Four strains of Dunaliella were grown at 25°C and pH 8±0.5, with continous illumination at 200 W/m(2). Their maximum specific growth rates ranged from 0.093 day(-1) to 0.234 day(-1), nitrate yields from 3.0 to 7.8 g cells/g NaNO3 and lipid contents from 3% to 6% of the dry wt, with carotenes 50 to 80% of the lipids. Of the carotenes, β-carotene made up 7 to 19%; all-trans-β-carotene 32 to 52% and 9-cis-β-carotene 29 to 55%. There are, therefore, considerable intra-specific differences between strains of Dunaliella.
et al., and Hoggarth2 have reported syntheses of a number of aroyl-1-methyl-S-isothiosemicarbazides. These compounds, as well as the related aroylthiosemicarbazides, show antimicrobial activity. The preparation of the bioisosteric arylsulfonyl-1-methyl-S-isothiosemicarbazides ( I ) from the corresponding arylsulfonylthiosemicarbazides is given here as a further utilization of the latter compounds, whose preparation and evaluation were reported3 elsewhere. While the experi-(1) M.
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