Effects of pH on distribution of Listeria ribotypes in corn, hay, and Grass silage

Article Abstract:

Microbiological research shows that corn silage which has a pH of less than 4.0 may not be safe because it could contain Listeria spp., including pathogenic Listeria monocytogenes strains. Listeria spp. isolates from corn, hay and grass silage have been assessed using automated ribotype analysis. It is easy to detect unsafe silage samples with a pH of over 4.0 because they are obvious to the observer.

Listeria monocytogenes, Listeria

Byssochlamys nivea as a source of mycophenolic acid

Article Abstract:

Secondary metabolite production by Byssochlamys nivea was analyzed and mycophenolic acid and its precursors, 5-methylorsellinic acid and 5,7-dihydroxy-4-methylphthalide, were identified in all of the B. nivea strains. Byssochlamys species are responsible for spoilage and degradation of fruits and silages and can also produce the mycotoxin patulin.

Science & research, Bacterial genetics

Mycophenolic acid in silage

Article Abstract:

Scientists found mycophenolic acid in 32% of 233 silage samples tested. Levels ranged from 20 to 35,000 micrograms per kilogram. Because this fungal compound is immunosuppressive, it can make livestock more susceptible to infection.