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Author Sargent, B.A.; Srinivasan, S.; Speck, A.; Volk, K.; Kemper, C.; Reach, W.T.; Lagadec, E.; Bernard, J.-P.; McDonald, I.; Meixner, M.
Title Spitzer-IRS Spectroscopic Studies of Oxygen-Rich Asymptotic Giant Branch Star and Red Supergiant Star Dust Properties Type Conference Article
Year 2015 Publication (up) Abbreviated Journal
Volume Issue Pages 216.03-216.03
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Abstract
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title American Astronomical Society Meeting Abstracts
Series Volume 225 Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes proceedings Approved no
Call Number ASIAA @ ciska @ Serial 41812
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Author Sloan, G.C.; Groenewegen, M.; Srinivasan, S.; Lagadec, E.; Kraemer, K.E.; McDonald, I.; Boyer, M.L.; Zijlstra, A.; Kemper, C.
Title Dust and metallicity in carbon stars Type Conference Article
Year 2015 Publication (up) Abbreviated Journal
Volume Issue Pages 216.04-216.04
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Abstract
Address
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title American Astronomical Society Meeting Abstracts
Series Volume 225 Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes proceedings Approved no
Call Number ASIAA @ ciska @ Serial 41813
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Author Sargent, B.A.; Srinivasan, S.; Speck, A.; Volk, K.; Kemper, C.; Reach, W.T.; Lagadec, E.; Bernard, J.-P.; McDonald, I.; Meixner, M.
Title Spitzer-IRS Spectroscopic Studies of Oxygen-Rich Asymptotic Giant Branch Star and Red Supergiant Star Dust Properties Type Conference Article
Year 2015 Publication (up) Abbreviated Journal
Volume Issue Pages 216.03-216.03
Keywords
Abstract We analyze the dust emission features seen in Spitzer Space Telescope Infrared Spectrograph (IRS) spectra of Oxygen-rich (O-rich) asymptotic giant branch (AGB) and red supergiant (RSG) stars. The spectra come from the Spitzer Legacy program SAGE-Spectroscopy (PI: F. Kemper) and other archival Spitzer-IRS programs. The broad 10 and 20 micron emission features attributed to amorphous dust of silicate composition seen in the spectra show evidence for systematic differences in the centroid of both emission features between O-rich AGB and RSG populations. Radiative transfer modeling using the GRAMS grid of models of AGB and RSG stars suggests that the centroid differences are due to differences in dust properties. We present an update of our investigation of differences in dust composition, size, shape, etc that might be responsible for these spectral differences. We explore how these differences may arise from the different circumstellar environments around RSG and O-rich AGB stars. BAS acknowledges funding from NASA ADAP grant NNX13AD54G.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title American Astronomical Society Meeting Abstracts
Series Volume 225 Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes proceedings; Owner: ciska; Added to JabRef: 2015.04.16 Approved no
Call Number ASIAA @ ciska @ Serial 42059
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Author Sloan, G.C.; Groenewegen, M.; Srinivasan, S.; Lagadec, E.; Kraemer, K.E.; McDonald, I.; Boyer, M.L.; Zijlstra, A.; Kemper, C.
Title Dust and metallicity in carbon stars Type Conference Article
Year 2015 Publication (up) Abbreviated Journal
Volume Issue Pages 216.04-216.04
Keywords
Abstract The Infrared Spectrograph on the Spitzer Space Telescope observed over 200 carbon stars in nearby metal-poor dwarf galaxies. These spectra probe how the quantity and composition of dust produced by carbon stars depend on initial metallicity, initial mass, and pulsational properties. For stars to produce significant quantities of dust, they must be pulsating in the fundamental mode with strong amplitudes. The spectra confirm that carbon stars with longer pulsation periods produce more dust and that the amount of dust shows no strong dependence on metallicity. This sample includes more carbon stars with low mass and reveals that for a given pulsation period, higher-mass stars produce less dust. Evidence is building for the layering of dust grains, with SiC cores in grains produced by metal-rich carbon stars, and mantles of MgS around grains in all embedded stars.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title American Astronomical Society Meeting Abstracts
Series Volume 225 Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes proceedings; Owner: ciska; Added to JabRef: 2015.04.16 Approved no
Call Number ASIAA @ ciska @ Serial 42063
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Author Steenweg, R.J.; Hennin, H.L.; Bêty, J.; Gilchrist, H.G.; Williams, T.D.; Crossin, G.T.; Love, O.P.
