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Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
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Standard Entropy Change for a Reaction03:00

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Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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A living cell's primary tasks of obtaining, transforming, and using energy to do work may seem simple. However, the second law of thermodynamics explains why these tasks are harder than they appear. None of the energy transfers in the universe are completely efficient. In every energy transfer, some amount of energy is lost in a form that is unusable. In most cases, this form is heat energy. Thermodynamically, heat energy is defined as the energy transferred from one system to another that...
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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Sample Entropy of High Frequency Oscillations for Epileptogenic Zone Localization.

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    A new two-stage method accurately identifies the epileptogenic zone (EZ) in epilepsy patients. This approach uses high-frequency oscillations and sample entropy from iEEG data to improve seizure control treatment.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Medication-resistant epilepsy often requires surgical intervention.
    • Accurate delineation of the epileptogenic zone (EZ) is critical for successful epilepsy surgery.
    • Current methods for EZ identification can be challenging and invasive.

    Observation:

    • High-frequency oscillations (HFOs) are potential biomarkers of the EZ.
    • Sample entropy can quantify signal complexity in electroencephalogram (iEEG) data.

    Findings:

    • A novel two-stage algorithm detects HFOs directly from multi-channel iEEG.
    • Sample entropy is computed for channels exhibiting HFOs to identify EZ-correlated channels.
    • The proposed method demonstrates accurate EZ estimation via receiver operating characteristic curve analysis.

    Implications:

    • This technique offers a more precise method for pre-surgical EZ mapping.
    • Improved EZ delineation can lead to better surgical outcomes and reduced seizure recurrence.
    • The algorithm has the potential to enhance treatment strategies for drug-resistant epilepsy.