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Chemistry

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by

Elitsa Vrancheva

on 3 December 2012

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Transcript of Chemistry

Fats, Lipids, Membranes By Antoni Vladimirov & Elitsa Vrancheva Fats Functions of Fats Lipids Types of Lipids Trans fatty acids Food that contian lipids Any of a group of organic compounds, including the fats, oils, waxes, sterols, and triglycerides, that are insoluble in water but soluble in nonpolar organic solvents are lipids. They are oily to the touch, and together with carbohydrates and proteins constitute the principal structural material of living cells. The simple lipids include the fats, waxes, and sterols. Fats are the most spread compounds of this group. as a source of energy heat-insulate function protective function food reservation regulation of body temperature water reservation regulation Types of Fats Over 1300 types of fats exist. According to the kinds of acid residia that build up fats the are: Saturated Unsaturated Unsaturated fats are divided into polyunsaturated- Ω 3 & Ω6 and monounsaturated- Ω 9. Representatives of saturated fatty acids are palmitic acid and stearic acid Representative of unsaturated fatty acids are oleic acid, linoleic acid and linolenic acid. Phospholipids They are the second largest lipid component in the organism after fats. Waxes They have protective function and they don't allow to water to evaporate. Waxes are on the surface of some plants as : Waxes are on the feathers of the sea birds as well Cartenoids Carotenoids are organic pigments that are found in the chloroplasts of plants and some other photosynthetic organisms like algae, some bacteria, and some fungi. The orange ring surrounding Grand Prismatic Spring in Yellowstone National Park is due to carotenoid molecules, produced by mats of algae and bacteria. Sterols Sphingolipids Their general function is to ensure the mechanical stability and the relatively inertness of the cell membrane. Another functions of sphingolipids are intercellular signalization and spreading. Sterins Steroids cholesterin sisterin (cholesterol) Vitamin D plays an important role in the metabolism. Margarine Membranes A membrane is a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Structure of cell membrane Cell membrane Carbohydrates Proteins LIpids Structural Receptor Transport Glycoproteins Phospholipids Cholesterol Glycolipids Funtions of membranes Protective

As a base of attachment

Supportive . Animal cells, plant cells, prokaryotic cells, and fungal cells have cell membranes.
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