The Experts below are selected from a list of 37929 Experts worldwide ranked by ideXlab platform
C L J Frid - One of the best experts on this subject based on the ideXlab platform.
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a new fine mesh zooplankton time series from the dove Sampling Station north sea
Journal of Plankton Research, 2008Co-Authors: Sophie Pitois, Mike Shaw, Clive Fox, C L J FridAbstract:Data from the Dove North Sea time series fine-mesh (65 μm) samples are presented and made available for the first time. This time-series complements the mesozooplankton Dove dataset.
Jeanfrancois Humbert - One of the best experts on this subject based on the ideXlab platform.
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unusual cohabitation and competition between planktothrix rubescens and microcystis sp cyanobacteria in a subtropical reservoir hammam debagh located in algeria
PLOS ONE, 2017Co-Authors: Fatma Zohra Guellati, Jeanfrancois Humbert, Hassen Touati, Kevin Tambosco, Catherine Quiblier, Mourad BensouilahAbstract:Succession in bloom-forming cyanobacteria belonging to distant functional groups in freshwater ecosystems is currently an undescribed phenomenon. However in the Hammam Debagh reservoir (Algeria), P. rubescens and Microcystis sp. co-occur and sometimes proliferate. With the aim of identifying the main factors and processes involved in this unusual cohabitation, water samples were collected monthly from February 2013 to June 2015 at the subsurface at four Sampling Stations and along the entire water column at one Sampling Station. In addition, the composition of the cyanobacterial communities was estimated by Illumina sequencing of a 16S rRNA gene fragment from samples collected over one year (October 2013-November 2014). This molecular approach showed that the Hammam Debagh reservoir displays high species richness (89 species) but very low diversity due to the high dominance of Microcystis in this community. Furthermore, it appears that Planktothrix rubescens and Microcystis sp. coexisted (from September to January) but proliferated alternately (Spring 2015 for P. rubescens and Spring 2014 and Autumn 2014/2015 for Microcystis). The main factors and processes explaining these changes in bloom-forming species seem to be related to the variation in the depth of the lake during the mixing period and to the water temperatures during the winter prior to the bloom season in spring.
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impact of internal waves on the spatial distribution of planktothrix rubescens cyanobacteria in an alpine lake
The ISME Journal, 2011Co-Authors: Yannis Cuypers, Bruno Tassin, Brigitte Vinconleite, A Groleau, Jeanfrancois HumbertAbstract:The vertical and horizontal distribution of the cyanobacterium, Planktothrix rubescens, was studied in a deep alpine lake (Lac du Bourget) in a 2-year monitoring program with 11 Sampling points, and a 24-h survey at one Sampling Station. This species is known to proliferate in the metalimnic layer of numerous deep mesotrophic lakes in temperate areas, and also to produce hepatotoxins. When looking at the distribution of P. rubescens at the scale of the entire lake, we found large variations (up to 10 m) in the depth of the biomass peak in the water column. These variations were closely correlated to isotherm displacements. We also found significant variations in the distribution of the cyanobacterial biomass in the northern and southern parts of the lake. We used a physical modeling approach to demonstrate that two internal wave modes can explain these variations. Internal waves are generated by wind events, but can still be detected several days after the end of these events. Finally, our 24-h survey at one Sampling point demonstrated that the V1H1 sinusoidal motion could evolve into nonlinear fronts. All these findings show that internal waves have a major impact on the distribution of P. rubescens proliferating in the metalimnic layer of a deep lake, and that this process could influence the growth of this species by a direct impact on light availability.
Yanren Lin - One of the best experts on this subject based on the ideXlab platform.
