Effect of naphthalene and aqueous crude oil extracts on the green flagellate Chlamydomonas angulosa. III. Changes in cellular composition

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Abstract
Changes in major cellular composition during growth have been determined for normal Chlamydomonas angulosa batch cultures, napthalene-treated cultures, and cultures treated with aqueous crude oil extracts.During the exponential phase of normal growth, the cellular content of all major constituents varied in a rhythmic pattern in response to the growth rate of the cultures. The extent of initial compositional changes depended on whether the cell inoculum originated from exponential or stationary phase cultures. When cultures reached stationary phase, increases in all major constituents were observed.When C. angulosa was incubated in a closed system with 50% saturated naphthalene medium. pigments and total cellular carbon remained constant, total protein decreased, whereas carbohydrate and lipids increased. Immediate recovery was not observed upon transfer to an open system unless the cells were resuspended in fresh medium.When C. angulosa was incubated in a closed system with aqueous crude oil extract, cellular carbohydrate remained constant, total protein decreased significantly, whereas pigments, cellular total carbon, and lipids increased. On transferring to an open system, these cells recovered more readily as compared with naphthalene-treated cells.

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