Biomedical subjects

G Cuniberti

Publications and source records attributed to G Cuniberti.

4 recordsLinked to original sources

PubMed2005

Quantum transport through a DNA wire in a dissipative environment.

Electronic transport through DNA wires in the presence of a strong dissipative environment is investigated. We show that new bath-induced electronic states are formed within the band gap. These states show up in the linear conductance spectrum as a temperature dependent background and lead to a crossover from tunneling to thermal activated behavior with increasing temperature. Depending on the strength of the electron-bath coupling, the conductance at the Fermi level can show a weak exponential or even an algebraic length dependence. Our results suggest a new environmentally induced transport mechanism. This might be relevant for the understanding of molecular conduction experiments in liquid solution, such as those recently performed on poly(GC) oligomers in a water buffer (B. Xu et al., Nano Lett. 2004, 4, 1105).

Biophysical Phenomena↗

PubMed2004

Model evaluation for glycolytic oscillations in yeast biotransformations of xenobiotics.

Anaerobic glycolysis in yeast perturbed by the reduction of xenobiotic ketones is studied numerically in two models which possess the same topology but different levels of complexity. By comparing both models' predictions for concentrations and fluxes as well as steady or oscillatory temporal behavior we answer the question what phenomena require what kind of minimum model abstraction. While mean concentrations and fluxes are predicted in agreement by both models we observe different domains of oscillatory behavior in parameter space. Generic properties of the glycolytic response to ketones are discussed.

Acetaldehyde↗

PubMed2003

A three terminal ring interferometer logic gate.

We propose a carbon-based logic gate where and, or, and xor logic operations are available. It consists of a carbon nanotube (CNT) ring coupled to three external CNT-leads, two of them used as input channels, and the third as the output channel. The total transmission for two inputs displays characteristic interference effects. The constructive interference leads to total transmission significantly larger than that for a single input and validates and gates, whereas the destructive interference corresponds to xor gates. For or gates a negligible interference between the transmittance of each single inputs is needed.

Computer Simulation↗

PubMed2002

Correlated tunneling in intramolecular carbon nanotube quantum dots.

We investigate correlated electronic transport in single-walled carbon nanotubes with two intramolecular tunneling barriers. We suggest that below a characteristic temperature the long-range nature of the Coulomb interaction becomes crucial to determine the temperature dependence of the maximum G(max) of the conductance peak. Correlated sequential tunneling dominates transport yielding the power law G(max) proportional, variant T(alpha(end-end)-1), typical for tunneling between the ends of two Luttinger liquids. Our predictions are in agreement with recent measurements.

Journal Article↗