Showing results for: bacteria testing Articles
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Defining Pore Size Through Bubble Point Test
Pore size rating is among the key selection criteria for membrane filters as it indicates the extent of particle size (including microorganisms) that can effectively be retained in a filtration application. With its importance, manufacturers are compelled to provide pore size ratings as accurately as possible. For such purpose, bacterial and particle challenge testing methods are used to ...
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Toxicity Assessment of Chemicals using Conventional Acute Daphnia magna Tests, Toxkits and Fluotox Microbiotests
Abstract : Simple, rapid and cost-effective testing procedures were developed over the last few years, mainly for application in routine toxicity screening. One of the most significant breakthroughs in this regard are the highly standardized Toxkit microbiotests, which make use of dormant or immobilized stages of selected invertebrate species as the biological material from which the test species ...
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Well water quality in rural Nicaragua using a low-cost bacterial test and microbial source tracking
Water-related diseases, particularly diarrhea, are major contributors to morbidity and mortality in developing countries. Monitoring water quality on a global scale is crucial to making progress in terms of population health. Traditional analytical methods are difficult to use in many regions of the world in low-resource settings that face severe water quality issues due to the ...
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Effect of different growth parameters on endoglucanase enzyme activity by bacteria isolated from coir retting effluents of estuarine environment
Abstract: The cellulolytic enzyme-endoglucanase activity against coir fibre, a major biowaste by bacteria such as Cellulomonas, Bacillus and Micrococcus spp. isolated from coir retting effluents of estuarine environment was studied. The enzyme assay was carried out by using various concentrations (0.5 – 2%) of substrate of coir powder as a carbohydrate in different pH (5 – 9) and temperature (20 ...
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Toxicity Monitoring of the Scheldt and Meuse Rivers in Wallonia (Belgium) by Conventional Tests and Microbiotests
Abstract : The Microtox acute toxicity test using the luminescent bacterium Vibrio fischeri, was chosen as a complementary descriptive parameter of toxic pollution in the framework of monitoring surface water quality in Wallonia, Belgium. In order to examine the samples on a routine basis, ensure a cost-effective approach adapted to the dilution effects, and enhance the sensitivity of the system, ...
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The potential of lipopolysaccharide as a real-time biomarker of bacterial contamination in marine bathing water
The use of total lipopolysaccharide (LPS) as a rapid biomarker for bacterial pollution was investigated at a bathing and surfing beach during the UK bathing season. The levels of faecal indicator bacteria Escherichia coli (E. coli), the Gram-positive enterococci, and organisms commonly associated with faecal material, such as total coliforms and Bacteroides, were culturally monitored over four ...
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Neptune project deliverable D3.1
Ecotoxicity and microbiological testing methods (OECD and DIN/ISO guidelines) optimised for whole effluent testing Within Workpackage 3 the following tests will be performed: Whole effluent testing (WET) and Toxicity Identification Evaluation (TIE) in fractionated samples for up to 200 samples with tier 1 screening assays: YES (Yeast Estrogenic Screen) and YAS (Yeast Androgenic Screen) for ...
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Tea tree oil–containing chitosan/polycaprolactone electrospun nonwoven mats: a systematic study of its anti–bacterial properties in vitro
This study demonstrates a facile and general method developed to prepare a free–standing chitosan/polycaprolactone nonwoven mat (CS/PCLNM) using an electrospinning system equipped with a metallic frame with an air gap. All nonwoven mats are composed of polycaprolactone microfibres coated with a layer of CS or tea tree oil containing–CS (TTO–CS/PCLNM). Four bacteria commonly associated with human ...
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Alternative Assays for Routine Toxicity Assessments : a Review
Abstract : The number of available aquatic toxicity tests is large and increases every year. For certain types of applications such as the routine screening of large numbers of environmental samples, standard conventional tests may be perceived as being unpractical. This has lead to the development of a (increasing) number of alternative small-scale toxicity tests also called microbiotests. The ...
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Top 10 questions you should ask when purchasing a control valve
Automatic control valves, much like everything else we purchase these days, are not all created equal. Some fall into the high quality bracket with pricing to match, while others hover closer to the lower quality and price sensitive end of the scale. Unfortunately, when evaluating control valve prices, it is not always clear what you are being offered and what standards the valve actually meets. ...
