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Elfrida M. Carstea

Elfrida M. Carstea
National Institute of R&D for Optoelectronics, INOE2000 · Constructive and Technological Engineering

PhD

About

57
Publications
12,791
Reads
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1,090
Citations
Citations since 2016
17 Research Items
875 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Additional affiliations
November 2013 - October 2015
University of Birmingham
Position
  • Marie Curie Research Fellow
September 2006 - present
National Institute of R&D for Optoelectronics, INOE2000
Position
  • Researcher
Education
October 2007 - November 2010
University of Bucharest
Field of study
  • Biophysics
October 2005 - October 2007
University of Bucharest
Field of study
  • Neurobiology
October 2001 - July 2005
University of Bucharest
Field of study
  • Biophysics

Publications

Publications (57)
Article
Full-text available
In recent years, citizen science has proven to be an effective means of monitoring plastic litter, bring potential benefits to professional researchers and authorities, and create awareness on plastic pollution at a society level. This paper aims to review the advances of employing the citizen science approach for plastic litter evaluation and expl...
Chapter
Human changes on the Danube River have transformed it into a heavily engineered river, severely threatening its ecological status. The status and management strategies vary significantly between regions of the Danube River Basin. Citizen science approach can be the bridge in harmonizing water management practices across the Danube Basin and in reco...
Article
Full-text available
Urban lakes represent the most extensive water bodies in cities and provide blue ecosystem services, by retaining pollutants, offering cultural services, and mitigating climate change. Human activities threaten to decrease the supply of ecosystem services associated with urban lakes. Exorheic lakes play an essential role in reducing and changing th...
Article
Closed lakes located in urban parks act as sinks of organochlorine pesticides (OCPs), which have been used, for decades, as insecticides, herbicides and fungicides. The closed lakes from Bucharest, Romania, are periodically managed to prevent eutrophication and accumulation of pollutants. However, it is not known if these practices reduce or enhanc...
Article
Numerous studies have shown the impact of inner filter effect (IFE) on the fluorescence signal. IFE reduces the fluorescence intensity and distorts the fluorescence peak shape and position, through the absorption of the emitted radiation by the sample components. In this study, we aimed to understand the role of a non-fluorescing chromophore in IFE...
Article
Full-text available
Water quality is essential for ensuring humane living conditions for inhabitants around the world. In this context, an important aspect that must be taken into consideration is the water quality in rural areas. Special attention must be given in such cases due to a large number of possible pollution sources, from industrial or agricultural, to wast...
Article
There is a need for an inexpensive, reliable and fast monitoring tool to detect contaminants in a short time, for quick mitigation of pollution sources and site remediation, and for characterization of natural dissolved organic matter (DOM). Fluorescence spectroscopy has proven to be an excellent technique in quantifying aquatic DOM, from autochtho...
Article
Wastewater treatment is an energy-intensive operation. Energy consumption is forecast to increase by 60% in the forthcoming decade due to tightened legislation surrounding the discharge of final effluent to watercourses. Treatment plants rely on the time-consuming and unreliable biochemical oxygen demand to assess the quality of final effluent, lea...
Article
To understand the trophic state of lakes, this study aims to determine the dynamics of phytoplankton assemblages and the main factors that influence their seasonal variation. Sampling campaigns were carried out in three lakes from the Danube Delta Biosphere Reserve. Spectral analysis of specific phytoplankton pigments was applied as a diagnostic ma...
Article
The river Dambovita, which crosses Bucharest city, is characterized by two superposed artificial riverbeds: the lower part, under Dambovita river floor, which is a channel containing sewage from the city and the upper part, which is cleaner and combines with the lower part when exiting Bucharest. This study aims to evaluate the anthropogenic impact...
Article
Full-text available
The river Dambovita, which crosses Bucharest city, is characterized by two superposed artificial riverbeds: the lower part, under Dambovita river floor, which is a channel containing sewage from the city and the upper part, which is cleaner and combines with the lower part when exiting Bucharest. This study aims to evaluate the anthropogenic impact...
Article
Full-text available
This study reports the evaluation of bottled mineral water characteristics using fluorescence spectroscopy (synchronous fluorescence scans and emission spectra) and physico-chemical analyses. Samples from 14 still mineral water brands were compared to 11 tap waters collected from two Romanian cities. Correlation and factor analyses were undertaken...
Article
