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    Wyświetlanie 1-9 z 9
    Tytuł:
    Evaluation of the content of phenolic acids and their antioxidant activity in winter cereal seeds
    Autorzy:
    Gałązka, A.
    Gawryjołek, K.
    Żuchowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/963879.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Grains of three cultivars of each cereal: winter wheat (Triticum aestivum L. – Tonacja, Bogatka, Satyna), winter rye (Secale cereae L. – Stanko, Dańkowskie Złote, Amilo) and winter barley (Hordeum sativum L. – Laverola, Mertada, Merk) were examined. In addition, phenolic acids were identified in these grains, and the content of the identified acids, i.e. ferulic, vanillic, p-coumaric, protocatechuic, p-hydroxybenzoic, syringic, sinapic and caffeic, was determined. The antioxidant properties of phenolic acids were examined using the free radical scavenging method against a stable 2.2-diphenyl-1-pikrylhydrazyl radical (DPPH). The antiradical efficiency of phenolic acids depended on the duration of a reaction and genotype-specific properties. The data showed that different winter cereal seed extracts were able to quench 15-47% of DPPH radical solution and to exhibit potent radical scavenging activity. Results of the determinations of the content of phenolic acids in grains of the cultivars correlated with the activity of their extracts. The tested cereal grains were characterized by different levels of the identified phenolic acids, depending on the generic and specific characteristics. Differences in the content of phenolic acids may be subject to genetic traits, environmental factors and different analytical procedures. Cereal kernels with a higher phenolic acid content also exhibited a higher antioxidant activity of extracts with these compounds. Kernels of winter barley cv. Metaxa with a higher content of phenolic acids were also characterized by higher antioxidant activity than those of cvs. Merle and Laverola. The lowest content of phenolic acids was observed in winter rye cv. Stanko. 5-day seedlings showed a statistically significant increase in phenolic acids (ferulic, p-coumaric, protocatechuic, p-syringic, sinapic and caffeic) and the high antioxidant activity. Winter cereal seed extracts were able to quench 15-47% of DPPH radical solution and exhibited potent radical scavenging activity.
    Źródło:
    Journal of Elementology; 2017, 22, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the content of phenolic acids and their antioxidant activity in winter cereal seeds
    Autorzy:
    Gałązka, A.
    Gawryjołek, K.
    Żuchowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190184.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    antioxidant activity
    DPPH·
    early stage germination
    phenolic acids
    winter barley
    winter rye
    winter wheat
    Opis:
    Grains of three cultivars of each cereal: winter wheat (Triticum aestivum L. – Tonacja, Bogatka, Satyna), winter rye (Secale cereae L. – Stanko, Dańkowskie Złote, Amilo) and winter barley (Hordeum sativum L. – Laverola, Mertada, Merk) were examined. In addition, phenolic acids were identified in these grains, and the content of the identified acids, i.e. ferulic, vanillic, p-coumaric, protocatechuic, p-hydroxybenzoic, syringic, sinapic and caffeic, was determined. The antioxidant properties of phenolic acids were examined using the free radical scavenging method against a stable 2.2-diphenyl-1-pikrylhydrazyl radical (DPPH). The antiradical efficiency of phenolic acids depended on the duration of a reaction and genotype-specific properties. The data showed that different winter cereal seed extracts were able to quench 15-47% of DPPH radical solution and to exhibit potent radical scavenging activity. Results of the determinations of the content of phenolic acids in grains of the cultivars correlated with the activity of their extracts. The tested cereal grains were characterized by different levels of the identified phenolic acids, depending on the generic and specific characteristics. Differences in the content of phenolic acids may be subject to genetic traits, environmental factors and different analytical procedures. Cereal kernels with a higher phenolic acid content also exhibited a higher antioxidant activity of extracts with these compounds. Kernels of winter barley cv. Metaxa with a higher content of phenolic acids were also characterized by higher antioxidant activity than those of cvs. Merle and Laverola. The lowest content of phenolic acids was observed in winter rye cv. Stanko. 5-day seedlings showed a statistically significant increase in phenolic acids (ferulic, p-coumaric, protocatechuic, p-syringic, sinapic and caffeic) and the high antioxidant activity. Winter cereal seed extracts were able to quench 15-47% of DPPH radical solution and exhibited potent radical scavenging activity.
