Short-term Deviations Research Articles

Interconnected Stock Markets: Analysing Cointegration and Correlation among Global Stock Indices

This study examines the long-term and short-term relationships among five major global stock indices—NSE NIFTY (India), S&P 500 (USA), FTSE 100 (UK), Hang Seng (Hong Kong), and Nikkei 225 (Japan)—over the period from 2008 to 2023. Using advanced econometric techniques such as Johansen cointegration tests, Engle-Granger residual cointegration test and the Vector Error Correction Model (VECM), the research explores the degree of interconnectedness and cointegration among these indices. The results indicate strong positive correlations between NSE NIFTY, S&P 500, and Nikkei 225, suggesting a growing synchronization of these markets due to global economic integration. Johansen's test reveals the presence of multiple long-term equilibrium relationships, affirming that despite short-term deviations, these markets tend to move together in response to global macroeconomic factors. The analysis further highlights that the S&P 500 and FTSE 100 indices exhibit significant error correction mechanisms, underscoring their leadership role in global market dynamics. In contrast, NSE NIFTY shows a weaker adjustment toward long-term equilibrium, indicating its reactive nature to changes in other global indices, particularly the S&P 500. The study finds that while Hang Seng and Nikkei 225 are connected globally, their short-term linkages appear weaker, likely influenced by regional factors. Overall, the results emphasize the critical influence of the U.S. and Japanese markets on NSE NIFTY, with both long-term cointegration and short-term market dynamics shaping the Indian stock market’s movements. This research offers key insights for investors seeking to understand global stock market interdependencies and manage portfolio risk.

Research on the optimal pick-up heights and their control strategy for the hydraulic double-row jet collector of the manganese nodule miner

As a superior pick-up device in manganese nodule miners (MNMs), the moving velocity and pick-up height of a hydraulic double-row jet collector (HDJC) are key to its collection performance. In this study, coupled computational fluid dynamics and the discrete element method (CFD‒DEM) is employed to numerically explore the optimal pick-up heights for various velocities. The collection efficiency decreases with increasing velocity and pick-up height but stabilizes at velocities below 0.6 m/s and pick-up heights below 115 mm. Lower pick-up heights increase seafloor disturbance. For high collection efficiency and low environmental damage, the optimal pick-up heights are 115 mm at 0.2–0.6 m/s and 105 mm at 0.6–1.0 m/s. Based on these pick-up heights, fuzzy proportional-integral-derivative (PID) control is developed to adjust the HDJC in the MNM multibody dynamics (MBD) model, which integrates hydraulic and control subsystems. This shows high robustness and responsiveness, ensuring excellent trafficability and mining capacity. Velocity, target value, and terrain variations cause significant short-term deviations. On flat ground, the pick-up heights deviate within 5 mm and the pick-up angles remain between ±0.025° across all velocities. During movement on flat-slope ground at maximum velocity, deviations in the pick-up height and angle remain below 10 mm and 0.2°.

ECM Insights into Domestic Savings, Investment and Economic Growth Dynamics in Nigeria

It is impossible to overstate the importance of investments and savings for the overall growth of an economy. The study examined Nigeria's dynamics of domestic savings, investment and economic growth through the Error correction mechanism (ECM). With the use of time series data from 1990 to 2021, the study seeks to discover the interplay between foreign direct investment, interest rates, capital formation, and domestic savings within the Nigerian economy. The study found that foreign direct investment coupled with a relatively stable interest rate played a critical role in enhancing domestic savings and fostering economic growth. Additionally, the analysis showed that capital formation and foreign direct investment positively and significantly impacted domestic savings. The error correction model shows that any short-term deviations from long-term equilibriums between savings, investment and growth are corrected over time, reinforcing the importance of policy consistency. A key recommendation is that the government implement policies that encourage saving and maintaining macroeconomic stability, creating a stable environment with investment opportunities and attractive interest rates that will strengthen savings, foster capital formation, and drive long-term economic growth. The paper shows the need for a strategic approach to managing both domestic and foreign investments to ensure sustainable economic development in Nigeria.

