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Ammonites of Europe
Ammonites of Europe describes how Jurassic ammonites define stratigraphic zones in Europe, where the modern zonal method was built and several international stage boundaries, or GSSPs, are formally anchored.
Ammonites of North America
Ammonites of North America are the fossil ammonoids, best known from the Late Cretaceous Western Interior Seaway, where 28 range zones in the Pierre Shale date the rocks.
Ammonites of South America
Ammonites of South America are fossil ammonoid cephalopods preserved in Jurassic and Cretaceous marine rocks of Argentina, Chile, Peru, and Colombia, key to dating oil-bearing strata.
Ammonites of the British Isles
Ammonites of the British Isles are fossil coiled cephalopods preserved in the Jurassic and Cretaceous marine rocks of Great Britain and Ireland, including the Kimmeridge Clay of Dorset.
Ammonitida
Ammonitida, the true ammonites, is an order of extinct Jurassic-Cretaceous shelled cephalopods within Ammonoidea, defined by complex ammonitic sutures, planispiral aragonite shells, and extinction at the end of the Cretaceous 66 million years ago.
Ammonium
Ammonium, also known as the ammonium ion or azanium, is the positively charged NH4+ ion formed when ammonia accepts a proton, and a key nitrogen source in fertilizers.
Ammonium acetate
Ammonium acetate (CH3COONH4), also called ammonium ethanoate, is the ammonium salt of acetic acid, a white crystalline solid used as a volatile buffer in LC-MS.
Ammonium bicarbonate
Ammonium bicarbonate (NH4HCO3), also known as ammonium hydrogen carbonate or baker's ammonia, is an inorganic salt that decomposes on heating and leavens crackers and cookies.
Ammonium bituminosulfonate
Ammonium bituminosulfonate, known pharmacologically as ichthammol and historically as Ichthyol, is a blackish-brown sulfonated shale oil used topically against inflammatory skin disorders since the 1880s.
Ammonium Bromide
Ammonium bromide (NH₄Br, CAS 12124-97-9) is an inorganic ammonium salt of odorless white, water-soluble crystals that slowly yellow in air, used chiefly in photography, wood fireproofing, lithography, and pharmaceuticals.
Ammonium carbonate
Ammonium carbonate, also known as baker's ammonia or hartshorn salt, is a white, ammonia-smelling salt long used as a leavening agent in cookies and crackers before baking powder.
Ammonium chloride
Ammonium chloride (NH4Cl), also known as sal ammoniac, is an inorganic salt of ammonia and hydrochloric acid used as a fertilizer, in dry-cell batteries, and as a food additive.
Ammonium fluoride
Ammonium fluoride (NH₄F) is the ammonium salt of hydrofluoric acid, a colorless crystalline solid used in etching and frosting glass, wood preservation, and semiconductor wet etching.
Ammonium formate
Ammonium formate, the ammonium salt of formic acid, is a colorless deliquescent crystalline solid used as an ammonia source, a hydrogen-transfer reagent, and a volatile buffer for LC-MS.
Ammonium hydroxyde
Ammonium hydroxyde (ammonium hydroxide, aqua ammonia, aqueous ammonia, E 527) is ammonia dissolved in water, NH4OH, CAS 1336-21-6; a weakly basic corrosive solution used as fertilizer, cleaner, water-treatment chloramine source, and food additive.
Ammonium iron(II) sulfate
Ammonium iron(II) sulfate, also called Mohr's salt or ferrous ammonium sulfate, is a double sulfate of iron(II) and ammonium, more air-stable than iron(II) sulfate and the standard Fe²⁺ source for redox titrations.
Ammonium metavanadate
Ammonium metavanadate (NH₄VO₃) is the ammonium salt of metavanadic acid, a white crystalline solid that is the usual form in which vanadium is precipitated and purified industrially.
Ammonium molybdate
Ammonium molybdate is the common name for a family of ammonium salts of molybdic acid, chiefly ammonium heptamolybdate, a reagent used in phosphate testing and catalyst production.
Ammonium nitrate
Ammonium nitrate, also written NH4NO3, is an inorganic salt produced in large volumes as a nitrogen fertilizer and, mixed with fuel oil, as a blasting explosive.
Ammonium perchlorate
Ammonium perchlorate is a white crystalline inorganic salt, NH₄ClO₄, used as the dominant oxidizer in composite solid rocket propellants and classified as a strong oxidizer that can explode at fine particle sizes.
Ammonium perchlorate composite propellant
Ammonium perchlorate composite propellant (APCP) is a solid rocket propellant combining ammonium perchlorate oxidizer, powdered aluminum, and a polymer binder, powering military missiles and launch boosters for over five decades.
Ammonium persulfate
Ammonium persulfate, also called ammonium peroxydisulfate, is the ammonium salt of peroxydisulfuric acid, a white crystalline solid and strong oxidizer used as a polymerization initiator and PCB copper etchant.
Ammonium phosphate
Ammonium phosphate is a family of salts made from phosphoric acid and ammonia, chiefly MAP and DAP, used mainly as phosphorus fertilizer and in fire extinguishers.
Ammonium phosphatide
Ammonium phosphatide (E 442, emulsifier YN), mixed ammonium salts of phosphorylated glycerides from vegetable fats; a neutral-tasting lecithin substitute that lowers chocolate viscosity, EU-limited to 10,000 mg/kg in cocoa products, ADI 30 mg/kg bw/day.
Ammonium polyphosphate
Ammonium polyphosphate is an inorganic salt of polyphosphoric acid and ammonia, used mainly as a halogen-free flame retardant and also as a fertilizer and food additive.
Ammonium sulfate
Ammonium sulfate is an inorganic sulfate salt formed from ammonia and sulfuric acid, a white solid produced on a large scale as fertilizer, supplying about 21% nitrogen and 24% sulfur.
Ammonium sulfate precipitation
Ammonium sulfate precipitation is an inexpensive protein purification method that separates proteins by solubility, precipitating successive fractions as salt rises; it is a crude first step before chromatography and does not denature proteins.
Ammonium sulphamate
Ammonium sulphamate (AMS, CAS 7773-06-0), the ammonium salt of sulfamic acid, is a nonselective, slightly toxic herbicide once sold as Ammate for brush, poison ivy, and stump treatment; EU approval withdrawn in 2006.
Ammonium sulphate
Ammonium sulphate ((NH4)2SO4, mascagnite) is an inorganic salt used mainly as a 21-0-0-24S nitrogen-sulfur fertilizer, historically the first N fertilizer (1840), now mostly a caprolactam byproduct, also a herbicide spray water conditioner.
Ammonium tartrate
Ammonium tartrate, the diammonium salt of L-(+)-tartaric acid with formula C₄H₁₂N₂O₆, is a white, water-soluble crystalline solid used to manufacture fabrics, in medicine, and as an EPR radiation dosimetry material.