Quasiprojectile breakup and isospin equilibration at Fermi energies: an indication of longer projectile-target contact times?

An investigation of the quasiprojectile breakup channel in semiperipheral and peripheral collisions of $^{58,64}$Ni+$^{58,64}$Ni at 32 and 52 MeV/nucleon is presented. Data have been acquired in the first experimental campaign of the INDRA-FAZIA apparatus in GANIL. The effect of isospin diffusion between projectile and target in the two asymmetric reactions has been highlighted by means of the isospin transport ratio technique, exploiting the neutron-to-proton ratio of the quasiprojectile reconstructed from the two breakup fragments. We found evidence that, for the same reaction centrality, a higher degree of relaxation of the initial isospin imbalance is achieved in the breakup channel with respect to the more populated binary output, possibly indicating the indirect selection of specific dynamical features. We have proposed an interpretation based on different average projectile-target contact times related to the two exit channels under investigation, with a longer interaction for the breakup channel. The time information has been extracted from AMD simulations of the studied systems coupled to GEMINI++: the model calculations support the hypothesis hereby presented

A kinetic model of sugar metabolism in peach fruit reveals a functional hypothesis of markedly low fructose-to-glucose ratio phenotype

International audienceThe concentrations of sugars in fruit vary with fruit development, environment, and genotype.In general, there were weak correlations between the variations in sugar concentrations andthe activities of enzymes directly related with the synthesis or degradation of sugars. Thisfinding suggests that the relationships between enzyme activities and metabolites are oftennon-linear and are difficult to assess. To simulate the concentrations of sucrose, glucose,fructose and sorbitol during the development of peach fruits, a kinetic model of sugarmetabolism was developed by taking advantage of recent profiling data. Cellcompartmentation (cytosol and vacuole) was described explicitly, and data-driven enzymeactivities were used to parameterize equations. The model correctly accounts for both annualand genotypic variations, which were observed in ten genotypes derived from an interspecificcross. They provided important information on mechanisms underlying the specification ofphenotypic differences. In particular,the model supports the hypothesis that a difference infructokinase affinity could be responsible for a low fructose-to-glucose ratio phenotype,which was observed in the studied population

Effect of water stress applied during the final stage of rapid growth on peach trees (cv. Big-Top)

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Xylemic, phloemic and transpiration flows to and from a peach

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Croissance chez la pêche : alimentation en assimilats et en eau

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Croissance chez la pêche : alimentation en assimilats et en eau

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