Sulfonamides [KLH]

Anaerobic digestion has been used to treat antibiotic-contaminated wastewaters. However, it is not always effective, since biodegradation is the main removal mechanism and depends on the compound chemical characteristics and on how microbial metabolic pathways are affected by the reactor operational conditions and hydrodynamic characteristics. The aim of this study was to develop a mathematical model to describe 16 metabolic pathways of an anaerobic process treating sulfamethazine-contaminated wastewater. Contois kinetics and a useful reaction volume term were used to represent the biomass concentration impact on bed porosity in a N continuously stirred tank modeling approach. Two sulfamethazine removal hypotheses were evaluated: an apparent enzymatic reaction and a cometabolic degradation. Additionally, long-term modeling was developed to describe how the operational conditions affected the performance of the process. The best degradation correlations were associated with the consumption of carbohydrates, proteins and it was inversely related to acetic acid production during acidogenesis.

Members of theNocardiagenus are ubiquitous in the environment. These aerobic, gram-positive organisms can lead to life-threatening infection, typically in immunocompromised hosts such as solid organ transplant recipients or those receiving immunosuppressive medications for other reasons. This current review discusses the microbiology of nocardiosis, risk factors for infection, clinical manifestations, methods for diagnosis, and treatment. Nocardiosis primarily affects the lung but may also cause skin and soft tissue infection, cerebral abscess, bloodstream infection, or infection involving other organs. Although rare as a cause of community-acquired pneumonia,Nocardiacan have severe morbidity and mortality, particularly in patients with comorbidities or compromised immunity. Early diagnosis and timely initiation of therapy are critical to optimizing patient outcomes. Species identification is important in determining treatment, as is in vitro susceptibility testing. Sulfonamide therapy is usually indicated, although a variety of other antimicrobials may be useful, depending on the species and susceptibility testing. Prolonged therapy is usually indicated, for 6 to 12 months, and in some cases surgical debridement may be required to resolve infection.