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What are Lipids?01:38

What are Lipids?

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Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Chemical Isolation, Quantification, and Separation of Skin Lipids from Reptiles
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Lipids in the Skin and pH.

Johannes Wohlrab, Alexandra Gebert, Reinhard H H Neubert

    Current Problems in Dermatology
    |August 22, 2018
    PubMed
    Summary

    Skin surface pH is crucial for lipid synthesis in the stratum corneum (SC). Maintaining the correct pH gradient is vital for skin barrier function and preventing issues like accelerated desquamation.

    Area of Science:

    • Dermatology
    • Biochemistry
    • Skin Physiology

    Background:

    • The stratum corneum (SC) lipid synthesis is significantly influenced by pH.
    • Enzyme activity crucial for ceramide, free fatty acid, and cholesterol production is pH-dependent.
    • Skin pH affects membrane structure and properties.

    Purpose of the Study:

    • To elucidate the role of pH in SC lipid synthesis.
    • To understand the impact of pH on skin barrier function.
    • To explore the relationship between pH gradient and pathological processes.

    Main Methods:

    • Analysis of enzyme activity in relation to pH.
    • Investigation of SC membrane properties under varying pH conditions.
    • Study of pH gradient dynamics in the stratum corneum.

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    Main Results:

    • pH is a key determinant of lipid synthesis in the SC.
    • Alkaline pH inhibits regenerative pathways and promotes desquamation.
    • The sigmoidal pH gradient is critical for understanding barrier dysfunction.

    Conclusions:

    • Skin surface pH is essential for maintaining SC lipid synthesis and barrier integrity.
    • Deviations from the optimal pH can lead to impaired barrier function and increased skin shedding.
    • Understanding the SC pH gradient is vital for addressing skin barrier disorders.