25460
The influence of fermentation temperature , agitation rate , and additions of carbon sources , nitrogen sources , vitamins and minerals on production of kefiran by kefir grains lactic acid bacteria was studied in a series of experiments .
 carbon, nitrogen, lactic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 carbon, nitrogen, lactic acid