108 results on '"Peck V"'
Search Results
2. Elk, Cervus elaphus, habitat use related to prescribed fire, Tuchodi River, British Columbia
- Author
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Peck, V. Ross, Peek, James M., and New York Botanical Garden, LuEsther T. Mertz Library
- Published
- 1991
3. Antiphased dust deposition and productivity in the Antarctic Zone over 1.5 million years
- Author
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Weber, M.E., Bailey, I., Hemming, S.R., Martos, Y.M., Reilly, B.T., Ronge, T.A., Brachfeld, S., Williams, T., Raymo, M., Belt, M., Smik, L., vogel, H., Peck, V., Armbrecht, L., Cage, A., Cardillo, F.G., Du, Z., Fauth, G., Fogwill, C.J., and García-García, M. (Margarita)
- Subjects
carbon ,carbon cycle ,pleistocene ,Medio Marino ,Centro Oceanográfico de Cádiz ,ice ages ,antarctic zone - Abstract
The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages and their role in influencing the carbon cycle. We report a high-resolution record of dust deposition and ocean productivity for the Antarctic Zone, close to the main dust source, Patagonia. Our deep-ocean records cover the last 1.5 Ma, thus doubling that from Antarctic ice-cores. We find a 5 to 15-fold increase in dust deposition during glacials and a 2 to 5-fold increase in biogenic silica deposition, reflecting higher ocean productivity during interglacials. This antiphasing persisted throughout the last 25 glacial cycles. Dust deposition became more pronounced across the Mid-Pleistocene Transition (MPT) in the Southern Hemisphere, with an abrupt shift suggesting more severe glaciations since ~0.9 Ma. Productivity was intermediate pre-MPT, lowest during the MPT and highest since 0.4 Ma. Generally, glacials experienced extended sea-ice cover, reduced bottom-water export and Weddell Gyre dynamics, which helped lower atmospheric CO2 levels., SI
- Published
- 2022
4. Latitudinal Variance in the Drivers and Pacing of Warmth During Mid-Pleistocene MIS 31 in the Antarctic Zone of the Southern Ocean
- Author
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Warnock, J.P., Reilly, B.T., Raymo, M.E., Weber, M.E., Peck, V., Williams, T., Armbrecht, L., Bailey, I., Brachfeld, S., Fauth, G., García-García, Margarita, et al., Warnock, J.P., Reilly, B.T., Raymo, M.E., Weber, M.E., Peck, V., Williams, T., Armbrecht, L., Bailey, I., Brachfeld, S., Fauth, G., García-García, Margarita, and et al.
- Abstract
Early Pleistocene Marine Isotope Stage (MIS)-31 (1.081–1.062 Ma) is a unique interval of extreme global warming, including evidence of a West Antarctic Ice Sheet (WAIS) collapse. Here we present a new 1,000-year resolution, spanning 1.110–1.030 Ma, diatom-based reconstruction of primary productivity, relative sea surface temperature changes, sea-ice proximity/open ocean conditions and diatom species absolute abundances during MIS-31, from the Scotia Sea (59°S) using deep-sea sediments collected during International Ocean Discovery Program (IODP) Expedition 382. The lower Jaramillo magnetic reversal (base of C1r.1n, 1.071 Ma) provides a robust and independent time-stratigraphic marker to correlate records from other drill cores in the Antarctic Zone of the Southern Ocean (AZSO). An increase in open ocean species Fragilariopsis kerguelensis in early MIS-31 at 53°S (Ocean Drilling Program Site 1,094) correlates with increased obliquity forcing, whereas at 59°S (IODP Site U1537; this study) three progressively increasing, successive peaks in the relative abundance of F. kerguelensis correlate with Southern Hemisphere-phased precession pacing. These observations reveal a complex pattern of ocean temperature change and sustained sea surface temperature increase lasting longer than a precession cycle within the Atlantic sector of the AZSO. Timing of an inferred WAIS collapse is consistent with delayed warmth (possibly driven by sea-ice dynamics) in the southern AZSO, supporting models that indicate WAIS sensitivity to local sub-ice shelf melting. Anthropogenically enhanced impingement of relatively warm water beneath the ice shelves today highlights the importance of understanding dynamic responses of the WAIS during MIS-31, a warmer than Holocene interglacial.
- Published
- 2022
5. Toxic Effects of Acute Glutathione Depletion by Buthionine Sulfoximine and Dimethylfumarate on Murine Mammary Carcinoma Cells
- Author
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Dethlefsen, L. A., Lehman, C. M., Biaglow, J. E., and Peck, V. M.
- Published
- 1988
- Full Text
- View/download PDF
6. Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP
- Author
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Peck, V. L., Hall, I. R., Zahn, R., and Elderfield, H.
- Abstract
We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (delta O-18) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum-North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and delta O-18 across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling.
- Published
- 2021
7. Archaeal intact polar lipids in polar waters: A comparison between the Amundsen and Scotia seas
- Author
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Spencer-Jones, C.L., McClymont, E.L., Bale, N.J., Hopmans, E.C., Schouten, S., Müller, J., Abrahamsen, E.P., Allen, C., Bickert, T., Hillenbrand, C.-D., Mawbey, E., Peck, V., Svalova, A., Smith, J.A., Spencer-Jones, C.L., McClymont, E.L., Bale, N.J., Hopmans, E.C., Schouten, S., Müller, J., Abrahamsen, E.P., Allen, C., Bickert, T., Hillenbrand, C.-D., Mawbey, E., Peck, V., Svalova, A., and Smith, J.A.
- Abstract
The West Antarctic Ice Sheet (WAIS) is one of the largest potential sources of future sea-level rise, with glaciers draining the WAIS thinning at an accelerating rate over the past 40 years. Due to complexities in calibrating palaeoceanographic proxies for the Southern Ocean, it remains difficult to assess whether similar changes have occurred earlier during the Holocene or whether there is underlying centennial- to millennial-scale forcing in oceanic variability. Archaeal lipid-based proxies, specifically glycerol dialkyl glycerol tetraether (GDGT; e.g. TEX86 and TEX), are powerful tools for reconstructing ocean temperature, but these proxies have been shown previously to be difficult to apply to the Southern Ocean. A greater understanding of the parameters that control Southern Ocean GDGT distributions would improve the application of these biomarker proxies and thus help provide a longer-term perspective on ocean forcing of Antarctic ice sheet changes. In this study, we characterised intact polar lipid (IPL)-GDGTs, representing (recently) living archaeal populations in suspended particulate matter (SPM) from the Amundsen Sea and the Scotia Sea. SPM samples from the Amundsen Sea were collected from up to four water column depths representing the surface waters through to Circumpolar Deep Water (CDW), whereas the Scotia Sea samples were collected along a transect encompassing the sub-Antarctic front through to the southern boundary of the Antarctic Circumpolar Current. IPL-GDGTs with low cyclic diversity were detected throughout the water column with high relative abundances of hydroxylated IPL-GDGTs identified in both the Amundsen and Scotia seas. Results from the Scotia Sea show shifts in IPL-GDGT signatures across well-defined fronts of the Southern Ocean. Indicating that the physicochemical parameters of these water masses determine changes in IPL-GDGT distributions. The Amundsen Sea results identified GDGTs with hexose-phosphohexose head groups in the CDW, sug
- Published
- 2021
8. Expedition 382 summary.
- Author
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Weber, M. E., Raymo, M. E., Peck, V. L., Williams, T., Armbrecht, L. H., Bailey, I., Brachfeld, S. A., Cardillo, F. G., Du, Z., Fauth, G., García, M., Glüder, A., Guitard, M. E., Gutjahr, M., Hemming, S. R., Hernández-Almeida, I., Hoem, F. S., Hwang, J.-H., Iizuka, M., and Kato, Y.
