Optimum Growth Temperature for Streptococcus epidermidis Katy Essay

Optimum Progress Temperature for Streptococcus epidermidis

Katy Dangal, Candis Barrientez, Angie Wright

Trainer: Dr. Dakota Jackson



Usually as soon as we heard the phrase micro organism, we take into account it as one factor harmful nonetheless genuinely, the micro organism may very well be every constructive and detrimental which can have giant affect on our physique and setting. Completely totally different micro organism have an optimum progress temperature. We wished to try staphylococcus epidermidis and uncover out what it’s optimum progress temperatures, so we grew S. epidermidis in three temperature (20 °C, 40 °C, 60°C) which was chilly, cheap and extreme.

After the data was collected, we plotted these info on graph and consider the absorbance stage at each temperature. The graph consequence reveals that the S. epidermidis grew the proper spherical 40 °C which was closed to human physique temperature.


Cell is the smallest unit of life and all of acknowledged life on earth fall into three utterly totally different space which might be Archaea, Micro organism and Eukarya. Any organism in Archaea and micro organism are known as prokaryotes and any organism in Eukarya are known as eukaryotic.

Prokaryotic and eukaryotic share lot of similarities and variations between them. Every the prokaryotic and eukaryotic are composed of cell by which each cell encircle by cell membrane they normally every even have ribosomes. The prokaryotic cell reproduce by way of the tactic of cell division which often known as the binary fission whereas eukaryotic cell used a particular technique of cell division which I known as mitosis which included cell cycle of progress and enchancment. Staphylococcus epidermidis is a Gram-positive bacterium, and epidermidis is one in every of over 40 species which belong to the genus Staphylococcus. This bacterium is usually found on human pores and pores and skin, and whereas sometimes harmless, S. epidermidis has the potential to set off a lot of undesirable indicators in us. S. epidermidis could be constructive to human physique on account of they might assist us protect from totally different harmful micro organism like staphylococcus aureus which can set off pores and pores and skin an an infection. Are you aware that Staphylococcus can be utilized to make biofilms which is used on surgical process and loads of totally different procedures? That’s the reason it is important for us to know what setting influence their progress and what don’t. (Pavlovsky 2015). The intention of conducing this experiment was to hunt out out the optimum progress temperature of staphylococcus epidermidis. There was the identical experiment which was carried out by Ketter 2018 by which they’d been ready to learn the way blood platelets may very well be saved whereas stopping S. epidermidis from rising on it. Whereas engaged on it as well as they uncover out that the temperature play important perform on S. epidermidis progress. We perfume this experiment whereas using an article as a reference by which they take a look at utterly totally different pH ranges and temperatures. (Stavropoulous 2018) For this experiment, three utterly totally different temperatures had been chosen which was extreme, low, and cheap temperatures. The rationale these temperatures had been chosen was on account of micro organism can develop on extreme temperatures which can very nicely be terribly chilly or scorching, so we wished to know which temperature could be ideally suited to rising staphylococcus epidermidis.


This experiment was carried out inside the TCC Science lab beneath lab trainer supervision. The experiment started with 250 mL of preheated up to date sterile TSB media after which we change 4mL of media right into a model new cuvette. This new cuvette with 4Ml of media was used as a clear for this experiment. As quickly because the clear was made, we then change 10 mL of in a single day custom S. Epidermidis to the rest of preheated up to date preheated sterile media. We then change the 4 mL of inoculated broth to scrub cuvette and measure it’s absorbance by inserting it into spectrometer which was blanked and set at 650 nm. We measure the absorbance at time zero to 20-minute gap to recheck the micro organism progress. Subsequent, we positioned the remaining custom in water tub and setting at 20? for 20 minutes. The absorbance was measure from time zero to every 20 minus which took full of 80 minutes for each temperature. We had three trials at each temperature by which we repeated this course of on all three of our temperature which was 20°C, 40°C, and 60°C. As quickly as we collected all the data, we then calculated the everyday absorbance finding out from three trials of each temperature. We then plotted that info and created a line graph which reveals absorbance finding out of all three temperature.


As we had been conducting the experiment, we purchased to see the perfect absorbance spherical 40°C.

Desk 1: Widespread absorbance at 20°C, 40°C, and 60°C.

Time (min) Absorbance 20°C Absorbance 40°C Absorbance 60°C.

zero zero.000 zero.000 zero.000

20 zero.106 zero.297 zero.204

40 zero.105 zero.310 zero.137

60 zero.101 zero.334 zero.075

80 zero.112 zero.400 zero.123



Whereas consequence we as a bunch acquired right here to conclusion that the optimum progress temperature for staphylococcus epidermidis is 40°C. We observed the perfect absorbance finding out at 40°C as we had been anticipating to see. Our info current similarity with totally different experiment which was carried out by Stavropoulous 2018 by which they acquired right here to conclusion that micro organism need have optimum progress on explicit temperature. Which indicate the temperature 20°C was too chilly for them nonetheless we had been shocked to know that they did have progress on 60°C. Matter of actuality they grew properly on first 20 minutes of 60°C which you can see on graph above. The absorbance did went down after the first 20 minutes. Which indicate the 60°C was too warmth for S. dermis to develop. Nonetheless this shocking info made me keep in mind one factor which was that there are some micro organism that are prone to survive on extreme temperature as properly.