755 research outputs found

    FIMCAR V: Off-set Test Procedure: Review and metric Development

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    The off-set test is the most common test procedure in vehicle crash testing. These procedures are currently used in the European frontal directive (96/79/EC) and in consumer tests like Euro NCAP, IIHS, etc. In both compulsory and consumer testing cases, the ODB test consists of an impact into a honeycomb barrier (EEVC barrier) with a 40% overlap. The current ODB procedures only assess the self-protection of the tested vehicle. There are no methodologies investigating the partner-protection (e.g. structural interaction or frontal force levels) using these test configurations. Another off-set test procedure – the Progressive Deformable Barrier (PDB), a 50% off-set test – has been investigated for structural interaction and frontal force level assessment. The PDB is considered as the most promising off-set test procedure to assess partner-protection issues. In the PDB test, the deformation of the honeycomb barrier can be measured after the test. The PDB honeycomb is stiffer than the EEVC barrier and becomes progressively stiffer with increased deformation. The barrier 3D deformation profile is used to analyse the structural interaction and force levels of the tested vehicle. The PDB assessment procedure shall use the barrier deformation as an input. The specific objective of the deliverable is to define the fundamental concepts for developing assessment criteria and associated performance limits for the off-set test procedure. In an initial phase, existing test procedures have been investigated and an initial assessment methodology has been developed. This includes the review from past compatibility research projects and review of current test protocols. The robustness of the assessment criteria is investigated and potential for misuse in vehicle design is identified. Full scale tests and simulation studies were performed to investigate topics like robustness, repeatability and reproducibility of the test and the assessment criteria. Existing Euro NCAP tests performed in recent years were used to support this investigation. Based on the results of the tests performed, different proposals for criteria and limits have been investigated. Although the PDB is a promising procedure to evaluate compatibility issues such load spreading, at this stage of the project the criterion was not possible to be fully developed. For this reason the ODB is proposed as off-set test procedure, the ODB procedure will maintain the current self-protection requirements. However, PDB might still be an option for the future when validated compatibility metrics can be proposed. Therefore, the FIMCAR consortium agreed to further develop PDB criteria

    Intake of 12 food groups and disability-adjusted life years from coronary heart disease, stroke, type 2 diabetes, and colorectal cancer in 16 European countries

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    Our aim was to estimate and rank 12 food groups according to disability-adjusted life years (DALYs) from coronary heart disease (CHD), stroke, type 2 diabetes (T2D), and colorectal cancer (CRC) in 16 European countries. De novo published non-linear dose–response meta-analyses of prospective studies (based on 297 primary reports), and food consumption data from the European Food Safety Authority Comprehensive European Food Consumption Database in Exposure Assessment, and DALY estimates from the Institute for Health Metrics and Evaluation were used. By implementing disease-specific counterfactual scenarios of theoretical minimum risk exposure level (TMRELs), the proportion of DALYs attributed to 12 food groups was estimated. In addition, a novel modelling approach was developed to obtain a single (optimized) TMREL across diseases. Four scenarios were analysed (A: disease-specific TMRELs/all food-disease associations; B: disease-specific TMRELs/only significant food-disease associations; C: single TMREL/all food-disease associations; D: single TMREL/only significant food-disease associations). Suboptimal food intake was associated with the following proportions of DALYs; Scenario A (highest-estimate) and D (lowest-estimate): CHD (A: 67%, D: 52%), stroke (A: 49%, D: 30%), T2D (A: 57%, D: 51%), and CRC (A: 54%, D: 40%). Whole grains (10%) had the highest impact on DALYs, followed by nuts (7.1%), processed meat (6.4%), fruit (4.4%) and fish and legumes (4.2%) when combining all scenarios. The contribution to total DALYs of all food groups combined in the different scenarios ranged from 41–52% in Austria to 51–69% in the Czech-Republic. These findings could have important implications for planning future food-based dietary guidelines as a public health nutrition strategy

    Reclaiming languages, decolonizing knowledge(s): Articulating Indigenous knowledge(s) in and for language reclamation