    Źródło:
    Journal of Elementology; 2017, 22, 2; 593-605
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pentacyclic triterpenoids and polyphenols accumulation in cell suspension culture of Chaenomeles japonica (Thunb.) Lindl. ex Spach
    Autorzy:
    Kikowska, M.
    Wlodarczyk, A.
    Stochmal, A.
    Zuchowski, J.
    Thiem, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/71498.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    pentacyclic triterpenoid
    triterpenoid
    polyphenol
    accumulation
    cell suspension
    callus
    Chaenomeles japonica
    Japanese quince
    chlorogenic acid
    ursolic acid
    oleanolic acid
    Opis:
    Introduction: Callus and cell suspension cultures are widely applied in investigation of production of highvalue secondary metabolites, which may be used as cosmeceuticals, nutraceuticals and pharmaceuticals. Plant cell cultures are promising alternative to intact plant sources for the production of plant-derived drugs of industrial importance. Objective: The aim of the study was to (i) initiate the cell suspension culture of Chaenomeles japonica from homogenous and uniform callus, (ii) stabilize the selected line and (iii) verify its ability to produce the desired groups of secondary metabolites – pentacyclic triterpenoids and polyphenols. Methods: To establish a cell suspension culture, stabilized and homogeneous callus was selected. Cell cultures were systematically passaged every 2 weeks to fresh liquid medium with the same composition. Biomass from cultures at the growth phase and stationary phase was designated for phytochemical research. UHPLC-DAD-MS analyzes were performed. At the same time, their macroscopic and microscopic observations were carried out. Results: Cells of suspension culture line A2 were characterized by the intense divisions. Cell culture extracts (both from the growth phase and stationary phase) contained pentacyclic triterpenoids. In addition, phenolic compounds (chlorogenic acid and proanthocyanidins type B) and in a small amount also epicatechin are present in the extract of the cells harvested from the growth phase. In the present studies, three pentacyclic triterpenoids were detected and quantified in the extracts of cell suspensions and callus line A2. Ursolic and oleanolic acids were the main triterpenoids in the studied extracts. The cell suspension culture from the growth phase exhibited the highest content of ursolic, oleanolic, and betulinic acid (separately and together). Conclusion: The cell suspension culture of Chaenomeles japonica is a promising source of pentacyclic triterpenoids.
    Źródło:
    Herba Polonica; 2019, 65, 1
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of soil re-oxidation on wheat [Triticum aestivum L.] defense system
    Autorzy:
    Bennicelli, R
    Stepniewska, Z.
    Balakhnina, T.I.
    Stepniewski, W.
    Zuchowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25901.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    superoxide dismutase
    pigment
    carbon dioxide
    malonic dialdehyde
    oxygen diffusion rate
    Triticum aestivum
    oxygen stress
    soil aeration
    wheat
    soil
    atmosphere
    gas transport
    redox potential
    Źródło:
    International Agrophysics; 1999, 13, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of antiamoebic and antimicrobial activities in vitro of Chaenomeles japonica (Thunb.) Lindl. ex Spach extracts
    Autorzy:
    Klikowska, M.
    Derda, M.
    Thiem, B.
    Wlodarczyk, A.
    Dlugaszewska, J.
    Stochmal, A.
    Zuchowski, J.
    Hadas, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2117842.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Acanthamoeba spp.
