Search results for "ISMU"
showing 10 items of 685 documents
N-3 fatty acids modulate antioxidant status in diabetic rats and their macrosomic offspring.
2006
We investigated the role of dietary n-3 polyunsaturated fatty acids (n-3 PUFA) in the modulation of total antioxidant status in streptozotocin (STZ)-induced diabetic rats and their macrosomic offspring. Female wistar rats, fed on control diet or n-3 PUFA diet, were rendered diabetic by administration of five mild doses of STZ on day 5 and were killed on days 12 and 21 of gestation. The macrosomic (MAC) pups were killed at the age of 60 and 90 days. Lipid peroxidation was measured as the concentrations of plasma thiobarbituric acid reactive substances (TBARS), and the total antioxidant status was determined by measuring (i) plasma oxygen radical absorbance capacity (ORAC), (ii) plasma vitami…
Vitamin A Inhibits Doxorubicin-Induced Membrane Lipid Peroxidation in Rat Tissues in Vivo
1993
The antioxidant activity of vitamin A against lipid peroxidation induced by doxorubicin in rat tissues in vivo was investigated. A single ip injection of doxorubicin (30 mg/kg body wt) markedly raised the level of peroxidated lipids measured as TBARS and conjugated dienes in heart and brain membrane preparations. Other tissues, such as retina and liver, did not show any increase of lipid peroxides over control values. Pretreatment of rats with two daily subcutaneous injections of retinol palmitate (0.25 g/kg body wt), for 2 days, before injecting doxorubicin, inhibited peroxidation of heart and brain membrane lipids. The antioxidant action of vitamin A does not appear to be mediated by enha…
Der Spur auf der Spur. Sur les traces de la trace
2016
Hinter dem scheinbar einfachen lexikalischen Gewand der »Spur« verbirgt sich eine überraschende Komplexität: Was ist eigentlich eine Spur? Was sind ihre typischen Merkmale? Wodurch unterscheidet sie sich von Abdruck, Zeichen und Indiz? Die Beiträge des vorliegenden Bandes reflektieren den Spurbegriff aus deutsch-französischer sowie aus interdisziplinärer Perspektive. Zu Wort kommen Philosophie, Literatur, Geschichte, Archäologie, Kunstgeschichte, Urbanistik, Kulturwissenschaft und Psychoanalyse.
Inverse-voltammetric determination of bismuth in biomaterials with computer assisted peak evaluation. part 3. Bismuth determination in wine, grapes a…
1989
The ultra trace element bismuth is regulary found in wine on an average of about 0.1 ppb. Very low bismuth contents were also determined in soil and different biomaterials. In spite of those very low quantities even speciation experiments show results, so far that about 90% of the bismuth in the grapes is water-soluble, resumably as saccharic acids. For detecting such low quantities a very sensitive method of differential pulse anodic stripping voltammetry was developped. The speciation experiments were carried out by fractional extraction.
Flavonols and flavan-3-ols as modulators of xanthine oxidase and manganese superoxide dismutase activity.
2014
Experiments were performed to assess the dose-dependent effects of quercetin, kaempferol, (+) catechin, and (-) epicatechin on superoxide radical production through the modulation of manganese superoxide dismutase and xanthine oxidase activities. The experiments were carried out at flavanoid concentrations ranging from 1 µM to 100 µM. This investigation highlighted that flavonols induced opposite effects on superoxide radical production at different doses, i.e. pro-oxidant at the highest concentration (100 µM) and anti-oxidant at the lowest concentration (1 µM). Similar behaviors were observed for xanthine oxidase with flavan-3ols. The diastereoisomer (the catechin) acted as a stronger radi…
Vascular oxidative stress, nitric oxide and atherosclerosis.
2014
In the vascular wall, reactive oxygen species (ROS) are produced by several enzyme systems including NADPH oxidase, xanthine oxidase, uncoupled endothelial nitric oxide synthase (eNOS) and the mitochondrial electron transport chain. On the other hand, the vasculature is protected by antioxidant enzyme systems, including superoxide dismutases, catalase, glutathione peroxidases and paraoxonases, which detoxify ROS. Cardiovascular risk factors such as hypercholesterolemia, hypertension, and diabetes mellitus enhance ROS generation, resulting in oxidative stress. This leads to oxidative modification of lipoproteins and phospholipids, mechanisms that contribute to atherogenesis. In addition, oxi…
Recombinant hydroperoxide lyase for the production of aroma compounds: Effect of substrate on the yeast Yarrowia lipolytica
2008
International audience; The aim of this study was to investigate the action mechanism of linoleic acid hydroperoxides (HPOD), which are the major substrates of hydroperoxide lyase for the production of flavour compounds, on the yeast Yarrowia lipolytica by evaluating their effect on the oxidative state of the cells. The total antioxidant capacity (TAC) and the activity of the main antioxidant enzymes, such as glutathione reductase, glutathione peroxidase and superoxide dismutase, of cells treated with HPOD were studied. The potential role of intracellular glutathione, including reduced glutathione (GSH) and oxidized glutathione (GSSG), in conferring HPOD resistance was also been examined. T…
Volejbols Latvijas Universitātē
2019
2019. gadā, sagaidot augstskolas 100. jubileju, Latvijas Universitātes Bibliotēka izveidoja virtuālo izstādi “Pēc mirkļa 100 gadi: LU Sports”. Publikācija “Volejbols Latvijas Universitātē” izstrādāta apkopojot šīs izstādes materiālus un veltīta vienam no sporta veidiem – volejbolam. Rakstā atspoguļota volejbola attīstība no LU dibināšanas 1919. gadā līdz 2018.gadam, aprakstot būtiskākos sasniegumus un ievērojamākos sportistus.
Nanostrukturētu bismuta halkogenīdu plānu kārtiņu sintēze un to stabilitātes noteikšana dažādās vidēs
2018
Topoloģiskie izolatori (TI) ir materiāli, kuru virsma ir elektriski vadoša, bet to tilpums ir elektriski izolējošs. Lielākajai daļai topoloģisko izolatoru ir teicamas termoelektriskās īpašības. Tomēr, neskatoties uz pēdējo gadu straujo attīstību topoloģisko izolatoru jomā, TI pielietojumi praktiskās ierīcēs ir salīdzinoši jauna un neizpētīta nozare. Šajā darbā, izmantojot bezkatalizatora fizikālo tvaiku iztvaicēšanu, tika sintezētas planāras, neplanāras un ultraplānas bismuta (III) selenīda un bismuta (III) telurīda plānās kārtiņas. Tika izstrādāta jauna metode ultraplānu (<15 nm) plāno kārtiņu sintēzei. Iegūtās nanostrukturētas plānās kārtiņas, kurām piemīt gan topoloģisko izolatoru, gan i…
Communiquer sur le goût, du discours à la méthode
2013
Based on the original scientific field of taste communication, the article exposes the setting up of a methodology specific to the communication sciences. Explicating the specificity of the taste and using multidisciplinary tools, we build a communication methodology specific to the communication of sensory attribute.