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Biomass or product formed per gram of substrate used.
Note
Y = ΔX / ΔS = (12 − 2) / (40 − 10) = 0.333 g per g substrate.
Reference: Fermentation stoichiometry. Always follow your approved SOP and current pharmacopoeia.
Y = ΔX / ΔS
Biomass 2 → 12 g/L, glucose 40 → 10 g/L → Y = 0.33 g/g
Use the same units for both; maintenance energy and product formation change apparent yields.