The definite article 'The' is necessary for the following bold lines? [closed]
Maehara et al, 2011 conducted a research on isolated endophytic fungi/sp from the quinine bark.
What is the specific reason if I have to omit 'the' in this context?
"The" refers to a specific instance or sample of quinine bark. If you were in the lab and saw a pile of quinine bark you might say to a colleague "I'm going to run a test on the quinine bark," but to the rest of the world there is just quinine bark in general, which is (presumably) what the research hinges on.