Stable colloidal solution of gold in hexane was obtained by interphase reduction of gold complex with quaternary ammonium salt with sodium borohydride dissolved in hexane and water, respectively, without any addition of a stabiliser. The disperse phase of the colloidal solution consists of crystal spherical particles of gold of average diameter ca. 2.6 nm (sigma = 0.47). Simultaneously with formation of hexane colloidal dispersion, the gold film was deposited at the walls of the reaction vessel in aqueous phase. This film is composed of spherical gold particles of average diameter 8.2 nm (sigma = 0.57).
The paper presents data on the pollen fertility recovery rate and heterosis manifestation as indicated by productivity elements in the F-1 hybrids produced by crossing a sterile line with Ae, kotschyi cytoplasm and winter wheat varieties. No complete recovery of pollen fertility in the F-1 hybrids was revealed in spite of availability of two Rfv genes in the tested varieties. In singular cases heterosis was manifested in 1000-grain weight, spike Length and the number of spikelets per ear.
The process of interaction of excited atoms or ions, located in varying external magnetic field was analysed on the basis of a hydrogen atom model. In medium-range magnetic fields in which paramagnetic interaction is commensurable with diamagnetic, the behavior of an atom was modelled by three-dimensional harmonic oscillator. An investigation of the dependence of the value and the magnetic susceptibility sign of an atom on the principal coordinate quantum number; of the oscillator has shown that when the value and combination of these quantum numbers are changed, magnetic properties of the oscillator can be changed from diamagnetic to paramagnetic and vice versa. Such dependence of magnetic properties of the atom on the degree of its excitation may be applied in particular, for magnetic recording of information in optical excitation of a medium.
Theoretical findings supporting semiconducting properties of the ReSi1.75 phase were originally obtained by ab initio Linear muffin-tin orbital method. The material was shown to be a narrow-gap semiconductor with indirect transition value of 0.16 eV. The first direct transition with appreciable oscillator strength at 0.30 eV is predicted.
Regulariting of inheriting major components of productivity and early ripeness were studied in intraspecific hybrids F-1 of greenhouse tomatoes produced involving the lines carrying recessive markers, and their influence on induction of heterosis effect was estimated. The results of conducted genetic analysis show good prospects of applying multimarker lines Mo 500 and Mo 628 containing recessive mutant genes in a homozygous state for heterosis breeding of greenhouse tomatoes.
The transition SL(2. C) --> SLq(2. C) is considered in the framework of the Fedorov's vector parametrization. The quantum analogue of the linearity relations is introduced and used. As a result, two sets of q-deformed Pauli matrices are obtained, to be used for describing the quantum matrices L-q and L-q(-1), respectively.
We show that the profile problem for trees is equivalent to the problem of finding a minimal caterpillar labeling of edges of trees. This problem is to assign to each edge a positive integer such that: 1) the subset of edges with labels 1 spans a caterpillar with a diametral path which connects two leaves; 2) if we delete all edges with labels at most i then in each subtree the subset of edges with labels i+1 spans a caterpillar with a diametral path which connects two leaves of this subtree; 3) the sum of labels of all edges is minimal.
An algebra is called finitary if it consists of finite-rank transformations of a vector space. Finitary simple Lie algebras over the field of zero characteristic are classified.
A hereditary class P is called finitely generated if the set of all minimal forbidden induced subgraphs for P is finite. For a pair of hereditary classes P and Q, we define a hereditary class P * Q of ail graphs G which have a partition A boolean OR B = VG such that G(A) epsilon P and G(B) epsilon P. (The subgraph of G induced by X subset of or equal to VG is denoted by G(X).) We investigate the problem of recognizing finitely generated classes of the form P * Q.
It is described in the paper a board reducer design, which allows to receive a number of advantages in comparison with the classical schemes for bus driving axles. The original scheme of a driving gear arrangement allows to cancel bulky bearing unit, that simplifies considerably and makes cheaper the design in manufacturing and in of bus operating. However there is an additional restriction on assembling for this reducer, which in aggregate with restrictions on overall dimensions and dynamic loading of a gear give an interconnected set of its parameters, which is satisfying to the requirements of durability and noise.
