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Article: Chemical composition of labile carbon fractions in Hungarian forest soils: Insight into biogeochemical coupling between DOM and POM

Filep, Tibor / Zacháry, Dóra / Jakab, Gergely / Szalai, Zoltán

Geoderma. 2022 Aug. 01, v. 419

2022

Abstract: Understanding how the chemical composition of dissolved and particulate organic matter (DOM and POM) is affected by environment factors is critical because these labile pools of carbon are involved in an array of biological, chemical and physical ... ...

Abstract	Understanding how the chemical composition of dissolved and particulate organic matter (DOM and POM) is affected by environment factors is critical because these labile pools of carbon are involved in an array of biological, chemical and physical processes. In this study, the chemical composition of DOM and POM was measured in 13 forest soils using UV–Vis spectroscopy, fluorescence spectroscopy with parallel factor analysis (PARAFAC modelling) and FT-IR spectroscopy. There were significant differences between the soils for the SUVA indexes, PARAFAC components and relative intensities of different IR bands. Redundancy analysis (RDA) revealed that soil parameters had a strong influence on the chemical composition of DOM and POM with high constrained variability (77.9 and 77.1 %, respectively). The pH of the soils proved to be an important controlling factor for both DOM and POM, regulating the concentration of the C3 PARAFAC component (low-molecular-weight compounds associated with biological activity) and the aromatic compounds of POM (aromaticity, rA₁₆₃₀ and rA₁₅₁₅). The silt content was the other main regulating factor controlling the chemical characteristics of the labile pool, having a strong negative correlation with the specific UV absorbance (SUVA) values of DOM due to the preferential adsorption of hydrophobic moieties. RDA analysis also revealed that there is a strong correlation between the chemical composition of POM and DOM: the relative amount of aromatic compounds (rA₁₅₁₅, rA₁₆₃₀ for aromatic rings and rA₁₂₇₀ for phenolic compounds) in the POM fraction was closely correlated with the SUVA values of the DOM. This clearly indicates a strong biogeochemical link between the two labile organic carbon fractions; the high molecular weight compounds of the DOM fraction may be derived from lignin-like structures of the POM fraction.
Keywords	Fourier transform infrared spectroscopy ; absorbance ; adsorption ; bioactive properties ; factor analysis ; fluorescence emission spectroscopy ; forests ; hydrophobicity ; labile carbon ; molecular weight ; pH ; particulate organic matter ; silt fraction ; ultraviolet-visible spectroscopy
Language	English
Dates of publication	2022-0801
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	281080-3
ISSN	1872-6259 ; 0016-7061
ISSN (online)	1872-6259
ISSN	0016-7061
DOI	10.1016/j.geoderma.2022.115867
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Article ; Online: The effect of mineral composition on soil organic matter turnover in temperate forest soils

Zacháry, Dóra / Filep, Tibor / Jakab, Gergely / Ringer, Marianna / Balázs, Réka / Németh, Tibor / Szalai, Zoltán

J Soils Sediments. 2023 Mar., v. 23, no. 3 p.1389-1402

2023

Abstract: PURPOSE: The aim of this work was to determine the characteristics of SOM decomposition under forest vegetation and to investigate the influence of soil mineralogy on SOM turnover. METHODS: Thirteen Hungarian forest topsoil samples amended with maize ... ...

