av-node modification by catheter rf energy delivery is treatment of choice in the symptomatic patients with avnrt. this study included 30 patients with avnrt (19 women, 11 men). we did slow pathway ablation in 29 cases successfully. maximum effective energy delivery was 40 watts for 40 msec. 1:1 av conduction increased from 290±40 msec before ablation to 340±65 msec after ablation. also av-node...

We studied relaxation during rapid rewarming of rabbit ventricular muscles that had been activated by rapid cooling. Rewarming from 1 degree to 30 degrees C (in less than 0.5 second) activates mechanisms that contribute to the reduction of intracellular calcium concentration and thus relaxation (e.g., sarcoplasmic reticulum [SR] calcium pump and sarcolemmal Na-Ca exchange and calcium pump). Rap...

2. These records principally refer to cropmarks and finds. The only upstanding remains are a henge monument at Gunthorpe 1 and some of the 6 earthworks included amongst the 24 and 14 sites which are respectively categorised as round mounds and round barrows. Evidence about landscape comes primarily from palaeoenvironmental data within deposits in river channels and alluvium which ranges from po...

1. Voltage-sensitive membrane-bound dyes and a matrix of 100 photodetectors were used to detect the spread of evoked electrical activity at the CA1 region of rat hippocampus slices. A display processor was designed in order to visualize the spread of electrical activity in slow motion.2. The stimulation of the Schaffer collateral-commissural path in the stratum radiatum evoked short latency (2-...

This paper is concerned with investigation of vertical impedance function of a surface rigid circular foundation resting on a semi-infinite transversely isotropic alluvium. To this end, the equations of motion in cylindrical coordinate system, which because of axissymmetry are two coupled equations, are converted into one partial differential equation using a method of potential function. The g...

In many neurons, N-type Ca2+ channels are a major Ca2+ entry pathway and strongly influence neurotransmitter release. We carried out cell-attached patch recordings (110 mM Ba2+ as charge carrier) to characterize the rapid opening and closing kinetics of N-type Ca2+ channel gating in frog sympathetic neurons. Single channels display at least three distinct patterns of gating, characterized as lo...

We recorded impulses in afferent nerve fibers innervating two kinds of phasic electroreceptors in a mormyrid fish. We used an isolated preparation of skin, receptors, and sensory nerves to estimate synaptic delays, and to change solution in contact with the receptor-nerve synapse. The minimum delays between stimuli and sensory nerve responses, which must be slightly larger than synaptic delays,...