Water Quality, Cyanobacteria, and Environmental Factors and Their Relations to Microcystin Concentrations for Use in Predictive Models at Ohio Lake Erie and Inland Lake Recreational Sites, 2013-14 PDF Download
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Author: Donna S. Francy
Publisher:
ISBN:
Category : Recreation areas
Languages : en
Pages : 0
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Book Description
Author: Donna S. Francy
Publisher:
ISBN:
Category : Recreation areas
Languages : en
Pages : 0
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Author: Traven Aldin Wood
Publisher:
ISBN:
Category : Cyanobacteria
Languages : en
Pages : 151
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Book Description
Cyanobacteria present significant public health and engineering challenges due to their expansive growth and potential synthesis of microcystins in surface waters that are used as a drinking water source. Eutrophication of surface waters coupled with favorable climatic conditions can create ideal growth environments for these organisms to develop what is known as a cyanobacterial harmful algal bloom (cHAB). Development of methods to predict the presence and impact of microcystins in drinking water treatment systems is a complex process due to system uncertainties. This research developed two predictive models, first to estimate microcystin concentrations at a water treatment intake, second, to estimate the risks of finished water detections after treatment and resultant health effects to consumers. The first model uses qPCR data to adjust phycocyanin measurements to improve predictive linear regression relationships. Cyanobacterial 16S rRNA and mcy genes provide a quantitative means of measuring and detecting potentially toxic genera/speciess of a cHAB. Phycocyanin is a preferred predictive tool because it can be measured in real-time, but the drawback is that it cannot distinguish between toxic genera/speciess of a bloom. Therefore, it was hypothesized that genus specific ratios using qPCR data could be used to adjust phycocyanin measurements, making them more specific to the proportion of the bloom that is producing toxin. Data was obtained from a water treatment plant (WTP) intake at Tappan Lake, Ohio, a drinking water source for the Village of Cadiz. Using Pearson correlations and linear regressive analysis, it was found that adjusted phycocyanin, based on Planktothrix 16S and Planktothrix mcyE gene abundance ratios, exhibits improved correlation with microcystins. Furthermore, the analysis demonstrated the practicality of the adjustment in turning negative correlations between phycocyanin and microcystins to positive. More data from other water systems are needed to validate the findings of this study. The second model utilizes a stochastic method to model the risk of microcystin finished water detections after water treatment. Data needed for such a model include initial and finished water toxin detections, removal efficiencies of various treatment processes, and exposure data related to a consumer. Three different methods for modelling the health status of a bloom in order to determine the intra- to extracellular (E/I) ratio of initial toxin concentrations were explored. Then, water treatment characteristics specific to the 2014 Toledo Water Crisis (TWC) were modeled to obtain estimated finished water detections. Finally, health risks were estimated using a hazard quotient based on finished water detections and exposure scenarios. Risk estimates for children were greater than adults and present throughout the crisis. This model produced accurate predictive outputs that are consistent with conditions observed during the 2014 TWC. Furthermore, this model presents a novel method of assigning E/I ratios to initial microcystin concentrations, which is useful for assessing and predicting WTP resiliency amidst a changing bloom. Together, these models can serve as an innovative way of predicting microcystins from intake to tap.
Author: Mariyo F. Watanabe
Publisher: CRC Press
ISBN: 9780849376931
Category : Science
Languages : en
Pages : 284
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Book Description
This book discusses toxic Microcystis and the toxins from various viewpoints such as classification, cultivation, occurrences in lakes, and relations to zooplankton. The text presents new information on the chemistry, analytical chemistry, toxicology, molecular modeling, and liver tumor promotion of the toxins. Microcystis species are described in relation to morphological features, allozyme genotype, and toxin content. Seasonal changes of Microcystis population are described with special references to toxic species and composition of the toxins. Chemical characteristics of microcystins are reviewed and the process for identification of microcystins is described.
Author: H. Kenneth Hudnell
Publisher: Springer Science & Business Media
ISBN: 0387758658
Category : Medical
Languages : en
Pages : 955
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Book Description
With the ever-increasing incidence of harmful cyanobacterial algal blooms, this monograph has added urgency and will be essential reading for all sorts of researchers, from neuroscientists to cancer research specialists. The volume contains the proceedings of the 2005 International Symposium on Cyanobacterial Harmful Algal Blooms, and has been edited by H. Kenneth Hudnell, of the US Environmental Protection Agency. It contains much of the most recent research into the subject.