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    Indigenous scholars have long been calling for the integration of Indigenous ways of teaching and learning in education (e.g. Kawagley, 2005; Simpson, 2002), showing that placing Indigenous philosophies at the center of curriculum makes education more relevant to students and helps ameliorate persistent educational inequalities (Brayboy et al., 2015; McCarty & Lee, 2015). Language is an active and living repository of Indigenous philosophies and world views, vital for maintaining Indigenous knowledge systems (McCarty & Lee, 2015). This research project seeks to learn from Indigenous language and culture reclamation efforts and initiatives that aim to center Indigeneity to reclaim what has been or could be lost. Through a review of community-based and community-driven Indigenous education programs in the U.S. and around the world, this research project explores the knowledges and pedagogies that drive these efforts, specifically, how Indigenous knowledge systems are being articulated within language reclamation movements. The knowledge gained through this investigation will help support the youth-led development of Bòg!, an interactive game that centers students’ home languages and knowledge systems through storytelling. The goal is to bring this work to schools and other organizations in Minnesota that work with linguistically diverse youth to reclaim their culture and native languages

    Auswirkungen verschiedener Tränken auf Stewart-Parameter des Säuren-Basen-Haushaltes bei Kälbern mit experimentell induzierter metabolischer Azidose

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    Das Ziel dieser Arbeit war es, den Einfluss unterschiedlich zusammengesetzter Tränken auf den Säuren-Basen-Haushalt bei Kälbern mit experimentell induzierter metabolischer Azidose zu untersuchen. Bei gesunden Kälbern konnte nachgewiesen werden, dass die Fütterung von milchbasierten ORL mit einer [SID3] ≥92 mmol/l eine Erhöhung der Plasma-[SID3] zur Folge hat (BACHMANN et al. 2009b) und damit eine alkalische Wirkung auf den SBS. Zu prüfen galt die Hypothese, ob es bei Kälbern mit experimentell induzierter metabolischer Azidose zu einem stärkeren alkalisierenden Effekt nach Gabe einer Tränke mit einer hohen [SID3] kommt. Bessere alkalisierende Eigenschaften einer Tränke könnten potentiell genutzt werden, um den Genesungsprozess von Kälbern mit metabolischer Azidose zu beschleunigen. Material und Methoden Zur Verfügung standen zwölf Kälber der Rasse Holstein-Friesian im Alter von weniger als vier Lebenswochen. Unter Verwendung von in der Literatur beschriebenen Induktionsprotokollen konnte per Infusion bei jeweils sechs Tieren eine manifeste hyperchlorämische Azidose und bei weiteren sechs Kälbern eine D-/L-Laktatazidose ausgelöst werden. Die Tiere wurden im Anschluss mit Milchaustauscher, wasser- oder milchaustauscher-basierter oraler Rehydratationslösung getränkt bzw. blieben im nüchternen Zustand. Zur Bestimmung von Stewart-Parametern des Säuren-Basen-Haushaltes im Plasma wurden nach einem festgelegten zeitlichen Schema vor und nach Induktion sowie vor und nach der Tränkegabe venöse Blutproben entnommen. Ergebnisse Bedingt durch die Einleitungsprotokolle war die Interpretation der Messergebnisse durch den starken Anstieg des Plasmavolumens bedeutend erschwert. Die eingesetzten Induktionsprotokolle sind nicht für Untersuchungen des Säuren-Basen-Haushaltes bei Kälbern nach unterschiedlicher Fütterung geeignet. Aus diesem Grund kann die aufgestellte Hypothese, dass die Verabreichung von milchaustauscher-basierter ORL zu einer besseren alkalischen Wirkung bei Kälbern mit metabolischer Azidose führt, anhand der vorliegenden Ergebnisse weder abgelehnt noch bestätigt werden. Einige Untersuchungsergebnisse zeigten positive Effekte auf Parameter des SBS bei Kälbern, denen eine Tränke verabreicht wurde, im Vergleich zu nüchternen Tieren. Diese Parameter waren die Plasma-D-Laktatkonzentration, die Strong Ion Difference [SID3] und [SID4] und ionisiertes Calcium [Ca2+]. Die Effekte waren nicht auf eine bestimmte der drei eingesetzten Tränkevarianten zurückzuführen. Weiterhin konnte gezeigt werden, dass ein quadratischer Zusammenhang zwischen der berechneten Variable Strong Ion Gap [SIGAlb/TP] und den gemessenen D-/L-Laktatkonzentrationen im Plasma besteht. Dies könnte zukünftig genutzt werden, um Faktoren zu etablieren, welche die Ableitung der Plasma-D-/L-Laktatkonzentration bei durchfallkranken Kälbern mit ZNS-Symptomatik aus gängigen Parametern ermöglicht, ohne die Laktatkonzentration direkt messen zu müssen. Schlussfolgerungen Für zukünftige Untersuchungen dieser Art wäre ein Induktionsprotokoll wünschenswert, das sowohl eine metabolische Azidose bei gleichzeitiger Dehydratation der Kälber vereint und so die metabolischen Bedingungen durchfallkranker Kälber simuliert. Die Gabe von ORL als direkte Einmischung in Milch bzw. MAT wird kritisch betrachtet. Ein negativer Effekt bei der Gabe von MAT-basierter ORL konnte bei diesen Untersuchungen auf keinen der bestimmten Parameter des SBS im Vergleich zu den anderen Tränkezusammensetzungen festgestellt werden. Klinische Nebenwirkungen Bei dieser Untersuchung traten nach der mehrfachen Infusion von D-/L-Laktat unerwartete Nebenwirkungen auf. Die Verabreichung führte zu starken Irritationen der Vena jugularis externa und zu Ödembildungen. Erhöhte D-Laktatkonzentrationen werden beim Menschen und verschiedenen Tierarten als Marker für traumatische Prozesse, Ischämie, Diabetes, gastrointestinale und neurologische Störungen diskutiert. Die weitere gezielte Untersuchung des Einflusses der wiederholten oder anhaltenden Einwirkung von D-Laktat auf Epithelzellen könnte nach den vorliegenden Untersuchungsergebnissen einen weiteren Anhaltspunkt für die Aufklärung der genauen pathologischen Mechanismen des D-Laktates bieten

