Tissue culture of forest trees—Clonal propagation of mature trees of Eucalyptus citriodora Hook,by tissue culture

Multiple shoots were obtained from terminal buds of 20-year-old trees of Eucalyptus citriodora Hook on Murashige and Skoog's medium supplemented with calcium pantothenate, biotin, benzylaminopurine and kinetin. Rooting could be induced by naphthalene-acetic acid in shoot cultures only after they had undergone three subcultures. Incubation at 15°C with continuous illumination followed by growth in agitated liquid cultures was essential for inducing shoot development in the primary terminal buds. These treatments were not necessary in later subcultures or with explants from seedlings obtained from seeds. Fifteen subcultures have so far been carried out and healthy viable plantlets obtained in each subculture. It is estimated that over 100 000 plants can be obtained by this method in a year from a single bud of mature Eucalyptus citriodora trees.     

Nanotechnology Nexus—Intersection of Research,Science, Technology,and Regulation

Not a day passes where nanotechnology does not make headlines in the popular press, scientific journals, as well as in the regulatory arena. Environmental and public health activists are voicing a growing concern and focus on the risks potentially posed by nanotechnology and the ability of the government to regulate these new and exciting technologies. Whereas such concerns state the need for stringent, precautionary, and almost exclusionary approaches to the regulation of nanotechnology, many entities believe that a voluntary approach to these often novel materials and technologies is the appropriate and sensible path. In this editorial, we discuss the importance of nanotechnology, who cares, and the available options for approaching the regulation of this often novel technology. We focus on the U.S. Environmental Protection Agency (USEPA) and its voluntary regulatory data submission program as the preferred alternative. ^{2 2}Comments are those of the authors and do not necessarily represent those of their employers. View all notes     

Jute — world’s foremost bast fibre,II. Technology,marketing, production and utilization

Jute fibre is the world’s principal material in manufacturin? coarse textile for conversion into sackin? and canvas. It enters also into the production of upholstery, ru?s, carpets and roofin? fabrics. Secondary products are food from its tender shoots, medicines from its dried leaves, fuel and paper from its stems, and oil from its seeds.