نتایج جستجو برای: leaf venation pattern
تعداد نتایج: 431191 فیلتر نتایج به سال:
During flight, many insect wings undergo dramatic deformations that are controlled largely by the architecture of the wing. The pattern of supporting veins in wings varies widely among insect orders and families, but the functional significance of phylogenetic trends in wing venation remains unknown, and measurements of the mechanical properties of wings are rare. In this study, we address the ...
This paper presents a method for simulating color aging of leaves. Our technique is inspired by natural processes. We consider the flow of fluid in the leaf, and its evaporation through stomata. To model this, we use three maps describing the stomata and venation distributions and the fluid flow, respectively. We conduct a simulation that uses these maps to update the amount of fluid sourced in...
Terroir, the unique interaction between genotype, environment, and culture, is highly refined in domesticated grape (Vitis vinifera). Toward cultivating terroir, the science of ampelography tried to distinguish thousands of grape cultivars without the aid of genetics. This led to sophisticated phenotypic analyses of natural variation in grape leaves, which within a palmate-lobed framework exhib...
Complex distribution networks are pervasive in biology. Examples include nutrient transport in the slime mold Physarum polycephalum as well as mammalian and plant venation. Adaptive rules are believed to guide development of these networks and lead to a reticulate, hierarchically nested topology that is both efficient and resilient against perturbations. However, as of yet no mechanism is known...
MISHRA, D. K. 2005. Germplasm variability in neem (Azadirachta indica). A variant neem (Azadirachta indica) tree, growing in the Arid Forest Research Institute (AFRI), Jodhpur, India was compared with the nearby growing normal tree and a neem tree from Thailand of the same age. The tree has now attained the height of 6 m and collar diameter of 38 cm. The tree differed morphologically, viz. leaf...
As plant tissues dehydrate, water transport efficiency declines, a process typically attributed to air obstruction (embolism) in the xylem. Trifiló et al. (pages 5029– 5039) dissect leaf hydraulic vulnerability and show that both xylem and living tissues may be important. If confirmed and clarified, an important role for outside-xylem hydraulic decline will change our understanding of how plant...
A new species, Phyllanthus mutisianus, is described on the basis of a collection from Colombia made by the expedition of Jose Mutis. It is distinguishable from all other neotropical species of Phyllanthus by virtue of the distinctive leaf venation and very long fruiting pedicels. The type specimen lacks mature flowers, but the vegetative morphology, inflorescence, and fruiting structures sugges...
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