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151. Consensus canadien sur la contraception (1 re partie de 4)

Author

Black, Amanda, primary, Guilbert, Edith, additional, Costescu, Dustin, additional, Dunn, Sheila, additional, Fisher, William, additional, Kives, Sari, additional, Mirosh, Melissa, additional, Norman, Wendy V., additional, Pymar, Helen, additional, Reid, Robert, additional, Roy, Geneviève, additional, Varto, Hannah, additional, Waddington, Ashley, additional, Wagner, Marie-Soleil, additional, Whelan, Anne Marie, additional, Ferguson, Carrie, additional, Fortin, Claude, additional, Kielly, Maria, additional, Mansouri, Shireen, additional, and Todd, Nicole, additional

Published
2015
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158. Endometrial Ablation in the Management of Abnormal Uterine Bleeding

Author

Laberge, Philippe, primary, Leyland, Nicholas, additional, Murji, Ally, additional, Fortin, Claude, additional, Martyn, Paul, additional, Vilos, George, additional, Wolfman, Wendy, additional, Allaire, Catherine, additional, Awadalla, Alaa, additional, Dunn, Sheila, additional, Heywood, Mark, additional, Lemyre, Madeleine, additional, Marcoux, Violaine, additional, Potestio, Frank, additional, Rittenberg, David, additional, Singh, Sukhbir, additional, and Yeung, Grace, additional

Published
2015
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159. Ablation de l’endomètre dans la prise en charge des saignements utérins anormaux

Author

Laberge, Philippe, primary, Leyland, Nicholas, additional, Murji, Ally, additional, Fortin, Claude, additional, Martyn, Paul, additional, Vilos, George, additional, Wolfman, Wendy, additional, Allaire, Catherine, additional, Awadalla, Alaa, additional, Dunn, Sheila, additional, Heywood, Mark, additional, Lemyre, Madeleine, additional, Marcoux, Violaine, additional, Potestio, Frank, additional, Rittenberg, David, additional, Singh, Sukhbir, additional, and Yeung, Grace, additional

Published
2015
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160. qPCR detection versus microscopy observations for assessing presence-absence of Didymosphenia geminata in Quebec rivers (Canada).

Author

Tiam, Sandra Kim, Laderriere, Vincent, Gillis, Carole-Anne, Fortin, Claude, and Lavoie, Isabelle

Subjects
POLYMERASE chain reaction, NUCLEIC acid isolation methods, DIATOMS
Abstract

Microscopic versus qPCR (quantitative polymerase chain reaction) analyses were compared for the detection of Didymosphenia geminata in biofilms and water filtrates from seven Gaspésie rivers (Canada). For the qPCR approach, two DNA extraction kits (QIAamp DNA Micro Kit, Qiagen and PowerSoil DNA Isolation Kit, Mo Bio Laboratories) and two pairs of primers were considered. The pair of primers D602F/D753Rext did not amplify D. geminata DNA whereas the pair of primers D602F/ D753R was specific for D. geminata. Presence-absence diagnosis based on qPCR and microscopic analyses were consistent: D. geminata was detected in six of the seven rivers, both in the biofilm and filtrate samples. However, technical replications were needed at certain sites to observe the presence of D. geminata cells by microscopy. This underscores the necessity of replicate analyses, which is cost-effective to achieve when using qPCR due to the capacity to process tens of samples in a single PCR run in the context of a large scale assessment. [ABSTRACT FROM AUTHOR]

Published
2017
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161. Cerebral Mycobacterium avium abscesses: Late immune reconstitution syndrome in an HIV-1-infected patient receiving highly active antiretroviral therapy

Author

Fortin, Claude

Subjects
Article Subject
Abstract

A patient who developed an atypical manifestation of Mycobacterium avium complex (MAC) infection almost two years after starting effective highly active antiretroviral therapy is described. The recurrence, manifested as brain abscesses in the central nervous system, was an uncommon form of MAC disease usually reported postmortem. An increased CD4 cell count, localized and suppurative infection, and the absence of systemic evidence of infection were consistent with a late immune reconstitution syndrome. The present case report adds to the understanding of MAC disease in HIV-infected patients.

