Ionizing radiation is widely applied in food production as preservation technology and for correction of the gut microbiome of cancer patients, rescuers, astronauts etc. Lactic acid bacteria (LAB) ...can be used for the same reason. The main goal of this study was to investigate the effect of irradiation on some activities of Lactobacillus rhamnosus MDC 9661 and its effect on the survival of irradiated rats. The results indicate that both ultraviolet (during 45 min) and X‐ray irradiations (with 2 Sv) decreased the CFU and the antibacterial activity of the strain. Higher than 700 Sv dose of X‐ray irradiation resulted in the total inhibition of antibacterial activity with the total reduction of colony forming units less than 10 cells ml−1, while irradiated with 1000 Sv dose L. rhamnosus MDC 9661 did not lose its proteolytic activity. It was also shown that L. rhamnosus MDC 9661 was not immunogenic in the organism of the rats and cannot lead to the development of autoimmune responses. L. rhamnosus MDC 9661 demonstrated the necessary properties for probiotics and can be effectively used for the correction of the gut microbiome of all target groups. The co‐aggregation of the cells is one of the mechanisms for resistance of LAB to irradiation.
Significance and Impact of the Study: Ionizing radiation is widely applied for food preservation and for correction of the gut microbiome of patients treated with radiation, rescuers, astronauts, etc. Some lactic acid bacteria (LAB) are of great potential in restoring the microbiome of patients, or in food bio‐preservation. This investigation revealed the radioresistance of Lactobacillus rhamnosus MDC 9661 with only some loss of antibacterial activity, maintaining other activities and the absence of an immunogenic effect. So, it is a potential probiotic organism for the treatment of target people groups. The results showed that co‐aggregation is one of the LAB resistance mechanisms which can be used in future to select effective strains.
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Deeply Virtual Compton Scattering (DVCS) is a key reaction to gain information on Generalized Parton Distributions. In this paper the existing measurements of DVCS on the nucleon, as well as those ...planned for the near future, are presented and discussed.
A
bstract
A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized ...protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing cos (
ϕ−ϕ
S
) modulations provide evidence for a sizable worm-gear (II) distribution,
g
1
T
q
x
p
T
2
. Most of the other modulations are found to be consistent with zero with the notable exception of large sin (
ϕ
S
) modulations for charged pions and
K
+
.
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The ...dependence of the cross section on the azimuthal angles of the target polarization (ϕS) and the produced hadron (ϕ) is found to have a substantial sin(ϕ+ϕS) modulation for the production of π+, π− and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For π0 and K− production the amplitude of this Fourier component is consistent with zero.
A measurement of beam-helicity asymmetries for single-hadron production in deep-inelastic scattering is presented. Data from the scattering of 27.6 GeV electrons and positrons off gaseous hydrogen ...and deuterium targets were collected by the HERMES experiment. The asymmetries are presented separately as a function of the Bjorken scaling variable, the hadron transverse momentum, and the fractional energy for charged pions and kaons as well as for protons and anti-protons. These asymmetries are also presented as a function of the three aforementioned kinematic variables simultaneously.
X-Ray Monochromators: I. Theory Mesropyan, M.H.; Rostomyan, A.H.
Physica status solidi. B. Basic research,
June 2002, Letnik:
231, Številka:
2
Journal Article
Recenzirano
X‐ray cyclic monochromators, which are particular cases of X‐ray resonators, are considered. Conditions for the existence of a resonance wavelength in the Co‐Kα1 line spectral interval in monolithic ...cyclic monochromators and polylithic tunable cyclic monochromators are discussed. Maximum reflectivity for a four‐reflection monolithic monochromator is achieved when each reflection is symmetric. For a two‐monolith four‐reflection polylithic monochromator, maximum reflectivity is achieved when the asymmetry of one reflection in one monolith is the inverse of the other reflection in the same monolith.
We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the positron in the final state, exploring the highly virtual photon region. The ...search is performed in e^{+}e^{-}→e^{+}e^{-}J/ψπ^{+}π^{-}, using 825 fb^{-1} of data collected by the Belle detector operated at the KEKB e^{+}e^{-} collider. We observe three X(3872) candidates, where the expected background is 0.11±0.10 events, with a significance of 3.2σ. We obtain an estimated value for Γover ˜_{γγ}B(X(3872)→J/ψπ^{+}π^{-}) assuming the Q^{2} dependence predicted by a ccover ¯ meson model, where -Q^{2} is the invariant mass squared of the virtual photon. No X(3915)→J/ψπ^{+}π^{-} candidates are found.
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