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Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
Access control is really a system enabling authorities to manipulate access to areas and resources in a very given physical facility or computer-based information system. Access control is, in fact, a common, everyday phenomenon. For example, a lock over a car door it's essentially a kind of access control. The PIN on the bank's ATM system is another type of access control. Even nightclub bouncers, standing in front of a door, are another example of (perhaps) an even more primitive mode of access control. Using an access control mechanism is essential when persons look to secure confidential, important, or sensitive information and equipment.
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