A5080112870- Near-Field Optical Microscopy
- Advanced Fluorescence Microscopy Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum Dots Synthesis And Properties
- Solid State Laser Technologies
- Image Processing Techniques and Applications
- Luminescence Properties of Advanced Materials
- Photoacoustic and Ultrasonic Imaging
- Cell Image Analysis Techniques
- Bone Tissue Engineering Materials
- Optical Coherence Tomography Applications
- Force Microscopy Techniques and Applications
- Glass properties and applications
- Photorefractive and Nonlinear Optics
- Lipid Membrane Structure and Behavior
- Crystal Structures and Properties
- Plasmonic and Surface Plasmon Research
- Dental materials and restorations
- Analytical Chemistry and Sensors
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photonic and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Advanced Semiconductor Detectors and Materials
- Essential Oils and Antimicrobial Activity
- Chalcogenide Semiconductor Thin Films
Universitatea Națională de Știință și Tehnologie Politehnica București
2016-2025
University of Science and Technology
2024
National Institute for Laser Plasma and Radiation Physics
2014-2024
University of Bucharest
1982-2023
Ovidius University
2008-2014
Gheorghe Asachi Technical University of Iași
2014
Tezpur University
2009
A wide palette of nanoscale imaging techniques operating in the near-field regime has been reported to date, enabling an important number scientific breakthroughs. While tuning and benchmarking microscopes represent a very step for optimizing outputs sessions, no generally acknowledged standards exist yet terms calibration microscopes, which would play role fully exploiting potential these instruments. With this work, we aim contribute filling gap, by introducing prototypical sample, that...
Three incongruent melting LawNdxGdyYzSc4–w–x–y–z(BO3)4 (LGYSB:Nd) crystals with different Y concentrations (z = 0.15, 0.05, and 0.025) have been grown by the Czochralski method for first time. The LGYSB:Nd-type exhibit an acentric structure similar to that of natural mineral huntite CaMg3(CO3)4, space group R32. composition LGYSB:Nd_3 crystal from starting melt La0.628Gd0.547Y0.025Nd0.05Sc2.75(BO3)4 was measured inductively coupled plasma mass spectrometry method, it found be...
The accurate staging of liver fibrosis is paramount importance to determine the state disease progression, therapy responses and optimize treatment strategies. Non-linear optical microscopy techniques such as two-photon excitation fluorescence (TPEF) second harmonic generation (SHG) can image endogenous signals tissue structures be used for assessment on non-stained samples. While analysis collagen in SHG images was consistently addressed until now, cellular information included TPEF images,...
Biofilms formed by bacterial cells are associated with drastically enhanced resistance against most antimicrobial agents, contributing to the persistence and chronicization of microbial infections therapy failure. The purpose this study was combine unique properties magnetic nanoparticles activity three essential oils obtain novel nanobiosystems that could be used as coatings for catheter pieces an improved Staphylococcus aureus Klebsiella pneumoniae clinical strains adherence biofilm...
The scattering-type Scanning Near-Field Optical Microscope (s-SNOM) is acknowledged as an excellent tool to investigate the optical properties of different materials and biological samples at nanoscale. In this study we show that s-SNOM data are susceptible being affected by specific artefacts related light diffraction phenomena stray contributions from shallow buried, contrast-active, structures. We focus on discussing sample edges, next those corresponding one- or two-dimensional periodic...
Background/Objectives: This study explores the micro-structure of celiac ganglia using two-photon microscopy (TPM) to highlight histological features in neurodegenerative conditions. Neurodegenerative diseases like Parkinson’s disease (PD) are linked dysautonomia, impacting autonomic regulation and leading significant gastrointestinal symptoms. Our research compares imaging results from TPM SHG microscopy, visualizing neuronal integrity, collagen distribution, architectural organization...
Milk products are a very important human nutrient since their consumption has increased in recent years.Good quality measurements essential to control and maintain milk processes quality, both manufacturing, trade research.The presence of toxic elements powdered liquid may create significant health problems for people.The aim this paper was determine the content major minor different samples, sold supermarket chains Romania.Inductively coupled plasma atomic emission spectrometry (ICP-AES)...
