Toxicity of 0.3 ppm (96 h LC50 value) and 0.03 ppm of mercuric chloride on the melanophores of the skin at different time intervals has been studied. Mercury treatment causes immediate increase in the number and size ...Toxicity of 0.3 ppm (96 h LC50 value) and 0.03 ppm of mercuric chloride on the melanophores of the skin at different time intervals has been studied. Mercury treatment causes immediate increase in the number and size of the pigment cells. Subsequently these pigment cells form a dense matting of melanophore network with their cell processes intellacing with those of their neighbours. These cells later show degeneration and lysis releasing large quantity of pigment granules into the intercellular spaces in the dermis.Later the pigment cells regenerate several times each followed by degeneration in a cyclic manner. Prolonged treatment with subletha. concentration of mercuric chloride does not show significant alteration in the melanophore density and size. Statistical analysis and wide spread destruction of melanophores observed during 4-6 days of exPosure might help in testing water samples contaminated with lethal concentration of heavy metal salts展开更多
Histological development of Japanese flounder Paralichthys olivaceus larval skin and ultrastructural difference of skin between reared normal and malpigmented Japanese flounder were studied with light microscopy (LM) ...Histological development of Japanese flounder Paralichthys olivaceus larval skin and ultrastructural difference of skin between reared normal and malpigmented Japanese flounder were studied with light microscopy (LM) and transmission electron microscopy (TEM). The results show that the skin develops slowly before the metamorphosis, while at the onset of metamorphosis, the skin develops quickly and becomes complete in structure till about 50 d after being hatched. Ultrastructural observation on the normal and malpigmented skins shows that the iridophore and melanophore are adjacent to each other. Profile and structure of the two kinds of pigment cells are more complete in the skin of normal ocular side than in the skin of pigmented blind side. The ultrastructure of typical chloride cell was observed in the skin of Japanese flounder larvae for the first time.展开更多
Objective: Sequencing of mouse Tbx2 gene andobserving the expression of Tbx2 gene in normal andmalignant melanophore. Methods: The PCR productsof TbX2 cDNA were cloned into PUC18 vector andsequenced. The normal and ma...Objective: Sequencing of mouse Tbx2 gene andobserving the expression of Tbx2 gene in normal andmalignant melanophore. Methods: The PCR productsof TbX2 cDNA were cloned into PUC18 vector andsequenced. The normal and malignant melanocytes wereused to extract total RNA. The expression of Tbx2 genewas detected by RT-PCR. Results: The TbXZ genome iscomposed of seven e-cons and six nitrons. No expressionof Tbx2 gene in the normal melanocytes was noted, butall malignant melanocytes showed expression of TbXZgene. Conclusion: The observation showed the analysisof the genomic structure of mouse TbX2. TbX2 plays acritical role during the development of the malignantmelanophore.展开更多
文摘Toxicity of 0.3 ppm (96 h LC50 value) and 0.03 ppm of mercuric chloride on the melanophores of the skin at different time intervals has been studied. Mercury treatment causes immediate increase in the number and size of the pigment cells. Subsequently these pigment cells form a dense matting of melanophore network with their cell processes intellacing with those of their neighbours. These cells later show degeneration and lysis releasing large quantity of pigment granules into the intercellular spaces in the dermis.Later the pigment cells regenerate several times each followed by degeneration in a cyclic manner. Prolonged treatment with subletha. concentration of mercuric chloride does not show significant alteration in the melanophore density and size. Statistical analysis and wide spread destruction of melanophores observed during 4-6 days of exPosure might help in testing water samples contaminated with lethal concentration of heavy metal salts
基金funded by the NNSF of China(No.30070593)SNSF(No.Y2002D10).
文摘Histological development of Japanese flounder Paralichthys olivaceus larval skin and ultrastructural difference of skin between reared normal and malpigmented Japanese flounder were studied with light microscopy (LM) and transmission electron microscopy (TEM). The results show that the skin develops slowly before the metamorphosis, while at the onset of metamorphosis, the skin develops quickly and becomes complete in structure till about 50 d after being hatched. Ultrastructural observation on the normal and malpigmented skins shows that the iridophore and melanophore are adjacent to each other. Profile and structure of the two kinds of pigment cells are more complete in the skin of normal ocular side than in the skin of pigmented blind side. The ultrastructure of typical chloride cell was observed in the skin of Japanese flounder larvae for the first time.
文摘Objective: Sequencing of mouse Tbx2 gene andobserving the expression of Tbx2 gene in normal andmalignant melanophore. Methods: The PCR productsof TbX2 cDNA were cloned into PUC18 vector andsequenced. The normal and malignant melanocytes wereused to extract total RNA. The expression of Tbx2 genewas detected by RT-PCR. Results: The TbXZ genome iscomposed of seven e-cons and six nitrons. No expressionof Tbx2 gene in the normal melanocytes was noted, butall malignant melanocytes showed expression of TbXZgene. Conclusion: The observation showed the analysisof the genomic structure of mouse TbX2. TbX2 plays acritical role during the development of the malignantmelanophore.
