Optimal stock portfolio diversification under market constraints

The problem of optimal portfolio diversification is considered. Based on mathematical models of the dynamics of the market value formation of a single share and an optimal stock portfolio, the structure of the optimal portfolio is determined. Such models are built in a class of ordinary differential equations. One of the problems of optimal investing is optimizing the expected return of the stock portfolio for the desired level of risk. Another problem is the choice of the stock portfolio with the same expected return, but with a smaller risk. For this purpose, we use a set of acceptable and effective portfolios. This sequence of steps of the algorithm allows consistently solve two optimization problems. The problem of portfolio diversification consists of the problem of determining the moments of time and the necessity to perform such a diversification. In the article, we constructed an algorithm for determining these points of time, based on the solution of an optimal control problem. The application of this algorithm enables to select an optimal risk portfolio at a certain level of its expected profitability. It uses an efficient and acceptable set of investment portfolios

Authigenic dolomite of Bazhen source successions as an indicator of the final stage of hydrocarbon generation

Petrographic observations, substantiated by the X-ray phase examinations, have revealed dissimilar character of the secondary dolomite development within the highly bituminous rocks of the Bazhenov formation. The mineral in question has not been found in any dry holes. In the low- and medium-flow-rate wells (160-2160 tons per day), it, alongside with other minerals, is more or less uniformly distributed in the principal bituminous mass, impregnates it, producing a peculiar 'starry arch' pattern in thin rock sections. In case of high oil influxes (more than 80 tons per day), the amount of newly formed dolomite rises sharply, its nature and localization character alter. It is important to emphasize, that the dry holes are maximally remote from the faults, and the most productive well has been drilled directly within the tectonic dislocation zone. The rest of the low- and medium-flow-rate wells occur in the intermediate positions relative to the faults. Productivity of the Bazhenov Formation and generation of authigenous dolomite are controlled by the rock heating degree. Increased temperatures (at about 200°C) are required for normal dolomite generation. Within the settings of tectonohydrothermal activation of the Western Siberian Plate, hydrocarbon generation in the oil and gas source rocks occurs under the following temperatures: oil - from 60 to 170°C, oil + gas condensate - from 150 to 200°C). The investigation results show that the algal authigenous dolomite from the Bazhenov formation has not resulted from diagenesis; it has originated autonomously, due to heating of the highly bituminous, Mg and Cacomprising rocks. The absence or the presence of algal dolomite in situ indicates whether the highly bituminous source series of the Bazhenov Formation has been subjected to the stage of final hydrocarbons generation or not. The areas with the occurrences of algal authigenous dolomite should be regarded as the areas of intense (final) hydrocarbons generation by the Bazhenov deposits

Role of IL-6 in the immunopathogenesis of mild, moderate and severe TBI

Traumatic brain injury (TBI) results in a significant inflammatory burden that increase the production of inflammatory mediators and biomarkers. The immune system plays a key role in the pathogenesis of traumatic brain injury. Neuroinflammatory mediators released from resident glia (activated microglia and astrocytes) inside the brain recruit immune cells where cytokines are small soluble proteins that confer instructions and mediate communication among immune and non-immune cells. Interleukin-6 (IL-6) is a proinflammatory cytokine known to be elevated after trauma, and a major contributor to the inflammatory response following TBI. Previous studies have investigated associations between IL-6 and outcome following TBI, but to date, studies have been inconsistent in their conclusions. The purpose of the current study was to assessment of cerebrospinal fluid (CSF) interleukin-6 (IL-6) and MBP levels in patients with TBI. Samples of cerebrospinal fluid of 85 patients with TBI were examined. Concentrations IL-6 were measured via xMAP multiplexing technology. The control was the course of CSF in patients with concussion. An increased content was found in all patients with traumatic brain injury: 19.59 pg/mL in the group with mild traumatic brain injury; 103.6 pg/mL in the group with moderate traumatic brain injury; and 2225 pg/mL in the group with severe traumatic brain injury load versus 2.58 pg/mL in the control group. A direct correlation was found with the presence of basic myelin proteins in the cerebrospinal fluid, which indicates the degree of damage and neurodegeneration processes. Identification of the features of IL-6 content in patients with brain injury may indicate its important role in the course of disease. It also requires additional more detailed study, including comparison with IL-6 content in peripheral blood

