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KAP Cris: Sample site for Winogradsky column material
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KAP Cris: Winogradsky column filled
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KAP Cris: The Winogradsky column inside
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KAP Cris: Egg yolk going into the Winogradsky mix
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KAP Cris: Additional ingredients for the Winogradsky column
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KAP Cris: A one-liter pyrex cylinder