low-frequency dispersion of surface conducting particles as measured by means of electrorotation

Electrorotation of glutaraldehyde-fixed red blood cells (RBCs) has been investigated in the frequency range from 16 Hz to 30 MHz. Special emphasis has been given to the low-frequency range (16 Hz–2 kHz). In this region, a distinctly new type of co-field rotation peak was observed. Native RBCs also show low-frequency rotation, but much less pronounced. The low-frequency rotation is nonmonotonous with regard to conductivity. With increasing external conductivity, the low-frequency rotation speed reaches a maximum of around 3.5 mS/m and decreases again when the external conductivity is increased further. The low-frequency co-field rotation peak was observed between 30 Hz and 70 Hz except at very low conductivity almost independent of electrolyte concentration. Decreasing surface charge density by means of neuraminidase led to a reduction of the rotation speed in the low-frequency range. The position of the peak remained unaffected by changes of the surface charge density. These experimental results are not consistent with the typical Pauli–Schwan- and Maxwell–Wagner-dispersion. They rather suggest the presence of a concentration polarization mechanism responsible for the low-frequency electrorotation peak.     

Invariant cubature formulas for the hyperoctahedron

Cubature formulas for calculating integrals over the hyperoctahedron that are invariant under the group of all of its orthogonal transformations are obtained. Two of them are exact for all polynomials of degree no greater than seven and one is exact for all polynomials of degree no greater than five. Translated fromMatematicheskie Zametki, Vol. 61, No. 5, pp. 734–741, May, 1997. Translated by V. N. Dubrovsky     

Measurement of the charge asymmetry of the Dalitz plot parameters for K ± → π ± π 0 π 0 decays

The results are presented for the charge asymmetry of the Dalitz plot parameters g, h, and k measured for K ^± → π ^± π ⁰ π ⁰ decays. The experiment has been carried out in the 35-GeV/c kaon beams at the IHEP accelerator. The g, h, and k parameters appear to be identical for K ⁺ and K ^? decays within the experimental uncertainty. In particular, a value of (0.2 ± 1.9) × 10^?3 is obtained for the charge asymmetry A _g = (g ⁺ ? g ^?)/(g ⁺ + g ^?) of the Dalitz plot slope.     

Chemical composition and antibacterial activity of selected essential oils and some of their main compounds

The chemical composition of essential oils of cabreuva (Myrocarpus fastigiatus Allemao, Fabaceae) from Brazil, cedarwood (Juniperus ashei, Cupressaceae) from Texas, Juniper berries (Juniperus communis L., Cupressaceae) and myrrh (Commiphora myrrha (Nees) Engl., Burseraceae) were analyzed using GC/FID and GC/MS. The antimicrobial activity of these essential oils and some of their main compounds were tested against eleven different strains of Gram-positive and Gram-negative bacteria by using agar diffusion and agar serial dilution methods. Animal and plant pathogens, food poisoning and spoilage bacteria were selected. The volatile oils exhibited considerable inhibitory effects against all tested organisms, except Pseudomonas, using both test methods. Higher activity was observed against Gram-positive strains in comparison with Gram-negative bacteria. Cabreuva oil from Brazil showed similar results, but in comparison with the other oils tested, only when higher concentrations of oil were used.     

Lithium versus Mono/Polyvalent Ion Intercalation: Hybrid Metal Ion Systems for Energy Storage

The energy storage by redox intercalation reactions is, nowadays, the most effective rechargeable ion battery. When lithium is used as intercalating agents, the high energy density is achieved at an expense of non‐sustainability. The replacement of Li⁺ with cheaper monovalent ions enables to make greener battery alternatives. The utilization of polyvalent ions instead of Li⁺ permits to multiplying the battery capacity. Contrary to Li⁺, the realization of quick and reversible intercalation of bigger monovalent and of polyvalent ions is a scientific challenge due to kinetic constraints, polarizing ion effects and Coulomb interactions. Herein we provide a vision how to make the intercalation of these ions feasible. The idea is to perform dual intercalation of ions having different charges, radii, preferred coordination and diffusion pathway topology. All these features are demonstrated by the recent knowledge on selective and non‐selective intercalation properties of oxides and polyanion compounds with layered and tunnel structures. Based on dual intercalation properties, the fabrication of hybrid metal ion batteries is presented and discussed.     

Compton-effect on π−-meson

The reaction π^? A→Aπ^? γ at 40 GeV/c was studied on “Sigma” spectrometer on six different nuclear targets in the region of four-momentum transfer |t|<0.05 (GeV/c)². A phenomenon of elastic scattering of pions on the nuclear Coulomb field photons was observed, its total and differential cross sections were measured. The cross section of Compton effect on π^?-meson was measured.     

The A-dependence of J/ψ-particle inclusive distributions

The differential cross sections $\text{d}\text{σ}\text{d}\text{x}$ and $\text{d}\text{σ}\text{d}\text{p}{}_{\mathrm{t}}{}^2$ of inclusive J/ψ production by 43 GeV/c π^? off Be, Cu and W nuclei have been measured. Fitting $\text{d}\text{σ}\text{d}\text{p}{}_{\mathrm{t}}{}^2\text{～ A}{}^{\mathrm{\alpha }}\text{(p}{}_{\mathrm{t}}{}^2\text{)}$ we observed the increase of α with p_t².     

Photopolymers — Holographic investigations,mechanism of recording and applications

The holographic characteristics of a broad class of photopolymerization systems of the acryl type — metal (Ba, Pb, Ca, Sr) acrylates and acrylamide — are investigated. The conditions — composition, recording light intensity and spatial frequency — for self-fixing real-time recording are defined. Holographic techniques are employed to determine some basic characteristics of the photopolymerization reactions — order of the photochemical reaction and diffusion coefficients of the monomers used. Experiments are carried out proving the suitability of the investigated photopolymerization systems for optical correlation processing.     

Mapping of Malus domestica allergens by 2-D electrophoresis and IgE-reactivity

The importance of apple allergens has been repeatedly emphasized, and their presence has been confirmed both in pollen and in fruits. In the present study, a combination of proteomic tools have been used to build a complete allergen map of apple. The water-soluble fraction of an apple extract was precipitated using a phenol-based procedure and separated by 2-DE. Initially four previously classified allergens, Mal d 1, Mal d 2, Mal d 3 and Mal d 4, could be identified in Western blots with polyclonal rabbit antibodies directed to the four respective allergens, and subsequently matched to the bands recognized by several patient sera. Further, all four known apple allergens were localized on a 2-DE map and they were matched with spots recognized by sera of patients with different allergic patterns. Moreover, a new, putative allergen could be identified using MS. We evaluated the influence of post-translational modifications and the immunoreactivity under different analytical conditions. The comparison of different visualization methods for 2-DE gels and blots revealed that even very low concentrations of the intact epitopes are detectable by IgEs of patients, and therefore might be sufficient to trigger allergic symptoms in sensitized individuals.