Scientific and Technical Bulletin, Series: Chemistry, Food Science and Engineering

PREMISES FOR SUSTAINABLE ENTREPRENEURIAL DEVELOPMENT OF EASTERN PARTNER COUNTRIES

Simona GAVRILAS — 2025-06-14

Culture and entrepreneurship are complex and interrelated social concepts. The paper aims to
determine the importance of national culture for entrepreneurship progress in the Eastern Partnership (EaP) region. The
article focuses on a meta-analysis of the inputs integrated into a European Union Policy Index. It aimed to underline the
nature of specific interrelation mechanisms of the cultural dimensions that could contribute to developing a performant
entrepreneurial environment. The correlation analysis used in the paper detects the most ”sensitive” pairs of variables
related to national culture and entrepreneurship activities. Results show a highly significant relationship between the
Motivation Towards Achievement and Success index and a large part of the dimensions of the sustainable entrepreneurial
development of EaP countries, especially Internationalization and Support Services for Small and Medium Enterprises
SMEs and start-ups. Another significant relationship is between Individualism and the Development of Entrepreneurial
Activities in the analyzed countries.

PARTICULATE MATTER (PM1, PM2.5, PM10) MONITORING IN INDOOR AND OUTDOOR ENVIRONMENTS AT "AUREL VLAICU" UNIVERSITY OF ARAD, ROMANIA

Dorina Rodica CHAMBRE — 2025-06-14

The presence of particulate matter, along with other specific air pollutants, significantly contributes to the degradation of air quality outdoors and indoors. High concentrations of PM in indoor educational spaces influence students' health and daily performance. This study presents the results of daily monitoring of PM1, PM2.5, and PM10 concentrations carried out between May 9 and May 15, 2024, at 8:00, 10:00, 12:00, 14:00, and 16:00 in various indoor environments of the M University Complex at "Aurel Vlaicu" University of Arad, including two corridors, two student laboratories, and an auditorium, as well as in the outdoor environment.

ASSESSMENT OF SURFACE WATER QUALITY IN JIU VALLEY MINING AREA

Delia Gligor — 2025-06-14

The main objective of the present study was to perform a general screening of surface water quality in Jiu Valley mining rea. Surface waters were collected from West Jiu river and some of its tributaries (Caprisoara creek; Baleia creek; Barbateni creek; Vacii Valley creek; Tusu creek; Bulzu creek) to analyze several general physico-chemical and some specific chemical quality parameters. The general physico-chemical parameters: pH, redox potential (ORP), salinity, total dissolved solids (TDS), electrical conductivity (EC) and dissolved ions were analyzed.
The analyzed water samples had a neutral pH, with a relatively low content of dissolved salts, except for Caprisoara creek. Based on their dissolved ions content, most of the analysed waters correspond to Ist quality class, which reflect a very good ecological status. Because of the high content of sulphate, calcium and magnesium, water sampled from Caprisoara creek corresponds to Vth class (based on SO42- content), IVth class (Ca2+ level) and IIIrd (Mg2+ concen-tration) class, indicating a bad / low / moderate ecological status. The water quality degradation of Caprisoara creek in the investigated area may be associated with several anthropic activities identified in the area, but to confirm this sources further investigations are needed.

BIOSYNTHESIZED GOLD NANOPARTICLES FROM HEDERA HELIX BIOMASS WASTE

Cristian MOISA — 2025-06-14

Hedera helix is an evergreen perennial vine plant often pruned for ornamental or ecological purposes.
This process generates a significant amount of biomass waste. Therefore, this study aimed to use this biomass to obtain
extracts rich in phenolic compounds and as a mediator for the biosynthesis of gold nanoparticles (AuNPs). Biochemical
assays (DPPH, FRAP, Folin–Ciocalteu, and colorimetric determination of total flavonoid content) revealed that the
extracts have significant radical scavenging activity and moderate phenolic and flavonoid compound levels. These
findings were further supported by UHPLC analysis, providing insight into the chemical composition of these extracts.
Only the most efficient extract (water infusion) was further used for AuNPs synthesis in three different synthesis
medium concentrations of HAuCl₄ (0.5, 1, and 2 mM). Visual and UV-Vis spectroscopy analyses revealed the successful
formation of AuNPs, while SEM-EDS analysis confirmed the morphology (spherical and polydisperse nanoparticles)
and elemental composition. The antimicrobial activity was evaluated through the broth microdilution method against
five microbial strains (Staphylococcus aureus, Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa,
and Candida albicans) and two antibiotics (penicillin and gentamicin). The resulting bacterial inhibition rate (BIR%)
revealed a low inhibitory activity for AuNPs, significantly lower than for the tested antibiotics. It suggests that further
AuNPs functionalizations may be required to increase their biological activity

LATEST PROGRESS ON LUMINESCENT HOMO- AND HETEROPOLYMETALLIC METALLOMESOGENS BASED ON d-BLOCK METAL COMPLEXES

Carmen CRETU — 2025-06-14

Luminescent liquid crystalline metal complexes are attractive multifunctional materials due to their great
potential of applicability in a wide range of domains from technological to medical fields. This review is focused on the
luminescent homo– and hetero–polymetallic metallomesogens containing d-block metal ions and different mono and
polydentate ligands published in the last ten years highlighting their ability to self-assembly in ordered lamellar or
columnar phases according to their molecular structure. The luminescent properties in solution, solid and liquid
crystalline states are also discussed

SYNTHESIS, STRUCTURAL AND PHOTOPHYSICAL PROPERTIES OF A NEW DITOPIC TERPYRIDINE-BASED PROLIGAND BEARING DISELENIDE UNITS

Adelina ANDELESCU — 2025-06-14

The present paper describes the synthesis and characterization of a new ditopic proligand with two terpiridines linked by a diselenide unit, obtained by a Steglich esterification procedure between a biscarboxylic acid functionalized with a diselenide unit and 4-([2,2':6',2''-terpyridin]-4'-yl)phenol. The compound was characterized by FT-IR, NMR (1D and 2D) and UV-Vis spectroscopies and ESI-MS analysis. Moreover, the photophysical properties of the ditopic ligand were investigated in freshly prepared dichloromethane solution. The compound was found to be emissive with a maximum centered at 354 nm.