The present invention relates to a textile sheetlike structure, in particular for protection against biological and chemical noxiants and poisons, such as biological and chemical warfare agents. More particularly, the system may be used to detect and identify bacteria by detecting the presence of bacterial pili which have been separated from bacterial cells in the sample. Each of the second sidewall portions is shaped to define a plurality of circumferentially spaced structures that are selected from the group consisting of indentations and projections. The coupling element is positioned between the first and second panels and bent to periodically and alternately contact the first and second panels at contact points. The alternative resource identifier is selected as a function of client location information.