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Publications
Publications (173)
Submerged and free‐floating macrophytes are the two main vegetation types that can alternatively dominate in small shallow ponds and ditches. Submerged macrophytes provide more aquatic ecosystem services and cause fewer problems with anoxia and greenhouse gas emissions than free‐floating plants, but are inferior competitors for light. High pH value...
Although the general geomorphology is reasonably well understood, not much information is available on the incision rates of rivers and related tectonic uplift in the central parts of the Balkan Peninsula. Caves in the lower part of Crna Reka drainage (N. Macedonia) provide the possibility to reconstruct the Neogene-Quaternary evolution of this are...
Denudation is a fundamental process for the development of karst relief. It has different intensity in different geological and climatic condition and beside this many other partial factors influence the intensity and dynamic of the process during the year. In karst systems, there is often a positive correlation between water partial pressure of CO...
Recent freshwater tufa precipitation and its parent water were investigated at Szalajka valley, Sebesvíz and Dobrica Spring (Bükk Mts., Hungary). The aim of the study is to analyse the carbon isotope dynamics of freshwater tufa precipitated in karstic streams between the spring water and the first significant tufa barrage using field measurements,...
The biosorption and recovery of ionic gadolinium (Gd) from contaminated water by the free-floating duckweed Lemna gibba was studied. The highest non-toxic concentration range was determined as (6.7 mg L-1). The concentration of Gd in the medium and in the plant biomass was monitored and a mass balance was established. Tissue Gd concentration of Lem...
In this study, metal 3D printing technology was used to create lattice-shaped test specimens of orthopedic implants to determine the effect of different lattice shapes on bone ingrowth. Six different lattice shapes were used: gyroid, cube, cylinder, tetrahedron, double pyramid, and Voronoi. The lattice-structured implants were produced from Ti6Al4V...
We present the first high-resolution Holocene pollen, plant-macrofossil, and charcoal records from the upper-montane zone in the central Dinaric Alps. Drawing on these new records from well-dated lacustrine sediments of Zminje Jezero (ca. 1500 m a.s.l.; Montenegro) and on independent chironomid-inferred summer temperatures, we explore long-term eco...
Gadolinium-based contrast agents (GBCAs) used in magnetic resonance imaging (MRI) are highly resistant in the environment. They pass through wastewater treatment plants (WWTPs) unhindered escaping degradation. Although GBCAs are subjects of intensive research, we recognized that a quantitative approach to the mass balance of gadolinium, based on kn...
Analysis of phytoliths (plant silica bodies) still may have an unrevealed potential in paleoenvironmental reconstruction studies. This can provide novel findings in research on environmental change as phytoliths play an important role in the silicon biogeochemical cycle. In favorable environmental conditions, Picea abies [L.] H. Karst (Norway spruc...
Free-floating and rootless submerged macrophytes are typical, mutually exclusive vegetation types that can alternatively dominate in stagnant and slow flowing inland water bodies. A dominance of free-floating plants has been associated with a lower number of aquatic ecosystem services and can be explained by shading of rootless submerged macrophyte...
Both non-rooted submerged vegetation dominated by coontail (Ceratophyllum demersum) and non-rooted floating duckweed vegetation (Lemna gibba) can maintain their stable dominance in small ponds and channels. We examined the competitive interactions between them and how Ceratophyllum can sustain its stable state against floating plants in a range of...
Continuous lake sediment archives extending back to the coldest stage of the last glaciation (LGM: last glacial maximum) are particularly rare in the Carpathian basin. Of outstanding value is the crater lake of St. Anne (Sf. Ana / Szent Anna), at the bottom of which lake and mire sediments have accumulated and give us insight into the paleoenvironm...
Lake Sf. Ana at the top of Ciomadul volcano is one of the only open water crater lakes in the Carpathian Mountains, and has been providing a habitat to bacteria, algae, and microscopic animals in the pelagic zone, as well as rich lakeshore wildlife for 27,000 thousand years. The water of the lake is considered to be clean even today, although plent...
