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| micro element; micromineral; oligo-element; trace element; trace mineral | |||
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| trace element; trace elements; trace element Any of various chemical elements that occur in very small amounts in organisms and are essential for many physiological and biochemical processes | |||
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| micro elements; minor elements; trace elements | |||
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element-trace : 19 do fraz, 11 tematyki |
| Chemia | 1 |
| Geologia | 1 |
| Medycyna | 1 |
| Nauka o ziemi | 1 |
| Ochrona środowiska | 2 |
| Przemysł | 1 |
| Roboty drogowe | 1 |
| Technologia informacyjna | 1 |
| Węgiel | 1 |
| Włókiennictwo | 2 |
| Zasoby naturalne i ochrona dzikiej przyrody | 7 |