Gravel Bed Rivers

Author: Michael Church
Publisher: John Wiley & Sons
ISBN: 0470688904
Size: 66.89 MB
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Open symbols indicate exposed tracers and closed symbols indicate buried
tracers. Competent flow duration was estimated using published information
about flow duration exceedence frequency in Allt Dubhaig and an individual
hydrograph analysis in Carnation Creek. Published values taken from Hassan (
1990), Haschenburger (2011), and Lenzi (2004), plus original observations for
Allt Dubhaig (R. Ferguson, pers. comm., 2010). Figure 5.4 Exchange probabilities
based on a ...

Isotope Tracers In Catchment Hydrology

Author: Carol Kendall
Publisher: Elsevier
ISBN: 9780444501554
Size: 15.40 MB
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The most commonly applied nuclides for erosion rate measurements are 3He, l°
Be, 26Al and 36Cl. Until recently, use of these nuclides was restricted to
determining denudation rates of exposed bedrock outcrops: recently, several
research groups have begun to measure nuclide abundances in sediments with
the goal of estimating basin-scale rates of denudation. 19.2.1 Cosmogenic
nuclides in exposed outcrops The abundance of a cosmogenic nuclide in a
sample of outcropping ...

Isotope Tracers In Metabolic Research

Author: Robert R. Wolfe
Publisher: John Wiley & Sons
ISBN: 9780471462095
Size: 65.79 MB
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from the discussions above, no amount of radiation exposure can be considered
“safe.” However, certain limits have been set on the basis of a variety of criteria.
For individuals occupationally exposed, the maximum annual doses to any organ
cannot exceed 5 rem to the red bone marrow, head, trunk, gonads, and lenses of
TABLE 2.2 Risks Related to Specific Radiation Dosages Dosage (rads) Exposure

Tracer Hydrology 97

Author: A. Kranjc
Publisher: CRC Press
ISBN: 9789054108757
Size: 46.40 MB
Format: PDF, ePub, Docs
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Young daphnia magna are exposed to different dye concentrations prepared with
artificial sweet water. After 24 hours and 48 hours the number of flea that are
unable to swim is evaluated. The pH value and the content of the oxygen is
controlled during the experiment. 3 RESULTS The presented toxicological results
for different tracers are subdivided into human toxicology and ecotoxicology. 3. 1
Human toxicology Fluorescein, as noted above, is widely used in medicine,
where it is ...

Handbook Of Occupational Dermatology

Author: Lasse Kanerva
Publisher: Springer Science & Business Media
ISBN: 9783540640462
Size: 66.26 MB
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dermal exposure patterns and identify the mechanism of skin exposure, and are
also valuable for worker education and training. However, in practice this
technique has a number of limitations: (i) use of tracers requires the introduction
of an additional substance to the production process, (2) the relative transfer of
the substance of interest and the tracers needs to be demonstrated during field
investigations, (3) additional quality-assurance steps may be required during
laboratory ...

The Use Of Fluorescent Tracers As An Index Of Dermal Exposure To Pesticides

Author: Lowell Ashbaugh
Size: 24.85 MB
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The following factors were felt to be requirements for a suitable tracer : 1. Toxicity-
the material must be non-toxic in terms of dermal, respirable, and gastro-
intestinal exposure. 2. The tracer must be of a similar nature to pesticide in terms
of dermal exposure mechanism; i.e. the transfer properties of the tracer from
foliage to worker must be similar to those of pesticide. 3. The tracer must not
change fluorescence intensity over time, or when exposed to environmental
variables such as ...

Occupational Hazards Of Pesticide Exposure

Author: Donald J. Ecobichon
Publisher: CRC Press
ISBN: 9781560327066
Size: 75.21 MB
Format: PDF
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Basically, images of exposed subjects were analyzed by measuring the mean
fluorescence intensity of tracer deposits on the skin using the standard curve to
convert the gray value or l.s.b's to a mass per pixel or per cm2, which then was
multiplied by the area of the deposit to obtain the mass of tracer per deposit. The
masses of all deposits were summed to determine the total mass of tracer on the
subjects' skin. Interpolation was used to calculate quantities lying between
calibration ...


Author: Laura Griffin
Publisher: Simon and Schuster
ISBN: 1451689365
Size: 44.84 MB
Format: PDF, Kindle
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Laura Griffin. o | - | | || - | - "I love the Tracers series!" —New York Times
bestselling author Allison Brennan New York Times sesseline author WHAT YOU
NOVEL - “Gritty, imaginative, sexy! You MUST read Laura Griffin.” —Cindy
Gerard,. Front Cover.

Isotopic Tracers In Biology

Author: Martin D. Kamen
Publisher: Elsevier
ISBN: 1483274330
Size: 72.77 MB
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... Ruben, in collaboration with Hassid and Kamen," began experiments using the
short-lived carbon isotope C" (half-life, 20.5 min.). The plan of research was
simple. Green plants or algae, actively photosynthesizing CO2, were exposed to
tracer quantities of the gas labeled with C". At various times, determined by the
nature of the experiment, the plants were killed by boiling in ethanol or water. The
resulting suspension was fractionated, and the fractions were assayed for


Author: Eric Holtzman
Publisher: Springer Science & Business Media
ISBN: 9780306431265
Size: 12.22 MB
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... HRP is not inert — some of the isozymes that are abundant in usual HRP
preparations evoke histamine release or other "pharmacological" responses
when injected into animals. And it is even conceivable that oxidation- reduction
reactions catalyzed by the enzyme sometimes damage cells during experiments.
Judging from control experiments — e.g., comparisons of cells exposed to
different tracers — problems of these types with HRP generally are of
manageable magnitude.