Abstract: A microperifusion system includes at least one perifusate reservoir module having N receptacles and at least one port to communicate a pressurizing gas into or out from the respective perifusate reservoir module. A corresponding perifusion chamber module having M microperifusion channels is mechanically coupleable to at least one perifusate reservoir module to thereby form, when coupled, a sealed fluid communication between a selected first number of the N receptacles and a selected second number of the microperifusion channels. A control system module is coupleable to each perifusate reservoir and each perifusion chamber to control a flow of pressuring gas communicated into or out from the perifusate reservoir sense an effect of a microperifusion test operation occurring in each microperifusion channel.

Abstract: A policy auditing service can be implemented, in accordance with at least one embodiment that obtains a set of parameters that indicates a snapshot of a policy configuration for an account, a query, and a security policy. The security policy may encode a security requirement or invariant. The policy auditing system may determine states that can be reached via mutative operations (e.g., role assumption) and use a policy analyzer service to determine whether assuming a role results in a grant of access that is at least as permissive as the security policy of the set of parameters.

Abstract: A microperifusion system includes at least one perifusate reservoir module having N receptacles and at least one port to communicate a pressurizing gas into or out from the respective perifusate reservoir module. A corresponding perifusion chamber module having M microperifusion channels is mechanically coupleable to at least one perifusate reservoir module to thereby form, when coupled, a sealed fluid communication between a selected first number of the N receptacles and a selected second number of the M microperifusion channels. A control system module is coupleable to each perifusate reservoir and each perifusion chamber to control a flow of pressuring gas communicated into or out from the perifusate reservoir sense an effect of a microperifusion test operation occurring in each microperifusion channel.