Researchers at Dukes Pratt School of Engineering have developed a new way to measure microbes exposure to ultraviolet light. The tool could bolster efforts to use UV light to improve the quality and safety of tap water in the U.S.
The novel "microsphere dosimeter" technique is the first direct test of how much UV light microorganisms in fluids have been exposed to, said the researchers -- a critical step in validating the use of UV light treatment for preventing the spread of infection through drinking water. The technique was reported in the Nov. 15, 2005, issue of Environmental Science and Technology by Karl Linden and colleagues.
Lindens technique uses fluorescent microspheres, which become bleached with exposure to UV light, to mimic pathogenic microbes in water flowing through a UV reactor. By measuring the bleaching of the microspheres, the researchers can obtain precise measures of the full distribution of UV doses that a pathogen may experience -- information critical for gauging the treatments capacity to kill disease-causing bacteria or parasites before they reach the public.
Kendall Morgan | EurekAlert!
Safeguarding sustainability through forest certification mapping
27.06.2017 | International Institute for Applied Systems Analysis (IIASA)
Dune ecosystem modelling
26.06.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision
Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...
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