Microbiology - Microbial physiology, bacterial photosynthesis, Nutrition in microorganisms, macronutrients, micronutrients, growth factors

1. Topic: Nutritional requirements of
microorganisms – Micronutrients & Growth
Factors
Lecture number 2
Presented by
Ms Naveena K
Department of Microbiology
St Anns College for Women, Hyderabad.

3. Contents:
1) Micronutrients
2) Learning objectives
3) Micronutrients.
4) Growth factors.
5) Reference books.
6) Question bank.
7) Source
.

4. Nutritional requirements
 To differentiate between macronutrients and
micronutrients.
 Role of each nutrient (element) in bacterial growth.
 To list out micronutrients.
 Importance of growth factors.
Learning
objectives
Learning
outcomes

5. Micro nutrients or trace
elements
Required in minute quantities.
Cobalt, copper, manganese, molybdenum, nickel,
selenium, tungsten, vanadium and zinc.
They are metals playing the role of cell’s catalysts and
many of them play a structural role in various enzymes.
The functions of these elements are s follows.

7. Growth factors
Growth factors are organic compounds that a
cell must have for growth but cannot synthesize
itself.
Organic nutrients of this type are collectively
known as growth factors (essential metabolites)
and can be categorized into three groups.
Amino acids - constituents of proteins.
 Purines & pyrimidines - constituents of
nucleic acids.
Vitamins - needed growth factor and form

9. Reference books:
General Microbiology by Roger Y. Stanier (page no.
22-25)
Microbial Metabolism and Molecular Biology by BD
Singh, RP Singh