scholarly journals Influence of Oxidants on the Stability of Tocopherol in Model Nanoemulsions: Role of Interfacial Membrane Organized by Nonionic Emulsifiers

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Jinhyuk Kim ◽  
Ha Youn Song ◽  
Seung Jun Choi
Keyword(s):  
Degradation Rate ◽  
Storage Stability ◽  
Tocopherol Concentration ◽  
Initial Concentration ◽  
The Stability ◽  
The Impact ◽  
Mediated Oxidation ◽  
Interfacial Membrane ◽  
Interfacial Characteristics

Nanoemulsions were prepared by using emulsifiers with various sizes of hydrophilic and hydrophobic groups to determine the impact of interfacial characteristics on the stability of α-tocopherol incorporated into the nanoemulsions. The α-tocopherol concentration remaining after 3 weeks of storage at 25°C depended greatly on the type of oxidative stress, which indicated that the environment surrounding the oil droplets could determine the stability of α-tocopherol in nanoemulsions. α-Tocopherol was gradually degraded by radical-mediated oxidation over storage, and approximately 60% of its initial concentration remained after 3 weeks of storage. However, under acid- and iron-mediated oxidation, α-tocopherol concentration steeply decreases for the initial 3-day storage, but the degradation rate of α-tocopherol decreased after 3 days of storage and over 90% of the initial α-tocopherol remained after 3 weeks of storage. Interestingly, and contrary to our expectations, the thickness and/or density of the droplet interfacial membrane rarely affected the stability of α-tocopherol incorporated into nanoemulsions. Although it is difficult to generalize beyond α-tocopherol, we conclude that the properties of oil droplet surfaces had no influence on the storage stability of α-tocopherol encapsulated in the droplets.

Factors affecting the amplitude of the τ angle in proteins: a revisitation

2017 ◽  
Vol 73 (7) ◽  
pp. 618-625 ◽  
Author(s):  
Nicole Balasco ◽  
Luciana Esposito ◽  
Luigi Vitagliano
Keyword(s):  
Protein Structures ◽  
Factors Affecting ◽  
X Ray ◽  
Backbone Conformation ◽  
Potential Factors ◽  
The Stability ◽  
Major Factors ◽  
The Impact ◽  
Open Issues

The protein folded state is the result of the fine balance of a variety of different forces. Even minor structural perturbations may have a significant impact on the stability of these macromolecules. Studies carried out in recent decades have led to the convergent view that proteins are endowed with a flexible spine. One of the open issues related to protein local backbone geometry is the identification of the factors that influence the amplitude of the τ (N—Cα—C) angle. Here, statistical analyses performed on an updated ensemble of X-ray protein structures by dissecting the contribution of the major factors that can potentially influence the local backbone geometry of proteins are reported. The data clearly indicate that the local backbone conformation has a prominent impact on the modulation of the τ angle. Therefore, a proper assessment of the impact of the other potential factors can only be appropriately evaluated when small (φ, ψ) regions are considered. Here, it is shown that when the contribution of the backbone conformation is removed by considering small (φ, ψ) areas, an impact of secondary structure, as defined byDSSP, and/or the residue type on τ is still detectable, although to a limited extent. Indeed, distinct τ-value distributions are detected for Pro/Gly and β-branched (Ile/Val) residues. The key role of the local backbone conformation highlighted here supports the use of variable local backbone geometry in protein refinement protocols.

scholarly journals Le rôle des entreprises et leurs comportements sur la stabilité du système financier

2021 ◽  
Vol 14 (2) ◽  
pp. 85-103
Author(s):  
Farelle Yandza Ikahaud ◽  
Mohamed El Haddad
Keyword(s):  
Bibliometric Analysis ◽  
Empirical Work ◽  
Financial System ◽  
The State ◽  
Scientific Interest ◽  
Number Of Publications ◽  
The Stability ◽  
The Impact

Investment determines the sustainability and prosperity of an economy. The paper seeks to (1) give an overview of the roles of companies on the stability of the financial system, based on existing theoretical and empirical work; and (2) to highlight the reasons which expose them to the non-application of their duties against the State. For this purpose, a bibliometric analysis using the Direct Science database was employed. The results of the analysis allowed us to study the search trend by analyzing the distribution of publications, authors, types of publications and fields of research and also showed that the themes of the study are of great scientific interest because of the surge in the number of publications on the role of companies over the last ten years averaging 76.3 per year while 1,690 were on the impact of company behaviour on the stability of the financial system.

