39 research outputs found
Synthesis of SrTiO3 and Al-doped SrTiO3via the deep eutectic solvent route
No full textSrTiO3 and aluminum-doped SrTiO3 are synthesized by calcination of metal salts dissolved in a deep eutectic solvent (DES) without any post-synthesis treatment. The DES used is the eutectic mixture of choline chloride (hydrogen bond acceptor) and malonic acid (hydrogen bond donor). Titanium(IV) oxide bis(2,4-pentanedionate) is utilized as the non-volatile, easy-to-handle, DES-soluble titanium precursor. The ammonia gas evolved during the calcination process provides a reducing atmosphere, resulting in the formation of Ti3+ and oxygen vacancies within the SrTiO3 matrix. According to UV-Vis spectroscopy and X-ray photoelectron spectroscopy, the amount of Ti3+ species and oxygen vacancies (VO) in the synthesized perovskite can be tuned by varying the duration of the calcination process and by adding Al3+ dopants. Solid state 27Al NMR spectroscopy and powder X-ray diffraction confirm the doping of aluminum into the octahedral site of the perovskite structure. Surface photovoltage spectroscopy confirms that Al3+ dopants can eliminate Ti3+ defects in Al-doped SrTiO3. Ultraviolet illumination experiments in water and aqueous methanol show that SrTiO3 and aluminum-doped SrTiO3, after modification with RhxCr2−xO3 or Pt co-catalysts, evolve small amounts of H2 (EQE of 0.0113–0.0173% at 375 nm) with only traces of O2 detected. The lack of photocatalytic activity is attributed to rapid electron-hole recombination in the oxygen vacancy-rich materials and to the lack of crystal facets that could aid charge separation.This article is published as Adeyemi, Adedoyin N., Amrit Venkatesh, Chengcan Xiao, Zeqiong Zhao, Ying Li, Tori Cox, Dapeng Jing, Aaron J. Rossini, Frank Osterloh, and Julia V. Zaikina. "Synthesis of SrTiO 3 and Al-doped SrTiO 3 via deep eutectic solvent route." Materials Advances (2022).
DOI: 10.1039/D2MA00404F.
Copyright 2022 The Author(s).
Attribution-NonCommercial 4.0 International (CC BY-NC 4.0).
Posted with permission.
DOE Contract Number(s): AC02-07CH11358; SC0015329
Effects of single or combined induction of diabetes mellitus and knee osteoarthritis on some biochemical and haematological parameters in rats
No full textEffects of single or combined administration of salmon calcitonin and omega-3 fatty acids vs. diclofenac sodium in sodium monoiodoacetate-induced knee osteoarthritis in male Wistar rats
No full textAbstractBackground:There is a continuous search for a better therapy in osteoarthritis (OA) management. Therefore, this study investigated the effects of salmon calcitonin (Sct) and/or omega-3 fatty acids (N-3) relative to diclofenac sodium (DF) in induced knee osteoarthritic male Wistar rats.Methods:The 40 rats that were used in this study were divided into 8 groups (n=5 rats), viz: Normal control; OA control; OA+N-3; OA+Low dose of Sct (Sct.Lw); OA+High dose of Sct (Sct.Hi); OA+N-3+SCt.Lw; OA+N-3+Sct.Hi; and, OA+DF. OA was induced with 4 mg of sodium monoiodoacetate in 40 μL of saline. The solution was injected into the left knee joint space of anaesthetised rats. Sct was administered at 2.5 and 5.0 IU/kg b.w. (Results:Sct and/or N-3 significantly reduced c-telopeptide of type 1 collagen (CTX-1), collagen type 2 α-1 (C2M), malondialdehyde (MDA), uric acid (UA), and interleukin-6 (IL-6), but, significantly increased superoxide dismutase (SOD) after OA induction. Both therapies had additive effects on C2M, MDA, SOD, and catalase (CAT), but, non-additive actions on UA, IL-6, and CTX-1. Like the Sct and N-3, DF significantly reduced CTX-1, C2M, UA, and IL-6. However, it had no significant effect on SOD and MDA, even though it significantly reduced CAT activity. None of the therapies had significant effect on total alkaline phosphatase activity, except N-3+Sct.Lw.Conclusions:The combined, and sometimes the single administration of Sct and N-3 proved to be better therapies in OA management than DF.</jats:sec
On the estimation of the black-capped vireo (Vireo atricapillus) territory density using geographic information systems technology, 1996
