BUZZ-Australia's Qube Holdings falls as Brookfield tightens its grip on Asciano
** Logistics services provider Qube Holdings Ltd falls as much as 4.3 pct to A$2.23, the lowest since Oct 30
** Qube's Canadian rival Brookfield Asset Management Inc stiffens the takeover battle by buying 19.2 pct stake in target Asciano Ltd
** Brookfield says it plans to launch a formal takeover offer, directly pitching it to Asciano's shareholders
** Qube and partners had earlier acquired a 19.99 pct stake in Asciano; Qube also said it planned to buy Asciano assets as well
** Stock had lost 4.1 pct this year as of Thursday's close (Reuters Messaging: email@example.com)
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