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Vladimir Skoda : trou blanc
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Year: 2011 Publisher: [Montpellier] : Association des Amis du Musée Fabre,

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Cyanobacteria and Cyanotoxins: New Advances and Future Challenges
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ISBN: 3039218395 3039218387 Year: 2020 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Cyanobacteria are a group of ubiquitous photosynthetic prokaryotes. Their occurrence has been increasing worldwide, due to anthropogenic activities and climate change. Several cyanobacterial species are able to synthesize a high number of bioactive molecules, among them, cyanotoxins (microcystins, cylindrospermopsin, nodularin, etc.), which are considered a health concern. For risk assessment of cyanotoxins, more scientific knowledge is required to perform adequate hazard characterization, exposure evaluation and, finally, risk characterization of these toxins. This Special Issue “Cyanobacteria and Cyanotoxins: New Advances and Future Challenges” presents new research or review articles related to different aspects of cyanobacteria and cyanotoxins, and contributes to providing new toxicological data and methods for a more realistic risk assessment.


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Optimal Surface Fitting of Point Clouds Using Local Refinement : Application to GIS Data.
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ISBN: 3031169549 3031169530 Year: 2023 Publisher: Cham : Springer International Publishing AG,

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This open access book provides insights into the novel Locally Refined B-spline (LR B-spline) surface format, which is suited for representing terrain and seabed data in a compact way. It provides an alternative to the well know raster and triangulated surface representations. An LR B-spline surface has an overall smooth behavior and allows the modeling of local details with only a limited growth in data volume. In regions where many data points belong to the same smooth area, LR B-splines allow a very lean representation of the shape by locally adapting the resolution of the spline space to the size and local shape variations of the region. The iterative method can be modified to improve the accuracy in particular domains of a point cloud. The use of statistical information criterion can help determining the optimal threshold, the number of iterations to perform as well as some parameters of the underlying mathematical functions (degree of the splines, parameter representation). The resulting surfaces are well suited for analysis and computing secondary information such as contour curves and minimum and maximum points. Also deformation analysis are potential applications of fitting point clouds with LR B-splines.


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Freshwater Algal Toxins : Monitoring and Toxicity Profile
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Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Cyanobacterial abundance has increased disproportionately, and this trend is likely to continue in the coming decades. This increase not only has deleterious effects on ecosystem biodiversity but also adversely affects drinking water supplies, livestock watering, crop yields, aquaculture, etc. Thus, the proliferation of cyanobacterial blooms presents human and animal health risks due to the common production of potent toxins, cyanotoxins. Moreover, these risks are aggravated by the accumulation potential of cyanotoxins and their transference to the food chain. In spite of the worldwide increasing occurrence of cyanotoxins, they are still underestimated in regulations. However, risk management of cyanotoxins is only possible after a thorough risk evaluation, and for that purpose, toxicity and exposure data are required. Thus, occurrence and monitoring information is of key importance, and new data in relation to the conditions that favor cyanobacterial growth and cyanotoxin production are welcome in order to prevent their appearance. On the other hand, in regard to toxicity, there are still many data gaps to fill. This book compiles 10 research papers and a review, which provide valuable contributions on all these aspects and demonstrate the importance of cyanobacteria toxins research.

Keywords

Research & information: general --- Environmental economics --- inflammatory bowel disease --- dextran sulfate sodium --- colitis --- microcystin --- colon --- HAB --- Adda --- canine intoxication --- MMPB --- urinalysis --- hair --- ELISA --- LC-MS/MS --- Microcystin-LR --- Non-alcoholic Fatty Liver Disease --- No Observed Adverse Effect Level --- Leprdb/J mice --- hepatotoxicity --- oxidative stress --- TiO2 enriched phosphopeptides --- Cyanotoxins --- microcystin congeners --- MC-LA --- nutrients --- climate --- Great Lakes --- raw water intake --- multivariate statistics --- long-term monitoring --- cyanobacteria --- microcystin-LR --- cylindrospermopsin --- cyanotoxins mixture --- plant growth --- toxin bioaccumulation --- cyanotoxin --- structure --- PP2A inhibition --- liquid chromatography --- mass spectrometry --- cyanotoxins --- metal --- zinc --- Microcystis aeruginosa --- in vivo --- genotoxicity --- micronucleus --- comet assay --- enzyme-modified comet assay --- rats --- drinking water quality --- Mozambique --- public health --- Llayta --- Nostoc --- flow cytometry --- liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) --- risk assessment --- management strategies --- modelling --- inflammatory bowel disease --- dextran sulfate sodium --- colitis --- microcystin --- colon --- HAB --- Adda --- canine intoxication --- MMPB --- urinalysis --- hair --- ELISA --- LC-MS/MS --- Microcystin-LR --- Non-alcoholic Fatty Liver Disease --- No Observed Adverse Effect Level --- Leprdb/J mice --- hepatotoxicity --- oxidative stress --- TiO2 enriched phosphopeptides --- Cyanotoxins --- microcystin congeners --- MC-LA --- nutrients --- climate --- Great Lakes --- raw water intake --- multivariate statistics --- long-term monitoring --- cyanobacteria --- microcystin-LR --- cylindrospermopsin --- cyanotoxins mixture --- plant growth --- toxin bioaccumulation --- cyanotoxin --- structure --- PP2A inhibition --- liquid chromatography --- mass spectrometry --- cyanotoxins --- metal --- zinc --- Microcystis aeruginosa --- in vivo --- genotoxicity --- micronucleus --- comet assay --- enzyme-modified comet assay --- rats --- drinking water quality --- Mozambique --- public health --- Llayta --- Nostoc --- flow cytometry --- liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) --- risk assessment --- management strategies --- modelling


