Gate-Switchable Molecular Diffusion on a Graphene Field-Effect Transistor.

Controlling the surface diffusion of particles on 2D devices creates opportunities for advancing microscopic processes such as nanoassembly, thin-film growth, and catalysis. Here, we demonstrate the ability to control the diffusion of FTCNQ molecules at the surface of clean graphene field-effect transistors (FETs) via electrostatic gating. Tuning the back-gate voltage () of a graphene FET switches molecular adsorbates between negative and neutral charge states, leading to dramatic changes in their diffusion properties.

Tuning a Two-Impurity Kondo System by a Moiré Superstructure.

Two-impurity Kondo models are paradigmatic for correlated spin-fermion systems. Working with Mn atoms on Au(111) covered by a monolayer of MoS_{2}, we tune the interadatom exchange via the adatom distance and the adatom-substrate exchange via the location relative to a moiré structure of the substrate. Differential-conductance measurements on isolated adatoms exhibit Kondo peaks with heights depending on the adatom location relative to the moiré structure.

Moiré Tuning of Spin Excitations: Individual Fe Atoms on MoS_{2}/Au(111).

Magnetic adatoms on properly designed surfaces constitute exquisite systems for addressing, controlling, and manipulating single quantum spins. Here, we show that monolayers of MoS_{2} on a Au(111) surface provide a versatile platform for controllably tuning the coupling between adatom spins and substrate electrons. Even for equivalent adsorption sites with respect to the atomic MoS_{2} lattice, we observe that Fe adatoms exhibit behaviors ranging from pure spin excitations, characteristic of negligible exchange and dominant single-ion anisotropy, to a fully developed Kondo resonance, indicating strong exchange and negligible single-ion anisotropy.

[Eosinophilic reactions in bronchial asthma patients and the possibilities to neutralize them under sanatorium treatment].

Patients with eosinophilic variant of bronchial asthma demonstrate high levels of fibrinolytic activity in their bronchial secretion along with low content in same of Ig A, as evidenced by findings obtained in the course of sanatorium treatment. There is usually no correlation between the above changes and routine methods of health resort treatment. The judicious employment in a complex of therapeutic measures of aerosols of hydrocarbonate of sodium and heparin promotes neutralization of cationic proteins and large major protein of eosinophiles in the bronchial lumen whereby there occurs normalization of Ig A levels in the sputum along with lowering of its fibrinolytic activity.

[A comparative evaluation of the efficacy of immunocorrection in children with bronchial asthma living in ecologically contrasted regions].

Overall 50 children suffering from infectious-allergic bronchial asthma who live in ecologically contrasting regions were examined. Those children residing in unfavourable, in terms of ecological conditions, regions demonstrated diminution of the peripheral blood T-lymphocytes together with a decrease in their functional activity as well as in the activity of interleukin 2. It is in this group of children that immunomodulating effect of thymalin is less apparent.