In the brass instrument family, the sound can be modified or attenuated using BIOTIN SHAMPOO a mute, which is usually inserted in the bell of the instrument.The objective of this paper is to study the principle and the technological feasibility of an active mute using loudspeakers placed in front or around the instrument bell.This mute must reduce
The influence of light and the place of its perception on the flowering of Pharbitis nil.
The estimation of participation and density of forage species in several xerothermic communities of the Lublin Upland were carried out in 2004 and 2005.Most plants species visited by bees are grouped in plots of Limited Editions the Brachypodio-Teucrietum and the Adonido-Brachypodietum pinnati communities.The nectariferous and polleniferous taxons
Ice and mineral licks used by caribou in winter
In winter, barren-ground caribou obtain minerals from ice and soil licks.Between December and April we have seen caribou cratering on the surface of frozen lakes and licking the ice.Ice samples from eight licks on four lakes contained concentrations of calcium, magnesium, BIOTIN SHAMPOO sodium, potassium, phosphorus, chloride and sulphate many time