Also known as: ld.
LD has various meanings in the Chemistry category. Discover the full forms, definitions, and usage contexts of LD in Chemistry.
Chemical symbol Pb. Very soft, bluish-white metal; highly malleable and ductile; poor conductor of electricity, but good noise-dampening material; resistant to corrosion and radiation. Obtained from galena ore. Major end-use is storage batteries, which accounts for 60% of world lead consumption. Also used in ammunition, but has declining use in paints, plumbing equipment and cable coverings because of its toxicity.
ChemistryA lethal dose is an indication of the lethality of a given substance or type of radiation. Because resistance varies from one individual to another, the 'lethal dose' represents a dose (usually recorded as dose per kilogram of subject body weight) at which a given percentage of subjects will die. The LD may be based on the standard person concept, a theoretical individual that has perfectly "normal" characteristics, and thus not apply to all sub-populations.
ChemistryA syrupy, water-soluble liquid, C3H6O3, produced by anaerobic glucose metabolism in muscles, by certain bacteria, and by synthetic methods. Lactic acid is present in fermented foods such as yogurt and sauerkraut and is used in foods and beverages as a flavoring and preservative, in dyeing and textile printing, and in pharmaceuticals.
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