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Current Opinion in Plant Biology, 2011
Leaves are formed from a group of initial cells within the meristem. One of the earliest markers of leaf initiation is the down-regulation of KNOX genes in initial cells. Polar auxin activity, MYB and LOB domain transcription factors function to keep KNOX out of the initiating leaf. If KNOX genes are expressed in initial cells, leaves fail to form.
Jihyun, Moon, Sarah, Hake
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Leaves are formed from a group of initial cells within the meristem. One of the earliest markers of leaf initiation is the down-regulation of KNOX genes in initial cells. Polar auxin activity, MYB and LOB domain transcription factors function to keep KNOX out of the initiating leaf. If KNOX genes are expressed in initial cells, leaves fail to form.
Jihyun, Moon, Sarah, Hake
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Automatic leaf shape category discovery
2016 23rd International Conference on Pattern Recognition (ICPR), 2016Categorical description of leaf shapes is of paramount importance in agriculture and plant sciences. Traditionally, these descriptions have been based on categorical systems proposed by domain experts. Despite the importance of these visual descriptive systems, these approaches may be limited by the representation of unknown shapes as expected in ...
Leonel Olivares +2 more
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Leaf Image Retrieval with Shape Features
2000In this paper we present an efficient two-step approach of using a shape characterization function called centroid-contour distance curve and the object eccentricity (or elongation) for leaf image retrieval. Both the centroid-contour distance curve and the eccentricity of a leaf image are scale, rotation, and translation invariant after proper ...
Zhiyong Wang 0001 +3 more
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Fractal analysis of leaf shapes
Canadian Journal of Forest Research, 1986An application of fractal mathematics to the analysis of leaf shapes is presented. Six leaves randomly selected from nine tree species were used in the study. A video imaging method together with microcomputer-based image processing was used to generate leaf outlines.
J. Vlcek, E. Cheung
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Search Image for Leaf Shape in a Butterfly
Science, 1978The butterfly Battus philenor forms search images for leaf shape when searching for its two larval host plants in southeast Texas. This behavior increases the rate of discovery of host plants and permits females to track changes in relative host plant suitability for larval growth. Apostatic selection resulting from
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Science, 2003
The flat shape of most leaves enables them to capture sunlight for photosynthesis more efficiently. But how do leaves develop their flat shape? In their Perspective, [McConnell and Barton][1] discuss new work ([ Nath et al ][2].) that reveals how the differential expression of certain genes within developing leaves of the snapdragon makes these leaves ...
J. R. McConnell, M. K. Barton
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The flat shape of most leaves enables them to capture sunlight for photosynthesis more efficiently. But how do leaves develop their flat shape? In their Perspective, [McConnell and Barton][1] discuss new work ([ Nath et al ][2].) that reveals how the differential expression of certain genes within developing leaves of the snapdragon makes these leaves ...
J. R. McConnell, M. K. Barton
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Sinuosity Coefficients for Leaf Shape Characterisation
2015The design of an efficient and automated model for plant recognition and classification will give the possibility to people with little or no botanical knowledge to conduct field work. In this paper a feature for leaf shape analysis is presented: the Sinuosity coefficients.
Jules R. Kala +2 more
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Archives of Dermatology, 1968
White macules are present in more than 50% of the patients with tuberous sclerosis when no other visible lesions typical of tuberous sclerosis have appeared; the majority, if not all, of the white macules appear at birth. In fair-skinned infants the lesions may be easily overlooked and may only be detected with Wood's light.
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White macules are present in more than 50% of the patients with tuberous sclerosis when no other visible lesions typical of tuberous sclerosis have appeared; the majority, if not all, of the white macules appear at birth. In fair-skinned infants the lesions may be easily overlooked and may only be detected with Wood's light.
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Leafing through Irregular Shapes
Mathematics Teaching in the Middle School, 2015By the time middle school students start a prealgebra course, they should have explored a variety of familiar two-dimensional and three-dimensional shapes and should have been exposed to the concepts of perimeter, area, and volume. They know that they can assign numerical values to some attributes of a shape, such as length and surface area.
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