The spontaneous formation of complex polymers from amino acids and purines is not at all a straightforward process.

They can also provide the spontaneous formation of gradients.

In the context of corrosion, 'passivation' is the spontaneous formation of a hard non-reactive surface film that inhibits further corrosion.

The spontaneous formation of complex polymers from abiotically generated monomers under the conditions posited by the "soup" theory is not at all a straightforward process.

The spontaneous formation of interesting spatial features on a wide range of length scales is one manifestation of plasma complexity.

If extremely directed efforts by conventional organic chemistry cannot yet make this molecule, its spontaneous formation out of chaos stretches credulity.

Anethole is responsible for the "ouzo effect", the spontaneous formation of a microemulsion that gives many alcoholic beverages containing anethole and water their cloudy appearance.

In recent years, interest in the sport at the grassroots level has skyrocketed, leading to the spontaneous formation of local clubs, loosely affiliated with provincial/state and national associations.

Hagerup, O. (1947) The spontaneous formation of haploid, polyploid, and aneuploid embryos in some orchids.

Adding to the confusion, some scientists doubt that the Earth's early atmosphere had the proper composition to promote the spontaneous formation of either kind of molecule.