Medical Definition of Fischer projection formula

1. 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)



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Lexicographical Neighbors of Fischer Projection Formula

First Viscount Nuffield
First Vision
First World
First World War
First of May
First of October Antifascist Resistance Group
Firth of Clyde
Firth of Forth
Firth of Lorn
Fischer
Fischer's sign
Fischer's slime mushroom
Fischer's symptom
Fischer-Tropsch process
Fischer indole synthesis
Fischer projection formula
Fishbed
Fishberg concentration test
Fisher
Fisher's syndrome
Fishman-Lerner unit
Fisk
Fissipedia
Fissurella apertura
Fissurellidae
Fistulariidae
Fistulina
Fistulina hepatica
Fistulinaceae
Fitchew

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