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reducing the consumption of personal protective equipment by setting up a multifunctional Sampling Station in the emergency department to screen for covid 19 infection in taiwan
Environmental Health and Preventive Medicine, 2020Co-Authors: Po Ting Lin, Tren Yi Chen, Hsiao Fen Sun, Mu Kuan Chen, Chu Chung Chou, Po Yu Wang, Yanren LinAbstract:In Taiwan, high-risk patients have been identified and tested for preventing community spread of COVID-19. Most sample collection was performed in emergency departments (EDs). Traditional sample collection requires substantial personal protective equipment (PPE), healthcare professionals, sanitation workers, and isolation space. To solve this problem, we established a multifunctional sample collection Station (MSCS) for COVID-19 testing in front of our ED. The Station is composed of a thick and clear acrylic board (2 cm), which completely separates the patient and medical personnel. Three pairs of gloves (length, 45 cm) are attached and fixed on the outside wall of the MSCS. The gloves are used to conduct Sampling of throat/nasal swabs, sputum, and blood from patients. The gap between the board and the building is only 0.2 cm (sealed with silicone sealant). ED personnel communicate with patients using a small two-way broadcast system. Medical waste is put in specific trashcans installed in the table outside the MSCS. With full physical protection, the personnel conducting the Sampling procedure need to wear only their N95 mask and gloves. After we activated the Station, our PPE, Sampling time, and sanitization resources were considerably conserved during the 4-week observation period. The MSCS obviously saved time and PPE. It elevated the efficiency and capacity of the ED for handling potential community infections of COVID-19.
Akihide Kasai - One of the best experts on this subject based on the ideXlab platform.
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distribution of moon jellyfish aurelia aurita in relation to summer hypoxia in hiroshima bay seto inland sea
Estuarine Coastal and Shelf Science, 2010Co-Authors: Takaya Kudoh, H Takatsuji, Osamu Kawaguchi, Akihide KasaiAbstract:Biological and physical surveys were conducted in order to investigate the relationship between environmental conditions and the distribution of moon jellyfish Aurelia aurita in Hiroshima Bay, western Seto Inland Sea, Japan. Moon jellyfish and ichthyoplankton were collected at 13 Stations in Hiroshima Bay during monthly surveys from July to September in 2006 and 2007. Surface temperature in 2006 was significantly lower during the August and September cruises and surface salinity was lower during all cruises than in 2007. Moon jellyfish was the most dominant gelatinous plankton collected, accounting for 89.7% in wet weight. Mean moon jellyfish abundance in 2006 was higher than that in 2007 from July through September, with significant inter-year differences for July and September. Variability in precipitation and nutritional input from the Ohta River, northernmost part of Hiroshima Bay, were suggested as possible factors affecting the inter-annual variability in moon jellyfish abundance in the coastal areas of northern Hiroshima Bay. Moon jellyfish were more abundant in the coastal areas of northern Hiroshima Bay, where the dissolved oxygen (DO) concentration was lower, while low in the central part of the bay. Japanese anchovy Engraulis japonicus eggs were most dominant (58.1% in number) among the ichthyoplankton and were abundant in the central area of Hiroshima Bay. Explanatory analysis was conducted to detect possible effects of environmental conditions on the abundance of moon jellyfish and Japanese anchovy eggs during the summer months in Hiroshima Bay. Of the environmental conditions tested (temperature, salinity and DO of surface and bottom layers at each Sampling Station), bottom DO had the most significant effect on the moon jellyfish abundance: there was a negative correlation between the bottom DO and the moon jellyfish abundance in Hiroshima Bay during summer. 2009 Elsevier Ltd. All rights reserved.
Yannis Cuypers - One of the best experts on this subject based on the ideXlab platform.
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impact of internal waves on the spatial distribution of planktothrix rubescens cyanobacteria in an alpine lake
The ISME Journal, 2011Co-Authors: Yannis Cuypers, Bruno Tassin, Brigitte Vinconleite, A Groleau, Jeanfrancois HumbertAbstract:The vertical and horizontal distribution of the cyanobacterium, Planktothrix rubescens, was studied in a deep alpine lake (Lac du Bourget) in a 2-year monitoring program with 11 Sampling points, and a 24-h survey at one Sampling Station. This species is known to proliferate in the metalimnic layer of numerous deep mesotrophic lakes in temperate areas, and also to produce hepatotoxins. When looking at the distribution of P. rubescens at the scale of the entire lake, we found large variations (up to 10 m) in the depth of the biomass peak in the water column. These variations were closely correlated to isotherm displacements. We also found significant variations in the distribution of the cyanobacterial biomass in the northern and southern parts of the lake. We used a physical modeling approach to demonstrate that two internal wave modes can explain these variations. Internal waves are generated by wind events, but can still be detected several days after the end of these events. Finally, our 24-h survey at one Sampling point demonstrated that the V1H1 sinusoidal motion could evolve into nonlinear fronts. All these findings show that internal waves have a major impact on the distribution of P. rubescens proliferating in the metalimnic layer of a deep lake, and that this process could influence the growth of this species by a direct impact on light availability.
