Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Micro-XRF mapping of Zn (red), K (blue), and Ca (green) in the cross-sections of young, mature, and old leaf blades collected from healthy (a) and HLB-affected (b) grapefruit plants. Fluorescence intensities of elements were normalized and subsequently translated to concentrations by using measurements of the standards. Pixel brightness is displayed in RGB, with the brightest spots corresponding to the highest concentrations (µg cm–2) for the element depicted. Scale bar: 200 µm.
