Feathered Friends in September

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 ...

Polyamines 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...

The little feathered ecosystem engineer

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...

Fates of feathered fruit-eaters in fragmented forests

Friends in High Places.

We demonstrate that personal connections amongst U.S. politicians have a significant impact on Senate voting behavior. Networks based on alumni connections between politicians are consistent predictors of voting behavior. We estimate sharp measures that control for common characteristics of the network, as well as heterogeneous impacts of a common network characteristic across votes. We find th...