Ecological-geochemical characteristics of lead levels in the environment and human biosubstrates of residents of the Orenburg region

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Abstract

Abstract. Data on the content of lead in water, the soil, wheat, and hair of inhabitants of the western, central, and eastern areas of the Orenburg region are presented in this article. 525 samples of water, soil, and wheat and 420 samples of human hair were studied using atomic absorption and mass spectrometry with inductively-coupled plasma, respectively. It is estimated that in underground waters, the soil, and wheat of the eastern area the content of lead is the highest in comparison with the western and central areas of the region. In hair of inhabitants of the eastern area, the level of lead exceeded the respective values in the western and central areas by a factor of 2.2 (p < 0.001) and 1.5 (p < 0.001), respectively. 

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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.