Single π 0 production off neutrons bound in deuteron with linearly polarized photons.

The quasifree γ → d → π 0 n ( p ) photon beam asymmetry, Σ , has been measured at photon energies, E γ , from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49 ∘ to 148 ∘ . In this kinematic region, polarization observables are sensitive to contributions from the Δ ( 1232 ) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn-Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict π 0 n photoproduction observables, based on fits to published data in the channels π 0 p , π + n and π - p .

Non-steady-state photo-EMF interferometer for detection of mechanical oscillations in transparent scattering objects.

The operation of an adaptive non-steady-state photo-electromagnetic field (EMF) sensor is studied in an interferometric arrangement including a diffuse scattering object-fiber optic plate. The mechanical oscillations of this plate induce the strains and stresses of the medium, which modulates the phase of the propagating light wave across the plate. The resonant frequencies of the mechanical system and the distribution of the phase modulation amplitude across the plate's surface are measured. The minimal detectable stress amplitude is estimated.

Search for the Θ+ pentaquark via the π(-)p→K(-)X reaction at 1.92 GeV/c.

The Θ(+) pentaquark baryon was searched for via the π(-)p→K(-)X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π(-) meson beams were incident on the liquid hydrogen target with a beam momentum of 1.92 GeV/c. No peak structure corresponding to the Θ(+) mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2° to 15° in the laboratory frame is obtained to be 0.26 µb/sr in the mass region of 1.51-1.55 GeV/c(2). The upper limit of the Θ(+) decay width is obtained to be 0.72 and 3.1 MeV for J(Θ)(P)=1/2(+) and J(Θ)(P)=1/2(-), respectively, using the effective Lagrangian approach.

[Pre-morbid borderline state in teenagers].

There was effectuated a clinical-epidemiological, follow-up research of frequency, phenomenological peculiarities and dynamics of pre-existing disease borderline disorders among teenagers-schoolers. There were defined several factors, eintraechtigening on forming stable neurotic and personal disorders.

[Military medical examination and social security of servicemen and members of their families]. / Voenno-vrachebnaia ékspertiza i sotsial'naia zashchita voennosluzhashchikh i ikh semei.

In the article the main social privileges and guarantees stipulated by the laws of Russian Federation as well as the role and significance of military medical examination organs in the problems of social security of servicemen and persons underwent military service (military training) and members of their families are discussed. The authors emphasize legal significance of conclusions drawn by military medical commissions in examined persons for registration of invalidity, insurance payments, single-payment grants, compensation and privilege rights.

[Results and prospects of activities of military medical examination units in the Armed Forces of Russian Federation]. / Itogi i perspektivy deiatel'nosti organov voenno-vrachebnoi ékspertizy v vooruzhennykh silakh Rossiiskoi Federatsii.

The role and place of military medical examination as one of the factors of national security in the system of medical support of the Armed Forces personnel is evaluated. National significance of military medical examination organs, legal and social character of medical expert conclusions which they draw is discussed. Characteristic of structure and dynamics of disease main indices causing difficulties in troop recruitment and servicemen discharge is given. Measures necessary for improvement of medical examination quality under modern conditions are mentioned.

Mutagenic specificity of the base analog 6-N-hydroxylaminopurine in the LYS2 gene of yeast Saccharomyces cerevisiae.

We used the LYS2 gene mutational system to study mutation specificity of the base analog 6-N-hydroxylaminopurine (HAP) in yeast. We characterized phenotypes of mutations using codon-specific nonsense suppressors and the test employing inactivation of the release factor Sup35 due to overexpression and formation of prion-like derivative [PSI]. We have shown that HAP induces predominantly nonsense mutations. While the tests using codon-specific nonsense-suppressors allowed to identify only about 50% of nonsense-mutations, all the nonsense-mutations were identified in the test with defective Sup35. We determined and analyzed the spectrum of HAP-induced nucleotide changes in two regions of the gene. HAP induces predominantly GC-->AT transitions in a hotspots of a central position of trinucleotide GGA or AGG. Directionality of these transitions is consistent with the idea that initial dHAPMP incorporation in the leading strand is more genetically dangerous than in lagging DNA strand. We revealed a specific context inhibitory for HAP mutagenesis, a "T" in -1 position to mutation site.

[Classification of myocardial dystrophies in aviation medical certification]. / Klassifikatsiia miokardiodistrofii v praktike vrachebno-letnoi ékspertizy.

Myocardial dystrophy is one of the most common noncoronary lesions of the myocardium in pilots. However, the abundance of proposed classifications of myocardial dystrophies poses certain problems to medical experts. The authors attempt to consider the existing classifications from the standpoint of aviation medical certification and advocate the most acceptable, to their thinking, systematics by N.P. Paleev and L.I.Levitina (1991). Examples of establishing diagnoses of myocardial dystrophy are included. The best suited program for the aviation medical certification board to work out the final statement regarding the occupational fitness of pilots with myocardial dystrophy is proposed.