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Wyświetlanie 1-15 z 212
Tytuł:
Kolorymetryczne oznaczanie nadtlenków w tłuszczach za pomocą rodanków żelaza
Kolorimetricheskoe opredelenie perekisejj v zhirakh pri pomoshhi rodanistogo zheleza
Colorimetiric determination of peroxides in fats by the ferric thiocyanate method
Autorzy:
Pietrzyk, C.
Powiązania:
https://bibliotekanauki.pl/articles/873377.pdf
Data publikacji:
1958
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
utlenianie tluszczow
nadtlenki
tluszcze
zawartosc
oznaczanie
metoda kolorymetryczna
metoda jodometryczna
fat oxidation
peroxide
fat
content
colorimetric method
ionometric method
Źródło:
Roczniki Państwowego Zakładu Higieny; 1958, 09, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Znaczenie liczby nadtlenkowej w ocenie olejów jadalnych
Opredelenie perekisnogo chisla pri ocenke rastitel'nykh s'edobnykh masel
The significance of peroxide value in the evaluation of edible oils
Autorzy:
Bronisz, H.
Arbatowska, M.
Leszczynska, H.
Oledzka, R.
Staniszewska, L.
Powiązania:
https://bibliotekanauki.pl/articles/877504.pdf
Data publikacji:
1958
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
oleje jadalne
olej arachidowy
olej sojowy
olej rzepakowy
jelczenie
liczba nadtlenkowa
przechowywanie
zmiany organoleptyczne
edible oil
soybean oil
rapeseed oil
rancidity
peroxide number
storage
organoleptic change
Źródło:
Roczniki Państwowego Zakładu Higieny; 1958, 09, 3
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ kwasu siarkawego na reakcję utleniania kwasu L-askorbinowego przez peroksydazę w obecności nadtlenku wodoru
Vlijanie sernistojj kisloty na reakciju okislenija L-askorbinovojj kisloty dejjspleviem peroksidaza v prisutstvii perekosi vodorosta
Influence of sulfurous acid on oxidation of L-ascorbic acid by peroxidase in the presence of hydrogen peroxide
Autorzy:
Chmielnicka, J.
Powiązania:
https://bibliotekanauki.pl/articles/876744.pdf
Data publikacji:
1963
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
kwas L-askorbinowy
utlenianie
peroksydaza
nadtlenek wodoru
kwas siarkowy
L-ascorbic acid
oxidation
peroxidase
hydrogen peroxide
sulphuric acid
Źródło:
Roczniki Państwowego Zakładu Higieny; 1963, 14, 5
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health benefits of dietary antioxidants
Autorzy:
Bartnikowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1372830.pdf
Data publikacji:
1995
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
beta-carotene
vitamin C
vitamin E
ascorbic acid
heart disease
health benefit
carotenoid
lipid peroxide
free radical
polyphenol
tocopherol
antioxidative enzyme
cancer
dietary antioxidant
Opis:
The sources of free radicals and antioxidant defence systems in living organisms are reviewed. Attention is focused on the role of dietary lipid oxidation products and antioxidants to maintain balance between factors promoting free radical mediated oxidation and the antioxidant defence mechanisms. Particular attention is paid to the influence of intake of vitamins with oxidative properties (vitamin C, vitamin E and ß-carotene) and polyphenols compounds in the prevention of coronary heart disease and cancer.
Źródło:
Polish Journal of Food and Nutrition Sciences; 1995, 04, 4; 3-22
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidant - antioxidant balance in host - parasite relationship
Autorzy:
Hadas, E.
Boczon, K.
Powiązania:
https://bibliotekanauki.pl/articles/841174.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
oxidant-antioxidant balance
enzyme
equilibrium
peroxide
free radical
antioxidant
oxidant
host-parasite relationship
oxidizing-antioxidizing equilibrium
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of nitric radicals on the course of experimental trichinellosis
Autorzy:
Hadas, E.
Derda, M.
Powiązania:
https://bibliotekanauki.pl/articles/837988.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
nitric radical
Trichinella pseudospiralis
Trichinella
trichinellosis
parasitology
peroxide
free radical
Trichinella spiralis
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The response of L5178Y lymphoma sublines to oxidative stress: Antioxidant defence, iron content and nuclear translocation of the p65 subunit of NF-κB.
