Microbial Metabolism Microbial nutrients, growth and cultivation
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1 1 Microbial Metabolism Microbial nutrients, growth and cultivation Ching-Tsan Huang ( 黃慶璨 ) Office: Agronomy Hall, Room 111 Tel: (02) cthuang@ntu.edu.tw
2 2 Microbial Nutrition Purpose To obtain energy and construct new cellular components Nutrient Requirement The major elements: C, O, H, N, S, P The minor elements: K, Ca, Mg, Fe The trace elements: Mn, Zn, Co, Mo, Ni, Cu
3 Source and Functions of Elements in Bacteria 3 Element %/D.W. Source Function C 50 O 20 N 14 H 8 Organic compounds or CO 2 H 2 O, O 2, CO 2 and organic compounds NH 3, NO 3, N 2, organic compounds H 2 O, organic compounds, H 2 Main constituent of cellular material Constituent of cell material and cell water; O 2 is electron acceptor in aerobic respiration Constituent of amino acids, nucleic acids, nucleotides, and coenzymes Main constituent of organic compounds and cell water P 3 Inorganic phosphate Constituent of nucleic acids, nucleotides, phospholipids, LPS, techoic acid S 1 SO 4, H 2 S, S, organic sulfur compounds Constituent of cysteine, methionine, glutathione, several coenzyme K 1 Potassium salts Mg 0.5 Magnesium salt Ca 0.5 Calcium salts Fe 0.2 Iron salts Main cellular inorganic cation and cofactors for certain enzymes Inorganic cellular cation, cofactor for certain enzymatic reactions Inorganic cellular cation, cofactor for certain enzymes and a compound of endospores Component of cytochromes and certain nonheme iron-proteins and cofactors for enzymatic reactions
4 4 Requirements for C, H and O C, H and O Serve as the skeleton and backbone of all organic molecules Prefix, Affix and Suffix Trophs Auto- (CO 2 ) vs Hetero- (organic matters) Proto- vs Auxo- (nutrient deficient) Photo- (light) vs Chemo- (oxidation) Litho- (inorganic) vs Organo- (organic)
5 5 Requirements for N, P and S Nitrogen for the synthesis of amino acids, purines, pyrimidines, enzyme cofactors and other substances Phosphur for the synthesis of nucleic acids, phospholipids, nucleotides, cofactors, some proteins and other cellular components Sulfur for the synthesis of cysteine, methionine, biotin, thiamine and some carbohydrates
6 6 Functions of Vitamins in Microbes Vitamin Biotin Cyanocobalamin (B 12 ) Folic acid Lipoic acid Pantothenic acid Pyridoxine (B 6 ) Niacin (Nicotinic acid) Riboflavin (B 2 ) Thiamine (B 1 ) Function Caroxylation (CO 2 fixation), 1-C metabolism Molecular rearrangements 1-C metabolism (carries methyl groups) 1-C metabolism Transfer of acyl groups Precursor of Co-A (carries acyl groups) Amino acid metabolism Precursor of NAD and NADP (carry electrons and hydrogen atoms) Precusor of FAD and FMN (carry electrons or hydrogen atoms) Aldehyde group transfer
7 Nutrient Transport Mechanisms Passive Diffusion From high to low concentration Diffusion rate is dependent on the size of the concentration gradient H 2 O, O 2 and CO 2 often move across membrane by passive diffusion Facilitated Diffusion Using carrier proteins (permeases) Concentration gradients drive the movement of molecules No energy input required Active Transport Transport against a concentration gradient Metabolic energy input required 7
8 8 Growth Curve in Batch Culture Constant viable cell number Constant growth rate most uniform population Decline in population size To replenish and to adapt
9 9 Generation Time GT = t log 2 log b log B
10 X 2X dx dt X dx dt = μx dx X = μdt ln X = μt X = e μt 10 As X = 2X 0 ln 2X 0 X 0 = μt GT = t = ln 2 μ
11 11 Stationary Phase What metabolically active cells stop reproducing reproductive rate is balanced by death rate Why nutrient limitation limited oxygen availability toxic waste accumulation critical population density reached Starvation Response Morphological change Decrease in cell size Production of starvation proteins
12 Nutrient Concentration on Growth 12
13 13 Reactor Design Balance equation Net rate of Accumulation = Net rate of input by transport + Net rate of production by transformation Mass balance Batch culture Continuous Stirred Tank Reactor (CSTR); Chemostat Plug Flow Reactor (PFR)
14 14 Mass Balance Batch culture Well-mixed; No input or out put (Q = 0) dc V dt = V r V C: concentration (mass L -3 ) r: conversion rate (mass L -3 time -1 )
15 15 Continuous Culture Continuously Stirred Tank Reactor (CSTR) Chemostat Well-mixed; Q in = Q out ; no gradient dc V dt = Q (C i C) + V r Q in C in Q out at Steady State C, V Q: flow rate (L 3 time -1 ) C: concentration (mass L -3 ) r: conversion rate (mass L -3 time -1 ) dc dt = 0 Q V (C i C) = -r D: dilution rate (time -1 ) : 1/D, residence time
16 16 dc V dt = Q (C i C) + V r r = X growth rate 0 if sterile feeding 0 at steady state dc Q dx = (C i C) + r dt V = ( -D) X dt
17 17 Microbial Culture Media Synthetic media Media in which all components are known Complex media Media that contain some ingredients of unknown chemical composition Selective media Media that favor the growth of specific microbes Differential media Media that distinguish between groups of microorganisms based on differences in their growth and metabolic products
18 18 Carbon Choice Metabolic flux Some pathways conflict if run simultaneously Different carbon degraded differently DNA regulation Competition is stiff Diauxic growth Growth in two phases Utilize one carbon source first Utilize the second one until the first one depleted Resulted from inducible enzyme synthesis
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