Monday, 9 June 2014

Day 3- Reflection

-        Plenary Sessions    

     1. 3D printing is very useful in many ways
     2. It is used in reconstructing body parts body parts

-        How do you feel about the SST-NTU Flagship programme?

I find this programme very meaningful and I have learnt a lot about bacteria and about 3D printing. I learnt that not all bacteria are harmful and how do we identify bacteria. I feel that this programme should be continued for the other batches of secondary 2.

Wednesday, 4 June 2014

Day 2 - Reflections

What did you do today? 

We got back the agar that we made yesterday and we are supposed to interpret results. The different agars contain different substances which only allows some type of bacteria to grow on such as the MacConkey Agar (MAC) only allows gram-negative bacteria to grow. As for the agar that are in tubes, there was no bacteria on all of the samples except 1. I feel that it was because we did not smear it properly and hence we did not see any bacteria growth. We also get to use the microscope to see the different specimens.

What have you learnt today?

I learnt the different functions of the different agar, such as what kind of bacteria is able to grow on it.  I also learnt how to operate a microscope properly.

3. How do you feel about today's activity?
I feel that today's activity made me think differently about bacteria. I never thought that it could spread so rapidly. It was able to form huge colonies in just 24 hours. I also know how they identify bacteria, first they inoculate it in different agar and look at the results. This way they could identify it's traits and will be able to name which baxter that is.

Tuesday, 3 June 2014

Day 1- Reflections

1. What did you do today?

We went all over the school and use a cotton swab to take samples from a tray and inoculate in different agars to see how they spread. We only smear the samples taken on half of the agar because the other half of the agar is used as a control. We also done the same thing in different places to compare how dirty it is. Unfortunately we got to wait for 1 day to see the results because we need to wait for the bacteria to start breeding

2. What did you learn today?

I learnt how to smear the cotton swab over the agar which you must smear it in a zig-zag shape. You also cannot apply too much pressure on the agar. 

3. How do you feel about today's activity?

I feel that today's activity was a pretty enjoyable one. I had a lot of fun going all over the school and swabbing the different places and I hope that tomorrow I will see that the bacteria breed and know which places are the dirtiest


What are bacteria? List down some characteristics of bacteria

Bacteria are tiny single-cell microorganisms, usually a few micrometers in length that normally exist together in millions.
They come in 3 main shapes:
  • Spiral 

  • Rod

  • Sphere

How to identify bacteria?

  • Gram Staining
  • Ziehl-Neelsen Staining.
  • Genetic testing

Name 3 common bacteria and places where they are commonly found.

Staphylococcus epidermidis 
most frequent organism found in the blood of bone marrow transplant patients and on central venous catheters for patients of total parenteral nutrition
Vibrio cholerae
The cholera bacterium is usually found in water or food sources that have been contaminated by feces from a person infected with cholera. Cholera is most likely to be found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene.

Are all bacteria harmful to humans? if not, list down some species.

No, Lactobacillus, Bifidobacterium and Bifidobacterium are not harmful to the human body.