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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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Application of Nonlinear Inequalities01:29

Application of Nonlinear Inequalities

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A nonlinear inequality describes a comparison involving an expression that curves or behaves more complexly than a straight line. These inequalities often appear in forms that include squares, products, or variables in the denominator.To solve such an inequality, one starts by rewriting it so that zero appears on one side. For example, the inequality:  can be factored as: This form makes it easier to identify the values that cause the expression to equal zero. In this case, the...
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Introduction to Nonlinear Inequalities01:25

Introduction to Nonlinear Inequalities

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Linear and nonlinear inequalities are fundamental for analyzing variable relationships and identifying ranges satisfying specific conditions. A linear inequality involves variables raised only to the first power, resulting in a straight-line graph. This line partitions the coordinate plane into two distinct regions: one that satisfies the inequality and one that does not. Each region represents a set of solutions where the linear relationship holds true under the specified constraint.Nonlinear...
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Nonlinear Pharmacokinetics: Overview01:19

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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.
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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.
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Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

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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.
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Biomolecular Imaging of Cellular Uptake of Nanoparticles using Multimodal Nonlinear Optical Microscopy
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Efficient higher-order nonlinear optical effects in CdSe nanowaveguides.

Jiaxin Yu, Fang Liu, Zhaoqi Gu

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    We enhanced higher-order nonlinear optical (HO-NLO) responses in cadmium selenide (CdSe) nanowaveguides using evanescent wave coupling. This technique boosts signal efficiency for applications in nonlinear optical devices.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Stimulating higher-order nonlinear optical (HO-NLO) responses in individual semiconductor nanostructures is difficult due to low nonlinear coefficients and limited molecular counts.
    • Efficiently generating HO-NLO signals from nanostructures is crucial for advanced optical device applications.

    Purpose of the Study:

    • To demonstrate efficient third harmonic generation and multi-photon luminescence in cadmium selenide (CdSe) nanowaveguides.
    • To investigate the use of evanescent wave coupling for enhancing HO-NLO effects in nanostructures.

    Main Methods:

    • Utilizing evanescent wave coupling to transfer light energy from an optical microfiber to a single CdSe nanowaveguide.
    • Achieving high coupling efficiency (up to 70%) under optimized conditions.
    • Analyzing the excitation power dependence of multi-photon luminescence.

    Main Results:

    • Demonstrated efficient third harmonic generation and multi-photon luminescence in CdSe nanowaveguides.
    • Observed a fourth-order excitation power dependence for 3-photon luminescence, attributed to surface defect mechanisms.
    • Confirmed enhanced HO-NLO effects due to efficient evanescent wave coupling.

    Conclusions:

    • Evanescent wave coupling provides an effective method for enhancing HO-NLO responses in semiconductor nanostructures.
    • This approach facilitates the observation of previously challenging signals, paving the way for practical nonlinear optical devices.
    • Surface defect mechanisms play a role in the observed multi-photon luminescence in CdSe nanowaveguides.