Book
Freshwater Algal Toxins : Monitoring and Toxicity Profile
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Cyanobacterial abundance has increased disproportionately, and this trend is likely to continue in the coming decades. This increase not only has deleterious effects on ecosystem biodiversity but also adversely affects drinking water supplies, livestock watering, crop yields, aquaculture, etc. Thus, the proliferation of cyanobacterial blooms presents human and animal health risks due to the common production of potent toxins, cyanotoxins. Moreover, these risks are aggravated by the accumulation potential of cyanotoxins and their transference to the food chain. In spite of the worldwide increasing occurrence of cyanotoxins, they are still underestimated in regulations. However, risk management of cyanotoxins is only possible after a thorough risk evaluation, and for that purpose, toxicity and exposure data are required. Thus, occurrence and monitoring information is of key importance, and new data in relation to the conditions that favor cyanobacterial growth and cyanotoxin production are welcome in order to prevent their appearance. On the other hand, in regard to toxicity, there are still many data gaps to fill. This book compiles 10 research papers and a review, which provide valuable contributions on all these aspects and demonstrate the importance of cyanobacteria toxins research.


Book
Comment comprendre la "crise" de l'Etat postcolonial en Afrique ? : Un essai d'explication structurelle à partir des cas de l'Angola, du Congo-Brazzaville, du Congo-Kinshasa, du Liberia et du Rwanda
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ISBN: 3039106899 Year: 2005 Volume: 515 = European university stud Publisher: Bern Peter Lang


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Advanced Photocatalytic Materials
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Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Semiconductor photocatalysts have attracted a great amount of multidiscipline research due to their high potential for solar-to-chemical-energy conversion applications, ranging from water and air purification to hydrogen and chemical fuel production. This unique diversity of photoinduced applications has spurred major research efforts on the rational design and development of photocatalytic materials with tailored structural, morphological, and optoelectronic properties in order to promote solar-light harvesting, easy photogenerated electron-hole recombination and the concomitant low quantum efficiency. This book presents a collection of original research articles on advanced photocatalytic materials, synthesized by novel fabrication approaches and/or innovative modifications that improve their performance in target photocatalytic applications such as water (cyanobacterial toxins, antibiotics, phenols, and dyes) and air (NOx and volatile organic compounds) pollutant degradation, hydrogen evolution, and hydrogen peroxide production by photoelectrochemical cells.

