A process for the asymmetric aziridination of an alkene comprising treating the alkene with a sulfonyl azide, preferably trichloroethoxysulfonyl azide, in the presence of a cobalt(II) porphyrin.

For enumeration: spread plate method using bile esculin azide agar (EN 15788

Analytical method [1]Enumeration: spread plate method using bile esculin azide agar.

Preferred control plasmas also contain thimerosal and/or sodium azide.

Analytical method [1]Enumeration: spread plate method using bile esculin azide agar (EN 15788

Analytical method [1]Enumeration: spread plate method using Bile Esculin Azide agar (EN 15788).

Enterococcus faecium DSM 7134: spread plate method using bile esculin azide agar (EN 15788

Internal standard: xylitol (aqueous solution of about 10 g/l to which a spatula tip of sodium azide is added

In other embodiments are provided methods for enzymatically labeling nucleic acids with an azide group.

Analytical method [1]Enumeration: spread plate method using bile esculin azide agar (EN 15788

The provided compounds are useful for diagnosis and imaging of azide-containing molecules.

The method involves the formation of a phosphinothioester which reacts with an azide resulting in amide formation.

For enumeration: spread plate method using bile esculin azide agar (EN 15788

The amount of poly(sulfonyl azide) is preferably from 0.01 to 5 weight percent of polymers in the admixture.

Analytical method [1]Enumeration spread plate method using bile esculin azide agar.