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Related Concept Videos

Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

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Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
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Nonlinear Pharmacokinetics: Overview01:19

Nonlinear Pharmacokinetics: Overview

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Nonlinear or dose-dependent pharmacokinetics is a phenomenon that occurs when the pharmacokinetic parameters of certain drugs deviate from linear pharmacokinetics at higher doses. These drugs do not follow the expected first-order kinetics, where the rate of drug elimination is directly proportional to the drug concentration. Instead, they exhibit a nonlinear relationship, which can be attributed to several factors.
Nonlinearity can arise due to the saturation of plasma protein-binding or...
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Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

Nonlinear Pharmacokinetics: Michaelis-Menten Equation

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The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
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Nonlinear Pharmacokinetics: Role of Transporters01:27

Nonlinear Pharmacokinetics: Role of Transporters

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A drug's nonlinear kinetics can be influenced by a diverse range of transporter proteins that serve as crucial players in drug distribution. These transporters, found within cells, can enhance or reduce local drug concentrations by facilitating the influx or efflux of drugs. For instance, the expression of xenobiotic transporters can be influenced by factors such as age and gender, potentially impacting the linearity of drug response.
Polymorphisms occurring in drug transporters can alter...
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Nonlinear Pharmacokinetics: Bioavailability and Protein-Drug Binding01:22

Nonlinear Pharmacokinetics: Bioavailability and Protein-Drug Binding

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When a drug follows nonlinear pharmacokinetics, its bioavailability, the amount of the drug that reaches the systemic circulation, can change with different doses. This is due to the presence of a saturable pathway. The pathway becomes saturated as the drug concentration increases, decreasing the absorption rate. Consequently, the drug's bioavailability may be lower than expected at higher doses.
To quantify the extent of bioavailability, pharmacologists often use a parameter called .
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Nonlinear Pharmacokinetics: Drug Elimination for IV Bolus Injection00:59

Nonlinear Pharmacokinetics: Drug Elimination for IV Bolus Injection

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In pharmacokinetics, the elimination rate of a drug following a capacity-limited model is primarily controlled by two parameters: Vmax and KM. These parameters are crucial in how the drug behaves inside the body after administration.
Following the administration of a single intravenous (IV) bolus injection, we can determine the concentration of the drug in the plasma at any given time. This calculation is achieved using a specific equation that integrates the values of Vmax and KM.
We can also...
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Related Experiment Video

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Nonlinear wavefront shaping with optically induced three-dimensional nonlinear photonic crystals.

Shan Liu1, Krzysztof Switkowski2,3, Chenglong Xu4

  • 1Laser Physics Center, Research School of Physics and Engineering, Australian National University, Canberra, ACT, 2601, Australia.

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Scientists demonstrated nonlinear wavefront shaping using 3D nonlinear photonic crystals (NPCs). This breakthrough enables precise control over light generation and shaping at new frequencies, advancing optical technologies.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nonlinear Optics

Background:

  • Generating coherent light with specific amplitude and phase is crucial for optical technologies.
  • Nonlinear wavefront shaping uses nonlinear optical processes to control light properties.
  • Phase velocity matching is essential for efficient nonlinear frequency conversion.

Purpose of the Study:

  • To experimentally demonstrate nonlinear wavefront shaping using 3D nonlinear photonic crystals (NPCs).
  • To explore the potential of 3D NPCs for advanced light generation and control.
  • To overcome limitations of lower-dimensional structures in nonlinear optical interactions.

Main Methods:

  • Fabrication of 3D NPCs using ultrafast-light-induced ferroelectric domain inversion.
  • Experimental setup for nonlinear wavefront shaping and frequency conversion.
  • Characterization of generated light beams' amplitude and phase profiles.

Main Results:

  • Successful demonstration of nonlinear wavefront shaping with 3D NPCs.
  • 3D NPCs provide full spatial control for phase mismatch compensation.
  • Generation of coherent light with tailored properties at new frequencies.

Conclusions:

  • 3D NPCs offer unprecedented capabilities for nonlinear optical wavefront shaping.
  • This approach significantly advances the control over coherent light generation.
  • The technology holds promise for future optical applications requiring precise light manipulation.