Scaling of THz-conductivity at metal-insulator transition in doped manganites

Magnetic field and temperature dependence of the Terahertz conductivity and permittivity of the colossal magnetoresistance manganite Pr_{0.65}Ca_{0.28}Sr_{0.07}MnO_3 (PCSMO) is investigated approaching the metal-to-insulator transition (MIT) from the insulating side. In the charge-ordered state of PCSMO both conductivity and dielectric permittivity increase as function of magnetic field and temperature. Universal scaling relationships between the changes in permittivity and conductivity are observed in a broad range of temperatures and magnetic fields. Similar scaling is also seen in La_{1-x}Sr_xMnO_3 for different doping levels. The observed proportionality points towards the importance of pure ac-conductivity and phononic energy scale at MIT in manganites.Comment: 5 pages, 4 figure

Possible evidence for electromagnons in multiferroic manganites

Magnetodielectric materials are characterized by a strong coupling of magnetic and dielectric properties and in rare cases simultaneously exhibit both, magnetic and polar order. Among other multiferroics, TbMnO3 and GdMnO3 reveal a strong magneto-dielectric (ME) coupling and as a consequence fundamentally new spin excitations exist: Electro-active magnons, or electromagnons, i. e. spin waves which can be excited by ac electric fields. Here we show that these excitations appear in the phase with an incommensurate (IC) magnetic structure of the manganese spins. In external magnetic fields this IC structure can be suppressed and the electromagnons are wiped out, thereby inducing considerable changes in the index of refraction from dc up to THz frequencies. Hence, besides adding a new creature to the zoo of fundamental excitations, the refraction index can be tuned by moderate magnetic fields, which allows the design of a new generation of optical switches and optoelectronic devices.Comment: 4 Pages, 2 figure

Modern approaches to the treatment of postpartum purulent-septic diseases

The cohort prospective comparative study showed improvement of the management of patients with various forms of purulentseptic diseases (PSD). The study included 276 women with PSD admitted to the gynecological hospital from January 1, 2014 to December 31, 2016. The patients were divided into two cohorts depending on the clinical course, management, and outcomes, which corresponded to the clinical forms of PSD: uncomplicated and complicated. The parameters that were evaluated in patients in both groups included complaints, pregnancy course and childbirth, duration of manifestations of the disease, the clinical picture, laboratory parameters. The study resulted in the development of an algorithm for management of patients with PSD including lavage of the site of infection, adequate antibiotic therapy depending on the type of pathogen, infusion and anticoagulant therapy, and treatment of vaginitis. The developed algorithm for management of patients with various forms of postpartum PSD allowed all 276 (100%) participants to preserve reproductive function and avoid early postoperative complications

SEROLOGICAL DIAGNOSIS OF MODERN CHOLERA USING LIPOSOMAL ENTEROTOXIC DIAGNOSTICUM IN COMPLEMENT FIXATION TEST

Abstract. The possibility of serological diagnosis of cholera using cholera enterotoxic diagnostics kit in complement fixation test to detect anti-enterotoxic antibodies in sera of patients with cholera caused by hybrid variants of the El Tor biovar has been demonstrated. In patients with mild course of cholera anti-enterotoxic antibodies were detected in titres 1:50 and 1:200 in paired sera obtained on the 7th and 14th days of disease, respectively (fourfold titre increase). In patients with the course of medium severity 32-fold titre increase was recorded from the titre 1:100 in serum obtained on the fifth day of disease till the titre 1:3200 — on the twelfth day of disease. Antibodies titers reached 1:1600 and 1:800 were revealed in two medium course patients (adult and infant of 10 months) on the sixth day of disease

Prophylaxis of рurulent-septic diseases of postpartum period for high-risk puerperas

Background. Postpartum purulent-septic diseases are one of the topical issues of modern obstetrics due to high prevalence and absence of downward trend toward reduction in the disease incidence.Objective: improve the management of high risk puerperas to prevent the development of purulent-septic complications in the postpartum period.Materials and methods. The cohort prospective comparative study included 78 puerperas, who experienced spontaneous labour complicated by injuries to birth canals. The patients were divided into two groups according to the risk of developing purulentseptic complications and the management of patients. Group 1, control group, (n = 20) included the puerperas, who did not show any signs of inflammatory diseases of the genital tract during pregnancy. Group 2 included patients, who were diagnosed with various forms of vaginal dysbiosis based on the results of bacterioscopic and bacteriological examination of the genital tract. The group was further divided into two subgroups depending on the type of treatment. Subgroup 1 of Group 2 (n = 28) only received standard hygiene care, and subgroup 2 (n = 30) received standard hygiene procedures combined with vaginal irrigation using benzidamine hydrochloride solution (Tantum Rosa) for 3 days in the obstetric hospital.Results. The study resulted in improving postpartum care of high-risk puerperas to prevent purulent-septic complications. Discussion The test results showed that the use of benzidamine hydrochloride (Tantum Rosa) in the postpartum period prevents the purulent-septic complications of puerperium, such as inflammation and disruption of perineal muscle sutures and endometritis, as well as relieves pain and discomfort, and improves the puerperas’ quality of life.Conclusion: Based on the study results, we recommend the use of this drug in the early postpartum period to prevent purulentseptic complications in the high-risk groups