13C tracer recovery in human stools after digestion of a fat-rich meal labelled with [1,1,1-13C3]tripalmitin and [1,1,1-13C3]triolein

2011 ◽  
Vol 25 (19) ◽  
pp. 2697-2703 ◽  
Author(s):  
Laure Gabert ◽  
Cécile Vors ◽  
Corinne Louche-Pélissier ◽  
Valérie Sauvinet ◽  
Stéphanie Lambert-Porcheron ◽  
...  
Keyword(s):  
Tracer Recovery ◽  
13C Tracer

scholarly journals Differential allocation of carbon in mosses and grasses governs ecosystem sequestration: a 13C tracer study in the high Arctic

2009 ◽  
Vol 184 (4) ◽  
pp. 944-949 ◽  
Author(s):  
S. J. Woodin ◽  
R. van der Wal ◽  
M. Sommerkorn ◽  
J. L. Gornall
Keyword(s):  
High Arctic ◽  
Tracer Study ◽  
Differential Allocation ◽  
13C Tracer

scholarly journals SHINGLE TRACING BY A NEW TECHNIQUE

1978 ◽  
Vol 1 (16) ◽  
pp. 102
Author(s):  
Peter Wright ◽  
J.S. Cross ◽  
N.B. Webber
Keyword(s):  
Field Experiments ◽  
Radioactive Isotopes ◽  
Major Drawback ◽  
Medium Scale ◽  
Tracer Recovery ◽  
Tracer Techniques ◽  
Trial Field ◽  
Metal Detectors ◽  
A New Technique ◽  
Further Development

A major drawback of all existing tracer techniques for monitoring shingle movement, except that of labelling with radioactive isotopes, is that tracer recovery rates are invariably low, (commonly less than 15% of the total injected) because recovery is limited to the beach surface. Investigations were made into the possibilities of developing a new tracer that might overcome this problem. The paper describes the results of, and the conclusions drawn from two trial field experiments carried out using metal tracer pebbles. These had specific gravities, size and shape similar to the indigenous beach pebbles, and were recovered both on and beneath the beach surface using metal detectors. By assessing the relative merits and drawbacks of the technique it was concluded that the use of metal pebbles as tracers for shingle beaches is more practical than other methods for most tracing purposes. At present the technique is best suited to investigations ranging in length from a few days to a few months and requiring small to medium-scale injections of 5000 tracer pebbles or less. The considerable scope for the further development and application of the technique is discussed.

Integrated Analysis of Tracer and Pressure-Interference Tests To Identify Well Interference

SPE Journal ◽  
2020 ◽  
Vol 25 (04) ◽  
pp. 1623-1635 ◽  
Author(s):  
Ashish Kumar ◽  
Puneet Seth ◽  
Kaustubh Shrivastava ◽  
Ripudaman Manchanda ◽  
Mukul M. Sharma
Keyword(s):  
Response Times ◽  
Horizontal Wells ◽  
Integrated Approach ◽  
Pressure Response ◽  
Integrated Analysis ◽  
Well Drilling ◽  
Tracer Recovery ◽  
Well Spacing ◽  
Fractured Horizontal Wells ◽  
Interference Tests

Summary In ultralow-permeability reservoirs, communication between wells through connected fractures can be observed through tracer and pressure-interference tests. Understanding the connectivity between fractured horizontal wells in a multiwell pad is important for infill well drilling and parent-child well interactions. Interwell tracer and pressure-interference tests involve two or more fractured horizontal wells and provide information about hydraulic-fracture connectivity between the wells. In this work, we present an integrated approach based on the analysis of tracer and pressure interference data to obtain the degree of interference between fractured horizontal wells in a multiwell pad. We analyze well interference using tracer (chemical tracer and radioactive proppant tracer) and pressure data in an 11-well pad in the Permian Basin. Changes in pressure and tracer concentration in the monitor wells were used to identify and evaluate interference between the source and monitor wells. Extremely low tracer recovery and weak pressure response signify the absence of connected fractures and suggest that interference through matrix alone is insignificant. Combined tracer and pressure-interference data suggest connected fracture pathways between the communicating wells. The degree of interference can be estimated in terms of pressure response times and tracer recovery. An effective reservoir model was used to simulate pressure interference between wells during production. Simulation results indicate that well interference observed during production is primarily because of hydraulically connected fractures. Combined tracer and pressure-interference analysis provides a unique tool for understanding the time-dependent connectivity between communicating wells, which can be useful for optimizing infill well drilling, well spacing, and fracture sizing in future treatment designs.

Brain-blood permeability: TNF-α promotes escape of protein tracer from CSF to blood

2000 ◽  
Vol 279 (1) ◽  
pp. R148-R151 ◽  
Author(s):  
Jodi B. Dickstein ◽  
Harvey Moldofsky ◽  
John B. Hay
Keyword(s):  
Central Nervous System ◽  
Cerebrospinal Fluid ◽  
Nervous System ◽  
Tumor Necrosis ◽  
Venous Blood ◽  
Protein Clearance ◽  
Tracer Recovery ◽  
Tnf Α ◽  
The Central Nervous System ◽  
Necrosis Factor

The objective of this study was to determine the effect of tumor necrosis factor (TNF)-α on the efflux of protein from the central nervous system to blood based on assessing the clearance of radiolabeled albumin from the cerebrospinal fluid (CSF) to blood in rats. 125I-labeled human serum albumin (125I-HSA) was injected into a lateral ventricle, and venous blood was sampled hourly to determine the basal CSF protein clearance into the blood. After this, rats were intraventricularly infused with 10 μl TNF-α and 10 μl131I-HSA ( n = 6) or 10 μl saline and 10 μl 131I-HSA ( n = 6). Venous blood was sampled hourly for 3 h. 131I-HSA tracer recovery increased threefold in the venous blood and was significantly higher in the spleen, muscles, and skin in animals treated with TNF-α. No significant changes were observed in control animals treated with saline. The data suggest that TNF-α promotes the clearance of protein macromolecules from the CSF to the venous blood.

Local deposition of 13C tracer in the JET MKII-HD divertor

2013 ◽  
Vol 438 ◽  
pp. S762-S765 ◽  
Author(s):  
Jari Likonen ◽  
M.I. Airila ◽  
J.P. Coad ◽  
A. Hakola ◽  
S. Koivuranta ◽  
...  
Keyword(s):  
Local Deposition ◽  
13C Tracer

scholarly journals Human metabolism and elimination of the anthocyanin, cyanidin-3-glucoside: a 13C-tracer study

2013 ◽  
Vol 97 (5) ◽  
pp. 995-1003 ◽  
Author(s):  
Charles Czank ◽  
Aedín Cassidy ◽  
Qingzhi Zhang ◽  
Douglas J Morrison ◽  
Tom Preston ◽  
...  
Keyword(s):  
Tracer Study ◽  
Human Metabolism ◽  
13C Tracer
Sign in / Sign up

Export Citation Format

Share Document