Published
2005
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162. Antiviraux

Author

Papenburg, Jesse, primary, Therrien, Rachel, additional, Fortin, Claude, additional, and Quach, Caroline, additional

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171. Fanconi Syndrome Accompanied by Renal Function Decline with Tenofovir Disoproxil Fumarate: A Prospective, Case-Control Study of Predictors and Resolution in HIV-Infected Patients

Author

Gupta, Samir K., primary, Anderson, Albert M., additional, Ebrahimi, Ramin, additional, Fralich, Todd, additional, Graham, Hiba, additional, Scharen-Guivel, Valeska, additional, Flaherty, John F., additional, Fortin, Claude, additional, Kalayjian, Robert C., additional, Rachlis, Anita, additional, and Wyatt, Christina M., additional

Published
2014
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173. Achnanthidium minutissimum (Bacillariophyta) valve deformities as indicators of metal enrichment in diverse widely-distributed freshwater habitats

Author

Cantonati, Marco, primary, Angeli, Nicola, additional, Virtanen, Laura, additional, Wojtal, Agata Z., additional, Gabrieli, Jacopo, additional, Falasco, Elisa, additional, Lavoie, Isabelle, additional, Morin, Soizic, additional, Marchetto, Aldo, additional, Fortin, Claude, additional, and Smirnova, Svetlana, additional

Published
2014
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179. Trace metal speciation predictions in natural aquatic systems: incorporation of dissolved organic matter (DOM) spectroscopic quality

Author

Mueller, Kristin K., Lofts, Stephen, Fortin, Claude, Campbell, Peter G.C., Mueller, Kristin K., Lofts, Stephen, Fortin, Claude, and Campbell, Peter G.C.

Abstract

To calculate metal speciation in natural waters, modellers must choose the proportion of dissolved organic matter (DOM) that is actively involved in metal complexation, defined here as the percentage of active fulvic acid (FA); to be able to estimate this proportion spectroscopically would be very useful. In the present study, we determine the free Cd2+, Cu2+, Ni2+ and Zn2+ concentrations in eight Canadian Shield lakes and compare these measured concentrations to those predicted by the Windermere Humic Aqueous Model (WHAM VI). For seven of the eight lakes, the measured proportions of Cd2+ and Zn2+ fall within the range of values predicted by WHAM; the measured proportion of Cu2+ falls within this range for only half of the lakes sampled, whereas for Ni,WHAM systematically overestimated the proportion of Ni2+. With the aim of ascribing the differences between measured and modelled metal speciation to variations in DOM quality, the percentage of active FA needed to fit modelled and measured free metal concentrations was compared with the lake-to-lake variation in the spectroscopic quality of the DOM, as determined by absorbance and fluorescence measurements. Relationships between the percentage of active FA and DOM quality were apparent for Cd, Cu, Ni and Zn, suggesting the possibility of estimating the percentage of active FA spectroscopically and then using this information to refine model predictions. The relationships for Ni differed markedly from those observed for the other metals,suggesting that the DOM binding sites active in Cd, Cu and Zn complexation are different from those involved in Ni complexation. To our knowledge, this is the first time that such a distinction has been resolved in natural water samples.

Published
2012

185. Critical review of thallium in aquatic ecosystems.

Author

Couture, Patrice, Fortin, Claude, Hare, Landis, Lapointe, Dominique, Pitre, Danaé, Couture, Patrice, Fortin, Claude, Hare, Landis, Lapointe, Dominique, and Pitre, Danaé

Published
2011

190. Suivi des impacts de la coupe forestière sur la physico-chimie et le régime hydrologique des lacs alcalins de la réserve faunique des Chic-Chocs : 3ième année d'activités : Rapport annuel.

Author

Fortin, Claude, Robin, Marc-André, Jutras, Sylvain, Rousseau, Alain N., Fortin, Claude, Robin, Marc-André, Jutras, Sylvain, and Rousseau, Alain N.