Wastewater quality is usually assessed using physical, chemical and microbiological tests, which are not suitable for online monitoring, provide unreliable results, or use hazardous chemicals. Hence, there is an urgent need to find a rapid and effective method for the evaluation of water quality in natural and engineered systems and for providing a...
Article
Full-text available
Considering the increase of bottled mineral water consumption all over Europe, there is a growing interest related to its chemical composition and quality, especially for the elements that are not regularly monitored. This study reports the chemical composition of 21 bottled natural mineral waters available on the Romanian market. The studied miner...
Article
In this article, we address the problem of tensor factorization subject to certain constraints. We focus on the canonical polyadic decomposition, also known as parallel factor analysis. The interest of this multilinear decomposition coupled with 3D fluorescence spectroscopy is now well established in the fields of environmental data analysis, bioch...
Article
Full-text available
Landscape is in continuous change since the human society started to exploit it. The driving forces for land-use and land-cover (LULC) changes might be considered divers, but one of the main cause is the natural resources accessibility. Oil resources shaped, indirectly, the landscape worldwide, being a direct driving force for LULC change patterns...
Conference Paper
The present study investigates whether the optical properties of different types of aquatic ecosystems from the Northern Dobrogean Plateau (inland part of South-Eastern Romania), were markedly different form each other. Algae distribution, evaluated by spectral quantification, has been analyzed from the shoreline of temporary ponds, permanent ponds...
Conference Paper
Full-text available
The present study investigates whether the optical properties of different types of aquatic ecosystems from the Northern Dobrogean Plateau (inland part of South-Eastern Romania), were markedly different form each other. Algae distribution, evaluated by spectral quantification, has been analysed from the shoreline of temporary ponds, permanent ponds...
Article
The study of optospectral techniques for the non-invasive, in vivo diagnosis of skin diseases has intensified in the last years. Optical diagnosis methods have already started to prove their ability to reveal specific skin functions and to identify skin lesions and their various stages, allowing for the early diagnosis of skin diseases and monitori...
Article
Fluorescence spectroscopy and parallel factor (PARAFAC) form a powerful tool in separating different fluorophores and may be useful in detecting the fluorescent signature of dissolved organic matter (DOM). Despite the large number of studies on fluorescence and PARAFAC it is still uncertain if this combination is capable to separate DOM from differ...
Article
Full-text available
The fluorescence intensity of dissolved organic matter (DOM) in aqueous samples is known to be highly influenced by temperature. Although several studies have demonstrated the effect of thermal quenching on the fluorescence of DOM, no research has been undertaken to assess the effects of temperature by combining fluorescence excitation - emission m...
Article
Recently, growing interest has been shown in the study of canal water quality, yet no research using continuous fluorescence monitoring to characterise dissolved organic matter (DOM) has been performed. This paper evaluated DOM characteristics at hourly resolution. A comparison was made between canal and nearby urban river fluorescence spectra, to...
Article
Full-text available
Optical coherence tomography (OCT) is one of the best options, in terms of skin penetration depth and resolution, for skin lesion diagnosis. This study reports on the use of OCT for the in vivo imaging analysis of 67 melanocytic skin lesions in 34 patients. The OCT results have been compared with the dermoscopy-the standard non-invasive, visible-li...
Conference Paper
Full-text available
The paper aims was to analyze the dynamic of abandoned land in Bucharest. Changes analysis was based on landscape metrics interpretation. The results showed in increasing surface trend, with abandonment appearing mostly in former exurban agricultural areas. The obtained values can be put under the incidence of rapid legislative and planning practic...
Article
In this Review, we try to evidence the Band Gaps (BGs) for different Photonic Crystals (PCs) structures, for both TE and TM modes. All the results were obtained by numerical simulations. We focus on the tunability of PCs, as they can be micromachined of ferroelectrics materials. We envisage three structures, namely a triangular 2D lattice of air ho...
Article
Full-text available
Fluorescence spectroscopy was used to characterize municipal wastewater at various stages of treatment in order to understand how its fluorescence signature changes with treatment and how the signal relates to biochemical oxygen demand (BOD) and chemical oxygen demand (COD). The impact of size fractionation on the fluorescence signal was also inves...
Article
Spectroscopic techniques have been intensely used in the past decades for the study of water quality. Lake water offers an indication of the health of a city, however little research has been done to evaluate the spatial distribution of dissolved organic matter (DOM), within an urban lake. This study presents the first spatial characterization of D...
