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Wyświetlanie 1-7 z 7
Tytuł:
Evaluation of soluble oxalates content in infusions of different kinds of tea and coffee available on the Polish market
Ocena zawartości rozpuszczalnych szczawianów w naparach różnych rodzajów herbaty i kawy dostępnych na polskim rynku
Autorzy:
Rusinek, E.
Powiązania:
https://bibliotekanauki.pl/articles/875643.pdf
Data publikacji:
2012
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
oxalate content
tea
coffee
green tea
red tea
black tea
source
infusion
oxalic acid
human nutrition
Opis:
Background. Tea and coffee are the potentially rich source of oxalic acid, which can act as a antinutrient. Objective. The aim of this study was to determine and evaluate the content of soluble oxalates in teas and coffees available on the Polish market. Material and method. The green, red and black teas, and black natural ground and instant coffees were used for preparing the infusions. The manganometric method was used for the determination of the oxalates in the infusions. Results. The mean oxalates content in the infusions from 3 g of black teas was 115.68 mg/100cm3 and was higher as compared to red teas (101.91 mg/100cm3) and green teas (87.64 mg/100cm3). Disregarding the variety of analyzed teas, the largest oxalates content was in infusions of pure one-component tea - “Sir Roger” (164.82-174.22 mg/100cm3), while the lowest oxalates content was noted in the tea containing the components from other plants (“Bio-Active” with grapefruit juice – reaching as low level as 39.00 mg/100cm3). Instant coffees contained larger amount of oxalates than natural ground coffees. Irrespective of the kind of the tested coffees, the lowest oxalates content was found in the infusions from the following coffees: Tchibo Exclusive - 19.62 mg/100cm3, Gala ulubiona - 37.32 mg/100cm3, and Maxwell House - 38.40 mg/100cm3, while the highest oxalates content in instant coffee - Nescafe Espiro 51.80 mg/100cm3. Conclusions. The results revealed a significant relation between phytochemical composition of analyzed teas and coffees and the level of soluble oxalates in infusions prepared from the tested products.
Wprowadzenie. Herbata i kawa stanowią potencjalnie bogate źródło kwasu szczawiowego, który ma działanie antyodżywcze. Cel badań. Celem badań było zbadanie i ocena zawartości rozpuszczalnych szczawianów w naparach z różnych gatunków herbat zielonych, czerwonych i czarnych oraz naturalnych kaw mielonych i rozpuszczalnych dostępnych na polskim rynku. Materiał i metoda. Z herbat zielonej, czerwonej i czarnej oraz kaw naturalnych mielonych i rozpuszczalnych przygotowywano napary. Oznaczenia zawartości rozpuszczalnych szczawianów w naparach wykonywano metodą manganometryczną. Wyniki. Wykazano, że średnia zawartość szczawianów w naparach uzyskanych z 3,0 gramów herbat czarnych (115,68 mg/100 cm3) jest wyższa, w porównaniu do herbat czerwonych (101,91 mg/100 cm3) i herbat zielonych (87,64 mg/100 cm3). Największą zawartość szczawianów zawierały napary z herbat czystych, jednoskładnikowych - „Sir Roger” (164,82- 174,22 mg/100 cm3), natomiast najmniejszą odnotowano w herbacie z komponentem roślinnym („Bio-Active” z sokiem grejpfrutowym - 39,00 mg/100 cm3). Kawy rozpuszczalne zawierały istotnie większą zawartość szczawianów niż naturalne kawy mielone. Najniższą zawartość szczawianów odnotowano w naparach z kaw: Tchibo Exclusive - 19,62 mg/100 cm3, Gala ulubiona - 37,32 mg/100 cm3 i Maxwell House - 38,40 mg/100 cm3, natomiast najwyższą zawartość w kawie rozpuszczalnej Nescafe Espiro - 51,80 mg/100 cm3. Wnioski. Wykazano istotny wpływ składu fitochemicznego badanych próbek herbaty i kawy na zawartość rozpuszczalnych szczawianów w naparach przygotowanych z badanych produktów.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2012, 63, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content of nitratesV and III and heavy metals in selected Brassica vegetables depending on storage
Zawartość azotanów V i III oraz metali ciężkich w wybranych warzywach kapustnych w zależności od czasu przechowywania
Autorzy:
Czech, A.
