pictures

here are some of the pics of the 3M Quick Swab and the bacteria colonies (cfu- colony forming unit).

Each red dot represents one cfu.

:s

ok so im rushing to do my report while doing this.. but it turns out there were no human errors (as i thought earlier with the UHT milk) because if there were then the bacteria count would be much greater than 1. btw ill be back on later to post some pictures :)

variation in results

the variation in the results of the different types of milk are to be expected as there are very different pasteurization processes involved. The average of the lite milk bacterial count and the full cream milk bacterial count are similar due to the similar pasteurization process, while the UHT milk is heated at high temperatures to kill the majority of bacteria.

also, there may have been some small, slight error while pouring the dilution onto the petri film for UHT resulting in a bacterial count higher in a dilution compared to pur UHT milk.

results

ok, so i finally finished doing the actual experiment. Here are the results:

LITE MILK- 1

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	125
2	1/9	59
3	1/27	21
4	1/81	9

LITE MILK- 2

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	48
2	1/9	29
3	1/27	4
4	1/81	9

FULL CREAM MILK- 1

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	57
2	1/9	26
3	1/27	13
4	1/81	8

FULL CREAM MILK- 2

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	59
2	1/9	31
3	1/27	14
4	1/81	4

UHT (long life) MILK- 1

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	0
2	1/9	1
3	1/27	0
4	1/81	0

UHT (long life) MILK- 2

Dilution No.	Dilution	Bacteria counts (CFU- colony forming unit)
1	1/3	1
2	1/9	0
3	1/27	1
4	1/81	0

ok so that's all. in the end i stuck with 3 types of milk :) oh yeah- btw, the UHT milk, by itself (no dilution) also had no bacteria but i didn't put that on the results table :P anyway, i'll blog again to talk about some of the results, variation etc.

gooooood nighty