Possible Clues:

• Eponymous microbiologist Louis
• Regret over supporting former bacteriologist
• Old Frenchman's grazing cattle finally moving forward
• French chemist and biologist, d. 1895
• French scientist's gone over street there, heading North
• Famous bacteriologist
• Chemist no longer having hesitation about uranium
• Pioneering chemist super at broadcast
• French bacteriologist who pioneered stereochemistry
• Louis —, French bacteriologist