but a brain cell doesn't attach in a standard way and then function. it derives it's function from how it is attached. so it can't just be replaced. a new brain cell could only take the place of a dead one if it were to go through the exact same learning experience, which will of course never happen. so the specific memory aspect can't be .
despite being used in 90% of gold production: gold cyanidation is controversial due to the toxic nature of cyanide. although aqueous solutions of cyanide degrade rapidly in sunlight, the less-toxic products, such as cyanates and thiocyanates, may persist for some years.
an assay is an investigative analytic procedure in laboratory medicine, pharmacology, environmental biology and molecular biology for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity the analyte . the analyte can be a drug, biochemical substance, or cell in an organism or organic sample.
unit cell: a = 5.417 å, z = 4 . an example of acid rock drainage caused by pyrite is the 2015 gold king mine waste water spill. dust explosions. pyrite oxidation is sufficiently exothermic that underground coal mines in high-sulfur coal seams have occasionally had serious problems with spontaneous combustion in the mined-out areas of the mine. the solution is to hermetically seal the mined .
supergene ores rich in sulfides may be concentrated using froth flotation. a typical concentrate of chalcocite can grade between 37% and 40% copper in sulfide, making them relatively cheap to smelt compared to chalcopyrite concentrates.
unit cell: a = 5.417 . an example of acid rock drainage caused by pyrite is the 2015 gold king mine waste water spill. . high-sulfur coal seams have occasionally had serious problems with spontaneous combustion in the mined-out areas of the mine. the solution is to hermetically seal the mined-out areas to exclude oxygen.
fluorite mining the main source of fluorine was estimated in 2003 to be a $550 million industry, extracting 4.5 million tons per year. most ores must be processed to concentrate the fluorite from other minerals by various methods of flotation separation. however, only about 1% of mined fluorite is ever converted to elemental fluorine.