Search results for "YRE"
showing 10 items of 1025 documents
[The in vitro effect of the addition of ion exchange resins on the bioavailability of electrolytes in artificial enteral feeding formulas].
2008
Objective: To determine in vitro free ion concentration in 3 standard artificial enteral feeding formulas following the addition of ion exchange resins. Method: Three standard types of AEF were chosen: Osmolite HN®, Nutrison Standard®, and Isosource Standard®. The ion exchange resins used were: sodium polystyrene sulfonate and calcium polystyrene sulfonate. In a beaker were mixed 100 mL of AEF with 1.5 g or 3 g of ion exchange resins for 48 hours at 37oC. Subsequently, the samples were precipitated and the supernatant obtained was used for determining the concentrations of calcium, magnesium, sodium, and potassium ions. Results: The addition of sodium polystyrene sulfonate to different type…
ChemInform Abstract: Covalently Supported Ionic Liquid Phases: An Advanced Class of Recyclable Catalytic Systems
2016
In this review, the most recent advances in the synthesis and catalytic applications of covalently supported ionic liquid (IL) phases will be discussed. This class of recyclable catalytic materials is based on the covalent attachment of several types of ammonium salts, usually imidazolium, but also thiazolium, triazolium, and pyrrolidinium salts, on the surface of different supports, for example, silica, periodic mesoporous organosilica, polystyrene, magnetic-based materials, carbon nanotubes (NTs), halloysite NTs, polyhedral oligomeric silsesquioxane (POSS), and fullerenes. Moreover, poly(ionic liquid) materials, in which the IL-based structure also acts as a support, will be considered. T…
Efficacy of spot form of net blotch suppression in barley from seed, fertiliser and foliar applied fungicides
2022
Abstract Spot form of net blotch (SFNB), caused by Pyrenophora teres f. maculata is a prevalent and damaging foliar disease of barley (Hordeum vulgare). Fungicides are commonly used to manage SFNB infection and reduce production loss in susceptible varieties. This study determined the efficacy of suppression of SFNB and associated grain yield and quality improvements from application of fungicides to seed, fertiliser and/or foliar treatments. Eight field experiments were conducted in south-eastern Australia during 2016–2018. Two experiments compared single applications of different commercially available seed, fertiliser and foliar fungicides. Six experiments evaluated different growth stag…
Analysis of Chemical and Biochemical Parameters of Petrol-Contaminated Soil after Biostimulation with an Enzyme Reagent
2020
This study aimed to assess the effect of petrol and the Fyre Zyme reagent on selected chemical and biochemical properties of loamy sand. The experiment was conducted under laboratory conditions. First, petrol was introduced into the soil at doses of 0 and 50 g k-1dry matter (DM). Next, 6% Fyre-Zyme enzyme reagent solution was added to the samples contaminated and uncontaminated with petrol, in the following combinations: 0 (control), once at 40 cm3 kg&ndash
Solution properties of polyelectrolytes. III. Effect of sodium polystyrene sulfonate concentration on viscometric and size exclusion chromatographic …
1988
The effect of sodium polystyrene sulfonate concentration on the shape of its molecules in aqueous solution at different NaNO3 ionic strengths has been analyzed by viscometry and size-exclusion chromatography (s.e.c). An equation has been developed which predicts the intrinsic viscosity, [η] p.cp.cs, at finite concentration of both polyion (cp) and electrolyte (cs). The experimental results obtained by both techniques can be accounted for in terms of the theory. Several factors involved in the elution mechanism have been considered and the variation of the slopes of s.e.c. calibration curves with cp and cs has been discussed in terms of polyion conformation changes.
