2+] and [K+] in a local creek was 257 ± 7.3 mM (N=6) and 28.1± 1.1 mM (N=3), respectively.
Currently, there is no reference electrode that is adequate for both aqueous and organic solutions. Silver-silver chloride (Ag/AgCl) is the most widely used reference for aqueous potentiometry and amperometry experiments. This reference is particularly robust due to the half-reaction of Ag/AgCl, but the stability of the potential can change with wire strain and requires a cumbersome liquid salt bridge or complex polymer membranes. The leaching of ions can contaminate the samples, rendering them unsuitable for applications requiring a limited sample volume (e.g., wearable sensors). In nonaqueous solutions, a liquid junction of unknown potential occurs due to an unmissable aqueous salt bridge and a nonaqueous sample. Water and ion leakage into the organic phase plague Ag/AgCl electrodes in nonaqueous solutions. A self-doped PEDOT/PEDOT-S solid state reference electrode with high mechanical and chemical durability and in situ PTFE-AF coating was designed to maintain a fixed potential based on the ratio of oxidized species to reduced species in the polymer as indicated by the Nernst equation. The PEDOT/PEDOT-S reference characterized versus ferrocene in acetonitrile with 0.1 M TBAPF6 had a stable potential of 0.411 V ± 0.008 V versus ferrocene over 14 days (N=3). The single junction PTFE-AF coated PEDOT/PEDOT-S electrode showed a potential of 0.397 V ± 0.009 V characterized versus ferrocene (2100 cycles) (N=3). For nonaqueous applications where size is not limited, we designed a double junction form of the PEDOT/PEDOT-S solid state reference electrode with a potential of 0.384 V versus ferrocene that did not change over four days (3100 cycles)
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
Author Rights and Scholarly Publishing
Get PDFOriginally posted at
http://blog.library.gsu.edu/2014/10/24/author-rights-and-scholarly-publishing/</p
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