Microbes

Science — First Preparatory

Applications and examples from life

Comparison aspect	Main idea	Example	Keywords
Effect of conditions on food	we leave a slice of bread uncovered in a warm place and after several days microbes grow on it. We compare it with a slice sealed in a bag. This shows that microbes need moisture warmth and food to grow	—	leaveslicebreaduncovered
Pasteurisation	liquid foods	milk are heated to a set temperature for a short time which kills most harmful microbes without greatly changing their taste or nutritional value	liquidfoodsmilkheated
Rapid growth calculation	a certain bacterium divides every 20 minutes. Starting with one cell, after 1 hour there are 60 ÷ 20 = 3 divisions, giving 2³ = 8 cells. After 2 hours there are 6 divisions, giving 2⁶ = 64 cells. After 3 hours there are 9 divisions, giving 2⁹ = 512 cells.	—	certainbacteriumdividesevery

Microbes · 4 / 6