Allen test

Allen test evaluates functioning of the medial and ulnar arteries. Occlude the two arteries and have the patient open and close his fist. The palm should be pale. Release one artery and the hand should flush. Repeat with the other artery. 

Allen test for progesterone aided in the search for the hormone, and in 1934 four laboratories independently isolated progesterone (LXXIV, A -pregnene-3,20-dione) from the corpus luteum. Its structure was quickly elucidated. Progesterone has also been isolated from ox adrenals, - human placenta, - and hog testis. ... 

Knight and Allen. This is a copper reduction method for reducing sugars in white sugar up to 0.02%. It utilizes EDTA to determine excess unreacted copper. Tests undertaken in 1994 to extend the range of this method were unsuccesshil. In spite of poor performance in ring tests, it remains an official ICUMSA method. 

Comparative tests performed on a Ro-Tap unit, a vibrating unit (Sonic Sifter — Allen-Bradley), and the Alpine Air Jet Sieve are shown in Figs 6 and 7. Fig 6 is a powdered cement Fig 7 is cadmium stearate, a waxlike material which clogs easily. These separations were all made on a 42 micron mesh sieve. These tests showed that the Alpine Jet Sieve effected good separations in a matter of minutes compared with the much longer times required for the other systems... 

Mackenzie, A.E., Allen, G., Lahey, D., Crossen, M.L., Nolan, K., Mettler, G., Worton, R.G., MacLen-nan, D.H., Korneluk, R. (1991). A comparison of the caffeine halothane muscle contracture test with the molecular genetic diagnosis of malignant hyperthermia. Anesthesiology 75,4-8. 

Mice exposed to 2,000 ppm of trichloroethylene, 4 hours/day for a 5-day period, had a significant increase in abnormal sperm morphology of 1% 28 days after the exposure (Land et al. 1981). No effect was seen at 200 ppm. A 6% increase in abnormal sperm was observed 4 weeks, but not 4 days or 10 weeks, after mice were exposed to 100 ppm trichloroethylene 7 hours per day for 5 days (Beliles et al. 1980). Based on the time after exposure at which sperm were affected, the study authors indicated that trichloroethylene damages sperm precursor cells but that spermatogonia were either unaffected or were capable of recovery. Reproductive performance was not tested in these studies. Another mouse study tested the effects of a 5-day exposure (6 hours/day) on spermatid micronuclei frequency no effects were observed at exposure levels of up to 500 ppm, the highest concentration tested (Allen et al. 1994). These results were interpreted as evidence that trichloroethylene did not cause meiotic chromosome breakage or loss. No treatment-related reproductive effects were seen in female rats exposed to 1,800 ppm trichloroethylene for 2 weeks (6 hours/day, 7 days/week) before mating (Dorfmueller et al. 1979). 

Shumaker, Wayne. "Literary Hermeticism some test cases." In Hermeticism and the Renaissance intellectual history and the occult in early modern Europe, eds. Ingrid Merkel and Allen George Debus, 293-294. Washington (DC) Folger Shakespeare Library, 1988. 

Hough, E.U. and Allen T.O. "Laboratory Techniques and Results of Tests to Determine Formation Damage from Fracturing Fluids," 1957 Spring Meeting of the Southern District Division of Production, Shreveport, March 20-22. 

The same pseudo-ensemble concept has been used by Camp and Allen [44] to obtain a pseudo-Gibbs method in which particle transfers are substituted by volume fluctuations of the two phases. The volume fluctuations are unrelated to the ones required for pressure equality (10.7) but are instead designed to correct imbalances in the chemical potentials of some of the components detected, for example, by test particle insertions. 

Dienes such as 90 can be accessed by a multi-component reaction under ruthenium catalysis involving an allene 88 and an enone (methyl vinyl ketone in this case), with cerium(m) chloride as an additive in DMF (Scheme 26).95,96 With an allene concentration of 0.25 M, yields are moderate to good. Different ruthenium catalysts and additives were tested in order to optimize this reaction. CpRu(COD)Cl 89 and CpRu(MeCN)3PF6 appeared to be more versatile ones. The mono-, di-, tri-, and tetrasubstituted allenes have been investigated with methyl vinyl... 

Richardson, C., Williams, D.A., Allen, J.A., Amphlett, G., Changer, D.O. and Phillips, B. (1989). Analysis of data from in vitro cytogenetic assays. In UKEMS Sub-committee on Guidelines for Mutagenicity Testing. Report. Part III. Statistical Evaluation of Mutagenicity Test Data. (Kirkland, D.J., Ed.). Cambridge University Press, pp. 141-154. 

Using the data of Fig. 38 and data obtained by attempting to duplicate the run, Allen and her coworkers determined the activity coefficients presented in Fig. 39. The two sets of data arc in quite good agreement except at lower mole fractions of DBO, which correspond to the later phases of a run when contamination became significant. Since the activity coefficients for each of the two species were determined from the data, the consistency of the results can be tested by applying the Gibbs-Duhem equation,... 

Reay, D. and Allen, R.W.K., Predicting the performance of a continuous well-mixed fluid bed dryer from batch tests, in Ashworth, J., (ed.). Proceedings of the Third International Drying Symposium, volume 2, Birmingham, 1982, 130-140. 

The reaction is versatile and proceeds with a variety of cyclic and acylic alkenes substituted with alkyl, aryl, vinyl and heteroatom substituents. Allene derivatives also undergo cycloaddition with nitrones ". A variety of cyclic and acyclic aliphatic nitrones bearing aliphatic and aromatic substituents has been tested. The reaction is, however, relatively sensitive to steric constraints and proceeds easily only for mono- and disubstituted alkenes. Steric requirements for a nitrone molecule are similar and, although several reactions with R, R2 are known, good yield has been achieved only with R = H (equation 105). 

Keefe DO, Allen C, Besenhruch G, Brown L, Norman J, Sharp R (1982) Preliminary results from bench-scale testing of a sulfur-iodine thermochemical water splitting cycle. Int J Hydrogen Energy 7 381-392... 

Allen, H. C J. M. Laux, R. Vogt, B. J. Finlayson-Pitts, and J. C. Hemminger, Water-Induced Reorganization of Ultrathin Nitrate Films on NaCI Implications for the Tropospheric Chemistry of Sea Salt Particles, J. Phys. Chem., 100, 6371-6375 (1996). Allen, M., and M. L. Delitsky, A Test of Odd-Oxygen Photochemistry Using Spacelab 3 Atmospheric Trace Molecule Spectroscopy Observations, J. Geophys. Res., 96, 12883-12891 (1991). 

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