As nouns the difference between fraction and subfraction

is that fraction is a part of a whole, especially a comparatively small part while subfraction is the result of fractionating a fraction into smaller components.

As a verb fraction

is to divide or break into fractions.

As nouns the difference between component and subfraction

is that component is component while subfraction is the result of fractionating a fraction into smaller components.

As adjectives the difference between smaller and subnanomolar

is that smaller is comparative of small while subnanomolar is smaller than nanomolar.

As adjectives the difference between nanomolar and subnanomolar

is that nanomolar is describing concentrations one billionth (10^-9) of molar while subnanomolar is smaller than nanomolar.

Striga is likely misspelled.

Striga has no English definition.

As a noun witchweed is

any of several flowering plants of the genus Striga, from Africa and Asia, some of which are parasitic to crops.

As nouns the difference between parasitic and witchweed

is that parasitic is (computing) component of a circuit that does not show up in a circuit's schematic but does show up in the circuit's behavior while witchweed is (biology) any of several flowering plants of the genus striga , from africa and asia, some of which are parasitic to crops.

As an adjective parasitic

is pertaining to a biological or symbolic parasite.

As a verb enzyme

is .

As a noun convertase is

(enzyme) any of several enzymes that convert a compound into smaller, biologically-active compounds.

As nouns the difference between convert and convertase

is that convert is a person who has converted to his or her religion while convertase is (enzyme) any of several enzymes that convert a compound into smaller, biologically-active compounds.

As a verb convert

is (lb) to transform or change (something) into another form, substance, state, or product.

As a noun nodule

is a rounded mass or irregular shape; a little knot or lump.

As a proper noun rhizobium is

.

As proper nouns the difference between root and rhizobium

is that root is while rhizobium is .