Arhivă — Seria B

1

SEMI-INTERPENETRATING HYDROGELS BASED ON CHITOSAN, VINYL BENZYL TRIMETHYLAMMONIUM CHLORIDE, AND POLY (ETHYLENE GLYCOL) DIACRYLATE WITH ANTIBACTERIAL PROPERTIES FOR WASTEWATER TREATMENT

Iulia Elena NEBLEA, Tanta-Verona IORDACHE, Ana-Mihaela GAVRILA, Anita-Laura CHIRIAC, Andreea MIRON, Celina Maria DAMIAN, Andreea OLARU, Mircea TEODORESCU

The present study investigates the role of source-dependent chitosan in shaping the structural and functional properties of some semi-interpenetrating (semi- IPN) hydrogels for wastewater treatment. Novel hydrogels were synthesized via freeradical polymerization using vinyl benzyl trimethylammonium chloride as the func…

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2

POLYSACCHARIDIC-POLYDOPAMINE BEADS TOWARDS NEXT-GENERATION OF CELL ENCAPSULATION: A COMPOSITIONAL STUDY

Andreea Ioana DINU, Maria-Ruxandra SMARANDI, Cristina STAVARACHE, Alexandra MOCANU-DOBRANICI, Sorina DINESCU, Adriana LUNGU, Elena OLAREȚ, Horia IOVU

Investigating the optimal formulation for polysaccharidic–polydopamine beads is essential to improving cell encapsulation technologies because it directly affects key attributes including porosity, surface bioactivity, crosslinking density, and degradation rate. While polydopamine (PDA) adds adhesive and functional gro…

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3

SYNTHESIS, STRUCTURAL EVOLUTION AND IN VITRO BIOACTIVITY OF MAGNETITE-DOPED BIOACTIVE GLASS

Marian RAȘCOV, Angela SPOIALĂ, Ludmila MOTELICA, Roxana Doina TRUȘCĂ, Otilia-Ruxandra RĂDĂCINĂ, Cristina CHIRCOV, Vasile-Adrian SURDU, Denisa FICAI, Ovidiu-Cristian OPREA, Anton FICAI, Ecaterina ANDRONESCU, Claudiu-Ștefan TURCULEȚ

A bioactive glass with the composition of 25SiO₂-33CaO-33Na₂O-3.5P₂O₅- 5.5Fe₃O₄ mol % was synthesized through the sol-gel method. The Fe₃O₄-containing bioactive glass was investigated by TG–DSC, XRD, SEM/EDS, FTIR and DLS analyses. After calcination at 350 °C, the material remained mainly amorphous. Weak crystalline co…

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4

BATCH CHROMATOGRAPHY USING CAPTO CORE 700 FOR INFLUENZA VIRUS PURIFICATION

Anca-Teodora MORARU, Alina MIHALCEA, Cătălin ŢUCUREANU, Andreea STOIAN, Ana ŞERBĂNESCU, Alina MINEA, Alexandra CĂPRARU, Monica CÎRSTOIU, Adriana COSTACHE, Graţiela TIHAN, Monica IONESCU, Crina STĂVARU, Adrian ONU, Camelia UNGUREANU

Vaccination is the most effective protective measure against aggressive forms of influenza virus infections. The most common technology to is the one that uses embryonated chicken eggs for viral multiplication, despite it’s drawbacks, like the ovalbumin content, which poses a risk for allergic reactions. Therefore, ova…

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5

VEGETABLE OILS FUNCTIONALIZATION WITH CARBOXYLIC ACIDS: A COMPARATIVE STUDY ON THEIR REACTIVITY

Laura MIU, Andrei-Iulian SLABU, Emilian GHIBU, Cristina-Elena STAVARACHE, Cristian Aurelian BOSCORNEA, Florina TEODORESCU, Raluca STAN

Vegetable oils are valuable renewable raw materials due to their versatility and tunable fatty acid composition, which influences key properties such as color, stability, and functionality. This study explores the epoxidation and subsequent ringopening reactions of three unsaturated oils (sunflower, safflower and sesam…