A zeolit és magnéziummal ioncserélt zeolitrendszer vizsgálata humán őssejteken és a különböző koncentrációk hatására
bekövetkező eltérő életképesség és ALP aktivitás értékek információt nyújtanak a csontosodást, csont „turnovert”
befolyásoló tényezőkről. Jelen munkánk célja a zeolit és a magnéziummal ioncserélt zeolit koncentrációk (0,605 mM,
0,325...
Cosmogenic radionuclide ¹⁰ Be and ²⁶ Al targets (BeO and Al 2 O 3 ) for AMS analysis are produced by a growing number of geochemical laboratories, employing different sample processing methods for the extraction of Be and Al from environmental materials. The reliability of this geochronological tool depends on data reproducibility independent from...
Here we provide the first chironomid record and associated summer air-temperature (T VII ) reconstruction between ca. 16,800–9100 cal yr BP from Lake Saint Anne (SZA), situated in the Eastern Carpathians. SZA was formed by the youngest volcanic eruption of Ciomadul volcano at ca. 29,600 cal yr BP. Our main goals in this study are to test whether wa...
We measured stable isotopes (δ ¹⁸ O and δ ¹³ C) in Sphagnum cellulose that was extracted from a long peat core drilled in the ombrotrophic Mohos peat bog, Ciomadul Mountain, Romania. The 10-m-long peat profile spans the period from 11,800 cal yr BP to present. The δ ¹⁸ O and δ ¹³ C data indicate there were several cooling events and warm periods in...
Estimation of the catchment area of a karst spring is not possible in all areas for various reasons. The Slovak Karst is protected by the highest degree of protection and karst springs are used as a source of drinking water for the second largest city in Slovakia, Košice. From this reason, no results on ionic runoff or chemical denudation have been...
Forest steppes are dynamic ecosystems, highly susceptible to changes in climate, disturbances and land use. Here we examine the Holocene history of the European forest steppe ecotone in the lower Danube Plain to better understand its sensitivity to climate fluctuations, fire and human impact, and the timing of its transition into a cultural forest...
An approach, combining several geochemical methods, was used to determine the groundwater properties and components of a hypogene karst system, where sampling is restricted only to the spring sites, and with a limited number of available sampling locations. Radiogenic isotopes (3H, 14C) were used to constrain the groundwater mean residence time and...
Travertine precipitated during the past ca. 120 years, from thermal waters in one of the historical Spas of the Buda Thermal Karst (Hungary) was investigated using radiocarbon ( ¹⁴ C). The age of the deposit is based on the historic date of the structure on which the travertine was deposited. A textural study of the travertine buildup using a ~22-c...
A novel method has been developed for the simultaneous determination of uranium, plutonium and americium nuclides in soil and sediment samples up to 5 g. Samples are destroyed by fusion with sodium hydroxide. Pre-concentration procedure tailored to the extraction chromatography is based on co-precipitation of actinides and removal of silica, iron a...
Forest steppes are dynamic ecosystems, highly susceptible to changes in climate and land use. Here we examine the Holocene history of the European forest steppe ecotone in the Lower Danube Plain to better understand its sensitivity to climate fluctuations and human impact, and the timing of its transition into a cultural forest steppe. We used mult...
Contamination of silicon semiconductor cells strongly influences their working properties, such as minority carrier lifetime. During manufacture, i.e. cutting off the silicon ingot, the entry of metal contaminants into the silicon needs to be avoided since it decreases the performance of solar cells. To study this effect, controlled contaminations...
Accurate evaluation of the preservation state of fossil phytoliths in glacial lake sediments is important, as these microfossils are often used in paleoecological and archaeological studies. The characteristic phytolith type of the Norway spruce (Picea abies [L.] Karst.) needle is a potential keystone in paleoecological studies. In this laboratory...
