Typical fingering patterns

Figure 5. Typical fingering patterns for PPG as well as the 2.5 and 7.5 wt % silica suspensions dispersed in PPG at the injection pressure of 6.0 kPa from...

Controlled acetolysis which cleaves the (l->6) linkages preferentially, gives finger prints for the yeast mannan, the structure of which consists of a (l->6) linked backbone with (l->2) or (l->3) linked short side chains (] ). We have tried to use this method for the Pyricularia oryzae heteroglycan. The PHG and the Arthrobacter exo-a-D-mannanase resistant PHG core were acetolyzed for 12 h at 0°. The deacetylated acetolysis products were separated on a column of Bio-Gel P-2 (Fig. ). Typical acetolysis patterns were obtained from the original PHG. It could be seen from the elution profile that the original PHG has either a (l->6) linked backbone with (l->2) or (1- 3) linked side chains, or (l->2) or (l- 3) linked oligosaccharide blocks interspersed in a molecule and these were link-... 

In a typical experiment, stable, vertical, liquid films were formed from the model PU formulation (see Section 5.3.1.1). These films were stable for two to five minutes. The series of photographs in Figure 5.3 depicts many of the physical features of these films. Thirty to sixty seconds after film formation, dark horizontal interference fringes were observed that initially appeared at the top of the film and steadily moved downward. Over time, the number of fringes decreased. Flow patterns, including eddy currents, fingering patterns and swirls, appeared at the bottom and sides of the films and rose upwards. The rate and amount of these flows decreased as the lifetime of the film increased. 

Under the polarized optical microscope, the liquid crystal films show colorful patterns, i.e., the optical textures. Each liquid crystal phase shows its typical texture which provides the means to identify the phase of the liquid crystals. The typical textures are the Schlieren, threadlike, homeotropic, homogeneous, marble, finger-print, focal-conic, Dupin cyclide, fan-shape, sanded, mosaic, and so on. They are the integrations of many typical defects mentioned above. Demus Richter (1978) were the first to review... 

Fig. 1. Typical acute eczematous streak of poison-ivy dermatitis caused by hand transfer of the antigen. Note the separation caused by the pattern of the fingers that transferred the antigen...

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