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Article
Properties of the Melt Processed 2212 Bscco in Silver
This study has attempted to optimise the processing condition of the 2212 BSCCO enclosed in silver. It has demonstrated that a systematic approach is necessary in order to achieve. the desired properties. It h...
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Article
R-phycoerythrin from the macroalgaCorallina officinalis (Rhodophyceae) and application of a derived phycofluor probe for detecting sugar-binding sites on cell membranes
R-Phycoerythrin (absorption spectrum 280; 495;sh 535, 564 nm with A564/A280 ratio of 5.3) was purified from the red macroalgaCorallina officinalis. The relative molecular mass determined from PAGE was 240 000. SD...
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Article
R-phycoerythrin from the macroalgaCorallina officinalis (Rhodophyceae) and application of a derived phycofluor probe for detecting sugar-binding sites on cell membranes
R-Phycoerythrin (absorption spectrum 280; 495;sh 535, 564 nm with A564/A280 ratio of 5.3) was purified from the red macroalgaCorallina officinalis. The relative molecular mass determined from PAGE was 240 000. SD...
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Chapter
Interleukin-2 Induced Changes in Mononuclear Cell Surface Charge
Interleukin-2 (IL-2) is not only the hormone responsible for progression of the T cell cycle, but it is also a potent activator of cytolytic (lymphokine-activated killer, LAK) activity against a wide variety o...
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Article
Abstracts of scientific presentations
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Article
The effect of tumour progression on lymphocyte responses to lectins, measured by fluorescence polarization techniques
The process of fluorochromasia involves the hydrolysis by cells of fluorescein diacetate resulting in an intracellular accumulation of fluorescein. The polarization of the fluorescence of the fluorescein appea...
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Chapter
Crystal Structures of EumgF4, SmMgF4 and SrMgF4
Crystal structures of EuMgF4 and SrMgF4 were determined using a computer-controlled x-ray powder diffractometer. Single crystal growth has been unsuccessful to date because the materials melt incongruently. It wa...
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Book
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Chapter
Estimation of Error Introduced by Ignoring the Background
Whenever X-ray intensity measurements are made on a selected peak, occuring at a certain setting of the goniometer, some fraction of the measured counting rate is always due to background. The significance of ...
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Chapter
Variation of limit of detection with analysis time
A series of measurements of fluorine in cement sample yielded a peak counting rate of 4 c/s/% for fluorine (F Kα) over a background of 6.5 c/s.
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Chapter
Continuous radiation — Scattered radiation
A The continuous radiation from an X-ray tube is scattered by the sample, diffracted by the analyzing crystal and measured by the detector.
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Chapter
Particle statistics in X-ray diffractometry
Only those crystallites having the reflecting planes almost parallel to the specimen surface can contribute to a certain reflection. The intensity of the resulting diffraction is thus dependent on this number ...
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Chapter
Dispersion as a function of ‘d’ spacing
LiF is commonly used as an analysing crystal. The (200) reflection planes are commonly used, having a “2d” value of 4.028 Å. It is, however, possible to use reflecting planes with other Miller indices (hkl) for e...
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Chapter
Determination of CaO in cement (ratio measurement)
The following data were obtained using a series of cement samples. Counting ratios were determined on the Ca Kα line using sample 5 as the ratio standard.
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Chapter
Absorption correction involving primary and secondary absorption
The slope of a calibration curve for a certain element is dependent upon the total absorption of the measured wavelength within the sample matrix. Although it is common practice to assume that only secondary a...
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Chapter
Pulse height selection — crystal fluorescence
It is necessary to set up an X-ray spectrometer for the measurement of sodium in a series of rock specimens. An argon/methane flow counter is being employed and a KAP (potassium hydrogen phthalate) analysing ...
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Chapter
Calculation of matrix absorption and prediction of absorption effects
The total secondary absorption of a matrix is given by
16 <math display='block'> <mrow> <msub> <mi>μ</mi> <mrow> <mi>m</mi><mi>a</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>x</mi... -
Chapter
Calculation of quantity of heavy absorber needed to minimize matrix effects
In the analysis of tin ores it is found that a very curved calibration line is obtained due to the large difference in the mass absorption coefficients of the two matrix components Sn (µ = 13) and SiO2 (µ = 1.80)...
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Chapter
Use of α correction factors (concentration correction)
A series of samples are being analysed for lead using the Pb Lα line. It is found that zinc which is also present strongly absorbs the Pb Lα wavelength resulting in a very poor calibration curve. The following da...
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Chapter
Quantitative diffractometry — determination of Anatase in Rutile
A sample is known to contain two crystalline modifications of TiO2, namely rutile and anatase. Spectrographic analysis failed to reveal the presence of other elements, so the sample can be assumed to consist only...
