pumice

pumice stone substance of volcanic origin consisting chieffly of complex silicates of aluminium and alkali metals PubMed: Changes in growth, essential oil yield and composition of geranium (Pelargonium graveolens L.) as affected by growing media. PubMed: Low-quality vegetable oils as feedstock for biodiesel production using K-pumice as solid catalyst. Tolerance of water and free fatty acids contents. PubMed: Effect of bleaching on tooth discolouration from food colourant in vitro. PubMed: Influence of calcium and silicon supplementation into Pleurotus ostreatus substrates on quality of fresh and canned mushrooms. PubMed: Effect of pH on tooth discoloration from food colorant in vitro. PubMed: Use of immobilised bacteria for the wastewater treatment--examples from the sugar industry. PubMed: Anaerobic upflow fixed-film bioreactor for biomethanation of salty cheese whey. PubMed: The regulation of crystalline silica: an industry perspective. PubMed: Effects of dietary oil contamination and absence of prophylaxis on orthodontic bonding. PubMed: Feeding rate of larval Aedes vexans stimulated by food substances.