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Vol. 117 No. 4 October-December 1988 National Science and Technology authority Dr. Antonio Arizabal Secretary The Philippine Journal of Science Advisory Board Dr. Leland S. Villadolid Dr. Quintin L. Kintanar Dr. Rafael D. Querrero III Dr. Ricardo M. Lantican Engr. Benjamin T. Damian Dr. Rogelio A. Panlasigue Exucitive Editor Dr. Perfecto K. Guerrero Contributing Editors Engr. Benjamin T. Damian Dr. Roman L. Kintanar Dr. Rufino C. Lirag Dr. Rodolfo F. Florentino Dr. Constante V. Ventura Dr. Raymundo S. Punongbayan Dr. Quirino O. Nvarro Dr. Irene D. Amores Dr. Florentino O. Tesoro Dr. Eduardo P. Villanueva Dr. Paulo C. Campos Editorial Staff Publications Director : Dr. Irene D. Amores Publications Co-Director : Prof. Manuel P. Garcia, Jr. Publication Supervisor : Mr. Redocindo L. Santillan Associate Director : Ms. Victoria B. Bartilet : Ms. Cymbeline R. Villamin Managing Editor : Ms. Charity M. Bolos Circulation Assistants : Ms. Mona Carina E. Montevirgen : Mr. Elizalde D. Aguirre Publication Assistant : Mr. Salvador B. Belen Financial Assistants : Ms. Lourdes V. Biescas

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Vol. 117 No. 4 October-December 1988

National Science and Technology authority

Dr. Antonio ArizabalSecretary

The Philippine Journal of Science

Advisory Board

Dr. Leland S. VilladolidDr. Quintin L. KintanarDr. Rafael D. Querrero III

Dr. Ricardo M. LanticanEngr. Benjamin T. DamianDr. Rogelio A. Panlasigue

Exucitive EditorDr. Perfecto K. Guerrero

Contributing Editors

Engr. Benjamin T. DamianDr. Roman L. KintanarDr. Rufino C. LiragDr. Rodolfo F. FlorentinoDr. Constante V. VenturaDr. Raymundo S. Punongbayan

Dr. Quirino O. NvarroDr. Irene D. AmoresDr. Florentino O. TesoroDr. Eduardo P. VillanuevaDr. Paulo C. Campos

Editorial Staff

Publications Director : Dr. Irene D. AmoresPublications Co-Director : Prof. Manuel P. Garcia, Jr.Publication Supervisor : Mr. Redocindo L. SantillanAssociate Director : Ms. Victoria B. Bartilet

: Ms. Cymbeline R. VillaminManaging Editor : Ms. Charity M. BolosCirculation Assistants : Ms. Mona Carina E. Montevirgen

: Mr. Elizalde D. AguirrePublication Assistant : Mr. Salvador B. BelenFinancial Assistants : Ms. Lourdes V. Biescas

: Mr. Abilio P. Gillego

Vol. 117 No. 3 July-September 1988

National Science and Technology authority

Dr. Antonio ArizabalSecretary

The Philippine Journal of Science

Advisory Board

Dr. Leland S. VilladolidDr. Quintin L. KintanarDr. Rafael D. Querrero III

Dr. Ricardo M. LanticanEngr. Benjamin T. DamianDr. Rogelio A. Panlasigue

Exucitive EditorDr. Perfecto K. Guerrero

Contributing Editors

Engr. Benjamin T. DamianDr. Roman L. KintanarDr. Rufino C. LiragDr. Rodolfo F. FlorentinoDr. Constante V. VenturaDr. Raymundo S. Punongbayan

Dr. Quirino O. NvarroDr. Irene D. AmoresDr. Florentino O. TesoroDr. Eduardo P. VillanuevaDr. Paulo C. Campos

Editorial Staff

Publications Director : Dr. Irene D. AmoresPublications Co-Director : Prof. Manuel P. Garcia, Jr.Publication Supervisor : Mr. Redocindo L. SantillanAssociate Director : Ms. Victoria B. Bartilet

: Ms. Cymbeline R. VillaminManaging Editor : Ms. Charity M. BolosCirculation Assistants : Ms. Mona Carina E. Montevirgen

: Mr. Elizalde D. AguirrePublication Assistant : Mr. Salvador B. BelenFinancial Assistants : Ms. Lourdes V. Biescas

