BIO 214 Lecture Notes - Lecture 8: Organic Compound, Glycerol, Membrane Transport Protein

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5 Feb 2017

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Lecture 10
Dr. Fan
January 2nd, 2017
Microbial Growth and Nutrition
Increase in cellular constituents that may results in…
Increase in cell number
Increase in cell size
Example: when microorganisms reproduce
Microbiologists usually study population growth rather than growth of
individual cells
Common Nutrient Requirements
AKA macronutrients
Carbon, oxygen, hydrogen, nitrogen, sulfur, phosphorous,
potassium, calcium, magnesium, and iron
Required in relatively large amounts
AKA trace elements
Manganese, zinc, cobalt, molybdenum, nickel, copper
Required in trace amounts (small)
Often supplies in water or media components
Bacteria are composed of different elements and molecules
With water 70% and proteins 15% being the most abundant of the
Growth Factors
Essential organic nutrients
Many bacteria lack the genetic and metabolic mechanism to
synthesize every organic compound needed for survival
Can not synthesize all nutrients by itself
Recall: bacteria are called free-living organisms
Not synthesized by the microbe and must be supplemented
Example: amino acids, vitamins
Uptake of Nutrients by the Cell
Some nutrients enter by passive diffusion
Passive transport moves across a concentration gradient, or a
gradual difference in solute concentration between two areas
Most nutrients enter by…
Facilitated diffusion
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