منابع مشابه
Determinants of Forest Preservation
Between 1992 and 2003, the global area under preservation has increased 52.8%, such that the terrestrial proportion of the globe now protected is 11.5% (Chape et al. 2003). Since some countries protect more forest than others, we wish to explain this variation using a reduced-form model capable of suggesting whether the amount of forest a country preserves is related to economic and ecological ...
متن کاملThe role of science in the preservation of forest biodiversity
Forest management must change radically to maintain biodiversity. `Biodiversity' has many components, but only one has been measured unambiguously ± species richness ± although there is recently much emphasis on structural, process, and functional diversity. So we must determine exactly what aspects of biodiversity to seek, and why. A battery of suggestions about how to achieve this re-focus on...
متن کاملI-26: Fertility Preservation
Infertility is a very disastrous side effect in young females, especially in traditional male-dominated societies. The aim of this talk is to discuss the possible ways for fertility preservation in both man and woman. Another aspect is to how to predict women at threat of premature ovarian failure. It will also illustrate the association of cytochrome P450 (CYP2C19) polymorphism with ovarian to...
متن کاملThe Collection and Preservation of Plant Material from the Tropical Forest , Canopy
The forest canopy harbors a diverse assemblage of plants of many different growth habits. The reproductive parts of tall trees, many epiphytes, and lianas may exist only in the upper canopy. Access to these upper regions is essential to identify canopy plants and to collect and document voucher specimens for a particular forest region. The majority of botanists, however, have relied on collecti...
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ژورنال
عنوان ژورنال: Science
سال: 1909
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.29.740.383