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Amino acids that are attracted to the cathode in an electric field are those with positively charged side chains at the pH being used in the experiment. Typically, this includes basic amino acids such as lysine, arginine, and histidine. These amino acids possess side chains that, at physiological pH (around 7.4), are positively charged. Electrophoresis, for instance, takes advantage of this property to separate proteins or peptides based on their charge and size. At the cathode, which is negatively charged, positively charged molecules will migrate towards it under an electric field. The charges on amino acids can vary with pH due to the protonation or deprotonation of their side chains, so the specific amino acids attracted to the cathode can change with the pH of the medium.
Resin identification coding, commonly seen as numbers 1 through 7 enclosed in chasing arrows on plastic products, indicates the type of polymer used and guides recycling processes. These codes, standardized by the Society of the Plastics Industry (SPI) in 1988, facilitate sorting in recycling facilities. Number 1 signifies PET (Polyethylene Terephthalate), typically used in water bottles. Number 2 represents HDPE (High-Density Polyethylene), found in milk jugs and detergent bottles. LDPE (Low-Density Polyethylene), marked as 4, is used in plastic wraps and squeeze bottles. PVC (Polyvinyl Chloride), number 3, is common in window frames and pipes. Number 5 denotes PP (Polypropylene), utilized in yogurt containers and bottle caps. Polystyrene, often used in foam cups and packaging peanuts, is identified as 6. Lastly, code 7, labeled as "Other," covers all other types of resins not included in the previous categories, like polycarbonate and nylon. Understanding these codes helps consumers make informed decisions about recycling and waste management.
Excess amino acids can be harmful since the body cannot store them like fats and carbohydrates. When consumed in large quantities, amino acids are deaminated by the liver; this process produces ammonia, a toxic compound that the liver converts into urea for excretion. A high intake of amino acids can lead to an overload on the liver and kidneys, which must work harder to eliminate the byproducts of protein metabolism. Furthermore, imbalances in amino acid levels can disrupt the body's nutrient balance, potentially leading to negative health consequences like increased risk of cardiovascular diseases, renal disease, and bone density loss. It's essential to consume amino acids in moderation, through a balanced diet, to avoid overburdening the body's metabolic processes.
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