Moreover, elements of such substratum would be incapable of passing from existence only if they were indivisible and thus had no void that is, were solid.
To take one example, Gassendi assumes material objects must have some substratum composed of basic and indivisible elements ('principles'), and proposes that atoms, as the best candidates for the role of substrata, are the material principles in question.
Different mushrooms can respond in different ways for the same chemical elements contained in the substratum where they live and a good example seems to be just a case of As.
In other words, the fundamental substratum of the world could not be an element of the world.
The importance of a mineralogical understanding was highlighted, which determines the availability of elements to saxicolous crustose lichens intimately associated with the substratum through weathering processes which may involve the lichen itself (Purvis, 1985; Purvis and Halls, 1996; Purvis, 2000).
The eighth of the nine Vaiśeṣika types of substance is 'self' (ātman), defined as the substratum of mental states such as believing, knowing, etc. (The ninth is 'mind' (manas), a distinct element in the ontology of the mental).
For some of the elements, natural sources may be significant contributors, being released from the withering of the substratum and the banks.
In the only study on bio-enrichment of mushrooms with Li known, the species P. ostreatus cultivated in the substratum (coffee husk; 94 mg Li kg−1 dm) fortified with LiCl (62.5 to 500 mg kg−1) accumulated this element in fruit bodies and as the authors claim: "Li concentration in mushrooms was directly influenced by increasing LiCl concentration in the substrate (p < 0.05)" (Assunção et al. 2012).
Independent of substratum composition, ancient regoliths formed by subaerial weathering are characterized by accumulation of K and other alkaline elements.
Man-made composites, like reinforced and fiber-reinforced concrete elements, behave similarly to natural composite structures (e.g., brittle rocks lying on a ductile substratum).
