In June, 2006, 19 scientists from eight countries met at the International Agency for Research on Cancer (IARC) in Lyon, France, to assess the carcinogenicity of ingested nitrate and nitrite, and the cyanobacterial peptide toxins microcystin-LR and nodularins. These agents are linked environmentally through the runoff of agricultural fertilisers that increase nitrogen concentrations in surface ...

The composition of leachates is very variable and rich in toxic compounds, which requires treatment before discharge into the natural environment order to avoid their impact on and/or human health comply with requirements regulatory standards environment. Among parameters indicating pollution by leachates, we have COD, BOD5, conductivity, pH, presence ammonium ions, nitrite, nitrate, chloride, ...

Heating mixtures of sodium nitrite, cysteine, and either ferrous sulfate or ferric chloride at 121 C for 20 min at pH 6.5 or 6.3 produced a potent inhibitor of Clostridium perfringens vegetative cells and spores when added to previously heat-sterilized fluid thioglycolate medium. When the mixtures containing FeSO4 at pH 5.2 or FeCl3 at pH 2.7 were heated, the inhibitory effect was not produced....

The International Agency for Research cancer (IARC) has classified nitrite in Group 2A of probable carcinogens to human. Herein, we report on the rapid and selective colorimetric detection using a chemically modified gold nanoparticle (AuNP)-cerium oxide (CeO2) NP-anchored graphene (GO) hybrid nanozyme catalytic assay where acts as main oxidant/target analyte 3,3?,5,5?-tetramethylbenzidine (TMB...

Nitrite and nitrate restore deficient endogenous nitric oxide (NO) production as they are converted back to NO, and therefore complement the classic enzymatic NO synthesis. Circulating nitrate and nitrite must cross membrane barriers to produce their effects and increased nitrate concentrations may attenuate the nitrite influx into cells, decreasing NO generation from nitrite. Moreover, xanthin...

Chloroplasts were prepared from peas (Pisum sativum) in glucose-phosphate medium. In the presence of dl-glyceraldehyde, they catalyzed nitrite-dependent O(2) evolution (mean of 13 preparations, 17.5 mumole per mg chlorophyll per hour, sd 3.64). The optimum concentration of nitrite was 0.5 mm; 0.12 mm nitrite supported V(max)/2. The reaction was accompanied by the consumption of nitrite; 55 to 8...