منابع مشابه
The Feathered Clarinet Reed
In this research, a method previously applied to improve a digital simulation of the avian syrinx is adapted to the geometry of the clarinet reed. The clarinet model is studied with particular attention to the case when the reed beats again the lay of the mouthpiece, closing off air flow to the bore once each period. In place of the standard reed table which gives steady-state volume flow as a ...
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All animals have an effect on the environment, but some key species – called ecosystem engineers – can have a particularly large influence. Their impact can be positive, by creating and maintaining habitats and increasing biodiversity, but they can also be negative, by destroying habitats and reducing biodiversity. Interestingly, the magnitude of the effect that an ecosystem engineer has on the...
متن کاملPolyamines content in meat of feathered game
Information about polyamines content in food is of great interest for many researches and dieticians. The reason for increasing interest is due to polyamines specific biological role, including participation in tumour growth. In the study the content of polyamines (spermine and spermidine) in the breast and thigh muscles of selected feathered game, killed in a way typical for used farming metho...
متن کاملRanking Friends ∗
We investigate the scope for cooperation within a community engaged in repeated reciprocal interactions. Players seek the help of others and approach them sequentially according to some fixed order, that is, a ranking profile. We study the ranking profiles that correspond to the social structures that are most effective in sustaining cooperation in equilibrium, that is, social structures that s...
متن کاملMid-Mesozoic Flea-like Ectoparasites of Feathered or Haired Vertebrates
Parasite-host associations among insects and mammals or birds are well attended by neontological studies [1]. An Eocene bird louse compression fossil [2, 3] and several flea specimens from Eocene and Oligocene ambers [4-8], reported to date, are exceptionally similar to living louse and flea taxa. But the origin, morphology, and early evolution of parasites and their associations with hosts are...
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ژورنال
عنوان ژورنال: Nature
سال: 2006
ISSN: 0028-0836,1476-4679
DOI: 10.1038/439914a