Structural and functional analysis of reconnaissance and fire system and decomposition of its functions and subsystems

2021 ◽  
pp. 38-48
Author(s):  
O. Maistrenko ◽  
O. Karavanov ◽  
A. Shcherba
Keyword(s):  
Functional Analysis ◽  
Fire Damage ◽  
Expert Group ◽  
Expert Evaluation ◽  
Military Conflicts ◽  
Main Factors ◽  
The Stability ◽  
The Impact

It is established that the role of reconnaissance and fire systems in the implementation of enemy fire damage in military conflicts occurring at the beginning of the XXI century. Increased  to 75%. However, it was found that the effectiveness of these systems depends on the quality of their equipment. The main factors that are often not taken into account in the acquisition are the possibility, interoperability, stability of each element, the impact of elements on the stability of each other and the functioning of the RVS as a whole. The analysis of recent research and publications has shown that as of today, the approaches to determining the composition of reconnaissance fire systems taking into account these factors are not justified. Given the above, it was decided to conduct a structural and functional analysis of the reconnaissance fire system and the decomposition of its functions and subsystems. To this end, based on the method of cluster analysis, an algorithm for combining a set of tasks performed by reconnaissance and fire systems into groups has been developed and substantiated. The method of expert evaluation was used to obtain substantiated data on the implementation of such a merger. According to the proposed algorithm, the main tasks were first identified, which involve reconnaissance and fire systems. Subsequently, an expert group was formed and the coefficient of relative competence of each member of the expert group was determined. The experts were then asked to combine the identified tasks according to their characteristics into an arbitrary number of groups. After processing the opinions of experts, 10 characteristic groups were identified. Finally, the experts were asked to combine the obtained groups in such a way that each association consisted of similar objects and the objects of different associations differed significantly. The results of the work revealed the functional interconnectedness of the tasks, processes and subsystems of the reconnaissance and fire system. It is also established that a typical reconnaissance fire system will consist of three subsystems (control, reconnaissance and fire influence), which perform specific functions for each of them.

scholarly journals Increasing sulfate levels show a differential impact on synthetic communities comprising different methanogens and a sulfate reducer

2019 ◽  
Vol 16 (154) ◽  
pp. 20190129 ◽  
Author(s):  
Jing Chen ◽  
Matthew J. Wade ◽  
Jan Dolfing ◽  
Orkun S. Soyer
Keyword(s):  
Microbial Communities ◽  
Methane Production ◽  
System Stability ◽  
Sulfate Reducer ◽  
Differential Impact ◽  
Sulfate Reducers ◽  
Hydrogenotrophic Methanogens ◽  
The Stability ◽  
The Impact

Methane-producing microbial communities are of ecological and biotechnological interest. Syntrophic interactions among sulfate reducers and aceto/hydrogenotrophic and obligate hydrogenotrophic methanogens form a key component of these communities, yet, the impact of these different syntrophic routes on methane production and their stability against sulfate availability are not well understood. Here, we construct model synthetic communities using a sulfate reducer and two types of methanogens representing different methanogenesis routes. We find that tri-cultures with both routes increase methane production by almost twofold compared to co-cultures and are stable in the absence of sulfate. With increasing sulfate, system stability and productivity decreases and does so faster in communities with aceto/hydrogenotrophic methanogens despite the continued presence of acetate. We show that this is due to a shift in the metabolism of these methanogens towards co-utilization of hydrogen with acetate. These findings indicate the important role of hydrogen dynamics in the stability and productivity of syntrophic communities.