    chaenomeles japonica
    pentacyclic terpenoids
    plant extracts
    plant
    in vitro cultures
    polyphenols
    staphylococcus aureus
    Opis:
    The free-living Acanthamoeba sp. causes various diseases. Treatment of them is very difficult and not always effective because of encystation, making it highly resistant to antiamoebic drugs. Gram-positive bacteria staphylococcus aureus, Gram-negative bacteria Escherichia coli, and an yeast candida albicans also exhibit outstanding resistance to antimicrobial substances. The search for new natural amoebicidal and antimicrobial agents of plant origin is still of current interest. The aim of the study was to investigate the amoebicidal activity of the extracts obtained from tissue culture and a field-grown plant of chaenomeles japonica against pathogenic trophozoites of Acanthamoeba spp. and antimicrobial effect against s. aureus, E. coli, and c. albicans. The extracts of c. japonica had an inhibitory effect on the proliferation of Acanthamoeba trophozoites as compared to the non-treated control. among the crude extracts tested, the extract of leaves, from both shoot culture and the field-grown plant had remarkable amoebicidal action against the trophozoites but also antibacterial activity against Gram-positive bacteria staphylococcus aureus. The extract from leaves from shoot culture, already on the second and third days of treatment, showed an antiamoebicidal effect at a concentration of 1 mg ml-1 (inhibi- tion of trophozoites 87.5% and 91.8%, respectively). In addition to leaves from shoot culture (a conc. 5 mg ml-1, 2nd day inhibition of trophozoites 85.7% and 3rd day 97.2%), leaves from a field-grown plant (a conc. 5 mg ml-1, 2nd day 91.0% and 3rd day 94.4%) and callus (a conc. 5 mg ml-1, 2nd day 90.0% and 3rd day – 95.4%) also exhib- ited a good antiamoebicidal activity. Out of the four extracts, the extracts from leaves from both shoot culture and a field-grown plant were reported to be the most active against Gram-positive s. aureus, which was determined by the values of MIC = 5.0 mg ml-1 and MIC = 2.5 mg ml-1, respectively. The inhibitory potential depends on the yield and composition of mainly bioactive compounds: pentacyclic terpenoids (mainly betulinic, ursolic, and oleanolic acids) and polyphenols (mainly chlorogenic acid and its isomers, epicatechin, dimeric, and trimeric proanthocyanidins, quercetin and kaempferol derivatives).
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2019, 61, 2; 47-58
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of properties of operation of the supporting equipment for the seat belts
    Autorzy:
    Żuchowski, A.
    Jackowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/242023.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    vehicle safety
    crash tests
    safety belt
    pretensioner
    force limiter
    Opis:
    Applying the pretensioners and the belt force limiters in cars had a positive impact on the seat belts effectiveness in protecting the people driving against the effects of collisions. In this way, delayed action of the seat belts, resulting from the flexibility of the belt and the operating time of the retractor locking mechanism, was partially eliminated. The tasks and properties of the pretensioners and force limiters used in cars will be described in the paper. Implementations of the forces acting at the driver's lap belts and shoulder belts during a frontal collision into a rigid barrier, at the speed of 56km/h, will be presented. On this basis the properties of the pretensioners and belt force limiters will be determined. The characteristics of rigidity (force - displacement) of the shoulder belts of various designs will be presented, too. On the basis of the results of the crash tests (NHTSA, USA) for several cars the dynamic loads, which act on the driver during a frontal collision into a rigid barrier, will be analysed. The biomechanical indices of the human immune to the effects of shock loads will be taken into account. The analysis will include the passenger cars (sedan) from the years 1995 – 2004, which were fitted with the seat belts of various designs.
    Źródło:
    Journal of KONES; 2011, 18, 1; 697-704
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the pre-tightening of seat belts on the loads acting on rear seat occupants during a frontal collision
    Wpływ wstępnego napięcia pasów bezpieczeństwa na obciążenia pasażerów na tylnych siedzeniach podczas zderzenia czołowego
    Autorzy:
    Żuchowski, A.
    Wicher, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/263317.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    vehicle safety
    seat belts
    rear seat passengers
    bezpieczeństwo pojazdu
    pasy bezpieczeństwa
    pasażerowie na tylnych siedzeniach
    Opis:
    Results of investigations of the dynamic loads acting on the occupants of backseats in a passenger car during a frontal collision and an analysis of such loads have been presented. The analysis was based on results of experimental tests carried out on a crash-test stand at the Automotive Industry Institute (PIMOT). It was focused on the influence of the pre-tightening of seat belts on the state of loading of test dummies representing a 50 centile male (M50) and a child aged about 10 years. The child dummy was placed in a child safety seat (which included both a seat cushion and a backrest), designed for children with a mass of 15 to 36 kg. The dummies were restrained with the use of standard seat belts. The quantities taken into consideration included head and thorax accelerations measured for both dummies and, for the M50 dummy, forces and moments acting on the neck, thoracic deflection, and axial forces in the thighs. In the analysis, results of three crash tests with different seat belt pre-tightening force values were taken into account. To estimate the risk of injury, indicators of biomechanical immunity of the human body to the effects of impact loads were used. Conclusions drawn from a frame-by-frame analysis of films recorded by means of high-speed cameras were also taken into consideration at this work. The benefits of adequate pre-tightening of seat belts by the user, especially by seat belt pretensioners, were confirmed. In the case of seat belts with pretensioners, the risk of severe injury to an adult passenger (AIS4+) was estimated at 18%, i.e. about a half of that incurred when seat belts without pretensioners are used. For a child, the pretensioners were found to reduce this risk to 9%, i.e. to about one-third.
