By Carleton J. Phillips, Bernard Tandler (auth.), Hugh H. Genoways (eds.)
When I first proposed a chain entitled present Mammalogy to the pub lishers, they have been reluctant to adopt one of these venture simply because they considered the sector of mammology as overly fragmented. initially i discovered this concept to be tough to just accept; besides the fact that, upon mirrored image, I got here just about agreeing with it. even if many folks paintings on mammals, we gen erally think extra allegiance to our specialties, corresponding to systematics, ge netics, cytogenetics, ecology, habit, pest regulate, paleontology, flora and fauna administration, primatology, and marine mammalogy, than we do to the overall box of mammalogy. despite the fact that, instead of changing into discour elderly from pursuing this undertaking, I turned extra sure than ever sequence comparable 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 individuals in their distinctiveness, yet to these outdoors the world to boot. expectantly, this trade of principles should be a collectively worthy workout. The Editorial Board of present Mammalogy has determined to maintain the variety of matters in each one quantity as wide as attainable instead of targeting one or issues, within the desire that this may maintain the sequence as priceless as attainable to the broadest variety of readers.
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1984) were able to colocalize VIP- and neuropeptide Y (NPY)-like immunoreactivity in nonadrenergic neurons in these species. How these combinations of molecules influence ultrastructural images is unknown and the extent to which various neuropeptides occur in combination also is uncertain. For whatever reasons, synaptic vesicles and neurons, in marked contrast to the various diffuse endocrine cells discussed in the previous section, do not lend themselves well to TEM comparisons, despite the fact that some of the same or nearly identical molecules are synthesized and exported by both neurons and endocrine cells.
Lastly, a number of excellent examples of the use of comparative ultrastructure in systematics involve studies of mammalian spermatozoa. Rouse and Robson (1986) recently reviewed the data available for primates and concluded that "spermatozoal ultrastructure appears to represent a valid phylogenetic tool .... , 1981, 1982). Finally, spermatozoan ultrastructure has been used to address the question of the evolutionary origin of bats. Forman (1968), Forman et al. (1968), and Forman and Genoways (1979) had pointed out previously that chiropteran spermatozoa varied morphologically and that light microscopic comparisons of these cells might be valuable to resolution of systematic problems.
Rhodopsin is the visual pigment of the rod photoreceptors; it is a conjugate of opsin (a protein synthesized in the photoreceptor myoid region) and ll-cisretinal, which is its chromophore. After ll-cis-retinal is hydrolyzed from opsin, it is reduced to retinol, transferred by some unknown means to the RPE cells, stored, and then eventually returned to the rod outer segment through the tips of the elongate apical microvilli that characterize the RPE cells (Williams and Penn, 1985). The RPE also degrades the distal membrane discs of the outer segment of rod photoreceptors, and the RPE cytoplasm is therefore typically filled with phagosomes, lysosomes, and melanolysosomes (Leuenberger and Novikoff, 1975).