Acid-activated Nibo clay was applied as an adsorbent in the bleaching of crude palm oil. The collected sample activated with hydrochloric acid solution after it sun-dried and ground. raw (NC) (ANC) samples were characterized using XRF, SEM, FTIR analyses. efficiency process examined by varying dosage, temperature contact time. results analyses on NC ANC showed that clays kaolinites significant ...

This article reviews the literature on the use of hydrogen peroxide in three professionally administered bleaching techniques from historical, technique, and safety viewpoints. Safety over time, absolute safety, and relative safety of nonvital bleaching, in-office vital bleaching, nightguard vital bleaching, and over-the-counter bleaching kits are compared. The advantages and disadvantages of d...

Until recently, subtropical Hawai'i escaped the major bleaching events that have devastated many tropical regions, but the continued increases in global long-term mean temperatures and the apparent ending of the Pacific Decadal Oscillation (PDO) cool phase have increased the risk of bleaching events. Climate models and observations predict that bleaching in Hawai'i will occur with increasing fr...

BACKGROUND Tooth bleaching is a safe and conservative treatment modality to improve the esthetic appearance of discolored teeth. One of the problems with the use of bleaching agents is their possible effect on surface microhardness of resin-based materials. The present study was carried out to evaluate the effect of in-office and at-home bleaching on surface microhardness of giomer. MATERIAL ...

Limited information is available on the bleaching susceptibility of coral species that dominate high latitude reefs along the eastern seaboard of Australia. The main aims of this study were to: (i) monitor coral health and spatial patterns of coral bleaching response at the Solitary Islands Marine Park (SIMP) and Lord Howe Island Marine Park (LHIMP), to determine variability of bleaching suscep...

The vast increase in CO2 and waste generation recent decades has been a major obstacle to sustainable development sustainability. In construction industry, the production of ordinary Portland cement is greenhouse gas emitter with almost 8% total world. To address this, Alkali-activated materials geopolymer have more recently introduced as green alternative significantly lowered environmental fo...