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Exploring the asymmetric effect of COVID‑19 pandemic news on the cryptocurrency market:evidence from nonlinear autoregressive distributed lag approach and frequency domain causality

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Financial Innovation 2023年第1期9卷 692-749页

作者： Ştefan Cristian Gherghina liliana nicoleta simionescu Department of Finance Bucharest University of Economic Studies6 Romana Square010374 BucharestRomania

This paper explores the asymmetric effect of COVID-19 pandemic news,as measured by the coronavirus indices(Panic,Hype,Fake News,Sentiment,Infodemic,and Media Coverage),on the cryptocurrency market.Using daily data from January 2020 to September 2021 and the exponential generalized autoregressive conditional heter-oskedasticity model,the results revealed that both adverse and optimistic news had the same effect on Bitcoin returns,indicating fear of missing out behavior does not prevail.Furthermore,when the nonlinear autoregressive distributed lag model is esti-mated,both positive and negative shocks in pandemic indices promote Bitcoin’s daily changes;thus,Bitcoin is resistant to the SARS-CoV-2 pandemic crisis and may serve as a hedge during market turmoil.The analysis of frequency domain causality supports a unidirectional causality running from the Coronavirus Fake News Index and Sentiment Index to Bitcoin returns,whereas daily fluctuations in the Bitcoin price Granger affect the Coronavirus Panic Index and the Hype Index.These findings may have significant policy implications for investors and governments because they highlight the impor-tance of news during turbulent times.The empirical results indicate that pandemic news could significantly influence Bitcoin’s price.

关键词： COVID-19 Bitcoin NARDL EGARCH Frequency domain causality

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Does board gender diversity affect firm performance?Empirical evidence from Standard & Poor’s 500 Information Technology Sector

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Financial Innovation 2021年第1期7卷 1124-1168页

作者： liliana nicoleta simionescu Ştefan Cristian Gherghina Hiba Tawil Ziad Sheikha Department of Finance Bucharest University of Economic Studies6 Romana Square010374 BucharestRomania

The essence of this study is to investigate the influence of the board gender diversity on firms’accounting and market-based performance using a sample of Standard&Poor’s 500 companies belonging to the information technology sector over 12 years.Using the pooled ordinary least squares(OLS)method,the outcomes provide evidence for a positive influence of women on corporate boards on both measures of company performance,except for the percentage of female executives in the case of return on assets(ROA).After estimating the fixed effects and random-effects through panel data,the econometric outcomes show no statistically significant association among board gender diversity and ROA but a positive influence of the number and percentage of women on board on price-to-earnings ratio.

关键词： Gender diversity Firm performance Pooled OLS Fixed-effects Randomeffects

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Circulating microparticles and micro RNAs as players in atherosclerosis

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World Journal of Hematology 2013年第2期2卷 16-19页

作者： nicoleta Alexandru Adriana Georgescu Petru Poni Institute of Macromolecular Chemistry R-6600 Iasi Romania Department of Pathophysiology and Pharmacology Institute of Cellular Biology and Pathology Nicolae Simionescu of Romanian Academy 050568 Bucharest Romania

Microparticles(MPs) are extracellular membrane vesicles released from normal, apoptotic and pathological cells following a process of detachment from cells of origin. MPs are typically defined by their size, exposure of phosphatidylserine, the expression of surface antigens, proteins and genetic material, originating from their donor cells, and as important vehicles of intercellular communication across numerous biological processes. MPs contain the major source of systemic RNA including micro RNA(mi RNA) of which aberrant expression appears to be associated with stage and progression of atherosclerosis. The involvement and influence of mi RNA during the onset and progression of atherosclerotic disease have generated a lot of inter-est in assessing the feasibility of therapeutic regulation of mi RNAs to manipulate them with a special focus on cardiovascular disease. We speculate on the future de velopments of MPs which contain mi RNA as new thera peutic targets for proliferative vascular diseases such as atherosclerosis.

关键词： Microparticles MicroRNA Atherosclerosis

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