Biomaterial Database

Studies on the color-change mechanism in a fresh-water teleost, Nandus nandus (Ham.). II. Hormonal control. 1978

A K Jain, and H N Bhargava

The chromatic spinal sectioning (mostly at 3rd, 3/4th and 4th vertebral levels) produced the maximal darkening in the fish. This darkening persisted in the fish on a black background, but a slow and gradual paling occurred in the operated animals when placed over a white background. These animals reached the maximum paling in 168 h as compared to the unoperated ones where similar state of paling was attained in a comparatively shorter period (3 to 5 h). The distinct difference in the results in respect of the rates of paling in the operated (melanophores under hormonal control only) and unoperated animals clearly suggests the involvement of a pituitary-borne melanophore-aggregating hormone (MAH) in the chromatic control mechanism of the fish Nandus nandus.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008547	Melanophores	Chromatophores (large pigment cells of fish, amphibia, reptiles and many invertebrates) which contain melanin. Short term color changes are brought about by an active redistribution of the melanophores pigment containing organelles (MELANOSOMES). Mammals do not have melanophores; however they have retained smaller pigment cells known as MELANOCYTES.	Melanophore
D010858	Pigmentation	Coloration or discoloration of a part by a pigment.	Pigmentations
D003116	Color	The visually perceived property of objects created by absorption or reflection of specific wavelengths of light.	Colors
D004777	Environment	The external elements and conditions which surround, influence, and affect the life and development of an organism or population.	Environmental Impact,Environmental Impacts,Impact, Environmental,Impacts, Environmental,Environments
D005260	Female		Females
D005399	Fishes	A group of cold-blooded, aquatic vertebrates having gills, fins, a cartilaginous or bony endoskeleton, and elongated bodies covered with scales.
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013116	Spinal Cord	A cylindrical column of tissue that lies within the vertebral canal. It is composed of WHITE MATTER and GRAY MATTER.	Coccygeal Cord,Conus Medullaris,Conus Terminalis,Lumbar Cord,Medulla Spinalis,Myelon,Sacral Cord,Thoracic Cord,Coccygeal Cords,Conus Medullari,Conus Terminali,Cord, Coccygeal,Cord, Lumbar,Cord, Sacral,Cord, Spinal,Cord, Thoracic,Cords, Coccygeal,Cords, Lumbar,Cords, Sacral,Cords, Spinal,Cords, Thoracic,Lumbar Cords,Medulla Spinali,Medullari, Conus,Medullaris, Conus,Myelons,Sacral Cords,Spinal Cords,Spinali, Medulla,Spinalis, Medulla,Terminali, Conus,Terminalis, Conus,Thoracic Cords