Active transport of proline was observed in both electron transport particles and cell membrane ghosts from Mycobacterium phlei. The transport of proline was dependent upon substrate oxidation and the presence of Li+ or Na+, but not upon the formation of a high energy phosphorylated intermediate. The requirement for Na+ was different from Na+ coupled transport systems which have been described;...

Active transport of proline was observed in both electron transport particles and cell membrane ghosts from Mycobacterium phlei. The transport of proline was dependent upon substrate oxidation and the presence of Li+ or Na+, but not upon the formation of a high energy phosphorylated intermediate. The requirement for Na+ was different from Na+ coupled transport systems which have been described;...

Light-driven electron transport is coupled to ATP synthesis in chloroplasts. While the nature of the coupling and the structures of key components are now known, there has long been disagreement over pathways of electron transport. Recent results now put an old idea back on the agenda-cyclic electron transport around photosystem I.

We present a theory of full counting statistics for electron transport through interacting electron systems with non-Markovian dynamics. We illustrate our approach for transport through a single-level quantum dot and a metallic single-electron transistor to second order in the tunnel coupling, and discuss under which circumstances non-Markovian effects appear in the transport properties.

Oxide heterointerfaces are ideal for investigating strong correlation effects to electron transport, relevant for oxide-electronics. Using hot-electrons, we probe electron transport perpendicular to the La₀.₇Sr₀.₃MnO₃ (LSMO)- Nb-doped SrTiO₃ (Nb:STO) interface and find the characteristic hot-electron attenuation length in LSMO to be 1.48 ± 0.10 unit cells (u.c.) at -1.9 V, increasing to 2.02 ± ...

We show that polymer light-emitting diodes with high work-function cathodes and conjugated polyelectrolyte injection/transport layers exhibit excellent efficiencies despite large electron-injection barriers. Correlation of device response times with structure provides evidence that the electron-injection mechanism involves redistribution of the ions within the polyelectrolyte electron-transport...

LEO P. KOUWENHOVEN, CHARLES M. MARCUS, PAUL L. MCEUEN, SEIGO TARUCHA, ROBERT M. WESTERVELT, AND NED S. WINGREEN 6 (alphabetical order). 1. Department of Applied Physics, Delft University of Technology, P.O.Box 5046, 2600 GA Delft, The Netherlands. 2. Department of Physics, Stanford University, Stanford, CA 94305, USA 3. Department of Physics, University of California and Materials Science Divis...

In This Issue In This Issue Rafts and the evil amyloids ipid rafts are bad news for those with Alzheimer's disease (AD). On page 113, Ehehalt et al. show that formation of the ␤-amyloid peptide (A ␤), which is tightly linked to AD, depends on the raft association of one of its creators. The creating enzyme is ␤-secretase, which cleaves the amyloid precursor protein (APP) to release a product th...

We consider thermodynamic and transport properties of a long granular array with strongly connected grains (intergrain conductance g>>1). We find that the system's conductance and differential capacitance exhibits activated behavior, approximately exp([-T(*)/T]. The gap T(*) represents the energy needed to create a long single-electron charge soliton propagating through the array. This scale is...