Polymers comprising a polyethylenimine having a molecular weight less than 600 Daltons, a biodegradable group, and a relatively hydrophobic group that are useful for the delivery of bioactive agents to cells. The images are processed by taking the weighted difference of two or more spectral components and applying a demeaning or whitening filter to the result. The inner part itself includes contact lamellae, which rest against a mating component, preferably a knife blade, at a contact point. The bootstrap configuration data is used to establish a secure management connection between the network device and a secure management gateway. Access path resource consumption is computed and virtual machines with resource consumptions that violate the resource capacity policy are identified. The two information devices use identical non-private key data to achieve an initial connection, and exchange their own unique network card ID numbers.