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The practical implementation of precision crop production nowadays is becoming more and more widespread. Numerous experiments and farmers’ practical experiences verify the positive impacts of precision nutrient supply on farming. Precision weed control started to spread later, partly due to technical difficulties, partly to the lack of necessary software support that was developed later. The introduction of a new technology requires complex farm-management decisions, including the consideration of economic correlations (costs-yield-income) as well as high-level skills and significant investments from the farmer. These investments can be returned from the income surplus realized through increasing yields and decreasing farming costs. Extra income can also come from the decreasing material costs which, however, do not necessarily compensate the extra costs of implementing the new technology and depends very much on the utilization of savings from different herbicide doses used for the treatment of plots, considering the soil qualities. This study, utilising the data of a technological experiment carried out in Hungary, presents the results of a stochastic simulation model developed with the adaptation of finite element method. The examination was executed at sub-plot level, dividing the plots into small parcels. Our aim was to examine the impact of precision nutrient application and differentiated spraying of herbicides on production costs and yield, as well as the impact of changes on gross margin (income) and the returns on technological development.

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Apple is one of the most important fruit grown and consumed in the temperate climate region. About 2% of the European population suffers from several allergenic reactions after consumption. Presence of 7 members of Mal d 1 gene family occurring in some apples was examined by PCR. The Mal d 1.01 and 1.02 genes could be detected from 91% and 79% of apple cultivars, respectively, due to the high degree of conservative regions. The Mal d 1.04 gene has 4 functional varieties and 2 pseudo-alleles, so it is highly variable. The PCR amplifi cation with Mal d 1.06 primers gave one or two fragments with different sizes. The electrophoretic pattern is a suitable means to select apple cultivars according to their low, medium, or high Mal d 1 allergen content. Florina apple showed the single 154 bp allele, which is responsible for the small Mal d 1 allergen content in homozygote form..

Several samples gave weak signal or did not give any fragment-band on the gel, so Mal d 1.07 and 1.08 genes might have more varieties. Regarding the Mal d 1.09 gene we have found that it has conservative sequences in different apple cultivars and does not have too many varieties.

Open access

In our investigations the membrane filtration of quality wines (Tokaji Hárslevelű and Egri Bikavér) — based on diafiltration principles, applying nanofiltration membranes — has been studied. For the diafiltration experiments a relatively dense nanofiltration membrane NF 45 has been used, while for simple wine concentrations a membrane developed for organic components rejection NF200 has been investigated. The mixture of the retarded wine compounds was considered the main product of the process. The permeate that crossed the membrane was handled as the by product. Separated wine samples and the original wines have been subjected to gas chromatographic analysis: according to the results the partition of the main components and aroma compounds of the samples was approximately equal between the main and by-product. Membrane separation has been applied in accordance with a “prelaborated” experimental plan, when completing it the effect of operational parameters on the effectiveness of the process has been evaluated and analysed. By mathematical modelling of the phenomenon empirical and quasiempirical relations were set up, and solutions for the practical realization of the procedure were searched for. Our new model describes the filtration efficiency with our new index in the function of the operational parameters’ influence. The significance of the relation is, that the knowledge of the wine-constants might promote the expedient choice of the membrane, which is a primary aspect in planning and creating the process optimal.

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Abstract  

Liquids and solutions containing Mössbauer active isotopes when trapped in the capillaries of porous silicate glasses show the Mössbauer effect1 also at room temperature2,3. A model is given for the explanation of this phenomenon.

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The expression levels of two marker proteins (phosphinotrichin acetyltransferase, PAT and wheat germ agglutinin, WGA) in the transgenic wheat lines and their resistance to digestion in small intestine of rats were studied in comparison with their non-transgenic counterpart obtained from green house and field experiments of two subsequent years. The marker proteins were quantified by ELISA. It was found that the expression of PAT and WGA markedly increased when the wheat was grown in the field compared to that in the greenhouse. There were no significant differences between the WGA contents of the parent and transgenic wheat lines, but a broad range of expression of PAT and WGA was observed in the transgenic lines. PAT did not survive in the small intestine of the rats, while WGA was resistant to digestion in different ratios and was bound to the intestinal epithelium.