When Jack isn't Jacques: Simultaneous opposite language-specific speech perceptual learning in French-English bilinguals.

Humans are remarkably good at understanding spoken language, despite the huge variability of the signal as a function of the talker, the situation, and the environment. This success relies on having access to stable representations based on years of speech input, coupled with the ability to adapt to short-term deviations from these norms, e.g. accented speech or speech altered by ambient noise. In the last two decades, there has been a robust research effort focused on a possible mechanism for adjusting to accented speech. In these studies, listeners typically hear 15 - 20 words in which a speech sound has been altered, creating a short-term deviation from its longer-term representation. After exposure to these items, listeners demonstrate "lexically driven phonetic recalibration"-they alter their categorization of speech sounds, expanding a speech category to take into account the recently heard deviations from their long-term representations. In the current study, we investigate such adjustments by bilingual listeners. French-English bilinguals were first exposed to nonstandard pronunciations of a sound (/s/ or /f/) in one language and tested for recalibration in both languages. Then, the exposure continued with both the original type of mispronunciation in the same language, plus mispronunciations in the other language, in the opposite direction. In a final test, we found simultaneous recalibration in opposite directions for the two languages-listeners shifted their French perception in one direction and their English in the other: Bilinguals can maintain separate adjustments, for the same sounds, when a talker's speech differs across two languages.

Harberger-Laursen-Metzler Hypothesis: An Analysis with ARDL Bounds Test Approach

The Harberger, Laursen, and Metzler (HLM) hypothesis posits that a positive (negative) change in terms of trade, ceteris paribus, will lead to positive (negative) movements in the trade balance. When tested on developing countries, the hypothesis yields varying results. Some studies validate the hypothesis, while others suggest it is not applicable. Additionally, causality tests examining long-term relationships also produce different outcomes. Türkiye ranks among the countries with significant trade deficit issues. Therefore, testing the validity of the HLM hypothesis in the context of Türkiye is of great importance. The motivation of this study is to examine the impact of changes in terms of trade on the long-term trade balance in Türkiye from 2013 to 2023. In this context, both the volume and unit value of the terms of trade are considered. According to the findings, there is a positive relationship from terms of trade to the trade balance. Short-term deviations are found to be corrected within approximately three months. The causality test indicates that terms of trade are a Granger cause of the trade balance, and this causality is unidirectional. In this study, Türkiye's terms of trade and trade balance data for the specified periods were meticulously analyzed, and the validity of the HLM hypothesis was carefully tested. The analysis results provide strong evidence supporting the HLM hypothesis. These findings offer significant insights for Türkiye's economy and trade policies.

EVALUATING THE SHELF LIFE OF ESCIN

The determination of drug shelf life is vital for ensuring quality and stability, considering factors such as extraction, storage, transportation, and others to establish ideal storage conditions and expiration dates. While standard stability tests follow industry guidelines, the unique challenges posed by conducting accelerated tests for some temperature-sensitive drugs, such as herbal medicines, necessitate reliance on natural (continuous) tests as the primary method for determining stability. Positive results from accelerated tests may indicate that stability can be maintained despite short-term deviations under normal storage conditions. Consequently, real-time continuous testing plays a pivotal role in determining and validating the optimal shelf life following drug registration, simulating actual storage conditions during circulation. In light of these considerations, the shelf life of Escin was determined only through natural testing

Work-family conflict and strain: Revisiting theory, direction of causality, and longitudinal dynamism.

