Argentine squid (Illex argentinus): A source of mycosporine-like amino acids with antioxidant properties.

Here we report on the occurrence of mycosporine-like amino acids (MAAs) in the Argentine shortfin squid, Illex argentinus, the second fishery resource mostly exploited in the Argentinean continental shelf. The total content of four MAAs was evaluated by reverse-phase-HPLC in different tissues (eyes, skin, liver, and gonads). Also, the antioxidant activity of crude extracts was assessed by in-vitro determinations: 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), 2,2-diphenyl-1-picrylhydrazyl (DPPH), Folin-Ciocalteu, and ferrous ion-chelating capacity assays.

Tuning the morphology to enhance the catalytic activity of α-AgWO through V-doping.

Here, we present the synthesis of a highly efficient V-doped α-AgWO catalyst for the oxidation of sulfides to sulfones, exhibiting a high degree of tolerance towards various sensitive functional groups. Remarkably, the catalysts with 0.01% V-doping content exhibited outstanding selectivity towards the oxidation process.

Toxicity and sublethal effects of lead (Pb) intake on honey bees (Apis mellifera).

Heavy metal pollution is becoming a worldwide problem affecting pollinators. The massive use of lead (Pb), the most harmful metal for the biosphere, in industries has increased the risk for honey bees. Pb exerts toxicity on living organisms inducing mainly oxidative stress.

Short communication: Ascorbyl/ascorbate ratio as a marker of oxidative stress in larvae (Apis mellifera) exposed to Paenibacillus larvae.

Paenibacillus larvae, the causal agent of American foulbrood disease (AFB), affects Apis mellifera larvae and can induce oxidative stress by overproduction of radical oxygen species (ROS). This study aimed to assess the oxidative stress levels in larvae exposed to three different strains of P. larvae through their diet by examining the ascorbyl radical (A) to ascorbate anion (AH¯) ratio.

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials.

The influence of manganese modification on the spectroscopic features of manganese-doped CeO systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified, focusing on their interaction with poisonous atmospheres. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn signal, likely due to the reduction of Mn species after the interaction with CO.