chapter  59
14 Pages

Silica in Biology

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 765

Silica Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767

How Silica Grows . . . . . . . . . . . . . . . . . . . . . . . . . . 767

The Silica Surface-Water Interface . . . . . . . . . . . . 768

Silica-Metal Ion Interactions . . . . . . . . . . . . . . . . . 769

Silica Complexation with Polyols . . . . . . . . . . . . . . 770

Diatoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 771

The Growth of Silica Within Diatoms . . . . . . . . . . 771

Silica Influence on Crystalization . . . . . . . . . . . . . . 772

Adsorption on Bacterial Surfaces . . . . . . . . . . . . . . 772

Microbial Influence on Silicate Weathering . . . . . . 772

Silica Toxicology . . . . . . . . . . . . . . . . . . . . . . . . . . . 772

Bioactive Silica Containing Materials . . . . . . . . 773

Materials Applications . . . . . . . . . . . . . . . . . . . . . . . 773

Organic Templating . . . . . . . . . . . . . . . . . . . . . . . . . 774

Bioencapsulation . . . . . . . . . . . . . . . . . . . . . . . . . . . 774

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 775

Derek Birchall would have enjoyed the renewed interest

in the colloidal chemistry of silica with emphasis on bio-

logical application. He was looking forward to a future

meeting [1] like the one in memory of Ralph Iler at the

200th ACS Meeting in Washington, DC in 1990 where

researchers from around the world could share their views.