Showing papers by "Royal Holloway, University of London published in 1971"
TL;DR: In this article, the molecular dynamics algorithm of Verlet was extended to study dense neutral assemblies of charged particles under specified V-T conditions, and the results were obtained for liquid alkali chlorides at 1273°K.
472 citations
95 citations
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68 citations
TL;DR: The methods used failed to reveal significant structural differences between the dextran-like materials produced by cariogenic and non-cariogenic organisms.
39 citations
TL;DR: In this article, the properties of α-galactosidase from mature seeds from various higher plant species have been examined for multiple forms of α. The properties of corresponding forms from Pisum sativum and Vicia faba have been compared.
38 citations
TL;DR: In this paper, the vibrational frequencies of NN' -dimethyl- and N' -diphenylthiourea derivatives have been calculated using quadratic force fields.
30 citations
TL;DR: Eleven growth substances were tested for their bud producing capacity in Funaria hygrometrica and the cytokinins: benzylaminopurine, kinetin and mercaptopurine showed a quantitative relationship while methylaminipurine did not and there existed a linear relationship between reduction in buds and abscisic acid added.
Abstract: Eleven growth substances were tested for their bud producing capacity in Funaria hygrometrica. IAA and gibberellic acid showed no response, neither did inositol, abscisic acid and adenine. The cytokinins: benzylaminopurine, kinetin and mercaptopurine showed a quantitative relationship while methylaminopurine did not. When different amounts of abscisic acid were added together with 10 μg kinetin (which gave maximal production of buds), there existed a linear relationship between reduction in buds and abscisic acid added. Results are obtained in two weeks and it is therefore a fairly quick method for assaying certain cytokinin and also abscisic acid.
28 citations
TL;DR: Several polyhydroxy compounds have been shown to form cationic complexes with copper(II) ions as mentioned in this paper, and paper electrophoresis in copper-II-acetate and basic co
25 citations
21 citations
TL;DR: Methylation studies of the sulphated glucuronoxylofucan from Ascophyllum nodosum have confirmed the highly branched nature of the molecule and the presence of end-group and (1→4)-linked xylose.
18 citations
TL;DR: There was no evidence of one or more carotenoids which were specific to the Compositae although gazaniaxanthin had been shown previously to be restricted to Gazania flowers.
TL;DR: In this article, the authors obtained infrared and Raman spectra (40-3500 cm −1 ) of the compounds and vibrational assignments have been made with the aid of an approximate normal coordinate analysis.
TL;DR: Cladophora rupestris was found to metabolize glucose, fructose, sucrose, and an homologous series of linear oligosaccharides containing (2→1) linked fructose residues attached to the fructose moiety of Sucrose, giving inulin-type polymeric material.
TL;DR: In this paper, the authors used a mode-locked neodymium laser as the intense light source and found that the operating wavelength of this laser, 1.06 µm, is such that a positive result would indicate excitation by three photon absorption.
Abstract: STUDIES of the blue fluorescence generated in solutions of certain organic dyes, for example, cryptocyanine, by the intense emission of a Q-switched ruby laser have demonstrated the two photon nature of the excitation process1,2. A similar fluorescence effect is observed in the pure solvent 1-chloro-naphthalene (CLNP) and attributed to two photon absorption in the tail of the strong band centred near 300 nm1,2. This intensity-dependent absorption is also thought to initiate the strong self-Q-switching effect observed when a cell containing the pure solvent is inserted in the cavity of a ruby laser3. There is no a priori reason to exclude higher order excitation processes if the incident light has the appropriate wavelength and so we have looked for the characteristic fluorescence of CLNP using a mode locked neodymium laser as the intense light source. The operating wavelength of this laser, 1.06 µm, is such that a positive result would indicate excitation by three photon absorption.
TL;DR: Agglutinins to Leptospira have been demonstrated in 18.7 per cent.
Abstract: ummary
Agglutinins to Leptospira have been demonstrated in 18.7 per cent. of fit Thoroughbred horses from training stables in Berkshire and in 21.2 per cent. of fit Thoroughbreds from various parts of Britain. By contrast 65.2 per cent. of sick horses whose symptoms suggested leptospirosis carried agglutinins to the same organisms. In one case leptospirosis has contributed to poor racing performance and its possible significance for the Thoroughbred horse is discussed.
Resume
Sur 18,7 pour cent des Purs Sangs sains provenant du Berkshire et sur 21,2 pour cent des Purs Sangs sains entraines dans differentes regions d'Angleterre on a trouve des agglutinines correspondant aux Leptospires.
En comparaison 65,2 pour cent de Purs Sangs malades et dont la maladie evoquait cliniquement une Leptospirose ont ete trouves porteurs d'agglutinines. Dans un cas la Leptospirose a ete rendue responsable de mauvaises performances et la signification pathologique possible de cette affection pour le Pur Sang est evoquee.
