Showing papers by "Bedford College published in 1959"
01 Nov 1959
TL;DR: In this article, measurements of the susceptibility of Bi2 Te3 over the temperature range 100°K to 600°K, with magnetic field parallel (χparallel) and perpendicular to the c axis, are reported, and contributions to the susceptibility from the core and valence electrons, free carriers and impurities are discussed.
Abstract: Measurements of the susceptibility of Bi2 Te3 over the temperature range 100°K to 600°K, with magnetic field parallel (χparallel) and perpendicular (χperpendicular) to the c axis, are reported. Bi2 Te3 is diamagnetic and χparallel has the larger algebraic value. The contributions to the susceptibility from the core and valence electrons, free carriers and impurities are discussed, and it is suggested that the effect of the impurities is negligible, the free carriers give rise to a paramagnetic contribution and the main contribution is from the core and valence electrons.
26 citations
TL;DR: Convolute bedding from the Lower Ludlovian in north-eastern Radnorshire in calcareous siltstones probably of the Monograptus tumescenszone is described in this article.
Abstract: Convolute bedding is described from the Lower Ludlovian in north-eastern Radnorshire in calcareous siltstones probably of the Monograptus tumescenszone. Examples of true slump-structures from the same area are given for comparison. The mode of formation of the convolute bedding is discussed and reference made to such directional information as is available from a study of the sediments.
23 citations
16 citations
01 Apr 1959
TL;DR: In this paper, the internal resonance of nickel over the temperature range 5°-100°c was investigated and it was shown that the resonance is due to the internal magnetic field associated with the anisotropy energy.
Abstract: The internal resonance, revealed by measurements of the complex permeability, has been investigated in nickel over the temperature range 5°-100°c. The resonant frequency is found to be a decreasing function of temperature and, over the range studied, the variation is roughly from 450 to 300 Mc/s in the case of a polycrystalline disc, and from 270 to 40 Mc/s in the case of a colloidal suspension of nickel particles. This behaviour is consistent with the view that the resonance is due to the internal magnetic field associated with the anisotropy energy and a quantitative interpretation is attempted using the available experimental values for the anisotropy constants.
14 citations
TL;DR: CladocERA are often coloured red by hæmoglobin in their blood; another red pigment has been found in specimens infected by Spirobacillus cienkowskii which Metchnikoff described from Daphnia magna Straus.
Abstract: CLADOCERA are often coloured red by haemoglobin in their blood1; another red pigment has been found in specimens infected by Spirobacillus cienkowskii which Metchnikoff2 described from Daphnia magna Straus. The bacterium passes through a series of stages within the cladoceran and causes it to assume a bright red colour.
13 citations
TL;DR: Fungal strains grouped together on the bais of similar physiological reactions have been found to cut right across species of diverse taxonomie affinities, and in such disciplines as clinical medicine, agriculture, and forest pathology, the strain rather than the species is frequently of importance.
Abstract: IN various fields of mycology it has long been realized that, for certain purposes, the orthodox descriptive method of systematic classification is by no means adequate. Fungal strains grouped together on the bais of similar physiological reactions have been found to cut right across species of diverse taxonomie affinities, and it appears that in such disciplines as, for example, clinical medicine, agriculture, and forest pathology, the strain rather than the species is frequently of importance.
8 citations
TL;DR: In this article, it was shown that the positron lifetime depends on the electron density at a positron, and to obtain a useful result it is necessary to improve the statistical treatment.
5 citations
TL;DR: The correlation between hâmoglobin and habitat can now be extended by the discovery of hæmoglobin in Elaphoidella gracilis, a species which inhabits burrows in decaying aquatic vegetation.
Abstract: HAEMOGLOBIN has only recently been found in free-1iving copepods. Munro Fox1 found that certain mud-dwelling harpacticoids contained this respiratory pigment, while allied species living in moss or open water lacked it. The correlation between haemoglobin and habitat can now be extended by the discovery of haemoglobin in Elaphoidella gracilis, a species which inhabits burrows in decaying aquatic vegetation. The red pigment in this species is easily visible under the microscope, and its identity was established spectroscopically.
4 citations
TL;DR: It is found that acetylcholine (Roche) and physostigmine (eserine; B.D.H.) affect the spawning activity of Hydractinia echinata.
Abstract: IT is usually considered that the responses of coelenterates are not mediated by acetylcholine1, because: (1) there is no evidence of significant amounts of acetylcholine or choline esterase in their bodies; (2) neither these substances, nor atropine, nor curare, affects their neuromuscular activities2. However, I have recently found that acetylcholine (Roche) and physostigmine (eserine; B.D.H.) affect the spawning activity of Hydractinia echinata.
3 citations
TL;DR: The presence of Schoenus nigricans on Irish blanket peats has often been reported and commented on in the literature and is likely to have an important role in the establishment of carboniferous strata.
Abstract: THE seemingly anomalous presence of Schoenus nigricans on Irish blanket peats has often been reported and commented on in the literature1,2,3.