Forager bees pack moistened pollen pellets into a comb cell, add nectar, glandular enzymes and saliva, then cap it with a thin layer of honey. This seals out oxygen and creates an anaerobic, sugar-rich, mildly acidic micro-vat. Lactic acid bacteria (mainly Lactobacillus / Fructobacillus species) already present on the pollen and in the hive multiply rapidly and ferment sugars into lactic acid, which drops the pH and preserves the mass while breaking down the tough pollen exine wall — releasing amino acids and B-vitamins that were otherwise locked away.
The simulation drives fermentation rate with an Arrhenius/Q10-style temperature dependence, bacterial growth with the logistic equation, and acid buildup and pollen wall breakdown with first-order kinetics toward their fermented end-state.
k(T) = k0 · Q10^((T-35)/10) Q10 ≈ 2.2, k0 = 0.28 /day
pH(t) = pH_end + (pH0-pH_end)·e^(-k·t) pH0=5.6 → pH_end≈4.0
LA(t) = LA_max·(1-e^(-k·t)) LA_max ≈ 2.4 %
N(t) = K / (1+((K-N0)/N0)·e^(-r·t)) logistic LAB growth, r=1.3k
Prot(t)=P0+(Pmax-P0)·(1-e^(-k·t)) digestible protein, 18%→28%
- Days fermenting — scrubs time inside the sealed cell; drag it or let it auto-play.
- Hive temperature — brood-nest heat sets the rate constant k(T); cooler cells ferment slower.
- Auto-ferment — advances the day slider in real time (1 s ≈ 1 day).
- Fresh pollen / Cutaway — resets the cell to raw pollen, or toggles the wax wall transparency.
Beekeepers recognise finished bee bread by its darker, glossy, compacted look and sour smell — the same visible and chemical shift modelled here, which is why it is prized as a more digestible, vitamin-rich food than raw pollen.