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It has been proved that because of the different past of the parcels regarding their soil, agronomical and technological parameters, weed sampling results may not be generalised. Therefore it is necessary to study those solutions how to determine on an acceptable confidence level a parcel’s weed infestation with optimised sampling techniques.For studying the question we have delimited on wheat stubble a total sample area of 36×54 metres (using it as reference) and divided it into 2×2 cells giving a total of 486 sample cells. Then we surveyed the weed infestation and GPS recorded the location of each cell.We have analysed the weed infestation data with mathematical and statistical methods comparing the results of cells with each other and with the total sample area. We found that in several cases of different sample cells weed infestation displayed a diverse picture. This way sampling of weeds is extremely difficult.We found close relation between relative frequency of weeds and sampling accuracy. Therefore sampling is reliable only for surveying the frequent weeds in a parcel, while more rarely found weeds (e.g. spots of perennials) are to be scouted only by means of going over the parcel and GPS recording them. Otherwise, in the case of a traditional sampling process, the number of sampling cells required for acceptable reliability is unnecessarily high.Consequently, it is necessary to further study the economic and cost efficiency aspects of the needed weed sample density from the point of view of reasonable sample density, accuracy and optimal yield.

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Abstract

Enzymatic hydrolysates of mechanically deboned meat (MDM) for a long time have been used as flavouring and functional food ingredients in the food industry and also as the bases of formula foods for special dietary uses.

The aim of the present study was to produce MDM hypo-antigenic products with improved digestibility and high biological value to be used as a milk protein alternative. turkey MDM was treated with digestive enzymes (trypsin and/or α-chymotrypsin, or pancreatin), followed by freeze drying. The optimised reaction conditions of hydrolysis were at 6% (w/v) of meat protein in 0.1% NaHCO3 buffer, pH 7.5; pancreatin enzyme with 50 TAME units/g meat protein substrate, 37 °C and 60 min). Hydrolysates (MDMH) were assessed for degree of hydrolyses (DH, %) by using trinitrobenzenesulphonic acid method and MW distribution by SDS-PAGE. Modification of immune reactive binding sites in MDMHs was monitored by immunoblot with cow’s milk, chicken egg or meat allergic human patients’ sera. Biological value indices (True Digestibility (TD), Net Protein Utilisation (NPU), Biological Value (BV)) were determined using rat feeding trials. Among the MDMH products, the pancreatic hydrolysate proved to be the most favourable in terms of biological value and digestibility as well as hypoallergenic property.

Open access

A stressz szerepe a szocioökonómiai helyzet és a végrehajtó működések közötti kapcsolat szempontjából gyermekkorban

The Role of Stress in the Relationship Between Socioeconomic Status and Executive Functions in Childhood

Magyar Pszichológiai Szemle
Authors:
Réka Kassai
,
Judit Futó
, and
Zsófia K. Takács

Háttér és célkitűzések: A szocioökonómiai szempontból hátrányos helyzetben felnövő gyermekek az élet számos területén, köztük az olyan kognitív készségek fejlődésében is, mint a végrehajtó funkciók mutatnak elmaradást a magasabb társadalmi osztályú családok gyermekeihez képest. Feltételezhető, hogy ezen jelenség hátterében álló egyik mechanizmus az, hogy ezek a gyermekek fokozottabb káros stresszhatásoknak vannak kitéve az életük során. Jelen ta.nulmány célja az volt, hogy magyarországi mintán tanulmányozzuk a szocioökonómiai helyzet egyes komponenseinek és a végrehajtó funkcióknak a kapcsolatát óvodás korú gyermekek esetében, illetve a kortizolhormonszint (mint a stressz indikátora) ezen kapcsolatban játszott szerepét.

Módszer: A kutatás során négy különböző óvodából toboroztunk szocioökonómiai szempontból heterogén mintát. Az elemzéseket 76 résztvevő (45 fiú, 31 lány, életkoruk 52-83 hó, átlag életkoruk 70,85 hó) adatai alapján végeztük: A szocioökonómiai státuszra vonatkozó információkat szülőktől gyűjtöttük kérdőíves módszerrel, a gyerekek végrehajtó funkcióit számítógépen végzett neuropszichológiai tesztekkel (Corsi-kocka, Go/ No-Go, Hearts and Flowers) vizsgáltuk, a gyerekek stresszszintjére pedig a kortizolhormonszintjük (reggeli nyálminta, ELIZA-módszerrel történő elemzés) alapján következtettünk.

Eredmények: Az eredményeink összhangban vannak a korábbi szakirodalmak következtetéseivel, miszerint az általunk mért szocioökonómiai helyzet komponensei közül csak a szülői iskolázottság mutat szignifikáns kapcsolatot a gyermek végrehajtó működéseivel, a csaád bevétele nem. Továbbá a kortizolhormonszint részleges mediáló hatással van ezen változók kapcsolatára.

Következtetések: Megalapozottan feltételezhetjük tehát, hogy a fokozott stressz az egyik tényező, amelyen keresztül a szocioökonómiai helyzet befolyással van a gyermekek kognitív készségeire, azonban további faktorok is meghatározóak lehetnek.

