Several properties of agar render it a superior jelly. Agar isn’t broken down by microbial enzymes apart from a few species (including bacteria living in marine and freshwater habitats), and it dissolves well in boiling water, making it easy to sterilize. The jelly doesn’t react with the ingredients of a broth, whose composition can be adjusted to meet the nutritional requirements of different microbes, and sets to a firm gel without the need for refrigeration.
1A full list of these materials can be found at (psfa0134, pg. 9).
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WTI原油涨4%，报67.8美元/桶；布伦特原油涨3.69%，报73.451美元/桶。