Abstract	PURPOSE: The aim of this work was to determine the characteristics of SOM decomposition under forest vegetation and to investigate the influence of soil mineralogy on SOM turnover. METHODS: Thirteen Hungarian forest topsoil samples amended with maize residues were incubated at 20 °C for 163 days. The CO₂ evolved was measured and the fast and slow decomposition rate constants (k₁ and k₂, respectively) of SOM were quantified using a first-order two pools model. Linear regression analysis was applied between the quantity of total mineralized carbon (TMC), k₁ and k₂ values and the mineralogical parameters of the soils. RESULTS: The illite (R² = 0.797, p < 0.001) and non-swelling clay mineral (R² = 0.767, p < 0.001) content and the dithionite–citrate–bicarbonate-extractable Al (AlDCB, R² = 0.708, p < 0.001) and ammonium-oxalate-extractable Al concentration (AlOX, R² = 0.627, p < 0.01) reduced the TMC to the greatest extent. The AlDCB (R² = 0.681, p < 0.001), AlOX (R² = 0.583, p < 0.01) and illite (R² = 0.545, p < 0.01) contents had strong negative relationship with the k₁ value. The k₂ value was only affected by the non-swelling clay mineral (R² = 0.467, p < 0.05) and illite (R² = 0.574, p < 0.01) contents. CONCLUSION: These results confirm that the mineral composition of the soil, including the Al oxide, non-swelling clay mineral and illite contents, may significantly inhibit the decomposition of SOM, showing that illite minerals may provide binding surfaces for SOM over a longer timescale.
Keywords	aluminum oxide ; carbon ; carbon dioxide ; clay ; corn ; illite ; mineral content ; mineralization ; models ; regression analysis ; soil mineralogy ; soil organic matter ; temperate forests ; topsoil
Language	English
Dates of publication	2023-03
Size	p. 1389-1402.
Publishing place	Springer Berlin Heidelberg
Document type	Article ; Online
ZDB-ID	2050898-0
ISSN	1614-7480 ; 1439-0108
ISSN (online)	1614-7480
ISSN	1439-0108
DOI	10.1007/s11368-022-03393-8
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Article ; Online: Morphological analysis of mineral grains from different sedimentary environments using automated static image analysis

Gresina, Fruzsina / Farkas, Beáta / Fábián, Szabolcs Ákos / Szalai, Zoltán / Varga, György

Sedimentary Geology. 2023 Aug. 07, p.106479-

2023 , Page(s) 106479–

Abstract: The properties of sediment grain shape provide valuable information about the transport mechanisms in different sedimentary and geomorphological environments. With the emergence of new, high-resolution analytical techniques, it has become possible to ... ...

Abstract	The properties of sediment grain shape provide valuable information about the transport mechanisms in different sedimentary and geomorphological environments. With the emergence of new, high-resolution analytical techniques, it has become possible to quickly examine the grain shape properties of a large number of individual mineral grains. In this study, we used automated image analysis (Malvern Morphologi G3SE-ID) to investigate mineral particles of four sediment types from different depositional environments (sand sheet (1), floodplain (2) and fluvial channel deposits (3), Pleistocene infilling material of sand wedges (4), n = 20) in the Carpathian Basin (Central Europe). Our primary objective was to identify quantitative key variables that can help objectively distinguish certain geomorphological environments located in the Carpathian Basin. In our analysis and data processing (which included techniques such as hierarchical cluster analysis, Wilks' λ, Kruskal-Wallis, multivariate analysis of variance and principal component analysis) we focused on four variables related to grain shape: circularity (form), convexity (surface texture), solidity (roundness) and elongation (form). The form of sedimentary grains depends largely on the physical properties of their source area, while the roundness depends on the energy of the transport medium and the distant of transportation. Surface texture or convexity can change in a relatively short time in fluvial environment. The study revealed that distinguishing geomorphological environments can be achieved by analyzing the circularity, convexity and solidity parameters of the sediment grains. Based on the established grouping, the analyses carried out with hundred repetitions showed that HS circularity, convexity and solidity variables were the most effective attributes regarding Kruskal-Wallis test statistics it provided significant (p < 0.001) results between the analyzed sedimentary environments, while the elongation was not able to provide significant results between the grouped samples. Statistical analyses of the MANOVA test with hundredfold repetitions showed significant differences between the derived groups. Wilks' λ test statistics and PCA showed that convexity and HS circularity discriminate the groups. Separate analyses of aeolian and fluvial sediments have been carried out. The Kruskal-Wallis analysis of variance showed the significant differences considering all four variables, and differences were also significant in the case of MANOVA test. Wilks' λ test statistics and PCA showed that convexity, HS circularity and solidity discriminate the groups. According to our results, the circularity parameter can provide information about the transport distance, while the solidity parameter can indicate the transport energy. The convexity parameter can serve as an indicator of both transport distance, as well as post-depositional processes. Some infilling materials underwent multiple transport processes, including high energy aqueous, wind transport mechanisms, and post-depositional alteration process (frost weathering), while others originated from sand-sheet covered areas (active during Pleistocene glacials).The solidity parameter proved effective in separating sediments with similarly high convexity values (smooth surface), which were, in our case, from recent aeolian and fluvial environments. This result was due to the investigated fluvial sediments inherited their form and low level of roundness from their source area. Our research supports that aeolian transport is more effective in rounding the grains than the aqueous environment. Using automated static image analysis producing statistically stable results with hundreds of analyzed mineral grains provide useful indicators for paleogeographical reconstruction studies by investigating paleo and recent sediments.
Keywords	Pleistocene epoch ; automation ; basins ; cluster analysis ; energy ; floodplains ; frost ; image analysis ; multivariate analysis ; principal component analysis ; sand ; texture ; transportation ; wind ; Central European region ; Grain shape ; Sediment transport ; Micromorphology ; Paleoenvironment ; Granulometry ; Granulometric proxy
Language	English
Dates of publication	2023-0807
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Pre-press version
ZDB-ID	216739-6
ISSN	0037-0738
ISSN	0037-0738
DOI	10.1016/j.sedgeo.2023.106479
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Article ; Online: Novel Damage Biomarkers of Sepsis-Related Acute Kidney Injury.

