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The twenty common amino acids, which are the building blocks of proteins, include: Alanine, Arginine, Asparagine, Aspartic Acid, Cysteine, Glutamine, Glutamic Acid, Glycine, Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Proline, Serine, Threonine, Tryptophan, Tyrosine, and Valine. These amino acids can be categorized based on their side chains' properties into nonpolar, polar, acidic, and basic groups. Essential amino acids, such as Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, and Valine, cannot be synthesized by the human body and must be obtained from the diet. The proper balance of these amino acids is crucial for various bodily functions, including tissue repair, nutrient absorption, and hormone production.
Natural fibers are indeed polymers. They are made up of long chains of molecules, composed of repeated smaller units known as monomers. These polymers can be either protein-based, such as wool and silk, deriving from animals, or cellulose-based, like cotton and linen, coming from plants. In the polymer structure of these fibers, the individual monomers are covalently bonded, creating a strong and durable material. This structure is what gives natural fibers their remarkable properties, including strength, elasticity, and absorbency. The understanding of natural fibers as polymers is foundational to both the fields of materials science and textile engineering, where this knowledge is applied to improve fabric performance and develop sustainable materials.
Dyeing hemp cord is similar to dyeing other natural fibers, with a focus on using either fiber-reactive dyes or natural dyes for best results. Firstly, prepare the hemp cord by washing it to remove any oils or impurities that might affect dye uptake. Soak the cord in water to ensure it's fully saturated. Meanwhile, prepare your dye according to its instructions; fiber-reactive dyes will require a soda ash fixative to bond the dye to the fiber, whereas natural dyes often require a mordant like alum to fix the dye. After dye preparation, immerse the hemp cord in the dye solution ensuring it's completely submerged. Stir gently to ensure even dye uptake. The time it needs to be left in the dye bath can vary from 30 minutes to several hours, depending on the desired intensity of the color. After dyeing, rinse the cord in cold water until the water runs clear, then hang it up to dry away from direct sunlight. Using a fixative or mordant and rinsing well will help ensure the color lasts longer.
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