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Related Concept Videos

Volume of Distribution01:20

Volume of Distribution

1.3K
The apparent volume of distribution (Vd) is a crucial pharmacokinetic parameter representing the hypothetical body fluid volume into which a drug disperses. It is calculated based on the total amount of drug in the body (estimated from the administered dose and bioavailability) divided by the plasma drug concentration. The total amount of drug in the body does not directly refer to the dose given but is derived by accounting for absorption, distribution, metabolism, and excretion processes.
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Drug Distribution: Volume of Distribution01:25

Drug Distribution: Volume of Distribution

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The volume of distribution refers to the theoretical volume necessary to contain the entire amount of an administered drug at the same concentration observed in the blood plasma. The body's intracellular fluid compartment, which makes up two-thirds of the total body water, is contrasted with the extracellular fluid compartment—comprising plasma and interstitial fluid—that accounts for one-third. The volume of distribution can vary depending on the characteristics of the drug.
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The Born-Haber Cycle02:44

The Born-Haber Cycle

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Lattice Energy 
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Transfer Function to State Space01:23

Transfer Function to State Space

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State-space representation is a powerful tool for simulating physical systems on digital computers, necessitating the conversion of the transfer function into state-space form. Consider an nth-order linear differential equation with constant coefficients, like those encountered in an RLC circuit. The state variables are selected as the output and its n−1 derivatives. Differentiating these variables and substituting them back into the original equation produces the state equations.
In an RLC...
811
State Space to Transfer Function01:21

State Space to Transfer Function

591
The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
591
Cholinesterases: Distribution and Function01:22

Cholinesterases: Distribution and Function

1.1K
Cholinesterases are a group of serine hydrolase enzymes that play a crucial role in the breakdown of choline esters. The two primary types of cholinesterases are acetylcholinesterases (AChEs) and butyrylcholinesterase (BuChEs), which differ in their distribution, function, and substrate specificity. AChEs, also known as true cholinesterases, specifically hydrolyze acetylcholine, while BuChEs, often referred to as pseudocholinesterases, can hydrolyze various choline esters, including...
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Related Experiment Video

Updated: Feb 7, 2026

Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks

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[Bidirectional Reflectance Distribution Function of Space-Borne Quartz Volume Diffuser].

Min-jie Zhao, Fu-qi Si, Yi-huai Lu

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |July 13, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Quartz Volume Diffusers (QVDs) ensure accurate solar spectrum measurements for space-borne spectrometers. Two QVD types exhibit excellent Lambertian features, making them suitable for solar spectrum observations and future UV irradiation studies.

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    Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy
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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Remote Sensing

    Background:

    • Accurate solar spectrum observation is critical for gas retrievals in space-borne differential optical absorption spectrometers.
    • Quartz Volume Diffusers (QVDs) are essential components for achieving a uniform solar spectrum observation.

    Purpose of the Study:

    • To evaluate the bidirectional reflectance distribution function (BRDF) of QVDs.
    • To identify QVDs with superior Lambertian properties for space-borne spectroscopic applications.

    Main Methods:

    • Utilized a bidirectional reflectance distribution function (BRDF) measurement instrument.
    • Employed a relative measurement method with F4 (polytetrafluoroethylene) powder pressboard as a reference.
    • Measured BRDF for four types of QVDs across a wavelength range of 180–880 nm and observation angles of -70° to +70°.

    Main Results:

    • Characterized the BRDF of four QVD types within the specified spectral and angular ranges.
    • Identified two QVD types exhibiting well-defined Lambertian characteristics.
    • Demonstrated that QVDs possess favorable scattering properties for solar spectrum measurement, comparable to F4.

    Conclusions:

    • Selected QVDs with excellent Lambertian features are suitable for measuring diffuse sunlight in space-borne spectrometers.
    • The validated QVDs support future measurements including Ultraviolet irradiation, atomic oxygen erosion, and comparative studies.