As a noun picosecond

is .

As an adjective subpicosecond is

describing durations shorter than a picosecond.

As a verb promote

is to raise (someone) to a more important, responsible, or remunerative job or rank.

As a noun brassinolide is

(biochemistry) a brassinosteroid that promotes cell elongation and division.

As nouns the difference between natural and betulin

is that natural is while betulin is (biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As an adjective natural

is that exists and evolved within the confines of an ecosystem.

As an adjective abundant

is fully sufficient; found in copious supply; in great quantity; overflowing .

As a noun betulin is

(biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As nouns the difference between isolate and betulin

is that isolate is something that has been isolated while betulin is (biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As a verb isolate

is (label) to set apart or cut off from others.

As nouns the difference between bark and betulin

is that bark is (three-masted vessel) while betulin is (biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As nouns the difference between birch and betulin

is that birch is any of various trees of the genus betula , native to countries in the northern hemisphere while betulin is (biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As a verb birch

is to punish with a stick, bundle of twigs, or rod made of birch wood.

As nouns the difference between convert and betulin

is that convert is a person who has converted to his or her religion while betulin is (biochemistry) a naturally abundant triterpene, commonly isolated from the bark of birch trees, that can be converted to betulinic acid.

As a verb convert

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

As nouns the difference between permafrost and subpermafrost

is that permafrost is permanently frozen ground, or a specific layer thereof while subpermafrost is the non-frozen ground below the permafrost.

As nouns the difference between bicyclic and borneol

is that bicyclic is (chemistry) a bicyclic compound while borneol is borneol.

As an adjective bicyclic

is having two cycles.