- Subjects
ATMOSPHERIC carbon dioxide ,CLIMATE change ,ATMOSPHERIC circulation - Abstract
International Ocean Discovery Program Expedition 382, Iceberg Alley and Subantarctic Ice and Ocean Dynamics, investigated the long-term climate history of Antarctica, seeking to understand how polar ice sheets responded to changes in insolation and atmospheric CO2 in the past and how ice sheet evolution influenced global sea level and vice versa. Five sites (U1534-U1538) were drilled east of the Drake Passage: two sites at 53.2°S at the northern edge of the Scotia Sea and three sites at 57.4°-59.4°S in the southern Scotia Sea. We recovered continuously deposited late Neogene sediments to reconstruct the past history and variability in Antarctic Ice Sheet (AIS) mass loss and associated changes in oceanic and atmospheric circulation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
9. Site U1538.
- Author
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Weber, M. E., Raymo, M. E., Peck, V. L., Williams, T., Armbrecht, L. H., Bailey, I., Brachfeld, S. A., Cardillo, F. G., Du, Z., Fauth, G., García, M., Glüder, A., Guitard, M. E., Gutjahr, M., Hemming, S. R., Hernández-Almeida, I., Hoem, F. S., Hwang, J.-H., Iizuka, M., and Kato, Y.
- Subjects
OCEAN dynamics ,ICEBERGS ,SEA level ,PALEOCEANOGRAPHY ,PALEOCLIMATOLOGY - Published
- 2021
- Full Text
- View/download PDF
10. Site U1534.
- Author
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Peck, V. L., Weber, M. E., Raymo, M. E., Williams, T., Armbrecht, L. H., Bailey, I., Brachfeld, S. A., Cardillo, F. G., Du, Z., Fauth, G., García, M., Glüder, A., Guitard, M. E., Gutjahr, M., Hemming, S. R., Hernández-Almeida, I., Hoem, F. S., Hwang, J.-H., Iizuka, M., and Kato, Y.
- Subjects
OCEAN dynamics ,PALEOCEANOGRAPHY ,PALEOCLIMATOLOGY - Published
- 2021
- Full Text
- View/download PDF
11. Expedition 382 methods.
- Author
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Weber, M. E., Raymo, M. E., Peck, V. L., Williams, T., Armbrecht, L. H., Bailey, I., Brachfeld, S. A., Cardillo, F. G., Du, Z., Fauth, G., García, M., Glüder, A., Guitard, M. E., Gutjahr, M., Hemming, S. R., Hernández-Almeida, I., Hoem, F. S., Hwang, J.-H., Iizuka, M., and Kato, Y.
- Subjects
OCEAN dynamics ,GLOBAL Positioning System ,DRILL pipe ,DATA analysis - Published
- 2021
- Full Text
- View/download PDF
12. Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death
- Author
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Oakes, R. L., primary, Peck, V. L., additional, Manno, C., additional, and Bralower, T. J., additional
- Published
- 2019
- Full Text
- View/download PDF
13. Consistently dated Atlantic sediment cores over the last 40 thousand years
- Author
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Waelbroeck, C, Lougheed, BC, Vazquez Riveiros, N, Missiaen, L ; https://orcid.org/0000-0002-0679-1347, Pedro, J, Dokken, T, Hajdas, I, Wacker, L, Abbott, P, Dumoulin, JP, Thil, F, Eynaud, F, Rossignol, L, Fersi, W, Albuquerque, AL, Arz, H, Austin, WEN, Came, R, Carlson, AE, Collins, JA, Dennielou, B, Desprat, S, Dickson, A, Elliot, M, Farmer, C, Giraudeau, J, Gottschalk, J, Henderiks, J, Hughen, K, Jung, S, Knutz, P, Lebreiro, S, Lund, DC, Lynch-Stieglitz, J, Malaizé, B, Marchitto, T, Martínez-Méndez, G, Mollenhauer, G, Naughton, F, Nave, S, Nürnberg, D, Oppo, D, Peck, V, Peeters, FJC, Penaud, A, Portilho-Ramos, RDC, Repschläger, J, Roberts, J, Rühlemann, C, Salgueiro, E, Sanchez Goni, MF, Schönfeld, J, Scussolini, P, Skinner, LC, Skonieczny, C, Thornalley, D, Toucanne, S, Rooij, DV, Vidal, L, Voelker, AHL, Wary, M, Weldeab, S, Ziegler, M, Waelbroeck, C, Lougheed, BC, Vazquez Riveiros, N, Missiaen, L ; https://orcid.org/0000-0002-0679-1347, Pedro, J, Dokken, T, Hajdas, I, Wacker, L, Abbott, P, Dumoulin, JP, Thil, F, Eynaud, F, Rossignol, L, Fersi, W, Albuquerque, AL, Arz, H, Austin, WEN, Came, R, Carlson, AE, Collins, JA, Dennielou, B, Desprat, S, Dickson, A, Elliot, M, Farmer, C, Giraudeau, J, Gottschalk, J, Henderiks, J, Hughen, K, Jung, S, Knutz, P, Lebreiro, S, Lund, DC, Lynch-Stieglitz, J, Malaizé, B, Marchitto, T, Martínez-Méndez, G, Mollenhauer, G, Naughton, F, Nave, S, Nürnberg, D, Oppo, D, Peck, V, Peeters, FJC, Penaud, A, Portilho-Ramos, RDC, Repschläger, J, Roberts, J, Rühlemann, C, Salgueiro, E, Sanchez Goni, MF, Schönfeld, J, Scussolini, P, Skinner, LC, Skonieczny, C, Thornalley, D, Toucanne, S, Rooij, DV, Vidal, L, Voelker, AHL, Wary, M, Weldeab, S, and Ziegler, M
- Abstract
Rapid changes in ocean circulation and climate have been observed in marine-sediment and ice cores over the last glacial period and deglaciation, highlighting the non-linear character of the climate system and underlining the possibility of rapid climate shifts in response to anthropogenic greenhouse gas forcing. To date, these rapid changes in climate and ocean circulation are still not fully explained. One obstacle hindering progress in our understanding of the interactions between past ocean circulation and climate changes is the difficulty of accurately dating marine cores. Here, we present a set of 92 marine sediment cores from the Atlantic Ocean for which we have established age-depth models that are consistent with the Greenland GICC05 ice core chronology, and computed the associated dating uncertainties, using a new deposition modeling technique. This is the first set of consistently dated marine sediment cores enabling paleoclimate scientists to evaluate leads/lags between circulation and climate changes over vast regions of the Atlantic Ocean. Moreover, this data set is of direct use in paleoclimate modeling studies.
- Published
- 2019
14. Fine Structure of Metallic Surfaces with the Electron Microscope.
- Author
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Heidenreich, R. D. and Peck, V. G.
- Published
- 1943
- Full Text
- View/download PDF
15. Health system barriers and facilitators to medication adherence for the secondary prevention of cardiovascular disease: A systematic review
- Author
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Werba, J.P., primary, Khandelwal, S., additional, Nambiar, L., additional, Saxena, M., additional, Peck, V., additional, Moniruzzaman, M., additional, Rocha Faria Neto, J., additional, Curi Quinto, K., additional, Leong, D., additional, and Banerjee, A., additional
- Published
- 2017
- Full Text
- View/download PDF
16. RETRACTED: Atypical incomplete femoral fractures in asymptomatic patients on long term bisphosphonate therapy
- Author
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Allison, M.B., Markman, L., Rosenberg, Z., Vieira, R.L., Babb, J., Tejwani, N., and Peck, V.
- Published
- 2013
- Full Text
- View/download PDF
17. Effects of acute ocean acidification on spatially-diverse polar pelagic foodwebs: insights from on-deck microcosms
- Author
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Tarling, G.A., Peck, V., Ward, P., Ensor, N.S., Achterberg, E., Tynan, E., Poulton, A.J., Mitchell, E., Zubkov, M.V., Tarling, G.A., Peck, V., Ward, P., Ensor, N.S., Achterberg, E., Tynan, E., Poulton, A.J., Mitchell, E., and Zubkov, M.V.