Taxonomic, functional and phylogenetic diversity: how subfossil cladocerans mirror contemporary community for ecosystem functioning: a comparative study in two oxbows Biases of taxa diversity and traits of source (active) and subfossil cladoceran communities with phylogenetic and functional approach were studied in two oxbows of the River Tisza, Hu...
Phytoliths-also known as plant opals-are preserved in soils and sediments and have taxonomical relevance, therefore phytoliths can be fingerprints of the vegetation of the period from which they originated. Comparative phytolith studies are essential for finding phytolith morphotypes with taxonomic relevance. These are used to build reference colle...
The formation and evolution (and so the age) of biogeochemical precipitate and calcite of thermal springs are difficult to study in their natural environment and in laboratory. In situ experiments are useful tools to better understand the physicochemical circumstances, growth and the role of microbes in mineral formation. A 12-week-long in situ exp...
The first high resolution diatom record from Lake Balaton, Hungary in Central Europe A high-resolution diatom record of the last 7500 years of Lake Balaton, a large, shallow calcareous lake in Central Europe is presented here. Diatom analyses were carried out on a 112 cm long core obtained from the Siófok Basin (eastern part of the lake) combined w...
A high-resolution diatom record of the last 7500 years of Lake Balaton, a large, shallow calcareous lake in Central Europe is presented here. Diatom analyses were carried out on a 112 cm long core obtained from the Siófok Basin (eastern part of the lake) combined with loss-on-ignition, geochemical measurements and grain-size analysis. Altogether 14...
Our study presents the hydrochemical data obtained from seven perennial springs located on the Jasov Plateau – Slovak Karst. It is part of the most heavily karstified area in Slovakia extending into northern Hungary. Monthly observations of discharge, temperature and the calcium content have been carried out on perennial springs for 19 months. Sinc...
This work focuses on building a high-resolution age-depth model for quantitative palaeoclimate study from the Mohos peat bog, East Carpathian mountains. The investigated core presents a continuous peat profile for the last 12 kyr. The chronology was based on 36 accelerator mass spectrometry radiocarbon (AMS ¹⁴ C) analyses of the separated Sphagnum...
Two archaeologically unexplored mounds were studied in the area of the central Great Hungarian Plain. The age of the construction of the mounds was clarified on the basis of radiocarbon ( ¹⁴ C) age determination of buried soil layers. Different, later-building phases of the mounds were detected by pedological and geo-electric analyses of the human-...
Buda Thermal Karst (BTK) in Hungary is an active hypogenic karst system, characterized by various discharge features like thermal and lukewarm springs, hypogene caves, different chemical and biogeochemical precipitates. Though the physicochemical characteristics of the springs in the Southern Discharge Area of BTK are similar, the morphology and di...
Carbon-based nanomaterials of different dimensions (1–3D, tubes, bundles, films, papers and sponges, graphene sheets) have been created and their characteristic properties have been discussed intensively in the literature. Due to their unique advantageous, tunable properties these materials became promising candidates in new generations of applicat...
Remains of aquatic biota preserved in mountain lake sediments provide an excellent tool to study lake ecosystem responses to past climate change. In the PROLONG project a multi-proxy study was performed on sediments of glacier-formed lakes from the Retezat Mountains, Southern Carpathians (Romania). The studied lakes (Lake Brazi and Gales) are situa...
Sediment cores obtained from two deep (>15 m) glacial lakes were analyzed in context of terrestrial vegetation development and in-lake processes from the Retezat Mountains (Southern Carpathians, Romania). Only the Holocene parts were chosen for study for testing what is the connection between geochemical changes and biotas around and in the lakes....
In this chapter, the development of efficient GdIII-based agents for MRI is detailed. This chapter is divided into ten sections covering the general theory of the relaxivity of GdIII-based contrast agents; the measurement of longitudinal (T1) and transverse (T2) relaxation times; the theory, acquisition, and interpretation of NMRD profiles; the det...
