Construction and working principle of the passive gravity-gradient stabilization for small spacecraft

Рассматриваются пассивные системы ориентации, требующие точного предварительного анализа динамики. В качестве самой оптимальной пассивной системой ориентации взята гравитационная система ориентации. Описан принцип действия такой системы ориентации и предварительная компоновка спутника с этой системой.The passive navigation systems considered demanding the exact preliminary analysis of dynamics. As the most optimum passive navigation system the gravitational navigation system is taken. The principle of orientation of this navigation system and preliminary configuration of the satellite with this system is described

Structure of the pheromone peptide of the Staphylococcus epidermidis agr system

AbstractThe agr quorum-sensing system is responsible for the regulation of several virulence factors in staphylococci, with an extracellular pheromone peptide as signalling molecule. By monitoring the biological activity of synthetic peptides, it could be demonstrated that the pheromone of the agr system in Staphylococcus epidermidis is an octapeptide containing a thiolester linkage between the central cysteine and the C-terminal carboxyl group. The peptide was active at nanomolar concentrations. The N-terminus of the peptide pheromone, which is encoded as part of a protein precursor, proved to be crucial for biological activity