    3D models of the hematopoietic stem cell niche under steady-state and active conditions

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    Hematopoietic stem cells (HSCs) in the bone marrow are able to differentiate into all types of blood cells and supply the organism each day with billions of fresh cells. They are applied to cure hematological diseases such as leukemia. The clinical need for HSCs is high and there is a demand for being able to control and multiply HSCs in vitro. The hematopoietic system is highly proliferative and thus sensitive to anti-proliferative drugs such as chemotherapeutics. For many of these drugs suppression of the hematopoietic system is the dose-limiting toxicity. Therefore, biomimetic 3D models of the HSC niche that allow to control HSC behavior in vitro and to test drugs in a human setting are relevant for the clinics and pharmacology. Here, we describe a perfused 3D bone marrow analog that allows mimicking the HSC niche under steady-state and activated conditions that favor either HSC maintenance or differentiation, respectively, and allows for drug testing

    A study of endothelial function and circulating asymmetric dimethylarginine levels in people with Type 1 diabetes without macrovascular disease or microalbuminuria

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    <p>Abstract</p> <p>Background</p> <p>Asymmetric dimethylarginine (ADMA) is a competitive inhibitor of endothelial nitric oxide synthase (eNOS) that is associated with endothelial dysfunction, and is a risk marker for cardiovascular disease, a significant problem in Type 1 diabetes. The aim of the present study was to measure circulating ADMA, and define its association with endothelial dysfunction and endothelial markers in people with Type 1 diabetes with low likelihood of macrovascular disease.</p> <p>Methods</p> <p>Sixty-one young people with Type 1 diabetes without macrovascular disease or nephropathy and 62 healthy volunteers underwent brachial artery flow-mediated dilatation (FMD) and assay of plasma ADMA and adhesion molecules.</p> <p>Results</p> <p>Age, gender, BMI, lipid profile and renal function were similar in the two groups. People with Type 1 diabetes had impaired FMD compared to healthy controls (5.0 ± 0.4 vs 8.9 ± 0.4%; p < 0.001). Plasma ADMA levels were significantly lower in the people with diabetes compared to healthy controls (0.52 ± 0.12 vs 0.66 ± 0.20 μmol/l, p < 0.001). Plasma ICAM-1, E-selectin and PAI-1 levels were significantly higher in people with diabetes compared to healthy controls (median 201 (IQR 172–226) vs 180 (156–216) μg/l, p = 0.027; 44.2 (32.6–60.9) vs. 33.1 (22.4–51.0) μg/l; p = 0.003 and 70.8 (33.3–85.5) vs 46.3 (23.9–76.8) μg/l, p = 0.035). Plasma ADMA and VCAM-1 levels were positively correlated (r = 0.37, p = 0.003) in people with diabetes. There was no correlation between the plasma ADMA and FMD.</p> <p>Conclusion</p> <p>ADMA levels are not associated with endothelial dysfunction in young adults with Type 1 diabetes without microalbuminuria or known macrovascular disease. This suggests that the impaired endothelial function in these individuals is not a result of eNOS inhibition by ADMA.</p
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