570 research outputs found
Anomalous population of He states in reactions with Li
Structure with the lowest energy observed in the He spectrum populated
in the proton knockout reaction with Li beam has a peak at
MeV. This peak is usually interpreted as a resonant ground state of
He. Our theoretical calculations indicate that this peak is likely to be
a pileup of , , and excitations with very similar shapes. %We
predict a very specific nature of the excitation in He. Moreover,
the ``soft'' excitation appears to be the lowest one in energy. Such an
anomalous continuum response is traced to the halo structure of Li
providing extreme low energy shift to all the expected continuum excitations.
Competitions of the initial state structure (ISS) and the final state
interaction (FSI) effects on the spectrum and three-body correlations in
He are discussed. Analogous effect of the extreme low-energy shift could
also be expected in other cases of emitters populated in reactions with
halo nuclei. Simplified example of the He spectrum in knockout
from Be, is given. We also discuss limits on the properties of He
stemming from the observed He spectrum.Comment: 10 pages, 13 figure
Emerg. Infect. Dis
The multidrug-resistant (MDR) Salmonella enterica serotype Newport strain that produces CMY-2 Ξ²-lactamase(Newport MDR-AmpC) was the source of sporadic cases and outbreaks in humans in France during 2000β2005. Because this strain was not detected in food animals, it was most likely introduced into France through imported food products
Spatial beam self-cleaning and supercontinuum generation with Yb-doped multimode graded-index fiber taper based on accelerating self-imaging and dissipative landscape
We experimentally demonstrate spatial beam self-cleaning and supercontinuum generation in a tapered Ytterbium-doped multimode optical fiber with parabolic core refractive index profile when 1064β
nm pulsed beams propagate from wider (122β
Β΅m) into smaller (37β
Β΅m) diameter. In the passive mode, increasing the input beam peak power above 20β
kW leads to a bell-shaped output beam profile. In the active configuration, gain from the pump laser diode permits to combine beam self-cleaning with supercontinuum generation between 520-2600β
nm. By taper cut-back, we observed that the dissipative landscape, i.e., a non-monotonic variation of the average beam power along the MMF, leads to modal transitions of self-cleaned beams along the taper length
Dependence of the Energy Spectrum of UHE Cosmic Rays on the Latitude of an Extensive Air Shower Array
Several energy spectra of cosmic rays with energies E_0 \geq 10^17 eV
measured at the Yakutsk EAS, AGASA, Haverah Park, HiRes, Auger, and SUGAR
arrays are considered. It is shown that the fairly good mutual agreement of the
spectrum shapes can be achieved if the energy of each spectrum is multiplied by
a factor K specific for each spectrum. These factors exhibit a pronounced
dependence on the latitude of the above-mentioned arrays.Comment: 4 pages, 4 figure
Three-body correlations in direct reactions: Example of Be populated in reaction
The Be continuum states were populated in the charge-exchange reaction
H(Li,Be) collecting very high statistics data ( events) on the three-body ++ correlations. The
Be excitation energy region below MeV is considered, where the
data are dominated by contributions from the and states. It is
demonstrated how the high-statistics few-body correlation data can be used to
extract detailed information on the reaction mechanism. Such a derivation is
based on the fact that highly spin-aligned states are typically populated in
