177,061 research outputs found
Effect of Ultrasonic Instrumentation in Treatment of Primary Molars
No full textABSTRACTAimThe aim of this study is to describe the protocol used in the treatment of pulpally necrosed primary molars and to evaluate the effectiveness of ultrasonic instrumentation technique in primary dentition.Materials and methodsA total of 50 primary molars in 40 children, ranging from 8 to 10 years of age, were endodontically treated using standard protocols and ultrasonic instrumentation. The follow-up was done for each case ranging from 1 to 2½ years.ResultsClinical and radiographic controls showed a success rate of 97.5%, considering an evaluation time of 19 ± 9.02 months.ConclusionThe use of ultrasonic instrumentation in primary molars with pulpal necrosis succeeded in reducing appointment time and showed a high success rate.Clinical significanceUltrasonic instrumentation should be used as a standard protocol in instrumentation of endodontic treatment of primary molars so as to increase the success rate of primary teeth pulpectomies.How to cite this articleSingh R, Barua P, Kumar M, Safaya R, Monajemi H, Monajemi H. Effect of Ultrasonic Instrumentation in Treatment of Primary Molars. J Contemp Dent Pract 2017;18(9):750-753.</jats:sec
Proton tunnelling in ribosomal peptide bond formation / Hadieh Monajemi
No full textProton transfer reactions are simple yet important reactions which have been immensely
investigated in different studies due to their dominance in many chemical and
biochemical systems. The dual wave-particle nature of protons enables them to tunnel
through classically high potential energy barriers. Being temperature independent,
proton tunnelling can occur at any temperature. Hence, many studies have suggested
that some enzymatic reactions with high energy barriers go through proton tunnelling.
However, the occurrence of tunnelling has not yet been investigated in one of the most
puzzling enzymatic reactions, i.e. the process of peptide bond formation in a large
complex enzyme called the ribosome. A large part of this study aims to investigate the
tunnelling behaviour in this mechanism using computational quantum chemistry tools
and theoretical methods. We proposed three novel proton transfer mechanisms for this
reaction which are based on three different crystallographic structures. Using density
functional theory, we first obtained the structural and physical information about these
reaction mechanisms. The rate of these reactions were then calculated using reaction
rate theories with classical motion approximation. Ultimately, the tunnelling correction
was calculated numerically and added to the classical reaction rate to investigate the
tunnelling behaviour of proton. The results show that in one of our novel proposed
mechanisms, the ribosome induces tunnelling by thinning the energy barrier width
through shortening the proton donor-acceptor distance. This explains the unexpectedly
high rate of ribosomal peptide bond formation. Using this idea, we attempted to induce
tunnelling in a synthetic reaction and increase its efficiency. For this purpose, we
studied the reaction of boronic acid with diols which is important in designing an
efficient non-enzymatic glucose sensor for blood glucose monitoring applications. The results indicate that one way to induce tunnelling through decreasing the donor-acceptor
distance is to increase the electronegativity of the R-group. The transition structure for
the highest electronegative R-group exhibits the shortest proton path from boronic acid
to diol. The direct correlation of the electronegativity and the tunnelling corrected
reaction rate further supports the importance of the lower donor-acceptor distance in
inducing tunnelling
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Liftings for noncomplete probability spaces
No full textThe current state of knowledge concerning liftings for noncomplete probability spaces is discussed. This is a somewhat expanded version of the author's talk given at the 1991 Summer Conference on General Topology and Applications in Honor of Mary Ellen Rudin and Her Work.PT: S; CR: BURKE MR, IN PRESS P AM MATH S BURKE MR, 1991, ISRAEL J MATH, V73, P33 BURKE MR, 1992, ISRAEL J MATH, V79, P289 CARLSON T, THEOREM LIFTING CHRISTENSEN JPR, 1974, TOPOLOGY BOREL STRUC FREMLIN DH, 1989, HDB BOOLEAN ALGEBRAS, P877 INOESCUTULCEA A, 1966, 5TH P BERK S MATH ST, V2 IONESCUTULCEA A, 1967, CONTRIBUTIONS PROB 1, P63 IONESCUTULCEA A, 1969, TOPICS THEORY LIFTIN JECH TJ, 1978, SET THEORY JOHNSON RA, 1980, P AM MATH SOC, V80, P234 JUST W, IN PRESS T AM MATH S KUPKA J, 1983, INDIANA U MATH J, V32, P717 LOSERT V, 1983, LNM, V1080, P95 MAHARAM D, 1958, P AM MATH SOC, V9, P987 SHELAH S, 1983, ISRAEL J MATH, V45, P90 TALAGRAND M, 1982, P AM MATH SOC, V84, P379 VONNEUMANN J, 1931, CRELLES J MATH, V165, P109; NR: 18; TC: 0; J9: ANN N Y ACAD SCI; PG: 4; GA: BZ86BSource type: Electronic(1
Hansen, Lee (Lee R.). Union, non-union, and managerial pay plan state employees, 2008-2019
No full text1 online resource (2 pages)"July 1, 2021."Provides the number of union and non-union state employees in each of the last 14 years. Also provides the number of state employees paid under the state's managerial pay plan during each of those years. Updates OLR research report 2019-R-011
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