** Archer Materials AXE.AX rises 8% to A$0.27; marks biggest intraday pct gain since April 11
** Semiconductor firm signs agreement with UK graphene-based electronics company Paragraf to advance development of Archer's biochip potassium ion sensor to test for chronic kidney disease
** Says deal to be in two stages at total estimated cost of A$450,000 ($288,810)
** About 526,535 shares traded vs the 30-day avg
** Stock trims YTD losses to 53.5%
($1 = A$1.5581)
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.kumar@thomsonreuters.com;))
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