    W pracy przedstawiono wyniki badań i analizę obciążeń dynamicznych, jakie działają na osoby na tylnych siedzeniach w samochodzie osobowym, podczas zderzenia czołowego. Analiza została przeprowadzona na podstawie rezultatów badań eksperymentalnych, przeprowadzonych na stanowisku zderzeniowym w Przemysłowym Instytucie Motoryzacji. Uwagę skupiono na wpływie wstępnego napięcia pasów na stan obciążenia manekina reprezentującego 50-centylowego mężczyznę (M50) oraz manekina dziecka w wieku około 10 lat. Manekin dziecka siedział w foteliku samochodowym (podstawka z oparciem), przystosowanym dla dzieci o masie 15÷36 kg. Manekiny przypięte były za pomocą standardowych pasów bezpieczeństwa. Rozważono przyspieszenie działające na głowę i klatkę piersiową obu manekinów oraz siły i momenty działające na szyję, ugięcie klatki piersiowej oraz siły osiowe w udach manekina M50. W analizie zostały wykorzystane wyniki trzech prób zderzeniowych, w których pasy bezpieczeństwa były wstępnie napięte siłami o różnych wartościach. Do oceny ryzyka obrażeń wykorzystano wskaźniki biomechanicznej odporności ciała człowieka na skutki obciążeń udarowych. Podczas analizy wykorzystano także wnioski z analizy poklatkowej filmów nagranych za pomocą kamer do zdjęć szybkich. Potwierdzono korzyści wynikające ze wstępnego napięcia pasów bezpieczeństwa przez użytkownika, a zwłaszcza przez napinacze. Oceniono, że po zastosowaniu napinacza ryzyko ciężkich obrażeń dorosłego pasażera (AIS4+) jest około dwa razy mniejsze (18 %) niż w samochodzie bez napinaczy. W przypadku dziecka jest to 9 %, czyli trzykrotnie mniej niż z pasami bez napinaczy.
    Źródło:
    Archiwum Motoryzacji; 2013, 2; 93-110, 209-226
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Sound Absorption of Road Acoustic Screens Under Simulated Weathering
    Autorzy:
    Nowoświat, A.
    Bochen, J.
    Dulak, L.
    Żuchowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/176782.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic screens
    ageing process
    sound absorption
    durability
    Opis:
    The present paper is comparing the results of research studies carried out for three road acoustic screens of different design and different number of damping layers. For the tests, we selected timber or steel screens with a traditional multilayer structure and also one innovative type of simplified design. With respect to particular panels, their sound absorption properties were investigated in the reverberation chamber after they had been subjected to simulated weathering. In the process, two screens were subjected to the aging tests of 50-500 cycles in a special climatic chamber, and the innovative screens were subjected to 1000 cycles. The procedure was repeated every 50 or 100 cycles in order to obtain the changes of acoustic characteristics. The changes taking place in the absorbing material were also investigated with the use of scanning electron microscopy method (SEM). Basing on the obtained results and on the statistical analysis, the capability to maintain acoustic properties by the panels during their service life in natural conditions was estimated. For that purpose, linear statistical models were worked out, which were then applied to estimate the value of the single number sound absorption coefficient after successive aging cycles as well as the predicted time periods of acoustic class changes.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 323-337
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of customers’ preferences in the aspect of modernization or formation of distribution channels of organic products
    Analiza preferencji klientów w aspekcie modernizacji lub tworzenia kanałów dystrybucji produktów ekologicznych
    Autorzy:
    Obrzut, J.
    Olech, E.
    Kuboń, M.
    Kaczmar, I.
    Borusiewicz, A.
    Żuchowski, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/28811478.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Źródło:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki; 2021, 6[2]; 33-47
    2450-8055
    Pojawia się w:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Ekonomika i Organizacja Logistyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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