Practical organic and bio-chemistry / by R.H.A. Plimmer.

  • Robert Plimmer
Date:
1915
Catalogue details

Licence: Public Domain Mark

Credit: Practical organic and bio-chemistry / by R.H.A. Plimmer. Source: Wellcome Collection.

    583/660 page 563
    2. URINARY SEDIMENTS. The sediment is separated by means of the centrifuge and examined under the microscope. A. IN ACID URINE. Amorphous Deposits. (1) Urates. This deposit is known as “brick dust” from its pink colour (uroerythrin). It may contain crystalline forms, and may dissolve completely on warming the urine. A little of the sediment is boiled with water. It is soluble; the hot solu- tion is acidified with hydrochloric acid and cooled. Uric acid crystallises out ; the crystals are examined with the microscope and tested with the murexide reaction. Urates may deposit from concentrated urine on cooling, as is commonly found in fevers. The chief constituent is acid sodium urate. (2) Calcium Oxalate. Calcium oxalate has the appearance of dumb-bell or spheroidal bodies (en- velope crystals) under the microscope. It is insoluble in strong acetic acid and ammonia, but soluble in hydrochloric acid. (3) Bilirubin or Hzematoidin. Yellow granular amorphous masses, which give Gmelin’s reaction, gener- ally consist of bilirubin. Crystalline Deposits. (4) Uric Acid. This is known as cayenne pepper deposit as it is ofsandy-red colour. Ithasa distinctive crystalline form under a microscope and gives the murexide reac- tion (Fig. 80). (5) Calcium Oxalate. This sediment consists of colourless, transparent, highly refractive octa- hedral crystals (envelope shaped). It is insoluble in acetic acid, but soluble in hydrochloric acid (Fig. 81). shee
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