evolutionary topic in microbiology for master degree

Hi.. i'm Asma , 

I'm amicrobiolgist .. i've lately started my master degree in micobiolology but i haven't signed in yet. in fact i've became very confused in choosing the matter of master study. you know, threre're a huge amount of topics and research submitted every day. and i hope to do my master in apartially new topic with  evolutionary applications, especially in new fields that connect microbiology with chemistry,medicine or even physics (there're really new resaerchs gathering both microbiology with the last field ).. So i can't make any progress yet because i still can't make that good choice ..

So, if you have any recommendations here for me ,and i'm sure you do.. i'll be very grateful ..

thanks