- Abstract
The polar oceans are experiencing some of the largest levels of ocean acidification (OA) resulting from the uptake of anthropogenic carbon dioxide (CO2). Our understanding of the impacts this is having on polar marine communities is mainly derived from studies of single species in laboratory conditions, while the consequences for food web interactions remain largely unknown. This study carried out experimental manipulations of natural pelagic communities at different high latitude sites in both the northern (Nordic Seas) and southern hemispheres (Scotia and Weddell Seas). The aim of this study was to identify more generic responses and greater experimental reproducibility through implementing a series of short term (4 day), multilevel (3 treatment) carbonate chemistry manipulation experiments on unfiltered natural surface ocean communities, including grazing copepods. The experiments were successfully executed at six different sites, covering a diverse range of environmental conditions and differing plankton community compositions. The study identified the interaction between copepods and dinoflagellate cell abundance to be significantly altered by elevated levels of dissolved CO2 (pCO2), with dinoflagellates decreasing relative to ambient conditions across all six experiments. A similar pattern was not observed in any other major phytoplankton group. The patterns indicate that copepods show a stronger preference for dinoflagellates when in elevated pCO2 conditions, demonstrating that changes in food quality and altered grazing selectivity may be a major consequence of ocean acidification. The study also found that transparent exopolymeric particles (TEP) generally increased when pCO2 levels were elevated, but the response was dependent on the exact set of environmental conditions. Bacteria and nannoplankton showed a neutral response to elevated pCO2 and there was no significant relationship between changes in bacterial or nannoplankton abundance and that of TEP con
- Published
- 2016
18. Effects of acute ocean acidification on spatially-diverse polar pelagic foodwebs: Insights from on-deck microcosms
- Author
-
Tarling, G. A., Peck, V., Ward, P., Ensor, N. S., Achterberg, Eric P., Tynan, E., Poulton, A. J., Mitchell, E., Zubkov, M. V., Tarling, G. A., Peck, V., Ward, P., Ensor, N. S., Achterberg, Eric P., Tynan, E., Poulton, A. J., Mitchell, E., and Zubkov, M. V.
- Abstract
The polar oceans are experiencing some of the largest levels of ocean acidification (OA) resulting from the uptake of anthropogenic carbon dioxide (CO2). Our understanding of the impacts this is having on polar marine communities is mainly derived from studies of single species in laboratory conditions, while the consequences for food web interactions remain largely unknown. This study carried out experimental manipulations of natural pelagic communities at different high latitude sites in both the northern (Nordic Seas) and southern hemispheres (Scotia and Weddell Seas). The aim of this study was to identify more generic responses and achieve greater experimental reproducibility through implementing a series of short term (4 d), multilevel (3 treatment) carbonate chemistry manipulation experiments on unfiltered natural surface-ocean communities, including grazing copepods. The experiments were successfully executed at six different sites, covering a diverse range of environmental conditions and differing plankton community compositions. The study identified the interaction between copepods and dinoflagellate cell abundance to be significantly altered by elevated levels of dissolved CO2 (pCO(2)), with dinoflagellates decreasing relative to ambient conditions across all six experiments. A similar pattern was not observed in any other major phytoplankton group. The patterns indicate that copepods show a stronger preference for dinoflagellates when in elevated pCO(2) conditions, demonstrating that changes in food quality and altered grazing selectivity may be a major consequence of ocean acidification. The study also found that transparent exopolymeric particles (TEP) generally increased when pCO(2) levels were elevated, but the response was dependent on the exact set of environmental conditions. Bacteria and nannoplankton showed a neutral response to elevated pCO(2) and there was no significant relationship between changes in bacterial or nannoplanlcton abundance and
- Published
- 2016
- Full Text
- View/download PDF
19. OC06_03 An International Pilot Study of the Barriers and Facilitators to the Use of Evidence Based Drugs in the Secondary Prevention of Cardiovascular Diseases
- Author
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Khandelwal, S., primary, Peck, V., additional, Nambiar, L., additional, Saxena, M., additional, Leong, D., additional, Banerjee, A., additional, Werba, J.P., additional, Neto, J.R.F., additional, Moniruzzaman, M., additional, and Quinto, K.C., additional
- Published
- 2016
- Full Text
- View/download PDF
20. PS205 Health System Barriers to and Facilitators of Adherence to Medications for the Secondary Prevention of Cardiovascular Disease: A Systematic Review
- Author
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Banerjee, A., primary, Werba, J.P., additional, Neto, J.R.F., additional, Nambiar, L., additional, Saxena, M., additional, Peck, V., additional, Moniruzzaman, M., additional, Quinto, K.C., additional, Khandelwal, S., additional, and Leong, D., additional
- Published
- 2016
- Full Text
- View/download PDF
21. Progressive reduction in NE Atlantic intermediate water ventilation prior to Heinrich events: Response to NW European ice sheet instabilities?
- Author
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Peck, V. L., Hall, Ian R., Zahn, Rainer, and Scourse, J. D.
- Subjects
Heinrich events ,Atlantic thermohaline circulation ,benthic carbon isotopes ,meltwater forcing - Abstract
We present high-resolution benthic delta C-13 records from intermediate water depth core site MD01-2461 ( 1153 m water depth), from the Porcupine Seabight, NE Atlantic, spanning 43 to 8 kyr B. P. At an average proxy time step of 160 +/- 56 years this core provides information on the linkage between records from the Portuguese Margin and high-latitude North Atlantic basin, allowing additional insights into North Atlantic thermohaline circulation (THC) variability during millennial-scale climatic events of the last glacial. Together, these records document both discrete and progressive reductions in Glacial North Atlantic Intermediate Water (GNAIW) formation preceding Heinrich ( H) events 1, 2, and 4, recorded through the apparent interchange of glacial northern and southern-sourced intermediate water signatures along the European Margin. Close coupling of NW European ice sheet (NWEIS) instability and GNAIW formation is observed through transient advances of SCW along the European margin concurrent with pulses of ice-rafted debris and meltwater release into the NE Atlantic between 27 and 16 kyr B. P., when the NWEIS was at maximum extent and proximal to Last Glacial Maximum convection zones in the open North Atlantic. It is such NWEIS instability and meltwater forcing that may have triggered reduced North Atlantic THC prior to collapse of the Laurentide ice sheet at H1 and H2. Precursory reduction in GNAIW formation prior to H4 may also be inferred. However, limited NWEIS ice volume prior to H4 and convection occurring in the Norwegian-Greenland Sea require that if a meltwater trigger is invoked, as appears to be the case at H1 and H2, the source of meltwater prior to H4 is elsewhere, likely higher-latitude ice sheets. Clarification of the sequencing and likely mechanisms of precursory decrease of the North Atlantic THC support theories of H event initiation relating to ice shelf growth during cold periods associated with reduced North Atlantic THC and subsequent ablation through subsurface warming and sea level rise associated with further reductions in meridional overturning.
- Published
- 2007
22. A low-cost computerized card system for the collection of sensory data
- Author
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McLellan, M.R., Hoo, A.F., and Peck V.
- Subjects
Product development -- Research ,Food habits -- Research ,Sensory evaluation -- Methods ,Plastic transaction cards ,Business ,Food and beverage industries - Published
- 1987
23. Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago
- Author
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Hall, I. R., Colmenero-hidalgo, E., Zahn, R., Peck, V. L., Hemming, S. R., Hall, I. R., Colmenero-hidalgo, E., Zahn, R., Peck, V. L., and Hemming, S. R.
