Search results for "Phenol red"
showing 7 items of 7 documents
Partial vinylphenol reductase purification and characterization from Brettanomyces bruxellensis
2008
International audience; Brettanomyces is the major microbial cause for wine spoilage worldwide and causes significant economic losses. The reasons are the production of ethylphenols that lead to an unpleasant taint described as 'phenolic odour'. Despite its economic importance, Brettanomyces has remained poorly studied at the metabolic level. The origin of the ethylphenol results from the conversion of vinylphenols in ethylphenol by Brettanomyces hydroxycinnamate decarboxylase. However, no information is available on the vinylphenol reductase responsible for the conversion of vinylphenols in ethylphenols. In this study, a vinylphenol reductase was partially purified from Brettanomyces bruxe…
Die klinische Bedeutung des Phenolrottests
1959
Es wurde uberpruft, ob dem als klinisches Routineverfahren in der Nierendiagnostik verwandtem Phenolrottest spezielle Bedeutung fur die Feststellung eines tubularen Funktionsausfalls zukommt. Bei Vergleichsuntersuchungen an 45 Nieren- und Hochdruckkranken, in denen das Ergebnis des Phenolrottests mit dem Ausscheidungsmaximum fur PAH (Tm-PAH) als exakt erfasbarer tubularer Funktionsgrose verglichen wurde, ergab sich nur in einem Drittel der Falle eine befriedigende Ubereinstimmung. Dies hangt vermutlich teilweise damit zusammen, das die Eliminierung der relativ geringen Farbstoffmenge fur die Kanalchenzellen keine eigentliche Belastung darstellt.
Standard addition method in FIA. Comparison between different assemblies
1999
A comparison between the different proposed methods to perform the standard addition in an on-line way (flow injection analysis) is made. The different assemblies (reverse and conventional FIA) and the employed standards in every method are compared. Three analyses were carried out, two of them were analyses of samples of pH indicators (methylorange and chlorophenol red) prepared at an acid pH, while the standards were prepared at a basic pH. The third analysis was the analysis of chloride in different synthetic waters with a perfectly known composition for all the ions present in the samples. Besides a new method to perform the on-line standard addition is proposed, trying to reduce the co…
Detection and correction of interferences in spectroscopy techniques
2001
By combining the apparent content curves method and the Youden method, we have developed a strategy for detecting constant and proportional errors in spectroscopy techniques. A method for elimination of spectral interferences (different of blank) is also proposed. To apply of this method there must be a matrix effect that varies with the amount of sample or a simulated matrix effect provided working under different experimental conditions that induce a variation of the analytical signal of the analyte. The proposed procedures have been applied to the determination of methyl orange in presence of phenol red, bromothymol blue and bromocresol purple.
Tear production and intraocular pressure values in clinically normal eyes of whooper swans (Cygnus cygnus)
2018
The objective of this study was to determine the normal range of tear production and values of intraocular pressure (IOP) in clinically normal eyes of whooper swans (Cygnus cygnus). A total of 86 birds: 81 cygnets (6-10 weeks old) and 5 moulting – adult swans (3-6 years old) were examined in this study. Both eyes of all birds underwent a complete ophthalmic examination, including evaluation of tear production with the phenol red thread test (PRTT) and the assessment of the IOP by rebound tonometry, employing the TonoVet® device. The mean ± standard deviation of PRTT values were as follows: all cygnets (81) 22.59±3.48 mm/15s, male cygnets (45) 22.64±3.54 mm/15s, female cygnets (36) 22.53±3.4…
Effect of Bisacodyl on Intestinal Electrolyte and Water Net Transport and Transit
1987
The effect of bisacodyl on intestinal electrolyte, glucose, and water transport, and transit was studied in 6 healthy volunteers by intestinal perfusion. A 5-lumen tube with an occluding balloon allowed constant perfusion (10 ml/min) of 30 cm of the upper jejunum and a rapid collection of the perfusate free of contaminants. A phenol red bolus was injected into the tube and its passage through the test segment was calculated by dye dilution formula. A 1-hour control period was followed by a test period with 6 mg/h bisacodyl and followed by 2 other 1-hour control periods. Net absorption of Na+ (0.35 +/- 0.08 mmol/min) and water (1.7 +/- 0.6 ml/min) changed to net secretion (Na+ -0.93 +/- 0.3 …
Haloperoxidase Mimicry by CeO2−xNanorods Combats Biofouling
2016
CeO2-x nanorods are functional mimics of natural haloperoxidases. They catalyze the oxidative bromination of phenol red to bromophenol blue and of natural signaling molecules involved in bacterial quorum sensing. Laboratory and field tests with paint formulations containing 2 wt% of CeO2-x nanorods show a reduction in biofouling comparable to Cu2 O, the most typical biocidal pigment.