Zusammenfassung
In Rennstallen von Berkshire konnten bei 18.7% der Vollblutern im Training Leptospiren-Agglutinine nachgewiesen werden. In verschiedenen Teilen Englands betrug der Prozentsatz “fitter” Vollbluter mit Leptospiren-Agglutininen 21.2%. Im Gegensatz dazu fanden sich Leptospiren-Agglutinine bei 65.2% kranker Pferde, deren Symptome Leptospirose vermuten liessen. In einem Fall hat Leptospirose zu ungenugenden Rennleistungen beigetragen. Die mogliche Bedeutung dieser Infektion fur das Vollblut wird diskutiert.
Sumario
Aglutinacion a la leptospira ha sido demostrado en 18.7 por ciento de caballos pura sangre “puestos”en entrenamiento en Berkshire y 21.2% procedentes de otros partes de la Gran Bretana. Por contraste el 65.2% de caballos enfer mos cuyos sintomas sugieren Leptospirosis mostraron la aglutinacion. Se sugiere que la baja de un caballo en carreras se debe a leptospira.
TL;DR: In this article, the dependence of phase and modulation depth on the frequency and intensity of an optical signal was examined for the case of transmission by a saturable absorber, and the dependence was shown to be independent of the optical signal phase.
Abstract: The dependence of phase and modulation depth on the frequency and intensity of an optical signal is examined for the case of transmission by a saturable absorber.
01 Jan 1971
TL;DR: Oligosaccharides not previously recorded in the Cladophorales (green algae) have been separated from the 80% ethanolic extract and characterised and 6- O - D -glucosylmaltotriose appear to be common to all the species examined.
TL;DR: Two basically gold-silver alloys were known to the Greeks and Romans: (1) white gold, a haphazard mixture derived from grains of weathered auriferous ore; (2) electrum, an alloy of controlled quality as mentioned in this paper.
Abstract: Two basically gold–silver alloys1 were known to the Greeks and Romans: (1) “white gold”2—a haphazard mixture derived from grains of weathered auriferous ore3; and (2) “electrum”4—an alloy of controlled quality.
TL;DR: In this article, it was shown that polyopolymolybdates present in solutions of pH 3 and 5 are in rapid equilibrium, and that polymorphic guanidinium hexamolybdatoiodate(VII) reacts with periodate to form hexatungstatoiodates.
TL;DR: Using a range of assay systems, the effect of light on the inhibitory properties of several carotenoids were investigated and there was no evidence that the inhibitors obtained by in vitro degradation of 5,6-epoxyxanthophylls play a part in phototropism.
Abstract: Using a range of assay systems, the effect of light on the inhibitory properties of several carotenoids were investigated. The 5,6-epoxyxanthophylls: violaxanthin, neoxanthin and 5,6-monoepoxylutein when illuminated were shown to cause inhibition in the various assays, while a certain amount of inhibition also occurred with the dark treatment. The suggestion that phototropism might be the result of light induced formation of inhibitory compounds was also investigated and there was no evidence that the inhibitors obtained by in vitro degradation of 5,6-epoxyxanthophylls play a part in phototropism.
TL;DR: A recombination coefficient in an argon plasma at atmospheric pressure has been deduced from measurements of the temperature after the application of a pulsed magnetic field to an rf plasma.
TL;DR: In this article, an optical etching technique for producing small optical gratings in which a metallic film is used as a Q-switch for a ruby laser system was described. But this technique is limited to the case of Fig. 1.
Abstract: WE recently described1 an optical etching technique for producing small optical gratings in which a metallic film is used as a Q-switch for a ruby laser system. We have been able to produce line spacings as small as 180 nm using frequency doubled ruby laser radiation in the optical arrangement of Fig. 1; this corresponds to band 13 on Nobert's finest ruled test plate2. With further doubling of the laser light, spacings of order 90 nm should be obtainable.
TL;DR: In this article, standing waves have been observed in an argon positive column and it was deduced that these waves are striations of the type described by Nedospasov.
Abstract: Standing waves have been observed in an argon positive column. From the wave patterns, it is deduced that these waves are striations of the type described by Nedospasov.
TL;DR: Rat liver tissue slices, isolated lysosomes and cultured skin fibroblasts have demonstrated similar elevations of acid alpha-glucosidase activity after incubation with cortisone, and Cortisone-treated human liver tissue, obtained by needle biopsy, also shows an increase in acidalpha-glue activity.
Abstract: Cortisone causes a marked increase in the activity of liver acid α-glucosidase 2h after injection into male Wistar rats. Studies on rat liver tissue slices, isolated lysosomes and cultured skin fibroblasts have demonstrated similar elevations of acid α-glucosidase activity after incubation with cortisone. Cortisone-treated human liver tissue, obtained by needle biopsy, also shows an increase in acid α-glucosidase activity. Neutral α-glucosidase activity was not stimulated by cortisone in vivo or in liver slices.