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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.