Multi-residue analysis of certain lanolin nipple care products for trace contaminants.

Background: Topical lanolin is commonly used on nipples to aid breastfeeding success. The raw material undergoes refinement to remove contaminants such as pesticides, which may accumulate from exogenous environmental sources. The level of refinement influences final lanolin purity.

Polarization-dependent non-uniform rotation rates of rhombohedral calcite.

We demonstrate the polarization-dependent torque on rhombohedral calcite in an optical trap. Our precipitate technique produces regular crystals approximately 10μm on all edges. The regularity of the crystal shape makes it possible to visually identify the optical axis as well as the orientation of the polarization axes.