Zoological models and educational zoology models

	ZoS 57/4 - Chromosome model The model shows a submetacentric (centromer away from the middle) metaphase chromosome. The two chromatides are connected with each other in the region of the centromer. Visible there are also the kineto chords oriented to the outside. The slightly irregular surface of the chromatides is explained by the interaction of the chromatin loops coiled on the inside and the supported or imposed proteins. In its lower arm the right chromatide is shown by means of an appropriate cross section without these proteins. As a result the chromatin is visible in the form of different sized loops (loop domains) of the fundamental 30 mm fibril...

	ZoS 57/10 - Protein Model

	ZoS 57/20 - DNA double helix (Type B-DNA), Scale: 30x106:1, made in SOMSO-Plast®. Model in one piece, supplied on a rotating stand. Based on data gained from x-ray diffraction studies, the model shows a section of a DNA double helix. The configuration of this double helix conforms with B-DNA, which is physiologically more significant when compared with the respective A or Z form. It is a clockwise double helix with 10.5 base pairs per coil and equivalent to a passage height of approx. 3.4 nm. It complies, in the main, with the model of DNA structure developed by Watson and Crick in 1953.