Xu Gao, Ziqi Shen, Jinliang Xu, Min Fan, Qiang Li^*

Phyton-International Journal of Experimental Botany, Vol.92, No.7, pp. 1987-1999, 2023, DOI:10.32604/phyton.2023.027318 - 29 May 2023

Abstract Phytophthora nicotianae causes substantial economic losses in most countries where tobacco is produced. At present, the control of P. nicotianae mainly depends on chemical methods, with considerable environmental and health issues. We investigated the effects of ethanol extracts from Scutellaria baicalensis Georgi (SBG) and Magnolia officinalis (MO). On mycelial growth, sporangium formation, and zoospore release of P. nicotianae. Both extracts inhibited the growth of P. nicotianae, with mycelial growth inhibition rates of 88.92% and 93.92%, respectively, at 40 mg/mL, and EC50 values of 5.39 and 5.74 mg/mL, respectively. The underlying mechanisms were the inhibition of sporangium formation, the reduction of zoospore More >

MARÍA DE LOS ANGELES ALVAREZ, VALERIA E. P. ZARELLI, NORA B.PAPPANO, NORA B. DEBATTISTA

BIOCELL, Vol.28, No.1, pp. 31-34, 2004, DOI:10.32604/biocell.2004.28.031

Abstract In previous work the bacteriostatic action of trihydroxylated chalcones against Staphylococcus aureus ATCC 25 923 was investigated. In this work the action of 2´, 4´, 2-(OH)₃ -chalcone, 2´, 4´, 3-(OH)_3^- chalcone and 2´, 4´, 4-(OH)₃ –chalcone against Escherichia coli ATCC 25 922 was evaluated. Growth kinetic curves of E.coli were made in nutritive broth added with increasing drug concentrations. The specific growth rates of the microorganisms were calculated by a kinetic turbidimetric method, which was previously probed and the minimal inhibitory concentrations (MIC´s) were evaluated by a mechanism of action proposed. The MICs of 2´, 4´, 3-(OH)₃ -chalcone and 2´, More >