Regional assessment of the impact of mercury on the health of children

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Abstract

Abstract. The total level of mercury (Hg) in human hair is a major biomarker characterizing exposure to methylmercury (MeHg), which is mainly due to fish intake. Analysis of Hg intake with the diet and its content in the hair of children aged 3 – 7 years old from the city of Kazan was carried out. The study of child nutrition was carried out in two directions: individual and family nutrition (questionnaire method) and assessment of public catering (time-weight method). The Hg content was determined by means of inductively-coupled (argon) plasma mass-spectrometry (ICP-MS) on the ELAN-9000 instrument (PerkinElmer, USA). The indices of geometric mean level (GM) and the 95 th percentile in all children were significantly below the limit values recommended by US-EPA (1.0 µg/g) and JECFA/WHO (1.9 µg/g of hair) for the most vulnerable population group. Our study showed a safety Hg exposure due to fish intake for children from Kazan. 

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Scientific Opinion on the risk for public health related to the presence of mercury and methylmercury in food

(2012)

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Characterization of silver nanoparticles synthesized by using marine isolate Streptomyces albidoflavus.

Girija Shankar Guntuku, Sudheer Kumar Yannam, Reddy Shetty Prakasham … (2012)

Silver nanoparticles production by the green chemistry approach was investigated using an isolated marine actinomycetes strain. The isolated strain was identified as Streptomyces albidoflavus based on chemotaxonomic and ribotyping properties. The strain revealed production of silver nanoparticles both extracellular and intracellularly. Surface Plasmon Resonance analysis with the function of time revealed that particle synthesis by this strain is reaction time dependent. The produced particles were spherical shaped and monodispersive in nature and showed a single surface plasmon resonance peak at 410 nm. Size distribution histograms indicated production of 10-40- nm-size nanoparticles with a mean size of 14.5 nm. FT-IR spectra of nanopartilces showed N-H, C-H, and C-N stretching vibrations, denoting the presence of amino acid/ peptide compounds on the surface of silver nanoparticles produced by S. albidoflavus. Synthesized nanoparticles revealed a mean negative zeta potential and electrophoretic mobility of -8.5 mV and -0.000066 cm2/Vs, respectively. The nanoparticles produced were proteinaceous compounds as capping agents with -8.5 mV zeta potential and revealed antimicrobial activity against both Gram-negative and -positive bacterial strains. Owing to their small size, these particles have greater impact on industrial application spectra.