منابع مشابه
A Convenient Small Osmometer
A description is given of a simple, rugged instrument for determining the osmotic pressure developed by a solution of a high polymer. Other small osmometers described previously [1, 2, 3, 4, 5]/ have been, in some respects, too inconvenient to use. Although relatively easy to make, glass osmometers are fragile and may require frequent repairs. Small metal osmometers, in addition to being rugged...
متن کاملAn automated osmometer.
A freezing-point apparatus, which measures osmotic pressure by determining freezingpoint depression, was modified by incorporating a slowly rotating circular tray with space for 30 sample vials, and a sample pick-up device. The instrument is designed to automatically pick up a cuvet containing a 2-mi. specimen of serum, urine, spinal fluid, or any biologic fluid, and to cool, supercool, freeze,...
متن کاملThe Erythrocyte Ghost Is a Perfect Osmometer
The osmotic swelling of intact erythrocytes in hypotonic solutions was measured using microhematocrit tubes, Van Allen tubes, and a calibrated Coulter counter. In agreement with earlier workers the intact cells did not behave as perfect osmometers, the cells swelling less than predicted by the Boyle-van't Hoff law. Erythrocyte ghosts were prepared from fresh intact erythrocytes by one-step hemo...
متن کاملA sensitive and accurate gel osmometer.
1. A bilayer strip, cut from a thin layer of cross-linked polyacrylamide gel cast on to cellulose tissue, forms an open circular loop whose ends are close together. Shrinkage of the gel, in response to the osmotic pressure of a non-penetrating solution, causes a proportional separation of the ends of the loop. This is measured with a microscope and micrometer eyepiece. 2. The resulting effectiv...
متن کاملA CONVENIENT SYNTHESIS OF MACROCYCLIC DIAMIDES
Some new macrocyclic dibenzotrioxadiamides, dibenzotetraoxadiamide, dibenzopentaoxadiamide, dibenzothiatrioxadiamide, tribenzotrioxadiamides and tetrabenzohexaoxadiamide (14-21), (26) and (27) have been prepared. These compounds were obtained in the macrocyclization step by reacting the diamine (4) with appropriak dicaxboxylic acid dichlorides (5-13) and (24). The cyclization does not requ...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1952
ISSN: 0091-0635
DOI: 10.6028/jres.049.042