The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Sue Whitesides - One of the best experts on this subject based on the ideXlab platform.
-
Simultaneous dominance representation of multiple posets
Order, 1996Co-Authors: Paul J. Tanenbaum, Sue WhitesidesAbstract:We characterize the Codominance pairs -pairs of posets that admit simultaneous dominance representations in the ( x, y )-and ( −x, y )-coordinate systems-and present a linear algorithm to recognize them and construct Codominance representations. We define dominance polysemy as a generalization of Codominance and describe several related problems and preliminary results.
-
Simultaneous Dominance Representation of Multiple Posets
1995Co-Authors: J. Tanenbaum, Sue WhitesidesAbstract:We characterize he {\em Codominance pairs} pairs of posets that admit simultaneous dominance representations in the $(x,y)$- and $(-x,y)$-coordinate systems and present a linear algorithm to recognize them and construct Codominance representations. We define {\em dominance polysemy} as a generalization of Codominance and describe several related problems and preliminary results.
Paul J. Tanenbaum - One of the best experts on this subject based on the ideXlab platform.
-
Simultaneous dominance representation of multiple posets
Order, 1996Co-Authors: Paul J. Tanenbaum, Sue WhitesidesAbstract:We characterize the Codominance pairs -pairs of posets that admit simultaneous dominance representations in the ( x, y )-and ( −x, y )-coordinate systems-and present a linear algorithm to recognize them and construct Codominance representations. We define dominance polysemy as a generalization of Codominance and describe several related problems and preliminary results.
Martin J. Lechowicz - One of the best experts on this subject based on the ideXlab platform.
-
Codominance of acer saccharum and fagus grandifolia the role of fagus root sprouts along a slope gradient in an old growth forest
Journal of Plant Research, 2010Co-Authors: Ken Arii, Koichi Takahashi, Martin J. LechowiczAbstract:We studied how the unusual capacity of mature Fagus grandifolia to form clumps of clonal stems from root sprouts can contribute to its frequent Codominance with Acer saccharum in southern Quebec, Canada. In an old-growth forest, the degree of dominance by the two species shifted along topographic gradients spanning a few hundreds of meters, with Fagus more frequent on lower slopes and Acer on upper slopes. The frequency distribution of Fagus stem diameter had an inverse J distribution at all slope positions, which is indicative of continuous recruitment. Acer stem diameter also had an inverse J pattern, except at lower slope positions where size structure was discontinuous. For stems <2 m tall, Fagus regenerated mainly by sprouts at the upper and mid-slopes, while regeneration from seed was more pronounced on the lower slope. This change of regeneration mode affected the spatial pattern of Fagus stems. Understory trees of Fagus were positively correlated with conspecific canopy trees on upper and mid-slopes, but not on lower slopes where Fagus regenerated mainly by seedlings. Understory trees of Acer were positively correlated with conspecific canopy trees only on the mid-slope. There were many Fagus seedlings around Acer canopy trees at the lower slope, suggesting the potential replacement of Acer canopy trees by Fagus. This study suggests that the regeneration traits of the two species changed with slope position and that Fagus patches originating from root sprouts can contribute to the maintenance of Acer–Fagus Codominance at the scale of local landscapes.
-
Codominance of Acer saccharum and Fagus grandifolia: the role of Fagus root sprouts along a slope gradient in an old-growth forest.
Journal of Plant Research, 2010Co-Authors: Koichi Takahashi, Ken Arii, Martin J. LechowiczAbstract:We studied how the unusual capacity of mature Fagus grandifolia to form clumps of clonal stems from root sprouts can contribute to its frequent Codominance with Acer saccharum in southern Quebec, Canada. In an old-growth forest, the degree of dominance by the two species shifted along topographic gradients spanning a few hundreds of meters, with Fagus more frequent on lower slopes and Acer on upper slopes. The frequency distribution of Fagus stem diameter had an inverse J distribution at all slope positions, which is indicative of continuous recruitment. Acer stem diameter also had an inverse J pattern, except at lower slope positions where size structure was discontinuous. For stems
Koichi Takahashi - One of the best experts on this subject based on the ideXlab platform.