: Mr. Abilio P. Gillego

Vol. 117 No. 2 April-June 1988

National Science and Technology authority

Dr. Antonio ArizabalSecretary

The Philippine Journal of Science

Advisory Board

Dr. Leland S. VilladolidDr. Quintin L. KintanarDr. Rafael D. Querrero III

Dr. Ricardo M. LanticanEngr. Benjamin T. DamianDr. Rogelio A. Panlasigue

Exucitive EditorDr. Perfecto K. Guerrero

Contributing Editors

Engr. Benjamin T. DamianDr. Roman L. KintanarDr. Rufino C. LiragDr. Rodolfo F. FlorentinoDr. Constante V. VenturaDr. Raymundo S. Punongbayan

Dr. Quirino O. NvarroDr. Irene D. AmoresDr. Florentino O. TesoroDr. Eduardo P. VillanuevaDr. Paulo C. Campos

Editorial Staff

Publications Director : Dr. Irene D. AmoresPublications Co-Director : Prof. Manuel P. Garcia, Jr.Publication Supervisor : Mr. Redocindo L. SantillanAssociate Director : Ms. Victoria B. Bartilet

: Ms. Cymbeline R. VillaminManaging Editor : Ms. Charity M. BolosCirculation Assistants : Ms. Mona Carina E. Montevirgen

: Mr. Elizalde D. AguirrePublication Assistant : Mr. Salvador B. BelenFinancial Assistants : Ms. Lourdes V. Biescas

: Mr. Abilio P. Gillego

Vol. 117 No. 1 Jan-March 1988

National Science and Technology authority

Dr. Antonio ArizabalSecretary

The Philippine Journal of Science

Advisory Board

Dr. Leland S. VilladolidDr. Quintin L. KintanarDr. Rafael D. Querrero III

Dr. Ricardo M. LanticanEngr. Benjamin T. DamianDr. Rogelio A. Panlasigue

Exucitive EditorDr. Perfecto K. Guerrero

Contributing Editors

Engr. Benjamin T. DamianDr. Roman L. KintanarDr. Rufino C. LiragDr. Rodolfo F. FlorentinoDr. Constante V. VenturaDr. Raymundo S. Punongbayan

Dr. Quirino O. NvarroDr. Irene D. AmoresDr. Florentino O. TesoroDr. Eduardo P. VillanuevaDr. Paulo C. Campos

Editorial Staff

Publications Director : Dr. Irene D. AmoresPublications Co-Director : Prof. Manuel P. Garcia, Jr.Publication Supervisor : Mr. Redocindo L. SantillanAssociate Director : Ms. Victoria B. Bartilet

: Ms. Cymbeline R. VillaminManaging Editor : Ms. Charity M. BolosCirculation Assistants : Ms. Mona Carina E. Montevirgen

: Mr. Elizalde D. AguirrePublication Assistant : Mr. Salvador B. BelenFinancial Assistants : Ms. Lourdes V. Biescas

: Mr. Abilio P. Gillego

Vol. 116 No. 4 October-December 1987

National Science and Technology authority

Antonio Arizabal, Secretary

The Philippine Journal of SciencePublished by the Industrial Technology Development Institute

(formerly National Institute of Science and Technology)and the Department of Science and Technology

(formerly National Science and Technology Authority)

Advisory Board

Emil Q. Javier Ph. D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Miguel M. Varela, S.J., Ph.D.

Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.Rufino C. Lirag, Jr., Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pharm.

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 116 No. 3 July-September 1987

National Science and Technology authority

Antonio Arizabal, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of SciencePublished by the Industrial Technology Development Institute

(formerly National Institute of Science and Technology)and the Department of Science and Technology

(formerly National Science and Technology Authority)

Advisory Board

Emil Q. Javier Ph. D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Miguel M. Varela, S.J., Ph.D.

Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.Rufino C. Lirag, Jr., Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pharm.

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 116 No. 2 April-June 1987

National Science and Technology authority

Antonio Arizabal, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of SciencePublished by the Industrial Technology Development Institute

(formerly National Institute of Science and Technology)and the Department of Science and Technology

(formerly National Science and Technology Authority)

MemberEmil Q. Javier Ph. D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Miguel M. Varela, S.J., Ph.D.

Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.Rufino C. Lirag, Jr., Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pharm.

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 116 No. 1 January-March 1987

National Science and Technology authority

Antonio Arizabal, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Antonio Arizabal, M.D., Ph.D.Chairman

Emil Q. Javier Ph. D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Miguel M. Varela, S.J., Ph.D.

Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.Rufino C. Lirag, Jr., Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pharm.

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 115 No. 4 October-December 1986

National Science and Technology authority

Antonio Arizabal, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Antonio Arizabal, M.D., Ph.D.Chairman

Emil Q. Javier Ph. D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.Roman L. Kintanar, Ph.D.

Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D.

[Entered at the post office at Manila, Philippines, as second-class matter.

Vol. 115 No. 3 July-September 1986National Science and Technology authority

Antonio Arizabal, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Chairman

Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Filemon A. Uriarte, Jr., Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D

.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 115 No. 2 April-June 1986

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Chairman

Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Filemon A. Uriarte, Jr., Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 115 No. 1 January-March 1986

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Chairman

Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Filemon A. Uriarte, Jr., Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 114 No. 3-4 July-December 1985

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Chairman

Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Filemon A. Uriarte, Jr., Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 114 No. 1-2 Jan-June 1985

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Chairman

Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.Filemon A. Uriarte, Jr., Ph.D.

Miguel M. Varela, S.J., Ph.D.Jose R. Velasco, Ph.D.Gregorio T. Velasquez, Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

ConsultantIleana. F. Cruz, A.M.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing EditorJasmin G. Deverala, B.S. Pha

Publication Assistant Circulation AssistantAngelito C. De Guzman, B.S.C. Josephine B. King, B.S.C.

Contributing Editors

Manuel R. Euginio, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

Roman L. Kintanar, Ph.D.Manaloto G. Natera, Ph.D.Raymundo S. Punongbayan, Ph.D.Florentino O. Tesoro, Ph.D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 113 No. 3-4 July-December 1984

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.

Gregorio T. Velasquez, Ph.D.Fr. Miguel M. Valera, S.J. Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing Editor Circulation AssistantJasmin G. Deverala, B.S. Pha Josephine B. King, B.S.C.

Editorial ConsultantIleana R.F. Cruz, A.M.

Contributing Editors

Filemon A. Uriarte, Jr., Ph.D.Florentino O. Tesoro, Ph.D.Manolito G. Natera, Ph.D.

Raymundo S. Punongbayan, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 113 No. 1-2 Jan-June 1984

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.

Gregorio T. Velasquez, Ph.D.Fr. Miguel M. Valera, S.J. Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing Editor Circulation AssistantJasmin G. Deverala, B.S. Pha Josephine B. King, B.S.C.

Editorial ConsultantIleana R.F. Cruz, A.M.

Contributing Editors

Filemon A. Uriarte, Jr., Ph.D.Florentino O. Tesoro, Ph.D.Manolito G. Natera, Ph.D.

Raymundo S. Punongbayan, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 112 No. 3-4 July-December 1983

National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.

Gregorio T. Velasquez, Ph.D.Fr. Miguel M. Valera, S.J. Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pharm.

Managing Editor Circulation AssistantJasmin G. Deverala, B.S. Pha Josephine B. King, B.S.C.

Editorial ConsultantIleana R.F. Cruz, A.M.

Contributing Editors

Filemon A. Uriarte, Jr. Ph.D.Florentino O. Tesoro, Ph.D.Manolito G. Natera, Ph.D.

Raymundo S. Punongbayan, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 112 No. 1-2 Jan-June 1983National Science and Technology authority

Dr. Emil Q. Javier, Director GeneralQuintin L. Kintanar, Deputy Director General

The Philippine Journal of ScienceNSDB-NIST Project No. 7308-OT, founded by the national Science

Development Board, and Published quarterly by the Philippine Journal of Science P.O. Box 774, Manila, Philippines

Advisory Board

Emil Q. Javier Ph.D.Roger R. Posadas, Ph.D.Alfredo C. Santos, Ph.D.

Gregorio T. Velasquez, Ph.D.Fr. Miguel M. Valera, S.J. Ph.D.

EditorQuintin L. Kintanar, M.D., Ph.D.

Associate Editors

Irma R. Castro, M.S. Bot. Minda Flor T. Brandares, B.S.Pha.

Managing Editor Circulation AssistantJasmin G. Deverala, B.S. Pha Josephine B. King, B.S.C.

Editorial ConsultantIleana R.F. Cruz, A.M.

Contributing Editors

Lydia M. Joson Dok. Agrik.Florentino O. Tesoro, Ph.D.Manolito G. Natera, Ph.D.

