?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Revisiting+the+microtubule+based+quantum+models+of+mind%3A+tubulin+bound+GTP+cannot+pump+microtubule+coherence+or+provide+energy+for+alpha+%3C-%3E+beta+computation+in+stable+microtubules&rft.creator=Georgiev%2C+Danko&rft.subject=Biophysics&rft.description=The+current+paper+investigates+the+biological+models+of+stable+brain+microtubules+as+quantum+or+classical+computers+whose+function+is+based+on+electron+hopping+associated+with+kinking+of+the+tubulin+dimer.+Hameroff+(1998a%2C+1998b%2C+2003a%2C+2003b)%2C+Tuszynski+et+al.+(1998)%2C+Hagan+et+al.+(2000)%2C+Mershin+et+al.+(1999)%3B+Mershin+(2003)+suppose+that+the+energy+needed+could+be+somehow+delivered+via+guanosine+diphosphate+(GDP)+exchange+for+guanosine+triphosphate+(GTP)+or+via+cycles+of+tubulin+bound+GTP+hydrolysis.+Here+is+presented+biological+and+structural+data+from+electron+diffraction+studies+performed+by+Lowe+et+al.+(2001)+and+computer+simulation+with+MDL+%C2%AE+Chime+Version+2.6+SP4%2C+explaining+and+visualizing+the+inconsistency+of+the+proposed+tubulin+bit+(qubit)+GTP+energized+alpha+%3C-%3E+beta+computation+and%2For+tubulin+bound+GTP+pumped+coherence+in+stable+microtubules.&rft.date=2003-10&rft.type=Preprint&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F3251%2F1%2FGTP.pdf&rft.identifier=++Georgiev%2C+Danko++(2003)+Revisiting+the+microtubule+based+quantum+models+of+mind%3A+tubulin+bound+GTP+cannot+pump+microtubule+coherence+or+provide+energy+for+alpha+%3C-%3E+beta+computation+in+stable+microtubules.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F3251%2F