RESUMEN
Kirchhoff thin elastic rod models are important in the study of the mechanism determining the configurations of flexible structures not only at the macroscopic but also at the microscopic scale. In this study, the energy balance method has been well applied to analyze the configuration of a DNA elastic rod in the presence of interfacial traction. An approximate solution for the shape equations has been obtained, and the relationship between the interfacial factor and the configuration of the DNA segment is derived. The results may provide an explanation for the onset of the formation of kinks in DNA when immersed in a solution.
Asunto(s)
ADN/química , Conformación de Ácido Nucleico , Elasticidad , Modelos Moleculares , Soluciones , TermodinámicaRESUMEN
Twenty-four microsatellite markers were isolated from the genomic DNA of Amomum tsaoko Crevost et Lemaire, an important economic plant in China, using the method fast isolation by AFLP of sequences containing repeats (FIASCO). Polymorphism within each locus was assessed in 60 individuals from three populations in Yunnan Province, China, and nine of them were polymorphic. The number of alleles per polymorphic locus was 2, and the expected and observed heterozygosities ranged from 0.224 to 0.513, and from 0.050 to 0.600, respectively. Among nine microsatellite markers with polymorphism, five showed significant deviation from Hardy-Weinberg equilibrium (P < 0.01), probably due to anthropic selection and short-cloning history in cultivation. No significant linkage disequilibrium was detected between loci in our analysis. These polymorphic microsatellite markers will facilitate further studies of gene flow, population structure, identification of cultivated variety, and evaluation of germplasm resources.