Effect of molybdenum treatment on the element uptake of food crops in a long-term field experiment

Molybdenum, as a constituent of several important enzymes, is an essential microelement. It can be found in all kind of food naturally at lowlevels. However, environmental pollution, from natural or anthropogenic sources, can lead to high levels of the metal in plants. Our study is based on long-term field experiments at Nagyhörcsök, where different levels of soil contamination conditions are simulated. Plant samples were collected from the experiment station to study the behavior of elements: uptake by and transport within the plants, accumulation in different organs, phytotoxicity and effects on the quantity and quality of the crop. In this study, we present the effect of molybdenum treatment on the uptake of other elements. Molybdenum is proved to be in an antagonist relationship with copper and sulphur, while molybdenum-phosphorus is a synergist interaction. However, in most of the plants we studied, increasing molybdenum-treatment enhanced cadmium uptake. We found the most significant cadmium accumulation in the case of pea, spinach and red beet.&nbsp

Parameter optimization of an inductively coupled plasma mass spectrometer for measuring arsenic and selenium

In the last decades, an increased interest has evolved in arsenic and selenium. The aim is to understand the environmental, agricultural and biological roles of these elements. In the case of arsenic, the major reasons are the relatively high concentration of arsenic in marine biota (mg kg-1) and the arsenic contaminated drinking water bases of some Asian countries, as well as Hungary. The toxicity of higher level selenium content is also known; nevertheless, selenium is essential for several biological functions. Considering its essentialness, in our country, the insufficient selenium intake rate causes a lack of selenium. Measuring the concentrations of these elements provides crucial, but unsatisfactory information, as the speciation, i.e. the form of an element presented in a sample is also required.In both cases, the most suitable method to determine concentration is inductively coupled plasma mass spectrometry (ICP-MS). Our objective was to optimize the variable parameters of the ICP-MS to attain the lowest (the best) detection limit. For this purpose, we investigated the effect of parameter change on net signal intensity and relative signal intensity. With the optimized parameter settings, the limits of detection for arsenic and selenium were determined, which are 0,032 ng dm-3 for arsenic, and 0,097 ng dm-3 for selenium.&nbsp

A sportolás intézményi különbségei hazai és határon túli kisebbségi magyar felsőoktatási intézményekben

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A SPORTOLÁS INTÉZMÉNYI KÜLÖNBSÉGEI HAZAI ÉS HATÁRON TÚLI KISEBBSÉGI MAGYAR FELSŐOKTATÁSI INTÉZMÉNYEKBEN = INSTITUTIONAL DIFFERENCES IN SPORTS IN HUNGARIAN AND CROSS-BORDER MINORITY HUNGARIAN HIGHER EDUCATION INSTITUTIONS

Tanulmányunk célja, hogy megvizsgáljuk, milyen különbségek és hasonlóságok vannak Magyarországon az Észak-alföldi Régió, néhány határon túli kisebbségi magyar és többségi intézmény hallgatói között sportolási gyakoriságukat, motivációikat és a sportolás intézményi környezetét tekintve Szlovákiában, Ukrajnában, Romániában és Szerbiában. Kutatásunk módszereiként kvantitatív és kvalitatív metódusokat egyaránt alkalmaztunk. A kvantitatív vizsgálatban a kérdőíves lekérdezés során 15 intézmény 2017 hallgatója adott választ kérdéseinkre. A kvalitatív kutatásban nyolc interjút készítettünk sportért felelős intézetvezetőkkel és testnevelést oktatókkal. A kutatás eredményei többek között, hogy a hallgatók sportolási szokásait nagyban befolyásolja az intézményi környezet, a megfelelő intézményi infrastruktúra, változatos, közösségteremtő sportprogramok és a kidolgozott sportkoncepció

A sportolás intézményi különbségei hazai és határon túli kisebbségi magyar felsőoktatási intézményekben

The purpose of our study is to examine the differences and similarities between the students of the Hungarian Northern Great Plain Region, some cross-border minority and the majority institutions in terms of their sporting frequency, motivation and the institutional environment of sports in Slovakia, Ukraine, Romania and Serbia. Quantitative and qualitative methods were used as well in our research. In the quantitative study, a questionnaire query was answered by 2017 students from 15 institutions. In the qualitative research we conducted eight interviews with sports leaders and physical education instructors. The results of the research include that the sports habits of students are largely influenced by the institutional environment, the proper institutional infrastructure, diverse, community-building sports programs and the elaborated sport concept

Effect of molybdenum treatment on the element uptake of food crops in a long-term field experiment

Molybdenum, as a constituent of several important enzymes, is an essential microelement. It can be found in all kind of food naturally at lowlevels. However, environmental pollution, from natural or anthropogenic sources, can lead to high levels of the metal in plants. Our study is based on long-term field experiments at Nagyhörcsök, where different levels of soil contamination conditions are simulated. Plant samples were collected from the experiment station to study the behavior of elements: uptake by and transport within the plants, accumulation in different organs, phytotoxicity and effects on the quantity and quality of the crop. In this study, we present the effect of molybdenum treatment on the uptake of other elements. Molybdenum is proved to be in an antagonist relationship with copper and sulphur, while molybdenum-phosphorus is a synergist interaction. However, in most of the plants we studied, increasing molybdenum-treatment enhanced cadmium uptake. We found the most significant cadmium accumulation in the case of pea, spinach and red beet

