Fibrous MAPs

Both dynein and MAP2 interact with microtubules at the same binding sites, namely, the C termini of a- and p-tubulin. Also, MAP2 inhibits the microtubule-activated ATPase of dynein and prevents microtubule gliding on dynein-coated glass coverslips. Thus, MAP2 and other fibrous MAPs may be regulators of microtubule-based motility in vivo (Paschal et al., 1989). 

EDS analysis of yam cross sections could provide additional information, and document, for example, whether sulfur from the air permeates the fibrous core as well. Such is the case in the fume fading of textiles enclosed in environments with sulfur and nitrogen oxides. Elemental mapping of the fiber cross sections would show the depth of penetration of the absorbed or adsorbed species, and perhaps indicate the length of exposure, as well as of exposure to gaseous rather than aqueous environments. 

Lang (1956a,b) attempted a complete map of the diffracted intensity, but was handicapped by the low resolution inherent in the use of counter techniques with fibrous materials. Although quantitative data are highly desirable, they are very difficult to obtain from fibrous materials of large period. Measurements of meridional intensities in various keratins reported by Onions et al. (1960) are of considerable interest in comparative studies, but cannot be used to check structures because the slit collimation used does not differentiate between meridional and near-meridional reflections. The same difficulty applies to the intensities quoted by Bear (1944). 

Fig. 2. Low and high resolution maps of polysaccharides distribution in the Goniastrera skeleton (a) Polished surface of wall and septa (b) Low resolution X-ray fluorescence map higher concentrations of S-polysaccharides are visible in EMZ of wall and septa (c) High resolution X-ray fluorescence map in fibrous tissue. Evidence of the layered distribution of S-polysaccharides (d) Banding pattern within the mineral phase. Correspondence between mineral stepping growth and layered distribution of polysaccharides indicates that the two phases (organic and mineral) interplay at a submicrometre scale.

Kirfel and Gibbs concentrated on the electron density distributions and bonded interactions for the fibrous zeolites natrolite, mesolite and scolecite and related materials via accurate single-crystal X-ray diffraction. BCP properties of calculated densities supplement their study and relief maps of V p are inspected. A study of the lumps and holes in the VSCC of microporous zeolites such as natrolite were promised. The authors anticipated to be able to delineate the sites of reactivity. 

P.W.R.Beaumont, J.K. Wells and P.D.Angtice, Development of fracture maps for fibrous composites, Proc.37 Annual Techn. Conf. Reinforced Plastics, Composites Institute, Jan. 11-15, 1982, 20 A, 1. 

Figure 20 Energy-dispersive X-ray map showing distribution of grafted polyfvinyl phosphonate oligomerH/V-hydroxy-methylacrylamide) in fibrous cotton cellulose. Fibers were inunersed in water solution of oligomer and monomer then high-energy irradiation (a) fibrous cross-section as is (b) cross-section showing location of phosphorus in copolymer...

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