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According to IUPAC Glossary of Terms Used in Toxicology [1, ppp. 1211, 1245] these and similar notations are just ordinary upright characters with corresponding indices:

inhibitoryeffective concentration (ICEC)
Concentration of a substance that causes a defined inhibitionmagnitude of response in a given system. Note: IC50EC50 is the median concentration that causes 50 % inhibitionof maximal response.

[...]

inhibitory doseconcentration (IDIC)
DoseConcentration of a substance that causes a defined inhibition of a given system. NoteNote: IDIC50 is the median doseconcentration that causes 50 % inhibition.

Reference

  1. Duffus, J. H.; Nordberg, M.; Templeton, D. M. Pure and Applied Chemistry 2007, 79 (7). DOI: 10.1351/pac200779071153.

According to IUPAC Glossary of Terms Used in Toxicology [1, p. 1245] these and similar notations are just ordinary upright characters with corresponding indices:

inhibitory concentration (IC)
Concentration of a substance that causes a defined inhibition of a given system. Note: IC50 is the median concentration that causes 50 % inhibition.

inhibitory dose (ID)
Dose of a substance that causes a defined inhibition of a given system. Note: ID50 is the median dose that causes 50 % inhibition.

Reference

  1. Duffus, J. H.; Nordberg, M.; Templeton, D. M. Pure and Applied Chemistry 2007, 79 (7). DOI: 10.1351/pac200779071153.

According to IUPAC Glossary of Terms Used in Toxicology [1, pp. 1211, 1245] these and similar notations are just ordinary upright characters with corresponding indices:

effective concentration (EC)
Concentration of a substance that causes a defined magnitude of response in a given system. Note: EC50 is the median concentration that causes 50 % of maximal response.

[...]

inhibitory concentration (IC)
Concentration of a substance that causes a defined inhibition of a given system. Note: IC50 is the median concentration that causes 50 % inhibition.

Reference

  1. Duffus, J. H.; Nordberg, M.; Templeton, D. M. Pure and Applied Chemistry 2007, 79 (7). DOI: 10.1351/pac200779071153.
1
source | link

According to IUPAC Glossary of Terms Used in Toxicology [1, p. 1245] these and similar notations are just ordinary upright characters with corresponding indices:

inhibitory concentration (IC)
Concentration of a substance that causes a defined inhibition of a given system. Note: IC50 is the median concentration that causes 50 % inhibition.

inhibitory dose (ID)
Dose of a substance that causes a defined inhibition of a given system. Note: ID50 is the median dose that causes 50 % inhibition.

Reference

  1. Duffus, J. H.; Nordberg, M.; Templeton, D. M. Pure and Applied Chemistry 2007, 79 (7). DOI: 10.1351/pac200779071153.