Rǎzvan Ştefan

ORCID: 0000-0002-2728-7414
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About
Contact & Profiles
Research Areas
  • Glass properties and applications
  • Luminescence Properties of Advanced Materials
  • Bone Tissue Engineering Materials
  • Effects of Environmental Stressors on Livestock
  • Catalysis and Oxidation Reactions
  • Phase-change materials and chalcogenides
  • Spectroscopy Techniques in Biomedical and Chemical Research
  • Nuclear materials and radiation effects
  • Odor and Emission Control Technologies
  • Phytochemistry and Biological Activities
  • Milk Quality and Mastitis in Dairy Cows
  • Genetic and phenotypic traits in livestock
  • Pigment Synthesis and Properties
  • Dental Implant Techniques and Outcomes
  • Livestock Management and Performance Improvement
  • Lanthanide and Transition Metal Complexes
  • Advanced Nanomaterials in Catalysis
  • Mineralogy and Gemology Studies
  • Indoor Air Quality and Microbial Exposure
  • Phytochemicals and Antioxidant Activities
  • Dental materials and restorations
  • Animal Behavior and Welfare Studies
  • Advanced Glycation End Products research
  • Chemical Synthesis and Characterization
  • Orthopaedic implants and arthroplasty

University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca
2015-2024

Carol Davila University of Medicine and Pharmacy
2024

University of Agricultural Sciences, Dharwad
2007-2022

Stuttgart Observatory
2022

TU Dresden
2022

Spitalul Clinic Județean de Urgență Cluj-Napoca
2016

"Ion Ionescu de la Brad" Iasi University of Life Sciences
2015

Babeș-Bolyai University
2000-2001

Missouri University of Science and Technology
2001

The Graduate Center, CUNY
2001

Plasticized poly(lactic acid) (PLA) samples with embedded Cu-doped ZnO powder functionalized Ag nanoparticles composites were prepared by melt blending processing technique.The effect of ZnO:Cu/Ag on the properties plasticized PLA was investigated in terms structural (by Attenuated total reflectance -Fourier Transform Infrared -ATR-FT-IR, X-Ray Diffraction analysis -XRD) and morphological (using Scanning Electron Microscopy -SEM Transmission -TEM examination) modifications, thermal...

10.3144/expresspolymlett.2017.51 article EN publisher-specific-oa eXPRESS Polymer Letters 2017-01-01

Plant fibers are sustainable sources of materials for many industries, and can be obtained from a variety plants. Cellulose is the main constituent plant-based fibers, its properties give characteristics obtained. Detailed characterization cellulosic often performed after lengthy extraction procedures, while fast screening might bring benefit quick qualitative assessment unprocessed stems. The aim this research was to define some marker spectral regions that could serve fast, preliminary...

10.3390/app11188570 article EN cc-by Applied Sciences 2021-09-15

The modication of local polymeric conformation poly(acrylic) acid (PAA), induced by hydration and neutralization with triethanol amine (TEA), was investigated IR Raman spectroscopy.The eect water is the perturbation hydrogen bonds established between dierent chains polymer.The TEA aects carboxylic groups modies polymer.These modications are correlated shift characteristics spectra.

10.12693/aphyspola.128.128 article EN cc-by Acta Physica Polonica A 2015-07-01

The aim of this study was to assess the effect housing systems (loose vs tie-stall) on welfare dairy cows and test hypothesis that in loose have a better quality than those kept tie-stalls. Sixty commercial farms (30 with 30 tie-stall system) were selected for evaluation, using mainly animal-based measures, as applied Welfare Quality® protocol allows it. A total number 2624 milking assessed winter period. There significant differences between two majority parameters within four principles....

10.4081/ijas.2014.2940 article EN cc-by-nc Italian Journal of Animal Science 2014-01-01

The efficiency of 60SiO<sub>2</sub>·(32 −<italic>x</italic>) CaO·8P<sub>2</sub>O<sub>5</sub>·<italic>x</italic>CuO (mol%) glass-ceramics were proved, and was determined the most appropriate composition for further<italic>in vivo</italic>trials.

10.1039/c6bm00270f article EN Biomaterials Science 2016-01-01

Infrared and Raman spectroscopic measurements were performed in order to investigate the 90%[xB2O3(1 − x)Bi2O3]10%MO glasses structure, where MO = Fe2O3 V2O5, with different Bi/B nominal ratios (0.07⩽x⩽0.625) obtain valuable information about competitive role of component oxides formation glass network. The individual influence V2O5 on B2O3 Bi2O3 structures local changes around constituent cations studied, revealing significant structural modifications that occur when replaces Fe2O3....

10.1002/jrs.1306 article EN Journal of Raman Spectroscopy 2005-01-01

In this study, we have investigated calcium and silicate‐free samples over a wide compositional range in the xB 2 O 3 ·30 Na O·(70−x)P 5 system, with 0 ≤ x 70 mol%, order to determine influence of chemical composition on their structure bioactive response simulated body fluid. Information related structures present network was obtained by means Raman infrared spectroscopy. For containing small amounts P , boron are preponderant. Upon increasing phosphorus content, samples' is based phosphate...

10.1002/jrs.4330 article EN Journal of Raman Spectroscopy 2013-07-08

Syringa vulgaris L. (common lilac) is one of the most popular ornamental species, but also a promising not comprehensively studied source bioactive compounds with important therapeutic potential. Our study was designed to characterize chemical composition and assess antioxidant cytotoxic properties ethanolic extracts obtained from S. flowers, leaves, bark, fruit. The profile investigated using chromatographic (HPLC-DAD-ESI+, GC-MS) spectral (UV-Vis, FT-IR) methods, while protective effect...

10.3390/molecules26113104 article EN cc-by Molecules 2021-05-22

Fourier Transform Infrared Spectroscopy (FT-IR) and High-Performance Liquid Chromatography (HPLC) could be applied to study the provenance of wood, specifically differentiation wood resources, as well identification chemical compounds that are connected changes occur in a result drying treatments. To test this hypothesis, bark silver fir (

10.1016/j.heliyon.2024.e26820 article EN cc-by Heliyon 2024-02-27

Essential oils are a category of agro-based industrial products experiencing increasing demand. In this research, three essential obtained by steam distillation from lavender, sage and basil plants cultivated in temperate continental conditions Transylvania were investigated for chemical composition, physical characteristics biological activity (antimicrobial cytotoxic effect on cancer cell lines). The number identified compounds varied: 38 29 oil 41 basil. volatile profile was dominated...

10.3390/metabo12100962 article EN cc-by Metabolites 2022-10-11
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