Autorzy:
Boużyk, Elżbieta
Grądzka, Iwona
Iwaneńko, Teresa
Kruszewski, Marcin
Sochanowicz, Barbara
Szumiel, Irena
Powiązania:
https://bibliotekanauki.pl/articles/1044205.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
iron
L5178Y murine lymphoma sublines
NF-κB
lovastatin
sensitivity to hydrogen peroxide
antioxidant defence
oxidative stress
Opis:
We examined the response to hydrogen peroxide of two L5178Y (LY) sublines which are inversely cross-sensitive to hydrogen peroxide and X-rays: LY-R cells are radioresistant and hydrogen peroxide-sensitive, whereas LY-S cells are radiosensitive and hydrogen peroxide-resistant. Higher initial DNA breaks and higher iron content (potentially active in the Fenton reaction) were found in the hydrogen peroxide sensitive LY-R cells than in the hydrogen peroxide resistant LY-S cells, whereas the antioxidant defence of LY-R cells was weaker. In particular, catalase activity is twofold higher in LY-S than in LY-R cells. The content of monobromobimane-reactive thiols is 54% higher in LY-S than in LY-R cells. In contrast, the activity of glutathione peroxidase (GPx) is about two times higher in LY-R than in LY-S cells; however, upon induction with selenium the activity increases 15.6-fold in LY-R cells and 50.3-fold in LY-S cells. Altogether, the sensitivity difference is related to the iron content, the amount of the initial DNA damage, as well as to the efficiency of the antioxidant defence system. Differential nuclear translocation of p65-NF-κB in LY sublines is due to the more efficient antioxidant defence in LY-S than in LY-R cells.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 881-888
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanism of azide activation of polyphenol oxidase II from tobacco.
Autorzy:
Shi, Chunhua
Liu, Qingliang
Dai, Ya
Xie, Yongshu
Xu, Xiaolong
Powiązania:
https://bibliotekanauki.pl/articles/1043711.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
polyphenol oxidase (PPO)
azide activation
peroxide activation
superoxide activation
copper proteins
Opis:
So far, azide has been consistently reported to act as an inhibitor of metal enzymes, especially copper proteins. The present work shows that azide can also act as an activator of polyphenol oxidase II (PPO II) from tobacco leaves. From0 the square-wave voltammetry of native PPO II, peroxide-PPO II complex and azide-PPO II complex, the reduction of nitro blue tetrazolium by the enzymes and activation of PPO II by peroxide it follows that the binding of azide to PPO II induces the formation of CuO(2)(2-)Cu in the active site of PPO II from CuO(2)(-)Cu in native PPO II. The reason for azide acting as an activator can be attributed to azide complexing with PPO II, thus inducing the formation of CuO(2)(2-)Cu, which is the active site of the peroxide-PPO II complex in which peroxide plays the role of activator.
Źródło:
Acta Biochimica Polonica; 2002, 49, 4; 1029-1035
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Labile iron pool correlates with iron content in the nucleus and the formation of oxidative DNA damage in mouse lymphoma L5178Y cell lines.
Autorzy:
Kruszewski, Marcin
Iwaneńko, Teresa
Powiązania:
https://bibliotekanauki.pl/articles/1043668.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
iron homeostasis
hydrogen peroxide
comet assay
Opis:
Labile iron pool (LIP) constitutes a crossroad of metabolic pathways of iron-containing compounds and is midway between the cellular need for iron, its uptake and storage. In this study we investigated oxidative DNA damage in relation to the labile iron pool in a pair of mouse lymphoma L5178Y (LY) sublines (LY-R and LY-S) differing in sensitivity to hydrogen peroxide. The LY-R cells, which are hydrogen peroxide-sensitive, contain 3 times more labile iron than the hydrogen peroxide-resistant LY-S cells. Using the comet assay, we compared total DNA breakage in the studied cell lines treated with hydrogen peroxide (25 μM for 30 min at 4°C). More DNA damage was found in LY-R cells than in LY-S cells. We also compared the levels of DNA lesions sensitive to specific DNA repair enzymes in both cell lines treated with H2O2. The levels of endonuclease III-sensitive sites and Fapy-DNA glycosylase-sensitive sites were found to be higher in LY-R cells than in LY-S cells. Our data suggest that the sensitivity of LY-R cells to H2O2 is partially caused by the higher yield of oxidative DNA damage, as compared to that in LY-S cells. The critical factor appears to be the availability of transition metal ions that take part in the OH radical-generating Fenton reaction (very likely in the form of LIP).
Źródło:
Acta Biochimica Polonica; 2003, 50, 1; 211-215
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mystery of reactive oxygen species derived from cell respiration.
