Contribution of the charged Higgs boson to the production of a <Emphasis Type="Italic">tb</Emphasis> pair in hadron collisions

The contribution of the charged Higgs boson to the production of a tb pair in pp collisions at LHC is investigated. It is shown that, due to H^±-boson exchange, the total yield of tb pairs is modified significantly for small and large values of tan β. At small values of tan β, the production of right-handed t quarks is also expected, however, in contrast to what occurs in the case of only W^±-boson exchange, generating left-handed t quarks exclusively. This fact provides the possibility of separating the H^± and W^± contributions by investigating the angular distributions of products originating from top-quark decay. A detailed simulation of signal and relevant background processes is performed.     

Study of Medieval Russian Enamel Pendant Using a Complex of Nondestructive Methods

Crystallography Reports - A medieval Russian bronze pendant icon with enamel images, dated to the period from the 12th to the first half of the 13th century was studied. The investigation was...     

Tomographic Studies of the Terracotta Head from Kerch Bay

Crystallography Reports - An ancient terracotta sculpture (bearded male head), found in underwater excavations in the Kerch Bay (performed by experts of the Institute of Archaeology of the Russian...     

Delta Sleep-Inducing Peptide Recovers Motor Function in SD Rats after Focal Stroke

Background and Objectives: Mutual effect of the preliminary and therapeutic intranasal treatment of SD rats with DSIP (8 days) on the outcome of focal stroke, induced with intraluminal middle cerebral occlusion (MCAO), was investigated. Materials and Methods: The groups were the following: MCAO + vehicle, MCAO + DSIP, and SHAM-operated. DSIP or vehicle was applied nasally 60 (±15) minutes prior to the occlusion and for 7 days after reperfusion at dose 120 µg/kg. The battery of behavioral tests was performed on 1, 3, 7, 14, and 21 days after MCAO. Motor coordination and balance and bilateral asymmetry were tested. At the end of the study, animals were euthanized, and their brains were perfused, serial cryoslices were made, and infarction volume in them was calculated. Results: Although brain infarction in DSIP-treated animals was smaller than in vehicle-treated animals, the difference was not significant. However, motor performance in the rotarod test significantly recovered in DSIP-treated animals. Conclusions: Intranasal administration of DSIP in the course of 8 days leads to accelerated recovery of motor functions.     

Study of Bronze Statues “John the Baptist” and “Dancing Cupid” from the Collections of the Pushkin State Museum

Crystallography Reports - Bronze statues “John the Baptist” and “Dancing Cupid” from the collections of the Pushkin State Museum of Fine Arts have been investigated at the...     

The Effect of an Iodine-Free Diet on the Pharmacokinetics of the <Superscript>211</Superscript>At Preparation

The pharmacokinetics of the Astatine-211 radiopharmaceutical was investigated after a single injection in male SD (Sprague–Dawley) rats that had normal and iodine-free diets. Twelve groups of SD male rats were examined in the study. The tested drug was intravenously injected into the tail vein of the animals once at a volume of 10 mL/kg and dose of 100 μCi per animal. In the study, the animals were subjected to necropsy at specific time points with retrieval of the organs and tissues for further analysis of the activity of the samples using a well-type scintillation gamma spectrometer. It was found that the ²¹¹At absorption by the thyroid in the male rats that had an iodine-free diet was greater than in the rats that had a conventional diet.     

Modern Methods of Neutron Radiography and Tomography in Studies of the Internal Structure of Objects

Crystallography Reports - The fundamentals, experimental possibilities, and applications of the methods of neutron radiography and tomography in studies of the structural features of large objects...     

Effect of deuterium on phase transformations in fullerenes at high temperatures and high pressures

The effect deuterium has on phase transformations is studied for amorphous and crystalline fullerenes C₆₀ and C₇₀ at high temperatures of up to 1300°C and high pressures (2–8 GPa). Amorphous fullerene phases are obtained via long grinding in a planetary mill. Structure is studied by means of neutron diffraction. In all cases, amorphous graphite (nanographite) forms in the temperature range of 800–1100°C. This material has different diffraction spectra distinguished by the heights of the halos observed on the graphite diffraction maxima and their relative intensities. These spectra (the structure of nanographite) are affected by preliminary amorphization, the number of carbon atoms in the fullerenes (C60 or C70), and the introduction of deuterium atoms. The different spectra of amorphous (disordered) graphite testify to its varying structure.