Features of Forming of Profits of Commercial Banks in Terms of Coronaries

2020 ◽  
Vol 8 (6) ◽  
pp. 75-82
Author(s):  
A. Novikov ◽  
A. Zverev ◽  
M. Mishina
Keyword(s):  
Commercial Banks ◽  
Banking System ◽  
Internal Factors ◽  
Russian Economy ◽  
Internal Characteristic ◽  
The Stability ◽  
Constituent Elements ◽  
The Impact ◽  
Entire Economy

A significant role of the banking system in ensuring the functioning of the entire economy, by means of organizing the movement of borrowed capital between individual industries and the implementation of financial needs is achieved only if this system, and therefore its constituent elements, are stable. In this regard, the stability of the banking system should be considered as a fundamental internal characteristic, which ensures the existence and stable development of the Bank in a market economy under the influence of external and internal factors. In 2020, commercial banks were faced with the impact of the coronavirus pandemic on the Russian economy and the banking system in particular. At the same time, the current situation of banks ' functioning is characterized not only by the presence of a corona crisis, but also by the internal development of the system itself, which, following the uberization of the world economy, dictates to commercial banks the need to develop and implement financial technologies and form ecosystems. In these conditions, the need for commercial banks in financial resources increases, which is reflected in the increasing role of profit in the Bank's activities and development. This article focuses on the impact of the coronavirus pandemic on the banking system of the Russian Federation and the economy as a whole, and also identifies the features of profit formation and the specifics of the functioning of commercial banks in the coronavirus crisis period.

scholarly journals Mathematical analysis of an age structured epidemic model with a quarantine class

2021 ◽  
Author(s):  
Bedreddine AINSEBA ◽  
Tarik Touaoula ◽  
Zakia Sari
Keyword(s):  
Reproduction Number ◽  
Asymptotic Behavior Of Solutions ◽  
Model Parameters ◽  
Qualitative Behavior ◽  
Asymptotically Stable ◽  
Globally Asymptotically Stable ◽  
Age Structured ◽  
The Stability ◽  
The Impact

In this paper, an age structured epidemic Susceptible-Infected-Quarantined-Recovered-Infected (SIQRI) model is proposed, where we will focus on the role of individuals that leave their class of quarantine before being completely recovered and thus will participate again to the transmission of the disease. We investigate the asymptotic behavior of solutions by studying the stability of both trivial and positive equilibria. In order to see the impact of the different model parameters like the relapse rate on the qualitative behavior of our system, we firstly, give the explicit expression of the epidemic reproduction number $R_{0}.$ This number is a combination of the classical epidemic reproduction number for the SIQR model and a new epidemic reproduction number corresponding to the individuals infected by a relapsed person from the R-class. It is shown that, if $R_{0}\leq 1$, the disease free equilibrium is globally asymptotically stable and becomes unstable for $R_{0}>1$. Secondly, while $R_{0}>1$, a suitable Lyapunov functional is constructed to prove that the unique endemic equilibrium is globally asymptotically stable on some subset $\Omega_{0}.$

scholarly journals Information and Statistical Efforts of Selected Safety Network Institutions in the Area of Financial System Stability

2019 ◽  
pp. 143-157
Author(s):  
Piotr Komorowski ◽  
Dariusz Filip
Keyword(s):  
Public Good ◽  
Statistical Data ◽  
Financial System ◽  
System Stability ◽  
Main Role ◽  
Overall Stability ◽  
System Information ◽  
The Stability ◽  
The Impact

Financial system stability is considered a public good. The main role of the financial safety network is to stabilise the system. Information and statistical activities of institutions which belong to the safety network are the tools which may improve the stability. We need to stress that most decisions are based on information, in particular decisions on investment or speculation, hence by providing information and statistical data these institutions indirectly enhance the overall stability of the system. An overview and analysis of selected studies addressing financial system stability helped the authors draw theoret- ical and practical conclusions as to the stability itself and the impact of information and statistics upon its improvement.

scholarly journals NATO’s Role in Ensuring Security in the Conditions of Changes in the Global Energy Landscape

2021 ◽  
Vol 7 (2) ◽  
pp. 1-7
Author(s):  
Yaryna Turchyn ◽  
◽  
Olha Ivasechko ◽  
Keyword(s):  
Energy Security ◽  
Energy System ◽  
Critical Energy ◽  
Centers Of Excellence ◽  
Important Place ◽  
Raising Awareness ◽  
The Stability ◽  
The Military ◽  
The Impact