No full textThis study is based on a 1994 survey of the nesting and territory preferences of the black-capped vireo, a small migratory songbird, within Fort Hood, Texas. By Federal Government Order 51 FR 44808-44812 of 1987 (Tazik et al., 1992), these birds were declared an endangered species based on a series of studies by J. D. Cornelius in 1985 and 1986 (Tazik et al., 1993). In this study, it has been shown that the vireo nesting and territory preferences are not uniform across Fort Hood installation grounds, rather the preference is towards the north to northwest. The vegetation in this region consists of oak woodlands, with grassy undergrowth; the elevation is at most 260 meters above sea level; and the geology yields loose and chalky limestone. In addition, the territory intensity, ?ij(s), for each point s(x,y) in the ijth grid cell on the military installation, has been estimated. For each such grid cell, the probability of a successful territory is given by Geographic Information Systems (GIS) raster color maps of territory distribution of the vireo have been produced. These maps were overlaid on the slope, aspect, soils, elevation, vegetation, and military activities coverages. With the density estimate of nesting success and the GIS maps, territory position preferences were identified, thus, helping in the Land Management Plan for the preservation of the black-capped vireo on the Fort Hood Military Installation
Elevated reproductive toxicity effects of diclofenac after withdrawal: Investigation of the therapeutic role of melatonin
No full texte-Human Resource Management and Organizational Performance (e-HRM) in the Nigerian Banking Industry: An Empirical Study of Guaranty Trust Bank Plc.
No full textTitle of Article : e-Human Resource Management and Organizational Performance (e-HRM) in the Nigerian Banking Industry: An Empirical Study of Guaranty Trust Bank Plc. Author(s): Abiodun, A. J., Adeyemi, K. S.&Osibanjo, A. O. Outlet : ANVESHA The Journal of Management, Indian Education Society’ Management College and Research Centre, Mumbai. Submission Date: 2013 Abstract: The study attempted to examine the effects of e-Human Resource Management (with emphasis on e-recruitment, e-performance management; e-appraisal and e-training) on Organizational Performance focusing on service delivery and commitment. A structured questionnaire was used to collect data from 232 respondents from Guaranty Trust Bank Plc and were analyzed using Amos 21, which can be used in testing relationship between variables. However, it was revealed in our model that strong positive association exist amongst e-HRM variables and was in line with organizational performance variable. Further, noted amongst others is the close and significant relationship that exist between e-recruitment and service delivery, thereby accepting the study hypotheses. It is therefore recommended that banks and by extension the corporate world should adopt the use of electronic in delivering their activities especially in human resources. For further study, similar study should be carried out in other industry like manufacturing
Exploring trends and tropes in young adult fantasy literature from the U.S. since 2005
No full textThis thesis contends that YA fantasy fiction continuously evolves to adapt to its ageing readership, calls for more diversity, and a circuitous relationship between publishers, authors, and content creators which enables fans to participate in the formation of a YA canon distinct from traditional fantasy literature. The first chapter examines the creation of the YA community, exploring how it mimics the behaviours and practices of other fandoms, including gatekeeping membership through cultural capital. This chapter serves as a foundation for the chapters that follow, which each consider close-reading analysis of case study texts alongside paratextual and fan-created sources. Chapter 2 looks at the role of the female protagonist in three YA series: Leigh Bardugo’s Shadow and Bone (2012), Marie Lu’s The Young Elites (2014), and Susan Dennard’s Truthwitch (2016), acknowledging how the novels challenge pseudo-medieval models of fantasy literature through myth-making centering female protagonists. Chapter 3 explores the romanticisation of toxic masculinity in Sarah J. Maas’ popular A Court of Thorns and Roses (2015) trilogy, contending that it normalises hegemonic masculinity by comparing the