study of growth of mold (students presentation) · 2018-05-10 · study of growth of mold...
TRANSCRIPT
![Page 1: Study of growth of mold (Students Presentation) · 2018-05-10 · Study of growth of mold (Students’ Presentation) Objective • To culture bread mould • Compare the growth of](https://reader033.vdocuments.us/reader033/viewer/2022060405/5f0f38ce7e708231d443175d/html5/thumbnails/1.jpg)
Study of growth of mold(Students’ Presentation)
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Objective• To culture bread mould• Compare the growth of mold under
different conditions• Compare the growth of bread mold
when different mediums (sweet bread /plain bread) are provided.
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Introduction• 10 samples and 2 controls are included.• 10 samples: 5 pieces of sweet bread and 5
pieces of plain bread• On the bread pieces, we swapped microbes
from different places to see what kinds of fungus will appear on which of the samples.
• 2 controls: a control sample for each: sweet and plain bread
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Swapped microbes from different places:
Treatments of Sample Sweet bread Plain breadNone Control
sample 1Control sample 2
Soil Sample 1 Sample 2Spoiled food Sample 3 Sample 4Ventilation duct Sample 5 Sample 6Shoe base Sample 7 Sample 8Rubbish bin Sample 9 Sample 10
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Type of bread used Sweet breadMethod of samplingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample NoTreatment of sample? In shaded area
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Control sample 1Day 7
White mold appeared.
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Type of bread used plain breadMethod of samplingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample NoTreatment of sample? In shaded area
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Control Sample 2Day 7
Mold appeared!A blue spot
A green spot
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Type of bread used Sweet breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample SoilTreatment of sample? In shaded area
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Sample 1Day 7
White moldWhite mold
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A green spotWhite mold
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Type of bread used Plain breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample SoilTreatment of sample? In shaded area
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Sample 2Day 4
Yellow mold
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Sample 2Day 5
Blue mould Black mould
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Sample 2Day 6
A blue spot
White mould
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Sample 2Day 7
Front BackA green spot A blue spot
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Sample 2
• became dry and hard after the seven-day experiment as water is absorbed by the mold.
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Type of bread used Sweet breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample Spoiled foodTreatment of sample? In shaded area
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Sample 3Day 2
Yellow mold
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Sample 3Day 3
The yellow mold spread.
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Sample 3Day 6
The yellow mold became deeperin color.
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Sample 3Day 7
Little orange spots
New mold appeared!
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Type of bread used plain breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample Spoiled foodTreatment of sample? In shaded area
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Sample 4Day 6
White mold( small amounts)
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Sample 4Day 7
Blue spots
White mold
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Type of bread used Sweet breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collectedthe sample
ventilation duct
Treatment of sample? In shaded area
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Sample 5Day 5
A green spot mold appeared
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Sample 5Day 6
The green spot became larger
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Sample 5Day 7
Mold becomes larger.
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Type of bread used plain breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample
ventilation duct
Treatment of sample? In shaded area
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Sample 6Day 6
A blue spotMold appeared!
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Type of bread used Sweet breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample Shoe baseTreatment of sample? In shaded area
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Sample 7Day 7
White mold( small amounts)
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Type of bread used plain breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample Shoe baseTreatment of sample? In shaded area
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Sample 8Day 3
Mold appeared!Black spots
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Sample 8Day 6
Black spotsBlue spots
White mold
More mold appeared.
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Sample 8Day 7 Green spots
Blue spots
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Sample 8
• became dry and hard after the seven-day experiment as water is absorbed by the mold.
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Type of bread used Sweet breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample rubbish binTreatment of sample? In shaded area
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Sample 9Day 7
Green mold
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Type of bread used plain breadMethod of sampling scrapingAny moisture added? Water
VentilationWith the zip bag opened a quarter
Place we collected the sample rubbish binTreatment of sample? In shaded area
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Sample 10Day 7
Remains unchanged.
