. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHOSPHORUS UPTAKE BY PHAEODACTYLUM 139 all cultures the phosphate was not significantly different from zero after 13 clays. The phosphorus content of the cellular fraction (Fig. IB) was the inverse of the phosphate content. The apparent increase in total phosphorus concentration at the end of the experiment is consistent with the usual rate of evaporation of water from media. The difference between total dissolved phosphorus and dissolved phosphate, frequently referred to as dissolved organic phosphorus, was never a signific
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHOSPHORUS UPTAKE BY PHAEODACTYLUM 139 all cultures the phosphate was not significantly different from zero after 13 clays. The phosphorus content of the cellular fraction (Fig. IB) was the inverse of the phosphate content. The apparent increase in total phosphorus concentration at the end of the experiment is consistent with the usual rate of evaporation of water from media. The difference between total dissolved phosphorus and dissolved phosphate, frequently referred to as dissolved organic phosphorus, was never a significant amount in A or B, but reached a maximum of about 8 ju,M in flasks C and D at 6 and 12 hours, respectively. In all cultures it was not significantly different from zero after the sixth day. The quantity of phosphorus per cell, shown in Figure 2, reached a maximum in two to 12 hours, the peak occurring later in the flasks with higher initial phosphate. 10 20 30 HOURS 40 6 8 10 12 14 16 18 20 DAYS FIGURE 2. Phosphorus concentration of Phaeodactylum as a function of time after inoculation into media with varying initial phosphate concentrations as in Figure 1. concentrations. The maximum concentration per cell in flasks A, B, and C was nearly a function of the initial phosphate concentration in the medium because these cultures were able to remove almost all of the phosphate before appreciable cell multiplication occurred. The number of cells in flask D, however, nearly doubled in the first 24 hours, at which time about half of the phosphate still remained in solution. These cells reached their peak concentration in 12 to 24 hours. The later decreases in phosphate per cell resulted from continuing cell multiplication. The increase from 4 to 66 X 10~15 mole/cell (flasks C and D), a factor of 16, in 12 hours is remarkable. Part of the increase per cell may be attributed to cell en- largement prior to division, but much of the increase must represent a greater con- centration of p
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