Rusinek, E.
Powiązania:
https://bibliotekanauki.pl/articles/15867.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The study has been performed to analyze the content of nitrates V and III as well as lead and cadmium in Brassica vegetables, both fresh and after 5-month storage in a cool storeroom. The experimental material consisted of Chinese cabbage, red and white cabbage, savoy cabbage and Brussels sprouts. The content of nitrates in the plant material was determined with the spectrophotometric method based on Griess reaction, whereas concentrations of heavy metals were assayed with the AAS method after dry mineralization. The 5-month storage period was found to decrease (by ca 65±5%) the content of nitrates V in savoy cabbage and Brussels sprouts. In turn, a ca 2-fold increase in the concentration of these compounds was determined in Chinese cabbage, and a similar tendency was observed in white cabbage. Chinese cabbage turned out to be the richest in the analyzed, undesirable elements and compounds, e.g. after storage it was characterized by an exceeded permissible level of nitrates V (750 mg kg–1 f.w.) and by the biggest, ca 10-fold, increase in concentrations of lead and cadmium. Besides, storage was observed to cause a significant increase in the content of nitrates III in the analyzed vegetables, except red cabbage, in which their content was shown to decrease by about 40%. Concentrations of nitrates III and V, Pb2+ and Cd2+ in tissues of the cabbage plants should be monitored regularly in order to prevent their excessive accumulation in the food chain of man.
Celem badań było przeanalizowanie zawartości azotanów V i III oraz ołowiu i kadmu w świeżych warzywach kapustnych i po ich 5-miesięcznym przechowywaniu w chłodnych magazynach. Materiał badawczy stanowiły: kapusta pekińska, kapusta głowiasta czerwona i biała, kapusta włoska oraz kapusta brukselska. W materiale roślinnym zawartość azotanów oznaczono metodą spektrometryczną, opartą na reakcji Griessa, natomiast metale ciężkie – metodą AAS po mineralizacji suchej. Okres 5-miesięcznego przechowania wpłynął na obniżenie (o ok. 65±5%) zawartości azotanów V w główkach kapusty włoskiej i brukselskiej, natomiast ok. 2-krotny wzrost koncentracji tych związków odnotowano w kapuście pekińskiej, podobną tendencję zaobserwowano w przypadku kapusty białej. Kapusta pekińska okazała się warzywem najbardziej skażonym substancjami niepożądanymi, po przechowywaniu bowiem odnotowano przekroczenie (750 mg kg–1 ś.m.) zawartości azotanów V oraz największy, ok. 10-krotny wzrost zawartości ołowiu i kadmu. Przechowywanie spowodowało istotny wzrost zawartości azotanów III w analizowanych warzywach z wyjątkiem kapusty głowiastej czerwonej, w której nastąpił ok. 40% spadek koncentracji omawianych związków. W celu zapobiegania nadmiernemu gromadzeniu się tych związków w łańcuchu pokarmowym człowieka, niezbędne jest regularne monitorowanie azotanów V i III oraz Pb2+ i Cd2+ w tkankach badanych roślin.
Źródło:
Journal of Elementology; 2012, 17, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of a plant preparation Citrosept on selected immunity indices in blood of slaughter turkey hens
Autorzy:
Rusinek-Prystupa, E.
