Gas mask e sewage treatment plant: o que têm em comum

1. Passo 1. Gas mask — evoluiu de — Respirator. Respiratory protection.
2. Passo 2. Respirator — evoluiu de — Surgical mask. A filtering mask.
3. Passo 3. Surgical mask — utiliza — Germ theory of disease. Protection against droplets.
4. Passo 4. Germ theory of disease — utiliza — Culture medium (agar). Koch’s postulates.
5. Passo 5. Culture medium (agar) — é utilizado em — Sewage treatment plant. Waste water is cleaned by activated sludge — bacteria.

Abrir Evothings