FULL PAPERS

Analytical Chemistry

Automation of potentiometric titration with a personal computer using an IBM compatible interface system

Mulugeta Desta 

87

Abstract

Environmental Chemistry

Ambient air particulate matter in Lagos, Nigeria: A study using receptor modeling with X-ray flourescence analysis

E.A. Oluyemi and O.I. Asubiojo 

97

Abstract

Atmospheric pollution in North-East Nigeria: Measurement and analysis of suspended particulate matter

V.O. Ogugbuaja and L.Z. Barsisa 

109

Abstract

Coagulation of some humic acid solutions by Moringa oleifera Lam seeds: Effect on chlorine requirement

L.M. Bawa, G. Djaneye-Boundjou, Y. Boukari and A. Sani 

119

Abstract

Organic Chemistry

Two new isoflavanoids from Bolusanthus speciosus

Gomotsang Bojase, Cornelius C.W. Wanjala and Runner R.T. Majinda 

131

Abstract

2-Hydroxy-4-methoxybenzaldehyde: Aromatic taste modifying compound from Mondia whytei Skeels

Kavaka W. Mukonyi and Isaiah O. Ndiege 

137

Abstract

Solid-phase peptide synthesis of isotocin with amide of asparagine protected with 1-tetralinyl. Trifluoromethanesulphonic acid (TFMSA) deprotection, cleavage and air oxidation of mercapto groups to disulphide

Amir O. Yusuf, Bhalendu M. Bhatt and Peter M. Gitu 

143

Abstract

Constituents of Erythrina sigmoidea

Jean Claude Ndom, Kouam, Juliette Catherine Vardamides , Jean Duplex Wansi, Alain Waffo Kamdem, Joseph Tanyi Mbafor and Zacharias Tanee Fomum 

151

Abstract

Physical Chemistry

Proteins in vacuo. A more efficient means of calculating orientationally-averaged collision cross sections of protein ions

C.T. Reimann 

157

Abstract

SHORT COMMUNICATIONS

Hydrocarbon accumulation and discharge by the crayfish in some rivers of Lagos, Nigeria

O.S. Amuda, E.T. Ayodele, O.A. Owoade and A. Adetutu 

167

Abstract