In your case is it really a matter of what is "legal" or of what is needed
for the work being done?  I suspect that Allen is right and that your
heating may spoil the work being studied.
 
For "legal" you should refer to your national (US?) standards.  Here in
Canada the 1996 Honey Regualtions define quote:
"pasteurized", in relation to honey, means treated in a registered
pasteurizing palnt by the controlled application of heat so that the honey
is free of viable sugar-tolerant yeasts;  - end  of quote.
 
On page 902 the 1992 edition of The Hive and the Honey Bee shows a table
based on Townsend's work that shows the time and temperature relationships
required to kill yeasts in honey - presumably then this is pasteurization.
 
Degrees F.          Time in Minutes
125           470
130           170
135           60
140           22
145           7.5
150           2.8
155           1.0
 
Draw your own conclusions
 
 
Kenn Tuckey
Provincial Apiculturist,  Alberta Agriculture, Food and Rural  Development
17507 - Fort Road, R.R. #6,  Edmonton, AB T5B 4K3
Phone 403-415-2314   Fax: 403-422-6096
Mailto:[log in to unmask]