the direct reactions.Comment: submitted to Physical Review
10He low-lying states structure uncovered by correlations
The 0+ ground state of the 10He nucleus produced in the 3H(8He,p)10He
reaction was found at about MeV (\Gamma ~ 2 MeV) above the
three-body 8He+n+n breakup threshold. Angular correlations observed for 10He
decay products show prominent interference patterns allowing to draw
conclusions about the structure of low-energy excited states. We interpret the
observed correlations as a coherent superposition of the broad 1- state having
a maximum at energy 4-6 MeV and the 2+ state above 6 MeV, setting both on top
of the 0+ state "tail". This anomalous level ordering indicates that the
breakdown of the N=8 shell known in 12Be thus extends also to the 10He system.Comment: 5 pages, 5 figure
On the Cauchy Problem for the Korteweg-de Vries Equation with Steplike Finite-Gap Initial Data I. Schwartz-Type Perturbations
We solve the Cauchy problem for the Korteweg-de Vries equation with initial
conditions which are steplike Schwartz-type perturbations of finite-gap
potentials under the assumption that the respective spectral bands either
coincide or are disjoint.Comment: 29 page
Cosmic Rays: The Second Knee and Beyond
We conduct a review of experimental results on Ultra-High Energy Cosmic Rays
(UHECR's) including measurements of the features of the spectrum, the
composition of the primary particle flux and the search for anisotropy in event
arrival direction. We find that while there is a general consensus on the
features in the spectrum -- the Second Knee, the Ankle, and (to a lesser
extent) the GZK Cutoff -- there is little consensus on the composition of the
primaries that accompany these features. This lack of consensus on the
composition makes interpretation of the agreed upon features problematic. There
is also little direct evidence about potential sources of UHECRs, as early
reports of arrival direction anisotropies have not been confirmed in
independent measurements.Comment: 46 pages, 30 figures. Topical Review to appear in J. Physics
Alkaloid content variability in the seeds of narrow-leafed lupine accessions from the VIR collection under the conditions of the Russian Northwest
Alkaloid content was assessed in the seeds of 59 narrow-leafed lupine (Lupinus angustifolius L.) accessions from the VIR collection in the environments of Leningrad Province. The selected set included accessions of different statuses (wild forms, landraces, and advanced cultivars) and different years of introduction to the collection. Alkaloids were analyzed using gas-liquid chromatography coupled with mass spectrometry. Concentrations of main alkaloids: lupanine, 13-hydroxylupanine, sparteine, angustifoline and isolupanine, and their total content were measured. The total alkaloid content variability identified in the seeds of the studied set of accessions was 0.0015 to 2.017 %. In most cases, the value of the character corresponded to the accessionβs status: modern improved cultivars, with the exception of green manure ones, entered the group with the range of 0.0015β0.052 %, while landraces and wild forms showed values from 0.057 to 2.17 %. It is meaningful that the second group mainly included accessions that came to the collection before the 1950s, i. e., before the times when low-alkaloid cultivars were intensively developed. Strong variability of the character across the years was observed in the accessions grown under the same soil and climate conditions in both years. In 2019, the average content of alkaloids in the sampled set was 1.9 times higher than in 2020. An analysis of weather