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.
Hydrogen bonds can form within a molecule or between atoms in different molecules. Although an organic molecule is not required for hydrogen bonding, the phenomenon is extremely important in biological systems. Examples of hydrogen bonding include: between two water molecules; holding two strands of DNA together to form a double helix