The Experts below are selected from a list of 942039 Experts worldwide ranked by ideXlab platform
José Alexandre F. Diniz-filho - One of the best experts on this subject based on the ideXlab platform.
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Multi-objective optimization for plant germplasm collection conservation of genetic resources based on molecular variability
Tree Genetics & Genomes, 2015Co-Authors: Shana Schlottfeldt, Maria Emília M. T. Walter, André Carlos P. L. F. Carvalho, Thannya N. Soares, Mariana P. C. Telles, Rafael D. Loyola, José Alexandre F. Diniz-filhoAbstract:Germplasm collections play a significant role among strategies for conservation of diversity. It is common to select a core collection to represent the genetic diversity of a germplasm collection, in order to minimize the cost of conservation, while ensuring the maximization of genetic variation. We aimed to solve two main problems: (1) to select a set of individuals, from an in situ data set, that is genetically complementary to an existing germplasm collection, and (2) to define a core collection for a germplasm collection. We proposed a new multi-objective optimization (MOO) approach based on principles of systematic conservation planning (SCP) incorporating heterozygosity information; therefore, optimization takes genotypic diversity and variability patterns into account as well. As a case study, we used Dipteryx alata microsatellite loci information from two sources, an ex situ germplasm collection located at the Agronomy School of the Federal University of Goiás (UFG-AS), and an in situ data set composed of 642 sampled individual trees. We were able to identify within a population of several individuals, the exact accessions/samples that should be chosen in order to preserve the species diversity. We found that material from nine in situ individual trees are enough to complement the UFG-AS germplasm collection as it is, and that it is possible to define a core collection of 20 individual trees representing all studied genetic diversity. Moreover, we defined a method (a protocol) to deal with large amounts of accessions in the context of MOO. The proposed approach can be used to help constructing collections with maximal allelic richness and can also be extended to the in situ conservation. As far as we know, this is the first time that principles of SCP and the MOO approach are applied to the problem of complementing a germplasm collection and of finding a core collection for a germplasm collection.
Michael Bass - One of the best experts on this subject based on the ideXlab platform.
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very large core single mode gain guided index antiguided fiber lasers
Optics Letters, 2007Co-Authors: Ying Chen, Timothy S Mccomb, Vikas Sudesh, Martin Richardson, Michael BassAbstract:Lowest-order, single-mode laser oscillation is reported in gain-guided index-antiguided fiber lasers having core diameters from 100 to 400 μm. A model is presented explaining how to select resonator mirrors to assure single-mode operation.
Nasser N Peyghambarian - One of the best experts on this subject based on the ideXlab platform.
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single mode fiber laser based on core cladding mode conversion
Optics Letters, 2008Co-Authors: S Suzuki, Axel Schülzgen, Nasser N PeyghambarianAbstract:A single-mode fiber laser based on an intracavity core-cladding mode conversion is demonstrated. The fiber laser consists of an Er-doped active fiber and two fiber Bragg gratings. One Bragg grating is a core-cladding mode converter, and the other Bragg grating is a narrowband high reflector that selects the lasing wavelength. Coupling a single core mode and a single cladding mode by the grating mode converter, the laser operates as a hybrid single-mode laser. This approach for designing a laser cavity provides a much larger mode area than conventional large-mode-area step-index fibers.
Shana Schlottfeldt - One of the best experts on this subject based on the ideXlab platform.
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Multi-objective optimization for plant germplasm collection conservation of genetic resources based on molecular variability
Tree Genetics & Genomes, 2015Co-Authors: Shana Schlottfeldt, Maria Emília M. T. Walter, André Carlos P. L. F. Carvalho, Thannya N. Soares, Mariana P. C. Telles, Rafael D. Loyola, José Alexandre F. Diniz-filhoAbstract:Germplasm collections play a significant role among strategies for conservation of diversity. It is common to select a core collection to represent the genetic diversity of a germplasm collection, in order to minimize the cost of conservation, while ensuring the maximization of genetic variation. We aimed to solve two main problems: (1) to select a set of individuals, from an in situ data set, that is genetically complementary to an existing germplasm collection, and (2) to define a core collection for a germplasm collection. We proposed a new multi-objective optimization (MOO) approach based on principles of systematic conservation planning (SCP) incorporating heterozygosity information; therefore, optimization takes genotypic diversity and variability patterns into account as well. As a case study, we used Dipteryx alata microsatellite loci information from two sources, an ex situ germplasm collection located at the Agronomy School of the Federal University of Goiás (UFG-AS), and an in situ data set composed of 642 sampled individual trees. We were able to identify within a population of several individuals, the exact accessions/samples that should be chosen in order to preserve the species diversity. We found that material from nine in situ individual trees are enough to complement the UFG-AS germplasm collection as it is, and that it is possible to define a core collection of 20 individual trees representing all studied genetic diversity. Moreover, we defined a method (a protocol) to deal with large amounts of accessions in the context of MOO. The proposed approach can be used to help constructing collections with maximal allelic richness and can also be extended to the in situ conservation. As far as we know, this is the first time that principles of SCP and the MOO approach are applied to the problem of complementing a germplasm collection and of finding a core collection for a germplasm collection.
Ying Chen - One of the best experts on this subject based on the ideXlab platform.
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very large core single mode gain guided index antiguided fiber lasers
Optics Letters, 2007Co-Authors: Ying Chen, Timothy S Mccomb, Vikas Sudesh, Martin Richardson, Michael BassAbstract:Lowest-order, single-mode laser oscillation is reported in gain-guided index-antiguided fiber lasers having core diameters from 100 to 400 μm. A model is presented explaining how to select resonator mirrors to assure single-mode operation.
