Biomaterial Database

Low cost internegatives from electron micrographs of metal shadowed objects. 1978

H Boye, and M Rønne

Some observers prefer a contrast reversal of electron micrographs of metal shadowed objects, so that the metal-free shadows appear dark on the print. There are several ways of obtaining contrast reversal, and the reasons for using 35 mm internegatives are given and a setup for re-photography of electron microscopy films is described together with a modified enlarger. Both are equipped with nearpoint illumination, which can be diffused in a simple manner with minimal loss of intensity. Other features are a particularly rigid camera stand combined with a numbering device, and a glass- and scratch-free negative holder for the enlarger. The choice of lens for the re-photography is discussed.

UI	MeSH Term	Description	Entries
D008411	Chytridiomycota	A phylum of fungi that was formerly considered a subdivision of Phycomycetes. They are the only fungi that produce motile spores (zoospores) at some stage in their life cycle. Most are saprobes but they also include examples of plant, animal, and fungal pathogens.	Mastigomycotina
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D010784	Photomicrography	Photography of objects viewed under a microscope using ordinary photographic methods.	Photomicrographies