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Rice and grains, staple foods in many diets worldwide, are incomplete proteins because they lack sufficient amounts of certain essential amino acids necessary for human health. Specifically, lysine is the amino acid most commonly deficient in rice and other grains. Essential amino acids cannot be synthesized by the human body and must be obtained from the diet. Lysine is important for proper growth, collagen formation, and the production of antibodies, hormones, and enzymes. To combat this deficiency, it is important for diets relying heavily on rice and grains to incorporate complementary protein sources, such as beans or legumes, which are high in lysine, to achieve a balanced amino acid profile for overall nutritional adequacy.
Amino acids, the building blocks of proteins, have a generic structure that consists of a central carbon atom (C) known as the alpha carbon, bonded to four different groups: an amino group (NH2), a carboxyl group (COOH), a hydrogen atom (H), and a variable side chain or R group that differs among amino acids. The R group determines the unique properties of each amino acid, influencing the protein's structure and function. This generic formula is what allows amino acids to link together in chains to form proteins, through peptide bonds connecting the carboxyl group of one amino acid to the amino group of another.
The "W" in oil grade stands for "Winter," indicating the oil's viscosity (or flow) at colder temperatures. Viscosity grading is essential for engine oils, ensuring they provide adequate protection across different operating temperatures. A lower "W" number signifies better performance in cold weather, helping the engine start more easily and safeguarding components. For example, a 5W-30 oil flows more easily at low temperatures than a 10W-30 oil. The second number (after the W) reflects the oil's viscosity at high temperatures, relevant for engine operation at normal or elevated temperatures.
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