Tropical regions, secondary

Chlorophyta or green algae comprise one of the major groups of algae and include several exclusively marine orders and genera from tropical regions. Natural products chemistry research has identified more than 300 secondary metabolites from Chlorophyta, with most being sesquiterpenoid and diterpenoid compounds... 

Present studies in warm and temperate region. At present, we are assessing the allelopathic potential of weeds from a tropical region of the country (Uxpanapa, Veracruz), as a complement to the project entitled Recovery of Tropical Rain Forests from INIREB. This information is necessary to permit more efficient agricultural and forest management of the secondary vegetation in the tropics. 

Cloth made from the inner bark (secondary phloem) of various plants is found throughout many of the tropical regions of the world. Although the origins of its production are unknown, they have been chronicled as early as the 6th-century B.C. in China (5). The bark cloth of the Pacific, more commonly referred to by the Polynesian word "tapa", has been produced from the inner bark of various species of trees of the genera Broussonetia R. (paper-mulberry), Artocarous (breadfruit), and Ficus (fig species) (6). While examples of each of these types are well documented, the... 

Hughes, R. F., Kauffman, J. B., and Jaramillo, V. (1999). Biomass, carbon and nutrient dynamics of secondary forests in a humid tropical region of Mexico. Ecology SO, 1892- 1907,... 

Despite substantial advances in synthetic organic chemistry, many secondary metabolic compounds are either too difficult or too costly to synthesize. Some complex mixtures like rose oil cannot be constituted by manufacture. The majority of the plants that produce commercially useful substances are grown in tropical and subtropical regions of the world. As a result, the availability and costs of these materials depend on the political and economic circumstances of the countries of origin. 

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