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The electron paramagnetic resonance (EPR) of the triplet excited state of solutions of a series of porphyrins and aromatic amino-acids has been studied at 77°K. It has been shown that for some of the compounds it is possible to observe EPR for transitions with It has been shown that photoreactions in solid solutions of porphyrins and aromatic Reactions of photosensitized deamination of aliphatic amino-acids in solid aqueous A M = & l , &2. amino-acids proceed through the triplet excited state. solutions at 77°K by aromatic compounds have been studied.

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We the undersigned were scientific colleagues and friends of Aharon Katzir Katchalsky. Your readers will know of his tragic death, in company with 25 others, at the hands of terrorists in the airport at Lod. We write not only to mourn the loss of an old friend and one of the greatest scientists to emerge from Israel, but also to express our horror at so indiscriminate and so futile a waste of rare human resources. Aharon Katchalsky was vigorous in the pursuit of scientific research of a most distinguished kind, and also found time to play a leading part in all kinds of international organizations and activities to the extent that he seemed to be a citizen of the world rather than

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From the late 1960s until the mid 1980s many projects conducted research on superconducting power transmission systems. The culmination was the testing of a prototype system rated for 1000 M V A -a power level suitable for initial trials in a utility system. The specific design adopted for each development produced differing requirements for the conductor, dielectric insulation. cooling system and the cryogenic enclosure. Similar constraints apply to a design based on the use of high-c superconductors. If superconducting systems are to become a commercial reality they must fill a technical niche in the overall power delivery system and be economically competitive with conventional equipment. A detailed cost estimate for an 800 MVA superconducting power transmission system indicates the priorities that must be given in a research and development programme so that the most expensive components can be developed to achieve lower costs and at the same time improve the operational performance.