1,720,963 research outputs found
Developmental trajectories of behavior problems of youth involved in child welfare: influence of caregiver and peer relationships
No full textThis dissertation examined the developmental trajectories of adolescent youth involved with the child welfare system, particularly focusing on their externalizing and internalizing behavioral problems. The study investigated how adolescents’ relationships with caregivers and peers change over time and how they affect these behavioral outcomes. The study also explored whether removing youth from their biological family predicted distinct trajectories of behavior functioning compared to those who remained at home. Data are from the National Survey of Child and Adolescent Well-being (NSCAW), a national probability sample of children and adolescents who have contact with child protective services. Two types of structural equation modeling (SEM), latent growth curve modeling and cross-lagged designs were conducted using M-Plus. All analyses were conducted with sample weights.
Youths reported significantly decreasing internalizing behavior problems over the study period of 36 months. On the other hand, externalizing problems remained considerably stable over time. In order to investigate if youth had different development trajectories depending on whether they stayed at home or were placed in out-of-home care, the sample was divided into four placement groups, i.e., out-of-home youth, in-home youth, the initial out-of-home youth (those who returned home later), and the initial in-home youth (those who were removed from home later). When group differences were investigated, youths did not show significant differences in the initial levels and rates of change of internalizing or externalizing problems over time. In addition, relationships with caregivers and peers were found to be comparable across four groups. Caregiver and peer relationships were significantly related to youths’ internalizing and externalizing problems at baseline as well as over time. When temporal causal relations among caregiver relationships, peer relationships, and behavior problems were investigated, externalizing problems of youth at 18 months were found to affect their caregiver and peer relationships at 36 months.Ph.D.Includes bibliographical references (p. 100-113)by Inseon Le
Crosslinked chitosan coating on magnetic mesoporous silica with pre-adsorbed carbonic anhydrase for carbon dioxide conversion
No full textCarbonic anhydrase (CA), an enzyme converting CO2 to bicarbonate, was adsorbed into magnetically-separable spherical mesocellular siliceous foam (Mag-S-MCF). Then, chitosan was adsorbed onto the surface of Mag-S-MCF with pre-adsorbed enzymes, and further crosslinked via the glutaraldehyde treatment. The resulting composite materials, the crosslinked chitosan coating on Mag-S-MCF with pre-adsorbed CA (ADS-CA/CS-GA), could effectively prevent leaching of enzymes, showing no decrease of enzyme activity under shaking (200 rpm) for 85 days. ADS-CA/CS-GA also showed no activity decrease under recycled uses via facile magnetic separation, and could be successfully used for the biocatalytic CO2 conversion to bicarbonate, which was further utilized to generate calcium carbonate in the second batch reactor. (C) 2015 Elsevier B.V. All rights reserved.
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
Enhanced stability and reusability of marine epoxide hydrolase using ship-in-a-bottle approach with magnetically-separable mesoporous silica
No full textWe developed magnetically-separable and highly-stable biocatalyst system of Mugil cephalus epoxide hydrolase (McEH) for enantioselective hydrolysis of racemic epoxides. McEH protein was adsorbed and cross-linked into mesoporous silica with bottle-neck mesopores, which effectively prevented the leaching of cross-linked McEH in a larger mesocellular pores. This ship-in-a-bottle approach allows for highly loaded and stable McEH system. For example, free McEH showed only 7.5% of initial activity under shaking condition at 80 h while ship-in-a-bottled McEH retained 79.5% of initial activity in the same condition. Stable McEH in magnetically-separable mesoporous silica could achieve the yield of 45% for the preparation of enantiopure (S)-styrene oxide with 98%ee. The magnetic nanoparticles pre-incorporated in mesoporous silica enabled an easy recovery of immobilized McEH for repetitive batch resolutions of racemic styrene oxide, allowing for more than 50% of the initial activity was retained after seven recycled uses. (C) 2012 Elsevier B.V. All rights reserved.
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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
Figure_S2 – Supplemental material for Ectopic transient overexpression of <i>OCT-4</i> facilitates BMP4-induced osteogenic transdifferentiation of human umbilical vein endothelial cells
No full textSupplemental material, Figure_S2 for Ectopic transient overexpression of OCT-4 facilitates BMP4-induced osteogenic transdifferentiation of human umbilical vein endothelial cells by Seung Hyun L Kim, Seunghun S Lee, Inseon Kim, Janet Kwon, Song Kwon, Taegeun Bae, Junho Hur, Hwajin Lee and Nathaniel S Hwang in Journal of Tissue Engineering</p
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
suppl_tables – Supplemental material for Ectopic transient overexpression of <i>OCT-4</i> facilitates BMP4-induced osteogenic transdifferentiation of human umbilical vein endothelial cells
No full textSupplemental material, suppl_tables for Ectopic transient overexpression of OCT-4 facilitates BMP4-induced osteogenic transdifferentiation of human umbilical vein endothelial cells by Seung Hyun L Kim, Seunghun S Lee, Inseon Kim, Janet Kwon, Song Kwon, Taegeun Bae, Junho Hur, Hwajin Lee and Nathaniel S Hwang in Journal of Tissue Engineering</p
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