Differential Effects of Varying Concentrations of Phosphorus, Iron, and Nitrogen in N-Fixing Cyanobacteria.

Diazotrophs or N-fixers are one of the most ecologically significant groups in marine ecosystems (pelagic and benthic). Inorganic phosphorus (PO ) and iron (Fe) can limit the growth and N-fixing capacities of cyanobacteria. However, studies investigating co-limitation of these factors are lacking.

Targeting NF-κB signaling pathway in cancer by dietary polyphenols.

Being a transcription factor, NF-κB regulates gene expressions involving cell survival and proliferation, drug resistance, metastasis, and angiogenesis. The activation of NF-κB plays a central role in the development of inflammation and cancer. Thus, the down-regulation of NF-κB may be an exciting target in prevention and treatment of cancer.

Changes in circulating cytokines and markers of muscle damage in elite cyclists during a multi-stage competition.

The purpose of this study was to determine the changes in the basal and post-exercise plasma markers of muscular damage, lipid peroxidation and cytokines in eight male well-trained semiprofessional cyclists, in response to a three consecutive-day cycling competition. Serum markers of oxidative and muscular damage - creatine kinase activity, lactate dehydrogenase activity, myoglobin and malondialdehyde (MDA), creatinine and nitrite levels - followed a sawtooth-type representation throughout the competition. MDA showed an accumulative pattern, evidenced in the post-race values of the third stage which were significantly higher with respect to the values of the first stage.