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1. An act that requires use of resources or time. In Program Evaluation and Review Technique (PERT), an activity is represented by an arrow on a PERT chart.

2. In investing, the amount of a security's relative trading volume; that is, the amount of money flowing into and out of a security in trading. A high amount of activity means that many shares of the security are being bought and sold at a high rate, while a low level of activity indicates the opposite.


The amount of relative trading volume in a security.
References in periodicals archive ?
Using reagent-grade enzymes, we evaluated if enzyme activity determined with the api ZYM kit could be quantified.
One portion of each soil sample was used immediately to measure soil enzyme activity and microbial biomass, and then stored at 4[degrees]C.
The effect of pH on enzyme activity was investigated at various pH levels ranging from a pH of 3.
1] for 19 consecutive years increased the denitrifying enzyme activity by up to 200% for up to three months following the pig slurry application (ROCHETTE et al.
The Pompe and Fabry enzyme activity assays described previously used CHAPS and sodium taurocholate, respectively (2).
Cluster analysis was also carried out to record correlation between different species on the basis of presence of enzyme activity and represented in the form of dendrogram.
The study proved that systemically available metabolites of pomegranate juice are effective inhibitors of CYP1B1 enzyme activity and expression and could lower the incidence of prostate cancer initiation and sustenance.
With respect to COMT, according to the researchers, those with lower enzyme activity within this polymorphism had a lower placebo response.
While nattokinase treatment decreased plasma renin activity to some extent, it had no effect on angiotensin-converting enzyme activity.
The method comprises bringing together the reagent, the protease, the enzyme acceptor and substrate for the indicator enzyme and measuring the indicator enzyme activity as a measure of the protease activity.
Part of the soil enzyme activity is associated with living microorganisms and is designated the intracellular activity, whereas other parts are associated with abiotic components, which are truly extracellular (Burns 1982; Li and Sarah 2003a).
The placenta of malaria infected animals showed a patchy distribution of the enzyme activity (Fig.