Abstract: An apparatus for supporting a sensor configured to monitor loading of particulate material through an open top of a containment structure, which includes a covering sheet movable between an extended position in which the sheet spans across the open top to substantially enclose an interior of the structure and a retracted position in which the open top is substantially unobstructed by the sheet so that the particulate material can be suitably loaded into the interior, comprises a sensor support arm mounted to the containment structure at a location within a periphery thereof and lying along a movement path of the covering sheet between its two positions. The sensor is mounted on a raised distal end of the arm still located within the structure periphery. The arm is movable to a lowered transport position responsive to the movement of the covering sheet from the retracted to the extended position.

Abstract: The efficiency of photo-induced electron transfer reactions is increased and the back transfer of electrons in such reactions is greatly reduced when a photo-sensitizer zinc porphyrin-surfactant and an electron donor manganese porphyrin-surfactant are admixed into phospho-lipid membranes. The phospholipids comprising said membranes are selected from phospholipids whose head portions are negatively charged. Said membranes are contacted with an aqueous medium in which an essentially neutral viologen electron acceptor is admixed. Catalysts capable of transfering electrons from reduced viologen electron acceptor to hydrogen to produce elemental hydrogen are also included in the aqueous medium. An oxidizable olefin is also admixed in the phospholipid for the purpose of combining with oxygen that coordinates with oxidized electron donor manganese porphyrin-surfactant.