Keller test

Leaflets + HgO from HgO. M.p. 238 deoomp. [a] 4- 40° in Py. Sol. Py. Spar. sol. most org. solvents. Amphoteric. Gives characteristic blue Keller test of ergot alkaloids. 

Stumpf M, Dobbyn A J, Keller H-M, Hase W L and Schinke R 1995 Quantum mechanical study of the unimolecular dissociation of HO2 a rigorous test of RRKM theory J. Chem. Phys. 102 5867-70... 

Keller, C.E., Utility of Shock Models for Underground Nuclear Tests, in Shock Waves in Condensed Matter—1983 (edited by Asay, J.R., Graham, R.A., and Straub, G.K.), North-Holland Physics, Amsterdam, 1984, pp. 485-487. 

Keller, J. C., Hammond, B. D., Kowlay, K. K. Brauer, G. M. (1988). Biological evaluation of zinc hexyl vanillate cement using two in vivo test methods. Dental Materials, 4, 341-50. 

Davidson, E. A., Keller, M., Erickson, H. E., Verchot, L. V., and Veldkamp, E. (2000). Testing a conceptual model of soil emissions of nitrous and nitric oxide. Bioscience 50, 667-680. 

In an attempt to synthesize 2-desoxy-L-ribose, Mukherjee and Todd68 treated methyl 2,3-anhydro-jS-L-ribopyranoside (LXXII) with sodium thiomethoxide and then reduced the amorphous product. The sulfur-free sirup thus obtained was inert to the action of periodate and is therefore methyl 3-desoxy-/3-L-riboside (ayn., methyl 3-desoxy-/3-L-xyloside) (LXXIV) rather than the desired 2-desoxy derivative. The methylthio intermediate (LXXIII) was consequently a 3-methylthio-L-xylose derivative rather than a 2-methylthio-L-arabinose compound. The presence of a trace of the latter, however, is not wholly excluded since the sirupy desoxypentoside (LXXIV) gave a feeble green coloration in the Keller-Kiliani test, a reaction generally accepted as being specific for 2-desoxy-sugars. 

The recommended technique for determination of abrasion pH is to grind, in a nonreactive mortar, a small amount of the mineral in a few drops of water for about one minute. Usually, a pH test paper is used. Values obtained in this manner are given in the left-hand column of the accompanying table. Another method, proposed by Keller etal. in 1963 involves the grinding of 10 grains of crushed mineral m 100 milliliters of water and noting the pH of the resulting slurry electronically. 

Lancaster V, Keller-McNulty S (1998) Environ Test Anal 7 15. 

A volatile iodine species, neither elemental nor organic, which has been found in steam/air atmospheres, has been identified as hypoiodous acid (HOI) (Cartan et al., 1968). In water-cooled power reactors, any fission products released from fuel will pass into hot alkaline water and thence to a steam-air mixture. These conditions are thought to favour the formation of HOI (Keller et al., 1970), but the evidence is indirect. For example, tests for elemental iodine or iodine with an oxidation state higher than that of HOI gave negative results. 

Keller, A.E., Ruessler, D.S. and Chaffee, C.M. (1998) Testing the toxicity of sediments contaminated with diesel fuel using glochidia and juvenile mussels (Bivalvia, Unionidae), Aquatic Ecosystem Health and... 

Bier, W., Keller, W., Linder, G., Seidel, D., Schubert, K., Manufacturing and testing of compact micro heat exchangers with high volumetric heat transfer coefficients, ASME, DSC-Microstructures, Sensors, and Actuators 1990, 19, 189-197. 

Chemical test kits advertised by mail order for checking out alleged psychedelics generally rely on the Keller and van Urk-Smith color-change tests. In these, the sample to be examined is poured into a reagent with the resulting color then compared with standards. Albert Hofmann has described these processes as they relate to LSD ... 

Layer P, Keller J How to make use of pancreatic function tests, in Buechler M (ed) Chronic Pancreatitis Novel Concepts in Biology and Therapy. Blackwell Science, Oxford, UK, 2002, pp. 233-242. 

At the end of each collection period, the volume is recorded, and the bicarbonate content determined titri-metrically. Furthermore, pancreatic enzymes, such as amylase, are determined in the samples. Determination of protein concentrations in the pancreatic juice can be used as end-point since the total protein concentration is proportional to the individual enzymes (Keller et al. 1958). In a pre-test period of 10 min, samples are collected every 2 min. Then, the test compound is injected intravenously and the pancreatic juice is collected every 2 min. 

Durham RA, Sawyer DC, Keller WF, Wheeler CA (1992) Topical ocular anesthetics in ocular irritancy testing a review. Lab Anim Sci 42 535-541... 

The results of inhalation studies conducted in experimental animals have been fairly consistent across species. It has been suggested that benzene fetotoxicity in animals is a function of maternal toxicity because the joint occurrence of a decrease in fetal weight and an increase in skeletal variants usually occurs when there is a decrease in maternal weight (Tatrai et al. 1980b). However, the mechanism underlying developmental toxicity has not been fully elucidated, and there are few data on the effect of benzene on maternal food consumption and on blood levels of benzene and its metabolites in the dams and their fetuses. There are apparently none of the usual fetotoxic findings after exposure in utero to low concentrations of benzene ( 10 ppm) (Coate et al. 1984 Kuna and Kapp 1981). As stated above, there is evidence for persistent hematopoietic anomalies in animals exposed in utero to benzene at 20 ppm (Keller and Snyder 1988). They may also exist at lower concentrations, but adequate testing has not been performed. 

A wide variety of metal oxides were screened by Keller and Bhasin in their pioneering investigation into methane dimerization. Since then, many catalysts have been developed and tested (2-6). However, due to the thermal stability of methane, even in the presence of oxidizers, conversion is extremely low. To date, total yields of C2 products of 15 to 207. 2, 4) are considered high. 

The search of the literature carried out for this survey, allows us to estimate that approximately 90% of all toxaphene separation were carried out on non-polar stationary phases similar to 95% methyl-/5% phenylpolysiloxane and commercially available under the trade names DB 5, CP-Sil 8, HP-5, Ultra 2, Rtx 8, SE 52, etc. Two reports in the literature suggest the use of non-polar only. Alder et al. mentioned the decomposition of B8-1413 (P-26) and B9-1025 (P-62) on the polar DX-4 phase [145]. Baycan-Keller and Oehme tested four different stationary phases (capillary length 12 to 30 m) and found a remarkable decomposition of labile toxaphene compounds on 90% dicyanopropyl-/10% phenylcyanopropyl-polysiloxane (Rtx-2330) [146]. Therefore, the exclusive use of non-polar stationary phases was recommended for the quantification of toxaphene as well as a second column for confirmation of the results. A very non-polar stationary phase (CP-Sil 2) was suggested for the congener-specific separation of toxaphene [147,148]. 

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