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. It is also one of the gaseous-cycle. Nitrogen is the most essential element for almost all forms of life. Living organisms need nitrogen atoms to make amino acids, proteins, enzymes, … Read more
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 follows: Asepsis, or keeping out microorganisms. Removal of microorganisms. Maintenance of anaerobic conditions, e.g., in a sealed, evacuated container. Use of high temperatures. Use of low temperatures. Drying; this includes … Read more
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 non-pathogenic forms. There are four different methods of sterilization. They are a) Heat b) Filtration c) Irradiation d) Chemical disinfection. The most widely applicable and reliable method is sterilization by … Read more