Artykuły naukowe UPP

Displaying 1 - 5 of 92 records

Convolutional neural network model for the qualitative evaluation of geometric shape of carrot root
(Scientific Agricultural Society of Finland, 2024-03-15) Rybacki, Piotr; Sawinska, Zuzanna; Kacániová, Miroslava; Kowalczewski, Przemysław Łukasz; Osuch, Andrzej; Durczak, Karol; Department of Agronomy, Faculty of Agronomy, Horticulture and Bioengineering, Poznan University of Life Sciences, Poznan, Poland; Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Nitra, Slovakia; Department of Food Technology of Plant Origin, Poznań University of Life Sciences, Poznań, Poland; Department of Biosystems Engineering, Faculty of Environmental and Mechanical Engineering, Poznan University of Life Sciences, Poznan, Poland
The main objective of the study is the development of an automatic carrot root classification model, marked as CR-NET, with the use of a Convolutional Neural Network (CNN). CNN with a constant architecture was built, consistingof an alternating arrangement of five Conv2D, MaxPooling2D and Dropout classes, for which in the Python 3.9 programming language a calculation algorithm was developed. It was found that the classification process of the carrot root images was carried out with an accuracy of 89.06%, meaning that 50 images were misclassified. The highest number of 21 erroneously classified photographs were from the extra class, of which 15 to the first class, thus not resulting in significant loss. However, assuming the number of refuse as the classification basis, the model accuracy greatly increases to 98.69%, as only 6 photographs were erroneously assigned.
Attitudes and purchase intentions of Polish university students towards food made from insects - A modelling approach
(2024-03-29) Mikulec, Anna T.; Platta, Anna M.; Radzymińska, Monika; Ruszkowska, Millena; Mikulec, Karolina; Suwała, Grzegorz; Kowalski, Stanisław; Kowalczewski, Przemysław Łukasz; Nowicki, Marcin; Nowicki, Marcin; Faculty of Engineering Sciences, University of Applied Science in Nowy Sącz, Nowy Sącz, Poland; Faculty of Management and Quality Science, Gdynia Maritime University, Gdynia, Poland; Faculty of Economic Sciences, Institute of Management Science and Quality, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland; Graduate of the Warsaw School of Economics, Warszawa, Poland; Department of Food Product Quality, Kraków University of Economics, Kraków, Poland; Faculty of Food Technology, Department of Carbohydrate Technology and Cereal Processing, University of Agriculture in Kraków Poland, Kraków, Poland; Department of Food Technology of Plant Origin, Poznań University of Life Sciences, Poznań, Poland; Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, TN, United States of America
The marketing of insect-derived protein has led to the development of respective legal regulations on such insects-based foods in the European Union. Despite the interest in the area of insect-based food, European researchers have paid relatively little attention to consumer attitudes and behaviors towards such products or the factors that may affect them. Attempts undertaken so far in this respect are insufficient; therefore, there is a need to continue and expand research in this field. The present study attempts to verify the following research hypotheses: H1. Attitudes towards food containing insects are related to the attributes/characteristics of these products, care for health and the natural environment, and attitudes towards novelty (neophilic/neophobic); H2. Intentions to purchase food containing insects can be predicted based on attitudes towards food from insects, product attributes, and attitudes towards environmental health and novelties. An empirical study was conducted among university students (N = 1063) by an indirect interview method using a specially designed questionnaire, via an online platform (Computer-Assisted Web Interview, CAWI) in November 2023. The questionnaire was validated by assessing the construction validity and estimating the reliability of the scales used. The study results demonstrated that the attributes of insect-based food products can influence the positive attitudes towards them and behavioral intentions to consume them, and that the strength of the impact of health quality traits is far greater than that of the organoleptic or functional traits. A negative, statistically significant value of the correlation coefficient between neophobic attitude and intention to purchase this type of food was observed. Thus, respondents without food neophobia were characterized by a positive attitude towards the purchase of foods containing edible insects in their composition.
