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- W2024890767 abstract "Abstract Euglena gracilis was grown on sewage or abattoir waste in either 8-litre tray cultures at 25–30° or in 300–600 litre ponds with swine manure digest (diluted 1:100) at pH 4·0 in a glasshouse. At this pH, bacteria, protozoa and chlorophyte contamination was minimal and Euglena grew in almost a monoculture. At pH 7·0, Euglena grew initially, but eventually succumbed to bacterial invasion and was succeeded by chlorophytes. The addition of 1·0–5·0 m M acetate at pH 4·0 enhanced the growth of Euglena by inducing the development of fungi which were transient, but beneficial, by producing fermentation products and growth substances. Photo-organotrophy was predominant in the initial states under anaerobic conditions, but was also accompanied by photosynthesis at rates up to 125 μmoles O 2 mg −1 chlorophyll h −1 . The stationary phase of growth was attained after 4–6 days. Neither additions of acetate nor of other low molecular weight compounds were capable of inducing sufficient growth of Euglena to completely deplete the media of NH 3 N and orthophosphate (PO 4 P). Growth was also paralysed by the development of an Amoeba at pH 4·0. The addition of whey, pH 4·2, in a dilution ratio of 1:25–1:100, was a key factor in maximising the growth of Euglena up to 2–3000 cells per μlitre concomitant with the depletion of NH 3 N and PO 4 P to almost zero levels. Whey also suppressed the development of Amoeba and provided nutrients and growth substances, including vitamins. Harvesting from ponds was made easier by the phototactic responses of Euglena which rose to the surface on cloudy days. The dry matter of these cells contained 60–70% protein, 15–20% lipid and 15–20% carbohydrate. The system could be useful for purifying and reclaiming wastes by Euglena , especially for the dairy and meat-packing industries, and in increasing the organic matter of lateritic soils, provided that wastes were readily accessible." @default.
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- W2024890767 date "1980-11-01" @default.
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- W2024890767 title "Purification and reclamation of farm and urban wastes by Euglena Gracilis: Photosynthetic capacity, effect of pH, temperature, acetate and whey" @default.
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- W2024890767 doi "https://doi.org/10.1016/0143-1471(80)90045-8" @default.
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