| ANTISEPTIC | Substance to prevent growth of bacteria (10) |
| STUNT | Prevent growth of fruit up on top of tree (5) |
| CULTURE | Growth of bacteria for study (7) |
| SALMONELLA | Genus of bacteria occurring mainly in the gut, many species of which cause food poisoning (10) |
| STERILISED | Idle sister, somehow free of bacteria (10) |
| KRYPTONITE | Only substance to which Superman is vulnerable (10) |
| VACCINATES | Treats with a substance to produce immunity against a disease (10) |
| CULTURESHOCK | Growths of bacteria on wine may create unsettling change |
| BEACHBUGGY | Transport first of bacteria, all as they are? |
| BREAKBREAD | Interrupt study on source of bacteria and eat (5,5) |
| FOSSILFUEL | Coal remains substance to be burnt (6,4) |
| FLESHEDOUT | Gave substance to foetus held in an awkward position (7,3) |
| CANDYFLOSS | Sods can fly? Unlikely - there's little substance to it (5,5) |
| SHOTGLASS | Fired brittle substance to make something to drink out of |
| BW | The use of bacteria or viruses of toxins to destroy men and animals or food. |
| PLAQUE | Sticky biofilm on teeth composed of saliva and leftover food particles, colonised by up to a thousand species of bacteria (6) |
| ADSORB | Of a substance, to hold a thin film of liquid or gas |
| REACTANT | Substance to the left of the arrow in a chemical equation, with the product to the right (8) |
| DENSITY | The ratio of the mass of a substance to its volume (7) |
| HALFLIFE | What is the time taken for the radioactivity of a substance to fall to half its original value? (4-4) |
