| http://www.w3.org/ns/prov#value | - When Pasteur demonstrated the fact that sterile organic liquids, when protected by a sterilized cotton air-filter, can be kept indefinitely without undergoing any putrefactive or fermen- tative change, he also proved that such changes are due to the presence of micro-organisms; and, extending his investigations, he found that certain definite kinds of change are due to particu- lar species of low
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