Saliva Testing as a Practical Tool for Rapid HIV Screening

HIV and AIDS - Updates on Biology, Immunology, Epidemiology and Treatment Strategies ◽

10.5772/20751 ◽

2011 ◽

Author(s):

H. Blake ◽

P. Leighton ◽

S. Sharm

Keyword(s):

Hiv Screening ◽

Practical Tool

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Using crystallographic symmetry in diffraction and contrast analysis

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100154494 ◽

1989 ◽

Vol 47 ◽

pp. 504-505

Author(s):

U. Dahmen ◽

K.H. Westmacott

Keyword(s):

Electron Microscopy ◽

High Symmetry ◽

Two Phase ◽

Tem Analysis ◽

Crystallographic Symmetry ◽

The Matrix ◽

Contrast Analysis ◽

Practical Tool ◽

Convergent Beam ◽

Beam Diffraction

Despite the increased use of convergent beam diffraction, symmetry concepts in their more general form are not commonly applied as a practical tool in electron microscopy. Crystal symmetry provides an abundance of information that can be used to facilitate and improve the TEM analysis of crystalline solids. This paper draws attention to some aspects of symmetry that can be put to practical use in the analysis of structures and morphologies of two-phase materials.It has been shown that the symmetry of the matrix that relates different variants of a precipitate can be used to determine the axis of needle- or lath-shaped precipitates or the habit plane of plate-shaped precipitates. By tilting to a special high symmetry orientation of the matrix and by measuring angles between symmetry-related variants of the precipitate it is possible to find their habit from a single micrograph.

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