Since the early Jvork of Carrel ( '21) and his collaborators, who demonstrated the growth-promoting activity of chicken emloryo extract, attempts have been made to further isolate and characterize the components responsible f o r this growth stimulation (Fischer, '46). Later, Claude ( '38) isolated
Extraction of petroleum fractions by ammonia solvents
β Scribed by M. R. Fenske; R. H. McCormick; H. Lawroski; R. G. Geier
- Publisher
- American Institute of Chemical Engineers
- Year
- 1955
- Tongue
- English
- Weight
- 759 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0001-1541
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The antifertility activity of column chromatographically isolated fractions (petroleum ether:benzene 1:1 v/v and chloroform:methanol 1:1 v/v) of a petroleum ether extract of Mentha arvensis leaf were evaluated in the male albino mouse. Administration of the fractions for 20 days at a dose of 1.0 mg/
## Abstract Two protected trinucleotide blocks MMTrβT~p~T~p~T and dβMMTrβA^Bz^~p~T~p~G^iβBu^ were synthesized using phosphodiester approach. The purification of these blocks was achieved in satisfactory yields simply by extraction into a binary organic solvent.