The larvicidal efficacy of Calopogonium mucunoides leaf and Chrysophyllum albidum seed extract against 2nd 3rd larval instars Aedes aegypti was investigated in an acute bioassay. bioassay done triplicate ten laboratory-reared larvae Ae. at four different concentrations (250, 500, 750, 1000 ppm) with a simultaneous control 24 h, 48 72 h exposure. Phytochemical screening revealed the presence alk...

So far, the only insect that has evolved resistance in the field to Bacillus thuringiensis toxins is the diamondback moth (Plutella xylostella). Documentation and analysis of resistant strains rely on comparisons with laboratory strains that have not been exposed to B. thuringiensis toxins. Previously published reports show considerable variation among laboratories in responses of unselected la...

Introduction: Bioassay is necessary for assessment of pollution. Because physical and chemical taste are not enough for assessment of potential effects on water ecosystem. Bioassay tests have alot of scientific value inanition doing of them is easy and need less time, also need less space, laboratory equipment’s and expenditure. Therefor such tests have found special attention in water pollutio...

For radionuclides such as plutonium and americium, detection of removable activity in the nose (i.e., nasal swab measurements) are frequently used to determine whether follow-up bioassay measurements are warranted following a potential intake. For this paper, the authors analyzed 429 nasal swab measurements taken following incidents or suspicious circumstances (such as an air monitor alarming) ...

Plant species act as natural bioindicators of atmospheric pollutants. Plants can be used as bioassay systems for monitoring atmospheric pollutants. Plant injury symptoms, altered growth and reproductive pattern, changes in yield and/or productivity, and changes in species distribution can be used singly or in combination as monitoring devices. The results must be accepted as semiquantitative, b...

One of the uses of aquatic bioassays is to determine the presence or absence of toxic contaminants in water from the field. Our Laboratory has developed a bioassay system for this purpose using larvae of the pitcher-plant mosquito, W eom ia smithii (Coquillett) (Strickman 1984). V The major app lcation of this system is the investigation of minor fish kills which may occur at any U.S. Air Force...

The objective of this work is to develop procedures for internal monitoring of (18)F to be applied in cases of possible incorporation of fluoride and (18)FDG, using in vivo and in vitro methods of measurements. The Na I (Tl) 8" x 4" scintillation detector installed at IRD-Whole Body Counter was calibrated for measurements with a whole body anthropomorphic phantom, simulating homogeneous distrib...

Harmful algal bloom (HAB) dinoflagellate species Karlodinium veneficum and Prorocentrum cordatum (prev. P. minimum) are commonly found in Chesapeake Bay during the late spring early summer months, coinciding with spawning season of eastern oyster (Crassostrea virginica). Unexplained larval mortalities at regional commercial hatcheries prompted screening hatchery water samples for these HAB spec...

Dose assessment after intakes of radionuclides requires application of biokinetic and dosimetric models and assumptions about factors influencing the final result. In 2006, a document giving guidance for such assessment was published, commonly referred to as the IDEAS Guidelines. Following its publication, a working group within the European networks CONRAD and EURADOS was established to improv...

Bioassays can be used to estimate the initial intake I for the case of an acute intake exposure for an individual worker. To evaluate the effective dose, apart from I, we need to know other parameters such as activity median aerodynamic diameter (AMAD) or the fraction absorption ( f(1)) in the blood from the GI tract, but in an accident situation these parameters are often unknown. The bioassay...