Tatara, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/51897.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction and objective. The objective of this study was to determine the effect of per os administration of 3 various dosages of a Citrosept preparation (a grapefruit extract)to growing turkey hens on changes in their selected haematological and immunological blood indices. An attempt was also undertaken to select the most efficient dose of the preparation with respect to the mentioned indices in turkey hens. Materials and methods. The experiment was conducted on 180 turkey hens allocated at random to 4 groups, 45 birds in each group. Samples of their full blood were analyzed for haematological indices, such as red blood cell count (RBS), haemoglobin content (Hb), haematocrit value (Ht), and white blood cell count (WBC). Samples of blood plasma were assayed to determine the activity of lysozyme (chamber-diffusive method) and heterophils capability to reduce nitro blue tetrazolium (stimulated and spontaneous NBT test). Phagocytic activity of leucocytes against Staphylococcus aureus 209P strain was assessed and expressed as the percentage of phagocytic cells (% PC) and phagocytic index (PI). Results. The administration of the grapefruit extract to turkey hens with drinking water caused a significant increase in haemoglobin content in blood, as well as an increase in non-specific humoral immunity marker (activity of lysozyme) and non-specific cellular immunity marker (percentage of phagocytic cells; P ≤ 0.05). Conclusions. The results obtained enabled the positive evaluation of the advisability of applying the Citrosept preparation in the feeding of turkey hens at the age of 6–9 weeks. Among the doses examined, the most efficient with respect to the stimulation of the non-specific humoral and cellular immunity was the dose of 0.021 ml/kg of body weight.
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Citrosept addition to drinking water and Scutellaria baicalensis root extract on the content of selected mineral elements in blood plasma of turkey hens
Autorzy:
Rusinek-Prystupa, E.
Lechowski, J.
Zukiewicz-Sobczak, W.
Sobczak, P.
Zawislak, K.
Powiązania:
https://bibliotekanauki.pl/articles/49393.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Opis:
The aim of this study was to investigate the influence of Citrosept preparation and Scutellaria baicalensis root extract, administered per os to growing turkey hens in 3 different dosages, on the content of selected mineral elements in blood plasma of slaughter turkey hens. An attempt was also made to specify the most effective dosage of the applied preparations with the highest efficiency regarding increased levels of examined macro- and microelements in the birds’ blood. The research experiment was conducted on 315 turkey hens randomly divided into seven groups, each consisting of 45 turkey hens. Group C constituted the control group without experimental additions of the above-mentioned preparations. In turkey hens in groups II–IV, Citrosept preparation was instilled to water in the following dosages: Group II – 0.011 ml/kg of bm; Group III – 0.021 ml/kg of bm; Group IV – 0.042 ml/kg bm. For birds which belonged to groups V–VII, a preparation of Scutellaria baicalensis root extract was instilled to water in the following dosages: Group V – 0.009 ml/kg of bm; Group VI – 0.018 ml/kg of bm, Group VII – 0.036 ml/kg bm. In the examined plant extracts and blood plasma of the birds the levels of Na, K, Ca, Mg, Cu, Zn, and Fe were identified. The use of examined extracts influenced changes in the levels of all tested elements in slaughter turkey hens’ blood plasma. An upward tendency was recorded in the level of calcium and magnesium, and a downward tendency of sodium, potassium, copper, zinc, and iron in relation to the results achieved in the control group.
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The content of magnesium, calcium, sodium and potassium in infant formulas
Autorzy:
Kwiecień, M.
Winiarska-Mieczan, A.
Samolińska, W.
Kiczorowska, B.
Rusinek-Prystupa, E.
Powiązania:
https://bibliotekanauki.pl/articles/960258.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Mother’s milk is the basic food for infants. Sometimes women for various reasons cannot continue or are not willing to continue breastfeeding their babies and then infant formula provides an alternative. Although breast milk substitutes for infants are produced using high technology methods, their composition is to some extent different than that of breast milk. Breast milk does not contain a high amount of minerals on the overall (ash accounts for circa 0.2 %) but they are characterised by a very high level of assimilability. On the other hand, cow’s milk contains much higher amounts of minerals – ca. 0.7%. Cow’s milk contains 3 to 4 times more Ca, Mg, Na and K than breast milk. The study aimed to analyse infant and baby formulas in terms of the content of Ca, Mg, Na and K. The study covered 11 infant formulas. All the formulas were annotated as “food for particular nutritional uses”. The powdered milk formulas were purchased from retailers in Lublin Voivodeship in August 2014, prior to their best-before dates. The content of Ca, Mg, Na and K was determined by means of flame atomic absorption spectrometry in a Varian SpectrAA 280 FS apparatus. It was found that starter infant formulas contained less of minerals covered by the study than had been declared. It was demonstrated that the content of Ca, Mg, Na and K in the analysed milk samples calculated per 100 kcal was generally comparable to their standard content.