Does work-family conflict (WFC) cause psychological strain or vice versa? How long do these effects take to unfold? What is the role of persistent WFC (or strain) levels in these processes? Prior research has left some of these questions open: Our systematic review reveals that WFC-strain studies have primarily used short (e.g., hours) or long (e.g., years) measurement lags, leaving mid-long lags underexplored. Moreover, while many work-family theories imply long-term effects, prior longitudinal research has often relied on cross-lagged panel models that assume effects to be solely within-person, not considering persistent between-person differences. We tested this assumption in five three-wave survey studies (N = 26,133) with varying lags (1 day, 1 week, 1 month, 6 months, 1 year) and found it to fail in all cases. Employing the random-intercept crossed-lagged panel, a new approach in WFC research, our results indicate that the effects between WFC and strain (exhaustion, perceived stress, and affective rumination) depend primarily on longer term WFC (or strain) levels. In contrast, short-term deviations from these levels (within-person effects) play a minor role. These findings suggest that the effects between WFC and strain may be more persistent than previously assumed, opening avenues for further theoretical and empirical development. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Predictors of Life Expectancy at Birth In Turkiye: A Longitudinal Study

ABSTRACT Objective: The aim of this study is to examine the impact of social, behavioral, economic and healthcare system related factors on life expectancy at birth in Turkiye. Methods: Enrollment rate in tertiary education, tobacco consumption gram per capita, out-of-pocket payments and GDP per capita were included as predictors. The data was obtained from the database of OECD, World Bank and Health Statistics Yearbooks published by Ministry of the Health for 2000-2019. Johansen Cointegration test was used to define the existence of the long-run statistical relationship between life expectancy at birth and the predictors. Results: Enrollment rate in tertiary education, GDP per capita and out-of-pocket payments are positively associated with life expectancy, while tobacco consumption gram per capita has a negative association. It has been concluded that short-term deviations from the equilibrium, using an error correction model, will reach long-term equilibrium approximately one year later. Granger causality test and the estimation result revealed that enrollment rate in tertiary education, tobacco consumption, out-of-pocket health expenditure, GDP per capita are the short-term and long-term causes of life expectancy at birth. Conclusion: This study provides important evidence for policymakers to allocate resources to the social, behavioral, healthcare-related and economic determinants of health status to increase life expectancy. In addition, the determination of out-of-pocket payments to have a positive relationship with life expectancy gives a clue about the need to make more efforts regarding the economic accessibility of healthcare services in the Turkish health system.

Temperature and water availability drive insect seasonality across a temperate and a tropical region.

The more insects there are, the more food there is for insectivores and the higher the likelihood for insect-associated ecosystem services. Yet, we lack insights into the drivers of insect biomass over space and seasons, for both tropical and temperate zones. We used 245 Malaise traps, managed by 191 volunteers and park guards, to characterize year-round flying insect biomass in a temperate (Sweden) and a tropical (Madagascar) country. Surprisingly, we found that local insect biomass was similar across zones. In Sweden, local insect biomass increased with accumulated heat and varied across habitats, while biomass in Madagascar was unrelated to the environmental predictors measured. Drivers behind seasonality partly converged: In both countries, the seasonality of insect biomass differed between warmer and colder sites, and wetter and drier sites. In Sweden, short-term deviations from expected season-specific biomass were explained by week-to-week fluctuations in accumulated heat, rainfall and soil moisture, whereas in Madagascar, weeks with higher soil moisture had higher insect biomass. Overall, our study identifies key drivers of the seasonal distribution of flying insect biomass in a temperate and a tropical climate. This knowledge is key to understanding the spatial and seasonal availability of insects-as well as predicting future scenarios of insect biomass change.

Analysis of the impact of agricultural credits on agricultural mechanization in Türkiye

Agricultural mechanization is one of the high-cost important inputs used in agricultural production. Thanks to agricultural mechanization, time and manpower are saved greatly in the agricultural production process. Agricultural loans, one of the most important agricultural financing instruments, are considered necessary for agricultural enterprises to invest in agricultural mechanization. This study, which adopts a quantitative research method approach, aimed to analyze the impact of agricultural loans on agricultural mechanization in Türkiye using time series analysis. Within the scope of the purpose, annual data covering the period 1981-2022 were gathered from data sources related to loans and agricultural mechanization. A log-log model was constructed with loans as the independent variable and agricultural mechanization as the dependent variable, and ARDL bounds testing method was applied in the estimation of the model. According to the findings obtained from the estimation of the model, there was a long-term, positive, and statistically significant co-integration relationship between loans and agricultural mechanization variables. A 1% increase in the loan balance was found to increase agricultural mechanization by approximately 0.035%. On the other hand, the short-term relationship between the variables was found to be negative and statistically significant. Short-term deviations from the long-term equilibrium caused by shocks were shown to vanish by approximately 86% after 1 period. In this context, it is clear that the adaptation process between the variables is very rapid.