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ResultsSweet bread
Sample Treatment of sample
No. of Days for mold to appear
No. of Days for odor to appear
Colour of fungus
Control sample
1 7 5 WhiteSample 1 Soil
7 5green, white
Sample 3 Spoiled food 7 4 Yellow, orange Sample 5 Ventilation duct
6 5 green Sample 7 Shoe base
7 5 WhiteSample 9 Rubbish bin 7 5 Green
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Plain breadSample Treatment
of sample
No. of Days for mold to appear
No. of Days for odor to appear
Colour of fungus
Control sample 2 7 5 green, blue
Sample 2 Soil
4 5
Yellow, BlackBlue,green, white
Sample 4 Spoiled food6 4
White, Blue
Sample 6 Ventilation duct 6 5 blue
Sample 8 Shoe base
4 5
Green, BlackBlue, GreenWhite
Sample 10 Rubbish bin --- 5 ---
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Results• Sample 2 and Sample 8 became dry and
hard after the seven day experiment as water is absorbed by the mold.
• The white and yellow mold grew through spreading and do not have a regular shape, while mold of other colors (Black, blue, green, yellow, etc.) are spots.
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Different Kinds of Fungi in the samples
Sample Type of Fungus Control Sample (1-2) Aspergillus oryzae
Sample 1 & 2 (soil)Aspergillus clavatus , Acremonium sp. AndCladosporium
Sample 3 & 4 (spoiled food) Aspergillus flavusSample 5 & 6 (ventilation duct) Aspergillus penicilloides
Sample 7 & 8 (shoe base) Aspergillus clavatus and Cladosporium
Sample 9 & 10 (rubbish bin) Rhizopus
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The growth of mold in seven days
Sample No. Day1 Day2 Day3 Day4 Day5 Day6 Day7
Control Sample 1
White
A green spotControl Sample 2
A blue spot
WhiteSample 1
A green spot
Black White
Blue A blue spot
Sample 3 Yellow Spread of yellow mold
The yellow mold became deeper in color
Little orange spots
White( more)Sample 4 White( small amounts)
Blue spots
Sample 5 A green spot
The green spot became larger
Green spot
Sample 6 A blue spot Blue spots
Sample 7 White( small amounts)
White Yellow
Blue spots Green spots
Black spots
Sample 9 Green (not a spot)
Sample 10 No observable change
Sample 8 Black spots
Mold appeared at the back of the sample( a green and a blue spot)
Sample 2 Yellow
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Sweet bread Plain bread
Treatment of sample
Colour of fungus Colour of fungus
Nil White green, blueSoil
green, whiteYellow, Black
Blue, green, white
Spoiled food Yellow, orange White, Blue Ventilation
duct green blue
Shoe baseWhite
Green, BlackBlue, green, white
Rubbish bin Green ---
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Sample Type of Fungus Control Sample (1-2) Aspergillus oryzae
Sample 1 & 2 (soil)Aspergillus clavatus , Acremonium sp. AndCladosporium
Sample 3 & 4 (spoilt food) aspergillus flavusSample 5 & 6 (ventilation duct) Aspergillus penicilloides
Sample 7 & 8 (shoe base) Aspergillus clavatus and Cladosporium
Sample 9 & 10 (rubbish bin) Rhizopus
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Analysis
• Different colors of moulds represents different species of fungi. From the above table, we can see that
• more species of fungi grow on plain bread when other conditions remain the same.
• more species of fungi grow when soil is scraped onto the bread
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Analysis
• Soil contains the largest number of fungi species( including Aspergillusclavatus , Acremonium sp. and Cladosporium ) when comparing with the other four conditions.
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Sweet bread and plain bread
The plain bread provides a better medium than sweet bread for the growth of microbes.
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Different Conditions
• Soil provides the best living condition for the growth of miscrobes of the five conditions we tested (Soil, spoiled food, ventilation duct, shoe base and rubbish bin)
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Links• http://www.moldremoval.com/html/m
old_types.htm• http://home.pacific.net.hk/~ppleung/
Chem/common%20mould%20on%20bread.htm
• http://en.wikipedia.org/wiki/Mold