Å	Ångström (1 Å = 10−10 m)
ALR-1	Aldehyde Reductase
ALR-2	Aldose Reductase
B-factor	Debye-Waller factor
DAHC	diammonium hydrogen citrate
DMSO	Dimethyl sulfoxide
DTT	Dithiothreitol
EC	Enzyme Commission number
EDC	1-Ethyl-3-(3-dimethylaminopropyl)carbodiimid-hydrochlorid
ESI	Electrospray ionization
ESP	Electronic Surface Potential area
FC	Calculated structure amplitudes
FO	Observed structure amplitudes
g	Gram
G°	Gibbs free energy
H°	Enthalpy
H-bond	Hydrogen bond
HEPES	4-(2-Hydroxyethyl)-1-piperazine ethane sulfonic acid
HOBt	1-Hydroxybenzotriazol
HPLC	High Performance Liquid Chromatography
IC50	Half-maximum inhibitory concentration
IPTG	Isopropyl-β-d-thiogalactopyranosid
ITC	Isothermal titration calorimetry
K	Kelvin
k	Kilo
K a	Association constant
K D	Dissociation konstant
M	Molarity (mol/L)
min	Minute
MS	Mass spectroscopy
NADP+	Nicotinamide adenine dinucleotide phosphate
NADPH	Nicotinamide adenine dinucleotide phosphate, reduced
NMR	Nuclear magnetic resonance
PAGE	Polyacrylamide gel electrophoresis
PBS	Phosphate buffered saline
PEG	Polyethylen glycol
pH	Potentialis hydrogenii
pKa	Logarithmic acid dissociation constant
R-factor	Reliability factor
S°SD	EntropyStandard Deviation
SDS	Sodium dodecyl sulfate
T	Absolute temperature
TRIS	Tris(hydroxamethyl)aminomethane
X-ray	Röntgen radiation