Materials Literature
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Three new pregnane glycosides, named periplocosides A, B and C, have been isolated from the antitumor fraction, which was obtained by subjecting the CHCl3 extract of Periploca sepium to column chromatography over silica gel and eluting with CHCl3-MeOh (10 : 1). Their structures were established by various nuclear magn…
The solubility of hydrogen in liquid pure aluminium has been redetermined for temperatures from 943 to 1123 K and pressures from 67 to 113 kPa (0·66 to 1·12 atm), using an appropriate version of Sieverts' method. The results fit the Van't Hoff isobar and Sieverts' isotherm. Recommended values for the solubility (S) ar…
It was found that pigeon lysozyme binds one calcium ion, as does equine lysozyme. The protein was eluted with equimolar calcium ions from a Bio-Gel P-60 column. The binding constants of equine and pigeon lysozymes were determined to be 2 x 10(6) and 1.6 x 10(7) M-1, respectively, in 0.1 M KCl at pH 7.1 and 20 degrees…
Research Article| April 01, 1988 Diatoms in Antarctic ice cores: Some implications for the glacial history of Antarctica L. H. Burckle; L. H. Burckle 1Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar R. I. Gayley; R. I. Gayley 2Department of…
Long-chain conjugated polymers are described which have electronic transitions with energies of approximately 2–4 eV. Excitation of these transitions by electromagnetic radiation results in strong absorption bands in the visible region of the spectrum and hence a coloured appearance to the polymer. It is shown that th…
The hydrodynamic aspects of lubrication by the smectic A liquid crystal octylcyanobiphenyl (8CB) were investigated in a thrust bearing and in the concentrated ball-on-flat contact. Both bearings were run with a Newtonian mineral basestock for comparison and performed as expected; friction followed the Stribeck curve i…
Abstract The title compound crystallizes in the triclinic space group P1̅ with lattice parameters a = 13.129 Å, b = 14.156 Å, c = 14.843 Å and α= 88.34°, β = 74.43°, γ = 70.86°. The polyanion evidently is the predominant species in pseudometatungstate phases the exact composition of which has not previously been deter…
The effects of conducting particles in gas-insulated switchgear (GIS) on insulation performance were investigated. The objective was to recognise the relationship between the length of conducting particles and AC impulse flashover voltages. The data showed that the minimum harmful length of conducting particles at var…
Abstract The properties of a new immobilized glucose isomerase, produced by a selected strain of Streptomyces murinus , are described. The major advantages of the new immobilized enzyme are a productivity of more than 10,000 kg syrup dry substance per kg enzyme under optimal industrial conditions, increased activity a…
(1988). ‘Magnesium products design’. British Corrosion Journal: Vol. 23, No. 3, pp. 154-156.
Results of tests for natural contamination of insulator strings in inland areas are discussed. Natural exposure tests with -280 kV DC voltage energization were carried out for 5 years. The following results were obtained: (1) The amount of contaminant on the bottom surface increased with the length of the exposure per…
The crystallization behavior of drugs from supersaturated solutions containing carboxymethylethylcellulose (CMEC) was investigated to clarify the mechanism of supersaturation phenomena from solid dispersions with enteric coating agents in JP XI 2nd fluid (pH 6.8). Nifedipine, griseofulvin and spironolactone were used…
A recent extension of the theory of ferromagnetic hysteresis to include the effects of a constant applied stress uses an effective field H/sub sigma / that depends on the stress and the rate of change of magnetostriction with magnetization. The extended theory is used here to derive a particularly simple expression fo…
The ab~lity of the ribbed mussel Geukensia demissa (Dillwyn) to ingest and absorb refractory lignocellulosic carbon was evaluated using 14C-radiotracer techniques. Mussels were maintained in a simulated tidal cycle of 6 h submergence and 6 h exposure and were fed on [14C]lignocellulose during the first submergence per…
The crystal structure of K14[P2W19O69(OH2)]·24H2O has been determined [space group Fddd, a= 28.800(3), b= 38.143(8), c= 32.005(7)Å, Z= 16, R= 0.048 for 3 108 reflections with I > 3σ(I)]. The anion has crystallographic symmetry 2, very close to a C2v point group symmetry. Two α-A-PW9O349– units are linked through one W…
The precipitation of calcium carbonate by strains of the moderately halophilic species Deleya halophila was studied. The influence of salinity and temperature on the formation and type of crystals formed by these strains was also investigated. All strains tested were capable of precipitating CaCo3. Low temperature and…
Description Twenty-two papers address: quality requirements for better bearing steels; new methods to evaluate quality of better bearing steels; and new processes to produce better bearing steels.
A servo actuator using shape-memory alloy (SMA actuator), which performs special functions not found in conventional actuators, is expected to be a new driving source for future robots. This paper evaluates its performance and discusses the fundamental issues in designing such actuators. Being driven by the thermal ma…
A ruthenium porphyrin catalyses the epoxidation of several cholest-5-ene derivatives by air in high yield and with nearly complete β-stereospecificity; C-3-unprotected cholesterol is unaffected, but cholesteryl acetate gives nearly pure (>99%) 5β,6β-epoxide.
A newly developed technique for SEM sample preparation has been applied in the study of the effects of process parameters on the microstructure of gum arabic spray-dried microcapsules. The technique, that employs embedding in an apolar resin and partial polymerization makes it possible to simultaneously observe the in…