Wyniki wyszukiwania - Biblioteka Nauki

1

Exceptional molecular organization of canthaxanthin in lipid membranes

100%

Sujak A.

Acta Biochimica Polonica

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2012

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tom 59

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nr 1

EN

Canthaxanthin (β,β-carotene 4,4' dione) used widely as a drug or as a food and cosmetic colorant may have some undesirable effects on human health, caused mainly by the formation of crystals in the macula lutea membranes of the retina of an eye. Experiments show the exceptional molecular organization of canthaxanthin and a strong effect of this pigment on the physical properties of lipid membranes. The most striking difference between canthaxanthin and other macular pigments is that the effects of canthaxanthin at a molecular level are observed at much lower concentration of this pigment with respect to lipid (as low as 0.05 mol%). An analysis of the molecular interactions of canthaxanthin showed molecular mechanisms such as: strong van der Waals interactions between the canthaxanthin molecule and the acyl chains of lipids, restrictions to the segmental molecular motion of lipid molecules, modifications of the surface of the lipid membranes, effect on the membrane thermotropic properties and finally interactions based on the formation of the hydrogen bonds. Such interactions can lead to a destabilization of the membrane and loss of membrane compactness. In the case of the retinal vasculature, it can lead to an increase in the permeability of the retinal capillary walls and the development of retinopathy.

2

Exceptional molecular organization of canthaxanthin in lipid membranes

100%

Sujak A.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2011

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tom 53

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nr 1

3

Prof. dr hab. Stanisław Pietruszewski

100%

Sujak A.

Inżynieria Przetwórstwa Spożywczego

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2015

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nr 1

4

Interactions between canthaxanthin and lipid membranes - possible mechanisms of canthaxanthin toxicity

100%

Sujak A.

Cellular and Molecular Biology Letters

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2009

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tom 14

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nr 3

395-410

EN

Canthaxanthin (β, β-carotene 4, 4′ dione) is used widely as a drug or as a food and cosmetic colorant, but it may have some undesirable effects on human health, mainly caused by the formation of crystals in the macula lutea membranes of the retina. This condition is called canthaxanthin retinopathy. It has been shown that this type of dysfunction of the eye is strongly connected with damage to the blood vessels around the place of crystal deposition. This paper is a review of the experimental data supporting the hypothesis that the interactions of canthaxanthin with the lipid membranes and the aggregation of this pigment may be the factors enhancing canthaxanthin toxicity towards the macula vascular system. All the results of the experiments that have been done on model systems such as monolayers of pure canthaxanthin and mixtures of canthaxanthin and lipids, oriented bilayers or liposomes indicate a very strong effect of canthaxanthin on the physical properties of lipid membranes, which may explain its toxic action, which leads to the further development of canthaxanthin retinopathy.

5

Interaction between cadmium, zinc and silver-substituted plastocyanin and cytochrome b6f complex - heavy metals toxicity towards photosynthetic apparatus

100%

Sujak A.

Acta Physiologiae Plantarum

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2005

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tom 27

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nr 1

EN

This paper reports the results of research on the interaction between the cytochrome f of the active cytochrome bf complex (incubated with Cd-, Zn-, and Ag-substituted plastocyanins) and Cu-plastocyanin. The presented studies show, that the metal derivatives of plastocyanin can have an influence on the photosynthetic electron transfer path: cytochrome b6fcomplex - photosystem I. The metal-substituted plastocyanins occupy the plastocyanin electron transfer site of the cytochromef The stopped-flow measurements show, that although the metal derivatives of plastocyanin do not influence the rate of cyt f - Pc electron transfer, creation of the non-electron-transfer complexes characterised by a strong binding between the cyt f and substituted plastocyanins and their slow release, dependent on the redox state of the substituted metal, results in the decrease of a turnover of the cytochrome complex.

6

Evaluation of physical properties of selected vegetable oils obtained by cold pressing

63%

Kachel-Jakubowska M. , Sujak A.

Acta Agrophysica

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2016

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tom 23

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nr 4

EN

The aim of this work was to evaluate the physical properties of oils from winter rape, pumpkin and grape seeds in order to assess their potential as a source of functional oils. Seeds were analysed for water content, protein and fat. All the seeds met minimum requirements for technological quality. The effect of cold oil extraction on chemical compounds was studied in oils pressed from the above seeds. The properties of the oils were compared based on the lipid profiles, content of carotenoids, chlorophylls and tocopherols. The oxidation stability of the oils was estimated through the determination of the acid number, peroxide number and oxidation induction time.

PL

Zamierzeniem pracy było określenie parametrów fizycznych olejów z rzepaku ozimego, dyni i winogron w celu oceny ich potencjału jako źródła olejów funkcjonalnych. Nasiona analizowano na zawartość wody, białka i tłuszczu. Parametry nasion spełniały minimalne wymagania technologiczne. Badano zawartość związków chemicznych uzyskanych z powyższych nasion w olejach tłoczonych na zimno. Właściwości olejów porównano na podstawie zawartości lipidów, karotenoidów, chlorofili i tokoferoli. Stabilność oksydacyjną tych olejów oszacowano przez oznaczenie liczby kwasowej, liczby nadtlenkowej oraz czasu indukcji utleniania.

