#experimet

[first drawing of it!!]

Sourdough - 

I love to bake - cakes, cookies, pie’s but never tried to make sourdough bread. Had never a clue or motivation to give it a try. So here we are at the moment where I tested 3 different experiments. 

1. 1:1 water/ flour -> without a cloth on top (did nothing and it’s to much water)

2. 1:1 water/ flour -> with a cloth on top (was to dry + mold)

3. On intuition water/ flour -> with a cloth on top and keep it in a warm place like the oven (works!)

Here is a picture form number experiment number 1&3:

Photo 1 = First start

Photo 2 = 1&3 to see the difference

Photo 3 = sourdough starter :)

Introducing bacteria to the petri dishes.

Once the agar solution has hardened and the petri dishes are at room temperature you’re able to introduce the bacteria. There a couple of methods of doing this - through direct contact or through sample collection.

Direct contact: This is when bacteria is transferred to the petri dish using direct contact, i.e. touching the agar. One of the most common ways of doing this is to simply press your fingertip lightly onto the surface of the agar. However, you could also try pressing a fingernail or the surface of an old coin into the agar, or even placing a small hair or drop of milk into the dish.

Sample collection: With this method, you can collect bacteria from almost any surface and transfer it to the petri dish, all you need are some clean cotton swabs. Simply grab a swab and swipe it over of any surface you can think of - the inside of your mouth, a door handle, the keys on your computer keyboard or the buttons of your remote control - then use it streak the surface of the agar. These places harbor a lot of bacteria, and should provide some interesting (and disgusting) results in a couple days time.

Ejercicio de Técnicas Compositivas. Modificaciones genéticas.