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The present study on the structure and behaviour of vascular cambium and its derivative tissues- the food conducting (secondary phloem) and the water conducting (secondary xylem) pathways has been undertaken in relation to different weather conditions of the study site and age of the selected trees (Anthocephalus cadamba and Madhuca indica) for three consecutive years (2005, 2006 & 2007). The plant A. cadamba (Common bur-flower) belongs to family Rubiaceae is a large tree with a broad crown and straight cylindrical bole. It is found in moist, warm type of deciduous and evergreen forests. On...

Neem is the common name given to the different species of large, evergreen, glabrous shady trees, grown in semi-arid regions of the world. In Pakistan and India the common neem tree, also popularly known as Margosa is Azadirachata indica A. Juss. Neem products isolated from the neem tree were nimbinin, nimbin and nimbidin. Siddiqui (1942) was the first scientist to isolate and purify the neem constituents of its extract. In the present study, effects of Cypermethrin and two crude ethanolic neem extract RB-a and RB-b on the activity of enzymes (GOT, GPT, LDH and cholinesterase) against the...