7

Effect of storing period on the quality of physical and chemical parameters of the industrial winter rape seeds

63%

Kachel-Jakubowska M. , Sujak A.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2011

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tom 11

8

Effect of storage period on physico chemical properties of rapeseeds and oil

63%

Sujak A. , Kachel-Jakubowska M.

Polish Journal of Environmental Studies

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2012

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tom 21

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nr 3

EN

The physicochemical parameters of rapeseeds stored under laboratory conditions for up to 3 years were measured by spectroscopic techniques. Humidity, crude fat, sulphur-containing species in seeds and levels of carotenoids and chlorophylls in oils were assigned. For most of the seeds the minimal technological quality requirements were met. Lipid oxidation products in oils were estimated by the levels of the end products of lipid peroxidation. Interestingly, the oxidation of the lipids was not higher in the oils pressed from older seeds. In conclusion, the material stored for a long period is a valuable product for further processing.

9

Changes to the composition of colorants caused by the temperature of drying rapeseed

51%

Tys J. , Sujak A. , Bogdan A.

International Agrophysics

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2002

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tom 16

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nr 4

307-312

10

Wplyw temperatury suszenia na zawartosc barwnikow w nasionach rzepaku ozimego.

51%

Tys J. , Sujak A. , Rybacki R.

Rośliny Oleiste - Oilseed Crops

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2002

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tom 23

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nr 1

95-102

11

Effect of fertilizer and storage period on oxidative stability and color of rapeseed oils

51%

Kachel-Jakubowska M. , Sujak A. , Krajewska M.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 2

EN

We analysed physical and chemical properties of seeds and oils from different cultivars of winter rapeseeds (‘Markus’, ‘Bios’ and ‘Feliks’) that were cultivated using bio-gas natural manure (digestate) or with a commercially accessible Yara NPK 5014-28 (NPK) fertilizer, both of which were analyzed for element content. Seeds produced without use of fertilizers were taken as control. Prior to cold-pressing of oils, seeds were analyzed for fatty acid content. Cultivar ‘Bios’ breed with use of digestate showed a lower amount of oleic acid (C18:1), while the ‘Feliks’ cultivar had higher content of this fatty acid and lower amounts of linoleic acid (C18:2) as compared to respective controls. In the case of the application of NPK fertilizer, the increase in C18:1 was observed for the cultivars ‘Markus’ and ‘Feliks’. In the latter the decrease in the content of C18:2 was observed as compared to control. The oils were analyzed monthly for photosynthetic pigment content and oxidative stability as well as color during a storage period of three months. Oils contained similar amounts of chlorophylls and carotenoids. Oils derived from seeds produced with the use of commercial NPK fertilizer were characterized with higher oxidation stability (induction time) as compared to digestate. Gradual darkening of the oils was observed. Statistical analysis (p<0.05) showed significant correlation between all the color parameters and term of measurements as well as with the applied fertilizer.

12

Eggshells of Grey Heron (Ardea cinerea) as a tool for bioindication of river valley

51%

Sujak A. , Rymarz M. , Kitowski I.

Current Topics in Biophysics. Supplement

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2013

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tom 36

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nr 2A: Posters

13

Compositional and nutritional values of amaranth seeds after pre-sowing He-Ne laser light and alternating magnetic field treatment

51%

Sujak A. , Dziwulska-Hunek A. , Kornarzynski K.

International Agrophysics

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2009

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tom 23

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nr 1

81-86

14

Effect of electromagnetic stimulation on selected fabaceae plants

51%

Sujak A. , Dziwulska-Hunek A. , Reszczynska E.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 3

EN

The effects of short exposure of seeds of lupine (Lupinus L.) and lucerne (Medicago sativa L.) to a lowfrequency magnetic field (f=50 Hz, B= 30 mT), laser-light radiation (λ = 632.8 nm), and their combination on germination parameters and the content of photosynthetic pigments were examined. Independent studies were done on Petri dishes and in pots. As shown by data, short-term pre-sowing treatment with the physical factors mentioned above in most cases neither influences the germination parameters of the examined plants (no statistical differences between most of the samples) nor produces any negative effects. Generally, an increase in the content of photosynthetic pigments was observed for lupine while no statistically relevant effect of pre-sowing stimulation on lucerne was observed in the laboratory experiment. The pot experiment on lucerne showed statistically relevant differences. Comparing our data and the results obtained by other groups, we conclude that a short-term stimulation of selected Fabaceae with electromagnetic factors does not significantly influence the germination parameters or the content of their photosynthetic pigments. No statistical differences were found between coarse-grained and small-seed plants.

15

Chemical composition and nutritive value of protein of the pea seeds-effect of harvesting year and variety

51%

Kotlarz A. , Sujak A. , Strobel W. , Grzesiak W.

