207 research outputs found
formozov/larva_tracking_Imambocus_et_al: A two-choice assay for noxious light avoidance with temporal distribution analysis in Drosophila melanogaster larvae. STAR Protocols.
No full textTwo-choice assays allow assessing different behaviors including light avoidance in Drosophila larvae. Typically, the readout is limited to a preference index at a specific end point. We provide a detailed protocol to set up light avoidance assays and map the temporal distribution of larvae based on analysis of larval intensities (Imambocus et al., 2022). We describe the assay setup and implementation of scripts for analysis,
which can be easily adapted to other two choice assays and different model organisms. For details see the artcle in STAR Protocols
Les rongeurs vivant en colonies dans la steppe eurasienne et leur influence sur les sols et la vegetation
No full textFormozov A. N., Kodachova K. S., Frechkop Serge. Les rongeurs vivant en colonies dans la steppe eurasienne et leur influence sur les sols et la vegetation. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 15, n°1, 1961. pp. 116-129
Fused Fiber Photometry
No full textThe code allows reproduction of the analysis of data presented in the manuscript "A flexible and versatile system for multi-color fiber photometry and optogenetic manipulation", Cell Method Reports, 2023, by Formozov, Dieter, and Wiegert.
It is suitable for a general analysis of fiber photometry together with other behaviorally relevant parameters. </p
SEARCH FOR NON-STANDARD NEUTRINO INTERACTIONS WITH LARGE-VOLUME LIQUID SCINTILLATOR DETECTORS
No full textEven though electroweak part of the Standard Model passed decades of testing and precision measurements, there is still a space for the presence of new physics. In particular, the neutrino sector in the last years has been reaching the level of precision oscillometry. However, the current data are not able to exclude many possible extended scenarios, in which new interactions comparable with the standard ones are still possible. This work is dedicated to beyond-Standard-Model interactions of neutrino and electron called Non-Standard Interactions or shortly NSI. Analogously to standard electroweak interactions, NSI could be charged current (CC) and neutral current (NC) type. Usually, in analyses of experiments, NC and CC NSI are considered separately, and I follow this strategy in the course of this work. The global search for NSI involves almost all experimental approaches of neutrino physics and goes far beyond the scope of this work. Here, instead, I look at the problem through the prism of the large-scale liquid scintillator experiments and confine the investigation to the search for NC NSI with solar neutrinos. In addition, I review CC NSI with reactor neutrinos at medium baseline.
As a contribution into upcoming JUNO experiment, I investigate liquid scintillator energy response and radiopurity, which are essential for the successful realization of solar and reactor neutrino physics programs and, therefore, for NC and CC NSI search. I analyze in detail the non-linearity and energy resolution of liquid scintillator. I develop an experimental Compton coincidence technique with High Pure Germanium gamma spectrometer, provide a conservative measurement of the Birks’ ionization quenching constant kB and discuss problems related to its measurement. Throughout the study, I also formulate the optimal characteristics of the experimental apparatus for this improvement. The ultimate goal of this investigation is separating intrinsic energy resolution, which was never yet robustly measured for liquid organic scintillators. The intrinsic energy resolution may have an impact on the energy response of the new generation large liquid scintillator detectors such as JUNO and have to be carefully investigated. Applying single photon counting technique, I perform a calibration of the PMT charge scale and set apart statistical term from the total liquid scintillator energy resolution. Remaining term significantly differs from zero, indicating the presence of additional contribution associated with the intrinsic energy resolution. As an outlook, the precise estimation of the light collection should be conducted in order to ensure that its contribution is not significant to mimic the observed intrinsic resolution effect. The analysis of the radiopurity of the liquid scintillator showed that it is close to the one demanded for reactor neutrino program and CC-NSI search. Still, an