protagonist’s two love interests and by drawing on fairy tales and Greek mythology. In Chapter 4, I consider how Tomi Adeyemi discusses race and the Black Lives Matter movement in America through her Nigeria-inspired novel Children of Blood and Bone (2018), arguing that she uses allegory in her narrative alongside paratextual and epitextual sources such as interviews and author’s notes in an attempt to educate readers on police brutality in the U.S. Finally, in Chapter 5, I consider how in the Shades of Magic trilogy (2015) V.E. Schwab attempts to create a fantasy setting where queer characters are able to live without fear of discrimination, and how her experiences as an LGBTQ+ author complicate this goal, creating a tension between authorial intention and reader responses
Exploring trends and tropes in young adult fantasy literature from the U.S. since 2005
No full textThis thesis contends that YA fantasy fiction continuously evolves to adapt to its ageing readership, calls for more diversity, and a circuitous relationship between publishers, authors, and content creators which enables fans to participate in the formation of a YA canon distinct from traditional fantasy literature. The first chapter examines the creation of the YA community, exploring how it mimics the behaviours and practices of other fandoms, including gatekeeping membership through cultural capital. This chapter serves as a foundation for the chapters that follow, which each consider close-reading analysis of case study texts alongside paratextual and fan-created sources. Chapter 2 looks at the role of the female protagonist in three YA series: Leigh Bardugo’s Shadow and Bone (2012), Marie Lu’s The Young Elites (2014), and Susan Dennard’s Truthwitch (2016), acknowledging how the novels challenge pseudo-medieval models of fantasy literature through myth-making centering female protagonists. Chapter 3 explores the romanticisation of toxic masculinity in Sarah J. Maas’ popular A Court of Thorns and Roses (2015) trilogy, contending that it normalises hegemonic masculinity by comparing the protagonist’s two love interests and by drawing on fairy tales and Greek mythology. In Chapter 4, I consider how Tomi Adeyemi discusses race and the Black Lives Matter movement in America through her Nigeria-inspired novel Children of Blood and Bone (2018), arguing that she uses allegory in her narrative alongside paratextual and epitextual sources such as interviews and author’s notes in an attempt to educate readers on police brutality in the U.S. Finally, in Chapter 5, I consider how in the Shades of Magic trilogy (2015) V.E. Schwab attempts to create a fantasy setting where queer characters are able to live without fear of discrimination, and how her experiences as an LGBTQ+ author complicate this goal, creating a tension between authorial intention and reader responses
ORIGINAL ARTICLE Spatio-temporal Distribution to Phytoplankton in the Industrial Area of Calabar River, Nigeria 1
No full textABSTRACT Phytoplankton is an important microscopic organism that sustains majority of aquatic life forms with its primary productivity. Literature on the abundance and distributional pattern of phytoplankton in the Calabar River is not readily available. A study was carried out to examine the spatio-temporal distribution, species abundance and diversity of phytoplankton in the Calabar River. Phytoplankton samples were collected by trawling plankton net behind an engine boat across six (6) sampling stations. Result obtained showed that a total of 35 phytoplankton species and 35 taxa representing 6 families were recorded. Chlorophyceae (green algae) and Bacillariophyceae (diatom) were the most abundant phytoplankton families constituting 57.2% of total phytoplankton taxa density, the least encountered families were Cyanophyceae (blue-green algae), Chrysophyceae and Xanthophyceae with 8.6% respectively. The result showed seasonal variation in phytoplankton species, as its abundance increased in the dry season than in the wet season primarily due to the increase in photic depth as well as the reduction in input turbid materials from other tributaries of the Calabar River. The study therefore reveals pollution of the Calabar River characterized by the abundance of phytoplankton taxa
