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The bacteriophage population is large, dynamic, ancient, and genetically diverse. Limited genomic information shows that phage genomes are mosaic, and the genetic architecture of phage populations remains ill-defined. To understand the population structure of phages infecting a single host strain, we isolated, sequenced, and compared 627 phages of(More)
PURPOSE OF THE STUDY Researchers have posited a depletion syndrome among older adults that resembles "depression without sadness." Disengagement-related theories such as socio-emotional selectivity and gerotranscendence also describe an adaptive narrowing of the older person's social world and decreasing investment in activities and social relationships.(More)
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