RESUMO
The menace of drug resistant pathogens is increasing and their level of evading conventional antimicrobials is rising. It is therefore important to discover new antimicrobials to counter the current challenges. Our preliminary investigation identified Bacillus subtilis subsp. subtilis 168 isolated from soil sample sourced from a river bank in Abuja, Nigeria, as the most potent antibiotic-producing bacteria among the other identified producers. The current study screened for the antimicrobial activity of the extract and fractions of the isolate by broth microdilution method. The minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC) and the ratio of the MBC/MIC were determined. All the tested pathogens were susceptible to the ethyl-acetate extract (MIC between 28.70 mg/ml and 57.40 mg/ml). The extract displayed bactericidal activity against all tested pathogens (MBC/MIC between 1.00 and 2.00) while Proteus mirabilis was least susceptible. The extract was purified by vacuum liquid chromatography and the fractions challenged with pathogenic strains. The fraction E was the most potent (MIC between 0.09 mg/ml and 0.75 mg/ml) and also bactericidal against all the test microbes (MBC/MIC between 2.00 and 2.11). GC-MS analysis of the purified sub fraction obtained from fraction E identified 13 compounds with different Retention time and peak areas. Among these were three major compounds which include: (i) bis(2-ethylhexyl) phthalate (ii) 1,4-epoxynaphthalene-1(2H)-methanol, 4,5,7-tris(1,1-dimethylethyl)-3,4-dihydro- (iii) D:B-Friedo-B':A'-neogammacer-5-en-3-ol, (3.beta.)-. Our findings suggest that Bacillus subtilis subsp. subtilis 168 isolated locally could serve as a valuable source of lead compounds for pharmaceutical and biotechnological purposes.
RESUMO
@#Aims: This study is focused to explore Pseudomonas aeruginosastrain mass transport andassessment of the water quality.Methodology and results:Pseudomonas aeruginosahave been detected in the real location at the RBF study areabyusing molecular method. The bacterium strain was cultivated in the river water sample and column study was performed using soil aquifer collected from the RBF study site.Conclusions, significance and impact of the study:The column experiments show the removal of the bacteria was achieved almost 99%. Concentration of cultured bacteria was detected in range 0.26 g/Lto 0.33 g/Land reduced after flow through the soilpassage in range 0 to 0.148 g/L. This study also examines the water qualities that affected during the transport such as turbidity and color. The range of turbidity for initial concentration for both influents was 84-96 NTU was reduced to range 2.88-49.29 NTU. Meanwhile for color, the initial concentration was 51-58 PtCo was reduced to range 1-18 PtCo