- What is the activity?
- How many Curies are dangerous?
- What is an activity assay?
- How do you measure protein activity?
- What is SI unit of radioactivity?
- How much becquerel is deadly?
- What are the units of specific activity?
- What does a unit of 1 becquerel represent?
- What does specific activity tell you?
- What is difference between activity and concentration?
- How do you calculate half life activity?
- What is the formula for radioactive decay?
- What is the difference between activity and specific activity?
What is the activity?
An activity is a phase, task, operation or other component within an activity group.
Activities provide a framework for establishing and collecting budgets, costs, revenues and statistical information.
You can structure activities to meet your specific information and reporting needs..
How many Curies are dangerous?
In today’s units 1 curie is about 30 Giga Becquerel. So a curie of any radioactivity (alpha, beta or gamma) would fry you. A sealed microcurie source could be safely handled. If a single curie is this powerful, then what would twenty million curies (a 20 MCi) be like?
What is an activity assay?
Importance of enzyme activity assays Enzyme assays are laboratory methods for measuring enzymatic activity. They are crucial for the study of enzyme kinetics and enzyme inhibition. There are three kinds of enzyme units for detecting enzyme activity, including enzyme activity, specific activity, and related terminology.
How do you measure protein activity?
How is Activity Measured? The biological activity of a recombinant protein is routinely measured using a bioassay, e.g. chemotaxis or cell proliferation assay, enzyme assay, or a functional ELISA.
What is SI unit of radioactivity?
The System International of units (SI system) uses the unit of becquerel (Bq) as its unit of radioactivity. One curie is 37 billion Bq. Since the Bq represents such a small amount, one is likely to see a prefix noting a large multiplier used with the Bq as follows: 37 GBq = 37 billion Bq = 1 curie.
How much becquerel is deadly?
For example, the human body has an activity of 8000 Bq – a value which may seem high but is in reality very small. It corresponds a few microcuries. Seeing activities written down in becquerels often gives the impression that such activities are exceptionally high and thus very dangerous.
What are the units of specific activity?
Specific enzyme activity (usually stated simply as ‘specific activity’) is the number of enzyme units per ml divided by the concentration of protein in mg/ml. Specific activity values are therefore quoted as units/mg or nmol/min/mg (if unit definition B is applied).
What does a unit of 1 becquerel represent?
The becquerel (English: /bɛkəˈrɛl/; symbol: Bq) is the SI derived unit of radioactivity. One becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second.
What does specific activity tell you?
The specific activity of an enzyme is another common unit. This is the activity of an enzyme per milligram of total protein (expressed in μmol min−1 mg−1). Specific activity gives a measurement of enzyme purity in the mixture. … The specific activity should then be expressed as μmol min−1 mg−1 active enzyme.
What is difference between activity and concentration?
Question: What’s the difference between the concentration and activity of a solution? Answer: The concentration of a solution is a measure of how much stuff is dissolved in a liquid. … Activity is an effective concentration, based on something called the chemical potential.
How do you calculate half life activity?
Activity after 1 half-life = 16 x 0.5 = 8 k B q.Activity after 2 half-lives = 8 x 0.5 = 4 k B q.Activity after 3 half-lives = 4 x 0.5 = 2 k B q.Activity after 4 half-lives = 2 x 0.5 = 1 k B q.Activity of the radioactive source 1 hour later = 1 k B q.
What is the formula for radioactive decay?
Average number of radioactive decays per unit time (rate) • or – Change in number of radioactive nuclei present: A = -dN/dt • Depends on number of nuclei present (N). During decay of a given sample, A will decrease with time.
What is the difference between activity and specific activity?
The main difference between enzyme activity and specific activity is that enzyme activity is the moles of substrate converted by the enzyme per unit time whereas specific activity is the activity of enzyme per milligram of total enzyme.