Quorum sensing (QS) has been extensively studied in pure stains of microorganisms, but the ecological roles QS multi-species microbial aggregates are poorly understood due to aggregates’ heterogeneity and complexity, particular phosphorus (P) entrapment, a key aspect element cycling. Using periphytic biofilm as microbial-aggregate model, we addressed how signaling via N-acyl-homoserine-lactones...

BACKGROUND AND AIMS Vitamin E helps to control the cellular redox state by reacting with singlet oxygen and preventing the propagation of lipid peroxidation in thylakoid membranes. Both plant ageing and phosphorus deficiency can trigger accumulation of reactive oxygen species, leading to damage to the photosynthetic apparatus. This study investigates how phosphorus availability and vitamin E in...

The effect of nitrogen and phosphorus availability on the growth Sulfolobus metallicus was analyzed. This archaeon subjected to a series limitation conditions determine their effects growth. results indicate that showed relationship between one intermediate oxidation products (tetrathionate) cell concentration during exponential phase in absence nitrogen. Furthermore, significant differences we...

Stress has been shown to be associated with altered homeostasis that may lead to oxidant-antioxidant imbalance. Non-enzymatic antioxidants are important regulators of reactive oxygen species produced in extra-cellular milieu and represent the first line of defense against them. Extra-cellular non-enzymatic antioxidants may be disturbed by the production of superoxide and nitric oxide and this h...