Raymundo S. Punongbayan, Ph.D.Rodolfo F. Florentino, Ph.D.Jose L. Guerrero Ph. D.

\

[Entered at the post office at Manila, Philippines, as second-class matter.]

Vol. 111 No. 1-2 Jan-June 1982

National Science Development BoardBoard of Governors

Dr. Emil Q. Javier,Chairman

MembersOnofre D. Corpus, Edgardo Angara

Roberto V. Ongpin, Geronimo Z. Velasco, Placido Mapa Jr.

Agencies of the Board

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Forest Products Research and Industries Development CommissionRodrigo ValbuenaCommissioner

Philippine Inventors CommisionFidelino AdrianoOfficer-in-charge

Food Nutrition Research Center InstituteJosefina Bulatao-JaymeOfficer-in-charge

Philippine Textile Research InstituteEduardo P. VillanuevaDirector

Commission on VolcanologyOlimpio PeñaActing Commissioner

The Philippine Journal of Science

NSDB-NIST Project No. 7308-OT, founded by the national ScienceDevelopment Board, and Published quarterly by the Philippine Journal of Science

P.O. Box 774, Manila, Philippines[Entered at the post office at Manila, Philippines, as second-class matter.]

Vedasto R. JoseEditor

Jose R. Velasco Ph.D.Consultant

Jasmin G. DeveralaPublication & Circulation

Josephine B. KingJournal Secretary

Vol. 110 No. 3-4 July-December 1981

National Science Development BoardBoard of Governors

Dr. Emil Q. Javier,Chairman

MembersOnofre D. Corpus, Edgardo Angara

Roberto V. Ongpin, Geronimo Z. Velasco, Placido Mapa Jr.

Agencies of the Board

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Forest Products Research and Industries Development CommissionRodrigo ValbuenaCommissioner

Philippine Inventors CommisionFidelino AdrianoOfficer-in-charge

Food Nutrition Research Center InstituteJosefina Bulatao-JaymeOfficer-in-charge

Philippine Textile Research InstituteEduardo P. VillanuevaDirector

Commission on VolcanologyOlimpio PeñaActing Commissioner

The Philippine Journal of Science

NSDB-NIST Project No. 7308-OT, founded by the national ScienceDevelopment Board, and Published quarterly by the Philippine Journal of Science

P.O. Box 774, Manila, Philippines[Entered at the post office at Manila, Philippines, as second-class matter.]

Vedasto R. JoseEditor

Jasmin G. Deverala Josephine B. KingManaging Editor Circulation Assistant

Associate EditorsIrma R. Castro

Mindaflor T. Brandares

ConsultantJoser R. Velasco, Ph.D.

Vol. 110 No. 1-2 Jan-June 1981

National Science Development BoardBoard of Governors

Dr. Emil Q. Javier,Chairman

MembersOnofre D. Corpus, Edgardo Angara

Roberto V. Ongpin, Geronimo Z. Velasco, Placido Mapa Jr.

Agencies of the Board

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Forest Products Research and Industries Development CommissionRodrigo ValbuenaCommissioner

Philippine Inventors CommisionFidelino AdrianoOfficer-in-charge

Food Nutrition Research Center InstituteJosefina Bulatao-JaymeOfficer-in-charge

Philippine Textile Research InstituteEduardo P. VIllanuevaDirector

Commission on VolcanologyOlimpio PenaActing Commissioner

The Philippine Journal of Science

NSDB-NIST Project No. 7308-OT, founded by the national ScienceDevelopment Board, and Published quarterly by the Philippine Journal of Science

P.O. Box 774, Manila, Philippines[Entered at the post office at Manila, Philippines, as second-class matter.]

Leonila B. FloresEditor

Emilia A. Salanga Jasmin G. DeveralaScience Reseach Specialist II Science Reseach Specialist I

Josephine B. KingScience Research Assistant I

Jose R. Velasco, Ph.D.Consultant

Vol. 109 No. 3-4 July-December 1980

National Science Development BoardBoard of Governors

Dr. Emil Q. Javier,Chairman

MembersOnofre D. Corpus, Edgardo Angara

Roberto V. Ongpin, Geronimo Z. Velasco, Placido Mapa Jr.

