Morphology, defined

P americana is one of just a few species of insects in which both peripheral and central olfactory processing have been studied. In contrast to many short-lived lepidopterans, in which the male antenna is highly specialized for sex pheromone reception, the antennae of male cockroaches contain numerous food-responsive sensilla. In addition to olfactory sensilla, the antennae also house mechano-, hygro-and thermoreceptors, as well as contact chemoreceptors (Schaller, 1978 review Boeckh et al., 1984). Extensive ultrastructural and electrophysiological evidence has demonstrated that morphologically defined sensillum types house receptor cells of specific functional types (Sass, 1976, 1978, 1983 Schaller, 1978 Selzer, 1981, 1984 review Boeckh and Ernst, 1987). Boeckh and Ernst (1987) defined 25 types of cell according to their odor spectra, but of the 65 500 chemo- and mechanosensory sensilla on the antenna of adult male P. americana, an estimated 37 000 house cells that respond to periplanone-A and periplanone-B. 

Although the basic architecture of all eukaryotic cells is formed by membranes, organelles, and cytosol, each cell type exhibits a distinct morphology defined by cell shape and localization of organelles. The structural basis of the characteristic morphology of each cell type is the cytoskeleton, a dense network of three classes of filamentous proteins that permeate the cytosol and support the cell membrane. 

The peak half-width is quite large ( 20 cm ), as expected for a poorly morphologically defined sample for which inhomogeneous broadening effects occur. 

Hunter C, Petralia RS, Vu T, Wenthold RJ (1993) Expression of AMPA-selective glutamate receptor subunits in morphologically defined neurons of the mammalian cochlear nucleus. J Neurosci 75 1932-1946. 

Alternatively, a model which considers granular film morphology defines the mobility as... 

The application of the typological species concept to practical taxonomy results in the morphological defined species. (Mayr, 1957 11-12)... 

Indeed, the concept of stereochemistry is almost as old as organic chemistry itself. In 1848, Louis Pasteur (France 1822-1895) found that tartaric acid (9) existed in two forms that we now know differ only in their ability to rotate plane-polarized light in different directions (they are examples of stereoisomers). Pasteur observed that the crystals had a different morphology, defined here as their external structure, and he was able to separate these two forms by peering through a microscope and using a pair of tweezers to separate them physically. Because of this difference, the two forms of tartaric acid are considered to be different compounds, now called enantiomers (see Chapter 9). 

In its broadest sense, histochemistry is the chemical study of morphologically defined plant or animal material. The methodology varies. The form... 

Molecular variation within and between morphologically defined species is currently a poorly studied field. The few studies of species and species complexes made so far within the Amblystegiaceae and Calliergonaceae indicate that many of our ideas regarding the species circumscriptions will have to be revised in the future. 

Of paramount importance to our subsequent discussion on the role, regulation and control of metabolic hydrolysis is an understanding of the morphological and biochemical substrate underlying the concept of the lysosomal-vacuolar apparatus. Central to this theme is the presence of an intracellular membrane-bound vacuolar system. The biochemically and morphologically defined entities of the lysosomal-vacuolar apparatusi... 

Most morphologically defined species have a constant chemistry, usually one cortical substance (e. g. usnic acid, atranorin) and one or more medullary substances, and justify the use of this criterion in lichen taxonomy. The three common patterns of chemical variation are those of replacement type compounds, accessory type compounds and chemosyn-dromic variation. These are discussed in turn. 

Independent of the mechanism, the blend s final morphology is the result of the cross-link formation and phase separation formation during the cure, being both highly interlaced. Optical and mechanical blend properties are affected by final morphology, defining the material application [27,30,32]. 

The polymer morphology defines the intermolecular packing of the polymer molecules as crystals or spherulites in the bulk. 

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