improvement of purification procedure is necessary to fulfill solar neutrino program requirements for NC NSI search. Finally, I place the limits to NC NSI parameters for electron and tau neutrino with the Phase II data of Borexino experiment. The limits are quite stringent and compatible with other experiments. The best up-to-date limit to the left electron NSI-parameter is obtained. The allowed regions could be further significantly reduced by incorporating the current result in a global analysis. Besides, the same analysis approach is used to measure the squared sine of the Weinberg angle with a precision comparable with reactor neutrino experiments and place the most robust limit on the probability of ν−ν̄ conversion in the Sun for solar neutrinos with energies Eν < 1.8 MeV. I conclude with deliberation on the applicability of solar neutrino NC NSI approach for current JUNO detector configuration
Fig. 7 in Intraspecific variation and taxonomy of northern pika Ochotona hyperborea (Mammalia, Lagomorpha)
No full textFig. 7.—Spatial distribution of acoustic races of Ochotona hyperborea. Cases taken from the literature (Formozov 1991; Formozov and Emelyanova 1999) are outlined by the outer circle. The schematic spatial distribution of genetic lineages is outlined by the dashed line.Published as part of Lissovsky, Andrey A., Obolenskaya, Ekaterina V., Dokuchaev, Nikolai E. & Okhlopkov, Innokentiy M., 2021, Intraspecific variation and taxonomy of northern pika Ochotona hyperborea (Mammalia, Lagomorpha), pp. 28-53 in Journal of Mammalogy 102 (1) on page 37, DOI: 10.1093/jmammal/gyaa150, http://zenodo.org/record/785086
To the Question of Busha’s Rock Relief Attributes (the Analysis of the Superscription on a Framed Table)
No full textHere we have an overview of versions of graphic symbols’ recognition and the superscription interpretations by various authors, notably: А. Spitsyn, who interpreted the superscription as a Greek Medieval text; V. Danylenko, who dated the superscription to the 9th century, before the appearance of the Cyrillic characters; А. Formozov, who suggested the text to have appeared at the beginning of the 16th century; V. Berezyak, who recognized the superscription as a Polish text (1524). Earlier the author of the article suggested that the tablet contained the 2nd verse of the 41st psalm. Bad condition of the superscription caused many views. The author offers a few guidelines to interpret all versions and presents a new correct recognition and interpretation of the superscription.Продовження статті. Попередні частини див.: Студії мистецтвознавчі. – 2003. – чис. 3. – С. 62–69; 2004. – Чис. 3 (7). – С. 21–41; 2005. – Чис. 1 (9). – С. 29–48
On the Works of A. D. Stoliar about Paleolithic Art and on R. Ia. Zhurov's Criticisms of Them
No full textSearch for Non-Standard Neutrino Interactions with Borexino Phase II
No full textThe Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar-νe survival probability Pee(E), and the chiral couplings of the neutrino and electron. Some theories of physics beyond the Standard Model postulate the existence of Non-Standard Interactions (NSI's) which modify the chiral couplings and Pee(E). In this work, we search for such NSI's, in particularly neutral-current-like interactions that modify the νe−e and ντ−e couplings, using Borexino Phase II data. Standard Solar Model predictions of the solar neutrino fluxes for both high- and low-metallicity assumptions are considered. No indication of new physics is found at the level of sensitivity of the detector and constraints on the parameters of the NSI's are placed. In addition, with the same dataset the value of sin2θW is obtained with a precision comparable to that achieved in reactor antineutrino experiments.A.F. acknowledges the support provided by UHH and RFBR grant 16-02-01026
Serhiy Obolensky, a mammalogist, field scientist, and researcher of the steppe mammals
No full textEssay on one of the most productive researchers of mammals, a graduate of Kyiv University, a colleague of F. Dobrzhansky, I. Pidoplichko, B. Vinogradov, A. Formozov and others. The researcher specialized mainly in the study of steppe fauna, including faunas of Slobozhanshchyna, Chernozem, the North Caucasus, the Volga region, Mongolia and others. He focused on rodents, especially sousliks, voles, mice, and worked with bone materials (owl pellets, fossils, skull and tooth identification) and studied agricultural pests and topics of their control
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