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Related Concept Videos

Acid and Bases: Ka, pKa, and Relative Strengths02:35

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This lesson delves into a critical aspect of the relative strengths of acids and bases. The strength of an acid is evaluated by the acid dissociation into its conjugate base and a hydronium ion in water. The complete dissociation of a strong acid is confirmed with a very high concentration of hydronium ions. As a result, an incomplete dissociation process affirms a weak acid. Therefore, the equilibrium is in the forward direction for strong acids and backward for weak acids in these reactions.
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Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa01:22

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The pH of urine, the drug's pKa, and the urine flow rate are vital parameters for drug reabsorption and excretion. Urinary pH varies between 4.6 and 8.0 and is influenced by diet, drug intake, and the patient's pathophysiology. It affects a drug's ionization state and reabsorption. For instance, carbohydrate-rich food produces alkaline urine promoting drug excretion, while proteins and certain medications like ascorbic acid lead to acidic urine enhancing reabsorption.
The pKa of a...
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Kendall's Tau Test01:16

Kendall's Tau Test

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Kendall's tau test, also known as the Kendall rank coefficient test, is a nonparametric method for assessing association between two variables. This test is particularly useful for identifying significant correlations when the distributions of the sample and population are unknown. Developed in 1938 by the British statistician Sir Maurice George Kendall, the tau coefficient (denoted as τ) serves as a rank correlation coefficient, with values ranging from -1 to +1.
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Kruskal-Wallis Test01:19

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The Kruskal-Wallis test, also known as the Kruskal-Wallis H test, serves as a nonparametric alternative to the one-way ANOVA, offering a solution for analyzing the differences across three or more independent groups based on a single, ordinal-dependent variable. This statistical test is particularly valuable in scenarios where the data does not meet the normal distribution assumption required by its parametric counterparts. Kruskal-Wallis test is designed typically to handle ordinal data or...
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One-Compartment Open Model: Urinary Excretion Data and Determination of k01:11

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The one-compartment open model leverages urinary excretion data to estimate renal clearance, which gauges the kidney's capacity to expel a drug. This method offers several benefits, including directly measuring drug elimination and assessing the kidney's contribution to overall drug clearance. However, this approach has limitations. It assumes sole renal excretion of the drug, which is not true for all drugs. Accurate urinary excretion and plasma drug concentration measurement can also...
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Turnover Number and Catalytic Efficiency01:19

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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Related Experiment Video

Updated: Jul 27, 2025

Analysis of Gene Function and Visualization of Cilia-Generated Fluid Flow in Kupffer's Vesicle
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K v 7 Channel Opener Retigabine Reduces Self-Administration of Cocaine but Not Sucrose in Rats.

Esteban S Urena, Cody C Diezel, Mauricio Serna

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    Summary
    This summary is machine-generated.

    Retigabine, a Kv7 channel opener, reduced cocaine self-administration in rats, suggesting Kv7 channels are a potential therapeutic target for addiction treatment.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Addiction Research

    Background:

    • Drug misuse necessitates novel therapeutics.
    • Kv7/KCNQ channels in the mesolimbic pathway may influence the transition to chronic drug use.
    • Previous studies used noncontingent drug delivery, limiting generalizability to self-administration models.

    Approach:

    • Investigated retigabine's effect on instrumental behavior in male Sprague Dawley rats.
    • Validated retigabine's action in a cocaine-induced conditioned place preference (CPP) assay.
    • Trained rats for cocaine and sucrose self-administration (SA) under fixed-ratio and progressive-ratio schedules.

    Key Points:

    • Retigabine reduced cocaine-induced place preference acquisition.
    • Retigabine pretreatment attenuated cocaine self-administration but not sucrose self-administration.
    • Cocaine SA, unlike sucrose SA, was linked to reduced Kv7.5 subunit expression in the nucleus accumbens.

    Conclusions:

    • Kv7 channel modulation specifically reduces drug SA behavior relevant to compulsive-like behaviors.
    • These findings support Kv7 channels as a therapeutic target for psychiatric disorders involving reward circuitry dysfunction.