- Abstract
In order to monitor the evolution of the British-Irish Ice Sheet (BIIS) and its influence in surface ocean structure during marine isotopic stages (MIS) 2 and 3, we have analyzed the sediments recovered in core MD04-2829CQ (Rosemary Bank, north Rockall Trough, northeast Atlantic) dated between similar to 41 and similar to 18 ka B.P. Ice-rafted debris flux and composition, Ar-40/Ar-39 ages of individual hornblende grains, multispecies planktonic stable isotope records, planktonic foraminifera assemblage data and faunal-based sea surface temperatures (SSTs) demonstrate a close interaction between BIIS dynamics and surface ocean structure and water properties in this region. The core location lies beneath the North Atlantic Current (NAC) and is ideal for monitoring the shifts in the position of its associated oceanic fronts, as recorded by faunal changes. These data reveal a succession of BIIS-sourced iceberg calving events related to low SST, usually synchronous with dramatic changes in the composition of the planktonic foraminifera assemblage and with variations in the stable isotope records of the taxa Neogloboquadrina pachyderma (sinistral coiling) and Globigerina bulloides. The pacing of the calving events, from typically Dansgaard-Oeschger millennial timescales during late MIS 3 to multicentennial cyclicity from similar to 28 ka B.P., represents the build-up of the BIIS and its growing instability toward Heinrich Event (HE) 2 and the Last Glacial Maximum. Our data confirm the strong coupling between BIIS instabilities and the temperature and salinity of surface waters in the adjacent northeast Atlantic and demonstrate the BIIS's ability to modify the NAC on its flow toward the Nordic Seas. In contrast, subsurface water masses were less affected except during the Greenland stadials that contain HEs, when most intense water column reorganizations occurred simultaneously with the deposition of cream-colored carbonate sourced from the Laurentide Ice Sheet.
- Published
- 2011
- Full Text
- View/download PDF
24. Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP
- Author
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Peck, V. L., Hall, I. R., Zahn, R., Elderfield, H., Peck, V. L., Hall, I. R., Zahn, R., and Elderfield, H.
- Abstract
We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (delta O-18) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum-North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and delta O-18 across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling.
- Published
- 2008
- Full Text
- View/download PDF
25. Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18-41 kyr ago
- Author
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Hall, I. R., primary, Colmenero-Hidalgo, E., additional, Zahn, R., additional, Peck, V. L., additional, and Hemming, S. R., additional
- Published
- 2011
- Full Text
- View/download PDF
26. Shifting ocean carbonate chemistry during the Eocene-Oligocene climate transition: Implications for deep-ocean Mg/Ca paleothermometry
- Author
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Peck, V. L., primary, Yu, J., additional, Kender, S., additional, and Riesselman, C. R., additional
- Published
- 2010
- Full Text
- View/download PDF
27. Millennial‐scale surface and subsurface paleothermometry from the northeast Atlantic, 55–8 ka BP
- Author
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Peck, V. L., primary, Hall, I. R., additional, Zahn, R., additional, and Elderfield, H., additional
- Published
- 2008
- Full Text
- View/download PDF
28. Progressive reduction in NE Atlantic intermediate water ventilation prior to Heinrich events: Response to NW European ice sheet instabilities?
- Author
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Peck, V. L., primary, Hall, I. R., additional, Zahn, R., additional, and Scourse, J. D., additional
- Published
- 2007
- Full Text
- View/download PDF
29. Effects of weight loss on the course of idiopathic intracranial hypertension in women
- Author
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Kupersmith, M. J., primary, Gamell, L., additional, Turbin, R., additional, Peck, V., additional, Spiegel, P., additional, and Wall, M., additional
- Published
- 1998
- Full Text
- View/download PDF
30. Middle Miocene oxygen minimum zone expansion offshore West Afri Evidence for global cooling precursor events.
- Author
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Kender, S., Peck, V. L., Jones, R. W., and Kaminski, M. A.
- Subjects
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OXYGEN , *SEDIMENTATION & deposition research , *CLIMATE change research , *WEATHERING , *FLOOD basalts , *VOLCANISM , *MIOCENE stratigraphic geology - Abstract
Three dissolution events ca. 16 Ma, 15.5 Ma, and 14.3 Ma ago have been identified in sediments from the Congo Fan. Multiproxy benthic foraminiferal and sedimentary records suggest an expanded oxygen minimum zone consistent with enhanced upwelling at these times. Marine carbonate records from adjacent North Africa indicate coincident episodes of increased continental weathering, suggesting that an intermittently stronger polar front strengthened west African offshore winds, increasing surface water productivity, and enhanced North African weathering during these events. We propose that Columbia River Flood Basalt volcanism, estimated to have released 106 Tg CO2 and 106 Tg SO2 between 16 and 15.6 Ma ago, may have influenced these climatic changes. [ABSTRACT FROM AUTHOR]
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- 2009
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31. Elk, Cervus elaphus, habitat use related to prescribed fire, Tuchodi River, British Columbia
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Peck, V. Ross, primary and Peek, James M., additional
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- 1991
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32. Impulsivity and strategy transfer: metamemory as mediator.
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Borkowski, John G., Peck, Virginia A., Reid, Molly K., Kurtz, Beth E., Borkowski, J G, Peck, V A, Reid, M K, and Kurtz, B E
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METACOGNITION in children ,CHILD psychology - Abstract
Acquisition, maintenance, and generalization of organizational strategies were studied as a function of impulsivity-reflectivity and metamemory. In Experiment 1, 64 second- and third-grade children, identified as impulsive or reflective, participated in strategy training and transfer sessions; 25 children in a control condition received the same tasks without strategy training. Strategy and metamemory scores were significantly higher for reflective than impulsive children. Metamemory predicted strategic behavior when cognitive tempo was removed. In Experiment 2, 80 children were given an expanded metamemory battery designed to assess verbalized knowledge of memory processes. Children in the experimental condition were trained to use an organizational strategy and later tested for its maintenance and transfer. Strategy scores were higher for the reflective children during transfer but not training, suggesting a relationship between cognitive tempo and the ability to use strategies in new contexts. Reflective children were again found to have higher metamemory scores. The correlation between metamemory and strategy use with cognitive tempo partialed out was significant, whereas the tempo-strategy use correlation was nonsignificant when metamemory was removed. Strategy maintenance and generalization in impulsive and reflective children appear mediated by metamemorial processes. [ABSTRACT FROM AUTHOR]
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- 1983
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33. Electron Microscope Study of Surface Structure
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Heidenreich, R. D., primary and Peck, V. G., additional
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- 1942
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34. Elk, Cervus elaphus, habitat use related to prescribed fire, TuchodiRiver, British Columbia
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Peek, James M. and Peck, V. Ross
- Published
- 1991
35. Inferring sites of subglacial erosion using the Pb isotopic composition of ice-rafted feldspar: Examples from the Weddell Sea, Antarctica.
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Flowerdew, M. J., Tyrrell, S., and Peck, V. L.
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- *
FELDSPAR , *SUBGLACIAL lakes , *ICE sheets , *SEDIMENTS , *EROSION - Abstract
The delivery of ice-rafted debris (IRD) from glaciated margins is a function of ice sheet dynamics. Shifts in supply and sourcing of IRD can therefore identify episodes of ice sheet instability; however, records can be difficult to correctly interpret because the subglacial geology of the catchment areas, which controls IRD composition, may be obscured. Importantly, variations can also result from shifts in erosion sites due to changes in the basal ice sheet conditions. This study evaluates where subglacial erosion has occurred in catchments that flow into the southern Weddell Sea, Antarctica, by determining the Pb isotopic compositions of individual ice-rafted feldspars from late Holocene marine sediments. Feldspar compositions match those of rock units inferred (through extrapolation of outcrop, magnetic, and gravity data) to compose areas where ice velocity, bed roughness, and shear stress are high. Significantly, signals from areas where ice velocities are high but bed roughness and shear stresses are low were not recorded, suggesting that there is reduced bedrock erosion in these regions. Major variations in IRD composition in the Weddell Sea can result from changing the loci of subglacial erosion, and do not necessarily correspond with major ice sheet instability. [ABSTRACT FROM AUTHOR]
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- 2013
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36. Efficacy and safety of a diffusion-based extended-release fluticasone propionate intra-articular injection (EP-104IAR) in knee osteoarthritis (SPRINGBOARD): a 24-week, multicentre, randomised, double-blind, vehicle-controlled, phase 2 trial.
