PAES DE CARVALHO, ANTONIO, WALMOR CARLOS DE MELLO AND BRIAN F. HOFFMAN. Electrophysiological evidence for specialized Jiber types in rabbit atrium. Am. J. Physiol. I g6(3):483-488 I g59.-Intracellular microelectrodes have been used to study the site of origin and direction of spread of activity in the rabbit atrium. In this study a number of fiber groups have been found which possess specialize...

Transmembrane potentials of A-V nodal cells in isolated rabbit hearts were recorded while the route of entry of atrial activity into the A-V node was changed by stimulating the atrium at a high, constant rate on either the crista terminalis or the interatrial septum. Atrial activity arising from the interatrial septum provided a less effective input to the A-V node, as shown by the occurrence o...

The characteristics of aminoglycoside uptake in the inner ear were investigated in the isolated crista ampullaris. The organ was incubated with radiolabeled gentamicin, and the stable, nonexchangeable radioactivity was considered the intracellular pool of the drug. Gentamicin was transported against a concentration gradient, and the resulting tissue to medium ratios ranged from 1.4 to 18.6. Tra...

the genus onobrychis belongs to family fabaceae and has about 130 species throughout the world. onobrychis sect. hymenobrychis with nearly 14 species in iran is one of the important sections of the genus. the chromosome number and meiotic behaviour were studied in two populations of onobrychis chorassanica belonging to this section native to iran. this report is the first cytogenetic analysis o...

On the basis of MEM spectrum analysis, the main planetary scale ̄uctuations formed in the lower ionosphere are studied over a period of 3±25 days during the CRISTA campaign (October-November 1994). Three dominant period bands are found: 3±5, 6±8 and 15±23 (mainly 16±18) days. For 7±8 and 16±18 day ̄uctuations, propagation was eastward with wave numbers K = 3 and K = 1, respectively. The magnitud...

Sphenopalatine artery ligation (SPL) is a surgical remedy for severe epistaxis. This procedure requires extensive knowledge of the various anatomical variants. Its topographical anatomy varies and reliable landmark such as the crista ethmoidalis may be absent. These variations are crucial and they dictate the outcome of the surgery. We present a peculiar case of a postero-superiorly located var...