Hansen test

Haleite, Halite = ethylenedinitramine (USA) 126 halogen fluoride 241 hangfire 160 Hansen test 160... 

These tests det the acidity (pH value) of powds which is produced when they are heated for prescribed times and temps (usually 80 to 110°). In the group are the Hansen, Grottanelli and Pavlik tests (qv)... 

Fig. 15-13 Organism mortality as a function of SEM/AVS ratio for a hypothetical sediment. This figure is generalized from results typical of sediment toxicity tests (e.g., Hansen et al, 1996). Organisms evaluated in such tests include amphipods and poly-chaetes. The symbols represent different sediments. The vertical line at 10° is positioned at an SEM/AVS ratio of 1.0 the horizontal line at 24% represents the limit of toxicity, that is, mortality 24% is defined as not the consequence of toxicity.

Hansen, N.K. and Coppens, P. (1978) Testing aspherical atoms refinements on small-molecule data... 

The protocols of analytical methods and bioassays include the sampling and preparation steps of the test matrix before the test procedures. The sampling should be conducted in accordance with ISO 5667-16. There are already available harmonised protocols according to Hansen et al. [49]. The statistics of the ecotoxicity data should be conducted in accordance with ISO/CD 20281. 

The ISO protocol for the biochemical response EROD (ISO 23893-2/AWI) as a recent example of a bioanalytical (biomarker) [49,50] method standardised under ISO for fish needs harmonisation with the other test systems and between the laboratories (users) before implementation. Use of biomarkers (biochemical responses) in multi-arrays for environmental monitoring according to Hansen et al. [50] is complementary to chemical analysis since they can alert for the presence of ecotoxic compounds. Bringing into the WFD, the effect-related approaches concerning bioassays and biomarkers are only relevant in the context of the QN of environmental relevant substances and the good chemical status. But it is rather difficult to transfer the monitored biochemical responses or biomarkers into an operational effect-related standard. They serve as the basis for environmental protection against hazardous substances. In relation to... 

Cripe, G.M., D J. Hansen, S.F. Macauley, and J. Forester. 1986. Effects of diet quantity on sheepshead minnows (Cyprinodon variegatus) during early fife-stage exposures to chlorpyrifos. Pages 450-46 in T.M. Poston and R. Purdy (eds.). Aquatic toxicology and environmental fate ninth symposium. ASTM Spec. Tech. Publ. 921, American Society for Testing and Materials, Philadelphia, PA. 

Goodman, L.R., D.J. Hansen, G.M. Cripe, D.P. Middaugh, and J.C. Moore. 1985b. A new early life-stage toxicity test using the California grunion (Leuresthes tenuis) and results with chlorpyrifos. Ecotoxicol. Environ. Safety 10 12-21. 

Hansen, S.R. and R.R. Garton. 1982. Ability of standard toxicity tests to predict the effects of the insecticide diflubenzuron on laboratory stream communities. Canad. Jour. Fish. Aquat. Sci. 39 1273-1288. 

Hansen, D.J., L.R. Goodman, J.C. Moore, and P.K. Higdon. 1983. Effects of the synthetic pyrethroids AC 222, 705, permethrin and fenvalerate on sheepshead minnows in early life stage toxicity tests. Environ. Toxicol. Chem. 2 251-258. 

Habert, R. and Picon, R. (1984). Testosterone, dihytrostestosterone and estradiol-17/ levels in maternal and fetal plasma and in fetal testes in the rat. J. Steroid Biochem. 21 183-198. Hansen, D.K. and Hodes, M.E. (1983). Comparative teratogenicity of phenytoin among several inbred strains of mice. Teratology 28 175-179. 

The amount of vitamin B6 required by humans is not well established,73 and only recently has evidence been obtained that the needs are variable. Hansen and Bessey74 have found that in some babies 3 or 4 times as much vitamin B6 is needed to prevent the excretion of xanthurenic acid after a test dose of tryptophane than in others. It is these particular babies who develop clinical vitamin B6 deficiency when the intake is low. These findings seem to indicate strongly that some babies have vitamin B6 requirements 3 or 4 times as high as others. 

Bailey, H.D., Liu, D.H.W., and Javitz, H.A. Time/toxicity relationships in short-term static, dynamic and plug-flow bioassays, in Aquatic Toxicology and Hazard Assessment Eighth Symposium, ASTM Special Technical Publication 891, Bahner, R.C. and Hansen, D.J., Eds. (Philadelphia, PA American Society for Testing and Materials, 1985), pp. 193-212. 

Hansen, D J., Goodman, L.R., Gripe, G.M., and Macauley, S.F. Early life-stage toxicity test methods for gulf toadfish (Opsanus beta) and results using chlorpyrifos, Ecotoxlcol. Environ. Saf., 11 (1) 15-22, 1986. 

Waggy, G.T., Conway, R.A., Hansen, J.L., and Blessing, R.L. Comparison of 20-dBOD and OECD closed-bottlebiodegration tests. Environ. Toxicol. Chem., 13(8) 1277-1280, 1994. 

The reliable experimental information on the absolute scale and thermal vibrations of beryllium metal made it possible to analyze the effect of the model on the least-squares scale factor, and test for a possible expansion of the 1 s core electron shell. The 0.03 A y-ray structure factors were found to be 0.7% lower than the LH data, when the scale factor from a high-order refinement (sin 6/X) > 0.65 A l) is applied. Larsen and Hansen (1984) conclude that because of the delocalization of the valence electrons, it is doubtful that diffraction data from a metallic substance can be determined reliably by high-order refinement, even with very high sin 0/X cut-off values. This conclusion, while valid for the lighter main-group metals, may not fully apply to metals of the transition elements, which have much heavier cores and show more directional bonding. 

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