The Determinants of Prices of Fan Tokens as a New Sports Finance Tool

In the Covid-19 era, the income sources of sports clubs decreased, but the importance of fan tokens as new communication, management, and income source for sports clubs increased with Blockchain technology. For this reason, the relationships between fan token prices and club success, transaction volume, and attractiveness factors were examined and the important determinants of fan token prices were tried to be revealed. To determine the most suitable methods for panel data model, first of all, cross-section dependence, homogeneity, and unit root tests were carried out. Then the durbin test was performed and it was concluded that the variables were cointegrated. Finally, the coefficients were examined with the PMG/ARDL test and it was observed that the most important determinants of fan token prices were club success and transaction volume, respectively. While these factors affect fan token prices positively, the effect of the attractiveness factor is seen as less important and negative compared to other factors. In addition, in the error correction model established, the existence of a long-term equilibrium relationship between the variables was confirmed. It was concluded that the short-term deviations returned to the equilibrium after approximately 21 days.

Requirements for the information on reference standards submitted in the dossier for biologicals

SCIENTIFIC RELEVANCE.The use of appropriately certified reference standards (RSs) is a necessary element of analytical procedure standardisation that ensures comparability of results across different laboratories assessing the quality of medicines, which is important for the quality control of biologicals. Marketing authorisation involves providing information on RSs, but no specific requirements are given for the relevant section of the dossier. Therefore, it is necessary to develop the requirements for the appropriate guidelines.AIM.This study aimed to develop specific requirements for the materials that should be included in the Reference Standards section of the dossier for a biological product.DISCUSSION.The authors analysed national and international regulatory frameworks governing RSs for biologicals, including documents by the World Health Organisation (WHO), the Eurasian Economic Union, the International Organisation for Standardisation (ISO), and the Russian Federal Agency for Technical Regulation and Metrology. Additionally, the authors analysed the experience of RS certification and use at the Scientific Centre for Expert Evaluation of Medicinal Products. This article covers specific aspects of biological RS certification, considering the differences between measurement techniques and analytical procedures. The authors formulated the key requirements for the documents submitted in the dossier section on RSs for biologicals (biological reference materials). The methods (analytical procedures) used for RS certification should be described in accordance with the requirements for standard operating procedures. Adequate validation studies should establish the necessary validation characteristics of these analytical procedures. Additionally, this article presents the requirements developed to certify primary RSs for structure confirmation of proteins in novel biologicals. The values of certified characteristics and critical quality indicators should be established, and the RS production technology should be described and in compliance with WHO recommendations and/or Good Manufacturing Practice (GMP) standards. The basic certification stages are common to all types of RSs. The RS shelf life should be established in real-time stability studies, whereas accelerated stability testing may be useful for studying degradation mechanisms and the effects of short-term deviations from the specified storage conditions. In accordance with WHO recommendations, the Reference Standards section of the registration dossier should specify changes to the RS that require regulatory approval.CONCLUSIONS.The authors believe that the requirements for the materials in the Reference Standards section of the dossier for a biological product, as systematised in this study for inclusion in the relevant guidelines, will provide a unified approach to RS development, certification, and documentation for applicants, developers, and competent authority experts and will streamline RS consideration during marketing authorisation.

