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SOURCES OF MATERIALS

Whatman no. 1 Catalogue number H-06648-17 Equipar, S.A. de C.V. Juan S�nchez Azcona No. 1447 Colonia del Valle, delegaci�n Benito Ju�rez Mexico, D.F. C.P. 03100

Methocel F4M Premium CMC and MC Droguer�a Cosmopolita S.A. de C.V. Av. Revoluci�n No. 1080 Col. Mixcoax Mexico City, Mexico

The chitosan was prepared from shrimp shells by the Chemical Laboratory of the Karl Augustin Grellman Institute of Wood, Cellulose, and Paper, University of Guadalajara. Autopista Guadalajara-Nogales, kil�metro 15.5 Las Agujas Municipio de Zapopan, Jalisco, Mexico Apartado Postal 52-93, C.P. 45020, Zapopan, Jalisco, Mexico

RK Print-Coat Instruments Ltd. Royston Herts 5G8 OQZ, U.K.

Brookfield Engineering Laboratories 240 Cushing St. Stoughton, Mass. 02072

AUTHOR INFORMATION

MARIA DEL PILAR PONCE-JIM�NEZ received her biology degree from the National Autonomic University of Mexico and her master's degree from the University of Guadalajara with a specialty in cellulose and paper. Since 1990, she has been professor of conservation and restoration of paper and graphic documents at the National School of Conservation and Restoration and Museography at the Manuel del Castillo Negrete Institute of the National Institute of Anthropology and History (INAH) in Veracruz, Mexico. She also develops methods of teaching, application, and investigation in the field of paper conservation. Address: Centro INAH Veracruz, Benito Ju�rez No. 425 y 431, Zona Centro, C.P. 91700, Veracruz, Veracruz, Mexico.

FERNANDO A. L�PEZ-DELLAMARY TORAL received his B.S. from the National Autonomic University of Mexico and his Ph.D. from the University of Wisconsin at Madison. He is a professor of chemistry and analytical chemistry at the University of Guadalajara; chief of the chemistry laboratory at the University of Guadalajara's Karl Augustin Grellman Institute of Wood, Cellulose, and Paper; and director of investigation projects on paper technology, biochemistry, and forestry engineering. Address: Departamento de Madera, Celulosa y Papel Karl Augustin Grellman, Apartado Postal 52–93, C.P. 45020, Zapopan, Jalisco, Mexico.

EZEQUIEL DELGADO FORNU� received his B.S. in chemical engineering from the University of Guadalajara, his master's degree from the Karl Augustin Grellman Institute of Wood, Cellulose, and Paper at the University of Guadalajara, and his Ph.D. from University of Washington, Seattle, Washington, specializing in polymer chemistry and fiber science. He is a professor and researcher at the Karl Augustin Grellman Institute, specializing in chemical modification of fibers and polymers—natural and synthetic— and bioactive compounds such as chitosan. Address: Departamento de Madera, Celulosa y Papel Karl Augustin Grellman, Apartado Postal 52–93, C.P. 45020, Zapopan, Jalisco, Mexico.