پاکستان میں رائج زرعی نظام کا شرعی جائزہ

Islam has provided guidance in agriculture like any other field of life. Agriculture provides food and nourishment to men, animals and birds. Pakistan is an agricultural land. Out of total grass root of Pakistan economy, 80% depends upon the agriculture. Agriculture is the production of food, feed and fiber by the systematic harvesting of plants and animals. The history of agriculture is a central element of human history. The article deals with the study of Muslims’ contribution to agriculture especially the Prophetic and four caliphs’ time. The Prophet r initiated the development of a sophisticated system of irrigation, and the Caliphs Hazrat Umar R. A and Hazrat Uthman R. A suggested revolution in agricultural reforms. The Islamic rules on land ownership and labor rights, alongside the recognition of private ownership and introduction of share cropping created by incentives to engage in agriculture. The present system prevailing in Pakistan has several short comings. Landlordism and poverty of cultivators who are generally uneducated, absence of heavy machinery for cultivation and small holdings also create problem.

Study of Polymeric Hydrogels As Novel Biotechnological Materials

A novel method was developed to synthesize switchable pH responsive hydrogel from natural and synthetic polymers. Blends of CM-chitosan and carrageenan were reacted with acrylic acid and in situ crosslinked with vinyltriethoxy silane (VTESi). This crosslinker is used for the first time for this type of blends. Three sets of polymeric hydrogels were prepared in this work. Polymerization steps involve initiation, propagation, copolymerization and crosslinking reactions. During the process of polymerization, peroxide was broken into radicals, which attack other molecules and monomers present in the reactor to convert them into radicals. These resultant radicals combine with each other to produce stable molecules which upon crosslinking through a process of condensation lead to the formation of network structure having hydrogels properties. These hydrogels are then characterized by using various techniques. Structural and thermal analysis confirmed the presence of crosslinking within hydrogel. Dynamics of water vapor sorption was also done to show the extent and rate of vapor uptake of prepared hydrogels. Similarly swelling study in water gave a clear picture about the effect of concentration of monomer and crosslinking agent on swelling ability of hydrogel. Swellings in buffered, non-buffered and ionic environment exhibited a variety of behavior. Temperature was found to be favorable for swelling but only to a specific extent. All the developed hydrogels showed switchable response against change in pH of the external media. These hydrogel showed low swelling at low and high pH and maximum swelling was observed at neutral pH. This pH response and biocompatible nature of the incorporated component made it a good candidate for drug delivery application. These hydrogels were loaded with insulin and its in-vitro release study showed very interesting results. A very low release of insulin was observed at low pH and consistent release was observed at neutral pH. Further studies on these systems will provide another biotechnological material for gastrointestinal delivery for drugs.