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MASS AND ENERGY BALANCE IN A GREENHOUSE

Juwawa Chayangira Department of Physics, Geography and Environmental Science Great Zimbabwe University P.O Box 1235 Masvingo, Zimbabwe

Abstract:-

The main driving force in a greenhouse is ventilation in terms of both the energy and mass constituents. To have a favourable climatic condition both energy and mass balance should be monitored. This study aims to implore this energy and mass balance affect the microclimatic condition in a greenhouse. It was found out the energy balance plays a critical role in plant growth through its effect on transpiration, while the mass balance was found to affect through carbon dioxide penetration and movement of water vapour which can also affect energy balance through the release of latent heat. The water vapour balance method was used to determine the transpiration rates. The energy balance was evaluated using the Penman Monteith method. The green house ventilation rate which plays the pivotal role in the energy and mass balance in a greenhouse was also evaluated.

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SYNTHESIS AND BIOLOGICAL EVALUATION OF SOME BIPYRAZOLE DERIVATIVES CONTAINING SULFONAMIDE,SULFONYLUREA AND THIOUREA PHARMACOPHORES AS ANTICANCER AND ANTIDIABETIC AGENTS

Hassan M. Faidallah*1,2, Danyah Y. Alghamdi1, Tariq R. Sobahi1 1Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia, 2Department of Chemistry, Faculty of Science, Alexandria University, Alexandria, Egypt

Abstract:-

The synthesis of a series of bipyrazoles substituted with benzenesulfonamide, N 1 ,N3 -disubstituted sulfonylurea, sulfonylthiourea pharmacophores, and some derived thiazolidinone and thiazoline ring were prepared as Anticancer and Antidiabetic agents. The key intermediate bipyrazoles were prepared by cyclocondensation of the appropriate chalcone with 4-hydrazinobenzenesulfonamide hydrochloride. The chemistry of the reactions employed in the synthesis of the target compounds together with their chemical behavior, are discussed. Preliminary biological screening of the prepared compounds revealed significant antidiabetic and antibacterial activities

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