The article identifies key problems on the path of energy security and the role of NATO in solving them. The Alliance’s position on the energy issue has been determined. The documents of the NATO summits in Bucharest in 2008, in Chicago in 2012, and the NATO 2010 Strategic Concept have been analyzed. It turned out that the Alliance has divided its role into three areas: raising awareness; protecting critical energy infrastructure and deepening energy efficiency in the military. The role of Centers of Excellence, their specialization, and goals have been investigated. The impact of hybrid wars on energy security has been also considered. The actions of the Russian Federation to deteriorate energy security through cyberattacks in order to weaken the role and defensive actions of NATO have been highlighted. It is noted that cooperation with Ukraine is a promising direction for ensuring the energy security of the Alliance. The key tasks that Ukraine faces for the stability of its energy system have been identified. It is concluded that the work of NATO occupies an important place in protecting energy security, because the Alliance managed to clearly define the directions of its activities in this area.

scholarly journals The impact of banking sector development on economic growth: Comparative analysis of Ukraine and some EU countries

2021 ◽  
Vol 18 (2) ◽  
pp. 193-208
Author(s):  
Nadiya Rushchyshyn ◽  
Olha Mulska ◽  
Yuliia Nikolchuk ◽  
Mariia Rushchyshyn ◽  
Taras Vasyltsiv
Keyword(s):  
Economic Growth ◽  
Banking Sector ◽  
Principal Component ◽  
Causality Analysis ◽  
Eu Countries ◽  
Banking Sector Development ◽  
Reverse Relationship ◽  
The Stability ◽  
The Impact

The effective functioning of the banking sector has a key impact on the stability of economic growth. The study is aimed at monitoring the banking sector development and identifying causality between the banking sector and economic growth. The methodological tools of the research are Principal component analysis, causal relationship, and vector regression modeling. The empirical study is based on the World Bank databank by eight components (for integral analysis) and seven indicators (for causality analysis). The study presents an improved algorithm for monitoring the level of banking sector development based on calculating the integral coefficient. According to assessment, the level of banking sector development and realization of its potential in Ukraine is low and significantly inferior to the EU countries; in 2000–2019, the development of the banking sector in Ukraine was 0.061-0.153. The results obtained confirmed the large discrepancy in the development of Ukraine’s banking sector with some EU countries (the highest lag values were observed with the Czech Republic and Poland). The causality analysis revealed a strong favorable relationship between the level of development of the banking sector in Ukraine and GDP per capita (0.796), a moderate one – with foreign direct investment (0.400), and a reverse relationship with the level of national poverty (0.678). This study is of practical value for identifying two possible trajectories of a country’s development, namely, sustainable development and economic turbulence, and has allowed forming a conceptual vision of the role of the banking sector in achieving social and economic goals.

scholarly journals Digitalizing Islamic Philanthropy in Overcoming Post-pandemic Economic Turbulence

2021 ◽  
Vol 1 ◽  
pp. 258-268
Author(s):  
Muhammad Ainul Yaqin ◽  
Chairina Mazaya ◽  
Diina Auliya
Keyword(s):  
Public Interest ◽  
Economic Recession ◽  
Humanitarian Aid ◽  
Quick Response ◽  
The Public ◽  
Qualitative Descriptive ◽  
Descriptive Approach ◽  
The Stability ◽  
The Impact

The COVID-19 pandemic has resulted in a recession in Indonesia. Islamic philanthropy is a solution offered by Islamic economics in an effort to overcome the impact of economic turmoil due to the COVID-19 pandemic. Islamic philanthropic institutions need to innovate, one of which is through digitalizing aid-raising (zakat, infaq, alms). This study aims to determine public interest in the philanthropic movement and the role of digitalization of Islamic philanthropy in reducing the impact of the economic recession in society. This study uses a qualitative descriptive approach with the object of research is the ACT (Quick Response Action) in Surakarta. The data obtained were sourced from observations, interviews and related literature studies. Research informants came from donation institutions (ACT), donors and recipients of donations. The results showed that during the pandemic, people's motivation to share increased. This positive interest, coupled with the role of digitalizing donation payments, has made it easier for the public to pay for donations. This momentum has proven to trigger the optimization of fundraising for humanitarian aid donations in helping affected communities, so as to reduce the potential for economic turmoil by maintaining the stability of people's purchasing power.

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