The main problem about plastic packaging after their use is the fate of waste disposed into environment. This study was carried out in aquatic microcosm and aimed at assessing impact temperature an acidic environment on polyethylene degradation by bacterium Pseudomonas aeruginosa, as well electrical conductivity medium temporal abundance dynamics cells involved. Sterilized pieces 0.08 g weight were immersed sterile mineral solutions pH 5 glass flasks containing P. aeruginosa concentration...

Abstract This study was aimed at assessing the prevalence of pathogenic E scherichia coli strains, relative to total count . , faecal coliforms and other heterotrophic mesophilic aerobic bacteria ( HMAB ) isolated in groundwater equatorial region C ameroon entral A frica). Bacteria were using standard methods. Pathogenic strains then identified haemagglutination antisera tests. The maximum abundance 4.9 × 10 6 5.6 3 1 colony‐forming units CFU )/100 mL respectively. reached /100 counts...

The abundance dynamic of some freshwater invertebrates in relation with the abiotic factors medium was studied from March 2013 to 2014 on main streams Wouri and Sanaga basins. Individuals Copepoda, Atyidae, Chironomidae Physidae were collected, identified counted. Samplings carried out monthly; meanwhile measurements environmental variables taken. Results physico-chemical analyses revealed that water basin is globally well oxygenated (77% - 92%) faintly mineralized (14 107 μS/cm), excepted...

The synergistic effects of the combined treatments NaOCl and H 2 O on elimination A. hydrophila adhered to polythene under static dynamic conditions were evaluated. concentrations 0.1, 0.2, 0.3<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mtext>‰</mml:mtext></mml:mrow></mml:math> 0.5, 1, 1.5<mml:math id="M2"><mml:mrow><mml:mtext>‰</mml:mtext></mml:mrow></mml:math> used. contact periods 180, 360, 540, 720 minutes. abundance cells reached 2.47 2.27 units (log...

Abstract Microorganisms' retention in soil contributes to the natural purification of groundwater. Bacteria found groundwater are generally various shapes. The aim this study was assess importance cell shape and flagella bacterial during polluted water percolation through two columns CA CB, equatorial region Central Africa. Percolation tests were carried out using different loads samples which contaminated by Escherichia coli (straight rods, peritrichous flagella), Vibrio parahaemolyticus...

Principal component analysis (PCA) was used to comprehensively evaluate the relationship between physicochemical and bacteriological parameters of water on banks Wouri. At each sampling station, focused Water temperature, pH, dissolved oxygen, CO2, electrical conductivity, suspended solids, nitrates, ammonium ions, orthophosphates, color, salinity, turbidity. The consisted isolation heterotrophic aerobe bacteria (HAB), faecal bacteria, some pathogenic bacteria. PCA showed that two factorial...

Microcosm experiments were carried out to investigate the effect of Eucalyptus microcorys aqueous plant extract on pathogenic Escherichia coli survival in water. The results clearly showed that combined light and concentration impacted significantly bacteria. dark inhibition coefficient (KD) was 0.102 h-1, 0.116 0.111 0.123 0.136 h-1 0.146 with 0.05%, 0.1%, 0.5%, 1%, 1.5% 2% respectively. In conditions, we noted a relative increase (KL). Self-Organizing Map according incubation duration...

A study was carried out with the objective of evaluating microbiological and physicochemical quality surface water in Nkolafamba subdivision, Center Region Cameroon. Five sampling points were selected based on several criteria. The bacteria isolated Mesophilic Aerobic Heterotrophic Bacteria (BHAM), that witnesses to faecal contamination Pseudomonas. Some abiotic parameters measured using usual techniques. results show some such as temperature almost constant around 25 °C during period. There...

This study aimed at assessing the impact of some wells abiotic factors on antimicrobial susceptibility Pseudomonas aeruginosa isolated. A total 14 well waters Douala and Yaoundé towns (Cameroon, Central Africa) were chosen. Fifteen antibiotics used to test with majority belonging β-lactam, aminoglycoside quinolone groups. Result showed that in Douala, electrical conductivity water ranged from 145.38 559.69 μS/cm well, while Yaoundé, it 172.5 710.2 μS/cm. Dissolved oxygen 2.5 5.5 mg/l 3.9 5.1...

