Relative chemical levels

[cerivs]

ZDB-PUB-160617-4 has High levels of calcium, low levels of calcium, Low Na+ & low Cl-, High Na+& low Cl- and High Na+& High Cl-
Can't represent relative chemical concentrations and their effects on gene expression which is one of the main points of the paper.

[cerivs]

Possible terms TBD
Chemical treatment with low levels of ChEBI:#
Experimental condition in which the fish is treated with relatively low levels a chemical substance. This treatment could be administered by adding the chemical substance to the tank water, injections, or by consumption.
Chemical treatment with high levels of ChEBI:#
Experimental condition in which the fish is treated with relatively high levels a chemical substance. This treatment could be administered by adding the chemical substance to the tank water, injections, or by consumption.

[sabrinatoro]

In the same "spirit", we would also need to be able to curate deficiencies and excess of Chemical for the following:

• food content + high/low Chebi:#
  example: "Zinc deficiency" (ZDB-PUB-170308-1)
• water quality + high/low Chebi:#
  example: water low in zinc (or other element... need to find the PUB id)
  Note: these are different from "chemical treatments"