Automatic Dilution Research Articles

A New Automatic Dilution Viscometer and its Use for the Determination of Intrinsic Viscosities of Polymer Solutions.

A New Automatic Dilution Viscometer and its Use for the Determination of Intrinsic Viscosities of Polymer Solutions.

A Kinetic Photometric Method for Serum γ-Glutamyl Transpeptidase

Abstract A kinetic method is described for the determination of γ-glutamyl transpeptidase activity in serum. Optimal conditions for the reaction were ascertained, normal values in milliunits per milliliter at 25° established, and the reliability of the method examined. γ-Glutamyl-p-nitroanilide in ammediol-HCl buffer at pH 8.2 is employed as substrate. The method requires only 0.1 ml. of serum and, using an automatic cuvet positioner and recorder as well as an automatic diluter, more than 60 determinations can be carried out in 1 hr. On the basis of a large number of determinations, the method was shown to be technically excellent and clinically valuable.

Spectrophotometric Determination of Ethanol in Wine

A variation of the micro-dichromate method for the determination of ethanol in wine was devised. Reproducible pipetting of a 1-ml sample was achieved through the use of an automatic diluter. Distillation of the sample into an acidic potassium dichromate solution in a 50-ml volumetric flask permitted simple dilution to volume after heating 20 minutes at 60° C. Percent alcohol by volume was then determined from a direct digital concentration spectrophotometer af 600 mµ after standardization with a known ethanol-water mixture, similarly distilled and reacted. The method eliminates the need for a standard ferrous ammonium sulfate solution as a titrant and the normal indicator solution as well as the difficulties encountered with a 1-ml volumetric pipette.

Apparatus for automatic dye dilution measurement of cardiac output

Apparatus for automatic dye dilution measurement of cardiac output

CULTURE CONDITIONS AND THE DEVELOPMENT OF THE PHOTOSYNTHETIC MECHANISM

1. An apparatus has been developed which maintains a constant density of population of Chlorella by automatic dilution of the growing culture with fresh medium. 2. Cells harvested from the apparatus in daily samples are highly uniform in rate of growth and rate of photosynthesis measured under arbitrarily chosen conditions.