137 research outputs found
Electromagnetic and Gravitational Radiation of Graviatoms
Graviatom existence conditions have been found. The graviatoms (quantum
systems around mini-black-holes) satisfying these conditions contain the
following charged particles: the electron, muon, tau lepton, wino, pion and
kaon. Electric dipole and quadrupole and gravitational radiations are
calculated for the graviatoms and compared with Hawking's mini-hole radiation.Comment: 7 pages, 1 figure, 3 tables; accepted in "Astronomical and
Astrophysical Transactions
Critical sound attenuation in a diluted Ising system
The field-theoretic description of dynamical critical effects of the
influence of disorder on acoustic anomalies near the temperature of the
second-order phase transition is considered for three-dimensional Ising-like
systems. Calculations of the sound attenuation in pure and dilute Ising-like
systems near the critical point are presented. The dynamical scaling function
for the critical attenuation coefficient is calculated. The influence of
quenched disorder on the asymptotic behaviour of the critical ultrasonic
anomalies is discussed.Comment: 12 RevTeX pages, 4 figure
Positron annihilation spectroscopy of vacancy-type defects hierarchy in submicrocrystalline nickel during annealing
Positron annihilation and X-ray diffraction analysis have been used to study submicrocrystalline nickel samples prepared by equal channel angular pressing. In the as-prepared samples the positrons are trapped at dislocation-type defects and in vacancy clusters that can include up to 5 vacancies. The study has revealed that the main positron trap centers at the annealing temperature of deltaT= 20Β°C-180Β°C are low-angle boundaries enriched by impurities. At deltaT = 180Β°C-360Β°C, the trap centers are low-angle boundaries providing the grain growth due to recrystallization in-situ
Experimental study of direct photon emission in K- --> pi- pi0 gamma decay using ISTRA+ detector
The branching ratio in the charged-pion kinetic energy region of 55 to 90 MeV
for the direct photon emission in the K- --> pi- pi0 gamma decay has been
measured using in-flight decays detected with the ISTRA+ setup operating in the
25 GeV/c negative secondary beam of the U-70 PS. The value
Br(DE)=[0.37+-0.39(stat)+-0.10(syst)]*10^(-5) obtained from the analysis of 930
completely reconstructed events is consistent with the average value of two
stopped-kaon experiments, but it differs by 2.5 standard deviations from the
average value of three in-flight-kaon experiments. The result is also compared
with recent theoretical predictions.Comment: 13 pages, 8 figure
Modelling effects of phytobiotic administration on coherent responses to Salmonella infection in laying hens
Practice of layer poultry farming and commercial egg production relies on the optimal use and improvement of the welfare and genetically determined functional abilities of laying hens, their efficient intake of feed and its components, adaptation to housing conditions and resistance to infectious diseases including salmonellosis. Previous studies were focussed on relationships of chicken performance and resistance with the expression profiles of individual genes involved in metabolic processes and immune system, or with genetic markers that can be closely associated with these processes in chickens. In this study, mathematical models of coherent changes in laying hens were developed for the expression of eight genes involved in immunity and metabolism, on the one hand, and biochemical and immunological blood parameters, on the other hand, in response to Salmonella infection and administration of a phytobiotic Intebio. The proposed modelling approach can be a further basis for an in-depth research of the relationship between the gene expression, functional state and welfare of poultry, impact of pathogenic microorganisms and use of immunomodulatory drugs
[Changing the intestinal microbiota of chickens in ontogenesis] ΠΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΌΠΈΠΊΡΠΎΠ±ΠΈΠΎΡΡ ΠΊΠΈΡΠ΅ΡΠ½ΠΈΠΊΠ° ΠΊΡΡ Π² ΠΎΠ½ΡΠΎΠ³Π΅Π½Π΅Π·Π΅
This paper presents the results of a molecular genetic analysis of the changes in the composition of the microbiota of the blind processes of the intestine of the hens of the industrial loam "Lohmann Brown" during ontogeny. According to the results of the analysis of taxonomic affiliation it is established that over 70% of the phylotypes belong to the three phylums - Firmicutes, Bacteroidetes and Proteobacteria, less represented were Actinobacteria, Tenericutes and Fusobacteria, and a significant number of unidentified bacteria was detected. During ontogenesis, birds exhibited marked changes in the ratio of the number of phylotypes and taxonomic groups of the intestinal microbiota. At the age of 20-40 weeks, the birds showed a significant increase in the representatives of the Clostridia class involved in the metabolism of carbohydrates, acid-utilizing bacteria of the order Negativicutes and bacteria with high antagonistic properties (Bifidobacteriales, Bacillus), as well as a significant decrease in the content of a number of opportunistic and pathogenic taxa - family Enterobacteriaceae, the order of Pseudomonadales, phylum Tenericutes. The greatest homogeneity of the bacterial community of the blind processes of the gastrointestinal tract in laying hens was revealed at the age of 20 weeks, which is confirmed by the estimation of biodiversity by means of ecological indices.
Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎ-Π³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΎΡΡΠ°Π²Π° ΠΌΠΈΠΊΡΠΎΠ±ΠΈΠΎΡΡ ΡΠ»Π΅ΠΏΡΡ
ΠΎΡΡΠΎΡΡΠΊΠΎΠ² ΠΊΠΈΡΠ΅ΡΠ½ΠΈΠΊΠ° ΠΊΡΡ ΠΏΡΠΎΠΌΡΡΠ»Π΅Π½Π½ΠΎΠ³ΠΎ ΠΊΡΠΎΡΡΠ° Β«ΠΠΎΠΌΠ°Π½Π½ ΠΡΠ°ΡΠ½Β» Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΎΠ½ΡΠΎΠ³Π΅Π½Π΅Π·Π°. ΠΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌ Π°Π½Π°Π»ΠΈΠ·Π° ΡΠ°ΠΊΡΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΈΠ½Π°Π΄Π»Π΅ΠΆΠ½ΠΎΡΡΠΈ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΠ²ΡΡΠ΅ 70% ΡΠΈΠ»ΠΎΡΠΈΠΏΠΎΠ² ΠΎΡΠ½ΠΎΡΠΈΡΡΡ ΠΊ ΡΡΠ΅ΠΌ ΡΠΈΠ»ΡΠΌΠ°ΠΌ - Firmicutes, Bacteroidetes ΠΈ Proteobacteria, ΠΌΠ΅Π½Π΅Π΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π±ΡΠ»ΠΈ Actinobacteria, Tenericutes ΠΈ Fusobacteria, Π° ΡΠ°ΠΊΠΆΠ΅ Π²ΡΡΠ²Π»Π΅Π½ΠΎ ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠ΅ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° Π½Π΅ΠΈΠ΄Π΅Π½ΡΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
Π±Π°ΠΊΡΠ΅ΡΠΈΠΉ. Π ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΎΠ½ΡΠΎΠ³Π΅Π½Π΅Π·Π° Ρ ΠΏΡΠΈΡ Π½Π°Π±Π»ΡΠ΄Π°Π»ΠΈΡΡ Π·Π°ΠΌΠ΅ΡΠ½ΡΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΡΠΈΠ»ΠΎΡΠΈΠΏΠΎΠ² ΠΈ ΡΠ°ΠΊΡΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Π³ΡΡΠΏΠΏ ΠΌΠΈΠΊΡΠΎΠ±ΠΈΠΎΡΡ ΠΊΠΈΡΠ΅ΡΠ½ΠΈΠΊΠ°. Π Π²ΠΎΠ·ΡΠ°ΡΡΠ΅ 20-40 Π½Π΅Π΄Π΅Π»Ρ Ρ ΠΏΡΠΈΡ ΠΎΡΠΌΠ΅ΡΠ΅Π½ΠΎ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎΠ΅ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΠΈΡΠ΅Π»Π΅ΠΉ ΠΊΠ»Π°ΡΡΠ° Clostridia, ΡΡΠ°ΡΡΠ²ΡΡΡΠΈΡ
Π² ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΠ·ΠΌΠ΅ ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΠ², ΠΊΠΈΡΠ»ΠΎΡ-ΡΡΠΈΠ»ΠΈΠ·ΠΈΡΡΡΡΠΈΡ
Π±Π°ΠΊΡΠ΅ΡΠΈΠΉ ΠΏΠΎΡΡΠ΄ΠΊΠ° Negativicutes ΠΈ Π±Π°ΠΊΡΠ΅ΡΠΈΠΉ Ρ Π²ΡΡΠΎΠΊΠΈΠΌΠΈ Π°Π½ΡΠ°Π³ΠΎΠ½ΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ (Bifidobacteriales, Bacillus), Π° ΡΠ°ΠΊΠΆΠ΅ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎΠ΅ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΡΡΠ΄Π° ΡΡΠ»ΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΠΈ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΡΠ°ΠΊΡΠΎΠ½ΠΎΠ² β ΡΠ΅ΠΌΠ΅ΠΉΡΡΠ²Π° Enterobacteriaceae, ΠΏΠΎΡΡΠ΄ΠΊΠ° Pseudomonadales, ΡΠΈΠ»ΡΠΌΠ° Tenericutes. ΠΠ°ΠΈΠ±ΠΎΠ»ΡΡΠ°Ρ ΠΎΠ΄Π½ΠΎΡΠΎΠ΄Π½ΠΎΡΡΡ Π±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠΎΠ±ΡΠ΅ΡΡΠ²Π° ΡΠ»Π΅ΠΏΡΡ
ΠΎΡΡΠΎΡΡΠΊΠΎΠ² ΠΠΠ’ Ρ Π½Π΅ΡΡΡΠ΅ΠΊ Π²ΡΡΠ²Π»Π΅Π½Π° Π² 20-Π½Π΅Π΄Π΅Π»ΡΠ½ΠΎΠΌ Π²ΠΎΠ·ΡΠ°ΡΡΠ΅, ΡΡΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π°Π΅ΡΡΡ ΠΎΡΠ΅Π½ΠΊΠΎΠΉ Π±ΠΈΠΎΡΠ°Π·Π½ΠΎΠΎΠ±ΡΠ°Π·ΠΈΡ ΠΏΡΠΈ ΠΏΠΎΠΌΠΎΡΠΈ ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΠ½Π΄Π΅ΠΊΡΠΎΠ²
Observation of the radiative kaon decay K- --> mu-pi0gammanu
Using data collected with the ISTRA+ spectrometer during the 2001 run of the
U-70 proton synchrotron in Protvino, we report the first observation of the
radiative kaon decay K- -->mu-pi0gammanu. We find Br(Kmu3g)/Br(Kmu3) for two
regions 5<Eg<30 and 30<Eg<60 MeV consistent with theoretical predictions. The
measured angular distribution asymmetry for the first region,
0.093+/-0.141, is two standard deviations away from the theoretical
prediction of 0.354. The measured asymmetry in the T-odd variable is
-0.03+/-0.13.Comment: 15 pages, 8 figurs, submitted to Yadernaya Fizik
Removing leakage-induced correlated errors in superconducting quantum error correction
