Colorimetric Detection of Ascorbic Acid Based on the Trigger of Gold Nanoparticles Aggregation by Cr(III) Reduced from Cr(VI).

Au nanoparticles (AuNPs) dispersed in water were stabilized by tripolyphosphate (PO). When CrO (Cr(VI)) was present, the AuNPs did not change; when Cr (Cr(III)) was present, the AuNPs would aggregate because of cooperative metal-ligand reaction. Aggregated AuNPs showed different color from the non-aggregated ones.

Renal myolipoosteoma: A distinctive lesion in a child.

We describe a distinctive renal tumor, a myolipoosteoma (MLO), in an 11-year-old boy who presented with a 6-month history of slight right flank intermittent pain. A gross examination revealed a well-defined, 5.5 cm mass with bone-like consistency.