CONTENTS
MATHEMATICS
The effect of anharmonic terms on the resonance of an oscillating system
Gad, Nabila A.; Abd El-Hady, Mona K.; El-Sheikh, Soheir S.
1
On a singular differential operator of the second order
A. A. Darwish, M.S. Selem, E.E. Abd El-Aal
19
Two semiclassifying theorems for metabelian groups
H. M. Hawidi, V. V. Sergeichuk
31
Isochronal surfaces for certaifr control system
M. Z. Ragab
44
Distribution of velocities in an oscillating gas bubble
N.M.H. Abdel Aziz-eHEMISTRY
60
Chemistry
H - NMR study of 3-mono - 3,4 - & 3,6 - substituted naphtho - (2,1 -b)- pyran -2- one derivatives
A. A. El-Khouly ; A.H. Bedair ; F.M. Aly and A.M. El-Agrody
69
H_ study of some substituted oxonaphtho - 1,3 - oxazocine derivatives
A. A. EI-Khouly j F.M. Aly j A.H. Bedair and A.M. EI-Agrody<
81
Some chemical aspects of 3-amino-l,2,4-triazole
M. El-Borai, A.A. El-Barbary, M. Fahmy and H.H. El-Naggar
93
Some reactions of 4-amino(hydrazino)-3-mercapto-5-aryl-1,2,4-triazole
A.A. El-Barbary, H.H. El-Naggar
102
Geology
Natural gamma ray spectral logging data as environment indicators
Nader H. El-Gendy
112
Foot by foot evolution in some chalky limestone Formations
136
Qualitative well log interpretation of some early cretaceous formations in sidi abdel rahman area
Nadar H. El-Gendy and Azz El-Din Saleh
161
Botany
Role of nicotinamide and salicylaldehyde on some growth parameters in wheat
Y. A. H. Mohamed, A. Sharaf El-Din and E. Foda
191
Influence of 2,4-D*-and CCC*-treatment on the pigment contents and photosynthetic activity of Hordeum vulgare and Sorghum bicolor
Hohamed El-Anwar H. Osman, El-Sayed A.M. Hamada, Awatef A. Mohsen and Hameda A. El-Sayed
242
Formation of auxins, gibberellins and vitamins by rhizosphere fungi and their effect on the growth of barley
Mostafa A. El-Sayed, Abd El-Raheem R. El-Shanshoury and Hanaa S. Fahmy
261
Levels of nucleic acids and some related enzymes in seedling of Beta vulgaris as influenced by some plant growth regulators
Y.A.H. Mohamed, B.A. Abdel-Ghaffar and M.A.H. El-Beheiry
276
Qualitative study on seed proteins of Thymelaea hirsuta L. populations
R. H. Sammour and A. Sharaf El-Din
290
Effectiveness of some insecticides against laboratory and field strains of the egyptian cotton leafworm Spodoptera littoralis (boisd.) during 1985 season of cotton cultivation
S.A. Abdallah and I.M. El-Nabarawy
313
ZOOLOGY
Some ecological observations on crustacean amphipods associated with marine fouling in Suez canal (Egypt)
M. H. Mona, F.M. Abou-Senna, F.A. Shoukr, and S. Ramadan
332
Effect of some insecticides on biomphalaria alexandrina the intermediate host of schistosoma mansoni in Egypt I. Toxicity and biological studies
El-Sheikh,H.; Hamid, M.E.; Mohamed, A.M. and Mongy, S.
356
Further contribution on the pancreas of the cichld fish, tilapia nilotica
Fouad A. Abou-Zaid and Siham B.Salem
380