why is agar used as a solidifying agent in culture media
Agar Agar exhibits hysteresis, melting at 85 °C (358 K, 185 °F) and solidifying from 32–40 °C (305–313 K, 90–104 °F).[21] This property lends a suitable balance between easy melting and good gel stability at relatively high temperatures. Since many scientific applications require incubation at temperatures close to human body temperature (37 °C), agar is more appropriate than other solidifying agents that melt at this temperature, such as gelatin.
Agriculture The word agriculture is a late Middle English adaptation of Latin agricultūra, from ager, "field", and cultūra, "cultivation" or "growing".[3] Agriculture usually refers to human activities, although it is also observed in certain species of ant, termite and ambrosia beetle.[4] To practice agriculture means to use natural resources to "produce commodities which maintain life, including food, fiber, forest products, horticultural crops, and their related services."[5] This definition includes arable farming or agronomy, and horticulture, all terms for the growing of plants, animal husbandry and forestry.[5] A distinction is sometimes made between forestry and agriculture, based on the former's longer management rotations, extensive versus intensive management practices and development mainly by nature, rather than by man. Even then, it is acknowledged that there is a large amount of knowledge transfer and overlap between silviculture (the management of forests) and agriculture.[6] In traditional farming, the two are often combined even on small landholdings, leading to the term agroforestry.[7]