X-Message-Number: 25214
Date: Sat, 4 Dec 2004 12:26:56 -0800 (PST)
From: Doug Skrecky <>
Subject: 160'th update on fly longevity experiments

     This is the 160'th update of my fly longevity experiments. Average
 temperature was 25.5 C during this run. Estimated maximal longevity using
 the formula (363 - T*11.2) is 78 days.
     Here I examine the effect of varying levels of moisture, and citric
 acid. This run further confirms the current harmfulness of citric acid
 to flies with a low pathogen load. Reducing moisture level also appears
 to be harmful.
     It is interesting that both dehydration and acidification can both
 reduce bacterial growth, yet both of these alterations hurt, rather than
 help flies.

 Run #160                          Percent Survival on Day
 supplement                   16 21 26 31 36 41 46 51 66 73 83
 _____________________________________________________________
 no citric +2 tsp water       96 93 93 75 64 61 50 39  0  -  -
    "      +1 tsp water       91 91 91 83 70 65 61 44 13  9  0
    "      (usual water)      94 94 88 88 77 77 71 65 12  0  -
    "      -1 tsp water       79 75 75 71 63 63 63 58  8  0  -
    "      -2 tsp water       89 74 59 56 52 37 22 22  7  0  -
 citric 1/8 tsp +2 tsp water  81 76 71 67 48 48 48 38 14  5  0
    "           +1 tsp water  52 44 44 41 33 26 26 19  0  -  -
    "          (usual water)  60 60 55 55 55 45 35 30 10  5  0
    "           -1 tsp water  56 44 33 33 33 22 22 22  6  0  -
    "           -2 tsp water  71 57 57 52 48 29 19 24 14  5  0
 citric 1/2 tsp +2 tsp water  41 33 30 26 19 15 15  7  4  4  0
    "           +1 tsp water  87 57 44 39 35 26 26 17  4  0  -
    "          (usual water)  80 50 40 25 20 15 10  5  0  -  -
    "           -1 tsp water  65 48 43 43 38 38 33 30  3  0  -
    "           -2 tsp water  35 24 15 12  9  9  3  0  -  -  -

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