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Related Concept Videos

Frequency of Spring-Mass System01:17

Frequency of Spring-Mass System

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One interesting characteristic of the simple harmonic motion (SHM) of an object attached to a spring is that the angular frequency, and the period and frequency of the motion, depend only on the mass and the force constant of the spring, and not on other factors such as the amplitude of the motion or initial conditions. We can use the equations of motion and Newton's second law to find the angular frequency, frequency, and period.
Consider a block on a spring on a frictionless surface. There...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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States of Water01:23

States of Water

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thermal Expansion01:22

Thermal Expansion

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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Related Experiment Video

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Probiotic Studies in Neonatal Mice Using Gavage
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From Probiotic to Prebiotic Using Thermal Spring Water.

Joshua Zeichner, Sophie Seite

    Journal of Drugs in Dermatology : JDD
    |June 8, 2018
    PubMed
    Summary

    La Roche-Posay Thermal Spring Water (LRP-TSW) acts as a topical probiotic and prebiotic, enhancing skin microbiota diversity. This improves inflammatory skin conditions like atopic dermatitis and psoriasis, reducing dryness and itching.

    Area of Science:

    • Dermatology
    • Microbiology
    • Biotechnology

    Background:

    • La Roche-Posay Thermal Spring Water (LRP-TSW) possesses probiotic and prebiotic properties.
    • It enhances the diversity of the skin's natural microbial community.

    Purpose of the Study:

    • To review the role of LRP-TSW as a topical therapy.
    • To explore its effects on skin microbiota diversity, dryness, and pruritus in inflammatory skin diseases.

    Main Methods:

    • Literature review of studies on LRP-TSW.
    • Analysis of clinical data regarding its impact on skin microbiota and conditions.

    Main Results:

    • LRP-TSW contains minerals and microbes contributing to its therapeutic effects.
    • Topical LRP-TSW increases beneficial Gram-negative bacteria and decreases Gram-positive bacteria.

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  • Significant improvements observed in atopic dermatitis, psoriasis, and general skin dryness.

    • Conclusions:

    • Topical LRP-TSW enhances skin microbiota diversity.
    • It presents a valuable treatment and maintenance option for inflammatory skin diseases.