31 research outputs found
Intimate partner violence during pregnancy: case report of a forensic psychiatric evaluation
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The Postcranial Skeleton of an Exceptionally Complete Individual of the Plated Dinosaur Stegosaurus stenops (Dinosauria: Thyreophora) from the Upper Jurassic Morrison Formation of Wyoming, U.S.A.
Copyright: © 2015 Maidment et al. This is an open access article distributed under the terms of the Creative Commons Attribution License [4.0], which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The attached file is the published version of the article
Bone tissue response to plasma-nitrided titanium implant surfaces
A current goal of dental implant research is the development of titanium (Ti) surfaces to improve osseointegration. Plasma nitriding treatments generate surfaces that favor osteoblast differentiation, a key event to the process of osteogenesis. Based on this, it is possible to hypothesize that plasma-nitrided Ti implants may positively impact osseointegration. Objective The aim of this study was to evaluate the in vivo bone response to Ti surfaces modified by plasma-nitriding treatments. Material and Methods Surface treatments consisted of 20% N2 and 80% H2, 450°C and 1.5 mbar during 1 h for planar and 3 h for hollow cathode. Untreated surface was used as control. Ten implants of each surface were placed into rabbit tibiae and 6 weeks post-implantation they were harvested for histological and histomorphometric analyses. Results Bone formation was observed in contact with all implants without statistically significant differences among the evaluated surfaces in terms of bone-to-implant contact, bone area between threads, and bone area within the mirror area. Conclusion Our results indicate that plasma nitriding treatments generate Ti implants that induce similar bone response to the untreated ones. Thus, as these treatments improve the physico-chemical properties of Ti without affecting its biocompatibility, they could be combined with modifications that favor bone formation in order to develop new implant surfaces
Identifying and classifying the sources and uses of xenobiotics in urban environments
The sources and uses of xenobiotics in urban environments are very diverse, making structured approaches
to source and use classification a fundamental requirement for effective pollution management. This
chapter provides a general introduction to the topic of substance source and use identification, highlighting
the key differences between different types of sources (e.g. processes vs. commodities; natural vs.
anthropogenic etc.) and different types of uses (e.g. active vs. passive; dispersive vs. non-dispersive,
etc.). Examples of relevant classification systems and their applications are also given, and the diversity
of potential xenobiotic sources and uses is clearly demonstrated through the description of a series of
‘archetypes’ (i.e. model examples). The chapter concludes with an overview of useful source tracking
approaches (e.g. database mining, marketing surveys, forensic approaches etc.)