GLOBAL MARKETS-Shares struggle, yields rise as U.S. rate fears weigh

* Shares slide on strengthened bets on early U.S. rate hike* Too-close-to-call Scotland vote unnerves markets* Santander&aposs Emilio Botin dies, bank&aposs shares weigh* Apple euphoria short-livedBy Jamie McGeeverLONDON, Sept 10 (Reuters) - Global shares struggled on Wednesday as markets added to bets on an early U.S. rate hike while nagging concerns over Scotland&aposs future unnerved investors