Inspired by Jaby's work on large scale microbe distribution, I've been testing the changes in microbe distribution on small scales. These tests demonstrate that the microbe population shifts as your kettle crosses coordinate lines. The degree of shift is dependent on the degree to which the coordinate is divisible by two.
Yeast Tests were done with a pair of kettles on odd numbered coordinates, thus testing the change across the even numbered coordinates. Earlier work had shown that a sharp change in population could occurs across a very small space within a coordinate boundary (see here). Following a suggestion by Jaby, I demonstrated that the change accross at 32 coordinate boundary was larger then the change within it. (see here). In these tests, I show that the degree of population shuffling increases the more the coordinate is divisible by two.
A couple of take aways for brewers from this
Here is an example test at a 128 coordinate corner boundary, in this case 2048e, 3200n. Four kettles were placed at the odd numbered coordinates one away from the boundary square. As you can see, all four kettles show a good shuffling of the microbes. Useful if you are trying to find a particular yeast in your neighbourhood.
| -1e, +1n | A22 Y82 Y73 L37 Y91 Y41 | -1e, +1n | M23 Y43 Y50 L92 A30 M71 |
| -1e, -1n | L92 Y58 L100 Y73 Y24 Y80 | -1e, -1n | Y50 L69 L21 A78 L28 Y34 |
Introduction
Yeast Tests were done with a pair of kettles on odd numbered coordinates, thus testing the change across the even numbered coordinates. I recorded the top six microbes. I had developed in earlier tests a numeric score for the rate of microbe change between samples. This score is called Total Shift. Total Shift is calculated as follows. Comparing sample 1 to sample 2, if a microbe is in the same place in the list, its shift is zero. If the microbe has moved one space either left or right, its shift is 1, if it has moved 2 spaces, its shift is 2 etc. Microbes that dissapear from the sample are assumed to have moved to position 7, and new entries are calculated as having come from that position. The third column in the following tables is the Total Shift from one sample to the next. This calculation gives a bit of numeric gloss to the observations. A bit better than saying it "changes a bit" or it "changes a lot". What I think is really changing though is the Microbe Entry times, and microbe entry order is only a rough guide to those. Since nicrobe entry order is all we can directly measure though, I have stuck to basing my calculations on that.
Microbe Variation across coordinate line n
n = 3584 (512)
| +1 n | L52 Y17 Y32 L21 Y35 Y16 | - |
| -1 n | Y42 L85 Y19 L92 Y11 M47 | 20 |
n = 3328 (256)
| +1 n | Y82 Y64 L36 Y83 A38 M63 | - |
| -1 n | M95 M79 M87 Y96 A22 A94 | 20 |
n = 3456 (128)
| +1 n | L45 Y35 Y16 Y19 L28 Y99 | - |
| -1 n | L52 Y83 Y48 A38 A6 L93 | 20 |
n = 3392 (64)
| +1 n | Y83 L36 L52 A38 L92 Y43 | - |
| -1 n | Y83 A38 L36 Y64 L92 A22 | 8 |
n = 3360 (32)
| +1 n | Y83 A38 Y64 L36 L52 Y82 | - |
| -1 n | Y83 L36 Y64 L52 A38 Y43 | 7 |
n = 3344 (16)
| +1 n | Y83 Y64 L36 Y82 Y52 A38 | - |
| -1 n | Y64 L36 Y82 Y83 A38 L52 | 8 |
n = 3352 (8)
| +1 n | Y83 L36 Y64 L52 A38 Y82 | - |
| -1 n | Y83 L36 Y64 L52 A38 Y82 | 0 |
n = 3348 (4)
| +1 n | Y83 L36 Y64 L52 Y82 A38 | - |
| -1 n | L36 Y83 Y64 L52 Y82 A38 | 2 |
n = 3346 (2)
| +1 n | L36 Y83 Y64 L52 Y82 A38 | - |
| -1 n | Y83 Y64 L36 Y82 Y52 A38 | 6 |