Author: J. S. HanPublisher:
ISBN:
Category :
Languages : en
Pages : 108
Book Description
Potential Utilization of Extractives from Tropical Hardwoods
Author: J. S. HanTropical Hardwood Utilization: Practice and Prospects
Author: Roelof A.A. OldemanPublisher: Springer Science & Business Media
ISBN: 9401736103
Category : Technology & Engineering
Languages : en
Pages : 571
Book Description
Roelof A. A. Oldeman Tropical hardwoods are one of the essential cogs in the complex socio-economic machinery keeping alive an ever-increasing humanity with steadily rising claims upon a finite-resource environment. Their position in this context at first sight seems to be analogous to that of other commodities, such as rubber, metals, mineral oil, tropical fruits and many more. Looking closer, however, tropical hardwoods occupy a special place. Their vast majority, unlike tropical crops, still comes forth from natural forests being exploited by man. This exploitation straight from the natural resource is something they have in common with oil and metals, but the fact that they grow in living systems places them closer to crops. Natural forest ecosystems are not renewable. Timber producing trees, however, can be made into a renewable resource on condition that ways and means are found to cultivate them as a crop. be understood as a socio-economic The tropical hardwood situation can best chain, with the resource base at one end, the consumer community at the other and everything that has to do with the market in the middle. Now, at the resource side, the economics of tropical hardwood extraction barely got out of the primeval ways of wood-gathering by hand and by axe, which were still predominant in the nineteen-forties. There, the offer of natural products was so immense and so near to hand that no care had to be taken of the resource.
Potential Uses and Production of Wood Extractives from Malaysia Tropical Trees
Author: Azizol Abdul KadirPublisher:
ISBN:
Category : Rain forests
Languages : en
Pages :
Book Description
Wood extractives, also known as non-wood forest products are important silvichemical resources from the forest and have been facing an increasing demand. This paper presents the properties, uses, distribution and production of wood extractives from Aquilaria malaccensis, Dipterocarpus spp., Agathis borneensis, Cinnamomum spp. and Calophyllum spp. as potential sources of economic biochemicals. Collection of technical data and the optimum exploitation and supply of wood extractives as biochemical resources for various products are important for the establishment of non-wood forest products industries. [Author's abstract].
Extractives in Eastern Hardwoods
Author: John W. RowePublisher:
ISBN:
Category : Chemotaxonomy
Languages : en
Pages : 80
Book Description
Utilization of Residual Forest Biomass
Author: Pentti HakkilaPublisher: Springer Science & Business Media
ISBN: 3642740723
Category : Technology & Engineering
Languages : en
Pages : 582
Book Description
An increase in the demand for wood results in improved recovery and less residual biomass in the forests. Paradoxically, interest in forest residue as a renewable source of raw material seems to be in a reverse ratio to its availability in a certain area. Finland and Sweden are probably more dependent on forestry and forest in dustries than any other developed countries in the world. A sufficiency of raw ma terial for integrated forest industries is vital for the national economy of both countries, and a great deal of attention is being paid to the long-term potential of unutilized biomass left behind in logging operations. Furthermore, since these countries possess no reserves of fossil fuels, and since their per-capita consump tion of primary energy is exceptionally high, they also consider unmerchantable forest biomass a realistic source of indigenous energy. A joint Nordic research project on harvesting and utilization of logging residue was carried out in 1969-1976 under the auspices of the Nordic Research Council on Forest Operations. This fruitful cooperation soon gave rise to related national projects in Sweden, Finland, Norway, and Denmark, stimulating further research and producing practical applications. Concurrently, particularly after the worldwide energy crisis in 1973, research on all aspects of utilization of forest bio mass mushroomed in the United States, Canada, and the Soviet Union. An ex plosive increase occurred in both the number and diversity of biomass studies.
Papers for Conference on Improved Utilization of Tropical Forests, May 21-26, 1978, Madison, Wisconsin
Author: Extractives from Northeastern Woods
Author: Percy C. MagnusPublisher:
ISBN:
Category : Extracts
Languages : en
Pages : 62
Book Description
Forest Products from Latin America
Author: Robert R. MaeglinPublisher:
ISBN:
Category : Forest products
Languages : en
Pages : 124
Book Description
Wood Extractives and Their Significance to the Pulp and Paper Industries
Author: W. E. HillisPublisher: Academic Press
ISBN: 1483258610
Category : Science
Languages : en
Pages : 532
Book Description
Wood Extractives and their Significance to the Pulp and Paper Industries focuses on the promotion of the study of the biochemistry of wood extractives and to elaborate on the effects these materials may pose to the manufacture of pulp and paper. The publication first elaborates on wood, distribution and formation of polyphenols within the tree, and the simple polyphenolic constituents of plants. Discussions focus on the factors affecting the amounts of polyphenols present in living tissues, glycosidic combination, flavonols, anthocyanins, and leucoanthocyanins, formation of carbohydrates in the tree, types of polyphenols in different tissues of uninjured trees, and variation in structure and properties of wood. The text then examines lignans and condensed and hydrolyzable tannins. The manuscript takes a look at the alicyclic acid precursors of polyphenols, biosynthesis of polyphenols, and tropolones. Topics include tropolones occurring in wood, polymeric polyphenols, synthesis of pre-aromatic compounds, shikimic acid, and quinic acid. The book then ponders on the influence of extractives on the pulping of wood and the influence of extractives on the color of ground wood and newsprint. The publication is a valuable reference for researchers interested in the processes and methodologies involved in the manufacture of pulp and paper.
Extractive Industries and Ape Conservation
Author: Arcus FoundationPublisher: Cambridge University Press
ISBN: 1139917331
Category : Social Science
Languages : en
Pages : 379
Book Description
Current dominant thinking and practice in the private and public sectors asserts that peoples' development needs are in conflict with, or mutually exclusive to, the need to conserve the biosphere on which we depend. Consequently, we are asked to either diminish development in the name of conservation or diminish conservation in the name of development. Efforts to identify complementary objectives, or mutually acceptable trade-offs and compromises indicate, however, that this does not always have to be the case. This first volume in the State of the Apes series draws attention to the evolving context within which great ape and gibbon habitats are increasingly interfacing with extractive industries. Intended for a broad range of policy makers, industry experts, decision makers, academics, researchers and NGOs, these publications aim to influence debate, practice and policy, seeking to reconcile ape conservation and welfare, and economic and social development, through objective and rigorous analysis.