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In many applications like verification or combinatorial optimization, ordered binary decision diagrams (OBDDs) are used as a representation or data structure for Boolean functions. Efficient algorithms exist for the important operations on OBDDs, and many functions can be represented in reasonable size if a good variable ordering is chosen. In general, it is NP-hard to compute optimal or near-optimal variable orderings, and already simple classes of Boolean functions contain functions whose OBDD size is exponential for each variable ordering. For the class of Boolean functions representable by fan-in 2 read-once formulas the structure of optimal variable orderings is described, leading to a linear time algorithm for the construction of optimal variable orderings and the size of the corresponding OBDD. Moreover, it is proved that the hardest read-once formula has an OBDD size of order nβ where .

The use of biomaterials, such as hydrogels, as neural cell delivery devices is becoming more common in areas of research such as stroke, traumatic brain injury, and spinal cord injury. When reviewing the available research there is some ambiguity in the type of materials used and results Basket Blazer Nike Pas Cher are often at odds. This review aims to provide the neuroscience community who may not be familiar with fundamental concepts of hydrogel construction, with basic information that would pertain to neural tissue applications, and to describe the use of hydrogels as cell and drug delivery devices. We will illustrate some of the many tunable properties of hydrogels and the importance of these properties in obtaining reliable and consistent results. It is our hope that this review promotes creative Acheter Nike Blazer Zig Zag ideas for ways that hydrogels could be adapted and employed Basket Blazer Nike Pas Cher for the treatment of a broad range of neurological disorders.

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