Title Sources of diel variation in energetic physiology in an Arctic-breeding, diving seaduck Type Journal Article
Year 2015 Publication (up) Abbreviated Journal General and Comparative Endocrinology
Volume 216 Issue Pages 39-45
Keywords Arctic; Corticosterone; Diel rhythm; Energetic physiology; Sea duck; Triglyceride
Abstract Diel variation in baseline glucocorticoid (GC) secretion influences energetics and foraging behaviors. In temperate breeding, diurnal vertebrates, studies have shown that daily patterns of baseline GC secretion are influenced by environmental photoperiod, with baseline GCs peaking prior to sunrise to stimulate waking and foraging behaviors. Measures of physiological energy acquisition are also expected to peak in response to foraging activity, but their relationship to GC levels have not been well studied. In contrast to temperate breeding species, virtually nothing is known about diel GC and energetic metabolite secretion in Arctic breeding species, which experience almost constant photoperiods in spring and summer. Using a ten-year dataset, we examined the daily, 24-h pattern of baseline corticosterone (CORT) and triglyceride (TRIG) secretion in approximately 800 female pre-breeding Arctic-nesting common eiders (. Somateria mollissima). We related these traits to environmental photoperiod and to tidal cycle. In contrast to temperate breeding species, we found that that neither time of day nor tidal trend predicted diel variation in CORT or TRIG secretion in Arctic-breeding eiders. Given the narrow window of opportunity for breeding in polar regions, we suggest that eiders must decouple their daily foraging activity from light and tidal cycles if they are to accrue sufficient energy for successful breeding. As CORT is known to influence foraging behavior, the absence of a distinct diel pattern of CORT secretion may therefore be an adaptation to optimize reproductive investment and likelihood for success in some polar-breeding species. © 2015 Elsevier Inc.
Address Simon Fraser University, Burnaby, BC, Canada
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Notes Export Date: 17 March 2016 Approved no
Call Number McgGll @ elizabethburgess @ Serial 42530
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Author Hennin, H.L.; Legagneux, P.; Bêty, J.; Williams, T.D.; Grant Gilchrist, H.; Baker, T.M.; Love, O.P.
Title Pre-breeding energetic management in a mixed-strategy breeder Type Journal Article
Year 2015 Publication (up) Abbreviated Journal Oecologia
Volume 177 Issue 1 Pages 235-243
Keywords Breeding threshold; Corticosterone; Energetic management; Energetic metabolites; Mixed-strategy breeder
Abstract Integrative biologists have long appreciated that the effective acquisition and management of energy prior to breeding should strongly influence fitness-related reproductive decisions (timing of breeding and reproductive investment). However, because of the difficulty in capturing pre-breeding individuals, and the tendency towards abandonment of reproduction after capture, we know little about the underlying mechanisms of these life-history decisions. Over 10 years, we captured free-living, arctic-breeding common eiders (Somateria mollissima) up to 3 weeks before investment in reproduction. We examined and characterized physiological parameters predicted to influence energetic management by sampling baseline plasma glucocorticoids (i.e., corticosterone), very-low-density lipoprotein (VLDL), and vitellogenin (VTG) for their respective roles in mediating energetic balance, rate of condition gain (physiological fattening rate) and reproductive investment. Baseline corticosterone increased significantly from arrival to the initiation of reproductive investment (period of rapid follicular growth; RFG), and showed a positive relationship with body mass, indicating that this hormone may stimulate foraging behaviour to facilitate both fat deposition and investment in egg production. In support of this, we found that VLDL increased throughout the pre-breeding period, peaking as predicted during RFG. Female eiders exhibited unprecedentedly high levels of VTG well before their theoretical RFG period, a potential strategy for pre-emptively depositing available protein stores into follicles while females are simultaneously fattening. This study provides some of the first data examining the temporal dynamics and interaction of the energetic mechanisms thought to be at the heart of individual variation in reproductive decisions and success in many vertebrate species. © 2014, Springer-Verlag Berlin Heidelberg.