Article
An ordinary differential equations (ODE) system describing the oscillation dynamics of a neuronal network is numerically integrated aiming to evidence chaos by the change in sign from negative to positive of the maximum Lyapunov exponents, and by a sudden decrease in the error doubling time. The error doubling time is calculated for different frequ...
Conference Paper
Full-text available
Dissolved organic matter (DOM) strongly influences several ecosystem processes, including the reduction of solar radiation, control of nutrient availability, modification of contaminant toxicity, and energy cycling. Using fluorescence spectroscopy, one of the most important DOM features, metal binding affinity, has been characterized, due to its di...
Article
Aluminophosphate glasses belonging to the oxide system Li2O–BaO–Al2O3–La2O3–P2O5, doped with rare earth metal ions (Eu3+, Dy3+, Ho3+ and Tm3+) were obtained by a non-conventional wet route. The influence of the doping ions on the optical properties of the phosphate glasses has been investigated in relation with structural characteristics of the vit...
Article
The study aimed at a new approach for assessment of lake water quality, correlating physico-chemical analyses and spectroscopic data with pollution sources. Water quality of lakes from a major urban area was analyzed and correlated with specific degradation sources along each lake. The results showed that water quality is impacted by the antropic a...
Article
Fluorescence spectroscopy is a promising approach to the characterization of natural aquatic components and organic pollutants, due to its rapid analysis and high sensitivity. Petroleum products had been studied, using fluorescence technique, in numerous occasions, as seawater and soil contaminant or as raw sample. Nevertheless, no complex assessme...
Article
Laser ablation surgery diminishes the collateral symptoms and the recovery time. In this study our aims were to characterize tissue destruction after laser-ablation of the ENT (Ear, Nose and Throat) soft tissues. We compare the results obtained by Optical Coherence Tomography (OCT) method with conventional histology in order to evaluate in vitro th...
Article
Bucharest is one of largest cities in Romania and disposes of natural and artificial lakes, which are utilized for different economical and leisure purposes. Water samples collected from lakes within the urbanized area were characterized by oxygen indicators (dissolved oxygen, chemical oxygen demand), nutrients related indicators (ammonia, nitrates...
Article
Recent optoelectronic developments have helped scientists and dermatologists to design and improve equipments for the diagnosis of skin lesions. Among the numerous techniques which can be used in dermatology, optical coherence tomography (OCT) represents one of the best options, in terms of skin penetration depth and resolution, for retrieving morp...
Article
Full-text available
Optical coherence tomography (OCT) is an emergent imaging technique, based on the interference of infrared radiation and living tissues, that allows the in vivo visualization of the skin structures, at high resolution and up to 1.6 mm depth. As such, there is mounting evidence that OCT may be an interesting technique for the diagnosis of skin disea...
Article
The present paper aims to evidence the characteristics of drinking water from the point of view of fluorescence spectroscopy. Fluorescence spectra of tap water, both in fresh and old state (i.e. water stored in pipes and in laboratory conditions, for a few days) are compared. The results obtained in this study recommend fluorescence spectroscopy as...
Article
Full-text available
Real-time fluorescence monitoring has been mostly performed in marine systems, with little progress being made in the application of fluorescence excitation-emission matrix (EEM) spectroscopy, especially for freshwater monitoring. This paper presents a two weeks experiment where real-time fluorescence EEM data have been obtained for Bourn Brook, Bi...
Article
Full-text available
Bucharest is one of largest cities in Romania and disposes of natural and artificial lakes, arranged for different leisure activities and some of them even for bathing. Monitoring and maintaining the quality of lentic ecosystems is important from both an economical and environmental point of view. Several lake water samples were collected from Buch...
Article
Urban systems play a vital role in social and economic development in all countries. Their environmental changes can be investigated on different spatial and temporal scales. Urban and peri-urban environment dynamics is of great interest for future planning and decision making as well as in frame of local and regional changes. Changes in urban land...
Article
Full-text available
Fluorescence data obtained by laser excitation at 266 nm were used for the first time to determine fluorescence properties of household and chicken farm discharges. Two fluorescence indices were applied: a modified humification index (HIX) and a new one, as tyrosine:tryptophan ratio (Tyr/Trp). HIX described very well the degree of contamination of...
Article
Fluorescence spectroscopy was used to evaluate the anthropogenic influence on rivers crossing Sofia. Specific fluorescence fingerprints for different sampling locations on Dragalevska, Perlovska and Vladaiska rivers were compared. The increase in pollution downstream due to the continuous contribution of surface runoff and the presence of protein-l...
