DNA
DNA is present in the nuclei of living cells and carries genetic information. The DNA molecule consists of two helical nucleic acid chains which is very stable. The two nucleic acid chains are held together by hydrogen bonds. These hydrogen bonds are formed between specific pairs of bases on the chains. The two strands coil tightly around each other.
Proteins
The primary structure of a protein is a polypeptide which is a polymer of amino acids .Polypeptide chains form a helical structure owing to the hydrogen bonds formed between the N-H and C=O groups. This creates the secondary structure of proteins . In many proteins, including those in hair, wool and nails. Hydrogen bonding causes the polypeptide chains to become twisted into tightly coiled helices.
Plants
Water is transported throughout the structure of a plant by the intermolecular forces of adhesion and cohesion. Water moves through a xylem tube which is an incredibly small space for substances to pass through. However, through capillary action water can move simply by the ability for the water to cling to the plant surface walls. As a result all the plants you see and eat use intermolecular forces.
Adhesives (between different molecules)
FOOD INDUSTRYThe modern way of food retailing and self-service with its ready-to-eat meals, frozen products and instant foods would be unimaginable without adhesives for manufacturing impermeable packaging materials, such as laminated films, or for hermetically sealing packaging.
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MEDICAL INDUSTRYAdhesives are used extensively in the medical world, from simple plasters to advanced medical applications. Adhesives are integral to the production of paper tissues and nappies, allow tablets to be protected from the effects of moisture and allow wounds to be dressed. Trans dermal patches, such as the nicotine patch, permit a controlled delivery of nicotine into the bloodstream to help smokers quit.
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TECHNOLOGYIn the area of electronics, the classic joining technique of soldering is being increasingly replaced by bonding, in order for example to connect highly integrated components with each other in a stress-free way and without the need to use excessive heat.
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ENGINEERINGThe aircraft manufacturing industry provided the key technology impulse for modern bonding technology. The basic need for weight saving was the driving force for new design and construction methods. In modern Airbus aircraft, for example, about 30% of all components are joined using bonding technology.
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Soaps and Detergents
Molecules liquid state experience strong intermolecular attractive forces. When those forces are between like molecules, they are referred to as cohesive forces. the molecules of a water droplet are held together by cohesive forces, and the especially strong cohesive forces at the surface to form surface tension. SO, surface tension is a type of intermolecular forces ex. soap and detergents help the cleaning of clothes by lowering the surface tension of the water so that it more readily soaks into pores and soiled areas.