Administrative Role Based Access Control (ARBAC) models deal with how to manage user-role assignments (URA), permission-role assignments (PRA), and rolerole assignments (RRA). A wide-variety of approaches have been proposed in the literature for URA, PRA and RRA. In this paper, we propose attribute-based administrative models that unify many prior approaches for URA and PRA. The motivating fact...

Hypertensive patients with low-baseline plasma renin activity (PRA) are known to respond best to natriuretic drugs, and those with high PRA respond best to renin-angiotensin system (RAS) blockade. However, there has been recent speculation that blood pressure (BP)-lowering responses to the renin inhibitor, aliskiren, might also be blunted in some patients with medium-to-high baseline PRA. It ha...

In 37 patients with coarctation of the aorta, arterial blood pressure and ambulant plasma renin activity (PRA) were determined before and, in 15 patients, after surgical correction. The systolic blood pressure was raised in all the cases and the diastolic pressure was raised in 30 patients. Ambulant PRA was increased in 11 patients when compared with normal subjects of similar age. Twelve of th...

Changes in the cell cytoskeleton occur in cell transformation and recent data suggest the involvement of ovarian hormones, which are implicated in cancer development and progression. In human breast and endometrial tumors, there is disrupted expression of progesterone receptor (PR) isoforms and predominance of one isoform, usually PRA. PRA predominance is an early event in carcinogenesis, and i...

Prorenin is an inactive form of the aspartic protease renin. Like pepsinogen, it is activated at low pH. The kinetics of acid activation of prorenin were studied in human amniotic fluid and plasma and in preparations of purified prorenin isolated from amniotic fluid and plasma. Conversion of prorenin (pR) into active renin (R) appeared to be a two-step process involving the generation of an int...

It is well–known (due to C. Parsons) that the extension of primitive recursive arithmetic PRA by first–order predicate logic and the rule of Π02–induction Π02–IR is Π 0 2–conservative over PRA. We show that this is no longer true in the presence of function quantifiers and quantifier–free choice for numbers AC– qf. More precisely we show that T :=PRA + Π02–IR+AC –qf proves the totality of the A...

Objectives Protosappanin A (PrA) is an effective and major ingredient of Caesalpinia sappan L. The current study was aimed to explore the effect of PrA on atherosclerosis (AS). Materials and Methods Firstly, the experimental model of AS was established in rabbits by two-month feeding of high fat diet. Then, the rabbits were randomly divided into five groups and treated with continuous high li...

This research examines the conduct and consequences of the use of participatory rural appraisal techniques in four rural development projects in The Gambia. The research included a review of literature on PRA and the identification of a series of key themes that would allow an assessment of its utility. Fieldwork in The Gambia included reviews of project documentation, key informant interviews,...