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Hoffmann, Friedrich
(Encyclopedia) Hoffmann, FriedrichHoffmann, Friedrichfrēˈdrĭkh [key]Hoffmann, Friedrich hôfˈmän [key], 1660–1742, German physician. He taught and practiced at Halle from 1693. He studied and wrote on…isoprene
(Encyclopedia) isoprene or 2-methyl-1,3-butadieneisopreneīˈsəprēn, by&oomacr;ˌtədīˈēn [key], colorless liquid organic compound. It is a hydrocarbon, and is insoluble in water but soluble in many…phenolphthalein
(Encyclopedia) phenolphthaleinphenolphthaleinfēˈnôlthălˈēən [key], or 2,2-Bis(p-hydroxyphenyl) phthalide, C20H14O4, crystalline organic compound. It is used medicinally as a laxative and is widely…calcium carbonate
(Encyclopedia) calcium carbonate, CaCO3, white chemical compound that is the most common nonsiliceous mineral. It occurs in two crystal forms: calcite, which is hexagonal, and aragonite, which is…Wöhler, Friedrich
(Encyclopedia) Wöhler, FriedrichWöhler, Friedrichfrēˈdrĭkh vöˈlər [key], 1800–1882, German chemist. He studied under the German chemist Leopold Gmelin and J. J. Berzelius, a Swedish chemist, and in…eye
(Encyclopedia) CE5 Cross section of human eye eye, organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation.…herbicide
(Encyclopedia) herbicideherbicidehrˈbəsīdˌ [key], chemical compound that kills plants or inhibits their normal growth. A herbicide in a particular formulation and application can be described as…potassium nitrate
(Encyclopedia) potassium nitrate, chemical compound, KNO3, occurring as colorless, prismatic crystals or as a white powder; it is found pure in nature as the mineral saltpeter, or niter. (The name…Magnus, Heinrich Gustav
(Encyclopedia) Magnus, Heinrich GustavMagnus, Heinrich Gustavhīnˈrĭkh g&oobreve;sˈtäf mägˈn&oobreve;s [key], 1802–70, German chemist, physicist, and educator. In 1831 he became lecturer and…night blindness
(Encyclopedia) night blindness, inability to see normally in subdued light. It is usually a result of vitamin A deficiency. The rod cells, one of two light-sensitive areas of the retina of the eye,…Trending
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