This research was carried out to determine the nutritional values and antimicrobial activities of a mixed fruit juice from Coconut (Cocos nucifera) and Pineapple (Ananas comosus) which was pasteurized at 80°C for 10 minutes. The Phytochemical components of the fruit juices were analysed whereby the amount of alkaloids was higher than the amount of flavonoids. The physical properties studied included pH, titratable acidity and total solids. Nutritional, chemical compositions and antimicrobial activities of individual fruit juice and their blend were also carried out using standard methods. Sensory evaluation result showed a significant difference (p<0.05) in their colour, flavour, taste and overall acceptability of the juice blend. Their pH and titratable acidity values that were in reversed manner confer on them longer storage period. The samples had good antimicrobial activities.

This study was carried out to investigate the antimicrobial activities of bacterial isolates of maize against plant pathogens as well as their growth responses to some environmental parameters. Twenty four bacterial isolates were obtained from maize plants collected from the Department of Biological Sciences, AfeBabalola University, Ado-Ekiti. The isolates were characterized by their biochemical and physiological characteristics and were identified as Kurthiazopfu, Morganellamorganic, Rhodococcusequi, Bacillus subtilis, Catabaterhongkongensis, Brevibacteriumotitidis, Lactobacillus coleohominis, Staphylococcus aureus, Propionibacterium acnes among others. Their responses to different NaCl concentrations, sugars, temperature as well as antibiotics were determined. Most of the isolates were able to withstand various environmental parameters in which they were subjected to. Also, eight isolates were able to ferment sucrose. The bacterial isolates showed a degree of resistance to the antibiotics tested. There was a high prevalence of multidrug resistant bacteria showing resistance to 3-8 drugs. The antagonistic effect of the bacterial isolates against selected fungi was determined. None of the isolates showed antagonistic potential against the fungal pathogens. However, the supposed antagonistic bacterial species can be genetically modified to produce secondary metabolites that will result in biocontrol.

Se investigó la tasa de liberación de iones de sodio y potasio para los extractos acuoso, etanólico, metanólico y en acetona de hojas y tallo de Calotropis procera procera L en microorganismos patógenos seleccionados de los géneros de Salmonella typhi, Escherichia coli, Shigella dysenteriae, Staphylococcus aureus, Candida albicans, Malazzesia furfur ATCC 44349 y sus tipos de aislantes, usando la técnica de fotometría de llama. Se encontró que el extracto acuoso era más efectivo para algunos organismos en la salida de sodio e iones del potasio; mientras que otros extractos con solventes como acetona y metanol, también eran eficaces para otro tipo de organismos. Por ejemplo, la cantidad de sodio liberado por los extractos de tallo, mostró que S. typhi y C. albicans presentaron la mayor cantidad de 23 y 24 mg/ml respectivamente. A diferencia de E. coli, que tuvo la mayor cantidad de sodio liberada de 20 mg/ml por extractos de tallo. La comparación de la cantidad de iones de sodio y potasio liberados por los extractos de la planta con dos antibióticos comerciales (tetraciclina y amoxicilina), mostró que la cantidad de sodio liberado por amoxicilina y tetraciclina de Calotropis procera, usando organismos patógenos seleccionados, fue mayor que la cantidad de iones de potasio liberados.