Table 4.

The ambient ammonia concentration and 15N-ammonia in the tail compartment when the tail of P. schlosseri was exposed for 6 h to 5, 10 or 20 mmol l-115NH4Cl in the head compartment

Tail compartment
Condition
Head compartment
[Ambient ammonia] (mmol l-1)
15N-ammonia (% atom excess)
pH[NH4Cl] (mmol l-1)0 h6 h0 h6 h
7.0 5 0.04 0.16 0 73 
 10 0.04 0.18 0 83 
 20 0.04 0.64 0 69 
8.0 5 ND 0.06 0 54 
 10 ND 0.09 0 18 
 20 ND 1.17 0 45 
Tail compartment
Condition
Head compartment
[Ambient ammonia] (mmol l-1)
15N-ammonia (% atom excess)
pH[NH4Cl] (mmol l-1)0 h6 h0 h6 h
7.0 5 0.04 0.16 0 73 
 10 0.04 0.18 0 83 
 20 0.04 0.64 0 69 
8.0 5 ND 0.06 0 54 
 10 ND 0.09 0 18 
 20 ND 1.17 0 45 

ND, not detectable.

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