منابع مشابه
Plant Competition Underground
Belowground competition occurs when plants decrease the growth, survival, or fecundity of neighbors by reducing available soil resources. Competition belowground can be stronger and involve many more neighbors than aboveground competition. Physiological ecologists and population or community ecologists have traditionally studied belowground competition from different perspectives. Physiological...
متن کاملOscillation frequencies of tapered plant stems.
Free oscillations of upright plant stems, or in technical terms, slender tapered rods with one end free, can be described by considering the equilibrium between bending moments in the form of a differential equation with appropriate boundary conditions. For stems with apical loads, where the mass of the stem is negligible, Mathematica 4.0 returns solutions for tapering modes α = 0, 0.5, and 1. ...
متن کاملPlant Signaling: Notes from the Underground
New studies combining genetic and grafting approaches in Arabidopsis provide evidence that a carotenoid derivative is a novel plant signaling molecule through which roots can influence shoot branching and leaf development.
متن کاملMethods for calculating factors of safety for plant stems.
The concept of a 'factor of safety' is used by biologists and engineers who generally agree that structures must be mechanically reliable, i.e. that structures must be capable of coping with unprecedented loads without failing. These factors can be calculated for individual structures or for a population of otherwise equivalent mechanical structures differing in their load capabilities. Objecti...
متن کاملThe development of plant roots: new approaches to underground problems.
The roots of terrestriaf plants are involved in the acquisition of water and nutrients, anchorage of the plant, synthesis of plant hormones, and storage functions. The development of a root system involves strategies that are common to the development of all plant organs, as well as certain aspects that are unique to roots. Despite the importance of roots and some unusual developmental characte...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1901
ISSN: 0036-8733
DOI: 10.1038/scientificamerican03091901-21066bsupp