The determination of the methionine requirement of laying pullets by a diet dilution technique

1970 ◽  
Vol 11 (1) ◽  
pp. 67-82 ◽  
Author(s):  
C. Fisher ◽  
T. R. Morris
Keyword(s):  
Dilution Technique ◽  
Diet Dilution

Respiratory physiology teaching: determination of residual volume by applying the indicator-dilution technique.

1998 ◽  
Vol 274 (6) ◽  
pp. S53
Author(s):  
H Heller ◽  
K Granitza ◽  
B Eixmann
Keyword(s):  
Indicator Dilution ◽  
Respiratory Physiology ◽  
Successful Outcome ◽  
Residual Volume ◽  
Dilution Technique ◽  
Laboratory Courses ◽  
Single Breath ◽  
Indicator Dilution Technique ◽  
Single Breath Method

Apart from the current teaching of spirometric methods in laboratory courses on respiratory physiology, we have included an experiment in which medical students determine their own residual volume by applying the indicator-dilution technique. For hygienic reasons we used a bag-in-the-box system to dilute helium within alveolar space by performing the single-breath method. Although each participant independently underwent only one single-breath maneuver, we gained a reliable relationship between residual volume and subjects' height and body weight in 68 female (r = 0.6, P < 0.0001) and 99 male (r = 0.42, P < 0.0001) students. From this successful outcome and with the opportunity to discuss the limitations of the single-breath method as well, we inferred that this experiment affords a transparent and instructive approach to interpreting the determination of lung volumes on the basis of the indicator-dilution technique.

An improved procedure for determination of cardiac output by a conductivity method

1960 ◽  
Vol 15 (6) ◽  
pp. 1062-1064 ◽  
Author(s):  
Edward J. Hershgold ◽  
Sheldon H. Steiner ◽  
Leo A. Sapirstein
Keyword(s):  
Cardiac Output ◽  
Cardiac Cycle ◽  
Base Line ◽  
Dilution Technique ◽  
Conductivity Method ◽  
Blood Conductivity ◽  
Arterial Blood ◽  
Dog Plasma ◽  
Synthetic Solution

The applicability of the hematocrit dilution technique employing arterial blood conductivity changes to the determination of the cardiac output has been extended by a) electronic damping of the detecting circuits, which permits greater amplification of the signal without increasing the variability of the base line that occurs during each cardiac cycle, and by b) development of a solution isoosmolar and isoconductive with plasma that substitutes for autogenous plasma in the procedure. The preparation of the synthetic solution is described. It is shown that this solution gives results indistinguishable from those obtained with plasma. Values are given for the conductivity and osmolarity of dog plasma. Submitted on December 3, 1959

Radioisotope Dilution Technique for Determination of Vitamin B12 in Foods

1982 ◽  
Vol 65 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Patrick J Casey ◽  
Keevin R Speckman ◽  
Frank J Ebert ◽  
William E Hobbs
Keyword(s):  
Standard Deviation ◽  
Vitamin B12 ◽  
Relative Standard Deviation ◽  
Extraction Procedure ◽  
Dilution Technique ◽  
Microbiological Method ◽  
Relative Standard ◽  
Wide Range ◽  
The Mean

Abstract A radioisotope dilution (RID) method for the determination of vitamin B12 is presented. The method combines a standard extraction procedure (AOAC 43.108,12th ed.) with a commercially available RID assay kit. The method was evaluated on a wide range of fortified and unfortified food products. Recovery studies on both groups yielded average recoveries of 98.1 and 95.8%, respectively. Reproducibility data generated from replicate analyses on both groups gave a relative standard deviation of 6.9% for the fortified group and 9.2% for the unfortified group. For the samples studied, the mean vitamin B12 content determined by the RID method was 8.01 μg/100 g vs imean of 7.54 μg/100 g by the AOAC microbiological method; the correlation coefficient was r = 0.983.

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