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Malone A, Kowalski MM, Helliwell J, Lynggaard Boll S, Rovsing H, Moriat K, Castillo Mondragón A, Li Y, Prener Miller C, Reinstrup Bihlet A, Dobek C, Peck V, Wilmink M, Simon LS, and Conaghan PG
- Subjects
- Humans, Male, Female, Double-Blind Method, Middle Aged, Injections, Intra-Articular, Aged, Treatment Outcome, Delayed-Action Preparations, Pain Measurement, Czech Republic, Adult, Poland, Denmark, Osteoarthritis, Knee drug therapy, Fluticasone administration & dosage, Fluticasone pharmacokinetics, Fluticasone therapeutic use, Fluticasone adverse effects
- Abstract
Background: Corticosteroids are among the few effective treatments for knee osteoarthritis, but short duration of action limits their utility. EP-104IAR, a long-acting formulation of fluticasone propionate for intra-articular injection, optimises the action of fluticasone propionate through novel diffusion-based extended-release technology. The SPRINGBOARD trial assessed the efficacy, safety, and pharmacokinetics of EP-104IAR in people with knee osteoarthritis., Methods: SPRINGBOARD was a randomised, vehicle-controlled, double-blind, phase 2 trial done at 12 research sites in Denmark, Poland, and Czech Republic. We recruited adults aged 40 years or older with primary knee osteoarthritis (Kellgren-Lawrence grade 2-3) who reported Western Ontario and McMaster Universities Osteoarthritis Arthritis Index (WOMAC) pain scores of at least 4 and no more than 9 out of 10. Participants were randomly assigned (1:1) to receive one intra-articular dose of 25 mg EP-104IAR or vehicle control. Randomisation was done via interactive web-based access to a central predefined computer-generated list with block size of six (allocated by clinical site). Participants and assessors were masked to treatment allocation. Participants were followed up for 24 weeks. The primary outcome was the difference between groups in change in WOMAC pain score from baseline to week 12, analysed in all participants who were randomly assigned and received treatment. Safety, including laboratory analyses, and pharmacokinetics from quantification of fluticasone propionate in peripheral blood were assessed in all participants who received a dose of randomly assigned treatment. A person with lived experience of knee osteoarthritis was involved in study interpretation and writing of the report. This trial is registered with ClinicalTrials.gov, NCT04120402, and the EU Clinical Trials Register, EudraCT 2021-000859-39, and is complete., Findings: Between Sept 10, 2021, and Nov 16, 2022, 1294 people were screened for eligibility, and 319 were randomly assigned to EP-104IAR (n=164) or vehicle control (n=155). One participant in the EP-104IAR group was excluded from all analyses because treatment was not administered due to an adverse event. 318 participants (135 [42%] male and 183 [58%] female, 315 [99%] White) received randomly assigned treatment and were included in the primary analysis and safety analysis (EP-104IAR, n=163; vehicle control, n=155). At week 12, least squares mean change in WOMAC pain score from baseline was -2·89 (95% CI -3·22 to -2·56) in the EP-104IAR group and -2·23 (-2·56 to -1·89) in the vehicle control group, with a between-group difference of -0·66 (-1·11 to -0·21; p=0·0044); a significant between-group difference persisted to week 14. 106 (65%) of 163 participants in the EP-104IAR group had one or more treatment-emergent adverse event compared with 89 (57%) of 155 participants in the vehicle control group. Effects on serum glucose and cortisol concentrations were minimal and transient. There were no treatment-emergent deaths or treatment-related serious adverse events. Plasma concentrations of fluticasone propionate showed a blunted initial peak with terminal half-life of approximately 18-20 weeks., Interpretation: These phase 2 results suggest that EP-104IAR has the potential to offer clinically meaningful pain relief in knee osteoarthritis for an extended period of up to 14 weeks, longer than published data for currently marketed corticosteroids. There were minimal effects on glucose and cortisol, and stable fluticasone propionate concentrations in plasma. The safety and efficacy of EP-104IAR will be further evaluated in phase 3 trials, including the possibility of bilateral and repeat dosing with EP-104IAR., Funding: Eupraxia Pharmaceuticals., Translation: For the Danish translation of the abstract see Supplementary Materials section., Competing Interests: Declaration of interests JH, AM, MMK, CD, and VP are employees of Eupraxia Pharmaceuticals. SLB, HR, and KM are or were employees of Sanos Clinics who were contracted by Eupraxia Pharmaceuticals to perform the clinical research. ACM, YL, CPM, and ARB are employees of NBCD, a contract research organisation contracted by Eupraxia Pharmaceuticals to perform data management and trial management. PGC has performed speakers' bureaus or consultancies for AbbVie, AstraZeneca, Eli Lilly, Eupraxia, Galapagos, Genascence, GSK, Grunenthal, Janssen, Levicept, Medipost, Merck, Moebius, Novartis, Sandoz, Stryker, TrialSpark, and UCB. MW is on the Board of Directors for Eupraxia Pharmaceuticals and received royalties from NextStep Arthropedix. LSS declares no competing interests., (Copyright © 2024 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC 4.0 license. Published by Elsevier Ltd.. All rights reserved.)
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- 2024
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37. Changing the channel: a qualitative analysis of an innovative video intervention to explore resident attitudes towards interprofessional collaboration on a Geriatric Medicine Unit.
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Whitney K, Peck V, Huang AR, Park J, Menard P, MacDonald J, Spilg E, and Khoury L
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- Humans, Canada, Communication, Videotape Recording, Geriatrics, Communications Media, Attitude of Health Personnel
- Abstract
Background: Medical learners develop a more positive attitude toward Interprofessional Collaboration (IPC) following Interprofessional Education (IPE) programs. However, IPE is not standardized, and the most effective teaching tool is unclear. The purpose of our study was to develop an IPE teaching tool for medical residents during an inpatient geriatric medicine rotation at an academic hospital, evaluate and explore the impact of the program on resident attitudes towards teamwork, and identify barriers and facilitators to interprofessional collaboration., Methods: An innovative video was developed which simulated a common IPC scenario. Near the start of the rotation, learners watched the video then participated in a facilitated discussion around principles of IPE, using the Canadian Interprofessional Health Collaborative (CIHC) framework, which highlights interprofessional communication, patient-centered care, role clarification, team functioning, collaborative leadership, and interprofessional conflict resolution. At the end of their four-week rotation, focus groups were conducted to explore resident attitudes towards IPE. The Theoretical Domain Framework (TDF) was used for qualitative analysis., Results: Data from 23 participants in five focus groups were analyzed using the TDF framework. Residents were able to identify barriers and facilitators to IPC in five TDF domains: environmental context and resources, social/professional role and identity, knowledge, social influences, and skills. Their observations correlated with the CIHC framework., Conclusion: The use of a scripted video and facilitated group discussion gave insights into residents' attitudes, perceived barriers, and facilitators towards IPC on a geriatric medicine unit. Future research could explore the use of this video intervention in other hospital services where team-based care is important., Competing Interests: Each of the authors declares that no conflicts of interest exist due to financial or personal relationships which could potentially bias this work., (© 2023 Whitney, Peck, Huang, Park, Menard, MaxDonald, Spilg, Khoury; licensee Synergies Partners.)
- Published
- 2023
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38. A Case of a Pituitary Stone.