Effect of aldo-, keto-, deoxy- and disugars, polysaccharides and acids of Crebs cycle on xylose/glucose isomerase production by Arthrobacter species B-5 was investigated. The bacteria were found to show high growth rate and rare for microorganisms inherent capacity to synthesize enzyme in absence of specific substrate. The obtained results enable to regard Arthrobacter sp. B-5 as a potential xylose/glucose isomerase source and model organism for investigation of constitutive enzyme synthesis in procariotes.
The character of destruction of glued glass-plastic prestressed constructions has been determined in the course of the investigation. Interface durability criteria have been obtained based on experimental data.
Immobilization of nine different proteins on formylated polystyrene beads of 1/4 inch (0.63 cm) in diameter (FPSB), intended for use as solid-phase support in immunoassay. was studied. The density of immobilized protein (DIP) was examined as a function of initial protein concentration, content of reactive groups on the matrix, reaction time and temperature. pH of solution and low molecular weight ions were found to have a pronounced effect on DIP. The highest values of DIP (up to 104 mu g/cm(2)) were obtained in 0.1 M phosphate buffer, pH = pI, and in 0.1 M phosphate buffer containing 1 M NaCl, pH 3-4. The value of DIP was shown to decrease with increase of protein molecular weight.
Aggregation and morphological-structural modifications in human platelets exposed to low-frequency ultrasound (US) were investigated. The US Frequency was 22 kHz and intensity was 0,4-16 W/cm(2). It was shown that US induced platelet aggregation. The maximal late of aggregation was reached at US-intensity of 1,9 W/cm(2). If the US-intensity was higher than 5 W/cm(2), not only platelet aggregation but their destruction, decreased concentration, volume and size resulted. According to electronic microscopy data US (16 W/cm(2), 15 s) caused the formation of spherical vesicles of under-platelet size.
Let Gamma be a finitely generated group. It is proved that if the variety of characters of irreducible representations of Gamma into SL2(K) has the dimension greater than or equal to 2 then Gamma is a non-trivial free product with amalgamation. As a corollary we conclude that one relator two generator groups with torsion are non-trivial free products with amalgamation.
We solve the integral equations with variable limits of integration. The kernels of equations depend on difference and sum of arguments.
We consider one-dimensional stochastic differential equation of the form dY(t) = B(t, X-t)dW(t), t greater than or equal to 0, with the Borel measurable function B: \0, infinity) x R --> R and one-dimensional Wiener process W. Existence of (weak) solutions is proven by the assumptions of local integrability of sup(t greater than or equal to 0)B(-2)(t, x) and continuity of B-2(t, x) in the time variable. This generalizes the well-known results of Engelbert and Schmidt for the homogene case and guarantees unlike the cited papers, existense of global solutions.
Single machine scheduling for n jobs with nested release and due date intervals is considered. Necessary and sufficient conditions for the existence of a due date feasible schedule are obtained which may be verified in O(n) time. An O(n log n) algorithm for minimizing the weighted number of late jobs with given deadlines for the subset of jobs and oppositely ordered weights and processing times is proposed.
The model which allowed to consider the ultrasonic oscillations (USO) influence on the process of metal superplastic (SP) deformation was elaborated. The increasing diffusion of vacancies under USO impact was taken into account. It was shown that ultrasonic oscillations decrease both SP deformation stress and grain boundary dislocations density.
In experiments on conscious rats, it was found that at 7 days after injection of toxic doses of kainic acid to the comissural nucleus of tractus solitarii (NTS) there was a sustained hyperalgesia, accompanied by a sharp decrease of serotonin content in the rostrodorsomedial medulla. The increased utilization of serotonin was indicated by a two-fold rise in the level of its major metabolite 5-hydroxyindolacetic acid in the NTS area.