Conference Paper
It is known that temperature effects the properties of DOM fluorescence, especially the fluorescence intensities. To this end it is understood that all fluorescence analyses essentially observes the fluorescence of a given sample in a 'quenched state' (Figure 1). Even so, detailed literature concerning the effects of lower temperatures (below 4 deg...
Conference Paper
Full-text available
The fluorescence properties and ecological status of urban waters around the globe are poorly understood. In light of the European Water Framework Directive there is now a need to assess the chemical and ecological status of all surface water bodies, irrespective of how heavily modified these water bodies are, throughout the Community. In particula...
Conference Paper
In-line fluorescence EEM monitoring has been performed over an eleven-day period for Bournbrook River, Birmingham, UK. River water was diverted to a portable laboratory via a continuous flow pump and filter system. Fluorescence excitation-emission matrices data was recorded every 3 minutes using a flow cell (1cm pathlength) coupled to a fiber optic...
Article
Organic matter is ubiquitous in every type of aquatic system and due to the influence that it has on their ecological health, can be used as a useful water quality indicator. Fluorescence spectroscopy has been efficiently used in the past decades to determine and characterize organic matter, and its link to function and chemical water quality. In t...
Article
Preliminary investigation of contaminated soil in the surrounding area of a petroleum tank has been carried out based on fluorescence techniques: excitation emission matrix (EEM) and synchronous fluorescence scan (SFS). A fluorescence fingerprints library containing several EEM and SFS maps for various dilutions of Romanian crude oil in methanol, w...
Article
Many up-to-date optical techniques have been developed and applied recently in clinical practice for obtaining qualitatively and quantitatively new data from the investigated lesions. Due to their high sensitivity in detection of small changes, these techniques are widely used for detection of early changes in biological tissues. Light-induced fluo...
Article
Continuous monitoring of dissolved organic matter (DOM) character and concentration at hourly resolution is rare, despite the importance of analysing organic matter variability at high-temporal resolution to evaluate river carbon budgeting, river water health by detecting episodic pollution and to determine short-term variations in chemical and eco...
Article
Full-text available
Water Framework Directive states that all Europe Rivers must achieve good ecological status by 2015. This goal is much problematic in developing countries where cities are rapidly growing and authorities have to deal with new wastewater management problems. One such case is Arges Lower Basin which represents one of the most polluted areas of Romani...
Article
Full-text available
Materia organică acvatică îşi schimbă constant caracteristicile în urma interacţiei cu diverşi compuşi care intră în sistemul acvatic prin infiltrarea în sol, prin aportul apelor pluviale sau poluare. Asemenea procese complexe duc la formarea nitraţilor. Pentru a determina cantitatea de nitraţi şi corelarea acesteia cu materia organică s-a realizat...
Article
Fluorescence spectroscopy was used to evaluate the influence of untreated wastewaters on Arges river water quality. Samples collected from the Lower Basin of the Arges River were analyzed using laser induced fluorescence spectroscopy (LIFS) and excitation-emission matrix (EEM) fluorescence. Specific fluorescence fingerprints for Arges River water w...

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Projects

Projects (4)
Project
Workshop on Organic Matter Spectroscopy. This Workshop still aims at addressing new trends and recent advances in the characterization of dissolved organic matter (DOM) in marine and inland waters, using spectroscopic techniques associated with advanced signal and image processing tools. It will be the fourth international workshop dedicated to DOM spectroscopy. The preceding edition of WOMS took place in Granada (Spain) in 2010, Toulon (France) in 2013 and Sopot (Poland) in 2015. This year it is from 23th to 27th october at Carqueiranne.
Archived project
Using innovative and traditional methods (e.g. spatial modeling, scenarios, fluorescence, sensors, remote sensing), the project experiments the evolution of ecosystems services for urban lakes under the pressure of urbanization and climate change. Considering three case studies, it will assess the actual level of main urban lakes` ecosystems services supplying: climate and air quality regulation, water self treatment and cultural services. Considering these results, the multicriteria spatial model is proposed to validate and to generate an integrative overview of urban lakes` ecosystem services supply. Land-use and climate changes scenarios will prove the future evolution of urban lakes functions and will emphasize the direction to be targeted towards SMART territorial planning decisions. The Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI) - grant number PN-III-P2-2.1-PED-2016-1300 http://www.ccmesi.ro/?p=2152