Author: Ingrid Chorus
Publisher: CRC Press
ISBN: 1000262049
Category : Technology & Engineering
Languages : en
Pages : 701
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Book Description
Cyanobacterial toxins are among the hazardous substances most widely found in water. They occur naturally, but concentrations hazardous to human health are usually due to human activity. Therefore, to protect human health, managing lakes, reservoirs and rivers to prevent cyanobacterial blooms is critical. This second edition of Toxic Cyanobacteria in Water presents the current state of knowledge on the occurrence of cyanobacteria and cyanotoxins as well as their impacts on health through water-related exposure pathways, chiefly drinking-water and recreational activity. It provides scientific and technical background information to support hazard identification, assessment and prioritisation of the risks posed by cyanotoxins, and it outlines approaches for their management at each step of the water-use system. It sets out key practical considerations for developing management strategies, implementing efficient measures and designing monitoring programmes. This enables stakeholders to evaluate whether there is a health risk from toxic cyanobacteria and to mitigate it with appropriate measures. This book is intended for those working on toxic cyanobacteria with a specific focus on public health protection. It intends to empower professionals from different disciplines to communicate and cooperate for sustainable management of toxic cyanobacteria, including public health workers, ecologists, academics, and catchment and waterbody managers. Ingrid Chorus headed the department for Drinking-Water and Swimming-Pool Hygiene at the German Environment Agency. Martin Welker is a limnologist and microbiologist, currently with bioMérieux in Lyon, France.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309679702
Category : Science
Languages : en
Pages : 423
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Book Description
New York City's municipal water supply system provides about 1 billion gallons of drinking water a day to over 8.5 million people in New York City and about 1 million people living in nearby Westchester, Putnam, Ulster, and Orange counties. The combined water supply system includes 19 reservoirs and three controlled lakes with a total storage capacity of approximately 580 billion gallons. The city's Watershed Protection Program is intended to maintain and enhance the high quality of these surface water sources. Review of the New York City Watershed Protection Program assesses the efficacy and future of New York City's watershed management activities. The report identifies program areas that may require future change or action, including continued efforts to address turbidity and responding to changes in reservoir water quality as a result of climate change.
Author: David Michael Wituszynski
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
Lake Erie is an important economic and cultural resource that is threatened by recurring blooms of cyanobacteria which produce toxins such as microcystin (MC). This potent liver toxin, which has been linked to human and animal illness and death, has been found in fish from Lake Erie, sometimes in excess of World Health Organization guidelines for safe consumption. Even so, few studies have examined the variation of MC concentrations in fish within Lake Erie, and these past studies have derived conflicting results as to the risk these concentrations pose to public health. This uncertainty likely exists because of the extremely variable nature of the algae blooms from year to year, and because of the different species on which each study has focused.
Author: US Global Change Research Program
Publisher: Simon and Schuster
ISBN: 1510726217
Category : Science
Languages : en
Pages : 592
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Book Description
As global climate change proliferates, so too do the health risks associated with the changing world around us. Called for in the President’s Climate Action Plan and put together by experts from eight different Federal agencies, The Impacts of Climate Change on Human Health: A Scientific Assessment is a comprehensive report on these evolving health risks, including: Temperature-related death and illness Air quality deterioration Impacts of extreme events on human health Vector-borne diseases Climate impacts on water-related Illness Food safety, nutrition, and distribution Mental health and well-being This report summarizes scientific data in a concise and accessible fashion for the general public, providing executive summaries, key takeaways, and full-color diagrams and charts. Learn what health risks face you and your family as a result of global climate change and start preparing now with The Impacts of Climate Change on Human Health.
Author: Donna S. Francy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Charles J Patton
Publisher: CreateSpace
ISBN: 9781500223311
Category : Technology & Engineering
Languages : en
Pages : 44
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Book Description
This report documents work at the U.S. Geological Sur- vey (USGS) National Water Quality Laboratory (NWQL) to validate enzymatic reduction, colorimetric determinative meth- ods for nitrate + nitrite in filtered water by automated discrete analysis. In these standard- and low-level methods (USGS I-2547-11 and I-2548-11), nitrate is reduced to nitrite with nontoxic, soluble nitrate reductase rather than toxic, granular, copperized cadmium used in the longstanding USGS auto- mated continuous-flow analyzer methods I-2545-90 (NWQL laboratory code 1975) and I-2546-91 (NWQL laboratory code 1979). Colorimetric reagents used to determine resulting nitrite in aforementioned enzymatic- and cadmium-reduction meth- ods are identical. The enzyme used in these discrete analyzer methods, designated AtNaR2 by its manufacturer, is produced by recombinant expression of the nitrate reductase gene from wall cress (Arabidopsis thaliana) in the yeast Pichia pastoris. Unlike other commercially available nitrate reductases we evaluated, AtNaR2 maintains high activity at 37°C and is not inhibited by high-phenolic-content humic acids at reaction temperatures in the range of 20°C to 37°C. These previously unrecognized AtNaR2 characteristics are essential for success- ful performance of discrete analyzer nitrate + nitrite assays (henceforth, DA-AtNaR2) described here.
