Results 151 to 160 of about 1,656 (186)

Stimulation of Cultured Iridophores by Amphibian Ventral Conditioned Medium

Pigment Cell & Melanoma Research, 1990
That 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
Toshihiko Fukuzawa, Joseph Bagnara, J T Bagnara   +2 more
exaly   +3 more sources

Guanine formation in isolated iridophores from bullfrog tadpoles

Biochimica Et Biophysica Acta - General Subjects, 1972
Iridophores 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, T Hama
exaly   +3 more sources

Electrowetting-controlled bio-inspired artificial iridophores

Proceedings of SPIE, 2011
Many 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
exaly   +2 more sources

Reflecting on the iridophore transcriptome, and more

Pigment Cell & Melanoma Research, 2013
Mammals 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
openaire   +1 more source

Iridophores in the Mantle of Giant Clams

Australian Journal of Zoology, 1992
Iridophores 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
openaire   +1 more source

Iridophore development in wild-type and periodic albinoXenopus larvae

Experientia, 1981
Light 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
openaire   +2 more sources

Cephalopod coloration model I Squid chromatophores and iridophores

Journal of the Optical Society of America A, 2008
We have developed a mathematical model of skin coloration in cephalopods, a class of aquatic animals. Cephalopods utilize neurological and physiological control of various skin components to achieve active camouflage and communication. Specific physical processes of this coloration are identified and modeled, utilizing available biological materials ...
Richard L, Sutherland, Lydia M, Mäthger, Roger T, Hanlon, Augustine M, Urbas, Morley O, Stone   +4 more
openaire   +2 more sources

Guanine and hypoxanthine formation in iridophores of the bullfrog tadpole.

Biochimica et biophysica acta, 1972
Abstract 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
openaire   +3 more sources

Organellogenesis of the cephalopod iridophore: Cytomembranes in development

Journal of Ultrastructure Research, 1967
The iridophore of the cephalopod iris and skin develop by the concurrent fusion of Golgi-derived vesicles, to form new cell surface, and by the condensation of ribosome-sized granules, to form dense membrane-bound iridosomal platelets. Microtubules parallel the platelets in their formation and appear to be important in either alignment or transport of ...
openaire   +2 more sources

The effects of intermedin on the ultrastructure of amphibian iridophores

General and Comparative Endocrinology, 1969
The 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.
openaire   +2 more sources