What is an effective concentration?
In pharmacology, an effective dose (ED) or effective concentration (EC) is a dose or concentration of a drug that produces a biological response. The term effective dose is used when measurements are taken in vivo, while the term effective concentration is used when the measurements are taken in vitro.
What is MEC in bioavailability?
Minimum effective concentration (MEC) is the minimum plasma concentration of a drug needed to achieve sufficient drug concentration at the receptors to produce the desired pharmacologic response, if drug molecules in plasma are in equilibrium with drug molecules in the various tissues (Figure 1.3).
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 is activity related to concentration?
In chemical thermodynamics, activity (symbol a) is a measure of the “effective concentration” of a species in a mixture, in the sense that the species’ chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution.
What is minimum effective concentration?
What is the minimal effective concentration?
Minimum Effective Concentration (MEC) β the lower level of a drug in the body that will still be effective.
What is MEC and MSC?
Plasma control drug release profile Where, MEC=Minimum effective concentration, MSC=Minimum safe concentration CRF=Controlled release formulation, CF=Conventional dosage formulation.
What is the minimum effective concentration?
How is activity concentration calculated?
Concentration activity in units of Bq/g, so you divide activity by the mass in g of the substance containing the isotope. t is the total counting time in the example its equal 2000 seconds.
What is activity concentration radionuclides?
The activity concentrations for natural existing radionuclides in 18 soil samples were measured using high-purity germanium detector HPGe. K concentration was ranging from 0.1% to 2.0% with an average of 1.2% in Abu Al Khasib and ranging from 0.9% to 1.8% with an average of 1.3% in Ad Dayr.
What do you understand by activity activity coefficient?
In solutions, the activity coefficient is a measure of how much a solution differs from an ideal solutionβi.e., one in which the effectiveness of each molecule is equal to its theoretical effectiveness and thus the activity coefficient would be 1. …
What are some activities to help with concentration?
1. Building Activities. One of the popular concentration activities for kids include building. This is a broad topic that you can customize for your classroom and unique student needs. It helps improve attention span and concentration to give children a goal and building materials.
How is the activity coefficient related to mass concentration?
The activity coefficient Ξ³, which is also a dimensionless quantity, relates the activity to a measured amount fraction xi (or yi in the gas phase), molality bi, mass fraction wi, amount concentration ci or mass concentration Οi:
Why are activities different from other measures of composition?
The difference between activity and other measures of composition arises because molecules in non-ideal gases or solutions interact with each other, either to attract or to repel each other. The activity of an ion is particularly influenced by its surroundings.
How does concentration affect the effectiveness of a disinfectant?
With other variables constant, and with one exception (iodophors), the more concentrated the disinfectant, the greater its efficacy and the shorter the time necessary to achieve microbial kill. Generally not recognized, however, is that all disinfectants are not similarly affected by concentration adjustments.