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Heriberto Rodríguez-Tobías,Graciela Morales,Hortensia Maldonado-Textle,Daniel Grande 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
Composite mats based on submicron biopolyester fibers, such as poly(3-hydroxyalkanoate)s, and zinc oxide(ZnO) nanoparticles have been exploited in medicine and environmental areas, as antibacterial wound dressings or filters. Generally, the resulting mats have to be subjected to UV irradiation in order to promote the formation of reactive oxygenspecies, thus activating the antimicrobial or photocatalytic effect of ZnO. Therefore, investigation related to the influence ofZnO on poly(3-hydroxyalkanoate)s photo-degradation is required. In this context, the present paper addresses the long-termphoto-degradation of nanofibrous poly(3-hydroxybutyrate) (PHB)/ZnO composites derived from two complementaryelectro-hydrodynamic techniques, namely electrospinning or electrospinning/electrospraying tandem processes. A thoroughinvestigation of the as-obtained PHB/ZnO fibrous composites implying the utilization of ATR-FTIR, SEC, and SEM analysispre- and post-aging under UV irradiation (313 nm) for a period of time of 500 h to study the effect of electro-hydrodynamictechnique utilized and the ZnO content on the UV shielding properties of PHB mats.
Enterobacter cloacae, an Emerging Plant-Pathogenic Bacterium Affecting Chili Pepper Seedlings
Garcia-Gonzalez, Tanahiri,Saenz-Hidalgo, Hilda Karina,Silva-Rojas, Hilda Victoria,Morales-Nieto, Carlos,Vancheva, Taca,Koebnik, Ralf,Avila-Quezada, Graciela Dolores The Korean Society of Plant Pathology 2018 Plant Pathology Journal Vol.34 No.1
A previously unreported bacterial disease on chili pepper (Capsicum annuum L.) seedlings affecting as many as 4% of seedlings was observed in greenhouses in Chihuahua, Mexico (Delicias and Meoqui counties). Initial lesions appeared as irregular small spots on leaves and brown necrosis at margins tips were observed. Later, the spots became necrotic with a chlorotic halo. Advanced disease was associated with defoliation. A Gram negative, rod-shaped bacterium was isolated from diseased chili pepper seedlings. Three inoculation methods revealed that isolated strains produce foliage symptoms, similar to those observed in naturally infected seedlings. Pathogenic strains that caused symptoms in inoculated seedlings were re-isolated and identified to fulfill koch's postulate. Polyphasic approaches for identification including biochemical assays (API 20E and 50CH), carbon source utilization profiling (Biolog) and 16S rDNA, hsp60 and rpoB sequence analysis were done. Enterobacter cloacae was identified as the causal agent of this outbreak on chili pepper seedlings.
Enterobacter cloacae, an Emerging Plant-Pathogenic Bacterium Affecting Chili Pepper Seedlings
Tanahiri García-González,Hilda Karina Sáenz-Hidalgo,Hilda Victoria Silva-Rojas,Carlos Morales-Nieto,Taca Vancheva,Ralf Koebnik,Graciela Dolores Ávila-Quezada 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.1
A previously unreported bacterial disease on chili pepper (Capsicum annuum L.) seedlings affecting as many as 4% of seedlings was observed in greenhouses in Chihuahua, Mexico (Delicias and Meoqui counties). Initial lesions appeared as irregular small spots on leaves and brown necrosis at margins tips were observed. Later, the spots became necrotic with a chlorotic halo. Advanced disease was associated with defoliation. A Gram negative, rod-shaped bacterium was isolated from diseased chili pepper seedlings. Three inoculation methods revealed that isolated strains produce foliage symptoms, similar to those observed in naturally infected seedlings. Pathogenic strains that caused symptoms in inoculated seedlings were re-isolated and identified to fulfill koch´s postulate. Polyphasic approaches for identification including biochemical assays (API 20E and 50CH), carbon source utilization profiling (Biolog) and 16S rDNA, hsp60 and rpoB sequence analysis were done. Enterobacter cloacae was identified as the causal agent of this outbreak on chili pepper seedlings.