Quantitative Analysis and Comparative Review of Dividend Policy Dynamics within the Banking Sector: Insights from Global and U.S. Financial Data and Existing Literature

This paper presents a comparative review of academic research on dividend policies and payments within the banking sector. Dividends represent a critical area of focus due to their implications for bank capital levels, profitability, regulatory compliance, and investor signaling. The literature reviewed spans pre- and post-2008 financial crisis periods and adopts both global and emerging market perspectives. Methodologies include regression analyses, causality tests, descriptive statistics, and financial ratio computations based on regulatory filings, financial statements, and market data datasets. Key findings demonstrate the multifaceted nature of bank dividend strategies, differences across countries, shifts during crises, and complex interplays with financial health metrics. The studies find evidence that dividends provide valuable signals to investors on earnings prospects, aligning with signaling theories. However, interpreting crisis-induced behaviors warrants caution due to short-term deviations. Opportunities exist for further analysis of cross-country variances, crisis responses, and linkages to bank stability. This comparative review enhances academic comprehension of bank dividend policies' motivations, outcomes, and determinants. It highlights the need for judicious balancing of stakeholder demands for returns and growth, an increasingly crucial endeavor amidst global uncertainty.

Exploring the relationship between trade openness and economic growth in Nepal: Insights from ARDL bound test cointegration analysis

The capacity of foreign trade to substantially raise GDP via increased exports, heightened competition, and enhanced efficiency holds the key to bolstering economic growth and prosperity. Recognizing this transformation underscores the importance of shaping Nepal’s economic policies and development strategies for achieving lasting sustainable growth. The objective of this study is to investigate how trade openness has affected Nepal’s economic growth, given its importance in the nation’s overall development. By analyzing the correlation between trade openness and economic expansion, policymakers and researchers can uncover the role of international trade in driving Nepal’s economic advancement. The research methodology involves constructing a regression model using the Autoregressive Distributed Lag bound test, with variables analyzed in growth form and subjected to the Augmented Dickey-Fuller and residual tests. The study’s results indicate a strong positive relationship between trade openness and economic growth in Nepal from 1975 to 2020, with a long-term equilibrium observed. Short-term deviations from equilibrium are quickly corrected at 38.23% annually, highlighting the importance of balanced export and import growth for economic development. The study concludes that trade openness drives Nepal’s economic growth for sustainable development and environmental protection. It offers valuable insights for policymakers and stakeholders to enhance economic growth and overall development of the country.

New Short-Long-Term Degradation Model for Precise Battery Health Prognostics

Battery health prognostic plays a crucial role in safe operation of electrical devices. Battery degradation modeling is a crucial step for battery health prognostics. Currently, since most existing battery prognostic models only consider entire long-term degradation trends during modeling, battery degradation modeling is still not precise and lacks short-term deviations to sufficiently reflect strong complexity and volatility of degradation processes. To solve this problem, a new battery prognostic method is proposed by simultaneously considering long-term degradation tendency and short-term volatility. Because Wiener process and Ornstein-Uhlenbeck process have ability to respectively model long-term degradation tendency and short-term volatility, a short-long-term degradation model is accordingly proposed by linearly fusing two stochastic processes. Additionally, the proposed model can characterize modeling uncertainty and observation uncertainty. Besides, this paper proves that the proposed model follows a log-normal distribution, which provides solid foundations for state-space modeling. Here, the purpose of formulating the proposed model to a state-space model with multiple cross-correlation hidden state variables is to better describe individual battery degradation using on-line battery capacity data. Health prognostics can be easily realized by extrapolating the updated model to a failure threshold. Results show that our proposed method performs well than contrast methods for battery health prognostics.

