Results 211 to 220 of about 56,263 (251)
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Pith width, leaf size, and twig thickness
American Journal of Botany, 2021AbstractPremiseTo support large leaves, many woody plant species evolved a cost‐effective way to thicken twigs. As an extension of E. J. H. Corner's rule that twig diameter increases with leaf size, we hypothesized that pith width also increases with leaf size.
Kalindhi A. Larios Mendieta +2 more
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What Is the Optimum Leaf Width of a Multileaf Collimator?
Medical Physics, 2000The following question is investigated: How narrow do the leaves of a multileaf collimator have to be such that further reduction of the leaf width does not lead to physical improvements of the dose distribution. Because of the physical principles of interaction between radiation and matter, dose distributions in radiotherapy are generally relatively ...
S Nill, T Bortfeld, U Oelfke
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Proportional Relationship Between Leaf Area and the Product of Leaf Length and Width of Four Types of Special Leaf Shapes [PDF]
Forests, 2019 The leaf area, as an important leaf functional trait, is thought to be related to leaf length and width. Our recent study showed that the Montgomery equation, which assumes that leaf area is proportional to the product of leaf length and width, applied to different leaf shapes, and the coefficient of proportionality (namely the Montgomery parameter ...
Johan Gielis +2 more
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Optimizing leaf widths for a multileaf collimator
Physics in Medicine and Biology, 2009The multileaf collimator (MLC) is becoming a standard accessory of modern linac in shaping radiation fields. However, for a given target (projection), the radiation field shaped by an MLC has a stepwise boundary and is not identical to the desired field that exactly conforms to the target.
Weijie, Cui, Jianrong, Dai
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Leaf Primordium Size Specifies Leaf Width and Vein Number Among Row-Type Classes in Barley [PDF]
Plant Journal, 2017 SummaryExploring genes with impact on yield‐related phenotypes is the preceding step to accomplishing crop improvements while facing a growing world population. A genome‐wide association scan on leaf blade area (LA) in a worldwide spring barley collection (Hordeum vulgare L.), including 125 two‐ and 93 six‐rowed accessions, identified a gene encoding ...
Jochen Kumlehn +2 more
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Aquatic Conservation: Marine and Freshwater Ecosystems, 2011
ABSTRACT Conservation and remediation projects for Zostera marina populations require easy and economical methods for non‐destructive approximations of leaf area. Allometric models provide a reliable approach for estimating biomass in terms of leaf area, and the length‐times‐width proxy for leaf area is widely used. Although leaf length of Z.
Hector Echavarria‐Heras +3 more
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ABSTRACT Conservation and remediation projects for Zostera marina populations require easy and economical methods for non‐destructive approximations of leaf area. Allometric models provide a reliable approach for estimating biomass in terms of leaf area, and the length‐times‐width proxy for leaf area is widely used. Although leaf length of Z.
Hector Echavarria‐Heras +3 more
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BREEDING PEACH FOR NARROW LEAF WIDTH
Acta Horticulturae, 2002Mature peach leaves are typically about 4 x 16 cm, with a width/length ratio of about 25%. A narrow leaf seedling, selected by Wayne Sherman (Univ. of Florida, Gainesville), was hybridized at USDA-Byron with adapted commercial varieties. Early generation hybrids produced small, irregular-shaped fruit.
W.R. Okie, Ralph Scorza
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Exploration of Genetic Selection in Rice Leaf Length and Width
Botany, 2018Leaf length and width are two of the most important components of rice (Oryza sativa L.) plant architecture and directly contribute to yield. The genetic effects of leaf length and width are controlled by quantitative trait loci (QTLs). In this study, a double haploid (DH) population derived from a cross of O. sativa subsp. japonica cultivar ‘Maybelle’
Xinghua Wei +2 more
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Influence of MLC leaf width on biologically adapted IMRT plans
Acta Oncologica, 2010High resolution beam delivery may be required for optimal biology-guided adaptive therapy. In this work, we have studied the influence of multi leaf collimator (MLC) leaf widths on the treatment outcome following adapted IMRT of a hypoxic tumour.Dynamic contrast enhanced MR images of a dog with a spontaneous tumour in the nasal region were used to ...
Jan, Rødal +2 more
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GPA1 is a determinant of leaf width and fruit size in tomato
Plant ScienceThe identification and dissection of the genetic foundations underlying natural variations in crop species are critical for understanding their phenotypic diversity and for subsequent application in selective breeding. In this research, we identify a natural polymorphism in the promoter region of the G protein α subunit 1 (GPA1) gene, which is ...
Xiang, Wang +3 more
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