Melanin—and specifically, the form called eumelanin—is the primary pigment that gives humans the coloring of their skin, hair, and eyes. It protects the body from the hazards of ultraviolet and other ...

X-ray absorption (XA) spectroscopy is an essential experimental tool to investigate the local structure of liquid water. Interpretation of the experiment poses a significant challenge and requires a ...

X-ray absorption near-edge structure (XANES) spectra are the fingerprint of the local atomic and electronic structures around the absorbing atom. However, the quantitative analysis of these spectra is ...

About 2.5 billion years ago, a pigment called chlorophyll appeared in single-celled organisms, allowing them to capture energy in the form of light and convert it into sugars. This biochemical trick, ...

PORTLAND, Ore. — Current solar materials must be chosen to match a specific wavelength of sunlight, but a new hybrid inorganic/organic material could usher in solar cells that absorb all solar ...

Your body absorbs heme iron from meat, fish, and poultry more easily than non-heme iron from plant foods. Heme iron is absorbed at rates up to 40%, while non-heme iron is absorbed much less ...

Scientists for the first time have developed a single molecule that can absorb sunlight efficiently and also act as a catalyst to transform solar energy into hydrogen, a clean alternative to fuel for ...