Universal Regimes in Long-Time Asymptotic of Multilevel Quantum System Under Time-Dependent Perturbation.

In the framework of an exactly soluble model, one considers a typical problem of the interaction between radiation and matter: the dynamics of population in a multilevel quantum system subject to a time dependent perturbation. The algebraic structure of the model is taken richly enough, such that there exists a strong argument in favor of the fact that the behavior of the system in the asymptotic of long time has a universal character, which is system-independent and governed by the functional property of the time dependence exclusively. Functional properties of the excitation time dependence, resulting in the regimes of resonant excitation, random walks, and dynamic localization, are identified.

Sloppy, But Acceptable, Control of Biological Movement: Algorithm-Based Stabilization of Subspaces in Abundant Spaces.

In this paper, we develop an algorithm-based approach to the problem of stability of salient performance variables during motor actions. This problem is reformulated as stabilizing subspaces within high-dimensional spaces of elemental variables. Our main idea is that the central nervous system does not solve such problems precisely, but uses simple rules that achieve success with sufficiently high probability.

Unintentional force changes in cyclical tasks performed by an abundant system: Empirical observations and a dynamical model.

The study explored unintentional force changes elicited by removing visual feedback during cyclical, two-finger isometric force production tasks. Subjects performed two types of tasks at 1Hz, paced by an auditory metronome. One - Force task - required cyclical changes in total force while maintaining the sharing, defined as relative contribution of a finger to total force.

Random scattering by atomic density fluctuations in optical lattices.

We investigate hitherto unexplored regimes of probe scattering by atoms trapped in optical lattices: weak scattering by effectively random atomic density distributions and multiple scattering by arbitrary atomic distributions. Both regimes are predicted to exhibit a universal semicircular scattering line shape for large density fluctuations, which depend on temperature and quantum statistics.

[Factors, determining the activity of a new antimicrobial substance from fish oils from various species].

The induction of antimicrobial activity of a new preparation, an aqueous fraction of water-oil emulsion oxidized by air oxygen, was studied. The effect of various factors (the degree of unsaturation of the initial oil and the content of oil oxidation products in obtained preparation) on the antimicrobial activity was determined. The antimicrobial activity of the preparation was induced by oil oxidation.

Bose-Einstein condensates with 1/r interatomic attraction: electromagnetically induced "gravity".

We show that particular configurations of intense off-resonant laser beams can give rise to an attractive 1/r interatomic potential between atoms located well within the laser wavelength. Such a "gravitational-like" interaction is shown to give stable Bose-Einstein condensates that are self-bound (without an additional trap) with unique scaling properties and measurably distinct signatures.

[(2E)-4-hydroxy-2-nonenal--an active component of a new natural antimicrobial substance].

A mixture of water-soluble oxidation products of Sardinops melanosticta sardine oil was found to contain (2E)-4-hydroxy-2-nonenal. This was isolated by column chromatography on silica gel and reversed-phase HPLC. Its structure was elucidated by physicochemical methods.

Localized decay of excited atoms in cavities.

Spontaneous decay of excited cold atoms into cavity can drastically affect their translational dynamics, namely, atomic reflection, transmission or localization in the cavity.

[Various lipases for producing products enriched with polyenic acids in fish fat hydrolysis].

The enzymic hydrolysis of fish with lipases from various sources was studied. The lipase from the fungus Rhizopus microsporus preferentially removes saturated fatty acids, while lipase from the pyloric caeca of salmon unsaturated fatty acids upon hydrolysis of fish fats. The enzymes can be used to obtain fatty products enriched with eicosanopentaenoic acid, mono- and diacylglycerols by enzymic hydrolysis of the ivasi fat.

[Diet containing fish oil as protection against ethanol-induced lesions of the gastric mucosa in rats].

Effect of dietary fish oil obtained from Sardinops Sagax malanosticta on ethanol-induced gastric mucosal lesions was studied in female Wistar rats with initial weight of 90-100 g. During three weeks, the untreated control group was fed with the basic diet containing 6% butter as a lipid component, while two test groups received olive oil or fish oil 0.2 ml/rat/day) in addition to the basic diet.