HASHIMOTO , K., SUZUKI, Y. and CHIBA, S. Influence of Calcium and Magne sium Ions on the Sino-atrial Node Pacemaker Activity of the Canine Heart. Tohoku J. exp. Med., 1974, 113 (2), 187-196 •\ Using constant pressure perfusion technique of the canine sinus node artery, effects of changing concentrations of calcium and magnesium ions were investigated on the sino-atrial (SA) pacemaker activity. ...

We present a microfluidic platform for two-dimensional manipulation of water droplets immersed in bulk oil-based ferrofluid. Although non-magnetic, the droplets are exclusively controlled by magnetic fields, without any pressure-driven flow. The diphasic fluid layer is trapped in a submillimeter Hele-Shaw chamber that includes permalloy tracks on its substrate. An in-plane rotating magnetic fie...

● Canine visceral leishmaniasis is a severe systemic disease caused by the diphasic protozoan parasite Leishmania infantum in the Old World and L. chagasi in the New World. ● The geographical distribution of the disease is dependent on its insect vector, the sandfly Phlebotomus spp. in the Old World and Lutzomyia spp. in the New World. ● Common clinical signs are skin lesions, weight loss, anor...

The rationale for sustained release oral levodopa preparations is to deliver levodopa in the areas of maximal intestinal absorption in a slow and predictable way, leading to stable plasma levodopa levels and brain dopamine levels, therefore resulting in a lengthened duration of action. Sinemet CR is the prototype of such preparations, with demonstrated efficacy in decreasing periods of akinesia...

A 22-year-old girl was admitted to our cardiology institute with Permanent tachycardia in last 6 years for diagnostic assessment and therapy. Doppler echocardiography show structural of heart is normal, ECG revealed a varied resting rate from 120 to 140 bpm, 1:1 AV ratio and long RP interval. P wave morphology was negative on leads I, II, III, aVF, and V4 to V6, positive on lead V1, and diphasi...

The remarkable data by del Castillo and Morales (1967) on the eleetrophysiology of the Ascaris esophageal cell emphasize the usefulness of studies in primitive forms in which the record of evolutionary experimentation may still he preserved (Grundfest, 1959, 1963, 1964, 1966 a). They also present an interesting challenge to the ionic theory of bioelectrogenesis, requiring it to account for intr...

doppler ultrasound can provide important information about vascular problems through the analysis of blood flow wave-form. the purpose of this study was obtaining the normal images of color doppler and estimation of blood flow velocity parameters of femoral artery in rabbits. left and right femoral arteries of 8 healthy adult new zealand rabbits were evaluated. color and spectral doppler images...

The behavior of tethered polymers on gel/gel adhesion is studied with the single-chain mean-field ~SCMF! theory. It is shown that the gel surface structure, the gel/gel adhesion strength, the equilibrium gel/gel distance, and the detailed interface structures can be tailored by specifically designed tethered layers on gel surfaces. The SCMF theory allows to study the effect of various variables...

high purity lead titanate nanopowders in tetragonal form have been successfully prepared bycitric acid gel method using lead nitrate and tetra-n-butyl titanate as pb and ti sourcesrespectively and citric acid as complexing reagent. the precursors were calcined at varioustemperatures ranging from 450 °c to 600 °c for 2 h. fourier transform infraredspectroscopy (ft-ir), x-ray diffraction (xrd) an...