gelatin

(jel’at-in) [L. gelati’na, gel a’re to congeal). An albuminoid from various animal ti ues; a colorle , transparent substance, hard when dry, but becoming jelly-like when moistened: glue and size are forms of it. It is much used in pharmacy and the arts. Gelatin has been used subcutaneously to arrest internal hemorrhage and to cause coagulation in sacculated aneurysms. g.-culture, a bacterial culture-preparation with gelatin for its basis. g.-disk, a disk of medicated gelatin used for the treatment of the eye. formalin-g. See giufol. glycerinated g., a preparation of equal parts of gelatin and glycerin. Japanese g., agar-agar. medicated g., gelatin mixed with medicated substances: for local application. nutrient g., a variety of culture medium consisting of nutrient bouillon and enough gelatin to solidify the medium. g.- peptone, a product of the digestion of gelatin. lorkowski’s g., a medium for cultivating typhoid bacilli, containing 5 gm. of peptone, 33 gm. of gelatin, to the liter of urine of 1020 specific gravity. silk-g. See sericin. g.-sugar, the same as glycocoll. vegetable g., a gelatin-like matter obtained from vegetable ti ues. g. of m, the jelly-like ti ue of the umbilical cord. gelatinase (jel-at/in-as). An enzyme which liquefies gelatin, but does not affect fibrin of egg- albumin. It occurs among bacteria, molds, yeasts, etc.