Kinds of Glues

The usual practical situation is that in which two solids are bonded by means of some kind of glue or cement. A relatively complex joint is illustrated in Fig. XII-14. The strength of a joint may be measured in various ways. A common standard method is the peel test in which the normal force to separate the joint... 

In essence, the shared electrons act as a kind of "glue" to bind the two nuclei together into an H2 molecule. Both nuclei are simultaneously attracted to the same electrons and are therefore held together, much as two tug-of-war teams pulling on the same rope are held together. 

Amylase facilitates the removal of starch-containing stains such as those from pasta, potato, gravy, chocolate, and baby food. Dried-up starch is difficult to remove from medium- to low temperatures. Amylase adheres to the surface of laundry, acting as an adhesive for other stain components. Starch acts as a kind of glue which binds particulate soil to the surface. Amylase hydrolyzes the starch into dextrins and oligosaccharides the latter are readily dissolved in the washing liquor and thus successively diminish the stain. Likewise, dried-on food, in particular stains and films from starch-containing foods, may be difficult to remove in a dishwasher. 

In a medium of high ionic strength, in vitro hexamers can build up into short rods. However, such aggregation appears to require the presence of a so-called linker polypeptide (symbol L ), which apparently serves as a kind of glue. Since it has been shown that phycobiliproteins purified to strict homogeneity cannot form these phycobilisome subassemblies. The presence ofthese linker polypeptides in... 

Three kinds of glues or adhesives can be distinguished melt glues, solution glues, and polymerization glues. Elastomers, elastoplasts, or thermosets may be used in all three kinds. 

The section on dissolution makes use of the second part of the Digressions, which criticises Spielmann and puts forward a theory that dissolution is due to a kind of adherence between solvent and solute particles, as by a kind of glue , the particles being en rapport exact de pesanteur , depending on division into imperceptible parts and equiponderance. In crystaUisation similar particles attract one another and the solvent between them is squeezed out. Metals can also crystallise. The particles of a ciystal must have the same shape as the latter. 

Very pure sheets of graphene can be prepared and stacked together with water molecules that act as a kind of glue between them. 

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