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Wireless sensor networks(WSN) are randomly deployed in adversary or dangerous environments so that the security of WSN is extremely important. It is necessary to use encryption system to provide security. However, due to lack of energy and storage, typical key management scheme is not suitable for WSN. We propose an efficient key management scheme for WSN.(More)
Mechanisms of soil Pb immobilization by Bacillus subtilis DBM, a bacterial strain isolated from a heavy-metal-contaminated soil, were investigated. Adsorption and desorption experiments with living bacterial cells as well as dead cells revealed that both extracellular adsorption and intracellular accumulation were involved in the Pb(2+) removal from the(More)
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