"However, the tungsten diselenide crystals can align in on the sapphire substrate.

Source: https://phys.org/news/2023-08-mirror-twins-defect-plaguing-generation.html

So there’s not much more color to add about the substrate and EPI suppliers at this point.

Source: https://seekingalpha.com/article/4581538-navitas-semiconductor-corporation-nvts-q4-2022-earnings-call-transcript?source=feed_all_articles

The quality and safety of fermented foods lies in the quality of the "substrate" it's made from, such as legumes.

Source: https://allafrica.com/stories/202307140006.html

The shelves are lined with plastic containers full of substrate, which is where the mushrooms grow in.

Source: https://www.cbc.ca/news/canada/prince-edward-island/pei-gourmet-mushrooms-summerside-1.6846179?cmp=rss

The staff is still evaluating any impact the dredging had on the marsh grass or substrate, DHEC Media Relations Director Ron Aiken told The Post and Courier.

Source: https://www.postandcourier.com/hilton-head/hilton-heads-preserved-natural-beauty-is-part-of-its-brand-can-the-island-keep-it/article_8f97f756-d4b2-11ed-8d4d-3b5ed37d79cc.html