Enhancement of Anisotropy due to Fluctuations in Quasi-One-Dimensional Antiferromagnets

It is shown that the observed anisotropy of magnetization at high magnetic fields in RbMnBr3 , a quasi-one-dimensional antiferromagnet on a distorted stacked triangular lattice, is due to quantum and thermal fluctuations. These fluctuations are taken into account in the framework of linear spin-wave theory in the region of strong magnetic fields. In this region the divergent one-dimensional integrals are cut off by magnetic field and the bare easy-plane anisotropy. Logarithmical dependence on the cutoff leads to the "enhancement" of the anisotropy in magnetization. Comparison between magnetization data and our theory with parameters obtained from neutron scattering experiments has been done.Comment: 15 pages + 5 postscript figures available upon request, RevTex

New Molecular Complex of Ammonium Glycyrrhizate with Rutin

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Received:03.11.2021. Revised: 21.12.2021. Accepted: 21.12.2021. Available online: 11.01.2022.A new 1:1 molecular complex of triterpene glycoside ammonium glycyrrhizate (GC) with flavonoid glycoside rutin (Rut) was obtained in aqueous ethanol. The stability constant (9.70.2)104 (mol/L)–1 was calculated for the complex via isomolar curves. The complexation was studied by UV- and ATR IR-Fourier spectroscopy and a method of isomolar series. The hydrogen bonds and hydrophobic interactions are formed in the molecular complex. A preliminary antioxidant activity assessment of the complex was made.This study was carried out with the experimental equipment of the Sevastopol State University (project PR/807-42/2017)

NEW MOLECULAR COMPLEX OF AMMONIUM GLYCYRRHIZATE WITH RUTIN

This study was carried out on the experimental equipment of the Sevastopol State University (project PR/807-42/2017)

Magnetoresistive study of antiferromagnetic--weak ferromagnetic transition in single-crystal La2_{2}CuO4+δ_{4+\delta}

The resistive measurements were made to study the magnetic field-induced antiferromagnetic (AF) - weak ferromagnetic (WF) transition in La$_2$CuO$_4$ single-crystal. The magnetic field (DC or pulsed) was applied normally to the CuO$_2$ layers. The transition manifested itself in a drastic decrease of the resistance in critical fields of ~5-7 T. The study is the first to display the effect of the AF -WF transition on the conductivity of the La$_2$CuO$_4$ single-crystal in the parallel - to - CuO$_2$ layers direction. The results provide support for the 3-dimensional nature of the hopping conduction of this layered oxide.Comment: 8 pages, 7 figures, RevTe

Sensitive Search for a Permanent Muon Electric Dipole Moment

We are proposing a new method to carry out a dedicated search for a permanent electric dipole moment (EDM) of the muon with a sensitivity at a level of 10^{-24} e cm. The experimental design exploits the strong motional electric field sensed by relativistic particles in a magnetic storage ring. As a key feature, a novel technique has been invented in which the g-2 precession is compensated with radial electric field. This technique will benefit greatly when the intense muon sources advocated by the developers of the muon storage rings and the muon colliders become available.Comment: 16 pages, 3 figures. Submitted for publication in Proceedings of the International Workshop on High Intensity Muon Sources (HIMUS99), KEK, Japan, December 1-4 199

First Observation of Self-Amplified Spontaneous Emission in a Free-Electron Laser at 109 nm Wavelength

We present the first observation of Self-Amplified Spontaneous Emission (SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109 nm wavelength (11 eV). The observed free-electron laser gain (approx. 3000) and the radiation characteristics, such as dependency on bunch charge, angular distribution, spectral width and intensity fluctuations all corroborate the existing models for SASE FELs.Comment: 6 pages including 6 figures; e-mail: [email protected]

Способность искусственных антигенных конструкций, содержащих эпитопы белков, ассоциированных с меланомой, стимулировать цитотоксическую активность мононуклеарных клеток периферической крови в отношении клеток меланомы

Aim. The aim of the study was to evaluate the ability of pMEL-TCI and pMEL-A0201 DNA-constructs encoding artificial polyepitope melanoma antigens to induce antitumor T cell immune response ex vivo. material and methods. Dendritic cells were obtained from peripheral blood mononuclear cells of HLA-A02:01-positive donors; DCs transfected with target DNA vaccine constructions were co-cultured with autologous T lymphocytes to stimulate anti-tumor effector T cells. Specific activity of ex vivo stimulated PBMC was assessed (1) by their ability to cause lysis of human melanoma Mel Is cells, and (2) by the level of their granzyme-producing activity. A recombinant plasmid encoding the full-length MART-1 melanoma antigen was used as a positive control. results. All DNA vaccine constructions as well as positive control construction were found to be able to stimulate specific anti-tumor immune responses of autologous PBMC ex vivo, and these PBMC were found to induce melanoma Mel Is cells lysis. Both the efficiency of induced cytotoxic responses and the level of granzymes production stimulated with DCs transfected with pMel-A0201 significantly exceeded those stimulated with DCs transfected with either pMel-TCI or with DNA construction encoding the full-length MART-1 protein. The cytotoxicity level correlates with the level of granzyme B production in CD8+ T lymphocytes. conclusion. DNA vaccine constructions encoding artificial polypeptides composed of tumor antigen epitopes can stimulate the antitumor cytotoxic response. This approach can be used as the basis for the development of new methods of immunotherapy for cancer.Цель исследования – оценить способность ДНК-конструкций pMEL-TCI и pMEL-A0201, кодирующих искусственные полиэпитопные антигены меланомы, стимулировать противоопухолевый ответ в системе индукции Т-клеточного ответа ex vivo. материал и методы. Изучение цитотоксической активности проводилось в системе индукции Т-клеточного ответа ex vivo с использованием мононуклеарных клеток (МНК) периферической крови HLA-A*02:01 позитивных доноров. Цитотоксическую активность оценивали двумя методами: 1) по способности МНК, стимулированных дендритными клетками, трансфицированными плазмидами pMEL-TCI и pMEL-A0201, вызывать лизис клеток меланомы человека линии Mel Is, а также 2) по уровню их гранзим-продуцирующей активности. В качестве положительного контроля использовалась рекомбинантная плазмида, кодирующая полноразмерный антиген клеток меланомы MART-1. Результаты. Полученные результаты показали, что дендритные клетки HLA-A*02:01+ доноров, трансфицированные плазмидными конструкциями pMel-A0201 и pMel-TCI, стимулировали цитотоксическую активность аутологичных МНК в отношении клеток меланомы Mel Is. Как по эффективности индукции цитотоксического ответа, так и по уровню стимуляции продукции гранзима B аллелеспецифическая конструкция достоверно превзошла конструкцию, кодирующую полноразмерный белок MART1. заключение. ДНК-вакцинные конструкции, кодирующие искусственные полипептиды, составленные из эпитопов опухолевых антигенов, способны стимулировать противоопухолевый цитотоксический ответ. Данный подход может послужить основой для разработки новых способов иммунотерапии онкологических заболеваний