The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform
N Burham - One of the best experts on this subject based on the ideXlab platform.
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uses of 5 methylresorcin bonded Polyurethan Foam as a new solid phase extractor for the selective separation of mercury ions from natural water samples
Central European Journal of Chemistry, 2008Co-Authors: N BurhamAbstract:In this work, 5-Methylresorcin (MR) bonded to untreated Polyurethane Foam (PUF) was successfully employed as a sorbent (MR-PUF) for the selective separation and determination of mercury in natural water samples. Mercury can be quantitatively recovered in the pH range of 5-7. The system presented a minicolumn packed with the new sorbent, where the sample solution was passed through it for a period of time and an eluent solution stripped out the retained mercury, which was further determined with dithizone. The new matrix was characterized by using different tools (IR spectra, stability and density). The kinetics of mercury uptake by the new matrix was found to be fast, reaching equilibrium in 20 minutes. A preconcentration factor of 350 was achieved. The proposed preconcentration procedure was applied successfully to the selective separation and determination of trace mercury in natural water samples.
Tadashi Mizoguchi - One of the best experts on this subject based on the ideXlab platform.
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Continuous antibiotic production by an immobilized cyanobacterium in a seaweed-type bioreactor
Journal of Applied Phycology, 1995Co-Authors: Aparat Chetsumon, Isamu Maeda, Fusako Umeda, Kiyohito Yagi, Yoshiharu Miura, Tadashi MizoguchiAbstract:The filamentous cyanobacterium, Scytonema sp. TISTR 8208, which produces a cyclic peptide antibiotic, was cultivated for 20 d in a seaweed-type bioreactor containing anchored Polyurethan Foam strips. Cells immobilized onto the Foam strips produced the antibiotic for only several days, and the secreted antibiotic disappeared very rapidly from the medium. Cells accumulated the antibiotic intracellularly in a growth-related manner, and secreted it in the stationary phase. Since the antibiotic has a stable physico-chemical nature, the cells seem to take it up and metabolize it. When continuous cultivation was attempted, stable production of the antibiotic was maintained in the bioreactor for 16 d at a dilution rate of 0.01 h^−1. Three times more antibiotic was produced in the continuous culture than in the batch culture by the 16th day.
Aparat Chetsumon - One of the best experts on this subject based on the ideXlab platform.
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Continuous antibiotic production by an immobilized cyanobacterium in a seaweed-type bioreactor
Journal of Applied Phycology, 1995Co-Authors: Aparat Chetsumon, Isamu Maeda, Fusako Umeda, Kiyohito Yagi, Yoshiharu Miura, Tadashi MizoguchiAbstract:The filamentous cyanobacterium, Scytonema sp. TISTR 8208, which produces a cyclic peptide antibiotic, was cultivated for 20 d in a seaweed-type bioreactor containing anchored Polyurethan Foam strips. Cells immobilized onto the Foam strips produced the antibiotic for only several days, and the secreted antibiotic disappeared very rapidly from the medium. Cells accumulated the antibiotic intracellularly in a growth-related manner, and secreted it in the stationary phase. Since the antibiotic has a stable physico-chemical nature, the cells seem to take it up and metabolize it. When continuous cultivation was attempted, stable production of the antibiotic was maintained in the bioreactor for 16 d at a dilution rate of 0.01 h^−1. Three times more antibiotic was produced in the continuous culture than in the batch culture by the 16th day.
Kiyohito Yagi - One of the best experts on this subject based on the ideXlab platform.
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Continuous antibiotic production by an immobilized cyanobacterium in a seaweed-type bioreactor
Journal of Applied Phycology, 1995Co-Authors: Aparat Chetsumon, Isamu Maeda, Fusako Umeda, Kiyohito Yagi, Yoshiharu Miura, Tadashi MizoguchiAbstract:The filamentous cyanobacterium, Scytonema sp. TISTR 8208, which produces a cyclic peptide antibiotic, was cultivated for 20 d in a seaweed-type bioreactor containing anchored Polyurethan Foam strips. Cells immobilized onto the Foam strips produced the antibiotic for only several days, and the secreted antibiotic disappeared very rapidly from the medium. Cells accumulated the antibiotic intracellularly in a growth-related manner, and secreted it in the stationary phase. Since the antibiotic has a stable physico-chemical nature, the cells seem to take it up and metabolize it. When continuous cultivation was attempted, stable production of the antibiotic was maintained in the bioreactor for 16 d at a dilution rate of 0.01 h^−1. Three times more antibiotic was produced in the continuous culture than in the batch culture by the 16th day.
Fusako Umeda - One of the best experts on this subject based on the ideXlab platform.
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Continuous antibiotic production by an immobilized cyanobacterium in a seaweed-type bioreactor
Journal of Applied Phycology, 1995Co-Authors: Aparat Chetsumon, Isamu Maeda, Fusako Umeda, Kiyohito Yagi, Yoshiharu Miura, Tadashi MizoguchiAbstract:The filamentous cyanobacterium, Scytonema sp. TISTR 8208, which produces a cyclic peptide antibiotic, was cultivated for 20 d in a seaweed-type bioreactor containing anchored Polyurethan Foam strips. Cells immobilized onto the Foam strips produced the antibiotic for only several days, and the secreted antibiotic disappeared very rapidly from the medium. Cells accumulated the antibiotic intracellularly in a growth-related manner, and secreted it in the stationary phase. Since the antibiotic has a stable physico-chemical nature, the cells seem to take it up and metabolize it. When continuous cultivation was attempted, stable production of the antibiotic was maintained in the bioreactor for 16 d at a dilution rate of 0.01 h^−1. Three times more antibiotic was produced in the continuous culture than in the batch culture by the 16th day.