The Plasma Membrane Purinoreceptor P2K1/DORN1 Is Essential in Stomatal Closure Evoked by Extracellular Diadenosine Tetraphosphate (Ap4A) in Arabidopsis thaliana
(MDPI, 2023-11-24) Dobrogojski, Jędrzej; Nguyen, Van Hai; Kowalska, Joanna; Borek, Sławomir; Pietrowska-Borek, Małgorzata; Department of Biochemistry and Biotechnology, Faculty of Agriculture, Horticulture and Bioengineering, Poznań University of Life Sciences, Poznań, Poland; Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland; Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
Dinucleoside polyphosphates (NpnNs) are considered novel signalling molecules involved in the induction of plant defence mechanisms. However, NpnN signal recognition and transduction are still enigmatic. Therefore, the aim of our research was the identification of the NpnN receptor and signal transduction pathways evoked by these nucleotides. Earlier, we proved that purine and pyrimidine NpnNs differentially affect the phenylpropanoid pathway in Vitis vinifera suspension cultured cells. Here, we report, for the first time, that both diadenosine tetraphosphate (Ap4A) and dicytidine tetraphosphate (Cp4C)-induced stomatal closure in Arabidopsis thaliana. Moreover, we showed that plasma membrane purinoreceptor P2K1/DORN1 (does not respond to nucleotide 1) is essential for Ap4A-induced stomata movements but not for Cp4C. Wild-type Col-0 and the dorn1-3 A. thaliana knockout mutant were used. Examination of the leaf epidermis dorn1-3 mutant provided evidence that P2K1/DORN1 is a part of the signal transduction pathway in stomatal closure evoked by extracellular Ap4A but not by Cp4C. Reactive oxygen species (ROS) are involved in signal transduction caused by Ap4A and Cp4C, leading to stomatal closure. Ap4A induced and Cp4C suppressed the transcriptional response in wild-type plants. Moreover, in dorn1-3 leaves, the effect of Ap4A on gene expression was impaired. The interaction between P2K1/DORN1 and Ap4A leads to changes in the transcription of signalling hubs in signal transduction pathways.
Trace of negative changes in environment recorded in cores of trees growing near busy city roads in Poznań, Poland – dendromonitoring of urban pollution
(Elsevier, 2023-04-02) Budzyńska, Sylwia; Budka, Anna; Edward, Roszyk; Niedzielski, Przemysław; Mleczek, Mirosław; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Chemistry, Poznań, Poland; Poznań University of Life Sciences, Department of Mathematical and Statistical Methods, Poznań, Poland; Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Wood Science and Thermal Techniques, Poznań, Poland; Adam Mickiewicz University in Poznań, Faculty of Chemistry, Poznań, Poland
Dendromonitoring helps answer the question of how polluted cities are and how this pollution will change over the years. However, due to many possible over-interpretations of the obtained results, it is necessary to under stand the deposition processes of pollutants in trees thoroughly. Thus, the aim of this study was to determine the mineral composition of the wood of 3 common deciduous tree species: Norway maple (Acer platanoides L.), silver birch (Betula pendula Roth.), and black poplar (Populus nigra L.) growing near the busiest roads in Poznan, ´ Poland. The research material consisted of core fragments containing the annual increments collected at the breast height of living trees. The content of 22 elements (Al, Ba, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Nd, Ni, Pb, Pr, Rb, Sb, Sr, Ti, Tl, and Zn) in the obtained samples together with the determination of the number of annual increments and density of 3 cm wood fragments were presented. The obtained results indicated an overall in crease in the content of determined elements from the pith to the cambium layer. The range of the examined elements was extensive, and it was not found that one particular species accumulated the most of all the elements. Acer platanoides accumulated the highest concentration of 13 (Ca, Cd, Cu, Fe, K, Mg, Mo, Na, Nd, Ni, Pb, Sr, and Ti), B. pendula of 3 (Ba, Mn, and Zn), and P. nigra of 6 (Al, Cr, Pr, Rb, Sb, and Tl) elements. Despite the growth of individuals of the same species in different parts of the city, a general trend associated with the in crease in the content of most elements was observed. We can assume that the concentration increase indicated in our study reflects the increasing degree of pollution in the urban environment over 30 years.
Advances in Biological Activities and Application of Plant Extracts
(MDPI, 2023-08-17) Kowalczewski, Przemysław Łukasz; Zembrzuska, Joanna; Department of Food Technology of Plant Origin, Poznan University of Life Sciences, Poznan, Poland; Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland

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