These bacteria produce a red color when grown
at temperatures below 35-37C, but do not produce
this pigment at higher temperatures, resulting in
a pale off-white color. Also, the bacteria produce
more red color when they're grown at higher
densities [more crowded], and they produce less
pigment in nutrient-poor media, whether the
bacteria are crowded or not.
So hot or starved bacteria would be pale, and
red-colored bacteria would be found at cooler
temperatures [35-37 degrees centigrade] and when
they're well fed. The part about crowding is
confusing, because they're red if they're
crowded and well-fed, but they're pale if they
don't have enough food, even if they're crowded.
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