Keywords

Technology: general issues --- anatase --- brookite --- C/N-TiO2 --- microcystin-LR --- photodegradation --- visible light --- TiO2 nanomaterials --- Au nanoparticles --- anodization --- photocatalytic degradation of antibiotics --- LC-MS/MS --- TiO2 --- photonic crystals --- graphene oxide nanocolloids --- reduced graphene oxide --- photocatalysis --- photocatalytic materials --- nanocomposites --- sulfate-modified BiVO4 --- methylene blue --- LED visible light --- photodecomposition --- anatase TiO2 nanocrystals --- high-energy facets --- photocatalytic activity --- photovoltaic performance --- photoactive cement --- TiO2/N --- NOx decomposition --- mechanical properties --- plasmonic photocatalysis --- silver-copper oxide --- VOCs remediation --- full-spectrum photoresponse --- carbon-doped titania --- carbon-modified titania --- graphene/titania --- vis-active photocatalyst --- antibacterial properties --- laser pyrolysis --- hydrogen peroxide --- CdS --- CdSe --- photoelectrocatalysis --- photocatalytic fuel cells --- photo fuel cells --- visible light activated titania --- heterojunction photocatalysts --- photonic crystal catalysts --- graphene-based photocatalysts --- water and air purification --- solar fuels --- anatase --- brookite --- C/N-TiO2 --- microcystin-LR --- photodegradation --- visible light --- TiO2 nanomaterials --- Au nanoparticles --- anodization --- photocatalytic degradation of antibiotics --- LC-MS/MS --- TiO2 --- photonic crystals --- graphene oxide nanocolloids --- reduced graphene oxide --- photocatalysis --- photocatalytic materials --- nanocomposites --- sulfate-modified BiVO4 --- methylene blue --- LED visible light --- photodecomposition --- anatase TiO2 nanocrystals --- high-energy facets --- photocatalytic activity --- photovoltaic performance --- photoactive cement --- TiO2/N --- NOx decomposition --- mechanical properties --- plasmonic photocatalysis --- silver-copper oxide --- VOCs remediation --- full-spectrum photoresponse --- carbon-doped titania --- carbon-modified titania --- graphene/titania --- vis-active photocatalyst --- antibacterial properties --- laser pyrolysis --- hydrogen peroxide --- CdS --- CdSe --- photoelectrocatalysis --- photocatalytic fuel cells --- photo fuel cells --- visible light activated titania --- heterojunction photocatalysts --- photonic crystal catalysts --- graphene-based photocatalysts --- water and air purification --- solar fuels


Book
Artificial Intelligence for Smart and Sustainable Energy Systems and Applications
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ISBN: 3039288903 303928889X Year: 2020 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Energy has been a crucial element for human beings and sustainable development. The issues of global warming and non-green energy have yet to be resolved. This book is a collection of twelve articles that provide strong evidence for the success of artificial intelligence deployment in energy research, particularly research devoted to non-intrusive load monitoring, network, and grid, as well as other emerging topics. The presented artificial intelligence algorithms may provide insight into how to apply similar approaches, subject to fine-tuning and customization, to other unexplored energy research. The ultimate goal is to fully apply artificial intelligence to the energy sector. This book may serve as a guide for professionals, researchers, and data scientists—namely, how to share opinions and exchange ideas so as to facilitate a better fusion of energy, academic, and industry research, and improve in the quality of people's daily life activities.


Book
Advanced Photocatalytic Materials
Author:
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Semiconductor photocatalysts have attracted a great amount of multidiscipline research due to their high potential for solar-to-chemical-energy conversion applications, ranging from water and air purification to hydrogen and chemical fuel production. This unique diversity of photoinduced applications has spurred major research efforts on the rational design and development of photocatalytic materials with tailored structural, morphological, and optoelectronic properties in order to promote solar-light harvesting, easy photogenerated electron-hole recombination and the concomitant low quantum efficiency. This book presents a collection of original research articles on advanced photocatalytic materials, synthesized by novel fabrication approaches and/or innovative modifications that improve their performance in target photocatalytic applications such as water (cyanobacterial toxins, antibiotics, phenols, and dyes) and air (NOx and volatile organic compounds) pollutant degradation, hydrogen evolution, and hydrogen peroxide production by photoelectrochemical cells.


Book
Advancing Knowledge on Cyanobacterial Blooms in Freshwaters
Authors: ---
Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Cyanobacterial blooms are a water quality problem that is widely acknowledged to have detrimental ecological and economic effects in drinking and recreational water supplies and fisheries. There is increasing evidence that cyanobacterial blooms have increased globally and are likely to expand in water resources as a result of climate change. Of most concern are cyanotoxins, along with the mechanisms that induce their release and determine their fate in the aquatic environment. These secondary metabolites pose a potential hazard to human health and agricultural and aquaculture products that are intended for animal and human consumption; therefore, strict and reliable control of cyanotoxins is crucial for assessing risk. In this direction, a deeper understanding of the mechanisms that determine cyanobacterial bloom structure and toxin production has become the target of management practices. This Special Issue, entitled “Advancing Knowledge on Cyanobacterial Blooms in Freshwaters”, aims to bring together recent multi- and interdisciplinary research, from the field to the laboratory and back again, driven by working hypotheses based on any aspect of mitigating cyanobacterial blooms, from ecological theory to applied research.

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