Ragán, Dániel / Horváth-Szalai, Zoltán / Szirmay, Balázs / Mühl, Diána

EJIFCC

2022 Volume 33, Issue 1, Page(s) 11–22

Abstract: Sepsis-related acute kidney injury (AKI) is one of the most common complications of sepsis at the intensive care unit (ICU) with more adverse mortality rates. The early diagnosis and reliable monitoring of sepsis-related AKI are essential in achieving a ... ...

Abstract	Sepsis-related acute kidney injury (AKI) is one of the most common complications of sepsis at the intensive care unit (ICU) with more adverse mortality rates. The early diagnosis and reliable monitoring of sepsis-related AKI are essential in achieving a favorable outcome. Novel serum and urinary biomarkers could yield valuable information during this process. Regarding the widely used Kidney Disease Improving Global Outcomes (KDIGO) classifications, the diagnosis of AKI is still based on the increase of serum creatinine levels and the decrease of urine output; however, these parameters have limitations in reflecting the extent of kidney damage, therefore more sensitive and specific laboratory biomarkers are needed for the early diagnosis and prognosis of sepsis-related AKI. Regarding this, several serum parameters are discussed in this review including presepsin and the most important actin scavenger proteins (gelsolin, Gc-globulin) while other urinary markers are also examined including cell cycle arrest biomarkers, neutrophil gelatinase-associated lipocalin (NGAL), kidney injury molecule 1 (KIM-1), Cystatin C and actin. Novel biomarkers of sepsis-related AKI could facilitate the early diagnosis and monitoring of sepsis-related AKI.
Language	English
Publishing date	2022-04-11
Publishing country	Italy
Document type	Journal Article
ISSN	1650-3414
ISSN (online)	1650-3414
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Article ; Online: Sérvek sebészi kezelése "akkor és most" a Debreceni Sebészeti Klinikán.

Orosz, László / Ötvös, Csaba / Haba, Gergő / Szalai, Zoltán / Tóth, Dezső

Magyar sebeszet

2022 Volume 75, Issue 1, Page(s) 58–60

Language	English
Publishing date	2022-03-24
Publishing country	Hungary
Document type	Editorial
ZDB-ID	414068-0
ISSN	1789-4301 ; 0025-0295
ISSN (online)	1789-4301
ISSN	0025-0295
DOI	10.1556/1046.2021.10011
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Article ; Online: Effects of root-derived organic acids on sorption of pharmaceutically active compounds in sandy topsoil.