-
Codominance of acer saccharum and fagus grandifolia the role of fagus root sprouts along a slope gradient in an old growth forest
Journal of Plant Research, 2010Co-Authors: Ken Arii, Koichi Takahashi, Martin J. LechowiczAbstract:We studied how the unusual capacity of mature Fagus grandifolia to form clumps of clonal stems from root sprouts can contribute to its frequent Codominance with Acer saccharum in southern Quebec, Canada. In an old-growth forest, the degree of dominance by the two species shifted along topographic gradients spanning a few hundreds of meters, with Fagus more frequent on lower slopes and Acer on upper slopes. The frequency distribution of Fagus stem diameter had an inverse J distribution at all slope positions, which is indicative of continuous recruitment. Acer stem diameter also had an inverse J pattern, except at lower slope positions where size structure was discontinuous. For stems <2 m tall, Fagus regenerated mainly by sprouts at the upper and mid-slopes, while regeneration from seed was more pronounced on the lower slope. This change of regeneration mode affected the spatial pattern of Fagus stems. Understory trees of Fagus were positively correlated with conspecific canopy trees on upper and mid-slopes, but not on lower slopes where Fagus regenerated mainly by seedlings. Understory trees of Acer were positively correlated with conspecific canopy trees only on the mid-slope. There were many Fagus seedlings around Acer canopy trees at the lower slope, suggesting the potential replacement of Acer canopy trees by Fagus. This study suggests that the regeneration traits of the two species changed with slope position and that Fagus patches originating from root sprouts can contribute to the maintenance of Acer–Fagus Codominance at the scale of local landscapes.
-
Codominance of Acer saccharum and Fagus grandifolia: the role of Fagus root sprouts along a slope gradient in an old-growth forest.
Journal of Plant Research, 2010Co-Authors: Koichi Takahashi, Ken Arii, Martin J. LechowiczAbstract:We studied how the unusual capacity of mature Fagus grandifolia to form clumps of clonal stems from root sprouts can contribute to its frequent Codominance with Acer saccharum in southern Quebec, Canada. In an old-growth forest, the degree of dominance by the two species shifted along topographic gradients spanning a few hundreds of meters, with Fagus more frequent on lower slopes and Acer on upper slopes. The frequency distribution of Fagus stem diameter had an inverse J distribution at all slope positions, which is indicative of continuous recruitment. Acer stem diameter also had an inverse J pattern, except at lower slope positions where size structure was discontinuous. For stems
Marie Kaminski - One of the best experts on this subject based on the ideXlab platform.
-
Molecular basis for heterosis in the chicken-quail hybrid
Comparative Biochemistry and Physiology B, 2010Co-Authors: Gérard Lucotte, Arthur Perramon, Marie KaminskiAbstract:Abstract 1. 1. Electrophoretical and immunological comparative study of blood proteins and enzymes of the cock-quail hybrid and the parental blood was performed. 2. 2. The investigated blood proteins and enzymes of the hybrid fall into following three categories: mainly one of the parental components is present; both parental components are present: a hybrid molecule is present showing intermediate electrophoretic migration. 3. 3. These three categories correspond to the three mechanisms of heterosis, respectively the dominance, the Codominance and the overdominance.
-
Heterosis in the Codominance model: electrophoretic studies of proteins in the chicken-quail hybrid.
Comparative Biochemistry and Physiology B, 2010Co-Authors: Gérard Lucotte, Marie Kaminski, Arthur PerramonAbstract:Abstract 1. 1. Electrophoretical comparisons was carried out on qualitative and quantitative differences of three proteins in the cock-quail hybrid: albumin, immunoglobulin and hemoglobin. All three components correspond to situations of Codominance. 2. 2. Heterosis was demonstrated twice: the immunological potentialities of the hybrid are increased by its possession of two types of Ig G; the affinity of hemoglobin for oxygen can be better regulated in the hybrid than in both parental species. 3. 3. Proportions of the codominant parental components in the hybrid are different in the case of the three investigated proteins; this fact probably reflects the relative importance of the quantitative regulation of gene products in the hybrid.