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Charles S, Agrawal N, Zan E, and Peck V
- Published
- 2021
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39. Safety and pharmacokinetics of EP-104IAR (sustained-release fluticasone propionate) in knee osteoarthritis: A randomized, double-blind, placebo-controlled phase 1 trial.
- Author
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Malone A, Price J, Price N, Peck V, Getgood A, Petrella R, and Helliwell J
- Abstract
Objective: EP-104IAR is a novel, sustained-release, intra-articular (IA) formulation of the corticosteroid fluticasone propionate (FP), in development for the treatment of osteoarthritis (OA) pain. This study evaluated the safety, pharmacokinetics (PK) and efficacy of a single dose of EP-104IAR in patients with OA of the knee., Design: This was a multi-center, randomized, double-blind, placebo-controlled trial performed at 3 sites in Canada. Subjects with moderate to severe pain received either a single dose of the investigational product EP-104IAR (15 mg) or placebo (vehicle) and were evaluated for up to 42 weeks. The primary outcome measures were safety and PK. The study was not powered to assess efficacy, however patient reported outcome measures were analyzed to evaluate pain and symptom relief., Results: Thirty-two subjects were randomized (21 women, 11 men, mean age: 64.8 years). EP-104IAR was well tolerated. Average serum cortisol levels showed no clinically significant deviations compared to placebo and remained within the normal range of cortisol variation. Plasma PK concentrations were within acceptable safety margins, compared to marketed FP products. Synovial fluid FP levels were approximately 2 orders of magnitude higher and at efficacious concentrations for most subjects. Efficacy evaluations indicated that EP-104IAR provided an immediate improvement of OA symptoms and these effects persisted for 8-12 weeks consistently across all measures., Conclusions: This study provides evidence that 15 mg of EP-104IAR is well tolerated and has the potential for efficacy in OA patients. These data support further examination of EP-104IAR in larger clinical studies., Competing Interests: AM, JP, NP, VP and JH are employees of Eupraxia Pharmaceuticals Inc. AG and RP are investigators of this study and their institutions received fees for participation. AG has received prior research grants from Eupraxia Pharmaceuticals Inc., (© 2021 The Author(s).)
- Published
- 2021
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40. Improving Communications With Patients and Families in Geriatric Care. The How, When, and What.
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Huang SC, Morgan A, Peck V, and Khoury L
- Abstract
There has been little published literature examining the unique communication challenges older adults pose for health care providers. Using an explanatory mixed-methods design, this study explored patients' and their family/caregivers' experiences communicating with health care providers on a Canadian tertiary care, inpatient Geriatric unit between March and September 2018. In part 1, the modified patient-health care provider communication scale was used and responses scored using a 5-point scale. In part 2, one-on-one telephone interviews were conducted and responses transcribed, coded, and thematically analyzed. Thirteen patients and 7 family/caregivers completed part 1. Both groups scored items pertaining to adequacy of information sharing and involvement in decision-making in the lowest 25th percentile. Two patients and 4 family/caregivers participated in telephone interviews in part 2. Interview transcript analysis resulted in key themes that fit into the "How, When, and What" framework outlining the aspects of communication most important to the participants. Patients and family/caregivers identified strategic use of written information and predischarge family meetings as potentially valuable tools to improve communication and shared decision-making., Competing Interests: Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2021.)
- Published
- 2021
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41. High-throughput determination of protein affinities using unmodified peptide libraries in nanomolar scale.
- Author
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Schulte C, Khayenko V, Nordblom NF, Tippel F, Peck V, Gupta AJ, and Maric HM
- Abstract
Protein-protein interactions (PPIs) are of fundamental importance for our understanding of physiology and pathology. PPIs involving short, linear motifs play a major role in immunological recognition, signaling, and regulation and provide attractive starting points for pharmaceutical intervention. Yet, state-of-the-art protein-peptide affinity determination approaches exhibit limited throughput and sensitivity, often resulting from ligand immobilization, labeling, or synthesis. Here, we introduce a high-throughput method for in-solution analysis of protein-peptide interactions using a phenomenon called temperature related intensity change (TRIC). We use TRIC for the identification and fine-mapping of low- and high-affinity protein interaction sites and the definition of sequence binding requirements. Validation is achieved by microarray-based studies using wild-type and mutated recombinant protein and the native protein within tissue lysates. On-chip neutralization and strong correlation with structural data establish TRIC as a quasi-label-free method to determine binding affinities of unmodified peptide libraries with large dynamic range., Competing Interests: The authors declare no competing interests., (© 2020 The Author(s).)
- Published
- 2020
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42. Myxedema Heart and Pseudotamponade.
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Baldwin C, Newman JD, Vallejo F, Peck V, Greene LW, and Goldberg IJ
- Abstract
Context: Thyroid hormone plays a critical role in cardiovascular function. Severe hypothyroidism can be associated with "myxedema heart" characterized by relative bradycardia and pericardial effusion. Effusions associated with severe hypothyroidism can be large. Despite the large volume of effusions, tamponade is not a common consequence. However, with the incorporation of echocardiography into routine practice for evaluation of effusion, echocardiographic findings suggestive of clinical tamponade occur frequently., Case Description: We report a series of 3 patients with large pericardial effusions secondary to severe hypothyroidism. These cases serve to demonstrate the discordance between echocardiographic signs consistent with tamponade with a patient's stable clinical hemodynamics. We also report the development of bronchial obstruction, a rare complication of a large effusion due to severe hypothyroidism., Conclusions: While pericardial effusion associated with severe hypothyroidism has been described for decades, the echocardiographic findings may be less well known and may lead to unnecessary downstream testing or invasive management. We use our case series to facilitate a summary of what is known about the epidemiology, mechanism and physiology, and expected outcomes of myxedema associated pericardial effusion. Finally, in the setting of current paucity of clinical guidelines, we aim to familiarize clinicians with the phenomenon of pseudotamponade and suggest management strategies for myxedema associated pericardial effusion to guide clinicians to use conservative medical management in majority of cases., (© The Author(s) 2020. Published by Oxford University Press on behalf of the Endocrine Society.)
- Published
- 2020
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43. Detection of Atypical Femur Fractures.
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Cheung AM, McKenna MJ, van de Laarschot DM, Zillikens MC, Peck V, Srighanthan J, and Lewiecki EM
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- Humans, Societies, Medical, Absorptiometry, Photon methods, Bone Density, Consensus Development Conferences as Topic, Femoral Fractures diagnosis, Femur diagnostic imaging
- Abstract
The 2019 International Society for Clinical Densitometry (ISCD) Position Development Conference Task Force for monitoring with dual-energy X-ray absorptiometry (DXA) identified detection of atypical femur fractures (AFFs) as an important topic and established this working group to answer key questions in this area. The authors conducted a systematic review of the literature and deliberated on proposed ISCD positions, which were then reviewed by an external expert panel and vetted at the 2019 ISCD Position Development Conference in Kuala Lumpur on March 23, 2019. This paper summarizes the final ISCD positions and the rationale for supporting these positions. Default-length femur imaging or extended-length femur imaging as well as full-length femur imaging (FFI), both single-energy and dual-energy scans, by DXA can detect abnormalities in the spectrum of AFF. It is important to visually inspect all DXA scans of the hip and femur, and report on findings of focal periosteal and endosteal thickening at the lateral cortex (grade: Good, A, W). FFI is the preferred DXA scan mode for detecting abnormalities in the spectrum of AFF. The FFI report should state the absence or presence of abnormalities in the spectrum of AFF. If focal thickening is present on the lateral cortex, the report should state whether a lucent line is seen (grade: Fair, C, W). The ISCD recommends considering the use of bilateral FFI in patients who are currently or have been in the past year on potent antiresorptive therapy (ie, oral or intravenous bisphosphonate or subcutaneous denosumab therapy) for a cumulative period of 3 or more years, especially those on long-term glucocorticoid therapy (grade: Fair, B, W). More research is needed to determine the role of repeat testing and the optimal time interval for follow-up DXA scans, whether an automated measuring tool would perform better than visual inspection, whether FFI would change patient management and outcomes, and the cost-effectiveness of FFI., (Copyright © 2019. Published by Elsevier Inc.)
