What variables alter increase or decrease a microbes growth

What variables alter (increase or decrease) a microbes’ growth curve?

Solution

The variables are:

1) Temparature:Mainly very high and very low temparature tendto reduce bacterial growth rate,specific range of temparature is mainly suitable for bacterial growth and growth curve exceptions are psychrophiles.

2) Nutrient availability:If nutrient avalilabilty is suffient then the bacterial growh will be on the higher side and if it is low bacterial growth willbe lower.

3)Metabolic wastes: If in the culture medium amount of metabolic waste products are larger in amount bacterial growth will be lower.

4)Acidity: Optimum pH for bacterial growth is around 6.5 to 7.0.In acidic condition bacteria growth decreases exceptions are acidophiles.