Gelatinous substances

In the most brilliant period of his career, Graham had demonstrated that certain polymers, including many gums, were unable to diffuse through certain gelatinous substances, membranes, and paper. He called the materials incapable of permeating a membrane "colloids", and reported that they could be obtained in a state free from diffusable "crystalloid materials" by this technique (20). 

After a preliminary dry polishing for several minutes, an alcoholic solution of a gelatinizing substance—centralite (p. 645) (3% in relation to the weight of powder) or camphor (1.5-2%)—is introduced through an opening in the side wall of the drum. These substances are usually injected in the form of a 10-20% solution sprayed with compressed air. The solution should have a temperature of about 50°C when centralite... 

The Collodion Processes, Positive and Neua-tive.—Collodion, so named from its adhesive nature, is a gelatinous substance made by dissolving pyroxylin -gun-cotton—in a mixture of ether and alcohol. It is extensively used in photography, as a vehicle for supporting the sensitive chemicals. 

Silver Metavanadate, AgV03, is a yellow, gelatinous substance obtained by interaction between silver nitrate and a metavanadate in neutral solution. It is soluble in nitric acid and in ammonia.5... 

MesogLEa A gelatinous substance between the entoderm and the ectoderm of some of the simpler animals. 

About 6o c.c. are then collected separately in a flask this should be colourless, or almost so, and a few drops of it, treated with a solution of gelatine and sodium chloride (or with some of the initial distillate, which contains a small quantity of gelatinous substances and is a good reagent for the detection of tannin), gives no turbidity. 

Gin patented cyanimidea or their derivatives rich in nitrogen, mixed with substances yielding oxygen, such as ammonium nitrate and ammonium chromate. Nobel s Explosives Co., Ltd., patented an explosive for ballistic purposes from nitrocellulose and nitroglycerine with the aid of nonvolatile gelatinizing substances. 

The aluminum in the zinc phosphate cements was considered very important, van Dalen [21] recognized its importance first. The reaction of zinc oxide and phosphoric acid was greatly moderated by aluminum. This effect was attributed to formation of an aluminum phosphate gelatinous coating on zinc oxide particles. In fact, Wilson and Nicholson believe that the gelatinous substance may even be zinc aluminophosphate phase [3], which subsequently crystallizes into hopeite and aluminophosphate amorphous gel (AlP04-nH20). 

Ethyl stannonic acid. —Prepared in a similar manner to the methyl compound, it forms a white, amorphous, gelatinous substance which becomes yellowish-brown and transparent on drying. It is insoluble in water and the common organic solvents, but dissolves in dilute mineral acids. When freshly prepared it is soluble in alkali hydroxides, but becomes insoluble after keeping. When strongly heated in the absence of air it yields ethane and ethyl alcohol. The following salts have been prepared sodium, potassium, magnesium, barium, and... 

Sheepfoot Jelly The gelatinous substance obtained by boiling the bird s foot trefoil, Lotus corniculatus. 

Neuridin—C HkNi—a diamin of undetermined constitution, is produced, along with cholin (3. .), during the earlier stages of putrefaction, particularly of gelatinoid substances, and increases in quantity as putrefaction advances, while the quantity of cholin diminishes. The free base is a gelatinous substance, having a very marked seminal odor, readily soluble in water, insoluble in alcohol and in ether. Its chlorid is crystaliine and very soluble in water. It seems to be non-poisonous when pure. 

Gelatinous Substances.—/8oiM6 e in hot HtO without modification.—Gelatin. 

Vanadium(II) hydroxide is a grayish violet gelatinous substance. It absorbs oxygen from the air, even when dry, to form a greenish hydroxide of vanadium(III). 

---