Search results for "Dna dynamics"

showing 2 items of 2 documents

Endogenous fluctuations of DNA topology in the chloroplast of Chlamydomonas reinhardtii.

1998

DNA supercoiling in the chloroplast of the unicellular green alga Chlamydomonas reinhardtii was found to change with a diurnal rhythm in cells growing in alternating 12-h dark-12-h light periods. Highest and lowest DNA superhelicities occurred at the beginning and towards the end of the 12-h light periods, respectively. The fluctuations in DNA supercoiling occurred concurrently and in the same direction in two separate parts of the chloroplast genome, one containing the genes psaB, rbcL, and atpA and the other containing the atpB gene. Fluctuations were not confined to transcribed DNA regions, indicating simultaneous changes in DNA conformation all over the chloroplast genome. Because the d…

ChloroplastsLightTranscription GeneticGenes ProtozoanChlamydomonas reinhardtiiTopologyGenomechemistry.chemical_compoundGenes ReporterAnimalsRNA MessengerMolecular BiologyGenebiologyDNA SuperhelicalChlamydomonasfood and beveragesCell Biologybiology.organism_classificationDNA Dynamics and Chromosome StructureCircadian RhythmChloroplastCross-Linking ReagentschemistryChloroplast DNAGene Expression RegulationDNA supercoilNucleic Acid ConformationDNAChlamydomonas reinhardtiiMolecular and cellular biology
researchProduct

Dynamics of breather modes in a nonlinear “helicoidal” model of DNA

1991

Via a recent model with an additional helicoidal coupling, the dynamics of breathers modes in DNA are studied analytically and with the use of numerical simulations. It is shown that these excitations are longlived and can match experimentally observed fluctuational openings.

PhysicsQuantitative Biology::BiomoleculesCoupling (physics)Nonlinear systemClassical mechanicsDna dynamicsBreatherDynamics (mechanics)General Physics and AstronomyMorse potentialPhysics Letters A
researchProduct