PubMed · 15238475
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Penny L Lindballe. 2004-07-06. Elective cesarean section.. https://doi.org/10.1503/cmaj.1040497
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Numerous non-mammalian vertebrates have evolved lethal venoms to aid either in securing prey or as protection from predators, but modern mammals that use venoms in these ways are rare, including only the duck-billed platypus (Ornithorhynchus), the Caribbean Solenodon, and a few shrews (Soricidae) (Order Insectivora). Here we report evidence of a venom delivery apparatus in extinct mammals, documented by well-preserved specimens recovered from late Palaeocene rocks in Alberta, Canada. Although classified within Eutheria, these mammals are phylogenetically remote from modern Insectivora and have evolved specialized teeth as salivary venom delivery systems (VDSs) that differ markedly from one another and from those of Solenodon and shrews. Our discoveries therefore show that mammals have been much more flexible in the evolution of VDSs than previously believed, contradicting currently held notions that modern insectivorans are representative of the supposedly limited role of salivary venoms in mammalian history. Evidently, small predatory eutherians have paralleled colubroid snakes in evolving salivary venoms and their delivery systems several times independently.
This study investigated the use of health-related services by low-income Canadians living in two large cities, Edmonton and Toronto. Interview data collected from low-income people, service providers and managers, advocacy group representatives, and senior-level public servants were analyzed using thematic content analysis. Findings indicate that, in addition to health care policies and programs, a broad range of policies, programs, and services relating to income security, recreation, and housing influence the ability of low-income Canadians to attain, maintain, and enhance their health. Furthermore, the manner in which health-related services are delivered plays a key role in low-income people's service-use decisions. We conclude the paper with a discussion of the health and social policy implications of the findings, which are particularly relevant within the context of recent health care reform discussions in Canada.
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