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Related Concept Videos

Partial Fractions01:28

Partial Fractions

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A partial fraction is a component of a rational expression represented as the sum of simpler fractions. When a rational function is expressed as a ratio of two polynomials, it can often be decomposed into a sum of fractions whose denominators are simpler polynomials, typically linear or irreducible quadratic factors. This process is called partial fraction decomposition, and it is used to simplify complex expressions for integration, solving equations, or analysis.Partial fraction decomposition...
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Source And Potency Of Stem Cells01:27

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Stem cells are undifferentiated cells with extensive self-renewal properties that help them maintain their population during the fetal and adult stages of life. They can specialize in all cell types of the human body. However, their differential potential may vary and can be classified into five types. Stem cells can be (1) Totipotent, (2) Pluripotent, (3) Multipotent, (4) Oligopotent, and (5) Unipotent. Each stem cell has a specific origin; the fertilized egg or zygote is a totipotent cell and...
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Mixtures of Gases: Dalton's Law of Partial Pressures and Mole Fractions03:03

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Unless individual gases chemically react with each other, the individual gases in a mixture of gases do not affect each other’s pressure. Each gas in a mixture exerts the same pressure that it would exert if it were present alone in the container. The pressure exerted by each individual gas in a mixture is called its partial pressure.
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Dose-Response Relationship: Potency and Efficacy01:22

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The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
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Dalton's Law of Partial Pressure01:11

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The partial pressure of a gas is a measure of the thermodynamic activity of the gas's molecules. The pressure that a gas would create if it occupied the total volume available is called the gas's partial pressure. If two or more gases are mixed together in a container, the molecules move randomly and collide with each other, causing them to reach thermal equilibrium. When the gases have the same temperature, their molecules have the same average kinetic energy. Thus, each gas obeys the...
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Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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A Novel Method for Qualification of a Potency Assay through Partial Computer Simulation.

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|February 16, 2018
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Summary

This study introduces a cost-effective method for early-stage biotherapeutic development, using reduced bioassay data and computer simulation to estimate relative potency. This approach ensures bioassay validity across a desired range, crucial for manufacturing accuracy and precision.

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Area of Science:

  • Biopharmaceutical Manufacturing
  • Bioanalytical Chemistry
  • Statistical Modeling in Drug Development

Background:

  • Potency measurement is critical for biotherapeutics and vaccines, relying on bioassays that compare new batches to reference standards.
  • Accurate and precise potency measurements are essential for product manufacturing, typically assessed through full validation studies.
  • Full validation studies are costly during early development, necessitating alternative methods to ensure bioassay validity.

Purpose of the Study:

  • To develop and evaluate an alternative method for ensuring bioassay validity during early-stage biopharmaceutical development.
  • To estimate missing relative potency values across a desired range using a reduced bioassay procedure and computer simulation.
  • To provide a cost-effective approach for assessing bioassay performance when full validation is not feasible.

Main Methods:

  • A reduced bioassay procedure using only reference standard and 100% relative potency concentration-response data.
  • Computer simulation to estimate missing relative potency values across the desired product range.
  • Bayesian Markov Chain Monte Carlo (MCMC) modeling to generate predictive distributions of concentration-response data.

Main Results:

  • The reduced procedure, combined with computer simulation, effectively estimates bioassay model parameters and their variance-covariance structure.
  • Bayesian MCMC modeling successfully generates predictive distributions for estimating relative potency values.
  • Comparison with full datasets via Monte Carlo simulation demonstrates the validity and efficiency of the reduced procedure.

Conclusions:

  • The proposed alternative method provides a reliable and cost-effective way to ensure bioassay validity in early biopharmaceutical development.
  • This approach supports product development by ensuring the accuracy and precision of potency measurements.
  • The combination of reduced data, simulation, and Bayesian modeling offers a powerful tool for biopharmaceutical laboratories.