Cross striation

Huxley, H.E. Hanson, J. (1954). Changes in the cross-striations of muscle during contraction and stretch and their structural interpretation. Nature 173,973-976. 

Cells plated at 2-3.5 X 106 cells/6 cm plate attach and multiply for 2 days but at about 50 h the cells enter a period of cell fusion to form a network of multinucleate fibres and cross-striations become obvious ( 15.4). 

Figure 10.9 Unexpected cross-reactivity with contractile filaments (cross-striations, intercalated discs) in cardiac myocytes. No staining of sarcolemmal cells, interstitial cells or endothelium. See color insert.

Fig. 5-16 Schematic diagram showing how the staggered arrangement of tropocollagen molecules gives rise to cross-striations in a fibril negatively stained with phosphotungstic acid.

An extensive study of the reaction of hydrazine with collagen under different conditions has been carried out recently by de la Burde et al. (1963). They used steer corium collagen before and after a short liming and carried out hydrazinolysis at room temperature for 30 hr in up to 70 % aqueous hydrazine. The treated fibers examined under the electron microscope still showed the characteristic cross-striations and periodicity of native collagen provided the hydrazine concentration did not exceed 55 %. 

SLE systemic lupus erythrematosus. smooth muscle (involuntary muscle plain muscle) Unlike striated muscle, smooth muscle has no cross-striations under the microscope, indicating an organization characteristic of muscle controlled by the autonomic nervous system, and reacts more slowly to neurotransmitters than striated muscle (skeletal muscle) of the voluntary nervous system. 

The bands are formed by staggered collagen molecules. Cross striations are about 680 A apart. Each collagen molecule is about 3000 A long. 

L Spindle-shaped tumor cells with rare cross-striations... 

The apparently continuous cross striations seen in most cases indicate that the unresolved protofibrils are placed in the fibril in such a way as to align corresponding chemical features normal to the fibril axis, as was assumed for the small-angle diffraction model. This tendency toward transverse matching can be demonstrated in another way. Fibrils contain along their surfaces the same chemical array as do the protofibrils, so that even fibrils often occur in parallel bundles with a marked degree of correspondence between locations of band levels (90). This is shown in Fig. 24. 

In 1897 Tbrnebohm, a Swedish investigator, possibly realizing that because of compositional variation mineral names mightbe better suited for clinker phases than chemical formulas, clearly described the optical features of the principal clinker phases in thin sections and powder mounts and coined the terms alite, belite, celite, felite, and also glassy residue. Tbrnebohm stated that "belite "has two or three sets of cross striations and felite" has one set of parallel striations formed at low temperature. Tbrnebohm related microscopical data to burning conditions, stating ... 

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