[word=□ | □] □
[word="," | □] □
At the time of the filing of the petition , FDA considered the pigments that are the subjects of this petition to be color additive mixtures of synthetic iron oxide , mica , and titanium dioxide . The FeH2 particles had a shell made of iron oxide , and the FeBH had a shell that included boron oxide as well as iron oxide . At the center of each particle is iron oxide , a good contrast agent for MRI scans . Direct side-view imaging of the nanopillars by transmission electron microscopy shows the vertical polysilicon core wire surrounded by oxide , and vertically-stacked Si nano-islands connected to the wire through thin insulator layers . Many insulating materials such as oxides , carbides and nitrides do not couple to the RF frequency . In general , cleaning an aluminum alloy refers to minimizing the following contaminants : 1 ) dissolved gases , especially hydrogen , 2 ) alkaline elements , such as sodium , lithium , and calcium , and 3 ) unwanted solid particles , such as oxides , carbides , and a variety of intermetallic compounds . Porewater data from the upper half of the sediment column ( ~ 0 to 150 mbsf ) document a vertically extended sequence of successive reduction zones that closely resembles the sequence seen in near shore sediments on centimeter to decimeter depth-scales ( with depth-dependent transitions from a zone of oxygen reduction to successive zones of nitrate , manganese oxide , iron oxide , and sulfate reduction ) . These are usually compounds , such as oxides , sulfides , or silicates , but may be any substance that is foreign to the matrix whether it is soluble or insoluble . On the other hand , non-metallic refractories such as oxides , carbides , or nitrides are quite strong and not affected by the presence of oxygen . If a particle is thick covered by oxide , its ignition temperature will be at the melting point of Al oxide . Our effort consists of molecular-level simulations in two key areas of geochemistry and biogeochemistry : ( 1 ) microbial surface mediated processes : the effects of lipopolysaccharides present on gram-negative bacteria ; and ( 2 ) mineral surface interactions : providing a molecular-scale understanding of surface complexation reactions at oxide , oxyhydroxide , and silicate minerals . The dust components of most concern are asbestos ( cancer , lung disease ) , fiberglass ( skin , eye , and respiratory irritant , suspect carcinogen ) , cement and drywall dust ( respiratory irritant , caustic , contains silica dust which can cause serious lung disease and cancer ) , organic particulates from burning plastic such as polyvinyl chloride , PCBs , dioxins and other polynuclear aromatic hydrocarbons , and metals such as lead , copper , iron oxide , and cadmium . I certainly believe that oxides , nitrogen , sulfur , and mercury , should be regulated in the traditional sense that we regulate it .