Semi-synthetic beta-lactam antibiotics are the most important class of antibacterial agents. Their use in veterinary and human medicine is in continuous expansion. Calcium phosphate bioceramics have been used in medicine and dentistry for nearly 30 years. Calcium phosphate ceramics (CPC) are nowadays being widely used as drug delivery systems because of their desirable properties such as biocompatibility, bioresorbability, controlled release etc. In recent years In this work, kinetic models to describe ampicillin adsorption from CPC were investigated. Calcium phosphate bioceramic are analogous to the mineral component of bones, its properties make it suitable for implant materials and delivery agents of drugs
have demonstrated that atrazine has toxic effects in algae, aquatic plants, aquatic insects, fishes and mammals. Owing to the toxicity and persistence of atrazine in the environment, the search of microbial strains capable of degrading it is fundamental to the development of bioremediation processes, as corrective tools to solve the current problems of the irrational use of agrochemicals. This work aimed the isolation and identification of atrazine degrading bacteria from rizospheric soil, as well as the evaluation of their degradation capacity. Two different atrazine degrading bacteria were isolated and identified as belonging to the genera Arthrobacter and Corynebacterium. Arthrobacter sp. proved to be a better atrazine degrader by the appearance of transparent halos around the colonies when atrazine (0.1 g L −1 ) was the sole carbon and nitrogen source in the medium. In liquid medium, higher specific growth rate (0.0499 hour −1 ) was observed with Arthrobacter sp. when sodium citrate (1 g L −1 ) was an additional source of carbon.
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