A slurry bond coat is a construction material used to enhance the adhesion between two surfaces, typically in paving or tiling jobs. It is a mix of water, cement, and sometimes aggregates, applied as a thin layer before laying the final material, such as tiles or pavement slabs. The purpose of a slurry bond coat is to create a stronger bond than if the surfaces were directly joined, ensuring durability and longevity of the construction. It is particularly important in scenarios where the base surface may not be ideally suited for direct adhesion, providing a necessary intermediary layer that can flexibly adapt to different materials and environmental conditions.

Amino acids are organic compounds that serve as the building blocks for proteins, critical for life. In total, there are 20 standard amino acids encoded by the universal genetic code, essential for protein synthesis. However, more than 500 amino acids are known, with roles in various metabolic pathways and non-protein functions in organisms. Of the 20 standard amino acids, nine are considered essential for humans because our bodies cannot synthesize them, and they must be obtained through our diet. These essential amino acids include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. The remaining 11 are classified as non-essential because our bodies can produce them. Understanding amino acids' diversity and function is crucial for nutritional science, biochemistry, and medicine, highlighting the complexity and elegance of biological systems.