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6

HYDROGELS FOR CONTROLLED RELEASE OF ATROPINE IN CHEMICAL WARFARE AGENTS THREAT SCENARIOS

Adriana-Elena BRATU, Izabela-Cristina STANCU, Aurel DIACON, Gabriela TOADER, Ana Mihaela GAVRILA, Raluca Elena GINGHINA, Sebastian Stefan PRICOP, Tudor-Viorel TIGANESCU

The influence of various functional additives (halloysite, β- and γ- cyclodextrins, TiO₂) on the properties and drug release behavior of photopolymerized semi-interpenetrating polymer network (sIPN)-PVA-based hydrogels was investigated. The sIPN hydrogels were characterized by SEM, FT-IR, mechanical tests (tensile, com…

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7

VALORIZATION OF NORTHERN PIKE (ESOX LUCIUS) SKIN FOR COLLAGEN HYDROGELS: EXTRACTION AND CHARACTERIZATION WITH POTENTIAL APPLICATION IN WOUND HEALING

Elena DĂNILĂ, Mădălina Georgiana ALBU KAYA, Minodora Maria MARIN, Ana Maria ROSCA, Rodica Roxana CONSTANTINESCU, Irina TITORENCU

The aim of this study was to obtain and characterize fish collagen hydrogels from Northern Pike with potential application in skin wound healing. The fish collagen hydrogels were obtained by a series of processes including acid, alkaline and alcohol treatment. The characterization of hydrogels and their freeze-dried fo…

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8

MOLECULAR DOCKING APPROACH TO INHIBIT CYSTEINE DESULFURASE SufS FROM S. AUREUS

Amalia ȘTEFANIU, Mișu MOSCOVICI, Virginia VULTURESCU, Dana-Maria MIU

This study presents a molecular docking approach to identify potential inhibitors of cysteine desulfurase SufS, a key enzyme in the Fe–S cluster biogenesis pathway of Staphylococcus aureus. Bidentate and tridentate ligands were evaluated using molecular docking simulations for their binding affinity to the active bindi…

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9

DESIGN AND PREPARATION OF ULTRA-THIN CARBON FIBER REINFORCED POLYETHER ETHER KETONE COMPOSITE FOLDABLE HINGES

Zhiyang SONG, Mengkai LI, Chao QIU, Lipeng WANG, Wenlan BA, Shijie ZHU, Haihong WU

To overcome the limitations of thermally driven shape memory composites in practical applications, this study prepared carbon fiber reinforced polyether ether ketone (CF/PEEK) shape memory composites and designed the layup of the electrically driven hinge and the conductive layer materials. The infrared thermal imaging…

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10

THE INFLUENCE OF ELECTROCHEMICAL SYNTHESIS TIME ON THE PHOTOCATALYTIC PERFORMANCE OF Ag- TiO2 COMPOSITE UNDER UV IRRADIATION

Ionela-Cristina PETCU, Ana T.S.C. BRANDÃO, Cosmin ROMANITAN, Oana BRINCOVEANU, Adina BOLDEIU, Iuliana MIHALACHE, Lucia Monica VECA, Carlos M. PEREIRA, Liana ANICAI, Cristina BUSUIOC, Sabrina STATE

This research demonstrates that the time of the green electrochemical synthesis influences the photodegradation efficiency of Ag-TiO2. While a 3h duration was previously identified as optimal, this work evaluates the composite synthesized for 5h (Ag-TiO2-5h). According to XRD and SEM analysis, the composite exhibited a…

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11

HYBRID MATERIALS BASED ON MODIFIED PECTIN AND HALLOYSITE FOR 3D PRINTING

Mădălina-Cristina NICOLAE, Sorina-Alexandra GÂREA, George-Mihail VLĂSCEANU, Cristina-Elena STAVARACHE, Celina-Maria DAMIAN, Horia IOVU

The aim of the present study is to develop a new bioink based on modified pectin and halloysite. For this purpose, different compositions of modified pectin with various halloysite concentrations (1 and 3 wt.%) were tested. NMR results confirmed modification of pectin. Rheological study highlighted the influence of hal…

