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The development of a large size gaseous detector of single photons, able to stably operate at high gain and high rate, and to provide good time resolution and insensitivity to magnetic field would be beneficial to future Cherenkov Imaging Counters. The detector could be based on the use of a multilayer architecture of THGEM electron multipliers coupled to a solid state CsI photocathode. A systematic study of the response of THGEM-based counters versus the geometrical

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Comparative studies in thylakoids and oxygen-evolving Triton X-100 PS II membrane fragments reveal: (i) There exists one high-affinity atrazine binding site per PS II in both preparations. The affinity is reduced in PS II membrane fragments. (ii) The susceptibility to tryptic attack on atrazine binding and p-BQ-mediated electron transport is markedly reduced by CaC12 in PS II membrane fragments, but no protection is observed in thylakoids. NH20H and Ks[Fe(CN),] both reduce the binding affinity in PS II membrane fragments. The action of NH20H is invariant to CaC12 addition. The implications of these findings for functional studies with PS II membrane fragments are discussed. Photosystem II membrane fragment A trazine binding Trypsin effect CaCIJprotection Hydroxylamine effectPotassium ferricyanide effect

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