The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Katsuya Kato - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of α-trifluoromethylated indoleacetic acid: a potential peroxidase-stable Plant Growth Regulator
Journal of Fluorine Chemistry, 1999Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Yuefa Gong, Satoko Tanaka, Hiroshi KimotoAbstract:Abstract A novel trifluoromethylated indoleacetic acid analog was synthesized by condensation of indole with methyl trifluoropyruvate, and the subsequent reduction. The presence of a trifluoromethyl group at the α-position protected this indoleacetic acid from the oxidation of horseradish peroxidase.
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Effective Preparation of Optically Active 4,4,4-Trifluoro-3-(Indole-3-)Butyric Acid, a Novel Plant Growth Regulator, Using Lipase from Pseudomonas fluorescens
Journal of Fermentation and Bioengineering, 1996Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Hiroshi KimotoAbstract:Optical resolution of 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA), a novel Plant Growth Regulator, was achieved by Pseudomonas fluorescens lipase (lipase AK)-catalyzed enantioselective hydrolysis of its trifluoroethyl ester. Compared with the reactivity of lipase AK for TFIBA ethyl ester, that for TFIBA trifluoroethyl ester was markedly increased, and the reaction was complete within 1 h at 40°C in phosphate buffer containing 10% tert-amyl alcohol. The reactivity of lipase AK for TFIBA trifluoroethyl ester was similar to that for two other TFIBA esters (fluoroethyl and difluoroethyl), and higher than that for other esters (chloroethyl, trichloroethyl, and tribromoethyl). These results suggest that the introduction of fluorine atom(s) into an alcoholic group is an effective way to increase the rate of hydrolysis by lipase AK.
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(S)-(+)-4,4,4-TRIFLUORO-3-(INDOLE-3-)BUTYRIC ACID, A NOVEL FLUORINATED Plant Growth Regulator
Experientia, 1995Co-Authors: M. Katayama, Katsuya Kato, H. Kimoto, Shozo FujiiAbstract:Racemic 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA) has been synthesized and shown to inhibitAvena coleoptile elongation. (S)-(+)-TFIBA (fig. 1), which was prepared by an enzymatic method and markedly promotes root Growth of Chinese cabbage, lettuce and rice Plants, is a novel fluorinated Plant Growth Regulator. Activity of the (S)-(+)-enantiomer of TFIBA was 10-fold greater than that of the (R)-(−)-enantiomer in the first two Plant species and 5-fold greater in rice.
Hiroshi Kimoto - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of α-trifluoromethylated indoleacetic acid: a potential peroxidase-stable Plant Growth Regulator
Journal of Fluorine Chemistry, 1999Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Yuefa Gong, Satoko Tanaka, Hiroshi KimotoAbstract:Abstract A novel trifluoromethylated indoleacetic acid analog was synthesized by condensation of indole with methyl trifluoropyruvate, and the subsequent reduction. The presence of a trifluoromethyl group at the α-position protected this indoleacetic acid from the oxidation of horseradish peroxidase.
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Effective Preparation of Optically Active 4,4,4-Trifluoro-3-(Indole-3-)Butyric Acid, a Novel Plant Growth Regulator, Using Lipase from Pseudomonas fluorescens
Journal of Fermentation and Bioengineering, 1996Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Hiroshi KimotoAbstract:Optical resolution of 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA), a novel Plant Growth Regulator, was achieved by Pseudomonas fluorescens lipase (lipase AK)-catalyzed enantioselective hydrolysis of its trifluoroethyl ester. Compared with the reactivity of lipase AK for TFIBA ethyl ester, that for TFIBA trifluoroethyl ester was markedly increased, and the reaction was complete within 1 h at 40°C in phosphate buffer containing 10% tert-amyl alcohol. The reactivity of lipase AK for TFIBA trifluoroethyl ester was similar to that for two other TFIBA esters (fluoroethyl and difluoroethyl), and higher than that for other esters (chloroethyl, trichloroethyl, and tribromoethyl). These results suggest that the introduction of fluorine atom(s) into an alcoholic group is an effective way to increase the rate of hydrolysis by lipase AK.
Shozo Fujii - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of α-trifluoromethylated indoleacetic acid: a potential peroxidase-stable Plant Growth Regulator
Journal of Fluorine Chemistry, 1999Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Yuefa Gong, Satoko Tanaka, Hiroshi KimotoAbstract:Abstract A novel trifluoromethylated indoleacetic acid analog was synthesized by condensation of indole with methyl trifluoropyruvate, and the subsequent reduction. The presence of a trifluoromethyl group at the α-position protected this indoleacetic acid from the oxidation of horseradish peroxidase.
