Study of Dynamics of Geomagnetic Field at the Area of Chernigov Regional Anomaly

Исследована временная динамика Черниговской региональной магнитной аномалии на основании магнитометрических наблюдений 2008-2012гг. За эти четыре года модуль индукции геомагнитного поля B увеличился на 140 нТл. На этом фоне выделены незначительные временные изменения аномалий ΔB регионального (ΔΔB±1,5 нТл/год) характера. Первые из них хорошо интерпретируются подмагничиванием источника магнитной аномалии, а вторые – предположительно флюидными процессами в геодинамически активных глубинных краевых разломах Днепровско-Донецкого рифта.Time dynamics of geomagnetic field in the region of Chernigov regional magnetic anomaly was investigated using the records of magnetometry observations at 2008 – 2012 years. During these four years the induction module B increased by 140 nT. Against this background trend, the low-level anomalous time variations ΔB were observed regionally (ΔΔB ± 1,5 nT / year). The regional variations are interpreted as a result of magnetization of the magnetic source. The local variations are supposed to be generated by the fluid processes in geodynamic active deep faults of the Dnieper-Donets rift

Histaminergic system in brain disorders: lessons from the translational approach and future perspectives

Histamine and its receptors were first described as part of immune and gastrointestinal systems, but their presence in the central nervous system and importance in behavior are gaining more attention. The histaminergic system modulates different processes including wakefulness, feeding, and learning and memory consolidation. Histamine receptors (H1R, H2R, H3R, and H4R) belong to the rhodopsin-like family of G protein-coupled receptors, present constitutive activity, and are subjected to inverse agonist action. The involvement of the histaminergic system in brain disorders, such as Alzheimer’s disease, schizophrenia, sleep disorders, drug dependence, and Parkinson’s disease, is largely studied. Data obtained from preclinical studies point antagonists of histamine receptors as promising alternatives to treat brain disorders. Thus, clinical trials are currently ongoing to assess the effects of these drugs on humans. This review summarizes the role of histaminergic system in brain disorders, as well as the effects of different histamine antagonists on animal models and humans

Spatial-temporeral changes in the geomagnetic field and seismisity

This paper presents the results of an analysis of spatial-temporeral changes in the Earth’s magnetic field and its seismicity for the period 1950—2015. The International Geomagnetic Field of the 12 generation (BIGRF-12) was analyzed. This model allows one to study the characteristic features of magnetic anomalies with dimensions of the first thousands of kilometers. To determine the temporal changes in the geomagnetic field (dB/dt), digital datasets of BIGRF were developed for the period 1950—2015 in a 1°Ч1° grid and for an interval of 5 years. Temporal changes were divided into the virtual long-wave core-generated and short-wave mantle-lithospheric — generated components. There were revealed 2 negative and 3 positive foci of the core-generated component. For the 65 y period the component changes in these foci range from –6600 to 2000 nT (from –100 to 30 nT/y), the foci being characterized by the significant westward drift. 12 positive and 10 negative foci were delineated in the mantle-lithospheric-caused component. During 65 years most of the foci do not change their location. The changes in magnitude of positive and negative foci are 175—490 nT, (2,5—7,5 nT/y) and –(220—535) nT, (–(3,4—8,2) nT/y) respectively. In the southwestern domain of the Earth the intensity of seismicity is lower and the core-originated component is significantly decreased in comparison with the northwestern domain. The relationship is observed between areas of increased seismic activity, foci of the mantle-lithospheric component of the geomagnetic field and areas of its positive increase, which tectonically correspond to the junction zones of lithospheric plates of the «subduction», «collision» and «mid-ocean-rift» types. On the basis of the regularities revealed, two mechanisms of such an association are proposed: a) «temperature-magnetic», caused by discending the magnetic blocks of the oceanic crust in a subduction zone and also serpentinization of ultrabasic rocks of the upper mantle; b) «fluid-gas-magnetic», based on the formation and transformation of ferruginous minerals under the influence of the mantle gases and fluids. The magnetic blocks of the Earth’s lithosphere are more solid than those of the non-magnetic. Therefore, within the blocks, as well as on their margins, the accumulation of large stresses is possible and, consequеntly, the preconditions are created for the formation of earthquake foci

Spatial-temporeral changes in the geomagnetic field and seismisity

This paper presents the results of an analysis of spatial-temporeral changes in the Earth’s magnetic field and its seismicity for the period 1950—2015. The International Geomagnetic Field of the 12 generation (BIGRF-12) was analyzed. This model allows one to study the characteristic features of magnetic anomalies with dimensions of the first thousands of kilometers. To determine the temporal changes in the geomagnetic field (dB/dt), digital datasets of BIGRF were developed for the period 1950—2015 in a 1°Ч1° grid and for an interval of 5 years. Temporal changes were divided into the virtual long-wave core-generated and short-wave mantle-lithospheric — generated components. There were revealed 2 negative and 3 positive foci of the core-generated component. For the 65 y period the component changes in these foci range from –6600 to 2000 nT (from –100 to 30 nT/y), the foci being characterized by the significant westward drift. 12 positive and 10 negative foci were delineated in the mantle-lithospheric-caused component. During 65 years most of the foci do not change their location. The changes in magnitude of positive and negative foci are 175—490 nT, (2,5—7,5 nT/y) and –(220—535) nT, (–(3,4—8,2) nT/y) respectively. In the southwestern domain of the Earth the intensity of seismicity is lower and the core-originated component is significantly decreased in comparison with the northwestern domain. The relationship is observed between areas of increased seismic activity, foci of the mantle-lithospheric component of the geomagnetic field and areas of its positive increase, which tectonically correspond to the junction zones of lithospheric plates of the «subduction», «collision» and «mid-ocean-rift» types. On the basis of the regularities revealed, two mechanisms of such an association are proposed: a) «temperature-magnetic», caused by discending the magnetic blocks of the oceanic crust in a subduction zone and also serpentinization of ultrabasic rocks of the upper mantle; b) «fluid-gas-magnetic», based on the formation and transformation of ferruginous minerals under the influence of the mantle gases and fluids. The magnetic blocks of the Earth’s lithosphere are more solid than those of the non-magnetic. Therefore, within the blocks, as well as on their margins, the accumulation of large stresses is possible and, consequеntly, the preconditions are created for the formation of earthquake foci

The spatial-temporal structure of the magnetic field of Ukraine's territory: assessment of the contribution of internal and external sources

Estimation of c ontribution of those or other sources in total magnetic field of the Earth is important i n c onnection wi th s eparation of i ts c onstituents with the p urpose of research of their nature, m echanism of origin etc. In this article s ome aspects of s ubdivision of internal and external s ources of the magnetic field of the E arth are c onsidered, as well as estimation of c ontribution of different s ources in the total fi eld and its variations is given. F or the s olving of the p rob-lem results of observations have been used of Ukrainian magnetic observatories fi rst of all