GEMMA experiment: three years of the search for the neutrino magnetic moment

The result of the 3-year neutrino magnetic moment measurement at the Kalinin Nuclear Power Plant with the GEMMA spectrometer is presented. Antineutrino-electron scattering is investigated. A high-purity germanium detector of 1.5 kg placed at a distance of 13.9 m from the 3 GW(th) reactor core is used in the spectrometer. The antineutrino flux is 2.7E13 1/scm/s. The differential method is used to extract (nu-e) electromagnetic scattering events. The scattered electron spectra taken in 5184+6798 and 1853+1021 hours for the reactor ON and OFF periods are compared. The upper limit for the neutrino magnetic moment < 3.2E-11 Bohr magneton at 90% CL is derived from the data processing.Comment: 4 pages, 4 figure

Testing T Invariance in the Interaction of Slow Neutrons with Aligned Nuclei

The study of five-fold (P even, T odd) correlation in the interaction of slow polarized neutrons with aligned nuclei is a possible way of testing the time reversal invariance due to the expected enhancement of T violating effects in compound resonances. Possible nuclear targets are discussed which can be aligned both dynamically as well as by the "brute force" method at low temperature. A statistical estimation is performed of the five-fold correlation for low lying p wave compound resonances of the $^{121}$Sb, $^{123}$Sb and $^{127}$I nuclei. It is shown that a significant improvement can be achieved for the bound on the intensity of the fundamental parity conserving time violating (PCTV) interaction.Comment: 22 pages, 5 figures, published versio

Sensitivities of Low Energy Reactor Neutrino Experiments

The low energy part of the reactor neutrino spectra has not been experimentally measured. Its uncertainties limit the sensitivities in certain reactor neutrino experiments. The origin of these uncertainties are discussed, and the effects on measurements of neutrino interactions with electrons and nuclei are studied. Comparisons are made with existing results. In particular, the discrepancies between previous measurements with Standard Model expectations can be explained by an under-estimation of the low energy reactor neutrino spectra. To optimize the experimental sensitivities, measurements for \nuebar-e cross-sections should focus on events with large ($>$1.5 MeV) recoil energy while those for neutrino magnetic moment searches should be based on events $<$100 keV. The merits and attainable accuracies for neutrino-electron scattering experiments using artificial neutrino sources are discussed.Comment: 25 pages, 9 figure

Testing neutrino magnetic moment in ionization of atoms by neutrino impact

The atomic ionization processes induced by scattering of neutrinos play key roles in the experimental searches for a neutrino magnetic moment. Current experiments with reactor (anti)neutrinos employ germanium detectors having energy threshold comparable to typical binding energies of atomic electrons, which fact must be taken into account in the interpretation of the data. Our theoretical analysis shows that the so-called stepping approximation to the neutrino-impact ionization is well applicable for the lowest bound Coulomb states, and it becomes exact in the semiclassical limit. Numerical evidence is presented using the Thomas-Fermi model for the germanium atom.Comment: 5 pages, 1 figur

Cosmic muon flux at shallow depths underground

We consider the cosmic muon background for the installations located at shallow depths. We suggest a relatively simple formula for the sea-level muon spectrum, which allows calculate dependencies of the vertical muon intensity and integral muon flux density on overburden. Muon flux dependency on the zenith angle at overburden of 10 to 100 meters of standard rock shows that muon angular distribution practically does not change in this interval. We present muon angular distributions for three typical apparatus locations in measurements on the surface and at shallow depths. It is shown that for such installations the active shielding "umbrella" should overlap a zenith angle of \theta ~ 80^o to remove the cosmic muon background.Comment: 9 pages, 6 figures, submitted to Phys.Atom.Nuc

