Genetic lineage and environmental conditions as drivers of chromatosome
variation in the anchialine shrimp Halocaridina rubra Holthuis, 1963 (Caridea: Atyidae).
PCNA, proliferating cell nuclear antigen, is the necessary component for DNA duplication of cell chromatosome
. Its synthesis and expression were related to cell proliferative cycle.
The ovarian chromatosome preparation employed here has been described in detail previously (McNamara and Ribeiro, 1999).
The chromatosome preparations were perfused with the various reagents for 110 to 130 min prior to adding RPCH.
In ovarian chromatosome preparations, in vitro, RPCH washout releases the pigment matrix from complete aggregation by an unknown mechanism, which may involve a signaled decrease in myosin activity, possibly via reduced intracellular calcium (McNamara and Ribeiro, 2000), and apparently allows the microtubule system to repolymerize.
olfersi ovarian chromatosomes perfused with RPCH, maximum velocity is attained at some point between 0 and 2 min after pigment aggregation begins (Fig.
To illustrate, chromatosome pigments spontaneously disperse in shrimp epidermal preparations in vitro (Fingerman et al., 1975; Lambert and Fingerman, 1979; McNamara and Taylor, 1987; Tuma at al., 1993), but they aggregate in crab preparations, in the absence of agonists (Lambert and Fingerman, 1976; Kulkarni and Fingerman, 1986).
The ovarian chromatosome preparation employed has been described in detail previously (McNamara and Ribeiro, 1999).
The type of chromatophores that describe the designated authors is red-yellow and the dispersion of pigments on the chromatosomes is, of soft red too intense for the center or soma and strong yellow for the ramifications, although in this study was also observed a red/orange for the ramifications.
Chromatosomes in three phenotypes of Neocaridina denticulata Kemp, 1918: morphological and chromatic differences measured non-invasively.
The colors of melanophores, erythrophores, xanthophores, and cyano-phores are generated by light absorbance on biogenic pigmentary substances that are contained in organelles (chromatosomes
Crustaceans exhibit adaptive chromatic responses to alterations in background color as a consequence of the bidirectional movement of the brightly colored pigment granules present in their pigmentary effectors, or chromatosomes
. Located within the epidermis and in the fibrous capsules surrounding the internal organs, chromatosomes
consist of 2 to 12 uninuclear chromatophores, which are irregular cells constituted by a perikaryon and one or two peripherally ramified cell extensions through which the pigment granules translocate (McNamara, 1981).