Estimation of unknown pesticide levels in experimental samples is an important aspect of many agricultural and environmental studies. Such measurements are often made utilizing a “standard” dose response curve. This methodology compares the biological response of a target organism at known dosages to the response of the same organism exposed to an unknown sample. These “bioassays” are typically...

Rhopalosiphum padi L. causes significant damage to winter wheat (Triticum aestivum L.), even without obvious aboveground symptoms of injury. Our objectives were to develop a juvenile-plant bioassay for bird cherry-oat aphid (BCOA) resistance that allows rapid phenotypic differentiation. Central features of the bioassay include root and shoot weight measurements of 3-week-old seedlings produced ...

The linear correlation between the EC50 values of 50 substances obtained in luminescence bioassays using Vibrio fischeri and Vibrio harveyi and in a fluorogenic bioassay using Escherichia coli was investigated. As a result, a significant correlation was found between the said values in all three toxicity tests. The bioassay using V. harveyi had a sensitivity similar to that of the fluorogenic b...

A wind tunnel bioassay system to screen mosquito repellents is described. A wind tunnel is utilized to exploit the upwind flight response of host-seeking mosquitoes. Mosquitoes within the wind tunnel are activated with human breath, fly upwind, and land on heated chick skins. This behavioral sequence results in a consistently high percentage of the test population approaching repellent or contr...

In 1983, the Radiation Protection Bureau of the federal Department of Health was formally recognized by the Canadian nuclear industry regulator, the Atomic Energy Control Board (AECB) as the National Calibration Reference Centre (NCRC, the Centre) for Bioassay and In Vivo Measurements. The Centre’s mandate was to provide practical reference standards to the AECB’s licensees for measurements the...

Dipsaci Radix has been proved to represent an effective treatment strategy for Alzheimer's disease (AD), but the potential active components in have not evaluated by AD-related bioassay. In this study, water fraction of had shown highest inhibitory effect on activity tests, including inhibition acetylcholinesterase (AChE), butyrylcholinesterase (BChE), β-site amyloid precursor protein cleaving ...

Taylor et al. (1993) described a pollutant bioassay based upon a change in the rate at which Gammarus pulex (L.) consumes a novel food source (eggs of the brine shrimp Anemia salina) when the animals are stressed by exposure to a pollutant. The bioassay is rapid and non-destructive, and produces results with less variation than reported using conventional leaf-feeding bioassays. However, it is ...

Some degree of error is inevitable in multi-agent bioassays regardless of design or measurement technology. Estimation error can be reduced post facto by exploiting the matrix partial ordering of the bioassay survival estimates. The standard method for this is order-restricted regression (ORR). If the joint action of the bioassay agents admits a tolerance-based interpretation, additional struct...

Summiary. Parameters of the bioassay based on the gibberellin-indluced reducing suigar release of barley endosperm were investigated. Procedures for the rapid handling and processing of utp to several hundred treatments witholut loss in sensitivity of the test are described, and the effects of variations in many aspects of the bioassay were assessed. In general, the variations in varieties, tec...