Proceedings of the Mongolian Academy of Sciences

Pc1 hydromagnetic emissions of chevron type

Parkhomov Vladimir Alexandrovich — 2023-12-29

The article presents the results of studying novel bursts of ULF emissions within 0.5–2.5 Hz (Pc1 geomagnetic pulsations) with a simultaneous increase (~0.01 Hz/min) and decrease in frequency (~0.01 Hz/min) lagging by ~5÷10 min from the initial mean frequency (~0.6 Hz). From their formal resemblance with the stripes on military officer uniforms, these emissions are called Pc1 chevrons. The bursts were observed during strong short-term geomagnetic disturbances (~1 hour): substorms with high gradient of ionospheric currents+ intensification (dD/dt or dH/dt ~1–1.3 nT/s).

We present the main parameters and couplings of these emissions with substorm geophysical phenomena of 11.02.1985, 06.04.1997 and 18.07.2013 events. Polar satellite observations of auroras are compared with LANL-91, 94 and THEMIS-A observations of charged particle fluxes. Possible mechanisms generating oscillations are also discussed.

Molecular phylogenetic identification of Artemisia l. Species from Mongolia

Bolortuya Ulziibat — 2023-12-29

The Artemisia L. genus, one of the largest genera in the Asteraceae family, consists of many medicinally important and phylogenetically unresolved species. To define the phylogenetic relationship of Artemisia species, nucleotide sequences of the nuclear ITS (Intergenic spacer DNA) region, chloroplast trnL-trnF intergenic spacer, partial sequences of plastid rbcL gene were identified from medicinally important 12 species included in 3 subgenera. The phylogenetic tree was constructed through the Neighbor-Joining and Maximum Parsimony analysis, respectively. The results of study revealed that the combination of the nucleotide sequences from the ITS and rbcL region was more efficient in determining the phylogenic relationship of species.

Result of the research on Sainfoin (Onobrychis sativa L) varieties in the Great Lake region of Mongolia

Zogsokh Batkhishig — 2023-12-29

This study aimed to determine a sainfoin variety best suited to the soil and weather conditions of the Great Lake Basin region inUlaangom soum of Uvs aimag (province). We carried out studies into five varieties of sainfoin, including Peschany 1251, Tashyl 3, Novosibirsky 1284, Shortandisky 83, and Mikhailovsky-5, which were compared with each other without irrigation trial. Sainfoin has a high resistance to cold winter conditions, high temperatures and and dry drought conditions. Sainfoin varieties growing in Mongolia are highly palatable perennial leguminous plants. According to the result of our research, sainfoin is well acclimatized to Uvs province’s soil and weather conditions. The variety with the highest performance showing is Taskhyl 3, which was generated atthe Plant Research Center of Khakassia, a republic of Russia located in southern Siberia.

Results of HDV RNA detection in male seminal fluid and female cervical swab samples using RT-PCR

Saruul Enkhjargal — 2023-12-29

Mongolia has an extremely high prevalence of hepatitis D virus (HDV), which leads to increased morbidity and mortality from hepatocellular carcinoma (HCC). HDV is the most severe form of chronic viral hepatitis (CVH). A recent study estimated that the prevalence of anti-HDV was 67.5% among hepatitis B surface antigen-positive cases in Mongolia. HDV infection is particularly prevalent in sexually active young people. The virus may be transmitted through sexual intercourse, and it is crucial to confirm this by detecting HDV RNA in semen and cervical swabs of patients with chronic hepatitis delta. This pilot study was conducted with 16 participants, including eight males and eight females. Viral RNA was isolated from the blood, male seminal fluid, and female cervical swab samples of all participants in the study. HDV RNA was quantified using RT-PCR in samples from blood, seminal fluid, and cervical swabs. This study found that the detection rate of HDV RNA differed between male and female samples, with 62.5% of seminal fluid samples in the male cohort being positive compared with 87.5% in the female cohort. The data shows a statistically significant difference between genders for the presence of HDVRNA in seminal fluid and cervical swabs (OR 0.238, 95% CI= 0.02-3.01). A significant correlation was found between blood HDV RNA quantity and HDV RNA presence status in seminal fluid and cervical swab samples, indicating a potential risk of sexual HDV transmission. The R² values for semen and cervical swab samples were 0.1095 and 0.9755, respectively.