Documents disponibles écrits par cet auteur

Effect of mono- and bicyclic monoterpenoids upon dictyostelium minutum and dictyostelium macrocephalum / Jiyoung Hwang in The journal of essential oil research, Vol. 20 N°1 (Janvier/Fevrier 2008) 

Public ISBD [article]  in The journal of essential oil research > Vol. 20 N°1 (Janvier/Fevrier 2008) . - pp. 91-95 Titre : Effect of mono- and bicyclic monoterpenoids upon dictyostelium minutum and dictyostelium macrocephalum Type de document : texte imprimé Auteurs : Jiyoung Hwang, Auteur ; Hiromitsu Hagiwara, Auteur Année de publication : 2008 Article en page(s) : pp. 91-95 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Dictyostelium  minutum  Dictyostelium  macrocephalum  Cellular  slime  molds  (4S)-(+)-carvone  (1S)-(-)-verbenone  (1R)-(-)-fenchone  (1R,5R)-(+)-β-pinene  Inhibition  Enhancement Résumé : We have studied the effect of four monoterpenes on the growth of two cellular slime molds, Dictyostelium minutum Raper and D. macrocephalum Hagiwara, Yeh et Chien. (4S)-(+)-carvone was the monocyclic monoterpene we tested, while (1S)-(-)-verbenone, (1R)-(-)-fenchone, and (1R,5R)-(+)-β-pinene were the bicyclic monoterpenes we employed. One μL of four different concentrations (0.006M, 0.06M, 0.6M and 6M) of each monoterpene were applied to both species, through the use of the Disk Volatilization Technique. (4S)-(+)-carvone possessed a superior inhibitory activity against both D. minutum and D. macrocephalum, at 0.6M concentration (p≤0.001), while growth rate enhancement occurred after application of (4S)-(+)-carvone at concentrations of 0.006M and 0.06M on D. minutum and D. macrocephalum (p<0.05). The inhibitory effects of the monoterpenes on the growth of D. macrocephalum increased proportionally to the applied compound concentrations in most cases. When the bicyclic monoterpenes (1R)-(-)-fenchone and (1S)-(-)-verbenone were administered to D. macrocephalum, however, it was greatly inhibited even at low concentrations (p<0.05 and p<0.001). The bicyclic monoterpene (1R,5R)-(+)-β-pinene inhibited the growth rate of D. minutum and D. macrocephalum at most concentrations, but at 0.006M concentration (1R,5R)-(+)-β-pinene caused slight enhancement. Microscopic examination of changes in the shapes of the fruiting bodies matched the effects observed on the growth rates. These results suggest that the inhibitory or enhancing effects of the selected monoterpenes on both D. minutum and D. macrocephalum depend on the number of cyclic skeletons as well as the concentration of the individual compounds. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2008.9699431 [article] Effect of mono- and bicyclic monoterpenoids upon dictyostelium minutum and dictyostelium macrocephalum [texte imprimé] / Jiyoung Hwang, Auteur ; Hiromitsu Hagiwara, Auteur . - 2008 . - pp. 91-95. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 20 N°1 (Janvier/Fevrier 2008) . - pp. 91-95 Mots-clés : Dictyostelium  minutum  Dictyostelium  macrocephalum  Cellular  slime  molds  (4S)-(+)-carvone  (1S)-(-)-verbenone  (1R)-(-)-fenchone  (1R,5R)-(+)-β-pinene  Inhibition  Enhancement Résumé : We have studied the effect of four monoterpenes on the growth of two cellular slime molds, Dictyostelium minutum Raper and D. macrocephalum Hagiwara, Yeh et Chien. (4S)-(+)-carvone was the monocyclic monoterpene we tested, while (1S)-(-)-verbenone, (1R)-(-)-fenchone, and (1R,5R)-(+)-β-pinene were the bicyclic monoterpenes we employed. One μL of four different concentrations (0.006M, 0.06M, 0.6M and 6M) of each monoterpene were applied to both species, through the use of the Disk Volatilization Technique. (4S)-(+)-carvone possessed a superior inhibitory activity against both D. minutum and D. macrocephalum, at 0.6M concentration (p≤0.001), while growth rate enhancement occurred after application of (4S)-(+)-carvone at concentrations of 0.006M and 0.06M on D. minutum and D. macrocephalum (p<0.05). The inhibitory effects of the monoterpenes on the growth of D. macrocephalum increased proportionally to the applied compound concentrations in most cases. When the bicyclic monoterpenes (1R)-(-)-fenchone and (1S)-(-)-verbenone were administered to D. macrocephalum, however, it was greatly inhibited even at low concentrations (p<0.05 and p<0.001). The bicyclic monoterpene (1R,5R)-(+)-β-pinene inhibited the growth rate of D. minutum and D. macrocephalum at most concentrations, but at 0.006M concentration (1R,5R)-(+)-β-pinene caused slight enhancement. Microscopic examination of changes in the shapes of the fruiting bodies matched the effects observed on the growth rates. These results suggest that the inhibitory or enhancing effects of the selected monoterpenes on both D. minutum and D. macrocephalum depend on the number of cyclic skeletons as well as the concentration of the individual compounds. ISSN : 1041-2905 En ligne : http://www.tandfonline.com/doi/abs/10.1080/10412905.2008.9699431