@article{Awasthi_2004 author = {Mamta Awasthi and Debanghshu Narayan Das}, title = {Heavy metal toxicity on nitrate reductase activity of free and immobilized algal cells}, journal = {International Journal on Algae}, issn = {1521-9429}, year = {2004}, volume = {6}, number = {2}, pages = {151--157} }