Table 5. Results of experiments on the efficacy of HAP and titanium sponge as possible nucleants.

Protein	Hy­droxy­apatite	Titanium sponge
α-Crustacyanin	Crystals after 24 h, controls clear after 4 weeks	Crystals after 24 h
Trypsin	No crystals, controls clear after 4 weeks	Crystals after 15 d
Thaumatin	Crystals after 24 h, crystals after 5 d in controls	No crystals
Haemoglobin	Crystals after 24 h, controls clear after 4 weeks	No crystals
α-Lactalbumin	Crystals after 72 h, controls clear after 4 weeks	No crystals
Glulisine	Crystals after 48 h, controls clear after 4 weeks	No crystals
Lysozyme	No crystals, crystals after 48 h in controls	No crystals