Biosurfactant production and growth kinetics studies of the waste canola oil-degrading bacterium Rhodococcus erythropolis AQ5-07 from Antarctica

first_imgWith the progressive increase in human activities in the Antarctic region, the possibility of domestic oil spillage also increases. Developing means for the removal of oils, such as canola oil, from the environment and waste “grey” water using biological approaches is therefore desirable, since the thermal process of oil degradation is expensive and ineffective. Thus, in this study an indigenous cold-adapted Antarctic soil bacterium, Rhodococcus erythropolis strain AQ5-07, was screened for biosurfactant production ability using the multiple approaches of blood haemolysis, surface tension, emulsification index, oil spreading, drop collapse and “MATH” assay for cellular hydrophobicity. The growth kinetics of the bacterium containing different canola oil concentration was studied. The strain showed β-haemolysis on blood agar with a high emulsification index and low surface tension value of 91.5% and 25.14 mN/m, respectively. Of the models tested, the Haldane model provided the best description of the growth kinetics, although several models were similar in performance. Parameters obtained from the modelling were the maximum specific growth rate (qmax), concentration of substrate at the half maximum specific growth rate, Ks% (v/v) and the inhibition constant Ki% (v/v), with values of 0.142 h−1, 7.743% (v/v) and 0.399% (v/v), respectively. These biological coefficients are useful in predicting growth conditions for batch studies, and also relevant to “in field” bioremediation strategies where the concentration of oil might need to be diluted to non-toxic levels prior to remediation. Biosurfactants can also have application in enhanced oil recovery (EOR) under different environmental conditions.last_img read more

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Ocean City Home Bank Donates to American Legion Building Fund

first_imgOcean City Home Bank presents a $500 check to the American Legion Morvay-Miley Post 524 in support of their building fund. After many years of serving the Ocean City community, Post 524 is looking to build a new home at 46th Street and West Avenue in Ocean City. The new facility will be designed to better serve current post members as well as future generations of veterans.Pictured from left to right:  Jack Hagan, American Legion; Jean Jacobson, Ocean City Home Bank;  John Quinn, American Legion; Bob Marzulli, Commander American Legion Post 524; Rob Cozen, American Legion Building Fundraising Chairman;  Katie Greck, Ocean City Home Bank;  Bill Cruise, American Legion;  Joe Rebl, American Legion;  and Ken Byerly, American Legion Building Committee Chairman.last_img

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