This study aimed to evaluate in microcosm condition, the survival of Aeromonas hydrophila and Enteropathogenic Escherichia coli (EPEC), presence M. oleifera aqueous seeds extract at concentrations varying from 1 40 g/L, under 4 °C 23 incubation temperature. It has been noted that cell abundances decrease gradually with increasing concentration. However, a marked cells regrowth was sometimes noted. In monospecies °C, EPEC inhibition percentages (CIP) values varied 52.12 99.84%. Those A. 13.2...

The health problems caused waterborne pathogens bacteria belonging to the Enterobacteriaceae family are aggravated by rise of antimicrobial resistant phenomenon. This has been identified as one biggest global challenges. present study aims make a comparative approach sensitivity/resistance antibiotics 4 Enterobacter cloacae, Citrobacter freundii, Salmonella typhi and Shigella sonnei isolated from wastewater, streams groundwater in Yaounde town (Cameroon, Central Africa). Bacteria were using...

The main purpose of this investigation was to rank, in hierarchical order, some soil chemical factors that impact the sorption parameters fecal indicator bacteria and Salmonella sp, during their transfer from surface groundwater table. Sorption coefficients (Kf) linearity exponents (Ϫ) were obtained using Freundlich isotherm. When sp present alone, values Kf varied 2.70 log units mg−1 7.84 soil, Ϫ 0.04 2.70. two present, 0.48 8.53 0.06 1.19. mixed, 1.73 7.70 0.09 0.88. predominant...

The present study assessed the abiotic factors of Moringa stenopetala (M. stenopetala) extracts against Staphyloccoccus aureus in aquatic microcosm. Bacterial survival was using colony forming unit (CFU) method on culture agar medium at different concentration levels (0.5 to 2 g/L). incubation duration varied from 3 24 hours, and temperatures were between 7°C 44°C. Phytochemical screening showed that most constituents obtained are alkaloids, flavonoids tannins. It observed increase extract...

A study aimed at evaluating the seasonal variation of Vibrio and Salmonella in developed groundwater used for drinking water commune Ntui, Center Region Cameroon was conducted from January to July 2021. The microorganisms sought were Aerobic Heterotrophic Mesophilic Bacteria (BHAM), bacteria genera. These isolated ten (10) points by surface spreading technique on ordinary agar BHAMs that filter membranes Thiosulfate Citrate Bile Sucrose (TCBS) Salmonella-Shigella (SS) media. respectively....

As water resources in urban areas are becoming increasingly degraded, due large part to poor sanitation, a study has been was conducted examine the influence of physicochemical parameters and seasonal variation on distribution enterobacteria &amp;lt;i&amp;gt;Escherichia coli&amp;lt;/i&amp;gt; &amp;lt;i&amp;gt;Salmonella &amp;lt;/i&amp;gt;spp that have isolated from streams city Yaounde. Bi-monthly samples were collected nine rivers during 12 months (April 2010 March 2011). The isolation...

A study to compare bacterial populations in sea, ground and stream waters assess the importance of some abiotic factors on these was carried out town Kribi (on Cameroonian coast) from January March 2024. The bacteria sought were Aerobic Mesophilic Heterotrophic Bacteria (AMHB) staphylococci. They isolated using surface spreading technique Petri dishes PCA media (Rapid Labs, ref CM-PCASP051) membrane filtration Chapman mannitol medium (HIMEDIA, MH118-500G), for AMHB staphylococci...

A bacteriological and physicochemical study was conducted in the waters of farms mountainous regions Cameroon. The different water samples were collected during two campaigns December 2018 February 2019. Ten stations representing drinking supply points our area identified. results showed that these contained both pathogenic commensal fecal bacteria. highest abundances reached 10x103 CFU/100mL for Salmonella sp., 72x103 Staphylococcus aureus, 102x103 Brucella suis 40x103 abortus. These...