Controlling the topological sector of magnetic solitons in exfoliated Cr1/3_{1/3}NbS2_2 crystals

We investigate manifestations of topological order in monoaxial helimagnet Cr$_{1/3}$NbS$_2$ by performing transport measurements on ultra-thin crystals. Upon sweeping the magnetic field perpendicularly to the helical axis, crystals thicker than one helix pitch (48 nm) but much thinner than the magnetic domain size ($\sim$1 $\mu$m) are found to exhibit sharp and hysteretic resistance jumps. We show that these phenomena originate from transitions between topological sectors with different number of magnetic solitons. This is confirmed by measurements on crystals thinner than 48 nm --in which the topological sector cannot change-- that do not exhibit any jump or hysteresis. Our results show the ability to deterministically control the topological sector of finite-size Cr$_{1/3}$NbS$_2$ and to detect inter-sector transitions by transport measurements.Comment: 7 pages, 8 figure

Role of viral infection in the etiopathogenesis of breast cancer

The viral nature of many female genital cancers is now beyond question; however, the role of viral infection in the pathogenesis of breast cancer (BC) has not been adequately investigated. The paper defines the importance of a number of viruses in the etiopathogenesis of on- cogynecological diseases. It presents the results of examining 60 patients with Stages I-IV BC and 30 patients with fibrocystic mastopathy, in whom the presence of DNA-containing virus genomes in tumor tissue was compared, and the data of polymerase chain reaction study of genital tract smears. It is shown that human papillomaviruses and cytomegaloviruses do not play a fundamental role in the develop- ment of BC; there is no valid evidence for Epstein–Barr virus

Formation of ultracold RbCs molecules by photoassociation

The formation of ultracold metastable RbCs molecules is observed in a double species magneto-optical trap through photoassociation below the ^85Rb(5S_1/2)+^133Cs(6P_3/2) dissociation limit followed by spontaneous emission. The molecules are detected by resonance enhanced two-photon ionization. Using accurate quantum chemistry calculations of the potential energy curves and transition dipole moment, we interpret the observed photoassociation process as occurring at short internuclear distance, in contrast with most previous cold atom photoassociation studies. The vibrational levels excited by photoassociation belong to the 5th 0^+ or the 4th 0^- electronic states correlated to the Rb(5P_1/2,3/2)+Cs(6S_1/2) dissociation limit. The computed vibrational distribution of the produced molecules shows that they are stabilized in deeply bound vibrational states of the lowest triplet state. We also predict that a noticeable fraction of molecules is produced in the lowest level of the electronic ground state

Dzyaloshinskii--Moriya interaction: How to measure its sign in weak ferromagnetics?

Three experimental techniques sensitive to the sign of the Dzyaloshinskii--Moriya interaction are discussed: neutron diffraction, Moessbauer gamma-ray diffraction, and resonant x-ray scattering. Classical examples of hematite (alpha-Fe2O3) and MnCO3 crystals are considered in detailComment: 5 pages, 1 figure; to be published in JETP Letter

The impact of cardiovascular and metabolic disease at the time of development of occupational chronic fluoride intoxication in workers of aluminium production

With the aim of studying the effect of disorders of carbohydrate and lipid exchange and associated cardiovascular disease at the time of development of occupational fluorosis assessed the prevalence of this disease among workers in aluminum production. A significant dissociation of carbohydrate and lipid metabolism indices against the background of high prevalence of overweight, obesity, arterial hypertension in workers in contact with elevated concentrations of inorganic fluorine compounds was established in comparison with patients of the comparison group who are not exposed to toxic substances (р=0,003, t=3,159). The increase in fasting glycemia was revealed already with the work experience of up to 10 years, which can testify to the danger of early development of type 2 diabetes in workers of aluminum production and the need for timely preventive measures in this category of workers. At the same time, patients with occupational fluorosis had significantly higher prevalence of carbohydrate metabolism disorders compared to trained workers without occupational fluorosis (р=0,006). It was revealed that professional fluorosis develops significantly earlier in workers with concomitant cardiovascular dis-ease and metabolic changes.С целью изучения влияния нарушений углеводного и липидного обмена и сопутствующей кардиоваскулярной патологии на сроки развития профессионального флюороза проведена оценка распространенности данной патологии у работников алюминиевого производства. Установлена значимая диссоциация показателей углеводного и липидного обмена на фоне высокой распространенности избыточной массы тела, ожирения, артериальной гипертензии у рабочих, контактирующих с повышенными концентрациями неорганических соединений фтора, по сравнению с пациентами группы сравнения, не подвергающихся воздействию токсических веществ: повышенная гликемия натощак диагностирована у 23% пациентов основной группы и только у 6% рабочих группы сравнения (р=0,003, t=3,159). Выявлено повышение гликемии натощак уже при стаже работы до 10 лет, что может свидетельствовать об опасности раннего развития сахарного диабета 2 типа у рабочих алюминиевых производств и необходимости проведения своевременных профилактических мероприятий у данной категории работников. В то же время у больных профессиональным флюорозом установлена достоверно более высокая распространенность нарушений углеводного обмена по сравнению со стажированными работниками без профессионального флюороза (р=0,006). Выявлено, что профессиональный флюороз достоверно раньше развивается у работников с сопутствующей сердечно-сосудистой патологией и метаболическими изменениями