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12

CULTURE MEDIA SCREENING FOR CAROTENOID PRODUCTION BY RHODOTORULA RUBRA ICCF 220 PRIOR TO BIOREACTOR SCALE-UP

Vlad-Iulian CHELMUȘ, Teodora MORARU, Alina MIHALCEA, Roxana Gabriela ZGÂRIAN, Camelia UNGUREANU

Optimizing culture media is essential for improving the biosynthesis of carotenoid pigments produced by Rhodotorula rubra ICCF 220. In this study, the yeast was grown in two media with different carbon–nitrogen balances to observe how nutrient composition influences growth and pigment formation. Cultures were monitored…

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13

STUDY ON THE PERFORMANCE OF RICE STRAW ASH CONCRETE IN LOW-TEMPERATURE ENVIRONMENTS

Fucheng WANG, Heng KANG, Pengyue XING, Jiabing TIAN, Guoliang XIE, Xinrong ZHAO

Concrete specimens were made by replacing 0%-20% cement with equal-mass rice straw ash (RSA). They underwent 50, 100, and 150 freeze-thaw (F-T) cycles to test frost resistance, with observations, mass compressive strength analysis, and finite element temperature stress simulation. Results: RSA concrete fills pores via …

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14

DESIGN AND OPTIMIZATION OF A SYNERGISTIC NANOPARTICLE DELIVERY SYSTEM COMBINING CHEMODYNAMIC THERAPY AND PHOTOTHERMAL THERAPY

Weiwei CHENG

In response to the endogenous H2O2 deficiency in the tumor microenvironment and limited efficacy of single-mode therapy, a nanomedicine delivery system combining chemodynamic therapy and photothermal therapy is designed. The in vitro test results showed that the system had significant photothermal performance. Under 80…

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15

CORRELATION BETWEEN STRUCTURE AND PROPERTIES OF A TOOL STEEL USED IN SURGICAL INSTRUMENTS

Daniela Alina NECȘULESCU, Aurora ANTONIAC, Răzvan Ionuț POPESCU, Mariana CIURDAȘ, Alexandru STREZA, Anca Maria FRĂȚILĂ

Medical instruments represent the set of devices, equipment and tools used by medical professionals to ensure effective and safe patient care. It includes both surgical instruments and diagnostic equipment. All these instruments are designed with precision and subject to strict quality controls, to meet the high standa…

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16

INFLUENCE OF ALLOYING ELEMENTS ON MICROSTRUCTURE OF Fe-Cr-Al ALLOY

Adrian Emanuel ONICI, Alexandra Mihaela TUDOR, Ionelia VOICULESCU, Radu STEFANOIU, Victor GEANTA

The paper presents some experimental alloys from the Fe-Cr-Al class alloyed with Zr and Y, that have been obtained using a VAR equipment MRF ABJ 900. The samples were subjected to laser irradiation and severe test conditions, i.e. long-term maintenance in a molten lead environment (6 months), and then they were exposed…

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17

INCREASING THE WORKING SPEED DURING WIRE DRAWING BY ULTRASONIC ACTIVATION OF THE DIE

Dan NITOI, Anda CRINGUREANU, Oana CHIVU, Mihalache GHINEA, Dragos MARCU, Bogdan FLOREA, Cosmin Alexandru NICULESCU, Vasilica MUSTATA

The basic process investigated in this research is that of obtaining wires by wire-drawing technology, which consists of successively passing a semi-finished wire through a sequence of dies until the desired final diameter is obtained. The phenomena that can still be studied in this process and improved is that of redu…

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18

THE INFLUENCE OF AGING HEAT TREATMENTS ON THE STRUCTURAL AND MECHANICAL CHARACTERISTICS OF ALUMINUM ALLOY 2017A

Andreea Daniela BUZATU, Ion-Daniel DIȚOIU, Laura Nicoleta ENARU, Brândușa GHIBAN

This paper investigates the influence of different thermal aging treatments on the structural and mechanical characteristics of the 2017A aluminum alloy. Three types of treatments are applied, at 120ºC, 140°C and 190°C, with holding times at each temperature of 1 hour, 12 hours and 24 hours, respectively. A structural …

