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Andy Platt and his colleagues are shortly to report that several of their bimetallic materials show increased cytotoxicity to L929 murine tumour cells than either of the ' parent ' monometallic halves of the complex . Parents also emphasised outcomes , quality , organisation and access to healthcare as important , and drew attention to the complex and challenging nature of the professional-parent relationship . At times she argues that the key relationships are with the parents and students schools serve , and indeed , the educator-student relationship is central to the complex educational enterprise . Parents have a complex task of guiding a specific child to maturity by using the opportunities offered by the environment , while avoiding its detrimental aspects . The slowness of schools to use the Web to communicate to parents about their students ' curriculum , progress , homework , or on a variety of other topics may be rooted in a complex array of factors-lack of technical skills on the part of teachers , difficulty of maintaining websites , and privacy concerns .