Results 121 to 130 of about 1,094 (155)
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Transformation of amphibian iridophores into melanophores in clonal culture
Developmental Biology, 1976Abstract Iridophores isolated from bullfrog tadpoles were successfully cloned. In primary culture, the iridophores showed contraction of cell bodies by the addition of alkali-treated ACTH. The disappearance of reflecting platelets occurred in proliferating iridophores and many small black melanin granules were synthesized in the cells.
Hiroyuki Ide, Tadao Hama
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Stimulation of Cultured Iridophores by Amphibian Ventral Conditioned Medium
Pigment Cell & Melanoma Research, 1990That the ventral integument of adult frogs (Rana pipiens) contains factor(s) that stimulate iridophore expression (adhesion, morphologic appearance, proliferation) was demonstrated on iridophores derived from tadpoles of R. pipiens and Pachymedusa dacnicolor, and maintained in primary culture in a growth medium based upon Leibovitz's L‐15. Experimental
Joseph T Bagnara, Toshihiko Fukuzawa
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Guanine formation in isolated iridophores from bullfrog tadpoles
Biochimica Et Biophysica Acta - General Subjects, 1972Iridophores were isolated from the peritoneum of bullfrog tadpoles by the method of trypsin digestion followed by Ficoll density gradient centrifugation. Guanine and hypoxanthine were found in the isolated iridophores. The incorporation of the label of [3H]guanosine into guanine was demonstrated using the isolated iridophores.
Tadao Hama, Hiroyuki Ide
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Electrowetting-controlled bio-inspired artificial iridophores
Proceedings of SPIE, 2011Many marine organisms have evolved complex optical mechanisms of dynamic skin color control that allow them to drastically change their visual appearance. In particular, cephalopods have developed especially effective dynamic color control mechanism based on the mechanical actuation of the micro-scale optical structures, which produce either ...
Supone Manakasettharn, J Ashley Taylor
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Iridophores and their interactions with other chromatophores are required for stripe formation in zebrafish [PDF]
Development (Cambridge), 2013 Colour patterns of adult fish are produced by several types of pigment cells that distribute in the dermis during juvenile development. The zebrafish, Danio rerio, displays a striking pattern of dark stripes of melanophores interspersed by light stripes of xanthophores.
Hans Georg Frohnhöfer +2 more
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Iridophores in the Mantle of Giant Clams
Australian Journal of Zoology, 1992Iridophores in the mantle of the giant clams Tridacna gigas and T. crocea comprise an aggregation of cells (iridocytes) containing stacks of regularly arranged platelet, (iridosomal platelets) of uniform thickness (c. 70 nm). The platelets are separated by cytoplasm of roughly the same thickness permeated by a single flattened cisterna, the bounding ...
DJ Griffiths, H Winsor, T Luongvan
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Reflecting on the iridophore transcriptome, and more
Pigment Cell & Melanoma Research, 2013Mammals and poikilotherms share two melanized pigment cell types, the melanocytes derived from the neural crest and the retinal pigmented epithelium (RPE) derived from the brain (Bharti et al., 2006). Zebrafish, chicken and human studies have identified some of the main genes involved in melanin production in the RPE; however, the extent to which the ...
Alberto Lapedriza, Robert Kelsh
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Iridophore development in wild-type and periodic albinoXenopus larvae
Experientia, 1981Light microscopic studies of iridophore preparations from ap mutantXenopus larvae revealed abnormalities in the morphology and size distribution of reflecting platelets; purine synthesis is normal. A pleiotropic effect of the ap gene on melanoblasts and iridoblasts is proposed.
G J, MacMillan, A M, Gordon
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Guanine and hypoxanthine formation in iridophores of the bullfrog tadpole.
Biochimica et biophysica acta, 1972Abstract 1. 1. The mechanism of guanine and hypoxanthine formation in iridophores was studied using the ventral skin of bullfrog tadpoles. 2. 2. Incubation mixtures containing skin extract, guanosine or deoxyguanosine and inorganic phosphate yielded guanine, and incubation mixtures containing inosine or adenosine, instead of guanosine or ...
H, Ide, T, Hama
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The effects of intermedin on the ultrastructure of amphibian iridophores
General and Comparative Endocrinology, 1969The ultrastructure and pigment composition of untreated and intermedin-treated integumental iridophores of three species of amphibians, Hyla cinerea, H. arenicolor, and Agalychnis dachnicolor, were examined by electron microscopy and by purine analysis.
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