Gene Expression in Autumn Leaves

Simulation of Autumn Leaves

The deformation of a leaf is the aggregation of the deformation of all the cells on the leaf. Mesophyll cells and vascular bundle cells have distinctly different degree of rigidity for shrinkage. In order to simulate the deformation of an autumn leaf realistically we need the realistic venation distribution of the leaf. We modify Runions’s technique [Runions et al. 2005] by increasing the growi...

Why red-dominated autumn leaves in America and yellow-dominated autumn leaves in Northern Europe?

Autumn leaves: about aging and allergy

When the autumn leaves start to fall, it is ideal time to think about aging, and perhaps allergy for us. This issue of Asia Pacific Allergy features important issue on respiratory allergy in the elderly from the Korean Longitudinal Study on Health and Aging cohort [1]. Population aging is an emerging issue in every part of the world, especially in Asia. As autumn leaves turn into red and gold, ...

Autumn leaves seen through herbivore eyes.

Why leaves of some trees turn red in autumn has puzzled biologists for decades, as just before leaf fall the pigments causing red coloration are newly synthesized. One idea to explain this apparently untimely investment is that red colour signals the tree's quality to herbivorous insects, particularly aphids. However, it is unclear whether red leaves are indeed less attractive to aphids than gr...

Ice Nucleating Particle Concentrations Increase When Leaves Fall in Autumn

Ice nucleating particles active at −8 ◦C or warmer (INP−8) are produced by plants and by microorganisms living from and on them. Laboratory studies have shown that large numbers of INP−8 are produced by decaying leaves. At three widely dispersed locations in Northwestern Eurasia, we saw, from an analysis of PM10 filter samples, that seasonal median concentrations of INP−8 in the boundary layer ...