Background: Socioeconomically disadvantaged children lag behind in several areas of life, including the development of cognitive skills like executive functions, as compared to children living in higher social classes. It can be assumed that one ofthe underlying mechanisms behind this phenomenon is that these children are exposed to an increased amount of adverse stress throughout their lives. The aim of the present study was to examine the relationship between the components of socioeconomic status and executive functions in a Hungarian sample of preschool children, and the role ofcortisol hormone levels (as an indicator of stress) in this regard.

Methods: We recruited a socioeconomically diverse sample of children from four different preschools. The analyses reported in the present study were performed based on data from 76 participants (45 male, 31 female, a.ge mnge 52-83 months, mean age 70,85 months). Information regarding the socioeconomic status was collected from parents by questionnaires, children’s executive functions were measured by computerized neuropsychological tests (Corsi Block, Go/No-Go, Hearts and Flowers), and their stress level was assessed by cortisol hormone levels from saliva samples (morning sampling, measured by ELISA method).

Results: Our results are in line with previous findings showing that it is only parental education that has a significant relationship with the executive functions ofchildren, while family income does not. In addition, cortisol hormone levels were found to partially mediate the relationship between parental educational level and children’s executive function capacities.

Conclusions: We can conclude that increased stress is one of the mechanisms through which socioeconomic status influences children’s cognitive skills, but other factors may also be determinants.

Open access

Yellow pea flour contains very low quantity of prolamins, thus it could be a good alternative dietary source for individuals suffering from celiac disease or wheat allergy. Beside emulsifiers, enzymes can be used for developing noodle structure with high quality. Transglutaminase (TG) enzyme was tested in model systems for improving noodle structure by using beneficial cross-linking property of the enzyme. Sensory-and cooking properties and biochemical attributes of proteins were evaluated to characterize structure-function relationships in accordance with the concentration of the applied enzyme. The amount of water and salt soluble protein fractions was reduced meaningfully and the molecular weight distributions assessed by SDS PAGE were changed by addition of 50–200 mg kg −1 TG enzyme. At the same time, sensory properties were improved and high water uptake and low cooking loss were also observed. Forasmuch an increase has been expected in the amount of the cross-linked molecules, the cross-reactivity of prolamins with anti-gliadin antibody was also tested to reduce the risk related to gluten sensitivity. Finally, the possible contamination with wheat was controlled by DNA-based PCR.

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Educatio
Authors:
Áron Szilveszter
,
Réka Kassai
,
Zsófia K. Takács
, and
Judit Futó

Összefoglaló. A COVID–19-vírusjárvány miatt 2020 márciusától júniusáig bevezetett iskolai digitális munkarend az oktatási rendszer minden résztvevőjét számos új feladat elé állította. Feltételezzük, hogy különösen nagy kihívást jelenthetett a hátrányos helyzetű családok számára (Jakab 2020). Jelen tanulmányban egy kérdőíves kutatás eredményeit mutatjuk be, amelyben azt vizsgáltuk, hogy a szocioökonómiai státusz, a háztartási rendezettség, a családi rutin, valamint a gyermek tanulásba tett erőfeszítése közül mely tényezők jelzik előre az iskolai digitális munkarendben a tanulási sikerességet. A mintát középosztálybeli és hátrányos helyzetű, romatelepen élő, alsó tagozatos gyermeket nevelő felnőttek alkották. A hierarchikus lineáris regresszió eredményei azt mutatják, hogy a szocioökonómiai státusz önmagában nem szignifikáns prediktora a tanulási sikerességnek, azonban a tanulási erőfeszítés, a háztartási rendezettség és a családi rutin igen. A fenti eredmények – habár pusztán összefüggéseket és nem feltétlen kauzális kapcsolatokat mutatnak – alátámasztják, hogy hátrányos helyzetű gyermekek feltételezhetően sikeresen támogathatók a távoktatásban való eredményes részvételben egy, a fenti változókat célzó, intervencióval.

Summary. Because of the COVID-19 pandemic, the education system switched to digital distant learning education from March to June 2020. These changes posed a number of new challenges to students, teachers and parents alike. We assume that disadvantaged families were in an even more vulnerable position (Jakab 2020). Thus, we aimed to conduct a study to examine whether and how certain factors, including socioeconomic status, household chaos, family routine, and children’s learning effort affected learning success during this period of homeschooling. The sample consisted of high/middle-class and disadvantaged (living in a Roma settlements) caregivers of 1st–4th grader children. Our results indicate that socioeconomic status alone was not a significant predictor of learning success, however, learning effort, household chaos, and family routine were found to be important predictors. These results – although purely correlational – might suggest that a targeted intervention can be expected to effectively help disadvantaged children adapt to and succeed in a digital distant learning education setting.

Open access