Figure 2. Transmission electron micrograph of a cross section of Fragilana 

 capucina . Numerous small polyphosphate bodies (PP) are present in the 

 vacuole (V). Other cytoplasmic organelles are normal. Large chloro- 

 plasts (c) are positioned under the valve face of the frustule (F). 

 Golgi apparatus (G) appears somewhat disorganized because the inter- 

 calary bands (B) are being formed prior to next cell division, (flagni- 

 fication X29,000). 



Figure 3. X-ray spectrum of a polyphosphate body contained in the vacuole of 

 Fragilaria capucina . The labelled peaks are P (Ka) and Pb (Ma, La). A 

 minor calcium peak (Ka 3.69 Kev) is also present. Unlabel! ed peaks are 

 CI (Ka 2.62 Kev), a component of the epoxy embedding medium, and Cu (Ka 

 8.04, 8.02 Kev; KB 8.90 Kev), which originates from the grid. 



177 



