( It ( ( ( is also ) ( necessary ( to ( ( use ( fused ( quartz cuvettes ) ) ) ( because ( glass ( is ( opaque ( to ultraviolet ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADVP (RB also)) (ADJP (JJ necessary) (S (VP (TO to) (VP (VB use) (NP (JJ fused) (NN quartz) (NNS cuvettes)) (SBAR (IN because) (S (NP (NN glass)) (VP (VBZ is) (ADJP (JJ opaque) (PP (TO to) (NP (NN ultraviolet)))))))))))) (. .)))
It is also necessary to use fused quartz cuvettes because glass is opaque to ultraviolet.
(ROOT (S (NP (DT The) (NN mineral) (NN quartz)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB produce) (NP (NN glass))))))) (. .)))