What does it mean that acid is produced from ____ by bacteria?

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The discussion centers on the metabolic capabilities of Streptococcus thermophilus, specifically its ability to produce acid from glucose but not from glycerol. This indicates that while S. thermophilus can utilize glucose for energy and produce acidic byproducts, it does not have the metabolic pathways necessary to convert glycerol into acid. This distinction is important for understanding the bacterium's metabolic preferences and capabilities, but it does not imply that S. thermophilus cannot survive on glycerol; rather, it highlights the specific substrates that lead to acid production. Additionally, there is a request for resources that provide information on the chemical pathways associated with specific bacterial species, such as gluconeogenesis and glycolysis, reflecting a need for more detailed metabolic insights in microbiology.
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What does it mean that "acid is produced from ____" by bacteria?

I've identified a bacteria (specifically stephococcus thermophilis) and am using Bergey’s Manual® of Systematic Bacteriology to learn more about it. The manual states S. Thermophilis produces acid from glucose, but not from glycerol and I'm wondering exactly what this means?

Does it mean that s. thermophilis can survive on glucose but not on glycerol? Or is it mearly a test to differentiate between bacteria and does not have anything to do with what the bacteria survive on?

On another note is there a website or book out there that if I know what bacterial species I'm working with, it will tell me what chemical pathways are present (ie gluconeogenesis, glycolysis).

I'm trained as a chemist so please forgive me if my question is trivial.
 
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That distinction doesn't mean that it can't survive on glycerol. It means that the pathways present create acidic byproducts from glucose but not glycerol.
 

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