- Published
- 2019
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44. Consistently dated Atlantic sediment cores over the last 40 thousand years.
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Waelbroeck C, Lougheed BC, Vazquez Riveiros N, Missiaen L, Pedro J, Dokken T, Hajdas I, Wacker L, Abbott P, Dumoulin JP, Thil F, Eynaud F, Rossignol L, Fersi W, Albuquerque AL, Arz H, Austin WEN, Came R, Carlson AE, Collins JA, Dennielou B, Desprat S, Dickson A, Elliot M, Farmer C, Giraudeau J, Gottschalk J, Henderiks J, Hughen K, Jung S, Knutz P, Lebreiro S, Lund DC, Lynch-Stieglitz J, Malaizé B, Marchitto T, Martínez-Méndez G, Mollenhauer G, Naughton F, Nave S, Nürnberg D, Oppo D, Peck V, Peeters FJC, Penaud A, Portilho-Ramos RDC, Repschläger J, Roberts J, Rühlemann C, Salgueiro E, Sanchez Goni MF, Schönfeld J, Scussolini P, Skinner LC, Skonieczny C, Thornalley D, Toucanne S, Rooij DV, Vidal L, Voelker AHL, Wary M, Weldeab S, and Ziegler M
- Abstract
Rapid changes in ocean circulation and climate have been observed in marine-sediment and ice cores over the last glacial period and deglaciation, highlighting the non-linear character of the climate system and underlining the possibility of rapid climate shifts in response to anthropogenic greenhouse gas forcing. To date, these rapid changes in climate and ocean circulation are still not fully explained. One obstacle hindering progress in our understanding of the interactions between past ocean circulation and climate changes is the difficulty of accurately dating marine cores. Here, we present a set of 92 marine sediment cores from the Atlantic Ocean for which we have established age-depth models that are consistent with the Greenland GICC05 ice core chronology, and computed the associated dating uncertainties, using a new deposition modeling technique. This is the first set of consistently dated marine sediment cores enabling paleoclimate scientists to evaluate leads/lags between circulation and climate changes over vast regions of the Atlantic Ocean. Moreover, this data set is of direct use in paleoclimate modeling studies.
- Published
- 2019
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45. Advance care planning after hospital discharge: qualitative analysis of facilitators and barriers from patient interviews.
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Peck V, Valiani S, Tanuseputro P, Mulpuru S, Kyeremanteng K, Fitzgibbon E, Forster A, and Kobewka D
- Subjects
- Aged, Aged, 80 and over, Attitude of Health Personnel, Female, Health Knowledge, Attitudes, Practice, Humans, Interviews as Topic, Male, Middle Aged, Patient Preference psychology, Physician-Patient Relations, Prognosis, Qualitative Research, Advance Care Planning, Patient Discharge, Quality of Life psychology, Terminally Ill psychology
- Abstract
Background: Patients who engage in Advance Care Planning (ACP) are more likely to get care consistent with their values. We sought to determine the barriers and facilitators to ACP engagement after discharge from hospital., Methods: Prior to discharge from hospital eligible patients received a standardized conversation about prognosis and ACP. Each patient was given an ACP workbook and asked to complete it over the following four weeks. We included frail elderly patients with a high risk of death admitted to general internal medicine wards at a tertiary care academic teaching hospital. Four weeks after discharge we conducted semi-structured interviews with patients. Interviews were transcribed, coded and analysed with thematic analysis. Themes were categorized according to the theoretical domains framework., Results: We performed 17 interviews. All Theoretical Domain Framework components except for Social/Professional Identity and Behavioral Regulation were identified in our data. Poor knowledge about ACP and physician communication skills were barriers partially addressed by our intervention. Some patients found it difficult to discuss ACP during an acute illness. For others acute illness made ACP discussions more relevant. Uncertainty about future health motivated some participants to engage in ACP while others found that ACP discussions prevented them from living in the moment and stripped them of hope that better days were ahead., Conclusions: For some patients acute illness resulting in admission to hospital can be an opportunity to engage in ACP conversations but for others ACP discussions are antithetical to the goals of hospital care.
- Published
- 2018
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46. Effect of a Radical Cystectomy Care Pathway on Postoperative Length of Stay and Outcomes.
- Author
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Brockman JA, Vetter J, Peck V, and Strope SA
- Subjects
- Aged, Cystectomy methods, Humans, Length of Stay statistics & numerical data, Postoperative Complications etiology, Time Factors, Urinary Tract Infections epidemiology, Urinary Tract Infections etiology, Venous Thromboembolism epidemiology, Venous Thromboembolism etiology, Cystectomy adverse effects, Patient Readmission statistics & numerical data, Perioperative Care methods, Postoperative Complications epidemiology, Urinary Bladder Neoplasms surgery
- Abstract
Objective: To determine whether an enhance recovery protocol for radical cystectomy patient affected the length of stay or the number and type of readmissions that occurred after hospital discharge., Materials and Methods: We prospectively assessed 152 cystectomy patients after initiation of the pathway. These patients were compared with the previous 147 patient operated on before the pathway initiation. Eligible patients were those undergoing radical cystectomy with any diversion at our institution. Univariate tests were performed using Wilcoxon sum-rank and chi-square tests. Multivariate analyses were performed using logistic regression models to assess for patient factors related to readmissions., Results: With institution of the pathway, length of stay decreased from 10 to 7.1 days. Our readmission rates did not change significantly. Patients were readmitted for different reasons after pathway implementation, with the rate of urinary tract infection-related readmissions increasing from 14.3% to 40.4%, but with a concomitant decrease in the rate of readmissions for wound and deep space infections from 42.9% to 23.4%. Our venous thromboembolism rate decreased from 6.8% to 3.3% with implementation of the protocol., Conclusion: Implementation of a cystectomy care pathway significantly decreased length of stay without an increased rate of readmissions at 30 days. No patient factors predisposed to an increased rate of readmission. Pathway implementation led to a decrease in wound and deep space infection readmissions, but was associated with an increase in urinary tract infection readmissions. Further studies are examining if early intervention can further decrease readmission rates., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2018
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47. Health system barriers and facilitators to medication adherence for the secondary prevention of cardiovascular disease: a systematic review.
- Author
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Banerjee A, Khandelwal S, Nambiar L, Saxena M, Peck V, Moniruzzaman M, Faria Neto JR, Quinto KC, Smyth A, Leong D, and Werba JP
- Abstract
Background: Secondary prevention is cost-effective for cardiovascular disease (CVD), but uptake is suboptimal. Understanding barriers and facilitators to adherence to secondary prevention for CVD at multiple health system levels may inform policy., Objectives: To conduct a systematic review of barriers and facilitators to adherence/persistence to secondary CVD prevention medications at health system level., Methods: Included studies reported effects of health system level factors on adherence/persistence to secondary prevention medications for CVD (coronary artery or cerebrovascular disease). Studies considered at least one of β blockers, statins, angiotensin-renin system blockers and aspirin. Relevant databases were searched from 1 January 1966 until 1 October 2015. Full texts were screened for inclusion by 2 independent reviewers., Results: Of 2246 screened articles, 25 studies were included (12 trials, 11 cohort studies, 1 cross-sectional study and 1 case-control study) with 132 140 individuals overall (smallest n=30, largest n=63 301). 3 studies included upper middle-income countries, 1 included a low middle-income country and 21 (84%) included high-income countries (9 in the USA). Studies concerned established CVD (n=4), cerebrovascular disease (n=7) and coronary heart disease (n=14). Three studies considered persistence and adherence. Quantity and quality of evidence was limited for adherence, persistence and across drug classes. Studies were concerned with governance and delivery (n=19, including 4 trials of fixed-dose combination therapy, FDC), intellectual resources (n=1), human resources (n=1) and health system financing (n=4). Full prescription coverage, reduced copayments, FDC and counselling were facilitators associated with higher adherence., Conclusions: High-quality evidence on health system barriers and facilitators to adherence to secondary prevention medications for CVD is lacking, especially for low-income settings. Full prescription coverage, reduced copayments, FDC and counselling may be effective in improving adherence and are priorities for further research.
