# Microbiology - Stage 4 (technology)

internal name `microbiology-mk04` · tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/tech/microbiology-mk04/

## Cost

1200 units of (1 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 2 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 3 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 6 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 10 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 20 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 30 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 6 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 300 s each.

## Requires (2)

- [Microbiology - Stage 3](https://factorio.kalzumeus.com/tech/microbiology-mk03.md)
- [Production science pack](https://factorio.kalzumeus.com/tech/production-science-pack.md)

## Leads to (2)

- [Biopolymer](https://factorio.kalzumeus.com/tech/biopolymer.md)
- [Genetics - Stage 5](https://factorio.kalzumeus.com/tech/genetics-mk05.md)

## Unlocks (2 recipes)

### Knallgas-bacteria (`bacteria-2`)

- 8 s · tier 7 · productivity modules allowed
- Ingredients: 5 × [Bone meal](https://factorio.kalzumeus.com/item/bonemeal.md), 100 × [Oleochemicals](https://factorio.kalzumeus.com/fluid/oleochemicals.md), 8 × [Ground sample](https://factorio.kalzumeus.com/item/ground-sample01.md), 3 × [Petri dish](https://factorio.kalzumeus.com/item/petri-dish.md), 2 × [Nexelit plate](https://factorio.kalzumeus.com/item/nexelit-plate.md), 5 × [Glassware](https://factorio.kalzumeus.com/item/flask.md), 5 × [Chitin](https://factorio.kalzumeus.com/item/chitin.md)
- Results: 100 × [Knallgas-bacteria](https://factorio.kalzumeus.com/fluid/bacteria-2.md)
- Made in: Gene lab MK 01, Gene lab MK 02, Gene lab MK 03, Gene lab MK 04
- Unlocked by: [Microbiology - Stage 4](https://factorio.kalzumeus.com/tech/microbiology-mk04.md)

### Phytoplankton (`phytoplankton-2`)

- 5 s · tier 7
- Ingredients: 100 × [Flue gas](https://factorio.kalzumeus.com/fluid/flue-gas.md), 500 × [Water](https://factorio.kalzumeus.com/fluid/water.md), 3 × [Fertilizer](https://factorio.kalzumeus.com/item/fertilizer.md)
- Results: 20 × [Phytoplankton](https://factorio.kalzumeus.com/fluid/phytoplankton.md)
- Made in: Phytoplankton farm MK 01, Phytoplankton farm MK 02, Phytoplankton farm MK 03, Phytoplankton farm MK 04
- Unlocked by: [Microbiology - Stage 4](https://factorio.kalzumeus.com/tech/microbiology-mk04.md)