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19

DIGITAL LIGHT PROCESSING 3D PRINTING OF CERAMIC-RESIN COMPOSITE MATERIALS

Bianca-Andreea OLTEANU, Ciprian PREDA, Maria-Felicia DONDEA, Daniela MANOLE, Aura-Cătălina MOCANU, Florin MICULESCU

This paper presents an innovative methodology for manufacturing customized osteosynthesis screws via Digital Light Processing (DLP) 3D printing, utilizing acomposite material based on a photopolymerizable resin and hydroxyapatite (HA). A key novelty is the exclusive use of naturally derived bioceramics, successfully in…

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20

SUSTAINABLE PRODUCT DESIGN USING BIO-BASED MATERIALS: A COMPARATIVE ANALYSIS BETWEEN PLA AND WOOD COMPOSITES

Augustin SEMENESCU, Elena-Cristina UDREA, Alexandru-Dorian FĂINĂ, Maria-Alexandra MIELCIOIU, Mihai Ioan CIOBANU, Gabriela BREZEANU

This paper investigates the potential of bio-based materials in sustainable product design through a comparative analysis between standard PLA and woodbased composite materials. Experimental evaluations were conducted using hardness (Shore D) and surface roughness measurements to assess mechanical performance. The resu…

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21

THE INFLUENCE OF WASHING PROCESS OF SOME SYNTHETIC KNITTED FABRICS FOR SPORTSWEAR ON MICROFIBERS SHEDDING

Florin-Aurel DINCĂ, Alexandra Gabriela STANCU, Doina TOMA, Carmen GAIDĂU, Ecaterina MATEI, Maria RÂPĂ

The washing process is a primary contributor to microplastic pollution, with synthetic sport textiles releasing thousands of microfibers per garment in every wash cycle. The purpose of this paper is to detect the microfibers (MFs) released from some knitted fabrics in sportswear after subjected to washing process with …

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22

EFFECT OF HYDROTHERMAL TREATMENT ON SOME PROPERTIES OF SPENT COFFEE GROUND

Ramona-Eugenia POPESCU, Corina Violeta CHIRIȚĂ, Ecaterina MATEI, Tatiana BUSE, Marcela POPA, Mihai NIȚĂ-LAZĂR, Mariana Mirela STĂNESCU, Maria RÂPĂ

This study investigates the effect of hydrothermal carbonization (HTC) process on the properties of liquid extracts resulted from spent coffee ground processing. Two samples, coded HTC-LE I and HTC-LE II were obtained by HTC at 220 °C, the ratio between biomass and distilled water of 1:10, generated autogenic pressure,…

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23

THERMODYNAMIC BEHAVIOUR OF A COPPER- GERMANIUM-SILICON SOLDER ALLOY

Florentina NICULESCU, Gheorghe IACOB, Mirela STĂNESCU, Constantin - Domenic STĂNCEL, Robert POPESCU

The thermodynamic behaviour of a Cu-80 at.%, Ge-17 at.%, Si-3 at.% solder alloy was investigated at 1200 K. Germanium activity, determined experimentally via the electromotive force (EMF) method, showed pronounced negative deviations from Raoult's law, indicating strong attractive liquid-phase interactions. Silicon act…

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24

MULTIPLE QUENCHING SOLID SOLUTION INFLUENCE ON THE MECHANICAL AND STRUCTURAL CHARACTERISTICS OF 7175 ALUMINUM ALLOY SHEETS

Ion-Daniel DIȚOIU, Brânduṣa GHIBAN, Laura Nicoleta NEDELOIU, Alexandru STREZA

This paper presents the results of industrial testing conducted on 7175 type aluminum alloy. The study focused on how the application of multiple solution heat treatments influences the potential improvement of mechanical properties. Test specimens in the form of plates with thicknesses of 15mm and 100mm were used. Suc…

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