we have investigated structure and electronic properties of au and si liner chains using the firstprinciplesplane wave pseudopotential method. the transport properties and conductance of these twoliner chains are studied using landauer approaches based on density functional theory (dft). weobtain density of states and band gap using kohn-sham and wannier functions as well as quantumconductivity...

We study the conductance threshold of clean nearly straight quantum wires in which an electron is bound. We show that such a system exhibits spin-dependent conductance structures on the rising edge to the first conductance plateau, one near 0.25(2e 2 /h), related to a singlet resonance, and one near 0.75(2e 2 /h), related to a triplet resonance. As a quantitative example we solve exactly the sc...

Electrophysiological experiments, obtained primarily from dissociated salamander cells, demonstrate that the K+ conductance of Müller cells is distributed in a highly nonuniform manner over the cell surface. A large fraction of the total cell conductance is localized to that portion of the endfoot process that faces the vitreous humor. Along the remainder of the cell, specific K+ conductance is...

We have studied conductance quantization in metallic nanowires upon adsorption of molecules with different adsorption strengths. The conductance still changes in a step-wise fashion even in the presence of strong adsorption, and the average sharpness, length, and number of the conductance steps remain unchanged. However, the step positions deviate significantly from the integer values of the co...

The conductance of atomic-size contacts has a small, random, voltage dependent component analogous to conductance fluctuations observed in diffusive wires. A new effect is observed in gold contacts, consisting of a marked suppression of these fluctuations when the conductance of the contact is close to integer multiples of the conductance quantum. Using a model based on the Landauer-Büttiker fo...

The regulation of cardiac Cl- conductance by cAMP-dependent protein kinase (PKA) and cellular phosphatases was studied in isolated guinea pig ventricular myocytes by using wide-tipped, perfused pipettes to record whole-cell currents. Exposure to forskolin (Fsk) or isoproterenol (Iso) elicits a Cl- conductance that results exclusively from PKA-dependent phosphorylation because it can be complete...

The conductance distribution of metallic mesoscopic systems is considered. The variance of this distribution describes the universal conductance fluctuations, yielding a Gaussian distribution of the conductance. We calculate diagrammatically the third cumulant of this distribution, the leading deviation from the Gaussian. We confirm random matrix theory calculations that the leading contributio...