Autorzy:
Nohl, Hans
Gille, Lars
Staniek, Katrin
Powiązania:
https://bibliotekanauki.pl/articles/1043351.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
hydrogen peroxide
reactive oxygen species
mitochondria
phospholipid membrane
superoxide
bc1 complex
Opis:
Mitochondrial respiration is considered to provide reactive oxygen species (ROS) as byproduct of regular electron transfer. Objections were raised since results obtained with isolated mitochondria are commonly transferred to activities of mitochondria in the living cell. High electrogenic membrane potential was reported to trigger formation of mitochondrial ROS involving complex I and III. Suggested bioenergetic parameters, starting ROS formation, widely change with the isolation mode. ROS detection systems generally applied may be misleading due to possible interactions with membrane constituents or electron carriers. Avoiding these problems no conditions reported to transform mitochondrial respiration to a radical source were confirmed. However, changing the physical membrane state affected the highly susceptible interaction of the ubiquinol/bc1 redox complex such that ROS formation became possible.
Źródło:
Acta Biochimica Polonica; 2004, 51, 1; 223-229
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oxidative stress generation in Taxus baccata leaves affected by Pestalotiopsis funerea under sunny and shaded conditions
Autorzy:
Rybus-Zajac, M
Powiązania:
https://bibliotekanauki.pl/articles/41011.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
oxidative stress
Taxus baccata
leaf
superoxide anion
hydrogen peroxide
superoxide dismutase
yew tree
park
disease symptom
fungal pathogen
Pestalotiopsis funerea
plant defense mechanism
Opis:
In the last few years on old yew trees growing in the parks and gardens extensive disease symptoms were observed on leaves, indicating affection with pathogenic microorganisms. The causal factor was the presence of a fungal pathogen, Pestalotiopsis funerea. Physiological responses involving the oxidative stress, i. e. superoxide anion and hydrogen peroxide levels, and the superoxide dismutase were analyzed as an element of a plant defense mechanism. Diseased leaves from plants growing under sunny and shaded conditions, from May to July, were investigated. The increased generation of superoxide anion-radicals and hydrogen peroxide were observed in the leaves with disease symptoms simultaneously with the activation of superoxide dismutase, which may indicate the induction of host defense response to the P. funerea.
Źródło:
Dendrobiology; 2005, 54; 51-56
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-dependent effect of leptin on renal Na+,K+-ATPase activity
Autorzy:
Marciniak, Andrzej
Jamroz-Wiśniewska, Anna
Borkowska, Ewelina
Bełtowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1041321.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
mitogen-activated protein kinases
leptin
obesity
arterial hypertension
hydrogen peroxide
Na+,K+-ATPase
Opis:
Leptin, secreted by adipose tissue, is involved in the pathogenesis of arterial hypertension, however, the mechanisms through which leptin increases blood pressure are incompletely elucidated. We investigated the effect of leptin, administered for different time periods, on renal Na+,K+-ATPase activity in the rat. Leptin was infused under anesthesia into the abdominal aorta proximally to the renal arteries for 0.5-3 h. Leptin administered at doses of 1 and 10 µg/min per kg for 30 min decreased the Na+,K+-ATPase activity in the renal medulla. This effect disappeared when the hormone was infused for ≥1 h. Leptin infused for 3 h increased the Na+,K+-ATPase activity in the renal cortex and medulla. The stimulatory effect was abolished by a specific inhibitor of Janus kinases (JAKs), tyrphostin AG490, as well as by an NAD(P)H oxidase inhibitor, apocynin. Leptin increased urinary excretion of hydrogen peroxide (H2O2) between 2 and 3 h of infusion. The effect of leptin on renal Na+,K+-ATPase and urinary H2O2 was augmented by a superoxide dismutase mimetic, tempol, and was abolished by catalase. In addition, infusion of H2O2 for 30 min increased the Na+,K+-ATPase activity. Inhibitors of extracellular signal regulated kinases (ERKs), PD98059 or U0126, prevented Na+,K+-ATPase stimulation by leptin and H2O2. These data indicate that leptin, by acting directly within the kidney, has a delayed stimulatory effect on Na+,K+-ATPase, mediated by JAKs, H2O2 and ERKs. This mechanism may contribute to the abnormal renal Na+ handling in diseases associated with chronic hyperleptinemia such as diabetes and obesity.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 803-809
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the methods of the phase transfer catalysis and hydroperoxide in the epoxidation of 1,5,9-cyclododecatriene
Autorzy:
Lewandowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/777869.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
epoksydowanie
1,5,9-cyklododekatrien
kataliza przeniesienia międzyfazowego
nadtlenek wodoru
wodoronadtlenek tert-butylu
epoxidation
1,5,9-cyclododecatriene
phase transfer catalysis
hydrogen peroxide
tert-butyl hydroperoxide
Opis:
The process of the epoxidation of cis,trans,trans- 1,5,9-cyclododecatriene (CDT) to 1.2-epoxy-5,9-cyclododecadiene (ECDD) with the 30% aqueous hydrogen peroxide under the phase transfer conditions and with /tert-butyl hydroperoxide under the homogeneous conditions was investigated. Onium salts such as AliquatŽ 336, ArquadŽ 2HT, methyltrioctylammonium bromide and the Na2WO4/H3PO4 catalyst system are very active under the phase transfer catalysis (PTC) conditions for the selective epoxidation of cis,trans,trans-1,5,9-cyclododecatiene (PTC method). These catalytic systems were found to be as active and selective as the homogeneous phase system Mo(CO)6/TBHP (hydroperoxide method).