Źródło:
Journal of Elementology; 2017, 22, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutritional value and the content of minerals in eggs produced in large-scale, courtyard and organic systems
Autorzy:
Kiczorowska, B.
Samolinska, W.
Kwiecien, M.
Winiarska-Mieczan, A.
Rusinek-Prystupa, E.
Al-Yasiry, A.R.M.
Powiązania:
https://bibliotekanauki.pl/articles/14352.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
nutritional value
mineral content
mineral element
egg
egg laying
poultry keeping system
courtyard
organic system
Opis:
The aim of this study was to determine the content of basic nutrients as well as selected macroand micro-elements in the albumen and yolk of eggs produced at large-scale, commercial poultry production farms (10) as well as in organic (8) and courtyard farms (12). Ten eggs were randomly collected 3 times on each farm. For chemical analyses, the eggs were hard-boiled for 15 min and then stored at a temp. of 4°C until analyzed. The albumen and yolk of hard-boiled eggs were assessed for the content of dry matter, total protein, crude fat and crude ash, and for their energy value (net Atwater equivalents) as well as the concentrations of K, Na, Ca, Mg, P, Fe, Zn, Cu, Se and Mn. No differences were observed in the content of dry matter, total protein and crude ash. However, differences were demonstrated for the crude fat content, the highest (P < 0.05) level of which was found in eggs from the organic system (higher by 60% in albumen and by 17% in yolk than in the other eggs), which was accompanied by an increased energy value of these eggs. In all the analyzed eggs, similar concentrations were noted for Mg (egg white) and P (egg albumen and yolk). The albumen of eggs from the organic system was characterized by the highest (P < 0.05) content of K, Na, Ca, Zn, Se and Mn. In turn, the albumen of eggs from large-scale commercial poultry production farms contained the highest (P < 0.05) levels of Fe, Cu and Se. Yolks of the eggs from the organic system accumulated the highest (P < 0.05) levels of K, Na, Ca, Mg and Fe. In turn, the highest (P < 0.05) concentrations of Zn, Se and Mn were determined in yolks of the eggs produced in the homestead system, and that of Cu – in yolks of the eggs from large-scale commercial production. A highly positive correlation between concentrations of minerals in the albumen and yolk of the analyzed eggs was reported for the following pairs: K-Na, Se (0.998, 0.93); Na-Na (0.949); Ca-Mg, Mn (0.994, 0.951); Mg-Ca, Mn (0.986, 0.982); P-Ca, Mn (0.997, 0.961); Fe-K, Mg, P, Zn (0.999, 0.937, 0.988, 0.999); Zn-Ca, Mn (0.999, 0.945); Se-Cu (0.971) and Mn-Ca (0.902), whereas a negative correlation for: Ca-Fe, Cu (-0.974, -0.994); Mg-Cu (-0.921); P-Fe (-0.933); Zn-Fe (-0.912); Cu-Na (-0.951); Se-K, P, Zn (-0.960, -0.910, -0.962) and Mn-Se (-0.979).
Źródło:
Journal of Elementology; 2015, 20, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On speeding up nano- and micromechanical calculations for irregular systems with long-range potentials
Autorzy:
Rybarska-Rusinek, L.
Rejwer, E.
Linkov, A.
Powiązania:
https://bibliotekanauki.pl/articles/201034.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nano- and micromechanics
long-range interaction
fast multipole method
cluster intensity
Opis:
Irregular systems with long-range interactions and multiple clusters are considered. The presence of clusters leads to excessive computational complexity of conventional fast multipole methods (FMM), used for modeling systems with large number of DOFs. To overcome the difficulty, a modification of the classical FMM is suggested. It tackles the very cause of the complication by accounting for higher intensity of fields, generated by clusters in upward and especially in downward translations. Numerical examples demonstrate that, in accordance with theoretical estimations, in typical cases the modified FMM significantly reduces the time expense without loss of the accuracy.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 337-344
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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