منابع مشابه
Food and agriculture Chemicals for agriculture
Agricultural production relies heavily on manmade chemicals used as fertilizers and pesticides, and to regulate plant growth. Pesticides are released intentionally into the environment to control insects, weeds, plant diseases and other pests that affect crop or animal production, as well as to control insects that spread human diseases. Pesticides have a well-established role in agriculture an...
متن کاملOrganic agriculture cannot replace conventional agriculture
In this paper, we consider the effect of increasing the area of agricultural land under organic practises. We assumed that organic agriculture does not have effective means of pathogen control. We model pathogen dispersal with a diffusive logistic equation in which the growth/death rate is spatially heterogeneous. We find that if the ratio of the organic plots to conventional plots is below a c...
متن کاملMultifunctional Agriculture: Agriculture Renewal as a Modern Paradigm for Agriculture and Rural Development
Multifunctional agriculture (MFA) has emerged as a key concept in science and politics with respect to the future of agriculture and rural development in the recent decade. Overall, MFA implies that in addition to their main function in production and support of rural livelihood, the agricultural activities have some other advantages for the environment including the conservation of water and s...
متن کاملClinical characteristics of progressive vitiligo
Background and aim: Vitiligo is an acquired idiopathic hypomelanotic disease. The purpose of this study was to review clinical characteristics of vitiligo and their significance in the progression of vitiligo.Materials and methods: Eight hundreds and sixteen cases of vitiligo were studied from February 2005 to October 2006. All of the patients were referred to dermatolo...
متن کاملProgressive thoughts about progressive disease.
In this issue of Clinical Cancer Research , Desai et al. (1) present evidence that new modules appearing in preexisting lesions can represent clonally resistant populations. Imatinib mesylate, the prototypic oral tyrosine kinase inhibitor that has activity against ABL, KIT, and platelet-derived growth factor receptor kinases arguably represents the most important oncologic advance of the past 3...
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ژورنال
عنوان ژورنال: Nature
سال: 1930
ISSN: 0028-0836,1476-4687
DOI: 10.1038/125979a0