1793
Recent research has shown that high frequency ultrasound ( 0 . 4 - 3 MHz ) , can enhance milkfat separation in small scale systems able to treat only a few milliliters of sample .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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