Szabó, Lili / Vancsik, Anna / Bauer, László / Jakab, Gergely / Király, Csilla / Hatvani, István Gábor / Kondor, Attila Csaba / Szalai, Zoltán

Chemosphere

2024 Volume 355, Page(s) 141759

Abstract: The presence and fate of pharmaceutically active compounds (PhACs) in agricultural fields are rarely investigated. The present study highlights that root-derived low-molecular-weight organic acids (LMWOAs) affect the mobility of PhACs in cultivated humic ...

Abstract	The presence and fate of pharmaceutically active compounds (PhACs) in agricultural fields are rarely investigated. The present study highlights that root-derived low-molecular-weight organic acids (LMWOAs) affect the mobility of PhACs in cultivated humic Arenosol. Sorption experiments are conducted using three PhACs characterised by different physicochemical properties: carbamazepine (CBZ), 17α-ethinylestradiol (EE2), and diclofenac-sodium (DFC). The results suggest that the adsorption of EE2 is more intense than the other two PhACs, whereas DFC and CBZ are primarily dominated by desorption. LMWOAs mainly provide additional low-energy adsorption sites for the PhACs, and slight pH changes do not significantly affect the sorption mechanism. During competitive adsorption, the high-energy sites of the adsorbents are initially occupied by EE2 owing to its high adsorption energy (∼15 kJ/mol). The new low-energy binding sites enhance the adsorption of DFC (from 8.5 % to 72.0 %) and CBZ (from 31.0 % to 70.0 %) during multicomponent adsorption. LMWOAs not only affect adsorption by modifying the pH but also provide additional binding sites that allow the PhACs to remain in the root environment for a longer period. As the concentration of LMWOAs temporarily changes, so does the availability of PhACs in the root zone. Environmental changes in the humic horizon enhance the mobility of the adsorbed PhACs, which renders them continuously available for uptake by plants, thus increasing the possibility of PhACs entering the human food chain.
MeSH term(s)	Humans ; Sand ; Organic Chemicals ; Acids ; Adsorption ; Water Pollutants, Chemical/analysis
Chemical Substances	Sand ; Organic Chemicals ; Acids ; Water Pollutants, Chemical
Language	English
Publishing date	2024-03-24
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2024.141759
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Article ; Online: Countrywide mapping and assessment of organic carbon saturation in the topsoil using machine learning-based pedotransfer function with uncertainty propagation

Szatmári, Gábor / Pásztor, László / Laborczi, Annamária / Illés, Gábor / Bakacsi, Zsófia / Zacháry, Dóra / Filep, Tibor / Szalai, Zoltán / Jakab, Gergely

Catena. 2023 June, v. 227 p.107086-

2023

Abstract: Stakeholders and policymakers have been becoming more and more interested not just in the potential organic carbon (SOC) saturation level of soils but also in spatially explicit information on the degree of SOC deficit, which can support future policy ... ...

