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Science Fair edited research plan science fair 2011.doc {jenny zack- bacterica science fair.ppt} ience Fair Experimen…

research plan science fair 2011.doc
{jenny zack- bacterica science fair.ppt} ience Fair Experiment Journal
1/6/2012
Jenny Zack
First, I made a tape square on the surface of the table in the science lab. I then made multiple bacterial handprints within that square to let it sit for the weekend and see how time affects it. After, I repeatedly touched the agar in the petri dish and used a cotton swab to spread it around. I did this three times and sealed all of the petri dishes with tape. I then labeled either “control 1”, “control 2”, or “control 3”. Next, I made bacterial handprints on the table’s surface and sprayed the table with antibacterial cleaner. I then wiped it with a paper towel and took three swabs. I spread each swab around on a different petri dish, four in total. Then, I sealed them with tape and labeled them either “antibacterial 1”, “antibacterial 2”, or “antibacterial 3”. Following this, I made more bacterial handprints on a different part of the table and wiped a mouthwash soaked paper towel on it. I then took three swabs and spread them each on a different petri dish. After, I sealed them with tape and labeled each either “mouthwash 1”, “mouthwash 2”, or “mouthwash 3”. Lastly, I placed all nine petri dishes in the incubator.
Bacteria: The temperature of the incubator was 26 degrees Celcuis.
1/9/12Lasting Fingerprint
Jenny Zack
First, I took all nine petri dishes out of the incubator. I then looked at each petri dish and recorded the amount of bacterial colonies, and the amount of different colors in each. After, I put the petri dishes in the fridge. There was no distinct difference in the amount of bacteria in the control samples, the antibacterial samples, or the mouthwash samples. The only noticeable difference was the higher diversity of bacterial colonies in all of the control samples. Next, I took three swabs of the bacterial handprints within the square, and I spread them on three different petri dishes. I sealed them with tape and labeled them either “time 1”, “time 2”, or “time 3”. I then put them in the incubator. The temperature of the incubator was 26 degrees Celsius.
1/12/12
Jenny Zack
I took the “time” petri dishes out of the incubator. Before I took them out, the incubator was 26 degrees Celsius inside. I then examined them and counted the number of bacterial colonies, along with the different types of bacterial colonies based on color. The three “time” samples had the most bacterial growth out of each of the other samples. However, the sample contained the least diversity in bacterial colonies. After I examined the petri dishes, I put them in the fridge to preserve them.
Abstract
The purpose of this experiment was to determine how durable bacterial handprints can be at crime scenes. Fingerprints, although helpful in identifying suspects, can simply be wiped away with a cloth. Bacteria, however, is also helpful in identifying suspects and, depending on this experiment, can prove more durable at crime scenes. Mouthwash and anti-bacterial cleaner, common bacteria killing supplies, were used to wipe away the bacterial handprints. Also, some bacteria were left alone for three days to determine if time has an effect on their growth and sustenance. During experimentation, bacterial handprints were made and wiped with either mouthwash or anti-bacterial cleaner. These samples were then swabbed and put in Petri dishes to incubate. Also, a bacterial handprint unaffected by the three factors was swabbed, put in Petri dishes to incubate, and used as the control. Lastly, one bacterial handprint was left for three days, swabbed, and put in Petri dishes to incubate. After the bacteria was fully grown and counted, it was seen that the time trials had the most amount of bacteria left. This was followed by the control trials, the mouthwash trials, then the anti-bacterial trials. Except for the time trial’s large count of bacteria, all other trials were comparable in numbers. The control’s trials contained the most diversity in bacterial colony types. From these results, it can be concluded that bacteria is more durable than a fingerprint, and as time goes on bacteria grows and becomes more useful in identifying suspects, while fingerprints remain the same.{research plan science fair 2011.doc}
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{Science Fair Experiment Journal.doc}
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Scienceience Fair Experiment
1/6/2012
Jenny Zack

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