OBJECTIVE With respect to the equivocal value of the reverse perfusion pattern (RPP) in technetium-99m (Tc)-sestamibi myocardial perfusion imaging, a study was carried out to evaluate this pattern in association with the presence or absence of coronary artery disease (CAD) and other underlying factors, mainly the time of acquisition and the presence of intense visceral uptake. PATIENTS AND ME...

Baryon-baryon elastic scattering is considered in the independent scattering (Landshoff) mechanism. It is suggested that for scattering at moderate energies, direct and interchange quark channels contribute with equal color coefficients because the quark color is randomized by soft gluon exchange during the hadronization stage. With this assumption, it is shown that the ratio of cross sections ...

A report by the Royal College of Psychiatrists recommended avoiding atropine premedication during electroconvulsive therapy (ECT). We have examined the cardiovascular effects of ECT with or without atropine premedication. Consenting patients (n = 30) were allocated randomly before their third ECT session to receive atropine or no premedication. The rate pressure product (RPP) was recorded befor...

The routine use of veno-venous bypass during the anhepatic phase of orthotopic liver transplantation is controversial. Decreased shunt flows (1.5-3.0 litre min-1), as reported in the literature, may explain the lack of beneficial effects on outcome. We have studied the influence of bypass flows on caval pressure gradient (CPG) and renal perfusion pressure (RPP) in 45 patients undergoing orthoto...

Adrenomedullin (AM) is a potent depressor peptide whose vascular action is suggested to involve nitric oxide (NO) release. To explore the role of endogenous AM in vascular and renal function, we examined the effects of acetylcholine (ACh), AM, and AM receptor antagonists AM(22-52) and CGRP(8-37) on the renal perfusion pressure (RPP) of kidneys isolated from AM transgenic (TG)/heterozygote knock...

The mechanisms for the vascular actions of vasodilatory beta-blockers remain undetermined. For some kinds of beta-blockers, the involvement of nitric oxide (NO) has been suggested. We studied the effects of vasodilatory beta-blockers on renal perfusion pressure (RPP) and NO release in the rat kidney. Infusion of bopindolol, celiprolol, and nebivolol caused a dose-dependent reduction in RPP and ...

This paper introduces a new method to deal with the Undirected Rural Postman Problem (RPP), based on Genetic Algorithms. The RPP is a particular Arc Routing Problem which consists of determining a minimum cost circuit on a graph so that it is possible to traverse a given subset of required edges. The RPP is known to be an NP-hard problem and it has some interesting real-life applications. The a...

RNase P catalyzes the Mg(2)(+)-dependent 5'-maturation of precursor tRNAs. Biochemical studies on the bacterial holoenzyme, composed of one catalytic RNase P RNA (RPR) and one RNase P protein (RPP), have helped understand the pleiotropic roles (including substrate/Mg(2+) binding) by which a protein could facilitate RNA catalysis. As a model for uncovering the functional coordination among multi...

I ecently several investigators have reported that neutrophil functions were depressed or defective in .̂localized and generalized juvenile periodontitis. It has also been shown that patients with adult periodontitis exhibit no such abnormalities. Concerning rapidly progressing periodontitis, only a few reports have been provided. The purpose of the present study was to compare various neutrophi...