As soon as extensively thought of an impossibility--the stuff of technology fiction novels--time go back and forth may possibly eventually be accomplished within the twenty-first century. In Breaking the Time Barrier, bestselling writer Jenny Randles unearths the character of contemporary, step forward experiments which are turning this delusion into truth.
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Chemama and M. Frilley, Bulletin du Cancer 6£, 41 (1973). 9. S. Apelgot, R. Chemama and M. Frilley in_ "Liquid scintillation counting: Recent developments", p. E. A. Y. and London (1974). 45 HETEROGENEOUS COUNTING ON FILTER SUPPORT MEDIA E. Long, V. J. Kelly Beckman Instruments Inc. Scientific Instruments Division Irvine, CA 92713 Abstract Many investigators in the biomedicai research area have used filter paper as the support upon which radioactive samples are counted. This means that a heterogeneous count ing of sample sometimes results.
Chem. 46, 1725 (1974). N. Y. Chu, Anal. Chem. 43, 449 (1971). G. H. Coleman, The radiochemistry of plutonium, Report NAS-NS 3035 (1965). P. T. Perdue, D. J. Christian, J. H. Thorngate and W. J. McDowell, J. Inorg. Nucl. Chem. (in press). 31 Measurement by Liquid Scintillator of Labelled Compounds ( H or lkC) Dropped onto Supports Sonia Apelgot and Maurice Duquesne Laboratoire Curie de la Fondation Curie - Institut du Radium 11 rue P. et M. Curie. 75231 Paris Cedex 05 (FRANCE) Abstract Radioactive compounds dropped onto supports are measured correctly, even if not extracted by liquid scintil lator.
Each support was dried then immersed in 1 ml of NE211. 5% (v/v) of chloroform, to the sample thus giving the a spectrum. The amplitudes are given in arbi trary units, with the intensities normalised on the SIE spectrum. Σ Ni represents the total number of counted pulses. 38 MEASUREMENT OF LABELLED COMPOUNDS Conversely, this degree of measurement efficiency depends on the size of tritiated compounds (thymidine or DNA). These phenomena do not exist, either with compounds labelled with C (Table II) or with tritiated compounds dropped onto a glass fibre support (Table 1 ) .
Beyond the Barriers of Space and Time