The Impact of Taxes on Prices and Production in Jordan

Purpose: This study aims to demonstrate the impact of taxes on prices and production in Jordan. Theoretical framework: Study problem lies in asking the following questions Does the tax system in Jordan serve the economic aspects? Does the tax in Jordan affect the economic aspect? Is the tax in Jordan fair? Is there an impact of the tax on prices in Jordan? Is there an impact of the tax on production in Jordan? What is the effect of taxes on consumer speeding on necessary versus luxury goods? What is the impact of higher taxes on personal income of consumers? The effect of Lower taxes on the economy and disposable income? What is the alternative for governments to increase their income other than direct higher tax system? What is the effect of various government entities; such as financial, administrative, and social corruption on Jordan economy? Design/methodology/approach: Researchers used standard analysis method and vector error correction model for the period (2011-2020), and used the profit margin ratio indicator as a representative indicator for production and prices. Findings: Results showed a long-term causal relationship between prices and production; from one side and direct and indirect taxes; from the other side and that relationship between short-term deviations and long-term reliability is corrected at a rate of (3%) per year. Results showed a negative significant impact of indirect taxes on price competitiveness; in the long term which was reinforced by the variance components’ analysis and response function’s test. Results also showed an insignificant impact of direct and indirect taxes on price competitiveness; in the short term. Research, Practical & Social implications: Demonstrating the impact of taxes on prices and production in Jordan. As well as, discussing the governmental tax and income. Originality/value: The importance of study stems from research topic, since taxes have multiple effects on various areas in society which can be divided into scientific and practical importance.

ANALYSIS OF REGULATORY DOCUMENTATION AND TECHNICAL REQUIREMENTS REGARDING THE FUNCTIONING OF THE NETWORK IN "ISLAND MODE"

The article examines main issues regarding the admissibility and conditions of operation of microgrids in the so-called " islanding mode" (IM), namely: identification of the appearance of an IM, regulatory and legal aspects of admissibility, and technical requirements for its implementation. Main methods and approaches to the issue of identification of IM, concepts of "planned" and "unwanted" IM are analyzed, possible advantages and consequences of the operation of a part of the distribution network in the IM are considered. An analysis and comparison of the legal framework regarding the possibility of IM usage in the countries of the European Union and Ukraine was carried out. Changes to the national legislation regarding the harmonization of regulatory documentation of Ukraine and the European Union, which were caused by Ukraine's desire to integrate its energy system into the European Network of Transmission System Operators for Electricity (ENTSO-E), are presented. The normative and legal documentation of both national and international use, regarding the norms of integration into the distribution networks of sources of distributed generation and their functioning in the IM, is presented and reviewed. Issues related to the technical support of the operation of the IM in the distribution network, subject to compliance with the relevant requirements for power supply quality indicators, are considered. Additionally, analysis of the advantages that distribution networks and consumers have with the possibility of using IM was carried out and the problems that may arise in the event of incorrect planning, identification and technical implementation of the isolated operation of a part of the network with local energy sources were identified. Information has been collected and presented regarding the maximum limits to the frequency and voltage in the distribution network, which are permissible for short-term deviations of these indicators depending on the standard that regulates the operation of the corresponding distribution networks. The importance of taking into account all the previously mentioned aspects of the operation of distribution networks in the IM is summarized, and conclusions are drawn regarding the feasibility of ensuring the possibility of the operation of networks in the specified mode in Ukraine

Satellite Imagery Recording the Process and Pattern of Winter Temperature Field in Yangtze Estuary Interrupted by a Cold Wave

Sea surface temperature (SST) is a key marine ecological metric. An optimized split-window algorithm was used to invert the Yangtze Estuary’s temperature field during a cold wave process. Additionally, MODIS SST inversion results were used to explore the effects of typical cold waves on the Yangtze Estuary’s temperature field through the application of a temperature profile analysis method and a multiscale, multidirectional edge detection algorithm. According to the findings, (1) the cold wave altered the temperature field characteristics and the temperature front intensity, morphology, and spatial distribution pattern within the Yangtze Estuary for a short period. The strong temperature front displayed irregular edges and scattered patterns due to the combined effects of cold water masses produced by the cold wave and the tides and the warm water currents outside the mouth. (2) The cold wave caused significant short-term deviations in the Yangtze Estuary’s SST. The cold water tongue stretched across the entire Yangtze Estuary, where the temperature dropped sharply with time, with the maximum cooling occurring outside the mouth, at 12.2 °C, and the minimum cooling occurring inside the mouth, at only 5.5 °C. (3) The spatially gradual warming of the Yangtze Estuary’s SST from inside to outside the mouth became a low–lower–high pattern during cold waves. (4) The cold wave exhibited a greater influence on the strength, form, and distribution of the temperature front. Studying the effects of cold waves on the Yangtze Estuary’s temperature field has significant theoretical and practical implications for understanding the changes in the winter temperature field, environmental protection, disaster mitigation, and prevention.

