An International Review Journal
BIOTECHNOLOGY ADVANCES
Research Reviews and Patent Abstracts

Volume 22, Number 6, July 2004

Editorial

Environmental impact of toxic pollutants
        Yusuf Chisti...........................................................................................................431

SECTION A. Research Review Paper

Acoustic cell filter: a proven cell retention technology for perfusion of animal cell cultures
        Irfan Z. Shirgaonkar, Stephane Lanthier, Amine Kamen..................................................433

SECTION B. Classified Patent Abstracts

Biotech Animals-Pats......................................................................................................445

Enzymes and Enzyme Systems..........................................................................................447

Food, Feed and Beverages...............................................................................................453

Fuels, Chemicals and Metals from Bioprocesses....................................................................454

Genetic Engineering........................................................................................................456

Healthcare Products and Biomedicine.................................................................................464

Instrumentation, Assay and Equipment Design.....................................................................483

Mutation......................................................................................................................494

Plant Biotechnology........................................................................................................496

Biological Waste Treatment and Pollution Control.................................................................502