Element status of people living in the Middle East territory

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Abstract

Abstract. Element status of 581 subjects (345 women and 86 men 25 – 50 years old; 64 girls and 86 boys 3 – 15 years old) living in the Middle East was estimated using inductively-coupled plasma mass spectrometry (24 chemical elements). The obtained data were compared to available data on the content of chemical elements in human hair reported in literature from other regions of the world. The results showed that Middle East inhabitants are characterized by relatively low levels of cadmium, lead, mercury, arsenic (all groups), silicon, chromium, manganese (adults), aluminum, nickel, cobalt (adult women); high levels of iron (all groups except adult women), sodium, potassium (all groups), and an extreme hair content of boron (all groups, up to 5.02 µg/g median value). The above-mentioned features may occur due to geochemical characteristics of the territory, though contribution of other factors, such as local peculiarities of industry, agriculture, nutrition, and lifestyle, may also be significant. 

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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.