Suitability of a simple sampler using a brass bar for gaseous tritiated water measurement

ABSTRACT The distribution of oxytocin in the kidneys, liver, uterus and skeletal muscle of the rat was followed during 10 min after intravenous injection of tritium labelled oxytocin. Oxytocin was found to be taken up and degraded mainly in the kidneys and the liver. After 150 seconds no intact oxytocin could be detected in these organs. The time course of the distribution of the radioactivity in the liver and the skeletal muscle showed no noteworthy characteristics, whereas a different course was found in the kidneys and in the uterus. In the kidneys, the radioactivity increased continuously from 60 to 200 seconds after the injection, indicating an accumulation of oxytocin or its metabolites in the kidneys. In the uterus a high initial uptake was observed, followed by a decrease of the radioactivity from 60 to 100 seconds after the injection. This distribution pattern was specific to oxytocin, since the uptake of tritiated tyrosine and tritiated water was almost constant during the same time period. These findings may indicate a preferential distribution of oxytocin to the uterus.

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Exit plane water measurement in SCRAMJET flows

10.2514/6.1994-387 ◽

1994 ◽

Keyword(s):

Exit Plane ◽

Water Measurement

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Variation in the wheat intake of individual sheep measured by use of labelled grain: behavioural influences

Australian Journal of Experimental Agriculture ◽

10.1071/ea9810395 ◽

1981 ◽

Vol 21 (111) ◽

pp. 395 ◽

Cited By ~ 9

Author(s):

E Juwarini ◽

B Howard ◽

BD Siebert ◽

JJ Lynch ◽

RL Elwin

Keyword(s):

Dominance Hierarchy ◽

Tritiated Water ◽

Supplementary Feeding ◽

Previous Experience ◽

Feed Consumption ◽

Wheat Grain ◽

Accurate Calculation ◽

Early Introduction

A preliminary experiment with sheep in pens demonstrated that wheat grain could be labelled with tritiated water so that when fed it could provide data that would allow accurate calculation of individual feed consumption. This techinque was used with two groups of sheep fed supplementary wheat grain in paddocks. Half of the animals had previous experience of grain feeding some eight months earlier and the others had not eaten grain. Individual diversity of intake could be estimated usefully by tritium labelling of wheat, which was fed to the sheep in a group. The experiment showed that there was a threefold difference in the amount of wheat eaten between the lowest and highest intakes. Further, animals with previous experience of grain feeding consumed the entire ration initially, but those without previous experience did not consume all of the ration until two weeks after wheat feeding began. Over the period of measurement the experienced sheep consumed about 13% more wheat than the non-experienced group. There were insufficient aggressive acts to establish a dominance hierarchy in either group, although the experienced sheep were more aggressive than the others. Aggressiveness by one sheep towards other sheep did not result in higher wheat intakes by the former compared with other sheep in the group. The results are discussed in terms of the variability in acceptance of such supplements by animals, and of the value, later in life, of early introduction of supplementary feeding.

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Chloride and Tritiated Water Flow in Disturbed and Undisturbed Soil Cores

Soil Science Society of America Journal ◽

10.2136/sssaj1974.03615995003800050014x ◽

1974 ◽

Vol 38 (5) ◽

pp. 727-732 ◽

Cited By ~ 58

Author(s):

M. A. McMahon ◽

G. W. Thomas

Keyword(s):

Water Flow ◽

Tritiated Water ◽

Soil Cores ◽

Undisturbed Soil ◽

Undisturbed Soil Cores

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