Progress and challenges in dual‐ and triple‐isotope (δ 18 O, δ 2 H, Δ 17 O) analyses of environmental waters: an international assessment of laboratory performance

2021 ◽  
Author(s):  
L. I. Wassenaar ◽  
S. Terzer‐Wassmuth ◽  
C. Douence
Keyword(s):  
Environmental Waters ◽  
Laboratory Performance ◽  
International Assessment

Slow fronto-occipital potentials, mental category, and laboratory performance.

1969 ◽  
Author(s):  
Robert D. McDonald
Keyword(s):  
Laboratory Performance

Design and laboratory performance of a seed population meter for corn

1973 ◽  
Author(s):  
Chun-Yee Chen
Keyword(s):  
Laboratory Performance ◽  
Seed Population

Influence of Reduced Production Temperatures on the Adhesive Properties of Aggregates and Laboratory Performance of Fine Aggregate-Asphalt Mixtures

2010 ◽  
Vol 11 (1) ◽  
pp. 47-64
Author(s):  
Kamilla L. Vasconcelos ◽  
Amit Bhasin ◽  
Dallas N. Little
Keyword(s):  
Asphalt Mixtures ◽  
Fine Aggregate ◽  
Adhesive Properties ◽  
Laboratory Performance

International Assessment of Unmanned Ground Vehicles

2008 ◽  
Author(s):  
D. P. Sellers ◽  
A. J. Ramsbotham ◽  
Hal Bertrand ◽  
Nicholas Karvonides
Keyword(s):  
Unmanned Ground Vehicles ◽  
Ground Vehicles ◽  
International Assessment

An Improved Membrane Filtration Method for Enumeration of Faecal Coliforms and E. Coli by a Fluorogenic β-Glucuronidase Assay

1993 ◽  
Vol 27 (3-4) ◽  
pp. 267-270 ◽  
Author(s):  
M. T. Augoustinos ◽  
N. A. Grabow ◽  
B. Genthe ◽  
R. Kfir
Keyword(s):  
Escherichia Coli ◽  
Water Samples ◽  
Membrane Filtration ◽  
Faecal Coliforms ◽  
Environmental Waters ◽  
Filtration Method ◽  
E Coli ◽  
Wide Range ◽  
Pure Cultures ◽  
Glucuronidase Assay

A fluorogenic β-glucuronidase assay comprising membrane filtration followed by selective enumeration on m-FC agar at 44.5°C and further confirmation using tlie 4-metliylumbelliferyl-β-D-glucuronide (MUG) containing medium was evaluated for the detection of Escherichia coli in water. A total of 200 typical blue and non-typical blue colonies were isolated from sea and fresh water samples using initial selective enumeration on m-FC agar. Pure cultures of the selected colonies were further tested using the MUG assay and identified using the API 20E method. Of the colonies tested which were shown to be positive using the MUG assay 99.4% were Escherichia coli. The results of this study indicate the combination of the m-FC method followed by the MUG assay to be highly efficient for the selection and confirmation of E. coli from a wide range of environmental waters.

Formulating biossay data of chemicals and environmental water

2000 ◽  
Vol 42 (3-4) ◽  
pp. 115-123 ◽  
Author(s):  
R. Shoji ◽  
A. Sakoda ◽  
Y. Sakai ◽  
M. Suzuki
Keyword(s):  
Water Quality ◽  
Low Density Lipoprotein ◽  
Water Environment ◽  
Density Lipoprotein ◽  
Environmental Water ◽  
Toxicity Data ◽  
Human Beings ◽  
Environmental Waters ◽  
Bodies Of Water

The quality of environmental waters such as rivers is often deteriorated by various kinds of trace and unidentified chemicals despite the recent development of sewage systems and wastewater treatment technologies. In addition to contamination by particular toxicants, complex toxicity due to multi-component chemicals could be much more serious. The environmental situation in bodies of water in Japan led us to apply bioassays for monitoring the water quality of environmental waters in order to express the direct and potential toxicity to human beings and ecosystems rather than determinating concentrations of particular chemicals. However, problems arose from the fact that bioassays for pharmaceutical purposes generally required complicated, time-consuming, expert procedures. Also, a methodology for feedback of the resultant toxicity data to water environment management has not been established yet. To this end, we developed a novel bioassay based on the low-density lipoprotein (LDL) uptake activity of human hepatoblastoma cells. The assay enabled us to directly detect the toxicity of environmental waters within 4 hours of exposure. This is a significantly quick and easy procedure as compared to that of conventional bioassays. The toxicity data for 255 selected chemicals and environmental waters obtained by this method were organized by a mathematical equation in order to make those data much more effectively and practically useful to the management of environmental waters. Our methodology represents a promising example of applying bioassays to monitor environmental water quality and generating potential solutions to the toxicity problems encountered.

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