conditions suggested that the decrease in alkaloid content occurred due to a significant increase in total rainfall in 2020. Searching for links between the content of alkaloids and the type of pod (spontaneously non-dehiscent, or cultivated, spontaneously dehiscent, or wild, and intermediate) showed a tendency towards higher (approximately twofold in both years of research) total alkaloid content in the accessions with the wild pod type and the nearest intermediate one compared to those with the pod non-dehiscent without threshing. The correlation between the average total alkaloid content and seed color, reduced to three categories (dark, or wild, light, or cultivated, and intermediate), was significantly stronger in the group with dark seeds (5.2 times in 2019, and 3.7 times in 2020). There were no significant differences in the percentage of individual alkaloids within the total amount either between the years of research or among the groups with different pod types or the groups with different seed coat colors
Research of the autocytokinins influence on the large intestineβs microflora in gastroenterological patients
ΠΠΈΠ²ΡΠ΅Π½ΠΎ Π²ΠΏΠ»ΠΈΠ² ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΡΠ² Π°ΡΡΠΎΡΠΈΡΠΎΠΊΡΠ½ΡΠ² Π½Π° Π·ΠΌΡΠ½Ρ Π±ΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΠ΅ΠΉ ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ², Π²ΠΈΠ΄ΡΠ»Π΅Π½ΠΈΡ
Π²ΡΠ΄ Ρ
Π²ΠΎΡΠΈΡ
Π½Π° Π½Π΅ΡΠΏΠ΅ΡΠΈΡΡΡΠ½ΠΈΠΉ Π²ΠΈΡΠ°Π·ΠΊΠΎΠ²ΠΈΠΉ ΠΊΠΎΠ»ΡΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ ΡΡΠΈΠΌΡΠ»ΡΠ²Π°Π»ΡΠ½Ρ Π΄ΡΡ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΡΠ² Π°ΡΡΠΎΡΠΈΡΠΎΠΊΡΠ½ΡΠ² Π½Π° ΡΡΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π½ΠΈΠΊΡΠ² Π½ΠΎΡΠΌΠ°Π»ΡΠ½ΠΎΡ ΠΌΡΠΊΡΠΎΡΠ»ΠΎΡΠΈ ΡΠΎΠ²ΡΡΠΎΡ ΠΊΠΈΡΠΊΠΈ ΡΠ° ΠΏΡΠΈΠ³Π½ΡΡΡΠ²Π°Π»ΡΠ½ΠΈΠΉ Π΅ΡΠ΅ΠΊΡ Π²ΡΠ΄Π½ΠΎΡΠ½ΠΎ ΡΠΌΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΠΈΡ
ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ². ΠβΡΡΠΎΠ²Π°Π½ΠΎ, ΡΠΎ Π°ΡΡΠΎΡΠΈΡΠΎΠΊΡΠ½ΠΈ Π½Π΅ Π²ΠΈΡΠ²Π»ΡΡΡΡ Π΄ΠΎΡΡΠΎΠ²ΡΡΠ½ΠΎΠ³ΠΎ Π²ΠΏΠ»ΠΈΠ²Ρ Π½Π° Π·ΠΌΡΠ½Ρ Π°Π½ΡΠΈΠ±ΡΠΎΡΠΈΠΊΠΎΡΡΡΠ»ΠΈΠ²ΠΎΡΡΡ ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ².Β ΠΠ·ΡΡΠ΅Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠΎΠ² Π°ΡΡΠΎΡΠΈΡΠΎΠΊΠΈΠ½ΠΈΠ² Π½Π° ΡΠΌΠ΅Π½Ρ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ², Π²ΡΠ΄Π΅Π»Π΅Π½Π½ΡΡ
ΠΎΡ Π±ΠΎΠ»ΡΠ½ΡΡ
Π½Π΅ΡΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ·Π²Π΅Π½Π½ΡΠΉ ΠΊΠΎΠ»ΠΈΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ ΡΡΠΈΠΌΡΠ»ΠΈΡΡΡΡΠ΅Π΅ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΠΏΡΠ΅ΠΏΠ°-ΡΠ°ΡΠΎΠ² Π°ΡΡΠΎΡΠΈΡΠΎΠΊΠΈΠ½ΠΈΠ² Π½Π° ΡΠΎΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²ΠΈΡΠ΅Π»Π΅ΠΉ Π½ΠΎΡΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠ»ΠΎΡΡ ΡΠΎΠ»ΡΡΠΎΠΉ ΠΊΠΈΡΠΊΠΈ ΠΈ ΠΏΠΎΠ΄Π°Π²Π»ΡΠ»ΠΈ Π½ΡΠΉ ΡΡΡΠ΅ΠΊΡ Π² ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΈ ΡΡΠ»ΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ². ΠΡΡΡΠ½Π΅Π½ΠΎ, ΡΡΠΎ Π°ΡΡΠΎΡΠΈΡΠΎΠΊΠΈΠ½Ρ Π½Π΅ ΠΏΡΠΎΡΠ²Π»ΡΡΡ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π²Π»ΠΈΡΠ½ΠΈΡ Π½Π° ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠΎΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ².The autocytokininsβ influence on the change of biological characteristics of the microorganisms secured from patients with non-specific ulcerous colitis has been studied. It has been found that autocytokinin samples have a stimulating influence on the growth of large intestineβs normal microflora and inhibiting effect to opportunistic pathogenic microorganisms. Autocytokinins are proved to have no significant influence on the antibiotic sensitivity of microorganisms
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