Observation of Le Sage gravity analog in complex plasma.

Fragmentation of a suspension of micron-sized plastic microparticles and their contraction into dense globules was experimentally obtained in a gas discharge plasma, when the plasma density was deliberately and abruptly increased. The globules took up spherical shapes 0.14-1.

Effect of Negative Ion Generation on Complex Plasma Structure Properties.

We propose a low-density discharge plasma model that takes into account the impact of oxygen admixture in typical conditions of complex (dusty) plasmas. Numerical simulations based on this model show that the concentration of negative ions turns out to be very high, and they play an important role in the overall kinetics in this particular range of plasma conditions. The ambipolar diffusion electric field drags these negative ions into the center of the plasma.

Long-term evolution of the three-dimensional structure of string-fluid complex plasmas in the PK-4 experiment.

Microparticle suspensions in a polarity-switched discharge plasma of the Plasmakristall-4 facility on board the International Space Station exhibit string-like order. As pointed out in [Phys. Rev.

The X-linked intellectual disability gene product and E3 ubiquitin ligase KLHL15 degrades doublecortin proteins to constrain neuronal dendritogenesis.

Proper brain development and function requires finely controlled mechanisms for protein turnover, and disruption of genes involved in proteostasis is a common cause of neurodevelopmental disorders. Kelch-like 15 (KLHL15) is a substrate adaptor for cullin3-containing E3 ubiquitin ligases, and KLHL15 gene mutations were recently described as a cause of severe X-linked intellectual disability. Here, we used a bioinformatics approach to identify a family of neuronal microtubule-associated proteins as KLHL15 substrates, which are themselves critical for early brain development.

Plasmakristall-4: New complex (dusty) plasma laboratory on board the International Space Station.

New complex-plasma facility, Plasmakristall-4 (PK-4), has been recently commissioned on board the International Space Station. In complex plasmas, the subsystem of μm-sized microparticles immersed in low-pressure weakly ionized gas-discharge plasmas becomes strongly coupled due to the high (10-10 e) electric charge on the microparticle surface. The microparticle subsystem of complex plasmas is available for the observation at the kinetic level, which makes complex plasmas appropriate for particle-resolved modeling of classical condensed matter phenomena.

Assessing particle kinematics via template matching algorithms.

Template matching algorithms represent a viable tool to locate particles in optical images. A crucial factor of the performance of these methods is the choice of the similarity measure. Recently, it was shown in [Gao and Helgeson, Opt.

Particle flows in a dc discharge in laboratory and microgravity conditions.

We describe a series of experiments on dust particles' flows in a positive column of a horizontal dc discharge operating in laboratory and microgravity conditions. The main observation is that the particle flow velocities in laboratory experiments are systematically higher than in microgravity experiments for otherwise identical discharge conditions. The paper provides an explanation for this interesting and unexpected observation.

[Stepwise treatment of a patient with seven bilateral cerebral aneurysms].

This case report describes successful multistage combined treatment of a female patent with seven bilateral cerebral aneurysms.

[Three years experience of catheter treatment of patients with acute coronary syndrome in conditions of 24-hour work of endovascular service].

In this work we have summarized 3-years experience of the treatment of acute coronary syndrome with the use of endovascular methods and presented organizational basis allowing to realize 24-hour work of the endovascular service, and algorithm of examination and treatment of patients admitted with diagnosis of acute coronary syndrome. During the analyzed period invasive interventions were carried out in 1417 patients (transluminal angioplasty - in 93, angioplasty with stenting - in 1356 patients) with mean door to balloon time 37.7 min.

Formation of a boundary-free dust cluster in a low-pressure gas-discharge plasma.

An attraction between negatively charged micron-sized plastic particles was observed in the bulk of a low-pressure gas-discharge plasma under microgravity conditions. This attraction had led to the formation of a boundary-free dust cluster, containing one big central particle with a radius of about 6 microm and about 30 1 microm-sized particles situated on a sphere with a radius of 190 microm and with the big particle in the center. The stability of this boundary-free dust cluster was possible due to its confinement by the plasma flux on the central dust particle.