Solution properties of polyelectrolytes. I. Exclusion chromatography of sodium polystyrene sulphonate in salt-free water as eluent
1987
The effect of concentration of sodium polystyrene sulphonate on the elution volume in exclusion chromatography has been investigated using salt-free water as eluent. A non-linear increase in the elution volume has been observed with increasing injected sample concentration. Concentration-dependent calibrations have been obtained which approach the universal calibration for uncharged polymers (dextrans) as polyelectrolyte concentration increases. The separation mechanisms are interpreted in terms of electrostatic and hydrodynamic interactions. A semi-empirical model is proposed to predict concentration effects of linear polyions in exclusion chromatography and good agreement has been found b…
Zur Gelpermeationschromatographie in organischen Lösungsmitteln
1965
Die Gelpermeationschromatographie hat sich vor allem mittels der Sephadexgele fur die Trennung polymerhomologer wasserloslicher Makromolekule als sehr erfolgreich erwiesen. Die Trennung nur in organischen Losungsmitteln loslicher Polymerer ist erst in jungster Zeit gelungen, wobei vernetzte Polystyrol-, Polymethacrylat- und Dextranderivatgele benutzt werden. Der Mechanismus dieses chromatographischen Prozesses wird untersucht. Ein Vergleich dieses Vorganges, bei dem das Polymere nur in einer Phase vorliegt, mit den klassischen Methoden, die mit Auftrennung in zwei Phasen arbeiten, wird durchgefuhrt. Insbesondere werden die Methoden der Dreiecks-Fallungsfraktionierung, der Kolonnentechnik mi…
Disproportionierung und Kombination als Abbruchsmechanismen bei der radikalischen Polymerisation von Styrol, 2. Analyse der temperaturabhängigkeiten
1975
Styrol wurde in Substanz mit 14C-markiertem 2,2′-Azoisobutyronitril im Temperatur-bereich von 30 bis 80°C polymerisiert. Aus der Polymerisationsgeschwindigkeit und der Anzahl der radioaktiven Endgruppen im Polymeren wurden die Effektivitat des Starters f und die Verhaltnisse der Geschwindigkeitskonstanten fur Wachstum, Abbruch und Start k/ka und ka, PR/(kwkst) berechnet. Die Bestimmung der Molekulargewichtsverteilungen mit Hilfe der Gelpermeationschromatographie ermoglichte es, die Ubertragungskonstante CM und das Verhaltnis ka, disp/ka, comb zu berechnen. Die Temperaturabhangigkeiten der Geschwindigkeitskonstanten erwiesen sich als physikalisch sinnvoll. Styrene was bulk polymerised by ini…
Disproportionierung und kombination als abbruchmechanismen bei der radikalischen polymerisation von styrol, 1.Versuche mit 14C-markierten 2,2′-azoiso…
1975
Die Substanzpolymerisation von Styrol mit 14C-markiertem 2,2′-Azoisobutyronitril (AIBN) wurde bei 52°C experimentell untersucht. Die Polymerisation wurde dilatometrisch verfolgt, die Molekulargewichte der entstandenen Polymeren viskosimetrisch ermit-telt, der Gewichtsbruch der einkettigen Molekule gelchromatographisch bestimmt und die Anzahl der markierten Endgruppen ausgezahlt. Die eingehende kinetische Analyse erhartet die neueren Erkenntnisse uber den Abbruchmechanismus. Danach liegt bei der Polymerisation von Styrol neben der Kombination auch Disproportionierung vor. Bulk polymerisation of styrene initiated by 14C-labelled 2,2′-azoisobutyronitrile (AIBN) was studied at 52°C. The polymer…
DNA Modification Induced After Metabolic Activation of the Potent Carcinogen Dibenzo[a, l]pyrene in V79 Chinese Hamster Cells Stably Expressing Singl…
2000
Abstract The polycyclic aromatic hydrocarbon (PAH) dibenzo[a, l]pyrene (DB[a, l]P) has been found to be an environmental pollutant and, considering the available data from rodent bioassays, it represents the most carcinogenic member compound of the class of PAH yet discovered. To sort out the contribution of individual cytochromes P450 (P450) in the metabolic activation of this PAH, V79 cells stably expressing a single P450 isoform were treated with DB[a, l]P or enantiomeric DB[a, l]P-11,12-dihydrodiols (diols). Subsequent analysis of the DNA adducts formed revealed substantial differences in the adduct pattern and the total DNA binding depending on the cell line used. Human P450 1B1 effect…