Disposition of norepinephrine and epinephrine in jejunum of WLH chicken.

Disposition of (-)-norepinephrine and (-)-epinephrine in jejunum of WLH chicken was studied using oil-immersion technique. The relative rate of different routes of disposition of catecholamines was in the following order: for (-)-NE COMT greater than or equal to MAO greater than or equal to U2 greater than U1, for (-)-Epi U2 greater than or equal to COMT greater than MAO greater than U1. The role of enzymatic degradation is almost equal to that of uptake processes for (-)-Epi, but it was greater for (-)-NE.

Neurophysiological alterations following fluvalinate administration in mice.

Median lethal dose (LD50) of fluvalinate (Marvik 25EC) was 105 (94.6-116.5 mg/kg, ip) in albino mice. Gross observable signs were dose dependent and indicative of central and peripheral nervous system stimulation. Fluvalinate, at 10.5 and 21.0 mg/kg, ip doses in mice, facilitated maximal electroshock seizures, reduced reaction time in analgesic test and enhanced duration of ether anaesthesia. Acute and subacute (7 days) treatment at lower and higher doses enhanced pentobarbitone sleeping time. Acute and subacute treatment (7 days) with phenobarbitone (50 mg/kg, ip) prior to fluvalinate enhanced toxicity of fluvalinate.