Gelatin layers

This material has been known for many years, being used originally in the making of electric lamp filaments. In principle vulcanised fibre is produced by the action of zinc chloride on absorbent paper. The zinc chloride causes the cellulosic fibres to swell and be covered with a gelatinous layer. Separate layers of paper may be plied together and the zinc chloride subsequently removed to leave a regenerated cellulose laminate. 

Stripping film adheres less firmly than a layer of liquid emulsion, thus film can be displaced from specimen during development Presence of the gelatin layer above the emulsion may yield staining problems, as gelatin can become stained, obscuring view of specimen... 

Other sets of hair cells are formed in specialized parts of the inner ear.964 The three semicircular canals detect angular acceleration in three directions, while the sac-like utricle and saccule detect linear acceleration including gravitational attraction. These two organs each contain a patch of hair cells whose tips project into a gelatinous layer, which is overlain by a field of small crystals of calcium carbonate. These little stones (otoliths) provide an inertial mass, which resists movement causing the hair cell tips to bend and activate mechanoreceptors to send information about balance and orientation to the brain. 

Finally, the particulate barrier did serve to absorb pools of blood ( 150x), adhered to the injured tissue and provide physical abrasion properties that may eventually be a compliment or pretreatment to a wound instead of an environmentally protective barrier dressing. A demonstration of rapid blood absorption by the barrier dressing is shown in Figs. 2.35-2.38. Theoretically, only seconds would be required to absorb fluid from bleeding wounds and form a protective gelatinous layer over the wound. 

There are several different types of P.O.P., salted paper, albumen, gelatino-chloride, and collodio-chloride, differing in the medium used to suspend the light-sensitive substance and if the sensitizer is applied in the salting solution (as in an emulsion) or as a second step. In the traditional salted paper process the silver is held by the fibers of the paper while albumen papers use egg whites as the binder. Gelatino-chloride papers suspend the silver in a gelatin layer and collodio-chloride uses a binder of cellulose nitrate. 

III. The inner envelope a syncytial layer showing much variation. Some workers divide this layer into two zones - zone I, a cytoplasmic layer and zone II, a gelatinous layer (Fig. 7.14). Part of this embryonic layer gives rise to the embryophore (Fig. 7.4) and also to the oncospheral membrane (Figs. 7.4, 7.11 and 7.14) (a very thin layer surrounding the oncosphere), which is often counted as a fourth layer. Additional layers, which may be further derived from the above basic envelopes have been reported in some species (e.g. H. nana 204), but it is beyond the scope of this text to discuss all the various modifications which can occur. Only those features which have a special physiological significance are discussed below. 

This envelope is a syncytial layer involving two cells Ailing the space between the embryo and the egg shell it is responsible for the formation of the embryophore and oncospheral membrane (204). After the latter is formed, what is left of the inner envelope becomes the cytoplasmic and gelatinous layers-zones I and II, respectively, in H. diminuta (Fig. 7.14). The latter has the ability to swell readily in dilute salt solutions, a property which may facilitate the escape of the oncosphere during hatching (p. 191) (442). 

Test Indicates presence of Variety" Shell Cytoplasmic layer Inner envelope Gelatinous layer Embryophore Penetration gland Hooks... 

A Study Requiring High Precision Determination of the Thickness of a Gelatin Layer Adsorbed on Silver Bromide... 

The ability to make very precise measurements has allowed us to use the disk centrifuge to determine the thickness of adsorbed gelatin layers on silver bromide particles (4). When particles are coated with an adsorbed polymer layer, the sedimentation time reflects the size and density of the particle core as well as the thickness and density of the adsorbed layer. An apparent (incor-... 

Figure 7. Apparent particle size distributions of a silver bromide dispersion (a) in 0.001 N NaNO with the gelatin layer...

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