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15 results on '"Kognou, Aristide Laurel Mokale"'

6. Characterization of Potential Virulence, Resistance to Antibiotics and Heavy Metals, and Biofilm-forming Capabilities of Soil Lignocellulolytic Bacteria

Author

Kognou, Aristide Laurel Mokale, primary, Chio, Chonlong, additional, Khatiwada, Janak Raj, additional, Shrestha, Sarita, additional, Chen, Xuantong, additional, Zhu, Yuen, additional, Ngono Ngane, Rosalie Anne, additional, Agbor Agbor, Gabriel, additional, Jiang, Zi-Hua, additional, Xu, Chunbao Charles, additional, and Qin, Wensheng, additional

Published
2023
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7. Acute and Sub-Chronic Toxicity Evaluation of the Crude Methanolic Bark Extract of <i>Bridelia micrantha</i> (Hochst.) Baill. (Phyllanthaceae) and Its Fraction

Author

Etono, Colette Elysée Aboudi, primary, Lienou, Landry Lienou, additional, Dongmo, Fabrice Fabien Dongho, additional, Kognou, Aristide Laurel Mokale, additional, Tchientcheu, Raphael, additional, Etame, Rebecca Madeleine Ebelle, additional, and Ngane, Rosalie Anne Ngono, additional

Published
2023
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10. Characterization of glucose isomerase-producing bacteria and optimization of fermentation conditions for producing glucose isomerase using biomass.

Author

Kognou, Aristide Laurel Mokale, Chonlong Chio, Khatiwada, Janak Raj, Shrestha, Sarita, Xuantong Chen, Hongwei Li, Yuen Zhu, Zi-Hua Jiang, Chunbao (Charles) Xu, and Wensheng Qin

Subjects
ISOMERASES, GLUCOSE, WHEAT straw, FERMENTATION, BIOMASS
Abstract

Glucose isomerase (GI) is an enzyme with high potential applications. Characterization of GI producing bacteria with interesting properties from an industrial point of view is essential. Bacillus sp., Paenarthrobacter sp., Chryseobacterium sp., Hymenobacter sp., Mycobacterium sp., and Stenotrophomonas sp. were isolated from soil samples. Optimization of enzyme production yield was investigated in various fermentation conditions using response surface methodology. All isolates exhibited maximum GI activity at 40 °C, pH 6-8 after 4 days of incubation. A mixture of peptone/yeast extract or tryptone/peptone enhanced higher enzyme production. The same trend was observed in fermentation medium containing 1% xylose or 2%-2.5% wheat straw. This study advanced the knowledge of these bacterial isolates in promoting wheat straw as feedstock for the bio-based industry. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Characterization of Potential Virulence, Resistance to Antibiotics and Heavy Metals, and Biofilm-Forming Capabilities of Soil Lignocellulolytic Bacteria

Author

Kognou, Aristide Laurel Mokale, Chio, Chonlong, Khatiwada, Janak Raj, Shrestha, Sarita, Chen, Xuantong, Zhu, Yuen, Ngono Ngane, Rosalie Anne, Agbor Agbor, Gabriel, Jiang, Zi-Hua, Xu, Chunbao Charles, and Qin, Wensheng

Abstract

Soil bacteria participate in self-immobilization processes for survival, persistence, and production of virulence factors in some niches or hosts through their capacities for autoaggregation, cell surface hydrophobicity, biofilm formation, and antibiotic and heavy metal resistance. This study investigated potential virulence, antibiotic and heavy metal resistance, solvent adhesion, and biofilm-forming capabilities of six cellulolytic bacteria isolated from soil samples: Paenarthrobactersp. MKAL1, Hymenobactersp. MKAL2, Mycobacteriumsp. MKAL3, Stenotrophomonassp. MKAL4, Chryseobacteriumsp. MKAL5, and Bacillussp. MKAL6. Strains were subjected to phenotypic methods, including heavy metal and antibiotic susceptibility and virulence factors (protease, lipase, capsule production, autoaggregation, hydrophobicity, and biofilm formation). The effect of ciprofloxacin was also investigated on bacterial susceptibility over time, cell membrane, and biofilm formation. Strains MKAL2, MKAL5, and MKAL6 exhibited protease and lipase activities, while only MKAL6 produced capsules. All strains were capable of aggregating, forming biofilm, and adhering to solvents. Strains tolerated high amounts of chromium, lead, zinc, nickel, and manganese and were resistant to lincomycin. Ciprofloxacin exhibited bactericidal activity against these strains. Although the phenotypic evaluation of virulence factors of bacteria can indicate their pathogenic nature, an in-depth genetic study of virulence, antibiotic and heavy metal resistance genes is required.

Published
2022
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