Low-temperature spin relaxation in n-type GaAs

Low-temperature electron spin relaxation is studied by the optical orientation method in bulk n-GaAs with donor concentrations from 10^14 cm^{-3} to 5x10^17 cm^{-3}. A peculiarity related to the metal-to-insulator transition (MIT) is observed in the dependence of the spin lifetime on doping near n_D = 2x10^16 cm^{-3}. In the metallic phase, spin relaxation is governed by the Dyakonov-Perel mechanism, while in the insulator phase it is due to anisotropic exchange interaction and hyperfine interactio

Productivity of herbages of different varieties of variegated alfalfa (

The research was carried out in 2021-2024 in the conditions of the southern regions of Karelia. The soil of the experimental site is sod-podzolic, medium loamy, (pH — 5.8). The variability of weather conditions in the accounting years allowed to unlock the potential of the studied species. The purpose of the study is to evaluate the formed varietal-microbial systems based on the most adaptive varieties and cultivars of alfalfa to the conditions of the region, with medium-term hay use. The object of the study is variegated alfalfa varieties and cultivars of the breeding of the Federal Williams Research Center of Forage Production & Agroecology named after V. R. Williams Agnia VIC, Pastbischnaya 88, Taisiya, 506 (Lusya) and SGP-387 and a strain of nodule bacteria A-1, provided by the FSBSI All-Russian Research Institute of Agricultural Microbiology. It has been established that the most adapted to medium-term use for hay (mowing in the budding phase - the beginning of flowering) in the Republic of Karelia are the cultivar 506 (Lusya) and the Agnia VIC variety when inoculating seeds with a strain of nodule bacteria A-1

Risk assessment of pesticide intake with local food products for adult health of the city of Кazan

© 2020, Editorial board of Journal of Experimental Biology and Agricultural Sciences. All rights reserved. The current study was carried out to access the effect of DDT and HCH contaminated local food consumption on the adult population of Kazan city. Unexpectedly, the computations considered outcomes for a wide range of food items that are covered by the dietary admission model have hazard appraisal. The degrees of non-cancer-causing hazards for the strength of the grown-up populace related with the complex entry of DDT and HCCH at the median (Ме) level and the level of the 95th percentile with the basic food groups are identified. The ongoing dietary danger evaluation and at the degree of the 95th Percentile showed that the likelihood of Tatarstan inhabitants being presented to pesticide buildup levels that could prompt high (HI =13.41) negative wellbeing results. Such high levels of risk need urgent actions on the decrease of pesticide concentration and imply the development and implementation of planned curative measures

Comprehensive assessment of the carcinogenic risk to adolescent health of chemicals

The value of total carcinogenic risk on peroral, inhalation and dermal routes of entry for the adolescent population in all zones under study corresponded to high risk level, the highest values being observed in the 1st zone (the Kirovsky district), and the lowest ones in the 4th zone (the Privolzhsky district). The priority routes of carcinogen entry into the human body were peroral and inhalation routes. Foods and drinking water, as well as atmospheric air were revealed to be the leading substance transport media in forming individual carcinogenic risk. The major carcinogens forming risk were lead (1.36Е-04), chloroform (1.20Е-04) and cadmium (7.09E-04) entering with water and arsenic (8.38Е-05) – with soil. The leading position among atmospheric air carcinogens in all city zones under study belonged to soot (5.51Е-04). The priority pollutant present in foods and defining carcinogenic health risk was lead (2.02E-03). Complex assessment of carcinogenic risk in case of multimedium routes of the chemicals’ entry showed that there was a risk of developing carcinogenic effects for the adolescents’ health on daily intake of contaminants, which made TНCR=0.01632