Transverse spin dynamics in a spin-polarized Fermi liquid

The linear equations for transverse spin dynamics in weakly polarised degenerate Fermi liquid with arbitrary relationship between temperature and polarization are derived from Landau-Silin phenomenological kinetic equation with general form of two-particle collision integral. The temperature and polarization dependence of the spin current relaxation time is established. It is found in particular that at finite polarization transverse spin wave damping has a finite value at T=0. The analogy between temperature dependences of spin waves attenuation and ultrasound absorption in degenerate Fermi liquid at arbitrary temperature is presented. We also discuss spin-polarized Fermi liquid in the general context of the Fermi-liquid theory and compare it with "Fermi liquid" with spontaneous magnetization.Comment: 10 page

Electromagnetic waves in an axion-active relativistic plasma non-minimally coupled to gravity

We consider cosmological applications of a new self-consistent system of equations, accounting for a nonminimal coupling of the gravitational, electromagnetic and pseudoscalar (axion) fields in a relativistic plasma. We focus on dispersion relations for electromagnetic perturbations in an initially isotropic ultrarelativistic plasma coupled to the gravitational and axion fields in the framework of isotropic homogeneous cosmological model of the de Sitter type. We classify the longitudinal and transversal electromagnetic modes in an axionically active plasma and distinguish between waves (damping, instable or running), and nonharmonic perturbations (damping or instable). We show that for the special choice of the guiding model parameters the transversal electromagnetic waves in the axionically active plasma, nonminimally coupled to gravity, can propagate with the phase velocity less than speed of light in vacuum, thus displaying a possibility for a new type of resonant particle-wave interactions.Comment: 19 pages, 9 figures, published versio

Необходимость комплексного подхода к терапии у женщин с телогеновым выпадением волос, ассоциированным с железодефицитным состоянием

The relationship between disorders of iron metabolism and alopecia, in particular telogen hair loss (THL), remains poorly understood and requires further research. Goal. To assess changes in the dynamics of growth and hair condition in women with an iron deficiency state during systemic therapy with iron supplements in combination with and without physiotherapy. Methods. An open-label, randomized, comparative interventional study with a duration of 6 months included 26 female aged 19 to 54 years (38.8 8.9 years) with complaints of hair loss, changes in their structure, dryness and / or hair brittleness; with preserved menstrual cycle and mild iron deficiency anemia (IDA, Hb 101120 g/l). Trichoscopy and phototrichogram were performed with processing of the results in the TrichoScienceProv1.1 program. The changes in the dynamics of hair growth and condition were assessed against the background of the use of iron supplements in combination with physiotherapy and without physiotherapy. Pulsed alternating sinusoidal current of high frequency, high voltage and low strength was chosen as a physiotherapeutic method for the treatment of THL. Results. Against the background of the therapy, an increase in the Hb level (p 0.001) and a positive dynamics of trichological parameters in all patients were noted, the severity of which was higher when the therapy with iron supplements was combined with physiotherapy. Conclusion. Our findings confirm that the complex treatment of patients with telogen alopecia on the background of an iron deficiency state may achieve positive dynamics of trichological indicators.Взаимосвязь нарушения обмена железа и алопеции, в частности телогенового выпадения волос (ТВВ), сохраняется недостаточно изученной и требует дальнейших исследований. Цель. Оценить изменения динамики роста и состояния волос у женщин с железодефицитным состоянием при системной терапии препаратами железа в комбинации с физиотерапией и без физиотерапии. Методы. В открытое рандомизированное сравнительное интервенционное исследование длительностью 6 месяцев были включены 26 пациентов женского пола в возрасте от 19 до 54 лет (38,8 8,9 года) с жалобами на выпадение волос, изменение их структуры, сухость и/или ломкость волос по длине, сохраненным менструальным циклом и железодефицитной анемией (ЖДА) легкой степени тяжести (Hb 101120 г/л). Проводились трихоскопия и фототрихограмма с обработкой результатов в программе TrichoScienceProv1.1. Оценивалось изменение динамики роста и состояния волос на фоне применения препаратов железа в комбинации с физиотерапией и без физиотерапии. В качестве физиотерапевтического метода лечения ТВВ был выбран импульсный переменный синусоидальный ток высокой частоты, высокого напряжения и малой силы. Результаты. На фоне проводимой терапии отмечены увеличение содержания Hb (р 0,001) и положительная динамика трихологических показателей у всех пациентов, выраженность динамики была выше при сочетании терапии препаратами железа с физиотерапией. Заключение. Для достижения положительной динамики трихологических показателей у пациентов с телогеновой алопецией на фоне железодефицитного состояния целесообразно использовать комплексное лечение