Size effect in ion transport through angstrom-scale slits

Structural changes in bacteriorhodopsin during ion transport at 2 angstrom resolution.

Crystal structures of the Asp96 to Asn mutant of the light-driven proton pump bacteriorhodopsin and its M photointermediate produced by illumination at ambient temperature have been determined to 1.8 and 2.0 angstroms resolution, respectively. The trapped photoproduct corresponds to the late M state in the transport cycle-that is, after proton transfer to Asp85 and release of a proton to the ex...

Ion transport through biological channels

The transport of ions across single-molecule protein nanochannels is important both in the biological context and in proposed nanotechnological applications. Here we discuss these systems from the perspective of non-equilibrium physics, and in particular, whether the concepts underlying the physics of diffusive and electrokinetic transport can be employed to predict and understand these systems...

Angstrom-scale flatness using selective nanoscale etching

The realization of flat surfaces on the angstrom scale is required in advanced devices to avoid loss due to carrier (electron and/or photon) scattering. In this work, we have developed a new surface flattening method that involves near-field etching, where optical near-fields (ONFs) act to dissociate the molecules. ONFs selectively generated at the apex of protrusions on the surface selectively...

Nucleic acid nanotechnology-towards Angstrom-scale engineering.

Nucleic acids and analogues are suitable building blocks for reliable self-assembly of nanometer-sized two- or three-dimensional materials. In order to mimic or approach nature with respect to size and function, Angstrom-scale chemical engineering is emerging as pivotal for future developments. Efforts within nucleic acid nanotechnology will be focussed on generating rigid and stable low nanome...

Selective Transport of Propylene by Silver Ion Complex Through an Immobilized Liquid Membrane