منابع مشابه
Going, going, gone
The decline and loss of species is inevitable in the face of growing human pressures on the environment but, according to one group of senior researchers, a standard framework is needed to assess the rate of this decline if researchers wish to be effective and policymakers are to take note.
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Monocercomonoides is the first example of a eukaryote lacking even the most reduced form of a mitochondrion-related organelle. This has important implications for cellular processes and our understanding of reductive mitochondrial evolution across the eukaryotic tree of life.
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Essay A nimal migration surely ranks as one of nature's most visible and widespread phenomena. Every minute of every day, somewhere, some place, animals are on the move. The migrants span the animal kingdom, from whales and warblers to dragonflies and salamanders. But is migration an endangered phenomenon? Around the world, many of the most spectacular migrations have either disappeared due to ...
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For those of us engaged in disease investigation and response at the state and local level, the report by Chen and colleagues [1] in this issue of the Journal makes for sobering reading. It describes an outbreak of measles in Arizona where virus transmission predominantly occurred in the health care setting, a scenario of great concern to us all. In reading through the report, I was repeatedly ...
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Choosing what headwords to enter in a dictionary has always been a major question in lexicographical practice. Corpora have greatly helped ease both the choice of words to add, and those to remove, by resorting to frequency counts so as to monitor usage over time. This has been particular valuable in the building of learners dictionaries as, however good earlier word lists may have been, they w...
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ژورنال
عنوان ژورنال: Materials Today
سال: 2008
ISSN: 1369-7021
DOI: 10.1016/s1369-7021(08)70124-x