Aluminium arsenide is a semiconductor material with almost the same lattice constant as gallium arsenide and aluminium gallium arsenide and wider band gap than gallium arsenide.
Alas is a shallow depression which occurs primarily in Yakutia, which is formed by subsidence of the Arctic permafrost owing to repeated melting and refreezing.
Aminolevulinic acid synthase is an enzyme that catalyzes the synthesis of δ-aminolevulinic acid the first common precursor in the biosynthesis of all tetrapyrroles such as hemes, cobalamins and chlorophylls.
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