Abstract
Fat accumulation in Nitzschia palea Kutz. starts perceptibly at the end of the exponential phase of growth and reaches a maximum during the stationary phase of growth when the whole cell is filled with fat. Filtrates from old cultures enhanced fat synthesis probably by the production of an autotoxin which inhibits cell growth but at the same time favours fat synthesis. The presence of an inhibitory autotoxin has not been proved but indirect evidence suggests its presence. The nitrogen content of the culture medium also influences the amount of fat formed, more fat being accumulated in nitrogen-deficient media than in media provided with adequate nitrate supply. The optimum temperature for the growth of N. palea was found to be about 30 °C while that for fat synthesis was around 35 °C. Below 15 °C and above 40 °C, fat synthesis was drastically reduced. Blue and red light independently favoured fat synthesis whereas a combination of both did not. This is probably due to the selective influence of these wavelengths on the production of fat precursors or
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