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Effective Preparation of Optically Active 4,4,4-Trifluoro-3-(Indole-3-)Butyric Acid, a Novel Plant Growth Regulator, Using Lipase from Pseudomonas fluorescens
Journal of Fermentation and Bioengineering, 1996Co-Authors: Katsuya Kato, Shozo Fujii, Masato Katayama, Hiroshi KimotoAbstract:Optical resolution of 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA), a novel Plant Growth Regulator, was achieved by Pseudomonas fluorescens lipase (lipase AK)-catalyzed enantioselective hydrolysis of its trifluoroethyl ester. Compared with the reactivity of lipase AK for TFIBA ethyl ester, that for TFIBA trifluoroethyl ester was markedly increased, and the reaction was complete within 1 h at 40°C in phosphate buffer containing 10% tert-amyl alcohol. The reactivity of lipase AK for TFIBA trifluoroethyl ester was similar to that for two other TFIBA esters (fluoroethyl and difluoroethyl), and higher than that for other esters (chloroethyl, trichloroethyl, and tribromoethyl). These results suggest that the introduction of fluorine atom(s) into an alcoholic group is an effective way to increase the rate of hydrolysis by lipase AK.
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(S)-(+)-4,4,4-TRIFLUORO-3-(INDOLE-3-)BUTYRIC ACID, A NOVEL FLUORINATED Plant Growth Regulator
Experientia, 1995Co-Authors: M. Katayama, Katsuya Kato, H. Kimoto, Shozo FujiiAbstract:Racemic 4,4,4-trifluoro-3-(indole-3-)butyric acid (TFIBA) has been synthesized and shown to inhibitAvena coleoptile elongation. (S)-(+)-TFIBA (fig. 1), which was prepared by an enzymatic method and markedly promotes root Growth of Chinese cabbage, lettuce and rice Plants, is a novel fluorinated Plant Growth Regulator. Activity of the (S)-(+)-enantiomer of TFIBA was 10-fold greater than that of the (R)-(−)-enantiomer in the first two Plant species and 5-fold greater in rice.
Hugh D. Burrows - One of the best experts on this subject based on the ideXlab platform.
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Photophysical characterisation of the Plant Growth Regulator 2-(1-Naphthyl) acetamide
Journal of Photochemistry and Photobiology A: Chemistry, 2013Co-Authors: Eliana Sousa Da Silva, Pascal Wong-wah-chung, Mohamed Sarakha, Hugh D. BurrowsAbstract:The photophysical properties of the widely used Plant Growth Regulator 2-(1-naphthyl) acetamide (NAD) were studied in water and representative organic solvents (ethanol, ethylene glycol, acetonitrile, chloroform, 1,4-dioxane) employing steady-state and time-resolved spectroscopy. Quantum yields and lifetimes of fluorescence, phosphorescence and triplet formation and triplet-triplet absorption spectra were obtained. From these, all radiative and radiationless rate constants have been determined, together with singlet and triplet excited state energies (4.00 and 2.69 eV, respectively). The fluorescence quantum yield and lifetime increased on going from water (ΦF 0.066, τF 35.0 ns) to non-hydrogen bonding solvents (ΦF 0.357, τF 51.0 ns in 1,4-dioxane), probably due to decreased internal conversion. Fluorescence was quenched by several anions through an electron transfer process. A limit on the reduction potential of 1NAD* of E0 2.1 ± 0.2 V was estimated. The attribution of the transient absorption seen in nanosecond laser flash photolysis to 3NAD* was confirmed by energy transfer and oxygen quenching. Quenching of triplet states leads to singlet oxygen formation, with quantum yields varying from 0.097 in water to 0.396 in chloroform. However, these are lower than the triplet state quantum yields, particularly in water (ΦT 0.424), indicating competing quenching pathways, probably involving electron transfer. The relevance of these results to the photoreactivity of NAD under environmental conditions is discussed.
Jaime A. Teixeira Da Silva - One of the best experts on this subject based on the ideXlab platform.
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Thidiazuron-induced abnormalities in Plant tissue cultures
Plant Cell Reports, 2018Co-Authors: Yaser Hassan Dewir, Yougasphree Naidoo, Jaime A. Teixeira Da SilvaAbstract:Thidiazuron (TDZ) is a proven effective and potent synthetic Plant Growth Regulator for organogenic, regeneration, and developmental pathways, including axillary and adventitious shoot proliferation, somatic embryogenesis, and in vitro flowering. TDZ has facilitated the establishment of in vitro cultures for several Plant species, especially woody and recalcitrant Plants, which has enabled their genetic transformation and improvement. Despite the effectiveness and advantages of using TDZ, several drawbacks are associated with its application in Plant tissue culture. This review addresses the morphological, physiological, and cytogenetic abnormalities associated with the use of TDZ in vitro, and provides a summary of these abnormalities in several Plant species.