Quantum computing can become scalable through error correction, but logical
error rates only decrease with system size when physical errors are
sufficiently uncorrelated. During computation, unused high energy levels of the
qubits can become excited, creating leakage states that are long-lived and
mobile. Particularly for superconducting transmon qubits, this leakage opens a
path to errors that are correlated in space and time. Here, we report a reset
protocol that returns a qubit to the ground state from all relevant higher
level states. We test its performance with the bit-flip stabilizer code, a
simplified version of the surface code for quantum error correction. We
investigate the accumulation and dynamics of leakage during error correction.
Using this protocol, we find lower rates of logical errors and an improved
scaling and stability of error suppression with increasing qubit number. This
demonstration provides a key step on the path towards scalable quantum
computing
[Mathematical assessment of BAC-based interspecies hybridization data in the process of genomic mapping in the white-throated sparrow as an avian behavioral model] ΠΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΎΡΠ΅Π½ΠΊΠ° Π΄Π°Π½Π½ΡΡ ΠΌΠ΅ΠΆΠ²ΠΈΠ΄ΠΎΠ²ΠΎΠΉ ΠΠΠ-Π³ΠΈΠ±ΡΠΈΠ΄ΠΈΠ·Π°ΡΠΈΠΈ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π³Π΅Π½ΠΎΠΌΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Ρ Π±Π΅Π»ΠΎΡΠ΅ΠΉΠ½ΠΎΠΉ Π·ΠΎΠ½ΠΎΡΡΠΈΡ ΠΈΠΈ ΠΊΠ°ΠΊ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΏΡΠΈΡ
The white-throated sparrow (Zonotrichia albicollis) known for its morphological, behavioral and chromosomal polymorphisms represents a quite new model system to study genomic mechanisms underlying variable behavioral repertoire interwoven with population biology, reproduction and adaptation in this species. It was previously shown that these polymorphisms could be due to chromosomal rearrangements (inversions) on sparrow chromosome 2 (ZAL2) that is characterized by a heterogeneity in two distinct morphs, tan (ZAL2/ZAL2) and white (ZAL2/ZAL2m). To construct a comparative genomic map of ZAL2 and other chromosomes, we used a sparrow genomic BAC library, CHORI-264. Following a cross-species overgo hybridization approach, we screened the library and developed a first-generation BAC-based comparative physical map using the chicken and zebra finch reference genomes. The map includes 640 BAC-gene assignments for 77 loci and serves for further refining the genomic regions and identifying candidate genes that are affected by rearrangements and contribute to the observed behavioral polymorphisms. Mathematical assessment of the BAC-based hybridization data was undertaken to show evolutionary relationships of avian genomes.
Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΎΡΠ΅Π½ΠΊΠ° ΠΌΠ΅ΠΆΠ²ΠΈΠ΄ΠΎΠ²ΠΎΠΉ ΠΠΠ-Π³ΠΈΠ±ΡΠΈΠ΄ΠΈΠ·Π°ΡΠΈΠΈ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π³Π΅Π½ΠΎΠΌΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Ρ Π±Π΅Π»ΠΎΡΠ΅ΠΉΠ½ΠΎΠΉ Π·ΠΎΠ½ΠΎΡΡΠΈΡ
ΠΈΠΈ β Π²ΠΈΠ΄Π° Π²ΠΎΡΠΎΠ±ΡΠ΅Π², ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΠΌΠΎΠ³ΠΎ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΡΠ΄ΠΎΠ±Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΏΡΠΈΡ
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