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Samenvatting M.O. in de omgeving
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Micro-organismen in de omgeving
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7 Micro-organismen in de omgeving1 Algemeenheden
Recyclering – elementenkringlopen
Afbraak afval (mineralisatie)
Maar mogelijk dankzij
• Grote verscheidenheid
• Groot aantal
Primaire rol: hun eigen standhouding trachten te verzekeren.
1.1 Nuttige micro-organismen
• Deze die in de kringloop der elementen bepaalde omzettingen verrichten
• Deze die tussenkomen bij bv. Milieubeheer
• Deze gebruikt inde levensmiddelenindustrie (bier, wijn, brood bereidingen)
1.2 Schadelijke micro-organismen
• Bederfveroorzakende micro-organismen
Ontwikkeling op producten geschikt voor consumptie
• Pathogene micro-organismen die infecties veroorzaken
• Toxinevormende micro-organismen
Toxische stoffen in levensmiddelen produceren, zonder dat dit waarneembaar is
2 Kringlopen van elementen
2.1 Koolstofcyclus
CO2 wordt bij FS omgezet in biomassa. Het ontstane organisch materiaal zal deels weer als CO2
vrijkomen, via sterfte, of via voedselketens.
Fotosynthese
CO2 Organisch materiaal
Respiratie
Afbraak
2.2 stikstofcyclus
Organisch N → R-NH2
N2
R-NH2 R-NH2
(plant) (dier)
AFBRAAK
NO3- NO2- NH3
1
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