Recapitulation is a bold and influential idea that is particularly associated with Ernst Haeckel though many other biologists also supported it in the nineteenth and early twentieth centuries. According to the theory of recapitulation, the stages of an organism’s development correspond to the species’ phylogenetic history- in a phrase, “ontogeny recapitulates phylogeny.” Each stage in development corresponds to (that is, [...]
Here is a list of fifteen main chemical agents that can kill infection causing organisms:- 1. Preservatives 2. Acids 3. Nitrates and Nitrites 4. Alkalies 5. Salts 6. Reducing Agents 7. Oxidizing Agents 8. Phenols and Cresols 9. Alcohols 10. Glycols 11. Dyes 12. Mercury Compounds 13. Soaps 14. Surface-active Agents and Synthetic Detergents 15. Sulfonamides. Chemical Agent # 1. [...]
Certain properties make microorganisms well suited for industrial processes. Microorganisms not only possess a broad variety of enzymes to make an array of chemical conversions possible, but they also have a relatively high metabolic activity that permits conversions to take place rapidly. In addition, they have a large surface area for quick absorption of nutrients, and release of end-products. Moreover, [...]