d-Tubocurarine in Caesarean Section

Polyethylene: Preparation, Structure, And Properties

“…Exposure of 4-mil film and 1-in. rod to -irradiation from Co60 resulted in a small reduction in tensile strength, a progressive drastic reduction in elongation and tear strength, a reduction in viscoelastic deformation and heat distortion, and alteration in the infrared spectra in agreement with Dole (116), i.e., increased absorption at 2.9 µ (-OH), 5.85 µ (^Co'j , and 10.35µ (RCH=CHR) (21). It was shown that most of the carbonyl absorption took place at the surface and that the unsaturation absorption was essentially independent of sample thickness, confirming the conclusion that unsaturation develops from ionizing radiation and that oxidation is a surface phenomenon.…”

Production and Isolation of Carrier-Free Radioisotopes.

“…Because of the great variety of nuclear transmutation reactions (115,116) which can be brought about by bombardment with deuterons, protons, and alpha particles, it is frequently possible to produce a desired radioisotope by several different types of nuclear reactions. In determining the particular reaction to be employed, several factors must be considered, including (1) the yield of the desired radioisotope, (#) the relative yields of the possible concurrent side reactions, (3) the problem of the ultimate chemical separations of the desired product, and (4) the chemical and physical limitations which must necessarily be imposed in the choice of target material for charged-particle bombardment. Considerations 1 and 2 are discussed below and 3 and 4 are covered in the section on separation procedures.…”

“…Radioelements which have been isolated in the carrier-free state by methods involving electrodeposition reactions include (1) electronegative elements which are reduced to the metallic state by displacement with a more electropositive element or by an applied electromotive force, (#) elements which form insoluble oxides by anodic oxidation reactions, and (5) elements which form insoluble compounds with the electrode material as a result of either cathodic or anodic reactions. Carrier-free radioisotopes which have been separated by electrodeposition reactions are given in table 5.…”

“…Oxides of nitrogen are removed by distillation. The residue is treated with H3P03 and the I131 is distilled into Na0H-Na2S03 solution (1,110).…”

“…In the separation and use of radioactive substances it is frequently necessary to isolate radioisotope preparations which do not contain detectable amounts of stable isotopic material. These preparations, usually designated by the term "carrier-free," are produced principally by nuclear transmutation reactions.2 1 This document is based on work performed under Contract No. 7405-eng-48 for the Atomic Energy Commission.…”