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.
The #delta^+# of the hydrogens can interact with the #delta^-# of the oxygens on other water molecules (as depicted by the dashed lines) Hydrogen bonding is the strongest type of intermolecular force. Substances that exhibit hydrogen bonding tend to have relatively high boiling points and melting points.