activity

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activity

1. the number of disintegrations of a radioactive substance in a given unit of time, usually expressed in curies or disintegrations per second
2. 
a. the capacity of a substance to undergo chemical change
b. the effective concentration of a substance in a chemical system. The absolute activity of a substance B, λB, is defined as exp (μBRT) where μB is the chemical potential

activity

[‚ak′tiv·əd·ē]
(computer science)
The use or modification of information contained in a file.
(nuclear physics)
The intensity of a radioactive source. Also known as radioactivity.
(physical chemistry)
A thermodynamic function that correlates changes in the chemical potential with changes in experimentally measurable quantities, such as concentrations or partial pressures, through relations formally equivalent to those for ideal systems.
(systems engineering)
The representation in a PERT or critical-path-method network of a task that takes up both time and resources and whose performance is necessary for the system to move from one event to the next.

activity

In CPM terminology, a task or item of work that must be performed in order to complete a project.
References in periodicals archive ?
Dehydrogenase enzyme activity was measured using the reduction of 2,3,5-triphenyltetrazolium chloride (TTC) to triphenylformazon (TPF).
Effect of pH on the enzyme activity was determined under standard assay conditions using buffers: Sodium acetate 0.
The enzyme activity was maximum at glucose carbon source for protease and sucrose carbon source for xylanase (Table 5).
This study investigated the effects of physical exercise on mitochondrial respiratory chain activity, oxidative damage, and antioxidant enzyme activity in terms of training volume.
X] is the apparent enzyme activity determined by absorbance at wavelength X, AbsX is the absorbance of the sample/well at wavelength X, and Ptn is the amount of protein loaded into the well.
The effects of different concentrations of ARTEA330EC on changes in GST enzyme activity are shown in Figure 5.
Phytase activity assay: Ferrous sulphate molybdenum blue method was used for quantification of enzyme activity as described previously (Selvamohan et al.
Based on enzyme activity using Spectrophotometrically screening was done and four best strains were selected i.