Leaf Growth & Tree Height Limited By Physics

The leaves of angiosperm trees vary wildly in size, but the range of size narrows among taller trees. Credit: K. Jensen/Harvard University and M. Zwieniecki/UC Davis

New research indicates that leaf growth may not be as complicated as it seems. When compared species to species, shorter trees exhibit a greater variety of leaf sizes than taller ones, with the tallest trees all having leaves that measure 10 to 20 centimeters in length.

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Filamentous Bacteria Act as Living Power Cables


The filamentous bacteria Desulfobulbus can function as living power cables in order to transmit electrons thousands of cell lengths away. The bacteria, which are only a few thousandths of a millimeter in length and are invisible to the naked eye, can form a multicellular filament that can transmit electrons across a distance as large as 1 cm under the right conditions.

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Microglia Are Crucial to Pruning Neurons During Early Development


Microglia are brain cells, who’s spider-like resting state was somewhat mysterious until Axel Nimmerjahn, biophysicist at the Salk Institute in La Jolla, California, began to try and figure out what exactly they did. Microglia are part of the immune system and are particularly sensitive.

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