Vitamin D is a fat soluble vitamin with a well-known general metabolism and actions in bone structure and immune system regulation. Vitamin D exhibits direct antimicrobial activities against a spectrum of microbes, including Gram-positive and Gram-negative bacteria, enveloped and non-enveloped viruses, as well as fungi. An observational study showed that concentrations of 38 ng/ml or more were ...

This is an attempt to define a notion of Betti structure with nice functorial property for algebraic holonomic D-modules which are not necessarily regular singular.