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Estimation of the Hazard of Landfills through Toxicity Testing of Leachates
Abstract : Twenty-seven landfill leachates were tested on a battery of conventional toxicity tests (microalgae, daphnids, duckweeds) and new microbiotests (rotifers, crustaceans, protozoans, luminescent bacteria).The toxicity varied substantially from one test species to the other, from one site to the other, as well as from one type of landfill to the other. Leachates of domestic wastes were ...
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A novel electrospun polyurethane nanofibre membrane – production parameters and suitability for wastewater (WW) treatment
The aim of this study was to investigate the suitability of a novel electrospun polyurethane nanofibre material for water-treatment purposes. Bacterial removal efficiency was tested in the laboratory by filtering artificial water spiked with Escherichia coli through a 0.25 µm nanofibre membrane. The results were compared with those obtained using a commercial microfiltration material ...
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Short- and long-term orange dye effects on ammonium oxidizing and anammox bacteria activities
The effects of orange azo dye over ammonia oxidizing bacteria (AOB) and anammox bacteria activities were tested. Performed batch tests indicated that concentrations lower than 650 mgorange/L stimulated AOB activity, while anammox bacteria activity was inhibited at concentrations higher than 25 mgorange/L. Long-term performance of a continuous stirred tank reactor (CSTR) for the partial ...
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Denitrification of drinking water using
Saccharum spontaneum L. as a natural organic solid substrateThere is a global concern regarding the increasing pollution of natural water bodies by nitrate as a result of anthropogenic activities. To address this situation, natural organic solid substrates (NOSS) have been investigated as carbon sources in denitrification. Despite advances in this field, a lack of knowledge about the kinetics involved in the denitrification processes using NOSS still ...
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Test organisms behaviour on municipal and industrial wastewater quality assessment
Industrial wastewaters quality became a target for the environmental toxicity assessment nowadays. When there are issues with complex effluents for which many chemicals cannot be quantified and/or interactive effects are likely to be significant, the use of bioassays with different test species becomes a more reliable way in the assessment of toxicity. Ecotoxicity evaluation of the several ...
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Biodegradation of total petroleum hydrocarbon (TPH) in Jordanian petroleum sludge
Bioremediation, or the use of micro-organisms to decontaminate soil or groundwater, is being increasingly seen as an effective, environment-friendly treatment for oil-contaminated sites. In this study, the results are presented concerning a laboratory screening of several natural bacterial consortia and laboratory tests to establish the performance in degradation of hydrocarbons contained in oily ...
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QUALITY AND PROCESS ASSURANCE OF CLEAN ROOM CONCEPTS
Due to these facts, PET packaging and their production and packaging with so called clean room concepts have become more and more significant. A major advantage of the clean room technology compared to other methods for the reduction of germs of added air is that the clean room technology is defined by clean room classes. A maximum concentration of particles respectively germs, also called colony ...
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HOW TO PROPERLY COMPARE ATP TESTING AND CULTURE?
ATP testing and bacterial culture on solid agar plates are two completely different techniques. While culture method only measures culturable bacteria, i.e., the ones able to grow on a given media, ATP testing measures the quantity of ATP in a sample. As this molecule is produced and found in all living bacteria, ATP testing measures all the bacteria, culturable or not. This ...
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A systematic approach for the assessment of bacterial growth-controlling factors linked to biological stability of drinking water in distribution systems
A systematic approach is presented for the assessment of (i) bacterial growth-controlling factors in drinking water and (ii) the impact of distribution conditions on the extent of bacterial growth in full-scale distribution systems. The approach combines (i) quantification of changes in autochthonous bacterial cell concentrations in full-scale distribution systems with (ii) laboratory-scale ...
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Toxicity Determination of the Sediments of the River Seine in France by Application of a Battery of Microbiotests
Abstract : This study reports on the potential of the Toxkit microbiotests and the bacterial luminescence test Microtox®, to detect and quantify the toxicity of the sediments of the river Seine and a few tributary rivers in France. The objective of the research was to try to identify a minimum test battery for routine toxicity screening of river sediments. Attempts were also made to correlate ...
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