The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Gábor Vasas - One of the best experts on this subject based on the ideXlab platform.
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Laboratory and microcosm experiments testing the toxicity of chlorinated hydrocarbons on a cyanobacterium strain (Synechococcus PCC 6301) and on natural phytoplankton assemblages
Hydrobiologia, 2013Co-Authors: István Bácsi, Tamás Török, Viktória B-béres, Péter Török, Béla Tóthmérész, Alex Sándor Nagy, Gábor VasasAbstract:In the last few years, halogenated hydrocarbons have been detected in the soil, in the aquatic environment, in organisms, and even in drinking water. The toxic effects of three chlorinated aliphatic hydrocarbons (trichloroethylene, Tetrachloroethylene and tetrachloroethane) were studied in laboratory experiments (using the cyanobacterium Synecococcus elongatus PCC 6301 as test organism) and in field-like circumstances (natural phytoplankton assemblages enclosed in microcosms). The results of the laboratory experiments showed that all of the tested compounds significantly inhibited the growth of the cultures within the first 4 h. Enzymatic changes of the treated cultures suggested that oxidative stress occured—all of the three compounds caused an increase in the activity of peroxidases and superoxide dismutase, and also increased the levels of lipid peroxidation. Observed changes in microcosms were comparable with the results of the laboratory experiments: the number of individuals and chlorophyll contents decreased in the treated assemblages. The elevated levels of peroxidation on the second day in the assemblages treated with tetrachloroethane and tetrachloroetylene suggest that oxidative stress could occur in field conditions. One of the most important findings is the decrease in species number. Our results showed that cryptomonads, some green algae species and the cyanobacterium Limnothrix gradually disappeared from the treated beakers during the experiment.
M. V. Prabhakara Rao - One of the best experts on this subject based on the ideXlab platform.
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Excess enthalpies of 2-alkoxyethanols with trichloroethylene and Tetrachloroethylene at 298.15 K
Thermochimica Acta, 1994Co-Authors: D. Venkatesulu, M. V. Prabhakara Rao, D. VeerannaAbstract:Abstract Excess enthalpies HE for binary mixtures of tricholorethylene and Tetrachloroethylene with 2-alkoxyethanols at 298.15 K have been measured over the entire range of composition with Parr's 1451 solution calorimeter. The alkoxyethanols were 2-methoxyethanol, 2-ethoxyethanol and 2-butoxyethanol. The HE values are positive for the systems Tetrachloroethylene + 2-alkoxyethanols, and a change in sign from negative to positive is observed for the systems trichloroethylene + 2-alkoxyethanols. The measured excess enthalpies decrease as the chain length of the alkoxyethanol increases.
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Excess volumes of 2-alkoxyethanols with trichloroethylene and Tetrachloroethylene
Journal of Chemical & Engineering Data, 1992Co-Authors: D. Venkatesulu, M. V. Prabhakara RaoAbstract:Excess volumes of binary liquid mixtures of trichloroethylene and Tetrachloroethylene with 2-methoxyethanol, 2-ethoxyethanol, and 2-butoxyethanol have been measured at 909.15 and 919.15 K with a dilatometer. Excess volumes are positive over the entire range of composition for the systems trichloroethylene+2-methoxyethanol and Tetrachloroethylene+2-methoxyethanol,+2-ethoxyethanol, and+2-butoxyethanol and change sign from negative to positive for the remaining two systems, trichloroethylene+2-ethoxyethanol and+2-butoryethanol
Ann Aschengrau - One of the best experts on this subject based on the ideXlab platform.
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modeled exposure to Tetrachloroethylene contaminated drinking water and the occurrence of birth defects a case control study from massachusetts and rhode island
Environmental Health, 2018Co-Authors: Ann Aschengrau, Lisa G Gallagher, Michael Winter, Lindsey J Butler, Patricia M Fabian, Veronica M VieiraAbstract:Background Residents of Massachusetts and Rhode Island were exposed to Tetrachloroethylene-contaminated drinking water from 1968 through the early 1990s when it leached from the vinyl lining of asbestos cement water distribution pipes. While occupational exposure to solvents during pregnancy has consistently been linked to an increased risk of certain birth defects, mixed results have been observed for environmental sources of exposure, including contaminated drinking water. The present case-control study was undertaken to examine further the association between prenatal exposure to Tetrachloroethylene-contaminated drinking water and the risk of central nervous system defects, oral clefts and hypospadias.
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Cancer Risk and Tetrachloroethylene-contaminated Drinking Water in Massachusetts
Archives of environmental health, 1993Co-Authors: Ann Aschengrau, David Ozonoff, Christopher Paulu, Patricia F. Coogan, Richard M. Vezina, Timothy Heeren, Yuqing ZhangAbstract:A population-based case-control study was used to evaluate the relationship between cases of bladder cancer (n = 61), kidney cancer (n = 35), and leukemia (n = 34) and exposure to Tetrachloroethylene from public drinking water. Subjects were exposed to Tetrachloroethylene when it leached from the plastic lining of drinking water distribution pipes. Relative delivered dose of Tetrachloroethylene was estimated, using an algorithm that accounted for (1) residential history and duration, (2) whether lined pipe served the neighborhood, (3) distribution system flow characteristics, and (4) pipe age and dimensions. Whether or not latency was considered, an elevated relative risk of leukemia was observed among ever exposed subjects (adjusted OR = 1.96, 95% CI = 0.71-5.37, with latency; adjusted OR = 2.13, 95% CI = 0.88-5.19, without latency) that increased further among subjects whose exposure level was over the 90th percentile (adjusted OR = 5.84, 95% CI = 1.37-24.91, with latency; adjusted OR = 8.33, 95% CI = 1.53-45.29, without latency). When latency was ignored, there was also an increased relative risk of bladder cancer among subjects whose exposure level was over the 90th percentile (adjusted OR = 4.03, 95% CI = 0.65-25.10). Given that Tetrachloroethylene is a common environmental and workplace contaminant in the United States, its carcinogenic potential is a matter of public health concern.
Gilbert Pépin - One of the best experts on this subject based on the ideXlab platform.
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Tetrachloroethylene fatality: case report and simple gas chromatographic determination in blood and tissues
Forensic science international, 1995Co-Authors: Yvan Gaillard, Francis Billault, Gilbert PépinAbstract:We have described a simple, precise and sensitive assay of Tetrachloroethylene in whole blood and tissues, suitable both for emergency cases and forensic medicine. The method employs gas chromatography and electron capture detection. The case report concerns a fatal exposure of a child to Tetrachloroethylene. Concentrations of the chemical in different fluids and tissues were determined and compared to two other previously published fatalities.
Paul Marshall - One of the best experts on this subject based on the ideXlab platform.
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Kinetic studies of the reaction of hydroxyl radicals with trichloroethylene and Tetrachloroethylene
Chemosphere, 2001Co-Authors: Leann B. Tichenor, Abdulaziz El-sinawi, Takahiro Yamada, Philip H. Taylor, Jingping Peng, Paul MarshallAbstract:Article on kinetic studies of the reaction of hydroxyl radicals with trichloroethylene and Tetrachloroethylene.
