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单词 development
释义
development

Biology
  • The complex series of changes that occurs in multicellular living organisms as they progress from the initial fertilized egg via an embryo stage to the mature individual. Fundamentally important processes in development include: cell division; the determination of cell fate; differentiation to form the distinct types of cells; morphogenesis, whereby cells are arranged as tissues and organs; and growth, whether by increase in cell number or size. In vertebrate animals there are three developmental stages: (1) cleavage, in which the zygote divides to form a ball of cells, the blastula; (2) gastrulation, in which the cells become arranged in three primary germ layers (see gastrula); (3) organogenesis (or organogeny), in which further cell division and differentiation results in the formation of organs. The development of many invertebrates (e.g. insects) and amphibians involves the process of metamorphosis. In all organisms, development is directed by the coordinated expression of various genes in time and space, regulated by the complex interplay of the gene products (see morphogen). Early development may be influenced by maternal genes (see maternal effect genes) or cytoplasmic segregation of cell fate determinants, as well as embryonic genes. Genes involved in development are often highly conserved across very diverse organisms, as exemplified by the Hox genes that determine the structures along the head-to-tail axis of most animals. Many organisms can modify their development in response to environmental cues. Such developmental plasticity enables them to adapt to variations in environmental conditions, such as changes in food supply or climate. For example, in some turtles the incubation temperature determines the sex and other traits of the hatchlings, such as adult body size, a mechanism that maximizes reproductive fitness. See also abc model; homeotic genes; morphogenesis; primary growth; secondary growth.


Geography
  • The use of resources to relieve poverty and raise living standards; the means by which a traditional, low-technology society is changed into a modern, high-technology society, with a corresponding increase in incomes. This can be done through mechanization, improvements in infrastructure and financial systems, and the intensification of agriculture. This definition is based on the more obvious distinctions in living standards between developed and less developed countries. Narrowly economic definitions of development have been criticized, and many believe that true development includes social justice; ‘a focus on “global social justice” could provide a framework to think interesting and possibly dangerous thoughts about how to take the international development agenda beyond the relatively instrumental approach of the Millennium Development Goals’. Maxwell (2008) ODI Opin. reflect on the means and ends of development in its various forms. For example, Smith (2002) Area 34 argues against development as ‘some neutral concept of progress’ and Andolina et al. (2005) Pol. Geog. 24, 6, argue that as ‘indigenous movement platforms and concepts are increasingly institutionalized…their demands for culturally appropriate government and development are in practice implemented as governmentally and developmentally appropriate culture’. Potter (2001) Area 33 argues that development is a non-linear process, and ‘one should not mimic the experience of “developed” countries’. ‘For many local communities, the maintenance of social and cultural practices is central to participatory development and just as important as income gains and poverty reduction’ (Connell (2007) Sing. J. Trop. Geog. 28, 2). O’Reilly (2007) AAAG 97, 3 observes that women’s participation in development is a dialogic process that includes negotiating how women fieldworkers will participate within their own organizations; see also Sharpe et al. (2003) TIBG 28, 3. Development indicators as measurements are simply concerned with statistics and do not indicate social structures and patterns of behaviour; there is no definitive definition of what development should be for each society, and no blueprint for how to achieve it. See D. Gasper (2004). Ethnodevelopment interprets culture and indigenous identity in ways that make it compatible with neoliberal social policy, but potentially restrict indigenous agency (Laurie et al. (2005) Antipode 37, 3).

    http://data.worldbank.org/ World Bank development indicators.


Economics
  • See economic development.


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