The use of gadolinium-based contrasting agents (GBCA) is increasing because of the intensive usage of these agents in magnetic resonance imaging (MRI). Waste-water treatment does not reduce anthropogenic Gd-concentration significantly. Anomalous Gd-concentration in surface waters have been reported worldwide. However, removal of GBCA-s by aquatic m...
Gills are major targets for acute metal toxicity in fish, due to their permanent contact with aquatic pollutants. To assess the effects of metals on gills of the Leuciscus cephalus (chub), fish individuals were collected from two sites in the Tur River, Romania, in upstream (site 1) and downstream (site 2) of a metal pollution source. Quantitative...
The marigold extracts are used in traditional medicine for its anti-inflammatory, decongestive, antiseptic, antifungal, antimicrobial and immunostimulating properties. Existing studies have partially proved these properties, but are incomplete with regard to the possibility of standardizing the extract using the best working conditions so as it to...
The marigold extracts are used in traditional medicine for its anti-inflammatory, decongestive, antiseptic, antifungal, antimicrobial and immunostimulating properties. Existing studies have partially proved these properties, but are incomplete with regard to the possibility of standardizing the extract using the best working conditions so as it to...
A radioanalytical method (based on separation using UTEVA columns and ICP-MS measurement) has been used for determination of ⁹³Zr in 37 nuclear power plant samples. As ⁹³Nb might affect the detection of ⁹³Zr, Monte Carlo activation model was used to calculate the expected ⁹³Zr/natZr mass ratio, which was compared to measured ones. It was found, tha...
Plant seeds are highly sensitive to environmental stress. The aim of our paper was to assess the effects of high nutrient levels in the water and sediment of thermal ponds and rivers on the ecosystem, based on the seed germination and root elongation of S. alba in the Lëngaricës Valley, Albania. Significant differences were found in the physicochem...
Frogs and toads are frequently used as bioindicators of inorganic pollutants. Anthropogenic stress was assessed in three lakes from Hungary (Naplás, Frog Pond and Lak-völgyi Reservoir), by studying the concentration of trace elements in the toe bones of Bufo bufo. Lake Naplás was the most affected by anthropogenic effects, but Frog Pond was also ch...
Two high-altitude lake-sediment sequences (Lake Lia, 1910 m a.s.l. and Lake Bucura, 2040 m a.s.l.) from the Retezat Mountains (South Carpathians, Romania) were analysed using multi-proxy methods to study responses of treeline, timberline and alpine/subalpine vegetation to climate change and human impact during the past 16,000 years. Woody species (...
Elemental composition of dust deposited onto leaf surfaces was analysed in this study. Leaves of oleander (Nerium oleander L.) were collected for testing the environmental quality from Tripoli (Libya), Tajura (suburban of Tripoli) and Ghadames (remote area). Elemental analysis was carried out by ICP-OES. Principle component analysis (PCA) and enric...
As demonstrated by an increasing number of palaeoclimatic and palaeoecological studies, rapid climate change events (RCCs) occurred frequently in the Holocene and their timing correlates well in the European records. Changes in vegetation composition and environmental conditions were significant during these RCC events. In this study we use high re...
To investigate treeline and timberline dynamics in the Retezat Mountains (Romanian Carpathians), late glacial and Holocene sediment sequences from four lakes were studied. The south and north slopes of the mountain range were compared using two lakes from the north flank (Lake Brazi, 1740 m a.s.l. and Lake Gales, 1990 m a.s.l) and two from the sout...
We assessed contamination in the Upper Tisza region (Hungary, Central Europe), analyzing the elemental concentrations in sediment cores of oxbows. Our hypothesis was that the metal contamination which occurred in the year 2000 and which came from the mining area in Transylvania (Romania) may be detected even 15 years after the contamination, based...