Abstract	Stakeholders and policymakers have been becoming more and more interested not just in the potential organic carbon (SOC) saturation level of soils but also in spatially explicit information on the degree of SOC deficit, which can support future policy and sustainable management strategies, and carbon sequestration-associated spatial planning. Thus the objective of our study was to develop a cubist-based pedotransfer function (PTF) for predicting and mapping the saturated SOC content of the topsoils (0-30 cm) in Hungary and then compare the resulting map with the actual SOC map to determine and assess the degree of SOC deficit. It was assumed that topsoils covered by permanent forests can be practically considered as saturated in SOC. Using the monitoring points of the Hungarian Soil Information and Monitoring System located in forests as reference soil profiles, we developed a cubist-based PTF. The transparent model structure provided by cubist allowed to show that not just the physicochemical properties of soils (e.g., texture, and pH) but also environmental conditions, such as topography (e.g., slope, altitude, and topographical position) and climate (e.g., long-term mean annual temperature, and evaporation), characterizing landscape are important factors in predicting the level of SOC saturation. Our results also pointed out that there is SOC deficit on large part of the country (∼80%) showing high spatial variability. It was also revealed that the most considerable potential for additional SOC sequestration can be found related to soils with medium to high actual SOC content.
Keywords	altitude ; carbon sequestration ; catenas ; climate ; evaporation ; issues and policy ; landscapes ; organic carbon ; pH ; pedotransfer functions ; stakeholders ; temperature ; texture ; topsoil ; uncertainty ; Hungary ; Soil organic carbon ; Organic carbon saturation ; Cubist ; Pedotransfer function ; Digital soil mapping ; Uncertainty propagation ; SOC ; SOM ; PTF ; ML
Language	English
Dates of publication	2023-06
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Use and reproduction
ZDB-ID	519608-5
ISSN	1872-6887 ; 0008-7769 ; 0341-8162
ISSN (online)	1872-6887 ; 0008-7769
ISSN	0341-8162
DOI	10.1016/j.catena.2023.107086
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Article ; Online: SPATIAL AND TEMPORAL PATTERN OF SOIL pH AND Eh AND THEIR IMPACT ON SOLUTE IRON CONTENT IN A WETLAND (TRANSDANUBIA, HUNGARY)

SZALAI ZOLTÁN

Acta Geographica Debrecina: Landscape and Environment Series, Vol 2, Iss 1, Pp 34-

2008 Volume 45

Abstract: Land mosaics have direct and indirect influence on chemical reaction and redox condition of soils. The present paper deals with the relationship between some environmental factors (such as soil andvegetation patterns, micro-relief, water regime, ... ...

Abstract	Land mosaics have direct and indirect influence on chemical reaction and redox condition of soils. The present paper deals with the relationship between some environmental factors (such as soil andvegetation patterns, micro-relief, water regime, temperature and incident solar radiation) and the pH, Eh of soils and solute iron in a headwater wetland in Transdanubia, Hungary. Measurements have been taken in four different patches and along their boundaries: sedge (Carex vulpina, Carex riparia, three patches and two species), horsetail (Equisetum arvense), common nettle (Urtica dioica). Thespatial pattern of the studied parameters are influenced by the water regime, micro-topography, climatic conditions and by direct and indirect effects of vegetation. The indirect effect can be the shading, which has influence on soil temperature and on the incident solar radiation (PAR). Root respiration and excretion of organic acids appear as direct effects. There have been measured individual pH and Eh characteristic in the studied patches. Soil Eh, pH and solute iron have shown seasonal dynamics. Higher redox potentials (increasingly oxidative conditions) and higher pH values were measured between late autumn and early spring. The increasing physiological activity of plants causes lower pH and Eh and it leads to higher spatial differences. Although temperature is an essential determining factor for Eh and pH, but our results suggest it rather has indirect effectsthrough plants on wetlands.
Keywords	geoecology ; wetland ; pH ; Eh ; iron ; Environmental sciences ; GE1-350 ; Ecology ; QH540-549.5
Subject code	580
Language	English
Publishing date	2008-06-01T00:00:00Z
Publisher	University of Debrecen
Document type	Article ; Online
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Article: Secondary hormonal alterations in short-term severe hypothyroidism; in the focus: Apelin and copeptin.

Gergics, Marin / Pham-Dobor, Gréta / Horváth-Szalai, Zoltán / Kőszegi, Tamás / Mezősi, Emese / Bajnok, László

Frontiers in endocrinology

2022 Volume 13, Page(s) 981891

Abstract: Objective: This study aimed to investigate the complex interactions of thyroid hormone, apelin, and copeptin in the fluid-ion homeostasis of patients with severe transitory hypothyroidism.: Methods: In this prospective observational study, 39 ... ...

