The Experts below are selected from a list of 2814 Experts worldwide ranked by ideXlab platform
Saburo Matsui - One of the best experts on this subject based on the ideXlab platform.
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sorption of polycyclic aromatic hydrocarbons into Liposomes Artificial cell membranes and the effects of dissolved natural organic matter
2002Co-Authors: Yoshihisa Shimizu, Junichi Takahashi, Jun Matsubara, Kazuhiro Ikeda, Saburo MatsuiAbstract:Dissolved natural organic matter (NOM) occurs widely in the aquatic environment and affects the fate of microorganic pollutants (e.g. intake, accumulation, movement, degradation, toxicity). The effect of NOM on the intake into biota (living cells) is very important. In the present study, the effects of coexisting NOM on the intake of microorganic pollutants into aquatic biota were experimentally evaluated. The NOM was concentrated from Lake Biwa water using a reverse osmosis filtration membrane. Two polycyclic aromatic hydrocarbons (PAH; pyrene and phenanthrene) were used as representative microorganic pollutants. Liposomes were synthesized in the laboratory to simulate living cell membranes and were used to investigate the intake of microorganic pollutants into aquatic biota. The experimental results (PAH onto NOM, NOM into Liposomes, and PAH into Liposomes) indicated that the sorption of PAH into Liposomes was suppressed, apparently by PAH binding with NOM in the aqueous phase. This suggests that the accumulation and/or toxicity of microorganic pollutants can be retarded by NOM in the aqueous environment. Moreover, the experimental results indicated that sorption into Liposomes (the liposome/water sorption coefficient, Klipw) could be a better parameter for estimating the intake of microorganic pollutants into aquatic biota than the n-octanol/water partition coefficient (Kow) in the aqueous environment.
Yoshihisa Shimizu - One of the best experts on this subject based on the ideXlab platform.
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sorption of polycyclic aromatic hydrocarbons into Liposomes Artificial cell membranes and the effects of dissolved natural organic matter
2002Co-Authors: Yoshihisa Shimizu, Junichi Takahashi, Jun Matsubara, Kazuhiro Ikeda, Saburo MatsuiAbstract:Dissolved natural organic matter (NOM) occurs widely in the aquatic environment and affects the fate of microorganic pollutants (e.g. intake, accumulation, movement, degradation, toxicity). The effect of NOM on the intake into biota (living cells) is very important. In the present study, the effects of coexisting NOM on the intake of microorganic pollutants into aquatic biota were experimentally evaluated. The NOM was concentrated from Lake Biwa water using a reverse osmosis filtration membrane. Two polycyclic aromatic hydrocarbons (PAH; pyrene and phenanthrene) were used as representative microorganic pollutants. Liposomes were synthesized in the laboratory to simulate living cell membranes and were used to investigate the intake of microorganic pollutants into aquatic biota. The experimental results (PAH onto NOM, NOM into Liposomes, and PAH into Liposomes) indicated that the sorption of PAH into Liposomes was suppressed, apparently by PAH binding with NOM in the aqueous phase. This suggests that the accumulation and/or toxicity of microorganic pollutants can be retarded by NOM in the aqueous environment. Moreover, the experimental results indicated that sorption into Liposomes (the liposome/water sorption coefficient, Klipw) could be a better parameter for estimating the intake of microorganic pollutants into aquatic biota than the n-octanol/water partition coefficient (Kow) in the aqueous environment.
Wil N. Konings - One of the best experts on this subject based on the ideXlab platform.
