Current Mammalogy by Carleton J. Phillips, Bernard Tandler (auth.), Hugh H.

By Carleton J. Phillips, Bernard Tandler (auth.), Hugh H. Genoways (eds.)

When I first proposed a sequence entitled present Mammalogy to the pub­ lishers, they have been reluctant to adopt this type of venture simply because they seen the sector of mammology as overly fragmented. before everything i discovered this concept to be tough to just accept; in spite of the fact that, upon mirrored image, I got here just about agreeing with it. even if many folks paintings on mammals, we gen­ erally suppose extra allegiance to our specialties, reminiscent of systematics, ge­ netics, cytogenetics, ecology, habit, pest keep an eye on, paleontology, natural world administration, primatology, and marine mammalogy, than we do to the overall box of mammalogy. notwithstanding, instead of turning into discour­ elderly from pursuing this venture, I grew to become extra convinced than ever sequence equivalent to present Mammalogy was once wanted. we are hoping to make this sequence a spot the place experts can current their principles not just to different participants in their distinctiveness, yet to these open air the world in addition. with a bit of luck, this alternate of principles may be a together invaluable workout. The Editorial Board of present Mammalogy has determined to maintain the variety of topics in every one quantity as extensive as attainable instead of focusing on one or issues, within the desire that this may continue the sequence as worthwhile as attainable to the broadest diversity of readers.

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The incipient secretory granules mature as the contents become condensed, and make their way to the cell apex, where they are stored and eventually released (Fig. 3). Since this basic pathway was determined, further details have been added. For example, the transfer of the new proteins from the RER to the Golgi apparatus involves an intermediate organelle complex termed the "GERL" (Novikoff, 1976; Hand, 1980a; Hand and Oliver, 1984). The problems of protein sorting and the transfer of proteins through the stack of Golgi membranes and from the Golgi to secretory vesicles have been attracting considerable attention and is perhaps a subject that will be elucidated fairly soon (Kelly, 1985; Rothman, 1986).

1985). Infraclass comparisons may therefore prove less interesting than comparisons among all of the vertebrate classes. For now, however, the regulated, polarized secretory cells in the diffuse endocrine system clearly hold great promise as a key to our understanding of the evolutionary process at the cellular level in mammals. 28 CARLETON J. 2. Neurons Neurons are an exceedingly complex group of regulated, polarized secretory cells. Neurons are found in many morphological forms, but typically consist of a nerve cell body (perikaryon) with one or more processes (axons and dendrites) that extend from the cell body.

3. Exocrine Cells Exocrine cells are found in a large variety of mammalian glands. This third general group of regulated, polarized secretory cells can be used in infraclass ultrastructural comparisons because these cells are characterized by a recognizable set of architectural features (Fig. 4), they synthesize and export a large variety of complex products, and their products can be correlated with various aspects of behavior, diet, reproduction, and thermoregulation. The study of exocrine cells should yield considerable data on evolution at the cellular level because, as discussed in this section, numerous ultrastructural differences between species have been observed.

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