Benjamin Sahlmann

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Some characteristics of early premelanosomes (PM) suggest that primarily a continuous cisternal complex of the endoplasmic reticulum (ER) is transformed simultaneously to PM. These characteristics are: (i) the form and size, which are similar to ER cisternae; (ii) the localization in groups in the ER; (iii) the same stage of maturation within a group; (iv)(More)
The framework for melanin synthesis in the interior of the premelanosomes — the matrix — was subjected to ultrastructural cytochemical examination in cells of the retinal pigment epithelium of chick embryos, in melanocytes of rat skin, and in melanocytes and nevus cells of human skin. The positive results obtained using the silver methods of Thiéry and(More)
Electron-microscopic study of the size of the melanosomes, the mean percentage of melanosomal profile area (MPMA) of the cells, and the duration of melanogenesis in the pigmented layers of the rat's eye (inbred strain BDE/Han) revealed the following: 1) The melanosomes in the cells of the retina vary in size and shape in different locations of the eye. The(More)
The electron microscopic investigation of the m. sphincter pupillae of adult black hooded rats showed the presence of melanosomes in the smooth muscle cells. In shape and size the melanosomes were like those of the iridial epithelium. In addition, premelanosomes and tyrosinase activity were observed as well as melanosomes with disintegrated content and acid(More)
Tetrakis(diisopropyl amide) substituted norbornadiene and quadricyclane derivatives were investigated for their extraction and transport capabilities with alkaline earth metal cations. Both amides exhibited a remarkably high preference of Ba(2+) over any other alkali metal or alkaline earth cation. The binding geometries were determined by quantum chemical(More)
Although the mol-ecular structure of the title compound, C22H32N4O8, displays a twofold symmetry of the mol-ecule including the meth-oxy and methyl substituents, no crystallographic twofold symmetry is observed in the X-ray structure analysis. The carbonyl O atoms alternately point to different sides of the plane defined by the carbonyl C atoms. Two(More)
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