43 research outputs found

    Actes de la Conférence nationale et du 13e Colloque de l'AQPC

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    Également disponible en version papierTitre de l'écran-titre (visionné le 26 août 2009

    Les cartes auto-organisatrices de Kohonen appliquées à l'étude des communautés de micro-algues des cours d'eau

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    Les cartes auto-organisatrices de Kohonen appliquées à l'étude des communautés de micro-algues des cours d'ea

    Effect of aneurysm size on procedure-related rupture in patients with subarachnoid hemorrhage treated with coil occlusion

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    Objective: Procedure-related rupture is one of the most feared complications in treating patients with cerebral aneurysm. The primary aim of this study was to estimate the effect of aneurysm size on procedure-related rupture. We also estimated its effect on peri-procedural thromboembolic events. Methods: This observational study was conducted using routinely-collected health data on patients admitted for subarachnoid hemorrhage and treated with aneurysm coil occlusion in the CHU de Québec — Enfant-Jésus hospital from January 1st, 2000 until sample size was reached. Patients were identified from the Discharge Abstract Database using the Canadian Classification of Health codes. Assessment of complications was blind to aneurysm size. Logistic regression models were performed to test associations between aneurysm size and procedure-related rupture or peri-procedural thromboembolic events, and between both procedure-related rupture and thromboembolic events and patients' outcomes. Results: This study included 532 aneurysms treated with coil occlusion in 505 patients. Procedure-related rupture occurred in 34 patients (6.7%) and thromboembolic events in 53 (10.5%) patients. Aneurysms of 2 to 3 mm inclusively were not more significantly associated with procedure-related rupture or thromboembolic events than those larger than 3 mm (OR 1.02, 95% CI: 0.9–1.16, p = 0.78 and OR 1.06, 95% CI: 0.96–1.17, p = 0.3, respectively). However, procedure-related rupture had a significant effect on patient mortality (OR 3.86, 95% CI: 1.42–10.53, p < 0.01). Conclusions: Very small aneurysm size should not preclude aneurysm coil occlusion. Every measure should be taken to prevent procedure-related rupture as it is strongly associated with higher mortality

    Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition)

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    In 2008 we published the first set of guidelines for standardizing research in autophagy. Since then, research on this topic has continued to accelerate, and many new scientists have entered the field. Our knowledge base and relevant new technologies have also been expanding. Accordingly, it is important to update these guidelines for monitoring autophagy in different organisms. Various reviews have described the range of assays that have been used for this purpose. Nevertheless, there continues to be confusion regarding acceptable methods to measure autophagy, especially in multicellular eukaryotes. For example, a key point that needs to be emphasized is that there is a difference between measurements that monitor the numbers or volume of autophagic elements (e.g., autophagosomes or autolysosomes) at any stage of the autophagic process versus those that measure fl ux through the autophagy pathway (i.e., the complete process including the amount and rate of cargo sequestered and degraded). In particular, a block in macroautophagy that results in autophagosome accumulation must be differentiated from stimuli that increase autophagic activity, defi ned as increased autophagy induction coupled with increased delivery to, and degradation within, lysosomes (inmost higher eukaryotes and some protists such as Dictyostelium ) or the vacuole (in plants and fungi). In other words, it is especially important that investigators new to the fi eld understand that the appearance of more autophagosomes does not necessarily equate with more autophagy. In fact, in many cases, autophagosomes accumulate because of a block in trafficking to lysosomes without a concomitant change in autophagosome biogenesis, whereas an increase in autolysosomes may reflect a reduction in degradative activity. It is worth emphasizing here that lysosomal digestion is a stage of autophagy and evaluating its competence is a crucial part of the evaluation of autophagic flux, or complete autophagy. Here, we present a set of guidelines for the selection and interpretation of methods for use by investigators who aim to examine macroautophagy and related processes, as well as for reviewers who need to provide realistic and reasonable critiques of papers that are focused on these processes. These guidelines are not meant to be a formulaic set of rules, because the appropriate assays depend in part on the question being asked and the system being used. In addition, we emphasize that no individual assay is guaranteed to be the most appropriate one in every situation, and we strongly recommend the use of multiple assays to monitor autophagy. Along these lines, because of the potential for pleiotropic effects due to blocking autophagy through genetic manipulation it is imperative to delete or knock down more than one autophagy-related gene. In addition, some individual Atg proteins, or groups of proteins, are involved in other cellular pathways so not all Atg proteins can be used as a specific marker for an autophagic process. In these guidelines, we consider these various methods of assessing autophagy and what information can, or cannot, be obtained from them. Finally, by discussing the merits and limits of particular autophagy assays, we hope to encourage technical innovation in the field

    COMPARAISON DU VOLUME ET DE LA VALEUR DES BOIS RÉSINEUX ISSUS D’ÉCLAIRCIES PAR LE BAS ET PAR DÉGAGEMENT D’ARBRES-ÉLITES DANS L’EST DU CANADA

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    Le choix des tiges à récolter lors des interventions d’éclaircies commerciales peut avoir des répercussions sur la quantité et le type de produits forestiers qu’on peut en tirer, de même que sur la structure des peuplements résiduels. L’objectif de cette étude était de comparer l’éclaircie par le bas (ÉCbas) et deux intensités d’éclaircie par dégagement de 50 (AÉ50) ou 100 (AÉ100) arbres-élites à l’hectare. En 2008, quatre peuplements de 30 ans ont été sélectionnés dans des peuplements résineux naturels et plantations d’épinette blanche au Québec pour comparer les effets des modalités d’éclaircie sur la structure diamétrale, le volume/ha, le diamètre quadratique moyen des arbres marchands (dqm), le volume moyen par tige ainsi que la répartition par type de produits (dimensions) du sciage et co-produits (copeaux et sciures) de première transformation, la valeur de la matière ligneuse récoltée par m3 ha-1. Globalement, il n’y a pas de différences significatives dans les attributs dendrométriques entre les modalités d’éclaircie, sauf la surface terrière et le volume prélevés dans les plantations. La transformation par simulation des bois issus de ces éclaircies permet de produire une proportion analogue de pièces de 1x3, 1x4 et 2x3 pouces, mais ÉCbas produit significativement moins de 2x4 et plus de co-produits par rapport à AÉ50 ou AÉ100.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
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