a filter to prevent particles from passing through to the growth medium , and also in vessels without a filter, but with air allowed in via a curved tube so dust particles would settle and not come in contact with the broth. by boiling the broth beforehand, pasteur ensured that no microorganisms survived...
has a breathing siphon , although much shorter than in the pomacea species. pomacea canaliculata , in the back pomacea diffusa . pomacea canaliculata , yellow variant. marisa cornuarietis ....
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