Abstract

Les lacs de la région des Chic-Chocs ont des pH élevés (pH > 7,5). Cette condition naturelle s’explique par la nature calcaire de la roche mère. Les effets de la récolte forestière dans ce type de condition géologique sont peu documentés. Le but de cette étude est de connaître les effets de la récolte forestière sur la physico-chimie et le régime hydrologique des lacs alcalins des Chic-Chocs. Une attention particulière est portée au pH, étant donné que le pH des lacs alcalins se situe près de la limite supérieure de survie des poissons (pH = 9). Une étude par comparaison de bassins versants jumelés d’une période de quatre ans (2007 - 2008 : période de calibration, 2009 – 2010 : période post-traitement) a été mise en place. Trois paires de lacs aux caractéristiques semblables ont été choisies; une paire de lacs étant constituée d’un lac témoin et d’un lac traité (c’est-à-dire, soumis à la récolte forestière sur son bassin versant). Quelques paramètres physico-chimiques sont mesurés sur le terrain (pH, oxygène dissous, température) et en laboratoire avec des échantillons (cations majeurs totaux et dissous, carbone organique et inorganique dissous, Chl a, turbidité). Le régime hydrologique est estimé avec un suivi volumétrique des lacs. Ce suivi est réalisé par la combinaison de levés bathymétriques et de mesures de hauteur d’eau, recueillies avec un capteur de pression. Bien que l’incertitude soit encore élevée en raison du faible nombre d’échantillons, aucun effet significatif sur le pH et le volume n’ont été enregistrés sur deux des trois paires de lacs, un an après la récolte. La dernière saison d’échantillonnage (2010) permettra d’augmenter la puissance statistique de l’étude et d’obtenir les résultats pour la troisième paire de lacs.

Published
2010

192. Vulnerability and tolerance to nickel of periphytic biofilm harvested in summer and winter.

Author

Laderriere, Vincent, Morin, Soizic, Eon, Mélissa, and Fortin, Claude

Subjects
BIOTIC communities, BIOFILMS, HARVESTING, MICROBIAL communities, COMMUNITIES, SUMMER, WINTER
Abstract

Metals are naturally present in freshwater ecosystems but anthropogenic activities like mining operations represent a long-standing concern. Metals released into aquatic environments may affect microbial communities such as periphytic biofilm, which plays a key role as a primary producer in stream ecosystems. Using two 28-day microcosm studies involving two different photoperiods (light/dark cycle of 16/8 vs 8/16), the present study assessed the effects of four increasing nickel (Ni) concentrations (0–6 μM) on two natural biofilm communities collected at different seasons (summer and winter). The two communities were characterized by different structural profiles and showed significant differences in Ni accumulated content for each treatment. For instance, the biofilm metal content was four times higher in the case of summer biofilm at the highest Ni treatment and after 28 days of exposure. Biomarkers examined targeted both heterotrophic and autotrophic organisms. For heterotrophs, the β-glucosidase and β-glucosaminidase showed no marked effects of Ni exposure and were globally similar between the two communities suggesting low toxicity. However, the photosynthetic yield confirmed the toxicity of Ni on autotrophs with maximum inhibition of 81 ± 7% and 60 ± 1% respectively for the summer and winter biofilms. Furthermore, biofilms previously exposed to the highest long-term Ni concentration ([Ni2+] = 6 μM) revealed no acute effects in subsequent toxicity based on the PSII yield, suggesting a tolerance acquisition by the phototrophic community. Taken together, the results suggest that the biofilm response to Ni exposure was dependent of the function considered and that descriptors such as biofilm metal content could be seasonally dependent, information of great importance in a context of biomonitoring. [Display omitted] • Two natural biofilms originating from two seasons were exposed to Ni in microcosms. • The two communities showed different structural and functional characteristics. • Both nickel accumulation and toxicity responses differed between the two biofilms. • Responses of natural microbial communities can be seasonally dependent. • 6 μM of Ni2+ was sufficient to induce tolerance acquisition of the two communities. [ABSTRACT FROM AUTHOR]

Published
2022
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