Probiotic periodontal complex: research of efficiency

The article present the result of the use probiotic complex «ASEPTA PARODONTAL®» containing Lactobacillus plantarum and Lactobacillus brevis. After a month of using the drug, a decrease in the inflammation index by 34.83%, a decrease in the bleeding index by 63.47%, and a decrease in the level of halitosis by 66.23% were revealed. In the biochemical parameters of saliva, a decrease in the level of saliva protein by 70.28%, a decrease in the integral indicator of the total antioxidant activity by 29.57% was revealed.В статье рассмотрена эффективность применения пробиотического комплекса «АСЕПТА PARODONTAL®», содержащего штаммы Lactobacillus plantarum и Lactobacillus brevis. Через месяц использования препарата выявлено снижение индекса воспаления на 34,83%, снижение индекса кровоточивости на 63,47%, снижение уровня галитоза на 66,23%. В биохимических показателях слюны выявлено снижение уровня белка слюны на 70,28%, снижение интегрального показателя общей антиоксидантной активности на 29,57%

A New Upper Limit for the Tau-Neutrino Magnetic Moment

Using a prompt neutrino beam in which a nu_tau component was identified for the first time, the nu_tau magnetic moment was measured based on a search for an anomalous increase in the number of neutrino-electron interactions. One such event was observed when 2.3 were expected from background processes, giving an upper 90% confidence limit of 3.9x10^-7 Bohr magnetons.Comment: 9 pages; 1 figur

Calcium-creatinine ratio and the Sulkowitch test with multiple caries in children with multiple caries

The article discusses the relationship of calcium excretion and caries in children 5-9 years of age. A tendency to increase in the calcium-creatinine ratio (0.28±0.09 mmol / mmol in the group with multiple caries; 0.20±0.01 mmol / mmol in the control group at р≥0.05) and the Sulkowitch test (0,90 points in the group with multiple caries; 0.44 points in the control group with p≥0.05). The correlation between the intensity of caries and laboratory parameters was found for groups of children with multiple caries. To increase the evidence of the relationship of calcium excretion rates and caries intensity, it is necessary to accumulate a larger amount of clinical material.В статье рассмотрена взаимосвязь показателей экскреции кальция и наличия кариеса у детей 5-9 лет. Выявлена тенденция повышения показателей кальций-креатининового соотношения (0,28±0,09 ммоль/ммоль в группе с множественным кариесом; 0,20±0,01 ммоль/ммоль в контрольной группе при р≥0,05) и пробы Сулковича (0,90 балла в группе с множественным кариесом; 0,44 балла в контрольной группе при р≥0,05). Корреляционная связь между интенсивностью кариеса и лабораторными показателями выявлена для группы детей с декомпенсированной формой кариеса. Для повышения доказательности взаимосвязи показателей экскреции кальция и интенсивности кариеса необходимо накопление большего объема клинического материала

The level of CD147 expression correlates with cyclophilin-induced signalling and chemotaxis

<p>Abstract</p> <p>Background</p> <p>Previous studies identified CD147 as the chemotactic receptor on inflammatory leukocytes for extracellular cyclophilins (eCyp). However, CD147 is not known to associate with signal transducing molecules, so other transmembrane proteins, such as proteoglycans, integrins, and CD98, were suggested as receptor or co-receptor for eCyp. CD147 is ubiquitously expressed on many cell types, but relationship between the level of CD147 expression and cellular responses to eCyp has never been analyzed. Given the role of eCyp in pathogenesis of many diseases, it is important to know whether cellular responses to eCyp are regulated at the level of CD147 expression.</p> <p>Results</p> <p>Here, we manipulated CD147 expression levels on HeLa cells using RNAi and investigated the signalling and chemotactic responses to eCypA. Both Erk activation and chemotaxis correlated with the level of CD147 expression, with cells exhibiting low level expression being practically unresponsive to eCypA.</p> <p>Conclusions</p> <p>Our results provide the first demonstration of a chemotactic response of HeLa cells to eCypA, establish a correlation between the level of CD147 expression and the magnitude of cellular responses to eCypA, and indicate that CD147 may be a limiting factor in the receptor complex determining cyclophilin-induced Erk activation and cell migration.</p