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Related Concept Videos

Dosage Regimen Designs: Nomograms and Tabulations01:23

Dosage Regimen Designs: Nomograms and Tabulations

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Nomograms and tabulations are vital tools used by clinicians to design accurate and individualized dosage regimens. These instruments provide a straightforward method for adjusting dosages based on individual patient characteristics, including age, weight, and physiological condition. The foundation of a drug's nomogram is population pharmacokinetic data collected and analyzed using specific models. This data simplifies complex equations, presenting them diagrammatically or tabularly for easy...
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The Equilibrium Constant03:10

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Consider the oxidation of sulfur dioxide:
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Calculating the Equilibrium Constant02:46

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The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these concentrations are known, the calculation simply involves their substitution into the Kc expression.
For example, gaseous nitrogen dioxide forms dinitrogen tetroxide according to this equation:
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Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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Constant Volume Calorimetry02:41

Constant Volume Calorimetry

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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Related Experiment Video

Updated: Jan 30, 2026

Lumped-Parameter and Finite Element Modeling of Heart Failure with Preserved Ejection Fraction
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Nomogram for 2-deoxyglucose lumped constant for rat brain cortex

W M Pardridge, P D Crane, L J Mietus

    Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
    |January 1, 1982
    PubMed
    Summary

    The lumped constant, crucial for glucose metabolism measurement using the 2-deoxyglucose technique, can be reliably predicted across various physiological states using a nomogram. This nomogram remains accurate even with significant changes in blood-brain barrier hexose transport.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Physiology

    Background:

    • The Sokoloff 2-deoxyglucose technique quantifies local cerebral metabolic rate of glucose.
    • This technique necessitates a correction factor, known as the lumped constant.
    • Previous work established a model to predict lumped constant changes based on glucose and 2-deoxyglucose distribution.

    Purpose of the Study:

    • To assess the applicability of a previously developed nomogram for predicting the lumped constant in physiological states beyond barbiturate anesthesia.
    • To determine if alterations in blood-brain barrier transport constants affect the nomogram's predictive accuracy.

    Main Methods:

    • Utilized experimental data on brain and plasma glucose concentrations.
    • Employed a nomogram derived from blood-brain barrier transport constants (KM, Vmax, KD) for glucose and 2-deoxyglucose.
    • Examined the impact of varying transport constants on the nomogram's structure and predictive utility.

    Main Results:

    • Large alterations in blood-brain barrier hexose transport constants did not significantly change the nomogram's shape when KM or Vmax changes were consistent for both glucose and 2-deoxyglucose.
    • Confirmed that glucose and 2-deoxyglucose share the same hexose carrier.
    • No selective transport changes for only one hexose were reported.

    Conclusions:

    • The nomogram, constructed using transport constants from barbiturate-anesthetized states, is likely applicable for predicting the lumped constant in diverse physiological conditions.
    • This finding supports the robustness of the nomogram for estimating cerebral metabolic rate of glucose.
    • Further validates the use of the 2-deoxyglucose technique across different physiological contexts.