Zobrazeno 1 - 10
of 110
pro vyhledávání: '"J B Reed"'
Publikováno v:
Mineralogical Magazine. 77:227-248
Characterization of Brazilian agates containing a lower horizontally banded section and an upper chamber with bands parallel to the walls shows that these agates formed much later than the 135 Ma Paraná basalt host rock. Age differentiation between
Autor:
Stephen J. B. Reed
Publikováno v:
Microchimica Acta. 161:433-437
Synthetic multilayers consisting of alternating layers of materials with different X-ray scattering power take the place of ‘real’ crystals in wavelength-dispersive spectrometers for wavelengths greater than about 20 A and are used for analysing
Publikováno v:
Mineralogical Magazine. 71:461-476
Agates from a 430 Ma host at Stockdale Beck, Cumbria, England have been characterized. The crystallite size of the Stockdale Beck agates was found to be ~60% greater than any other agates from five regions aged 400–1100 Ma. Raman spectroscopy ident
Autor:
T. Moxon, S. J. B. Reed
Publikováno v:
Mineralogical Magazine. 70:485-498
Chalcedony and agates from a variety of world-wide hosts have been examined using cathodoluminescence (CL). Gaussian fitting of the experimental data shows that there are two dominant spectral emissions at ∼400 and ∼660 nm. A third subordinate pe
Autor:
S. J. B. Reed
Publikováno v:
Electron Microprobe Analysis and Scanning Electron Microscopy in Geology. :162-178
Autor:
Stephen J. B. Reed
Publikováno v:
Journal of Research of the National Institute of Standards and Technology
In setting up the conditions for quantitative wavelength-dispersive electron microprobe analysis a number of parameters have to be defined for each element, namely accelerating voltage, beam current, and (for each element) x-ray line, spectrometer cr
Publikováno v:
Retina. 21:339-343
Purpose To report the stability of acquired immunodeficiency syndrome (AIDS)-associated cytomegalovirus (CMV) retinitis lesions that have undergone regression in the absence of specific anti-CMV medications owing to highly active antiretroviral thera
Autor:
Stephen J. B. Reed
Publikováno v:
Microchimica Acta. 132:145-151
“Trace” elements may be defined as elements whose concentrations are of a similar order to the detection limit. In WD analysis the detection limit is a function of the ‘figure of merit’ P2/B, where P is the pure-element peak intensity and B t
Autor:
A. Buckley, S. J. B. Reed
Publikováno v:
ResearcherID
Electron-probe microanalysis (EPMA) is applicable to rare-earth elements (REE) in minerals with relatively high REE concentrations (e.g. hundreds of parts per million). However, given that each of the 14 REE has at least 12 X-ray lines in the L spect
Autor:
Myles D. Thomas, Dina Tiniakos, Glenda M. Horne, Thomas W. J. Lennard, John Anderson, Pernille Autzen, C. H. W. Horne, J. A. Henry, Gary G. McINTOSH, Brian Angus, J B Reed
Publikováno v:
The Journal of Pathology. 180:65-70
Cyclic phosphorylation/dephosphorylation of the retinoblastoma gene product (pRB) has been found to play a central role in the progression of the normal cell cycle, through modulation of the activity of the E2F family of transcription factors. Mutati