57,377 research outputs found
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
Gastroesophageal reflux disease and tooth erosion
No full textThe increasing prevalence of gastroesophageal reflux disease (GERD) in children and adults, and of “silent refluxers” in particular, increases the responsibility of dentists to be alert to this potentially severe condition when observing unexplained instances of tooth erosion. Although gastroesophageal reflux is a normal physiologic occurrence, excessive gastric and duodenal regurgitation combined with a decrease in normal protective mechanisms, including an adequate production of saliva, may result in many esophageal and extraesophageal adverse conditions. Sleep-related GERD is particularly insidious as the supine position enhances the proximal migration of gastric contents, and normal saliva production is much reduced. Gastric acid will displace saliva easily from tooth surfaces, and proteolytic pepsin will remove protective dental pellicle. Though increasing evidence of associations between GERD and tooth erosion has been shown in both animal and human studies, relatively few clinical studies have been carried out under controlled trial conditions. Suspicion of an endogenous source of acid being associated with observed tooth erosion requires medical referral and management of the patient as the primary method for its prevention and control.Sarbin Ranjitkar, John A. Kaidonis, and Roger J. Smale
N-butyldeoxynojirimycin treatment restores the innate fear response and improves learning in mucopolysaccharidosis IIIA mice
No full textAvailable online 13 April 2016Abstract not availableXenia Kaidonis, Sharon Byers, Enzo Ranieri, Peter Sharp, Janice Fletcher, Ainslie Derrick-Robert
Platelet rich plasma and dentine effect on sheep dental pulp cells regeneration/revitalization ability (in vitro)
No full textBackground: Platelet rich plasma (PRP) has been proposed as a scaffold for pulp regeneration/revitalization instead of a blood clot. The aim of the following in vitro study was to evaluate the effect of PRP scaffold on proliferation, migration and differentiation of cultured ovine (sheep) dental pulp cells (ODPC) in the presence of dentine. Methods: PRP was prepared by centrifuging blood at 140 g for 12 min. ODPC were cultured on PRP or platelet poor plasma (PPP) scaffolds with and without dentine discs. Cell proliferation, migration and differentiation rates were assessed. Results: ODPC cultured on PRP scaffold showed significantly greater proliferation rates, migration and mineralization compared with cells on PPP or without a scaffold. Dentine discs reduced the proliferation and mineralization potential of the cells. Conclusions: A PRP scaffold has a positive effect on the proliferation, migration and differentiation of ODPC; however, dentine discs have an adverse effect on the activity of ODPC.M Altaii, X Kaidonis, S Koblar, P Cathro, L Richard
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Characterization of p75 neurotrophin receptor expression in human dental pulp stem cells
No full textAbstract not availableWenru Pan, Karlea L. Kremer, Xenia Kaidonis, Victoria E. Ludlow, Mary-Louise Rogers, Jianling Xie, Christopher G. Proud, Simon A. Kobla
A qualitative assessment of non-carious cervial lesions in human teeth
No full textThe definitive version is available at www.blackwell-synergy.com Copyright © 2008 Australian Dental AssociationOpinions vary about the causes of non-carious cervical lesions (NCCLs). They have been attributed to excessive tooth brushing (abrasion), effects of exogenous or endogenous acids (corrosion), and flexion of teeth from occlusal loads (abfraction). Objective: Our aims were to examine the micro-wear detail of NCCLs in a collection of extracted teeth under scanning election microscopy (SEM) and to look for evidence of abrasion and corrosion in these lesions. Methods: Twenty-four extracted teeth with NCCLs were selected from a collection in the Adelaide Dental School. Negative replicas of NCCLs were obtained in polyvinyl impression material (Light Body Imprint ™II Garant™, 3M ESPE) and viewed under SEM. Results: All NCCLs were located below the cemento-enamel junction (CEJ) and they displayed a variety of wedge-shaped appearances. Abrasion was characterized by the presence of horizontal scratch marks, presumably caused by toothbrush and/or dentrifice, while corrosion was characterized by a smooth amorphous surface which at times displayed open dentinal tubules. There was evidence of abrasion in 19 (79.2%) teeth and corrosion in 23 (95.8%) teeth. Eighteen (75.0%) of the 24 teeth displayed evidence of both abrasion and corrosion, whereas 6 (25%) teeth displayed evidence of either abrasion or corrosion. Horizontal furrows were noted in 13 (54.2%) teeth. These furrows had smooth edges, with a corrosive appearance, but no evidence of abrasive scratches. They ranged in width from 5-250 µm. All NCCLs with furrowing displayed evidence of corrosion. Conclusion: Based on microscopic assessment of a sample of extracted teeth, it appears that abrasion and corrosion are common associated aetiological factors in the formation of wedge-shaped NCCLs. This project was supported by the Dental Board of South Australia.C Nguyen, S Ranjitkar, JA Kaidonis, GC Townsen
Relations between x-ray timing features and spectral parameters of galactic black hole x-ray binaries
No full textWe present a study of correlations between spectral and timing parameters for a sample of black hole X-ray binary candidates. Data are taken from GX
339-4, H 1743-322, and XTE J1650-500, as the Rossi X-ray Timing Explorer
(RXTE) observed complete outbursts of these sources. In our study we investigate outbursts that happened before the end of 2009 to make use of the high-energy coverage of the HEXTE detector and select observations that
show a certain type of quasi-periodic oscillations (type-C QPOs). The spectral parameters are derived using the empirical convolution model simpl to model the Comptonized component of the emission together with a disc blackbody for the emission of the accretion disc. Additional spectral features, namely a reflection component, a high-energy cut-off, and excess emission at 6.4 keV, are taken into account. Our investigations confirm the known positive
correlation between photon index and centroid frequency of the QPOs and reveal an anti-correlation between the fraction of up-scattered photons and the QPO frequency. We show that both correlations behave as expected in the “sombrero”
geometry. Furthermore, we find that during outburst decay the correlation between photon index and QPO frequency follow a general track, independent of individual outbursts
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Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging
No full textThis thesis reports an investigation into dual-energy X-ray discrimination techniques. These techniques are designed to provide colour-coded materials discrimination information in a sequence of perspective images exhibiting sequential parallax. The methods developed are combined with a novel 3D imaging technique employing depth from motion or kinetic depth effect (KDE). This technique when applied to X-ray images is termed KDEX imaging and was developed previously by the university team for luggage screening applications at security checkpoints. A primary motivation for this research is that the dual-energy X-ray techniques, which are routinely incorporated into ‘standard’ 2D luggage scanners, provide relatively crude materials discrimination information. In this work it was critical that robust materials discrimination and colour encoding process was implemented as the sequential parallax exhibited by the KDEX imagery may introduce colour changes, due to the different X-ray beam paths associated with each perspective image. Any introduction of ‘colour noise’ into the resultant image sequences could affect the perception of depth and hinder the ongoing assessment of the potential utility of the dual-energy KDEX technique. Two dual-energy discrimination methods have been developed, termed K-II and W-E respectively. Employing the total amount of attenuation measured at each energy level and the weight fraction of layered structures, a combination of the K-II and the W-E techniques enables the computation and extraction of a target objects’ effective atomic number (Zeff) and its surface density (ρS) in the presence of masking layers
Student Project: Replication of Author, Author, & Author (201X, JDM, Study X) - Template
No full textThis project is an independent replication of Author, Author, & Author (201X, study X) conducted as part of the Hagen Cumulative Science Project
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