Agencies of the Board

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Forest Products Research and Industries Development CommissionRodrigo ValbuenaCommissioner

Philippine Inventors CommisionFidelino AdrianoOfficer-in-charge

Food Nutrition Research Center InstituteJosefina Bulatao-JaymeOfficer-in-charge

Philippine Textile Research InstituteEduardo P. VIllanuevaDirector

Commission on VolcanologyOlimpio PenaActing Commissioner

The Philippine Journal of Science

NSDB-NIST Project No. 7308-OT, founded by the national ScienceDevelopment Board, and Published quarterly by the Philippine Journal of Science

P.O. Box 774, Manila, Philippines[Entered at the post office at Manila, Philippines, as second-class matter.]

Vedasto R. JoseEditor

Jasmin G. Deverala Josephine B. KingManaging Editor Circulation Assistant

Associate EditorsIrma R. Castro

Mindaflor T. Brandares

ConsultantJoser R. Velasco, Ph.D.

Vol. 109 No. 1-2 Jan-June 1980

National Science Development BoardBoard of Governors

Melecio S. Magno,Chairman

MembersSegundo V. Roxas, Gerardo P. Sicat, Onofre D. Corpus

Roberto V. Ongpin, Geronimo Z. Velasco, Emmanuel V. Soriano

Agencies of the Board

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Forest Products Research and Industries Development CommissionRodrigo ValbuenaCommissioner

Philippine Inventors CommisionFidelino AdrianoOfficer-in-charge

Food Nutrition Research Center InstituteJosefina Bulatao-JaymeOfficer-in-charge

Philippine Textile Research InstituteEduardo P. VIllanuevaDirector

Commission on VolcanologyOlimpio PenaActing Commissioner

The Philippine Journal of Science

Published quarterly by the National Science Development Board P.O. Box 774, Manila, Philippines

[Entered at the post office at Manila, Philippines, as second-class matter.]

EditorLeonila B. Flores

Assistant EditorEmilia A. Salanga

Publication/Circulation Assistant SecretaryJasmin G. Deverala Josephine Belvis-king.

Vol. 108 No. 3-4 September-December 1979

National Science Development BoardBoard of Governors

Melecio S. Magno,Chairman

MembersSegundo V. Roxas, Gerardo P. Sicat, Onofre D. Corpus

Roberto V. Ongpin, Geronimo Z. Velasco, Emmanuel V. Soriano

Agencies of the Board

Commision on VolcanologyGregorio C. Andal, M.S.Commisioner

Food Nutrition Research CenterCarmen Ll. Intengan, Ph.D.Director

Forest Products Research and Industries Development CommissionFrancisco Tamolang, Ph.D.Commissioner

National Pollution Control CommisionGuillermo A. PecacheCommisioner

Philippine Textile Research InstituteFelipe Ll. Santillan, B.S.M.E.Commisioner

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Philippine Textile Research InstituteRicardo C. Cruz, M.S.Director

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

[Entered at the post office at Manila, Philippines, as second-class matter.]

Acting EditorIleana R,F, Cruz, A.M.Publication AssistantJasmin G. Deverala

Contributing Editor

Josefina Cortes, Ph.D.Carmen Ll. Intengan, Ph.D.Josefina B. Jayme, M.D., M.P.NIbarra Santos, Ph.D.

Vol. 107 No. 1-2 March-June 1979

National Science Development BoardBoard of Governors

Melecio S. Magno,Chairman

MembersSegundo V. Roxas, Gerardo P. Sicat, Onofre D. Corpus

Roberto V. Ongpin, Geronimo Z. Velasco, Emmanuel V. Soriano

Agencies of the Board

Commision on VolcanologyGregorio C. Andal, M.S.Commisioner

Food Nutrition Research CenterCarmen Ll. Intengan, Ph.D.Director

Forest Products Research and Industries Development CommissionFrancisco Tamolang, Ph.D.Commissioner

National Pollution Control CommisionGuillermo A. PecacheCommisioner

Philippine Textile Research InstituteFelipe Ll. Santillan, B.S.M.E.Commisioner

National Institute of Science and TechnologyVedasto R. JoseCommisioner

Philippine Textile Research InstituteRicardo C. Cruz, M.S.Director

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

[Entered at the post office at Manila, Philippines, as second-class matter.]

Acting EditorIleana R,F, Cruz, A.M

.

Contributing Editor

Josefina Cortes, Ph.D.Carmen Ll. Intengan, Ph.D.Josefina B. Jayme, M.D., M.P.NIbarra Santos, Ph.D.