Undesired biofilm development is a major concern in many areas, especially the medical field. The purpose of present study was to comparatively investigate antibiofilm efficacy usnic acid, soluble versus nanofluid formulation, order highlight potential use Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> /oleic acid (FeOA) as controlled release vehicle this agent. (+) -UA loaded into...
Imaging tissue samples by polarization‐resolved second harmonic generation microscopy provides both qualitative and quantitative insights into collagen organization in a label‐free manner. Polarization‐resolved goes beyond simple intensity‐based imaging adding the laser beam polarization component applying different metrics such as anisotropy factor. It thus valuable information on arrangement not available with intensity measurements alone. Current established approaches are limited to...
The goal of this study was the preparation, physicochemical characterization, and microbiological evaluation novel hydroxyapatite doped with silver/polydimethylsiloxane (Ag:HAp-PDMS) composite layers. In first stage, deposition polydimethylsiloxane (PDMS) polymer layer on commercially pure Si disks has been produced in atmospheric pressure corona discharges. Finally, new silver hydroxyapatite/polydimethylsiloxane obtained by thermal evaporation technique. Ag:HAp-PDMS layers were...
Quantitative second harmonic generation microscopy was used to investigate collagen organization in the fibrillar capsules of human benign and malignant thyroid nodules. We demonstrate that combination texture analysis images can be differentiate between surrounding follicular adenoma papillary carcinoma Our findings indicate provide quantitative information about collagenous capsule both nodules, which may complement traditional histopathological examination.
Scattering-type scanning near-field optical microscopy (s-SNOM) has emerged over the past years as a powerful characterization tool that can probe important properties of advanced materials and biological samples in label-free manner, with spatial resolutions lying nanoscale realm. In this work, we explore such usefulness relationship an interesting class materials: polymer-coated gold nanoparticles (NPs). As thoroughly discussed recent works, interplay between Au core polymeric shell been...
In the present study, we report development and characterization of composite layers (by spin coating) based on magnesium-doped hydroxyapatite in a chitosan matrix, (Ca10-xMgx(PO4)6(OH)2; xMg = 0, 0.08 0.3; HApCh, 8MgHApCh 30MgHApCh). The MgHApCh were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), photoelectron (XPS) techniques. vitro biological evaluation included assessment their cytotoxicity MG63 osteoblast-like cells antifungal activity...
Second Harmonic Generation Microscopy (SHG) is generally acknowledged as a powerful tool for the label-free 3D visualization of tissues and advanced materials, with one its most popular applications being collagen imaging. Although great need, progress in super-resolved SHG imaging lags behind developments reported over past years fluorescence-based optical nanoscopy. In this work, we quantitatively show on collagenous that by combining re-scan microscopy resolutions surpass diffraction...
The aim of the present study was to demonstrate that Fe(3)O(4)/oleic acid core/shell nanostructures could be used as systems for stabilizing Eugenia carryophyllata essential oil (EO) on catheter surface pellicles, in order improve their resistance fungal colonization. EO microwave assisted extraction performed a Neo-Clevenger (related) device and its chemical composition settled by GC-MS analysis. acid-core/shell nanoparticles (NP) were obtained precipitation method under condition. High...
Beer is one of the oldest known alcoholic beverages produced by a yeast fermentation cereal extract that was germinated in water beforehand. The bitter taste beer comes from group substances introduced during wort boiling, which are extracted components hops. aim this study to determine some characteristics (original extract, alcohol content, colour, pH, total acidity, carbon dioxide and bitterness values) three stages production process typical Romanian brewery. Measurements were carried...
Second Harmonic Generation Microscopy (SHG) is widely acknowledged as a valuable non-linear optical imaging tool, its contrast mechanism providing the premises to non-invasively identify, characterize, and monitor changes in collagen architecture of tissues. However, interpretation SHG data can pose difficulties even for experts histopathologists, which represents bottleneck translation SHG-based diagnostic frameworks clinical settings. The use artificial intelligence methods automated...
Infectious diseases are acknowledged as one of the leading causes death worldwide. Statistics show that annual toll caused by bacterial infections has reached 14 million, most which drug-resistant strains. Bacterial antibiotic resistance is currently regarded a compelling problem with dire consequences, motivates urgent identification alternative ways fighting bacteria. Various types nanomaterials have been reported to date efficient antibacterial solutions. Among these, carbon-based...