What is the fine-grained topic of the following text: The results of this study revealed that the marine actinomycetes isolated from the sediments of Caspian Sea produce biomolecules effective against MDR bacteria, and suggested that these strains deserve to be studied as potential probiotics due to their anti-vibrio activity besides exoenzyme production. Only return the topic.
Marine actinomycetes in Caspian Sea sediments producing biomolecules effective against MDR bacteria and their potential as probiotics.