| spatial formula | A chemical formula in which the arrangement of the atoms or atomic groupings in space are indicated. Synonym: spatial formula. (05 Mar 2000) |
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| stereochemical formula | A chemical formula in which the arrangement of the atoms or atomic groupings in space are indicated. Synonym: spatial formula. (05 Mar 2000) |
| structural formula | A formula in which the connections of the atoms and groups of atoms, as well as their kind and number, are indicated. Synonym: constitutional formula, graphic formula. (05 Mar 2000) |
| Demoivre's formula | An obsolete formula for calculating life expectancy. (05 Mar 2000) |
| dental formula | <dentistry> A statement in tabular form of the number of each kind of teeth in the jaw; the dental formula for man is, for the deciduous teeth: for the permanent teeth: (05 Mar 2000) |
| Dreyer's formula | An obsolete formula indicating relationship between vital capacity and body surface area. (05 Mar 2000) |
| DuBois' formula | A formula for predicting a man's surface area from weight and height: A = 71.84W0.425 H0.725, where A = surface area in cm2, W = weight in kg, and H = height in cm. (05 Mar 2000) |
| official formula | A formula contained in the Pharmacopeia or the National Formulary. (05 Mar 2000) |
| electrical formula | A graphic representation by means of symbols of the reaction of a muscle to an electrical stimulus. (05 Mar 2000) |
| Toronto formula | For pulmonary artery banding, a technique that provides a general guide for the size of the band relative to the patient's weight. (05 Mar 2000) |
| empirical formula | In chemistry, a formula indicating the kind and number of atoms in the molecules of a substance, or its composition, but not the relation of the atoms to each other or the intimate structure of the molecule. Synonym: molecular formula. (05 Mar 2000) |
| Trapp-Haser formula | A formula to determine the number of grams of urinary solids per liter, obtained by multiplying 2.33 by the last two figures of the specific gravity of the urine. Synonym: Christison's formula, Trapp's formula, Trapp-Haser formula. (05 Mar 2000) |
| Trapp's formula | A formula to determine the number of grams of urinary solids per liter, obtained by multiplying 2.33 by the last two figures of the specific gravity of the urine. Synonym: Christison's formula, Trapp's formula, Trapp-Haser formula. (05 Mar 2000) |
| Jellinek formula | A method of estimating the prevalence of alcoholism in a nation's population, based on the assumption that a predictable proportion of persons addicted to alcohol die of cirrhosis of the liver. (05 Mar 2000) |
| Fischer projection formula | <biochemistry> Of sugars, representations, by projection, of cyclic sugars, or derivatives thereof, in which the carbon chain is depicted vertically. The lowest-numbered asymmetric carbon atom (C-1 in aldoses; C-2 in 2-ketoses, e.g., fructose) is drawn at the top, and the rest of the carbon atoms of the chain are drawn in sequence below the top carbon atom. For each carbon atom, depicted in projection as lying in the plane of the paper, the carbon-to-carbon bond(s), which actually point away from the viewer, are drawn as vertical lines. The left-hand and right-hand bonds of each carbon atom, which actually point toward the viewer, are, in projection, depicted as horizontal lines. The conventions for the Fischer formulas of cyclic sugars are as follows: 1) if the highest-numbered asymmetric carbon atom has its OH (or its replacement) lying to the right, as is the 2-OH of d-glyceraldehyde, the sugar has the d configuration; if the OH is to the left, the sugar has the l configuration. 2) On the anomeric carbon atom (C-1 in the aldoses; C-2 in the 2-ketoses), an OH or substituted OH that lies to the right, with the OH of the highest-numbered asymmetric carbon atom also to the right is defined to be a; if it is to the left, with the OH of the highest-numbered carbon atom still to the right, it is b; the reverse applies if the latter OH is to the left. 3) The orientation of a terminal CH2OH group in the aldoses carries no configurational significance, as it contains no asymmetric carbon atom. (05 Mar 2000) |