Abstract	Objective: This study aimed to investigate the complex interactions of thyroid hormone, apelin, and copeptin in the fluid-ion homeostasis of patients with severe transitory hypothyroidism. Methods: In this prospective observational study, 39 patients (ECOG: 0; 11 men, 28 women, mean age: 50.3 ± 14.9 years) were investigated during short-term severe hypothyroidism due to surgical removal of the thyroid gland and after adequate thyroid replacement therapy. In addition to the routinely available lab tests, copeptin and apelin levels were determined using ELISA. Results: In the hypothyroid state, apelin concentration was lower, while copeptin levels did not differ compared to the euthyroid condition. Apelin showed a positive correlation with copeptin ( Conclusions: In short-term severe hypothyroidism, serum apelin level is markedly decreased, which may predispose susceptible patients to hyponatremia, while the level of copeptin is unchanged. TSH and copeptin are independent predictors of apelin concentration, of which TSH is stronger.
MeSH term(s)	Adrenocorticotropic Hormone ; Adult ; Aged ; Apelin ; Female ; Glycopeptides ; Humans ; Hydrocortisone ; Hypothyroidism ; Male ; Middle Aged ; Sodium ; Thyroid Hormones ; Thyrotropin
Chemical Substances	Apelin ; Glycopeptides ; Thyroid Hormones ; copeptins ; Adrenocorticotropic Hormone (9002-60-2) ; Thyrotropin (9002-71-5) ; Sodium (9NEZ333N27) ; Hydrocortisone (WI4X0X7BPJ)
Language	English
Publishing date	2022-09-14
Publishing country	Switzerland
Document type	Journal Article ; Observational Study ; Research Support, Non-U.S. Gov't
ZDB-ID	2592084-4
ISSN	1664-2392
ISSN	1664-2392
DOI	10.3389/fendo.2022.981891
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Article ; Online: Follicular Fluid Proteomic Analysis of Women Undergoing Assisted Reproduction Suggests That Apolipoprotein A1 Is a Potential Fertility Marker.

Kurdi, Csilla / Schmidt, János / Horváth-Szalai, Zoltán / Mauchart, Péter / Gödöny, Krisztina / Várnagy, Ákos / Kovács, Gábor L / Kőszegi, Tamás

International journal of molecular sciences

2023 Volume 25, Issue 1

Abstract: Infertility affects millions worldwide, posing a significant global health challenge. The proteomic analysis of follicular fluid provides a comprehensive view of the complex molecular landscape within ovarian follicles, offering valuable information on ... ...

Abstract	Infertility affects millions worldwide, posing a significant global health challenge. The proteomic analysis of follicular fluid provides a comprehensive view of the complex molecular landscape within ovarian follicles, offering valuable information on the factors influencing oocyte development and on the overall reproductive health. The follicular fluid is derived from the plasma and contains various proteins that can have different roles in oocyte health and infertility, and this fluid is a critical microenvironment for the developing oocytes as well. Using the high-performance liquid chromatography-mass spectrometry method, we investigated the protein composition of the follicular fluid, and after classification, we carried out relative quantification of the identified proteins in the pregnant (P) and non-pregnant (NP) groups. Based on the protein-protein interaction analysis, albumin and apolipoprotein A1 (ApoA1) were found to be hub proteins, and the quantitative comparison of the P and NP groups resulted in a significantly lower concentration of ApoA1 and high-density lipoprotein cholesterol in the P group. As both molecules are involved in the cholesterol transport, we also investigated their role in the development of oocytes and in the prediction of fertility.
MeSH term(s)	Female ; Humans ; Pregnancy ; Apolipoprotein A-I ; Cholesterol, HDL ; Fertility ; Follicular Fluid ; Infertility ; Proteomics ; Reproduction
Chemical Substances	Apolipoprotein A-I ; Cholesterol, HDL ; APOA1 protein, human
Language	English
Publishing date	2023-12-29
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2019364-6
ISSN	1422-0067 ; 1422-0067 ; 1661-6596
ISSN (online)	1422-0067
ISSN	1422-0067 ; 1661-6596
DOI	10.3390/ijms25010486
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