Карбофункциональные кремнийазотсодержащие органические соединения – исходное сырье в синтезе линейных и гетероциклических продуктов

The results of the study on reactions of reetherification and acylation of 3-aminopropyltryethoxysilan and 2-(aminoethyl)-3-(trymethoxysilyl)propylamine are presented. The possibility of preparation of the line and geterocycle organosilicon compounds containing nitrogen is shown. The schemes of processes that pass on the initial steps of preparation of polymerizing adgesives are proposed.Представлены результаты изучения реакции переэтерификации и ацилирования 3- аминопропиллтриэтоксисилана и 2-(аминоэтил)-3-(триметоксисилил)пропиламина. Показана возможность получения линейных и гетероциклических кремний- содержащих продуктов независимо от числа атомов азота в молекуле. Предложены схемы процессов, протекающих при использовании синтезированных соединений на начальных стадиях получения полимеризационных клеев

Алкоксисиланы – синтез и применение. I. Синтез алкоксисиланов

Alkoxysilanes is the unique class of organosilicon compounds that have various fields of the application.This review summarizes results of research on the synthesis of these productsАлкоксисиланы – уникальный класс кремнийорганических соединений, имеющих разнообразные области практического использования. В обзоре обобщены исследования по синтезу данных продуктов

Алкоксисиланы – Синтез и применение. II. «Прямой синтез», свойства и области прикладного использования.

The review summarizes studies on the «direct synthesis» of alkoxysilanes. Their properties and areas of practical use are considered.В обзоре обобщены исследования по «прямому синтезу» алкоксисиланов, рассмотрены их свойства и области прикладного использования

Plasma cytokines in patients with COVID-19 during acute phase of the disease and following complete recovery

COVID-19, an infection caused by the new coronavirus SARS-CoV-2, is associated with a number of pathophysiological mechanisms, mobilizing a wide spectrum of biomolecules, mainly, cytokines.The purpose of this study was to evaluate levels of multiple cytokines in blood plasma from the patients with COVID-19 during acute phase of the disease, and upon complete recovery. Samples of peripheral blood plasma of 56 patients with COVID-19, 69 convalescents and 10 healthy individuals were examined. Concentrations of 46 molecules, such as IL-1α, IL-1β, IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, IL-9, IL-12 (p40), IL-12 (p70), IL-13, IL-15, IL-17A/CTLA8, IL-17-E/IL-25, IL-17F, IL-18, IL-22, IL-27, IFNα2, IFNγ, TNFα, TNFβ/ Lymphotoxin-α (LTA), CCL2/MCP-1, CCL3/MIP-1α, CCL4/MIP-1β, CCL7/MCP-3, CCL11/Eotaxin, CCL22/MDC, CXCL1/GROα, CXCL8/IL-8, CXCL9/MIG, CXCL10/IP-10, CX3CL1/Fractalkine, IL-1ra, IL-10, EGF, FGF-2/FGF-basic, Flt3 Ligand, G-CSF, M-CSF, GM-CSF, PDGF-AA, PDGF-AB/ BB, TGF-α, VEGF-A were measured via xMAP multiplexing technology. Significantly increased levels of 18 cytokines were found in blood plasma from COVID-19 patients during acute phase of the disease (as compared to control group), i.e., IL-6, IL-7, IL-15, IL-27, TNFα, TNFβ/Lymphotoxin-α (LTA), CCL2/MCP-1, CCL7/MCP-3, CXCL1/GROα, CXCL8/IL-8, CXCL10/IP-10, CXCL9/MIG, IL-1rа, IL-10, M-CSF, GM-CSF, VEGF-A. We found a significant decrease of nearly all the mentioned cytokines in recovered patients, in comparison with those who had moderate, severe/extremely severe disease. Moreover, we revealed a significantly decreased level of 8 cytokines in plasma from convalescents, as compared with control group, i.e., IL-1α, IL-2, IL-9, IL-12 p40, IL-18, CCL22/MDC, Flt3 Ligand, TGF-α. Immune response caused by SARS-CoV-2 infection involves multiple cytokines, mostly, with pro-inflammatory effects. We have shown for the first time that the convalescence phase is characterized by significantly lower levels of cytokines which regulate cellular differentiation and hematopoiesis (in particular, lymphocytes, T-cells and NK-cells). Over acute phase of the disease, the levels of these cytokines did not change. We revealed a significant decrease of most plasma cytokines upon recovery as compared to acute phase. On the contrary, acute phase of the disease is accompanied by significant increase of both pro- and antiinflammatory cytokines in blood plasma

