Damage effects induced by electrically generated negative air ions in Caenorhabditis elegans.
ABSTRACT Electrically generated negative air ions (ENIs) have been widely used to improve indoor air quality. However, the effects of ENIs reported so far were inconsistent due to the variance in test systems, end points detected and the exposure methods. In this study, a simple model organism, the nematode Caenorhabditis elegans, was used as an in vivo system to assess the biological effects of continuous ENIs exposure. The worms were exposed to ENIs in a 10(5) 10(5) ions/cm(3) chamber and their development period, lifespan, brood size and germline cell apoptotisis were examined. The results showed that ENIs decreased the development period, shortened the lifespan, increased the germline cell apoptosis and reduced the brood size, suggesting that persistent ENIs exposure might induce damage in C. elegans. To further scrutinize the mechanisms underlying these damage effects, a reactive oxygen species (ROS) sensitive C. elegans, mev-1(kn1) mutant, and sod-3::gfp transgenic strains were used. The results showed that the persistent ENIs exposure significantly shortened the lifespan of mev-1(kn1) mutant compared to the wild type. Moreover, levels of SOD-3 were increased in an exposure time-dependent manner. Treatment with either DMSO or l-ascorbic acid, effective ROS scavengers, could rescue the upregulation of germline cell apoptosis and SOD-3 level induced by ENIs exposure, indicating that ROS may be involved in ENIs exposure-induced damaging effects.
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ABSTRACT: Physiological anthropology presently covers a very broad range of human knowledge and engineering technologies. This study reviews scientific inconsistencies within a variety of areas: sitting posture; negative air ions; oxygen inhalation; alpha brain waves induced by music and ultrasound; 1/f fluctuations; the evaluation of feelings using surface electroencephalography; Kansei; universal design; and anti-stress issues. We found that the inconsistencies within these areas indicate the importance of integrative thinking and the need to maintain the perspective on the biological benefit to humanity. Analytical science divides human physiological functions into discrete details, although individuals comprise a unified collection of whole-body functions. Such disparate considerations contribute to the misunderstanding of physiological functions and the misevaluation of positive and negative values for humankind. Research related to human health will, in future, depend on the concept of maintaining physiological functions based on consistent science and on sustaining human health to maintain biological welfare in future generations.Journal of PHYSIOLOGICAL ANTHROPOLOGY 01/2013; 32(1):1. · 0.63 Impact Factor
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ABSTRACT: By using Caenorhabditis elegans (C. elegans) as a model animal, the present work is aimed to evaluate the acute toxicity of imidazolium-based bromide Ionic Liquids (ILs), and to elucidate the underlying mechanisms involved. Firstly, 24-h median lethal concentration (LC50) for eight ILs with different alkyl chain lengths and one or two methyl groups in the imidazolium ring were determined to be in a range of 0.09-6.64mgmL(-1). Four ILs were selected to investigate the toxic mechanisms. Mortality, levels of reactive oxygen species (ROS), lipofuscin accumulation and expression of superoxide dismutase 3 in C. elegans were determined after exposed to ILs at sub-lethal concentrations for 12h. A significant increase in the levels of these biomarkers was observed in accordance with the results of 12-h lethality assay. The addition of 0.5% dimethyl sulfoxide, which acts as a radical scavenger, remarkably rescued the lethality of C. elegans and significantly decreased the ROS level in C. elegans. Our results suggest that ROS play an important role in IL-induced toxicity in C. elegans.Chemosphere 09/2013; · 3.14 Impact Factor