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Typically these B-cells are so short-lived , that once the pathogen is eliminated , we would expect these B-cells to die out , which means that if the pathogen were encountered again , the immune system would have to go through the whole affinity maturation process again . Prospective volunteers that come to MMSD through a sponsoring organization such as the Retired Senior Volunteer Program that has already completed a criminal record check , will not be checked again by the District , unless the volunteer has a record . Prospective student teachers that come to MMSD through a sponsoring organization that has already completed a criminal record check will not be checked again by the District unless the student teacher has a record . If a review of the applications does not reflect such availability , the department will extend the posting period and broaden its recruitment efforts unless the Affirmative Action Officer indicates a good faith effort has been made . In general , an employee will retain his / her current rate of pay for the additional hours unless the contract specifies a different rate of pay for the extra assignment ( for teacher positions , refer to the extra-duty compensation schedule in the Teacher Collective Bargaining Agreement ) . The Principal will contact the reference ( s ) of the successful candidate before the Principal recommends that such candidate be employed by the Board of Education unless the Principal is informed that a successful reference check has already been made . Under these conditions , the property developed would become the property of the Board . After consultation with the chairperson of each committee on which citizens serve , the Board President shall recommend to the Board the nomination of citizens to serve on each committee on which citizens serve . More specialized projects can probe the details of functioning of a single data structure : for instance , you can investigate the expected number of rotations in an insertion or deletion in an AVL tree , the expected number of levels through which an element is sifted in a binary heap during insertion or deletion , etc. Another possibility is to study the cache behavior of various implementations of the same data structure - - write code to allocate storage differently in a tree , or compare linear probing ( next location in the table ) with double hashing or quadratic probing in terms of both running time and number of probes , testing to see if there is a crossover value . The innate immune system primarily consists of the endocytic and phagocytic systems , which involve roaming scavenger cells , such as phagocytes , that ingest extracellular molecules and materials , clearing the system of both debris and pathogens .