Dynamics of Nucleation in the Ising Model

Reactive pathways to nucleation in a three-dimensional Ising model at 60% of the critical temperature are studied using transition path sampling of single spin flip Monte Carlo dynamics. Analysis of the transition state ensemble (TSE) indicates that the critical nuclei are rough and anisotropic. The TSE, projected onto the free energy surface characterized by cluster size, N, and surface area, S, indicates the significance of other variables in addition to these two traditional reaction coordinates for nucleation. The transmission coefficient along N is ~ 0.35, and this reduction of the transmission coefficient from unity is explained in terms of the stochastic nature of the dynamic model.Comment: In press at the Journal of Physical Chemistry B, 7 pages, 8 figure

Characterization of Trametes versicolor: Medicinal Mushroom with Important Health Benefits

Trametes species represents a rich source of nutritive compounds with important pharmacological properties like antioxidant, antiinflammatory and anti-cancer properties. However, factors like genetic background, harvesting period, geographic location, climatic conditions and others are influencing the biosynthesis of bioactive compounds, their fingerprint and their concentration. The aim of this study was to determine the antioxidant capacity, total phenolic compounds and total flavonoids content of two mushroom species, namely Tramestes versicolor (TV) and Trametes gibbosa (TG), mushrooms with potential health benefits, harvested from north-west part of Romania. In order to determine the phenolic compounds profile, water, methanol, and acetone mushroom extracts were analyzed using UV-Vis spectroscopy, FTIR spectroscopy and LC-MS analysis. In total 28 compounds were tentatively identified as phenolic acids (11 compounds), flavonols (6 compounds), flavones (6 compounds), coumarins (2 compounds), flavanols, isoflavonoids and biflavonoids (1 compound). The highest antioxidant activity was determined for the methanolic extract while the highest total polyphenols content and total flavonoids content were determined for the water extract. The results obtained suggested that Trametes species can be considered important sources of bioactive compounds, their phenolics composition and content being influenced by a series of factors like geographic area origin and genetic background

The use of phytotherapy in hepatocellular carcinoma – a systematic review

Hepatocellular carcinoma (HCC) is one of the most common malignant tumours and the second most frequent cause of cancer-related death worldwide. The aim of this review is to identify whether phytotherapy has an effect over the treatment of HCC or if it is suitable as a combination with chemotherapy. A systematic review was performed in order to offer current information over the use of phytotherapy in HCC. We conducted an electronic search of articles published in English in peer reviewed journals between 2012-2022. After keywords were associated, 302 articles were found. After the exclusion of articles which did not meet the inclusion criteria, there were 77 articles eligible for abstract evaluation. The following were discarded: two case report, one systematic review, 36 in vitro studies and nine studies which discussed other pathologies or with no regard to phytotherapy. The remaining articles encompassed 27 in vivo studies of phytotherapy in hepatocellular carcinoma and two randomized control trials. This selection process is illustrated in the Prisma Flow Diagram. Amongst the evaluated articles, two of them researched the effect of phytotherapy over human subjects in two randomized control trials, while the others illustrated the outcomes of phytotherapy over hepatocellular carcinoma cells and murine specimens. To sum up, phytotherapy has proven its usefulness in hepatocellular carcinoma, especially throughout the following mechanisms: anti-inflammatory effect, suppressing malignant cell proliferation, inhibiting angiogenesis, stimulating apoptosis, and even sensitizing cells to chemotherapy

Health and life quality assessment of patients included in the COVID-19 electronic register

Introduction. COVID-19 infection remains a global medical, economical and societal challenge with clinical and management challenges requiring comprehensive and relevant research. Purpose. Complex assessment of confirmed COVID-19 cases treated in ten medical institutions from Chisinau for the analysis of the health impact of the infection in 2021. Material and methods. The software "Electronic Register of COVID-19 Patients" was developed based on a standardized form. In the register elaboration, the type, quality and scientific value of the information to be collected and stored were taken into account. The collected data included the medical records of COVID-19 patients hospitalized between 1.03.2020 - 30.06.2021. Results. The software was designed with 2 interactive subsystems: the information collection component, implemented in hospital medical institutions and processing component, implemented in USMF „N. Testemitsanu". The egistry included over 8,000 patients with COVID-19, and their number continues to grow. Epidemiological, socio-demographic, clinical, paraclinical data and information on the clinical management of COVID-19 patients are stored securely with different access levels. The created software allows the selection, visualization and statistical analysis of information with generation of different reports according to pre-established or free criteria. Conclusions. The register facilitates research by rapidly processing data on hospitalized COVID-19 patients, is a valuable support for scientific researchers and allows the life quality assessment of the hospitalized patients

