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In Which Conditions Do Bacteria Grow In Best?

Presentation for Mr. B's class

Anbar Y.

on 18 December 2010

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Transcript of In Which Conditions Do Bacteria Grow In Best?

In What Conditions Do Bacteria Grow In Best? TEAM IBAK Shall we begin? in what environment does bacteria grow in best? we will soon find out... First, what is bacteria? bacteria is Very small living organisms made of only one cell; present everywhere Throughout this presentation, we will be discussing the ideal conditions for bacteria growth and why it is important to know. Now, what did we think would hapen? We predicted that mold would grow slower in colder temperatures than the mold in warmer temperatures but in dark and moist areas. After analyzing our results, we reached the conclusion that our hypothesis is correct. what did other scientists find? Pervious research states that:
They do best in a warm, moist, protein-rich environment that is pH neutral or low acid.
some thrive in extreme heat or cold.
Some can survive under highly acidic or extremely salty conditions. But, where can we use this? The food industry.
helpful and serves useful functions such as causing breads to rise, fermenting sugars to alcohol, assisting in the production of cheese from milk, and decaying organic matter to replenish nutrients in the soil.
can also cause foods to spoil and make them inedible. Spoilage organisms cost the food industry millions of dollars each year.
can also be harmful., called pathogens.
cause between 24 to 81 million cases of foodborne illness in the U.S. each year. How did we do this? Hot agar was pour into twelve petri dishes and allowed to cool. the petri dishes were separated and placed in three different spots in the room: the front counter, the window, and the back corner. Each dish was allowed to sit in there designated space for 24 hours without its cover. The next day, one of the petri dishes from each area was placed in its permanent area. Three petri dishes in the incubator, refridgerator, freezer, and at room temperature. What happened? DAY 1
Uncontrolled Freezer Refridgerator Incubator Room
Temperature Day 7
Controlled Freezer Refridgerator Incubator Room
tEMPERATURE WHY DID IT HAPPEN? warm temperatures are better for microbial growth
Most of the time, when temperatures become cooler, the metabolism (its ability to maintain life functions) of the microbes slows.
Bacteria does not need light to reproduce unlike plants.
Any extreme sun or light may actually hinder the process of growth for bacteria.
Also, molds produces spores to reproduce. These spores act like seeds, and molds will grow and multiply if the conditions are right, such as in the dark, moist places and on organic materials Did Anything go Wrong? In the first part of the experiment, the agar dried up
causing us to control the light and humididty variable.
This allowed us to see how much those variables
affected th growth of bacteria. THE END.
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