Xem 1-20 trên 200 kết quả Forest biology
  • The rain forest takes an immense breath and then exhales, once every four or five years, as a major global weather pattern plays out, usually heralded by El Nin˜o–Southern Oscillation. While this powerful natural cycle has occurred for many millennia, it is during the past decade that both the climate of Earth and the people living on it have had an increasing influence on the weather pattern itself, with many biological consequences. In Southeast Asia, as also in most of the Neotropics, El Nin˜o accompanies one of the most exuberant outpourings of nature’s diversity.

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  • According to the scheme for forests, the services are divided into five main categories: resources; ecological; biospheric; social; and amenities2. The resources category refers to all goods that may be obtained from forests (wood and non-wood); the ecological services are those related to protection of water, soil and health; the biospheric services are mainly climate regulation and biodiversity protection; while social and amenity services comprise of different types of recreational activities and the cultural importance of forests.

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  • For the analysis of biological samples two blood samples were taken, one with 5 ml heparin for the determination of acetyl cholinesterase (AChE) and pseudo cholinesterase (PChE) by the technique of Michel and Aldrige (Vorhaus and Kark, 1953) and another of 5 ml without anticoagulant for the analysis of OC pesticides in serum.

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  • The science of forestry is a complex amalgamation of the biological, physical, managerial, social, and political sciences. Few, if any, forestry professionals are able to treat all aspects of forest science with complete authority. An edited book on forestry is thus the best method for conveying the science of forestry in one text.

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  • Further, Le Trong Trai et al. (2001) described that payments from these national forestry programs have provided benefits to villagers in the short term, and Acacia spp. and pine plantations established under these programs are growing reasonably well. However, villagers brought attention to a number of problems they had to face in response to the needs of the national forestry programs.

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  • The biological changes underlying the transition process from gingival health to early inflammatory changes involve local increase in vascular permeability, edema and the recruitment and activation of polymorphonuclear neutrophils (PMN) (Delima and Van Dyke 2003). Acquired immune response becomes involved once antigen-presenting cells interact with immunocompetent cells, such as T and B lymphocytes, leading to the expansion of antibody-secreting plasma cells and the development of the chronic lesion (Gemmell and Seymour 2004).

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  • A compilation of the most important aerosol chemical processes involved in known scientific and technological disciplines, Aerosol Chemical Processes in the Environment serves as a handbook for aerosol chemistry. Aerosol science is interdisciplinary, interfacing with many environmental, biological and technological research fields. Aerosols and aerosol research play an important role in both basic and applied scientific and technological fields. Interdisciplinary cooperation is useful and necessary.

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  • Whereas the mechanical performance of plant organs has often been discussed in evolutionary biology [1,2], tree biomechanics has rarely been considered in the context of functional ecology. Functional ecology aims at understanding the functions of organisms that result in fluxes of biomass or energy within an ecosystem, e.g., a forest. This discipline studies the processes controlling these fluxes, at either the scale of an individual, community, or ecosystem, with their response to natural or anthropic environmental variations....

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  • Integrating ecotoxicological concepts across a range of hierarchical levels, Ecotoxicology: A Comprehensive Treatmentfocuses on the paradigms and fundamental themes of ecotoxicology while providing the detail and practical application of concepts often found in more specialized books.

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  • Focusing on the rich biodiversity of Costa Rica, the contributors demonstrate the use of geographic information systems (GIS) to enhance conservation efforts. They give an overview of the spatial nature of conservation and management and the current status of digital mapping in Costa Rica; a review of the basic principles behind digital mapping technologies; a series of case studies using these technologies at a variety of scales and for a range of conservation and management activities; and the results of the Costa Rican gap analysis project....

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  • Creating institutions to meet the challenge of sustainability is arguably the most important task confronting society; it is also dauntingly complex. Ecological, economic, and social elements all play a role, but despite ongoing efforts, researchers have yet to succeed in integrating the various disciplines in a way that gives adequate representation to the insights of each.Panarchy, a term devised to describe evolving hierarchical systems with multiple interrelated elements, offers an important new framework for understanding and resolving this dilemma.

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  • Each section includes chapters with interesting topics. Authors spread around the world have been resolved so we are delighted that this book represents research in promising high. Material properties are described in more creative ways for the standard components or biological materials and sources of natural materials. Commonly used materials such as glass, carbon, epoxy resin, concrete, ... described the characteristics improve or construction work. Waste materials use and recycling is the next step and it is a important way how to save resources and our environment....

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  • Understanding the forces that influence natural variation within and among populations has been a major objective of evolutionary biology for decades (Csilléry et al., 2010). It can be problematic, as natural populations may have complex demographic histories: size and range changes over time can lead to bottlenecks, fusions and expansions that leave signatures on the genetic composition of the population (Avise, 2004). Detection and analysis of genetic diversity can help us to understand the molecular basis of various biological phenomena in these natural systems.

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  • By providing food, medicine, timber, a source of livelihood and many other products and services, forests play a crucial role in sustaining lives of billions of people. According to the Convention on Biological Diversity (CBD), in the past, timber production was regarded as the dominant function of forests.

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  • Traditional engineered solutions often work against nature, particularly when they aim to constrain regular ecological cycles, such as annual river flooding and coastal erosion, and could further threaten ecosystem services if creation of dams, sea walls, and flood canals leads to habitat loss.

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  • This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1980 edition. Excerpt: ...( Dodson and Gentry, 1978; Gentry, 1978). More than 50 new species of higher plants have been described during the past few years from the Rio Palenque station (1.7 km2), one of the few remaining areas of tropical moist forest in western Ecuador. The study of this forest should be pushed on as vigorously as possible.

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  • Swidden cultivation was a major activity for local livelihoods until 1992–1993, when most of the households were resettled as part of the government’s fixed cultivation program. Called ‘327 Program’ (1992–1997), it was the first effort of the GoV to develop industrial plantations and to decentralize control over and reallocate benefit-sharing of forest resources in Vietnam (Barney 2005), in line with the ‘Doi Moi’ economic reform (which, with six major economic changes, helped Vietnam come out of the economic crisis in 1986).

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  • With the continued rapid development of the global economy and constant increase in population, the overall demand for wood and wood based products will likely continue to increase in the future. According to a FAO (Food and Agriculture Organization) global outlook study on the trends of demand for wood products, there will be an increase in demand of the order of 20% by 2010. The current concern is whether this future demand for forest products can be met sustainably [FAO 1997].

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Search for a ‘Tree of Life’ in the thicket of the phylogenetic forest...

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  • The idea of producing this book resulted from several realizations for the editors in 1997. The first was an awareness that a large body of biological research from major regions of Costa Rica was available in the literature. In particular, extensive research had been carried out on the lowland Atlantic wet forest, the middle elevation cloud forest (1,400–1,800 m), and the lowland Pacific dry forest over a period of about 30 years. Further, the wet forest had just received a comprehensive biological review by McDade et al.

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