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Volume 43, No. 4, December  2006
Contents

Research Articles

Life Sciences

Taxonomic study of the class Ulvophyceae (Chlorophyta) from certain areas of the Punjab, Pakistan
A. Zarina, Masud-ul-Hasan and Mustafa Shameel
 







229

Enzyme activities in relation to sugar accumulation in tomato
M. J. Alam, M. Habibur Rahman, M. A. Mamun, I. Ahmad and K. Islam

 241
NOx removal from air by Nitrosomonas europaea
G. M. R. Islam and M. J. B. Alam

 249
Effect of temperature, pH and metal ions on the activity and stability of alkaline protease from novel Bacillus Licheniformis MZK03
S. M. Abu Sayem, M. J. Alam and Md. Mozammel Hoq
 257
Physical Sciences

Thermal effects on Rayleigh waves in a rotating transversely isotropic material
A. Rehman, A. Khan and A. Ali

263
On generalizations of Hadamard products of functions with negative coefficients
H. E. Darwish
 		 269
Effect of improving both the auxiliary and variable of interest in ratio and product estimators
A.A. Adewara
 		 275
A dual to variance ratio-type estimator in simple random sampling
Javid Shabbir
 		 279
Engineering Sciences & Technology

Classifying a child as labourer: A scientific study for child labor clustering and discrimination
Ahmed F. Siddiqi and Muhammad Khalid Pervaiz

285
Reviews

Life Sciences

Bioinformatics resource development in Pakistan: A review
Sajid Rashid
 



295

 
Instructions to Authors
 		 309