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amino acid transport in the thermophilic anaerobe clostridium fervidus is driven by an electrochemical sodium gradient
1993Co-Authors: Gea Speelmans, Berend Poolman, Wil N. KoningsAbstract:Amino acid transport was studied in membranes of the peptidolytic, thermophitic, anaerobic bacterium Clostridium fervidus. Uptake of the negatively charged amino acid L-glutamate, the neutral amino acid L-serine, and the positively charged amino acid L-arginine was examined in membrane vesicles fused with cytochrome c-containing Liposomes. Artificial ion diffusion gradients were also applied to establish the specific driving forces for the individual amino acid transport systems. Each amino acid was driven by the DELTAPSI and DELTAmu(Na+)BAR/F and not by the ZDELTApH. The Na+ stoichiometry was estimated from the amino acid-dependent 22Na+ efflux and Na+-dependent H-3-amino acid efflux. Serine and arginine were symported with 1 Na+ and glutamate with 2 Na+. C. fervidus membranes contain Na+/Na+ exchange activity, but Na+/H+ exchange activity could not be demonstrated.
Junichi Takahashi - One of the best experts on this subject based on the ideXlab platform.
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sorption of polycyclic aromatic hydrocarbons into Liposomes Artificial cell membranes and the effects of dissolved natural organic matter
2002Co-Authors: Yoshihisa Shimizu, Junichi Takahashi, Jun Matsubara, Kazuhiro Ikeda, Saburo MatsuiAbstract:Dissolved natural organic matter (NOM) occurs widely in the aquatic environment and affects the fate of microorganic pollutants (e.g. intake, accumulation, movement, degradation, toxicity). The effect of NOM on the intake into biota (living cells) is very important. In the present study, the effects of coexisting NOM on the intake of microorganic pollutants into aquatic biota were experimentally evaluated. The NOM was concentrated from Lake Biwa water using a reverse osmosis filtration membrane. Two polycyclic aromatic hydrocarbons (PAH; pyrene and phenanthrene) were used as representative microorganic pollutants. Liposomes were synthesized in the laboratory to simulate living cell membranes and were used to investigate the intake of microorganic pollutants into aquatic biota. The experimental results (PAH onto NOM, NOM into Liposomes, and PAH into Liposomes) indicated that the sorption of PAH into Liposomes was suppressed, apparently by PAH binding with NOM in the aqueous phase. This suggests that the accumulation and/or toxicity of microorganic pollutants can be retarded by NOM in the aqueous environment. Moreover, the experimental results indicated that sorption into Liposomes (the liposome/water sorption coefficient, Klipw) could be a better parameter for estimating the intake of microorganic pollutants into aquatic biota than the n-octanol/water partition coefficient (Kow) in the aqueous environment.
Jun Matsubara - One of the best experts on this subject based on the ideXlab platform.
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sorption of polycyclic aromatic hydrocarbons into Liposomes Artificial cell membranes and the effects of dissolved natural organic matter
2002Co-Authors: Yoshihisa Shimizu, Junichi Takahashi, Jun Matsubara, Kazuhiro Ikeda, Saburo MatsuiAbstract:Dissolved natural organic matter (NOM) occurs widely in the aquatic environment and affects the fate of microorganic pollutants (e.g. intake, accumulation, movement, degradation, toxicity). The effect of NOM on the intake into biota (living cells) is very important. In the present study, the effects of coexisting NOM on the intake of microorganic pollutants into aquatic biota were experimentally evaluated. The NOM was concentrated from Lake Biwa water using a reverse osmosis filtration membrane. Two polycyclic aromatic hydrocarbons (PAH; pyrene and phenanthrene) were used as representative microorganic pollutants. Liposomes were synthesized in the laboratory to simulate living cell membranes and were used to investigate the intake of microorganic pollutants into aquatic biota. The experimental results (PAH onto NOM, NOM into Liposomes, and PAH into Liposomes) indicated that the sorption of PAH into Liposomes was suppressed, apparently by PAH binding with NOM in the aqueous phase. This suggests that the accumulation and/or toxicity of microorganic pollutants can be retarded by NOM in the aqueous environment. Moreover, the experimental results indicated that sorption into Liposomes (the liposome/water sorption coefficient, Klipw) could be a better parameter for estimating the intake of microorganic pollutants into aquatic biota than the n-octanol/water partition coefficient (Kow) in the aqueous environment.