18697
These widely tunable microfluidic oscillators are envisioned to be broadly useful for the study of biological rhythms , as on - chip timing sources for microfluidic logic circuits , and other applications that require variation in timed flow switching .
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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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