Photo-fragmentation cross-section of gaseous 2,4,6-trinitrotoluene at different ultraviolet wavelengths.

The photo-fragmentation cross-section of 2,4,6-trinitrotoluene (TNT) vapor at room temperature was determined at different ultraviolet wavelengths (254, 300, 340, and 400 nm) by measuring the concentration of NO molecule with cavity ring down spectroscopy and correcting for the photo-fragmentation cross-section of NO(2). Nitric oxide (NO) molecules are produced by the TNT photo-fragmentation processes via an intermediate production of NO(2). Our results reveal that the photo-fragmentation cross-section of TNT changes appreciably with change in wavelength with xenon arc lamp illumination, increasing with decreasing excitation wavelength.

Photochemical effect in two-photon laser-induced fluorescence detection of carbon monoxide in hydrocarbon flames.

The CO formation as a result of the CO(2) photodissociation at 230.08 nm was observed by using the two-photon laser-induced fluorescence (LIF) method. The measurements were performed in a propane-air combustion product flow and in mixtures of CO(2) and O(2).

Particle charge in the bulk of gas discharges.

An experimental determination of particle charge in a bulk dc discharge plasma covering a wide range of neutral gas pressures, was recently reported [S. Ratynskaia, Phys. Rev.

Micron-sized particle-charge measurements in an inductive rf gas-discharge plasma using gravity-driven probe grains.

A method for measuring the interactions of charged dust particles within a three-dimensional dust cloud in a plasma is presented. The measurements have been performed with the help of gravity-driven heavy charged probe particles, which moved through a dust cloud levitating at the diffuse edge of an inductively coupled rf discharge plasma. Assuming a screened Coulomb potential surrounding each particle, both the particle charge and the effective screening length were calculated from an analysis of the elastic particle interactions for 20, 30, and 50 Pa of neon pressure.

Experimental determination of dust-particle charge in a discharge plasma at elevated pressures.

The charge of dust particles is determined experimentally in a bulk dc discharge plasma in the pressure range 20-100 Pa. The charge is obtained by two independent methods: one based on an analysis of the particle motion in a stable particle flow and another on an analysis of the transition of the flow to an unstable regime. Molecular-dynamics simulations of the particle charging for conditions similar to those of the experiment are also performed.

[Effects of prolonged low-intensity radiofrequency radiation in cm-range on the development of subcutaneously grafted Ehrlich's adenocarcinoma].

White mongrel male mice with subcutaneously grafted Ehrlich adenocarcinoma were exposed at week intervals to three three-day sessions of low-intensity (5 microWt/cm2) super short wave-therapy from two generators of oscillating frequency in the range of 2-18 GHz. As a result of treatment, the increase in tumour size was diminished, and the probability of its reverse development was increased, with animal lethality being decreased. During a month the recovery was increased from 0 to 50% in the first experiment and from 38.

[Radioprotective effect of low-intensity radio-frequency centimeter-band waves in lethal gamma irradiation].

Primary investigations have been carried out to determine whether low-intensity EMR of a cm range exerts the radioprotective effect. Prior to gamma-irradiation with doses LD100/30 and LD60/30 mice were exposed for 23 h to 2-8 GHz microwaves with a swing frequency of 12-14 Hz, at energy flow density of 5 +/- 1.5 mu Wt/cm2.

[Modification of lethal radiation injury in mice by postradiation exposure to low-intensity centimeter-band radio frequency waves].

A clearly pronounced modification of acute radiation injury of mice has been obtained by prolonged action (for up to 23 hours) of low-intensity (5 +/- 1.5 mu Wt/cm2) radiofrequency radiation in the ranges of 2-8, 8-18 and 19-27 GHz with a swing frequency of 12-14 Hz, applied immediately after exposure to lethal dose of gamma-radiation. Survival of mice and average life duration of killed mice were increased.