منابع مشابه
Fatal attraction
L ook carefully at a solitary animal and you will find that it is not so alone after all. Animals play host to entire ecosystems that teem with diverse life. Some of the microbes that live on (or in) animals are beneficial to their host. However, these microbes' more sinister brethren, parasites and pathogens, cause damage and disease. Between these two extremes is a class of organisms that, it...
متن کاملFatal Attraction Evaded
Antimicrobial polypeptides are widely distributed effec-tors of host defense in animals and plants. They include enzymes that digest vital microbial structures (e.g., lysozyme, neutrophil elastase, phospholipase A2), substances that bind and sequester iron or other essential nutrients (e.g., lacto-ferrin), and polypeptides that insert into and disrupt microbial membranes (e.g., bactericidal per...
متن کاملAnimal Phylogeny: Fatal Attraction
MPhylogenetic analyses of hundreds of genes from model animals have placed flies closer to vertebrates than to nematodes; recent work suggests this may be due to an artefact known as long branch attraction.
متن کاملFatal attraction: rare species in the spotlight
The exploitation of rare and endangered species can end in the species's extinction because the increased value people associate with rarity increases the economic incentive to exploit the last individuals, creating a positive feedback loop. This recently proposed concept, called the anthropogenic Allee effect (AAE), relies on the assumption that people do value rarity, but this remains to be e...
متن کاملStem Cells and Metastatic Cancer: Fatal Attraction?
N eural stem cells (NSCs) are generally defi ned by their dual capacity to self-renew and differentiate into more specialized cell types such as neurons and glia. NSCs have been the object of many studies aimed at neuron replacement therapy in several degenerative conditions of the central nervous system such as Parkinson disease, Alzheimer disease, multiple sclerosis, and amyotrophic lateral s...
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ژورنال
عنوان ژورنال: Science
سال: 2002
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.298.5601.2095a