Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading content…
Transcript

The Effect of Different Types of Light on Bacteria

By Sydney Snyder and Nikita Jagdish

Block 7

04/10/15

Objective

Procedure

  • Cover the inside of 9 petri dishes, that already have agar in them, with a coat of bacteria, using the inoculating loop. Wear gloves while doing this and dispose of the inoculating loop when completed. Place all the lids back on the petri dishes as you go and remember to label each one with the marker.
  • Place 3 of the petri dishes in a small box and close the top. Make sure there are no holes in the box. This box is the control group, which will be receiving no light.
  • Cut a circle in the top of the other box and place 3 petri dishes inside. Use the fluorescent light source and shine it directly above the hole of the box. Make sure the bulb isn’t touching anything to ensure safety.
  • Put the remaining 3 petri dishes in each of the cups and shine an incandescent light on over each of the cups. Make sure the bulb isn’t touching anything to ensure safety.
  • Check and record the temperatures of each group of bacteria.
  • Check the petri dishes daily and record data in the form of pictures.

Materials

  • bacteria
  • 9 petri dishes with agar
  • 2 small boxes
  • permanent marker
  • 1 fluorescent light source
  • 3 incandescent light sources
  • 3 plastic cups
  • scissors
  • 1 inoculating loop
  • gloves
  • thermometer

Hypothesis

If we design an experiment in which bacteria is observed fluorescent, incandescent, and no light, the bacteria under the incandescent light will grow the fastest.

The purpose of this study was to investigate how different types of light would affect bacterial growth. The independent variables are the different types of light. The dependent variable is the amount of bacterial growth.

Conclusion

Our data supported our hypothesis since the bacteria under the incandescent lights grew the most. The reason for this might have been because of the increased temperature. Bacterial growth seems to be affected by how much energy the light is giving off. The incandescent lights were both brighter and hotter. Many studies have found that brighter lights cause the bacteria to grow slower, but the heat makes it grow faster. Our project would've been more accurate if all the petri dishes were under the same temperature and the bacteria was spread more evenly. We found that the hotter and brighter light will cause the bacteria to grow faster. This information can be used to manipulate bacteria into growing faster or not growing at all. New experiments can be done to find how different colors and wavelengths of light affect bacterial growth.

Results

Works Cited

Anonymous. “Early Detection of Food Described.” United Press International, Inc. 12 Apr. 2011: n. pag. Science Online.Web. 2 Nov. 2014. <http://www.fofweb.com/Science/LowerFrame.asp?SID=5&iPin=UPI-1-20110412-193906-bc-canada-bacteriahunt&rID=12&InputText=light+bacteria&SearchStyle=Keyword&RecType=News+Article&CurTab=All&RecCountVal=1&TopTermPrincCount=550&BioCount=36&ExpActCount=0&ImgCount=4&NwsCount=57>.

Anonymous. "Growth of Bacterial Population." Encyclopedia Britannica. Encyclopedia

Britannica, 2014. Web. 3 Nov. 2014. <http://www.britannica.com/EBchecked/

topic/48203/bacteria/272364/Growth-of-bacterial-populations>.

Anonymous. "Light May Help Bacteria Invade Produce." United Press International 29

Sept. 2009: n. pag. Science Online. Web. 2 Nov. 2014.

<http://www.fofweb.com/Science/LowerFrame.asp?SID=5&iPin=UPI-1-20090929-135049-bc-israel-producegerms&rID=3&InputText=light+bacteria&SearchStyle=Keyword&RecType=News+Article&CurTab=All&RecCountVal=1&TopTermPrincCount=550&BioCount=36&ExpActCount=0&ImgCount=4&NwsCount=57>.

Anonymous. "What Wavelength Goes with a Color?" Ed. Jay Madigan. S'COOL. Ed. Jay

Madigan. USA.gov, 15 Nov. 2011. Web. 3 Nov. 2014.

<http://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html>

Lindell, Mans J., H. Wilhelm Graneli, and Lars J. Tranvik. Effects of Sunlight

on Bacterial Growth in Lakes of Different Humic Content. Research rept. no.

11. Lund: Inter-Research, 1996. Print. Aquatic Microbial Ecology.

Results

Introduction

  • brighter lights produce more light and heat energy (S'COOL 2011)
  • the amount of light stays the same but the amount of heat can change (Encyclopedia Britannica 2014)
  • bacteria in lakes that are closer to the surface grow slower because the UV radiation from the sun causes them to decay (Inter-Research 1996)
Learn more about creating dynamic, engaging presentations with Prezi