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 3; 101-104
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and functional characteristics of two novel members of pathogensis-related multigene family of class 10 from yellow lupine+
Autorzy:
Handschuh, Luiza
Femiak, Iwona
Kasperska, Alina
Figlerowicz, Marek
Sikorski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1040870.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
pathogensis-related genes and proteins
gene silencing
salicylic acid
promoter analysis
yellow lupine
hydrogene peroxide
Opis:
PR-10 proteins (pathogensis-related), ubiquitous within the plant kingdom, are usually encoded by multigene families. To date we have identified 10 homologous pr-10 genes in a yellow lupine cDNA library. Here, the structure and expression of two newly identified yellow lupine pr-10 genes (LlYpr10-2b and LlYpr10-2f) are presented. Many potential regulatory sites were found in both gene promoters including common ones as well as those unique for each gene. However, promoter deletion analysis in transgenic tobacco plants revealed similar patterns of reporter gene (gus) expression. Shortened fragments of both gene promoters studied caused high GUS activity in leaves (along vascular bundles), stamen stigma, anthers and pollen grains. When conjugated with longer LlYpr-10.2 promoter fragments, GUS was additionally present in petal edges. Only a long fragment of the LlYpr10-2b gene promoter caused GUS expression in the stem. In yellow lupine the pr-10.2 genes are present in all studied organs, but their level of expression depends on the stage of development and is affected by wounding, oxidative stress and salicylic acid treatment. Silencing of the Llpr-10.2b gene in 4-week-old yellow lupine plants did not lead to any visible symptoms, which suggests that the function of the silenced gene is supplemented by its close homologues, still present in the studied plants.
Źródło:
Acta Biochimica Polonica; 2007, 54, 4; 783-796
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad zastosowaniem nadtlenku wodoru do unieszkodliwiania siarczkowych ługów zużytych w przemyśle rafineryjnym
Hydrogen peroxide oxidation of refinery alkali spent wastewater
Autorzy:
Kardasz, K.
Kędzierska, E.
Konopka, M.
Wilkanowicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/257314.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
nadtlenek wodoru
ług zużyty
ścieki przemysłowe
przemysł naftowy
hydrogen peroxide
alkali spent
spent caustic
industrial wastewater
petrochemical industry
Opis:
Przeprowadzono badania laboratoryjne nad wykorzystaniem nadtlenku wodoru do oczyszczania próbek przemysłowych uciążliwego odpadu rafineryjnego - ługów zużytych, poddanych wstępnej obróbce przemysłowej, zwanych roboczo mieszaniną poreakcyjną. Za kluczowe zanieczyszczenia uznano związki siarki i fenole. Prowadzono utlenianie w różnych warunkach, by doprowadzić do usunięcia tych dwu grup związków w stopniu umożliwiającym włączenie odpadu do systemu ściekowego. Określono optymalne warunki reakcji, uznano jednak, że korzystne jest pozostawienie mieszaniny po zakończeniu reakcji na kilka godzin w celu pełnego przereagowania zanieczyszczeń z nadtlenkiem wodoru. Po tym czasie uzyskiwano produkt jasny, klarowny i pozbawiony charakterystycznego odoru.
Refinery alkali spent (spent caustic) means the harmful wastewater formed after alkali washing of refinery hydrocarbon streams and containing odorous sulfides, phenolates, carbonates and other salts resulted in the reaction of sodium cation with acidic compounds present in crude oil. The aim of the research was to reduce contaminants to the level that allows leading the wastewater directly to the industrial sewage system with the hydrogen peroxide wet oxidation method. The oxidation was carried out for the so called postreaction mixture obtained after preliminary plant treatment. There were two kinds of the postreaction mixture, one - after being acidified with sulfuric acid (pH 3.5-4); the other one - the postreaction mixture after alkalisation (pH 8.5- -9). Both of the postreaction mixtures were subsequently treated with hydrogen peroxide so as to remove the essential contaminants: odorous sulfur compounds and harmful phenols in the range permitted in the industrial sewerage system. The optimal reaction conditions were established. It was assumed that the result was even better when the reaction mixture was left for a few hours longer to let all the contaminants react completely with hydrogen peroxide. After that time, the postreaction mixture was always light, clear and odourless.
Źródło:
Problemy Eksploatacji; 2008, 2; 73-81
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 212

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