... garner consisted of replacement of decayed wood; preparation of the wood for conservation by cleaning away dirt, lichens, algae, fungi, and insect damage; conservation of the original wood; stabilization of the original wood; and microbiological monitoring of conserved wood. algae authenticity...

... A QSAR study has been performed using data on the 24-h and 48-h EC50 values for amines to several species of Daphnia . In addition, a QSAR was developed using several species of algae 96-h EC50 data to 18 amines, and provided satisfactory fit to a linear QSAR (EQ 1): log (1/EC50) = 0.49 log P...

... Algal toxicity testing is not new, but only within the past few years have data from such testing been used to help set standards for allowable contamination. Early toxicity testing with marine algae used a few planktonic species with inhibition of growth as the primary endpoint. Results...

... applications were identified: (1) bioassays; (2) bioindicators; (3) bioremediation; and (4) biotechnology. Improvement to research methodologies would include: (1) developing fluorescence bioassays for terrestrial and aquatic plants and algae and combining plant and animal tests to form regionally...

... Periphytic algae are a ubiquitous and ecologically important component of many rivers and streams and are useful for assessing toxicity. Biotic communities in streams near Oak Ridge National Laboratory were apparently impacted by industrial activities; however, no one toxicant had been clearly...

... of well-characterized plant cultures; and (4) ease of culture. Freshwater and marine algae and freshwater and estuarine macrophytes were included in the study. Results showed that the three practical criteria [ 1,3,4 ] all resulted in the selection of unicellular green algae (Chlorophyceae...

... bioassay organisms included: algae, Selenastrum capricornutum ; macroinvertebrates, Daphnia magna ; lettuce seed root elongation, Lactuca sativa L.; and, bacteria (Microtox), Photobacterium phosphoreum . The pH 5.0 sodium acetate leaching media was highly toxic to each of the test organisms...

... research, and to solicit critical review from scientists and regulators prior to formal drafting of Canadian regulatory guidelines. plants algae pesticides regulations phytotoxicity review Canada Kathryn Freemark, 1Patricia MacQuarrie, 2 Stella Swanson, 3and Hans Peterson3 Development...

... The credibility of using an algal plant as a surrogate for vascular plants in chemical toxicity testing was evaluated. Data taken from the PHYTOTOX database were used to estimate what proportion of the chemicals reported to influence vascular plants would also influence algae. The relative...

... Algae are important components of many aquatic communities that can be sensitive to effects of aquatic pollutants. Standard algal toxicity tests quantify effects on population growth over 3 to 14 days. These population growth tests are useful for environmental hazard assessment but have...

..., as indicated by reductions in nitrogen fixation rates and plant growth. Although rates of acetylene reduction (nitrogen fixation) were depressed, plant biomass and the numbers of root nodules produced were simpler, less expensive indices of exposure. In a second test, the responses of algae ( Selenastrum...

... effects on seed germination and seedling growth as criteria of injury. Potential toxicity or stimulation of algae was assessed using Anabaena flos-aquae , Chlorella vulgaris , Skeletonema costatum , and Selenastrum capricornutum . Duckweed, Lemna minor , was used to assess potential phytotoxicity...

... measurement of cell viability was able to distinguish between algicidal and algistatic toxicants. Selenastrum capricornutum toxicity atrazine sodium dodecyl sulfate growth cell viability flow cytometry algae bioassay SDS herbicide William R. Gala ~and John P. Giesy ~ Flow Cytometric...

.... effluents toxicity marine estuarine pulp mill fish mysids algae ammonia discharge permit aquatic toxicology Steven C. Schimmel,' Glen B. Thursby, 2 Margarete A. Heber, 3 and Melissa J. Chammas 4 Case Study of a Marine Discharge: Comparison of Effluent and ReceivingWater Toxicity REFERENCE...

... observable. The fate of the toxicant was also altered by the complex community, in contrast to simpler abiotic fate studies. standardized aquatic microcosm microcosm trophic interactions ecotoxicology community structure aquatic toxicology Daphnia magna algae Wayne G. Landis,' Nancy...

... toxicant treatments, copper eliminated the Daphnia and inhibited primary production; the duration of inhibition was prolonged at the higher copper concentrations. At the lowest concentration, recovery was characterized by an algal bloom of copper-resistant green algae, which was followed by a Daphnia...

... The Vollenweider-Organization for Economic Cooperation and Development (OECD) models are statistical relationships that describe the functioning of aquatic ecosystems in the use of aquatic plant nutrients (nitrogen and phosphorus) for the production of planktonic algae. These models were...

... A toxicity bioassay using the green alga Selenastrum capricornutum and measuring inhibition of photosynthetic carbon-14 ( 14 C)-labeled carbon dioxide ( 14 CO 2 ) assimilation is described. The essential test specifications are the following: ( a ) experimental vessels: 16-mL test tubes; ( b...

... and concurrent algal blooms; at higher concentrations, the algae were inhibited to a greater extent and for a longer duration. The concept of a “days-weighted-by-variable” statistic (DWV) is introduced to assess variation between experiments. The DWV, as a measure of the center of gravity of a microcosm time...

... in the vicinity of containment ponds used to store the waste tailings. Toxicity assessment employing the mixed culture of microorganisms was conducted by monitoring the growth of microbial suspensions through turbidity measurements. Other indices of toxicity employed were the freshwater green alga Selenastrum...