Dirac Electrons with Molecular Relaxation Time at Electrochemical Interface between Graphene and Water.

The time dynamics of charge accumulation at the electrochemical interface between graphene and water is important for supercapacitors, batteries, and chemical and biological sensors. By using impedance spectroscopy, we have found that measured capacitance (C) at this interface with the gate voltage V ≈ 0.1 V follows approximate laws C~T and C~T (T is V period) in frequency ranges (1000-50,000) Hz and (0.

General Capacitance Upper Limit and Its Manifestation for Aqueous Graphene Interfaces.

Double-layer capacitance (C) is essential for chemical and biological sensors and capacitor applications. The correct formula for C is a controversial subject for practically useful graphene interfaces with water, aqueous solutions, and other liquids. We have developed a model of C, considering the capacitance of a charge accumulation layer (C) and capacitance (C) of a capacitance-limiting edge region with negligible electric susceptibility and conductivity between this layer and the capacitor electrode.

Deep Learning Segmentation of Complex Features in Atomic-Resolution Phase-Contrast Transmission Electron Microscopy Images.

Phase-contrast transmission electron microscopy (TEM) is a powerful tool for imaging the local atomic structure of materials. TEM has been used heavily in studies of defect structures of two-dimensional materials such as monolayer graphene due to its high dose efficiency. However, phase-contrast imaging can produce complex nonlinear contrast, even for weakly scattering samples.

Entrapment of basic fibroblast growth factor (bFGF) in a succinylated chitosan nanoparticle delivery system and release profile.

Basic fibroblast growth factor (bFGF) helps to regulate the proliferation and migration of fibroblasts, the proliferation of endothelial cells, and aids the development of angiogenesis. Its in vivo half-life is on the order of minutes due to extensive degradation and inactivation, which could be potentially reduced by controlled release vehicles. In this study, bFGF was entrapped into chitosan (CS) and N-succinyl-chitosan (SC) nanoparticles, with and without heparin, at two levels of initial loading, followed by further characterization of the particles.

[Neurologic aspects of motion sickness].

To study the function of the nervous system in motion disease, 48 persons with low stability of the vestibular apparatus in response to accelerations induced by body rotation within two planes underwent clinico-neurologic and neurophysiological examinations. It has been established that in the second grade motion disease, there appears disseminated neurological micro-symptomatology which in 93% of the test subjects with the third degree disease becomes evident enough. It is accompanied by vegetovascular lability and transitory asthenia.