Results 261 to 270 of about 109,878 (309)
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OSHA and elongate mineral particles
Toxicology and Applied Pharmacology, 2018The United States Occupational Safety and Health Administration (OSHA) was established to provide guidance to protect workers from hazards in the workplace. After broadly adopting extant health and safety standards, OSHA promulgated an expanded standard for regulation of asbestos.
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Elongate mineral particles in the natural environment
Toxicology and Applied Pharmacology, 2018When considering elongate mineral particles (EMPs) in the natural environment it is important to first: 1) define what an elongate mineral is and 2) present what we as mineralogists and geologists know about their distribution. However, it is often very difficult to define the natural world, instead we physical scientists resort to describing it.
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Mineral and organic particles in astronomy
Astrophysics and Space Science, 1989A mixture of inorganic mineral grains comprised mainly of silica with linked SiO4 tetrahedra together with organic grains characterised by the spectrum of an ‘average’ bacterium provides excellent agreement with astronomical data relating to broad 10 and 20μm emission and absorption features.
N. C. Wickramasinghe +2 more
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The friction of mineral particles
British Journal of Applied Physics, 1958The coefficient of friction of loose particles slid between parallel plates is approximately proportional to the Mohs hardness of the particles. The particles are crushed during sliding.
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The influence of mineral particles on fibroblast behaviour: A comparative study
Colloids and Surfaces B: Biointerfaces, 2018Minerals are versatile tools utilised to modify and control the physical-chemical and functional properties of substrates. Those properties include ones directing cell fate; thus, minerals can potentially provide a direct and inexpensive method to manipulate cell behaviour.
Diosangeles Soto Veliz +3 more
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Crystallization of polyamide in alcoholic suspensions of mineral particles
Polymer Science U.S.S.R., 1969Abstract Polyamide 666 (ultramide 6A) has been crystallised in alcohol suspensions of quartz, asbestos, barium sulphate and oxides of iron, zinc or chromium and the heterogeneous nucleation has been studied in an electron microscope. The kinetics of growth and structure of the grown polymer is reported.
E.D. Yakhnin +4 more
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Sorption kinetics of ofloxacin in soils and mineral particles
Environmental Pollution, 2012The environmental behavior of antibiotics is not well known and the precise environmental risk assessment is not practical. This study investigated the sorption kinetics of ofloxacin, a widely used antibiotics, on soil particles with different organic carbon contents as well as soil components (a humic acid, ferric oxide and kaolinite). Two-compartment
Bo, Pan +5 more
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Tefluthrin Sorption to Mineral Particles: Role of Particle Organic Coatings
International Journal of Environmental Analytical Chemistry, 1995Abstract The sorption of tefluthrin was studied on “pure” clay minerals and those that had been coated with aquatic humic substances over a mass percent carbon range of 0.02 to 2.15. Tefluthrin sorption onto humic-coated minerals was significantly greater than on to the clean minerals and increased with increasing quantities of sorbed humic substances.
J. L. Zhou +4 more
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Interaction between Biopolyelectrolytes and Sparingly Soluble Mineral Particles
Langmuir, 2010We investigate the complex physicochemical behavior of dispersions containing calcium carbonate (CaCO(3)) particles, a sparingly soluble mineral salt; and carrageenans, negatively charged biopolyelectrolytes containing sulfate groups. We reveal that the carrageenans suspend and stabilize CaCO(3) particles in neutral systems by absorbing on the particle
Versluis, P., Popp, A.K., Velikov, K.P.
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Exposure to mineral sands dust particles
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2004Abstract The aim of this study is to characterize the airborne particles in a Brazilian region with high concentration of mineral sands (Buena village). In this study proton induced X-ray emission (PIXE), plasma desorption mass spectrometry and alpha spectrometry were used for analyses of airborne particles.
K. Dias da Cunha +2 more
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