Jenny Zack Grade 9.  The problem addressed in this experiment was whether or not bacteria can be used to identify suspects in a crime scene.

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Presentation transcript:

Jenny Zack Grade 9

 The problem addressed in this experiment was whether or not bacteria can be used to identify suspects in a crime scene.

 Forensic scientist can use bacteria to identify suspects  Fingerprints are extremely easy to get rid of  Staphylococcus, Corynebacteria, Streptococcus, Escherichia coli, Myobacteria, and Haemophilus  Microbiome

 If the bacteria are treated with antibacterial cleaner and mouthwash, then they will be ineffective as identifiers.  If the bacteria are left out for three days, then they will multiply, and can be used as identifiers.

 12 Petri dishes  Tryptic soy agar  Easy Gel coliscan  18 sterile cotton swabs  3 Inoculating loops  Antibacterial cleaner  Mouthwash  Paper towels  Sterile surface  Incubator

 First, I made a tape square on the surface of a table. I then made multiple bacterial handprints within that square to let it sit for the weekend and see how time affects it.  Next, I made a bacterial handprint on a table’s surface and sprayed the table with antibacterial cleaner. I then wiped it with a paper towel and took three samples.  For the mouthwash group, this routine was repeated, but I wiped the bacterial handprint with mouthwash.  When making the control samples, I made a bacterial handprint and took three samples without treating it with anything.  For time, the same process was repeated, however the bacteria was allowed 3 days to sit prior to testing.  Lastly, I placed all nine petri dishes in the incubator at 26 degrees Celsius.  All petri dishes were taken out of the incubator after 3 days of growth.  When examining the samples, I counted the # of colonies and colony types. I distinguished colony types by color.  After I examined the petri dishes, I put them in the fridge to preserve them.

 The hypothesis was partially supported because despite the use of the antibacterial products and mouthwash, bacterial growth was comparable to the control samples.  Also, bacterial growth was greater in the time samples than the control.  Given the results it is inconclusive whether or not these bacterial handprints can be used to identify suspects

 “Growing Bacteria.” Science Enterprises. N.p., n.d. Web. 29 Sept  HomeScience. “How to Grow Bacteria.” Youtube. N.p., 15 Feb Web. 29 Sept  “Human Skin Has Many More Types of Bacteria than Previously Thought.” Medical News Today. MedPage Today Professional, Web. 25 Jan  Madrigal, Alexis. “Your Leaving a Bacterial Fingerprint on Your Keyboard.” Wired. Conde Nast Digital, Web. 29 Sept  Martinez, Edecio. “Your Germs Might Be as Unique as Your Fingerprints.” CBSNews. CBS Interactive Inc., Web. 29 Sept  “Telltale Bacteria.” The Engineer. Centaur Media plc, Web. 26 Sept Thank you to everyone in the audience for listening to my presentation! I would be happy to answer any questions you may have about my project!