X-Message-Number: 24664
Date: Sun, 19 Sep 2004 12:45:42 -0700 (PDT)
From: Doug Skrecky <>
Subject: 152'nd update on fly longevity experiments
This is the 152'nd update of my fly longevity experiments. Average
temperature was 26.8 C during this run. Estimated maximal longevity (EML)
using the formula (363 - T*11.2) is 63 days.
Here I have a ube showdown. Back in run #138, raw purple sweet potato
(ube) appeared to be beneficial. However ube was a dud in run #148 in
powder form, and in run #149 in frozen form. The processing of later two
forms would have involved cooking, which might be the critical
difference. Here I check ube that is raw, as well as boiled whole. I also
test the effect of cutting the ube into small pieces, so that boiling can
then leach much of the purple color. Finally a hot water extract of ube
is also tested.
By a fluke of luck the control one bottle's maximum
survival exeeded EML by 17%. As expected, boiling the ube rendered
it mildly toxic. Whatever was responsible for this toxicity, it was
poorly water soluble, since most of the hot water extracts slightly
increased survival at 52 days. In published experiments the heating of
fats has increased their toxicity to flies. This might account for the
current results.
Raw ube proved to beneficial again. My primary suspects for ube's
main prolongevity ingrediants are elements of the anthocyanidin-based
purple coloring.
Run #152 Percent Survival on Day
supplement 11 20 26 32 37 42 47 52 58 63 68 74 79
________________________________________________________
control one 93 90 90 79 68 57 39 18 14 11 7 4 0
control two 97 89 89 83 69 49 34 20 14 0 - - -
ube, leached 20% 100 51 51 31 26 3 0 - - - - - -
ube, leached 20% 97 79 73 52 36 15 3 0 - - - - -
ube, boiled 20% 92 77 59 28 8 0 - - - - - - -
ube, boiled 20% 100 93 89 63 44 33 7 4 0 - - - -
ube, extract 20% 97 93 93 93 90 73 53 27 7 3 0 - -
ube, extract 20% 92 89 89 85 81 62 42 15 0 - - - -
ube, extract 50% 100 96 92 84 64 60 40 24 8 0 - - -
ube, extract 50% 100 91 91 83 74 57 39 26 9 4 0 - -
ube, raw 20% 100 81 81 81 69 63 44 38 13 0 - - -
ube, raw 20% 97 93 93 93 79 61 54 50 18 4 0 - -
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