CR(VI) phytoremediation by hairy roots of Brassica napus: assessing efficiency, mechanisms involved, and post-removal toxicity.

Industrial activities such as leather tanning involve the use of highly toxic inorganic pollutants, like Chromium (Cr). This work evaluated Cr(VI) remediation by hairy roots (HR) of Brassica napus, paying close attention to the mechanisms involved and the toxicity of post-removal solutions. Results showed that these roots were capable of tolerating concentrations of up to 10 mg L-1 Cr(VI), while higher concentrations were toxic for HR development. Removal efficiency was assessed through the use of synthetic solutions containing different initial Cr(VI) concentrations (2, 5, or 10 mg L-1). Regardless of these initial concentrations, the highest removal efficiency values were between 80 and 90% after 24 and 48 h of treatment, using a 2.0 g inoculum. The mechanisms involved were Cr accumulation (60%) and to a lesser extent, adsorption to the root biomass (30%). A fraction of Cr(VI) was intracellularly reduced to Cr(III), which suggests reductases may have played a role. Additionally, post-removal toxicity was evaluated through two bioassays (Lactuca sativa L. and AMPHITOX test) after the removal of 10 mg L-1 Cr(VI). The treated solutions showed moderate phytotoxicity for L. sativa L. and no toxicity for R arenarum. The ability of HR to remove 10 mg L-1 Cr(VI) from real tannery effluents collected from a regional industry (Córdoba province, Argentina) was also determined. The high removal efficiency observed (98%) demonstrates this system can be successful in treating complex wastewaters.

Anetodermia primaria asociada a lupus eritematoso sistémico. A propósito de un caso / Associated primary anemia to systemic lupus erythematosus About a case

La anetodermia es un trastorno elastolítico infrecuente, caracterizado clínicamente por áreas de piel laxa y pérdida o disminución de las fibras elásticas en la histología. Este hallazgo sin enfermedad cutánea previa es conocido como anetodermia primaria y se suele asociar a enfermedades autoinmunes; dentro de éstas el lupus eritematoso sistémico (LES), con anticuerpos antifosfolipídicos, y el síndrome antifosfolipídico (SAF) son las más frecuentes. Presentamos una paciente con anetodermia primaria, LES y anticuerpos antifosfolipídicos positivos sin clínica de SAF (AU)

Anetoderma is an infrequent elastolytic disorder, clinically characterized by areas with lack of the skin and decreased elastic fibers at histology. This finding without previous skin disease is known as primary anetoderma and is often associated with autoimmune diseases such as systemic lupus erythematosus (SLE), with antiphospholipid antibodies, and antiphospholipid syndrome (APS). A female patient with primary anetoderma, SLE and positive antiphospholipid antibodies without clinical APS is reported (AU)