Circulating P-Selectin Glycoprotein Ligand 1 and P-Selectin Levels in Obstructive Sleep Apnea Patients

Purpose Obstructive sleep apnea (OSA) is characterized by chronic intermittent hypoxia which induces inflammation in blood vessels leading to the development of cardiovascular comorbidities. Several studies implicated the role of P-selectin in vascular inflammation of OSA. P-selectin glycoprotein ligand 1 (PSGL-1) is the main activator for P-selectin and is involved in immune cell trafficking. However, PSGL-1 has not been analyzed in OSA. The aim of the study was to investigate plasma PSGL-1 and P-selectin levels to have a deeper understanding on their interaction in obstructive sleep apnea. Methods Fifty-one untreated patients with OSA and 42 non-OSA controls were recruited. Plasma PSGL-1 levels were determined in evening and morning samples, P-selectin levels were analyzed in morning samples using commercially available ELISA kits. Polysomnography was performed in all participants. OSA was defined by an apnea-hypopnea index >= 5/h. Results PSGL-1 levels did not differ between controls and OSA patients either in the evening or in the morning. Although, there was no difference between controls (16.9/6.8-40.8 ng/ml) and patients with OSA (19.6/8.4-56.8, p = 0.24), patients with severe OSA had increased plasma P-selectin levels (25.6/8.4-56.8 ng/ml) compared to mild OSA patients (14.1/8.5-35.3 ng/ml, p = 0.006) and controls (p = 0.03). Conclusions P-selectin expression relates to disease severity suggesting a pathophysiological role in endothelial cell activation. PSGL-1 levels are unaltered in OSA, suggesting an alternative activation pathway for P-selectin in OSA

What Is the Nature of Little Red Dots and what Is Not, MIRI SMILES Edition

We study 31 little red dots (LRD) detected by JADES/NIRCam and covered by the SMILES/MIRI survey, of which ∼70% are detected in the two bluest MIRI bands and 40% in redder MIRI filters. The median/quartiles redshifts are z=6.95.97.7 (55% spectroscopic). The spectral slopes flatten in the rest-frame near-infrared, consistent with a 1.6 μm stellar bump but bluer than direct pure emission from active galactic nuclei (AGN) tori. The apparent dominance of stellar emission at these wavelengths for many LRDs expedites stellar mass estimation: the median/quartiles are logM⋆/M⊙=9.49.19.7 . The number density of LRDs is 10−4.0±0.1 Mpc−3, accounting for 14% ± 3% of the global population of galaxies with similar redshifts and masses. The rest-frame near-/mid-infrared (2–4 μm) spectral slope reveals significant amounts of warm dust (bolometric attenuation ∼3–4 mag). Our spectral energy distribution modeling implies the presence of 10 mag. We find a wide variety in the nature of LRDs. However, the best-fitting models for many of them correspond to extremely intense and compact starburst galaxies with mass-weighted ages 5–10 Myr, very efficient in producing dust, with their global energy output dominated by the direct (in the flat rest-frame ultraviolet and optical spectral range) and dust-recycled emission from OB stars with some contribution from an obscured AGN (in the infrared)

Resolving the nature and putative nebular emission of GS9422: an obscured AGN without exotic stars

Understanding the sources that power nebular emission in high-redshift galaxies is fundamentally important not only for shedding light onto the drivers of reionisation, but to constrain stellar populations and the growth of black holes. Here we focus on an individual object, GS9422, a galaxy at $z_{\rm spec}=5.943$ with exquisite data from the JADES and JEMS surveys, including 14-band JWST/NIRCam photometry and deep NIRSpec prism and grating spectroscopy. We map the continuum emission and nebular emission lines across the galaxy on 0.2-kpc scales. GS9422 has been claimed to have nebular-dominated continuum and an extreme stellar population with top-heavy initial mass function. We find clear evidence for different morphologies in the emission lines, the rest-UV and rest-optical continuum emission, demonstrating that the full continuum cannot be dominated by nebular emission. While multiple models reproduce the spectrum reasonably well, our preferred model with a type-2 active galactic nucleus (AGN) and local damped Ly-$\alpha$ (DLA) clouds can explain both the spectrum and the wavelength-dependent morphology. The AGN powers the off-planar nebular emission, giving rise to the Balmer jump and the emission lines, including Ly-$\alpha$, which therefore does not suffer DLA absorption. A central, young stellar component dominates the rest-UV emission and -- together with the DLA clouds -- leads to a spectral turn-over. A disc-like, older stellar component explains the flattened morphology in the rest-optical continuum. We conclude that GS9422 is consistent with being a normal galaxy with an obscured, type-2 AGN -- a simple scenario, without the need for exotic stellar populations.Comment: 19 pages, 13 figures, submitted to MNRAS. Comments welcom