X-Message-Number: 25461
Date: Sat, 1 Jan 2005 11:00:03 -0800 (PST)
From: Doug Skrecky <>
Subject: 162'nd update on fly longevity experiments

    This is the 162'nd update of my fly longevity experiments. Average
temperature was 22.6 C during this run. Estimated maximal longevity
using the formula (363 - T*11.2) is 110 days.
    Here I take a look at very small amounts of citric acid, and check
out the addition of yeast. Yeast was not expected to be beneficial,
since it would increase the levels of carbon dioxide in my sealed
bottles. For this reason yeast has never been incorporated in my own
longevity experiments. Published longevity experiments examining yeast
addition have yielded conflicting results, which were possibly due to
differences in the sealers used.
    As expected, yeast reduced survival. Small additions of citric acid
yielded no consistent effects.

Run #162                   Percent Survival on Day
supplement         10  15  20 25 40 47 57 65 76 84 94 104 114
_____________________________________________________________
control one        86  71  71 71 48 33 29 24 14  5  5   0   -
control two       100  92  86 81 56 39 25 22  8  6  3   3   0
citric 1/32 tsp    85  85  80 75 60 45 25 10  0  -  -   -   -
citric 1/32 tsp   100 100 100 94 56 56 50 39 22 22 11   6   0
yeast 1/16 tsp     95  90  70 70 25 25 20 15  5  5  0   -   -
yeast 1/16 tsp     95  86  81 48 19 19 14 14 10  0  -   -   -
+ citric 1/16 tsp  84  79  68 53 21 16 16  5  0  -  -   -   -
+ citric 1/16 tsp  92  85  85 85 31 23  8  8  0  -  -   -   -
yeast 1/8 tsp     100 100  80 70 30 20 20 10 10  0  -   -   -
yeast 1/8 tsp      92  75  58 42 17  0  -  -  -  -  -   -   -
yeast 1/4 tsp      92  92  85 54 54 23 23  0  -  -  -   -   -
yeast 1/4 tsp      92  85  77 62  8  8  8  8  8  8  0   -   -
yeast 1/2 tsp      83  42  33 25 17  8  0  -  -  -  -   -   -
yeast 1/2 tsp      94  77  65 41  0  -  -  -  -  -  -   -   -

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