A laboratory measurement of the α-decay half-life of ¹⁹⁰Pthas been performed using a low background Frisch grid ionisation chamber. A total amount of 216.60(17) mg of natural platinum has been measured for 75.9 days. The resulting half-life is (4.97±0.16)×1011 years, with a total uncertainty of 3.2%. This number is in good agreement with the half-l...
Multi-proxy, high-resolution analyses (lithological, geochemical, environmental magnetism) anchored by 22 ¹⁴C dates, of a 5.53 m long sediment core from Lake Ighiel (Romanian Carpathians, central-eastern Europe) allowed the reconstruction of key local, catchment-lacustrine dynamics and an appraisal of palaeohydrological and palaeoclimatic gradients...
Forty-eight samples made of CaF2, LiF and YVO4 were placed inside the KSTAR Tokamak and irradiated by neutrons and charged particles from eight plasma pulses. The aim was to provide information for plasma diagnostics. Due to the short pulse durations, the activities induced in the samples were low and therefore measurements were performed in five l...
p>Oxbow lakes are important components of the floodplain systems of lowland rivers. During flood events, oxbows are connected with the main river channel, and behave as lotic systems, while during inter-flood periods, these lakes can be considered as lentic ecosystems. Rivers are generally poor in planktonic organisms and their sediments contain sc...
This study summarizes the results of radiocarbon dating and age-depth modelling in four mountain lakes (Brazi, Gales, Bucura and Lia) in the Retezat Mountains. Altogether 69 AMS ¹⁴C measurements were performed on these deposits, mostly on terrestrial plant macrofossils. In several cases, plant macrofossils, aquatic animal remains (Cladoceran eggs)...
Szemlő-hegy Cave, belonging to the hypogenic cave system of Rózsadomb, is currently situated in the vadose zone (165 to 215 m asl). It is supposed to have formed under phreatic conidtions, its present position being the result of tectonically controlled uplift of the area in Pleistocene times. Molnár János Cave, being part of the same cave system i...
Abstract: The paper gives the results of an isotope investigation carried out on the waters of the crater-lake, Lake Saint Ana (Sf. Ana), of the Ciomadul Mountain, which is located in the Harghita Mountains of the East Carpathians in Romania. The main purpose of this study was to ivestigate the isotope signature of the lake water. The collected wat...
To investigate Holocene vegetation and fire-disturbance histories in the treeline ecotone, macroscopic charcoal, plant-macrofossil, and pollen records from two lacustrine sediment records were used. Lake Lia is on the southern slope and Lake Brazi is on the northern slope of the west-east-oriented Retezat Mountain range in the Romanian Carpathians....
In this paper, we present high-resolution early Holocene pollen, plant macrofossil, charcoal, diatom, biogenic silica, and loss-on-ignition records from a mountain lake in the South Carpathians in order to reveal ecosystem response to the 8.2-ka climatic oscillation. We found significant changes both in terrestrial vegetation and lake diatom assemb...
In this work, we investigated the mineral profile, the bioactive compounds (phenols, flavonoids) content and the antioxidant capacity of wild blueberries and their pharmaceutical preparations (tea, alcoholic extract and capsules). The highest content of phenols and flavonoids was recorded in the alcoholic sample (813.42 ± 15.55 mg GAE-gallic acid e...
By using GIS methods for approximately the past 250 years changes of the riverbed of the Mura River were reconstructed in the part I. of the study. The meander movement and cut-off is forecasted. Flood maps from MIKE 21 FM 2D hydraulic modelling and old historical maps were compared and evaluated. In the Part II the silting up processes for the sam...
Climatic changes were studied using siliceous algae (diatoms and Chrysophyta stomatocysts) analyses in four mountain lakes in the Retezat Mountains in the South-Carpathian Mountains with the aim to search for synchrony in aquatic ecosystem responses. According to the basal radiocarbon dating of the lake sediment cores, these lakes were formed aroun...