Fig. 6

(a) Effect of various concentrations of serotonin (0.05–0.4 mM) on blood platelet MAO-A activity in control and long-term [A 15 and B 30 consecutive days] patchouli oil-exposed rats. Results are expressed as mean ± SEM of 4–6 separate observations. Each observation was made from a single rat. The filled circle represents control, the filled triangle represents five drops of patchouli oil of 1-h exposure for 15 consecutive days, the filled diamond represents two drops of patchouli oil of 1-h exposure for 30 consecutive days. Other details are the same as described in the legend of Fig. 5. (b) Lineweaver–Burk plots of blood platelet MAO-A activity of control and long-term patchouli oil-exposed rats. Lineweaver–Burk plots were drawn from the progress curves with varying substrate concentration as presented in a of (A) and (B) respectively