The Nitrogen cycle
The cyclic movement of nitrogen between atmosphere and living organisms or the exchange of nitrogen between atmosphere and living organisms is known as nitrogen cycle....
Methods and principles of food preservation
Most kinds of food are readily decomposed by microorganisms unless special methods are used for their preservation. The chief methods of food preservation are as...
Sterilization by heat
Sterilization means the freeing of an article from all living forms that includes viruses, bacteria and their spores, fungi and their spores, both pathogenic and...