In this article we will discuss about the three categories of methods in order to obtain particular kind of organism, physical, chemical and biological methods. 1. Physical Conditions for Growth: (i) Heat Treatment: This is applied in case of bacteria which form spores for example Bacillus spp. Lactobacillus spp. etc. To select the endospore-forming bacteria, a mixed culture can be [...]
The following points highlight the top six methods that are used for preservation of organisms. The methods are: 1. Agar Slant Culture 2. Agar Slant Culture Covered with Oil 3. Saline Suspension 4. Preservation at Very Low Temperature 5. Preservation by Drying in Vacuum 6. Lyophilization or Freeze Drying. Method # 1. Agar Slant Culture: Agar slants are prepared in [...]
In this article we will discuss about the signalling mechanisms, both in eukaryotes and prokaryotes. 1. Eukaryotic Cell-to-Cell Signaling: The integrative nature of biological systems could be understood after the pioneering work of Claude Bernard (1813-1878) of France. He gave the concept of the miliew interieur and suggested the system of ductless gland (i.e. endocrine glands) for integrating function and [...]