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Cerium(iv) ion efficiently hydrolyses the phosphodiester linkages in DNAs, even in the absence of molecular oxygen. The pseudo first-order rate constant for the hydrolysis of thymidylyl-(3',5')thymidine (TpT) by Ce(NH,),(NO,), 7 A marginal activity of La"' for DNA hydrolysis at pH 8.6 (5.3% conversion for 30 day reaction) was claimed 40 years ago: E. Bamann, H. Trapmann and F. Fischler, Biochem. Z . , 1954,326,89. According to another paper, however, La"' is totally inactive for DNA hydrolysis:

A “muscle suit” that provides muscular support for those paralyzed or otherwise unable to move unaided is being developed. The absence of a metal frame and use of McKibben artificial muscles makes the suit lightweight enough for practical use. We propose an armor-like suit and abduction motion is realized. Because it is difficult to implement all upper limb motion in an armor-like suit, we use mechanical joints and a hard frame and all motion is achieved for the upper limb.

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The goo1 of this study was to investigate communication with an intelligent machine such as a human-friendly robot in an environment where human and robot coerist. The face and its expressions are crucial for communication, so we have developed a face robot which has a human-like face and can express facial expre~sions similar to a human being.We used air cylinders with pressurized air /or the Mark I face robot which was 1.5 rimes bigger than human face. In order to realize human face size, we then decided to use elecfricol shape memory alloy (3M) acluators to produce facial expressions (Mark Io. We realized the. human size f m e robot though, SMA did not have enough dwabiliity and power for expressing facial expressions. For Mark .III we then selected McKibben-rype pneumatic actuator to display/icial .&presions. In this paper we show the history of the face robot we have developed, discuss how to build the face robot by using McKibben-ppe pneumatic actuator, and show the basic abilityfor qressing focial expressions.