ЕКСКУРСИ ГЕОМАГНІТНОГО ПОЛЯ ХРОНУ БРЮНЕС. ЧАСТИНА 1: ІСТОРИЧНИЙ ОГЛЯД ТА СУЧАСНИЙ СТАН ДОСЛІДЖЕНЬ

The use of the palaeomagnetic method in stratigraphy is based on the evidence of geomagnetic field polarity changes (inversions) as well as the existence of excursions, short-term (up to 10 ka) deviations of the virtual geomagnetic pole from its usual position, which occurred sometimes only on a regional scale. The excursions as magnetostratigraphic benchmarks are a powerful tool in the correlation of the Quaternary deposits. In 19601990 particular attention was paid to them as important correlation markers across the regional chronostratigraphic scales of the Quaternary. However, the quantity of the Brunhes chron excursions, their stratigraphic position and ages have been debatable. In recent years, many papers have been published clarifying the nature, age, and duration of excursions in various deposits. In the first part of the article a detailed overview of the Brunhes chron excursions is provided, considering the current state of the issue of determining their suitability.

Stability analysis of the reference standard of <i>Mycoplasma arginini</i> strain G230 used for testing biologicals for mycoplasmas

The State Pharmacopoeia of the Russian Federation (Ph.Rus.) requires a preparatory evaluation of culture medium suitability using the reference standard (RS) of the Mycoplasma arginini G230 test strain in order to ensure reliable results when testing medicines for mycoplasmas using a microbiological (culture) method. The RS retains the stability of physico-chemical properties and the certified characteristic value (titre) for one year if stored under the specified temperature conditions (–20 ºC to –30 ºC). Deviations from this range and transportation in ambient conditions can alter the properties of the RS and consequently result in biologicals substandard in terms of mycoplasmas. Experts from the Reference Materials Committee of the International Organisation for Standardisation (ISO), the State System for Ensuring the Uniformity of Measurements, and the WHO Expert Committee on Biological Standardisation emphasise the need to study the stability of RSs not only under the specified long-term storage conditions, but also with short-term deviations from such conditions. The aim of the study was to analyse the stability of the M. arginini G230 test strain RS under the specified long-term storage conditions and with short-term exposure to elevated temperatures. Materials and methods: the study used the RS of M. arginini G230 by the Scientific Centre for Expert Evaluation of Medicinal Products and culture media and solutions required per the Ph.Rus. general chapter on mycoplasma tests (OFS.1.7.2.0031.15). The stability of RS’s characteristics, including the certified value (titre), was determined using Ph.Rus. methods. The experiment involved two testing regimes with short-term exposure to elevated temperatures. Control samples were stored at –20±2 °С. Statistical data processing was carried out by the serial dilution method using McCrady’s table with the calculation of the arithmetic mean of the most probable number (MPN) for the limiting dilution (titre). Results: as demonstrated in the study under the specified conditions, the RS retains its characteristics for a period exceeding its shelf life (for up to 16 months). The main characteristics of the RS remain stable after 30-day exposure to elevated temperatures (25±2 ºC and 37±2 ºC). The certified value (titre) of the RS decreases after exposure to 37±2 ºC for 10 and 30 days. Conclusions: the study proved the possibility of storing and transporting the RS at a temperature lower than 25±2 ºC for up to 30 days with no subsequent changes to the quality within the 1-year shelf life. The conditions of 37±2 ºC cannot be used for the purpose.