... and retrograde contraction waves in the intestine of developing zebrafish. At 4 d.p.f. (days post fertilisation), the nitric oxide synthase (NOS) inhibitor l -NAME (three boluses of 50–100 nl, 10 –3 mol l –1 ) increased the anterograde contraction wave frequency by 0.50±0.10 cycles min –1 . Subsequent...

... mol l −1 ; N =9) and 0±0.07 mN (10 −5 mol l −1 ; N =8). In the longitudinal preparations, NaNP reduced the force developed from 2.03±0.36 mN to 0.33±0.22 mN (10 −6 mol l −1 ; N =8) and 0.19±0.30 mN (10 −5 mol l −1 ; N= 8). The L-arginine analogue NG-nitro-L-arginine methyl ester (L-NAME; 3×10 −4 mol l...

... directions. Atropine reduced and methysergide abolished the oral contractions caused by electrical stimulation. Administration of the nitric oxide synthesis inhibitor L- N G -nitro-arginine methyl ester (L-NAME) abolished the anal relaxation caused by electrical stimulation and augmented the oral...