Address Environment Canada, National Wildlife Research Centre, Carleton University, Ottawa, ON, Canada
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Notes Cited By :1; Export Date: 17 March 2016 Approved no
Call Number McgGll @ elizabethburgess @ Serial 42531
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Author Émond, K.; Sainte-Marie, B.; Galbraith, P.S.; Bêty, J.
Title Top-down vs. bottom-up drivers of recruitment in a key marine invertebrate: Investigating early life stages of snow crab Type Journal Article
Year 2015 Publication (up) Abbreviated Journal ICES Journal of Marine Science
Volume 72 Issue 5 Pages 1336-1348
Keywords cannibalism; climate; groundfish predation; larval production; population dynamics; recruitment; snow crab
Abstract Many snow crab fisheries have fluctuated widely over time in a quasi-cyclic way due to highly variable recruitment. The causes of this variability are still debated. Bottom-up processes related to climate variability may strongly affect growth and survival during early life, whereas top-down predator effects may be a major source of juvenile mortality. Moreover, intrinsic density-dependent processes, which have received much less attention, are hypothetically responsible for the cycles in recruitment. This study explored how climate, larval production, intercohort cannibalism and groundfish predation may have affected recruitment of early juvenile snow crab in the northwest Gulf of St Lawrence (eastern Canada) over a period of 23 years. Abundance of early juvenile snow crabs (2.5-22.9 mm in carapace width), representing the first 3 years of benthic life, came from an annual trawl survey and was used to determine cohort strength. Analyses revealed a cyclic pattern in abundance of 0+ crabs that may arise from cohort resonant effects. This pattern consisted of three recruitment pulses but was reduced to two pulses by age 2+, while the interannual variability of cohort strength was dampened. This reconfiguration of the earliest recruitment pattern was dictated primarily by bottom water temperature and cannibalism, which progressively overruled the pre-settlement factors of larval production and surface water temperature that best explained abundance of 0+ crabs. The results strongly suggest that bottom-up and density-dependent processes prevail over top-down control in setting the long-term trends and higher-frequency oscillations of snow crab early recruitment patterns. © 2015 International Council for the Exploration of the Sea 2015. All rights reserved. For Permissions, please email: journals.permissions@oup.com.
Address Department of Fisheries and Oceans, Maurice Lamontagne Institute, 850 Route de la Mer, Mont-Joli, QC, Canada
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Notes Export Date: 17 March 2016 Approved no
Call Number McgGll @ elizabethburgess @ Serial 42532
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Author Calignano, F.; Tommasi, T.; Manfredi, D.; Chiolerio, A.
Title Additive Manufacturing of a Microbial Fuel Cell – A detailed study Type Journal Article
Year 2015 Publication (up) Abbreviated Journal Scientific Reports
Volume 5 Issue Pages
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Notes Cited By :1; Export Date: 2 November 2016 Approved no
Call Number IIT-CSF @ alessandro.chiolerio @ Serial 42774
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Author Laurenti, M.; Verna, A.; Chiolerio, A.
Title Evidence of Negative Capacitance in Piezoelectric ZnO Thin Films Sputtered on Interdigital Electrodes Type Journal Article
Year 2015 Publication (up) Abbreviated Journal ACS Applied Materials and Interfaces
Volume 7 Issue 44 Pages 24470-24479
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Notes Cited By :6; Export Date: 2 November 2016 Approved no
Call Number IIT-CSF @ alessandro.chiolerio @ Serial 42775
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Author Roppolo, I.; Chiappone, A.; Boggione, L.; Castellino, M.; Bejtka, K.; Pirri, C.F.; Sangermano, M.; Chiolerio, A.
Title Self-standing polymer-functionalized reduced graphene oxide papers obtained via a UV-process Type Journal Article
Year 2015 Publication (up) Abbreviated Journal RSC Advances
Volume 5 Issue 116 Pages 95805-95812
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Notes Cited By :2; Export Date: 2 November 2016 Approved no
Call Number IIT-CSF @ alessandro.chiolerio @ Serial 42776
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