Vegetable Crops Research Bulletin

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2011

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tom 75

16

Laser light stimulation effects on Scorzonera hispanica L. seeds germination, field emergence and photosynthetic pigments content

51%

Dziewulska-Hunek A. , Krawiec M. , Sujak A.

Journal of Horticultural Research

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2016

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tom 24

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nr 1

17

Yield parameters of old and young lucerne plants upon pre-sowing electromagnetic seed stimulation

51%

Cwintal M. , Dziwulska-Hunek A. , Sujak A.

Acta Agrophysica

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2016

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tom 23

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nr 1

EN

Lucerne is a fodder perennial plant from the Fabaceae family grown under field conditions as feed for various groups of animals. This paper is concerned with the effect of electromagnetic stimulation of lucerne seed on the yield, yield parameters, and content of photosynthetic pigments in 1-2- and 5-6- year old lucerne plants. In 2012-2013 a field experiment was conducted with 5-6-year old lucerne, which was initiated in 2008. Another experiment was started in 2012 and conducted on 1-2-year old lucerne. The research material were seeds of hybrid lucerne (Medicago x varia T. Martyn) variety Radius and sowing lucerne (Medicago sativa L.) variety Ulstar. Before sowing the seeds were stimulated with the following combinations of physical factors: C – control (untreated sample), L – laser light with a surface power density of 6 mW cm–2 during 3-fold free fall, F – alternating magnetic field with an induction of 30 mT and exposure time of 30 s; L + F – laser light and magnetic field in the above doses. Electromagnetic stimulation contributed significantly to an increase in the number of shoots per 1 m2 as compared to the control. No significant difference in the weight of a single shoot was observed between the experimental combinations. 5- 6-year old lucerne was characterised by a statistically greater shoot mass as compared with 1-2-year old plants. Statistical analysis showed that the highest yield increase was observed for the samples where seeds were stimulated with laser light and both laser light and magnetic field, relative to the control. The best results concerning concentrations of chlorophyll a and b and carotenoids were observed for alternating magnetic field, where the increase amounted to 9, 11 and 13.0%, respectively, as compared to the control.

PL

Lucerna należy do wieloletnich roślin pastewnych z rodziny bobowatych i uprawiana jest w warunkach polowych na paszę dla różnych grup zwierząt. Niniejsza praca dotyczy wpływu stymulacji elektromagnetycznej nasion lucerny na plon i elementy jego struktury oraz na zawartość barwników fotosyntetycznych w roślinach 1-2 oraz 5-6 letnich. W latach 2012-2013 przeprowadzono doświadczenie polowe z lucerną 5-6 letnią, które założono w 2008 roku i drugie równorzędne założone w 2012 roku z 1-2 letnią. Materiałem badawczym były nasiona lucerny mieszańcowej (Medicago x varia T. Martyn.) odmiany Radius i siewnej (Medicago sativa L.) odmiany Ulstar. Przed siewem nasiona stymulowano w następujących kombinacjach: C – kontrola (bez stymulacji), L – światło lasera o powierzchniowej gęstości mocy 6 mW·cm–2 stosowane 3-krotnie, F – zmienne pole magnetyczne o indukcji 30 mT i czasie ekspozycji 30s; L+F – światło lasera i pole magnetyczne w powyższych dawkach. Stymulacja elektromagnetyczna wpłynęła istotnie statystycznie na wzrost liczby pędów na 1 m2 na tle kontroli. Z kolei nie było istotnych różnic statystycznych w masie pojedynczego pędu. Lucerna 5-6 letnia odznaczała się statystycznie większąmasą pędu w porównaniu z 1-2 letnią. Z analizy statystycznej wynika, iż największy wzrost plonu był w przypadku stymulacji światłem lasera oraz połączonej światłem lasera i polem magnetycznym w stosunku do kontroli. Najlepsze efekty stężenia chlorofili a i b oraz karotenoidów były dla zmiennego pola magnetycznego, gdzie wzrost wyniósł odpowiednio: 9, 11 i 13,0% na tle kontroli.

18

Ocena wpływu pól magnetycznego i elektrycznego oraz wody uzdatnianej magnetycznie na przebieg kiełkowania nasion ślazówki turyngskiej (Lavatera thuringiaca L.)

51%

Kornarzynski K. , Budzen M. , Sujak A.

Acta Scientiarum Polonorum. Technica Agraria

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2015

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tom 14

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nr 1-2

19

Effect of pre-sowing laser treatment of seed on the biomass yield and energy value of Lavatera thuringiaca L. plant

51%

Budzen M. , Sujak A. , Wiacek D.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2016

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tom 16

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nr 4

20

Effect of composition and processing conditions on selected properties of potato-based pellets and microwave-expanded Snacks supplemented with fresh beetroot pulp

51%

Lisiecka K. , Wojtowicz A. , Sujak A.

Polish Journal of Food and Nutrition Sciences

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2021

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tom 71

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nr 2