- Published
- 2016
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48. Towards the development of multifunctional molecular indicators combining soil biogeochemical and microbiological variables to predict the ecological integrity of silvicultural practices.
- Author
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Peck V, Quiza L, Buffet JP, Khdhiri M, Durand AA, Paquette A, Thiffault N, Messier C, Beaulieu N, Guertin C, and Constant P
- Subjects
- DNA, Ribosomal chemistry, DNA, Ribosomal genetics, High-Throughput Nucleotide Sequencing, RNA, Ribosomal, 16S genetics, Sequence Analysis, DNA, Bacteria classification, Bacteria genetics, Biota, Chemical Phenomena, Soil chemistry, Soil Microbiology
- Abstract
The impact of mechanical site preparation (MSP) on soil biogeochemical structure in young larch plantations was investigated. Soil samples were collected in replicated plots comprising simple trenching, double trenching, mounding and inverting site preparation. Unlogged natural mixed forest areas were used as a reference. Analysis of soil nutrients, abundance of bacteria and gas exchanges unveiled no significant difference among the plots. However, inverting site preparation resulted in higher variations of gas exchanges when compared with trenching, mounding and unlogged natural forest. A combination of the biological and physicochemical variables was used to define a multifunctional classification of the soil samples into four distinct groups categorized as a function of their deviation from baseline ecological conditions. According to this classification model, simple trenching was the approach that represented the lowest ecological risk potential at the microsite level. No relationship was observed between MSP method and soil bacterial community structure as assessed by high-throughput sequencing of bacterial 16S rRNA gene; however, indicator genotypes were identified for each multifunctional soil class. This is the first identification of multifunctional molecular indicators for baseline and disturbed ecological conditions in soil, demonstrating the potential of applied microbial ecology to guide silvicultural practices and ecological risk assessment., (© 2016 The Authors. Microbial Biotechnology published by John Wiley & Sons Ltd and Society for Applied Microbiology.)
- Published
- 2016
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49. Healing delayed but generally reliable after bisphosphonate-associated complete femur fractures treated with IM nails.
- Author
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Egol KA, Park JH, Rosenberg ZS, Peck V, and Tejwani NC
- Subjects
- Aged, Aged, 80 and over, Bone Density Conservation Agents adverse effects, Bone Density Conservation Agents therapeutic use, Diphosphonates therapeutic use, Female, Femoral Fractures diagnostic imaging, Femoral Fractures etiology, Follow-Up Studies, Humans, Male, Middle Aged, Osteoporosis complications, Osteoporosis diagnostic imaging, Osteoporotic Fractures diagnostic imaging, Radiography, Retrospective Studies, Treatment Outcome, Bone Nails, Diphosphonates adverse effects, Femoral Fractures surgery, Fracture Fixation, Intramedullary methods, Fracture Healing drug effects, Osteoporosis drug therapy, Osteoporotic Fractures surgery
- Abstract
Background: Bisphosphonate therapy for osteoporosis has been associated with atypical femoral fractures. To date, there have been few reports in the literature regarding the preoperative and postoperative courses of patients who have sustained bisphosphonate-associated complete atypical femur fractures., Objectives/purposes: The purposes of this study were to (1) characterize the preoperative course of patients who eventually presented with bisphosphonate-associated complete atypical femur fractures (duration of bisphosphonate treatment, pain history, risk of converting a nondisplaced fracture to a complete fracture); (2) evaluate the percentage of patients who achieved radiographic union of those fractures after treatment; and (3) determine the patients' recovery of function using the Short Musculoskeletal Functional Assessment., Methods: Thirty-three patients with 41 atypical, low-energy femur fractures associated with ≥ 5 years of bisphosphonate use were treated with intramedullary nailing between 2004 and 2011 at one center. The main outcome measurements were Short Musculoskeletal Functional Assessment for function and radiographic evaluation for fracture healing. Patients had been treated with bisphosphonates for an average of 8.8 years (range, 5-20 years) before presentation., Results: Patients reported a mean of 6 months of pain before presentation (range, 1-8 months). Sixty-six percent of patients with surgically treated complete fractures became pain-free and 98% were radiographically healed by 12 months. Sixty-four percent of patients who underwent intramedullary nailing reported a functional return to baseline within 1 year. Patients who reported major functional limitations at latest followup listed pain and apprehension as the major causes of their limitation., Conclusions: Patients with surgically treated bisphosphonate-associated complete femur fractures achieved generally reliable although delayed fracture healing if malaligned, and nearly two-thirds of patients returned to self-reported baseline function within 1 year., Level of Evidence: Level III, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
- Published
- 2014
- Full Text
- View/download PDF
50. Are race and sex associated with the occurrence of atypical femoral fractures?
- Author
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Marcano A, Taormina D, Egol KA, Peck V, and Tejwani NC
- Subjects
- Black or African American statistics & numerical data, Aged, Asian statistics & numerical data, Bone Density Conservation Agents adverse effects, Chi-Square Distribution, Cross-Sectional Studies, Diphosphonates adverse effects, Female, Femoral Fractures chemically induced, Hispanic or Latino statistics & numerical data, Humans, Male, Middle Aged, Multivariate Analysis, New York City epidemiology, Odds Ratio, Osteoporosis drug therapy, Osteoporosis ethnology, Prognosis, Registries, Risk Factors, Sex Factors, White People statistics & numerical data, Femoral Fractures ethnology, Racial Groups statistics & numerical data
- Abstract
Background: Prior studies have suggested that Asian patients and women may be more likely to sustain atypical femoral fractures in association with bisphosphonate use. However, they do not account for confounders such as asymptomatic patients who are long-term bisphosphonate users or patients sustaining osteoporotic fractures., Questions/purposes: The purpose of this study was to determine the differences in sex and racial association with atypical femoral fractures by comparing demographic characteristics of patients who sustained an atypical bisphosphonate-associated fracture with patients on long-term bisphosphonates without fractures and with patients who sustained osteoporotic fractures., Methods: Three groups from prospective registries were identified: (1) patients with atypical femur fractures associated with long-term bisphosphonate use (BFF) (n = 54); (2) patients on long-term bisphosphonates but with no associated fractures (BNF) (n = 119); and (3) patients with osteoporotic proximal femur fractures not associated with bisphosphonates (PFF) (n = 216). Age, sex, and self-reported race/ethnicity were documented and compared. Multivariate and univariate analyses were done as well as age- and sex-stratified analyses., Results: Age and sex distributions of the BFF and BNF patients were similar. There was a higher percentage of Asian patients in the BFF group (17%) than in the BNF group (3%; p = 0.004) as well as Hispanics (13% versus 3% in BNF; p = 0.011). Patients in the BFF group were younger than those in the PFF group (67.5 versus 78.4 years; p < 0.001) and had fewer males (7% versus 14%; p < 0.001)., Conclusions: These data suggest that Asians are at higher risk for atypical bisphosphonate-associated fractures. We recommend closer followup in Asian patients who are taking bisphosphonates., Level of Evidence: Level III, prognostic study. See Guidelines for Authors for a complete description of levels of evidence.
- Published
- 2014
- Full Text
- View/download PDF
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