One remedy for a deficiency of vitamin B12 for the elderly is a regular injection of this important nutrient. The vitamin B12 injection dose depends on factors such as gender and age.
Hydrogen bonds happen in alcohols. As a matter of fact, any molecule that contains a hydrogen atom attached to an atom of nitrogen or oxygen is capable of such a bond. Ethanol is one such alcohol that features hydrogen bonds. Ammonia is an example of hydrogen bonding. In the case of ammonia, however, the hydrogen bond happens to be relatively weak.
Other Chemical Bonds. The other bonds are not nearly as strong as these first three. Van der Waals and clathrate are bonds between molecules, not atoms as the other types of bonds. Hydrogen bonds refer specifically to the types of bonds formed with hydrogen atoms, such as the water in sweat.