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Title: Generation of phase-shifting algorithms with N arbitrarily spaced phase-steps
Author: Castro-Felix, P.
Rosas-Espinoza, V.C.
Diaz-Cardenas, B.
Perez-Valencia, L.I.
Huerta-Martinez, F.M.
Santerre, A.
Issue Date: 2014
Abstract: Ferocactus histrix is a barrel cactus that is widespread in Mexico. A population located in Llanos de Ojuelos, a semiarid zone representative of many disturbed regions in north-central Mexico, was studied. Over a period of 10 years (1997 to 2007), the average number of individuals decreased from 21.95 to 3.53 plants per 300m2. A change in population size structure was also registered over this period of time. In 2008, a plot selected on the basis of plant abundance was established within the population and a genetic analysis was conducted with ISTR and ISSR markers. This analysis revealed low levels of genetic diversity (expected heterozygosity (HE)=0.073, Shannon index (I)=0.113 and HE=0.178, I=0.271, respectively) compared with those of most studied cacti species. The genetic diversity between the different life stages was also evaluated, and a gradual decrease in levels of genetic variation was observed from adults to juveniles and seedlings (HE=0.130, I=0.192 to HE=0.103, I=0.157). These differences, however, were not significant. Loci fixation and a decrease in the frequency of rare alleles were observed in seedling and juvenile classes. The decline in genetic variation may be associated with recent bottlenecks experienced by the population of F.histrix. If the sizes of local populations of F.histrix continue to decrease, genetic variation will be gradually lost, and the risk of extinction will increase. " 2014 The Society for the Study of Species Biology.",,,,,,"10.1111/1442-1984.12028",,,"","",,,,,,"3",,"Plant Species Biology",,"E21
WOS",,,,,,"Bottleneck; ISSR; ISTR; Life stage; Within population",,,,,,"Genetic diversity within a declining natural population of Ferocactus histrix (DC) Lindsay",,"Article" "43466","123456789/35008",,"Ayubi, G.A., Instituto de Física, Facultad de Ingeniería, UdelaR, J. Herrera y Reissig 565Montevideo, Uruguay; Perciante, C.D., Facultad de Ingeniería y Tecnologías, Universidad Católica del Uruguay, Av. 8 de Octubre 2738Montevideo, Uruguay; Flores, J.L., Electronic Engineering Department, University of Guadalajara, Av. Revolución #1500Guadalajara, Jalisco, Mexico; Di Martino, J.M., Instituto de Física, Facultad de Ingeniería, UdelaR, J. Herrera y Reissig 565Montevideo, Uruguay; Ferrari, J.A., Instituto de Física, Facultad de Ingeniería, UdelaR, J. Herrera y Reissig 565Montevideo, Uruguay",,"Ayubi, G.A.
Perciante, C.D.
Flores, J.L.
Di Martino, J.M.
Ferrari, J.A.",,"2014",,"Phase-shifting (PS) is an important technique for phase retrieval in interferometry (and threedimensional profiling by fringe projection) that requires a series of intensity measurements with known phase-steps. Usual PS algorithms are based on the assumption that the phase-steps are evenly spaced. In practice, however, this assumption is often not satisfied exactly, which leads to errors in the recovered phase. In this work we present a systematic algebraic approach for generating general PS algorithms with N arbitrarily spaced phase-steps, which present advantages (e.g., the PS error can be avoided) over known algorithms that assume equally spaced phase-steps. Simulations are presented. " 2014 Optical Society of America
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