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Article
Very long baseline interferometry at a wavelength of 3.4 mm
In recent years the angular distribution of intensity of the compact cores of quasars and radio galaxies has been mapped in detail by very long baseline interferometry (VLBI) arrays1,2. These observations have sh...
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Article
Reply to Gordon and Judd
ALTHOUGH expressions similar to that of Flory1 have been derived by several authors for the size distribution in branched polymers it has been assumed, implicitly or explicitly, in such derivations that the conve...
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Article
Determination of Oxygen in Iron and Steel
WE have recently applied the method of stable isotope dilution1 to the determination of oxygen in samples of iron and steel which contained low concentrations of this element. As our results are consistently high...
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Article
Bacterial Cellulose for Osmometer Membranes
IN the investigation of the mechanism of polymerization reactions, it is essential to be able to count the number of polymer molecules produced. This implies that the number average molecular weight has to be ...