Geochemists report that photosynthesis leaves behind a unique calling card in the form of a chemical signature that is spelled out with stable oxygen isotopes. The findings suggest that similar isotopic signatures could exist for many biological processes, including some that are difficult to observe with current tools.
Scientists have shown that the ability of tissues to orient their growth in response to externally applied forces is a simple consequence of the mechanics of cellularised materials and the ability of individual cells to divide along their long axis.
Biological and medical scientists have been using flow cytometry to count cancer cells for the past 40 years. But the large instruments are expensive and can only be operated by trained personnel. By contrast the PoCyton cytometer is cheap to produce, no bigger than a shoebox, and automated.