Where Should Governments Invest? The Impact of Economic, Political, Social and Technological Factors on the Formation of New Firms

The purpose of this paper is to identify the factors that affect the creation of new firms. We take into consideration economic, political, social and technological factors which should also help governments realize the areas that we found to have the greatest impact. The study relies on data from international organizations from which we construct an ordered probit statistical analysis. The results indicate that investments in both ICT and education enhance the probability of generating new business

Influence of recombinant GABAA receptor subunit composition on the action of allosteric modulators of GABA−gated chloride currents

gamma-Aminobutyric acid (GABA)-activated Cl- currents in neonatal rat cortical neurons and in cultured cells engineered for the expression of specific molecular forms of the GABAA receptor alpha, beta, and gamma subunits, were recorded with the patch-clamp technique in the whole-cell configuration. The effects of various allosteric modulators of GABAA receptors were determined. Diazepam and clonazepam showed greater efficacy as positive modulators of GABA-elicited currents in alpha 2 beta 1 gamma 2 or alpha 3 beta 1 gamma 2 receptors than in alpha 1 beta 1 gamma 2 or alpha 5 beta 1 gamma 2 receptors or in cortical neurons. Alpidem was more efficacious at alpha 1 beta 1 gamma 2 or alpha 2 beta 1 gamma 2 receptors than at alpha 1 beta 1 gamma 2 or alpha 5 beta 1 gamma 2 receptors or in cortical neurons. Conversely, zolpidem was equally efficacious for all these receptors except for alpha 5 beta 1 gamma 2. Both imidazopyridines (alpidem and zolpidem) were virtually ineffective at modulating the GABA response of alpha 5 beta 1 gamma 2 receptors and in almost all the receptors assembled from alpha 1, alpha 2, alpha 3 or alpha 5 subunits together with beta 1 and gamma 1 subunits. The beta-carboline derivatives methyl-6,7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate (DMCM) and methyl-beta-carboline-3-carboxylate (beta-CCM) elicited a positive allosteric modulation of alpha 1 beta 1 gamma 1 or alpha 2 beta 1 gamma 1 receptors, whereas they acted as negative allosteric modulators at nearly all other receptors tested, as they do in cortical neurons. Although the positive allosteric modulation by beta-carbolines never exceeded a doubling of the GABA response, DMCM was more efficacious at alpha 1 beta 1 gamma 1 receptors and beta-CCM was more efficacious at alpha 2 beta 1 gamma 1 receptors. DMCM was inactive at alpha 3 beta 1 gamma 1 receptors, whereas beta-CCM was virtually inactive at alpha 5 beta 1 gamma 1 receptors. The benzodiazepine 4'-chlorodiazepam, which is a negative modulator resistent to flumazenil inhibition, acted at all the various GABAA receptors that contained a gamma subunit

Triazolam is more efficacious than diazepam in a broad spectrum of recombinant GABAA receptors

Benzodiazepine-induced modifications of GABA (γ-aminobutyric acid) activated Cl- currents were studied in native GABAA receptors expressed in neonatal rat brain cortical neurons in primary cultures and in recombinant GABAA receptors expressed in transformed human embryonic kidney cells (293) after a transient transfection with cDNAs encoding for different molecular forms of α, β, and γ subunits of GABAA receptors. The efficacy of triazolam in cortical neurons was higher than that of diazepam. In transfected cells, triazolam showed a greater efficacy as a positive modulator of GABA-elicited Cl- currents in α1β1γ1, α1β1γ2, α1β1γ3, α6β1γ2 and α1β3γ2 receptors than diazepam, except in α3β1γ2 receptors where diazepam was more efficacious. When triazolam and diazepam were applied together to GABAA receptors assembled by transfecting cDNAs encoding for α1β1γ1 subunits, the action of triazolam was curtailed in a manner related to the dose of diazepam. In recombinant receptors assembled with α1β1γ1 receptors, maximally active doses of triazolam were more efficacious than those of clonazepam, alpidem, zolpidem, diazepam or bretazenil. © 1993