The Psychological Science Accelerator’s COVID-19 rapid-response dataset

In response to the COVID-19 pandemic, the Psychological Science Accelerator coordinated three large-scale psychological studies to examine the effects of loss-gain framing, cognitive reappraisals, and autonomy framing manipulations on behavioral intentions and affective measures. The data collected (April to October 2020) included specific measures for each experimental study, a general questionnaire examining health prevention behaviors and COVID-19 experience, geographical and cultural context characterization, and demographic information for each participant. Each participant started the study with the same general questions and then was randomized to complete either one longer experiment or two shorter experiments. Data were provided by 73,223 participants with varying completion rates. Participants completed the survey from 111 geopolitical regions in 44 unique languages/dialects. The anonymized dataset described here is provided in both raw and processed formats to facilitate re-use and further analyses. The dataset offers secondary analytic opportunities to explore coping, framing, and self-determination across a diverse, global sample obtained at the onset of the COVID-19 pandemic, which can be merged with other time-sampled or geographic data

The Psychological Science Accelerator's COVID-19 rapid-response dataset

In response to the COVID-19 pandemic, the Psychological Science Accelerator coordinated three large-scale psychological studies to examine the effects of loss-gain framing, cognitive reappraisals, and autonomy framing manipulations on behavioral intentions and affective measures. The data collected (April to October 2020) included specific measures for each experimental study, a general questionnaire examining health prevention behaviors and COVID-19 experience, geographical and cultural context characterization, and demographic information for each participant. Each participant started the study with the same general questions and then was randomized to complete either one longer experiment or two shorter experiments. Data were provided by 73,223 participants with varying completion rates. Participants completed the survey from 111 geopolitical regions in 44 unique languages/dialects. The anonymized dataset described here is provided in both raw and processed formats to facilitate re-use and further analyses. The dataset offers secondary analytic opportunities to explore coping, framing, and self-determination across a diverse, global sample obtained at the onset of the COVID-19 pandemic, which can be merged with other time-sampled or geographic data

The role of the mitochondria and the endoplasmic reticulum contact sites in the development of the immune responses

Abstract Mitochondria and endoplasmic reticulum (ER) contact sites (MERCs) are dynamic modules enriched in subset of lipids and specialized proteins that determine their structure and functions. The MERCs regulate lipid transfer, autophagosome formation, mitochondrial fission, Ca2+ homeostasis and apoptosis. Since these functions are essential for cell biology, it is therefore not surprising that MERCs also play a critical role in organ physiology among which the immune system stands by its critical host defense function. This defense system must discriminate and tolerate host cells and beneficial commensal microorganisms while eliminating pathogenic ones in order to preserve normal homeostasis. To meet this goal, the immune system has two lines of defense. First, the fast acting but unspecific innate immune system relies on anatomical physical barriers and subsets of hematopoietically derived cells expressing germline-encoded receptors called pattern recognition receptors (PRR) recognizing conserved motifs on the pathogens. Second, the slower but very specific adaptive immune response is added to complement innate immunity. Adaptive immunity relies on another set of specialized cells, the lymphocytes, harboring receptors requiring somatic recombination to be expressed. Both innate and adaptive immune cells must be activated to phagocytose and process pathogens, migrate, proliferate, release soluble factors and destroy infected cells. Some of these functions are strongly dependent on lipid transfer, autophagosome formation, mitochondrial fission, and Ca2+ flux; this indicates that MERCs could regulate immunity