Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments.

An aqueous suspension of nanogibbsite was synthesized via the titration of aluminum aqua acid [Al(H2O)6] with L-arginine to pH 4.6. Since the hydrolysis of aqueous aluminum salts is known to produce a wide array of products with a wide range of size distributions, a variety of state-of-the-art instruments (i.

Solid-State Al NMR Spectroscopy of the γ-Al Keggin Containing Al Coordinated by a Terminal Hydroxyl Ligand.

We report solid-state Al NMR spectroscopic results for the sulfate salt of the γ-Al Keggin cluster, γ-[AlOAl(OH)(OH)][SO]·[HO], that provide a spectroscopic signature for partial hydrolysis of this Keggin-type cluster. In Al multiple-quantum magic-angle spinning NMR spectra, all 13 Al positions of the cluster are at least partially resolved and assigned with the aid of density functional theory (DFT) calculations of the Al electric field gradients. The isotropic chemical shift of the single tetrahedral site, 75.

Multiparameter assessments to determine the effects of sugars and antimicrobials on a polymicrobial oral biofilm.

Clinical studies indicate relationships between dental plaque, a naturally formed biofilm, and oral diseases. The crucial role of nonmicrobial biofilm constituents in maintaining biofilm structure and biofilm-specific attributes, such as resistance to shear and viscoelasticity, is increasingly recognized. Concurrent analyses of the diverse nonmicrobial biofilm components for multiparameter assessments formed the focus of this investigation.

The technology behind Colgate Simply White Toothpaste.

Colgate Simply White Toothpaste is a new advanced tooth whitening dentifrice that can be used every day. The synergy of abrasive stain removal with activated hydrogen peroxide delivers excellent performance in the removal of extrinsic and intrinsic tooth stain. Colgate Simply White Toothpaste provides other oral health benefits that have become the cost-of-entry into the toothpaste market: caries protection, tartar control, fresh breath, and a preferred flavor.

Breath-odor evaluation by detection of volatile sulfur compounds--correlation with organoleptic odor ratings.

Volatile sulfur compounds are known to be major contributors to oral malodor, and their detection by gas chromatography (GC) is a commonly used method for evaluating breath odor in clinical trials. A custom-designed breath-sampling GC system was developed for this purpose. A clinical study was performed to compare the performance of this instrumental method to organoleptic evaluation by trained odor judges.