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Prof. Hans Gelderblom - Retroviris Defibitions
We need a definition of a retrovirus particle. Professor Hans Gelderblom from the Koch Institute in Berlin, the world's leading figure in the electron microscopy of "HIV", defines retroviruses as "enveloped viruses with a diameter of 100-120 nm [nanometre=10-9 metre] budding at cellular membranes. Cell released virions contain condensed inner bodies (cores) and are studded with projections (spikes, knobs)" [4]. We also need to know that retroviruses are divided into three subfamilies (0ncovirinae, Lentivirinae and Spumavirinae). The subfamily Oncoviruses are subdivided into the genuses type -A, -B, -C, and -D particles [5]. See here. Retroviral particles also share a physical property of concentrating (banding) at a density of 1.16 gm/ml when centrifuged at high speeds in sucrose density gradients, a fact long used in their purification. See question x for further discussion. source...
see also:
Pasteur Institute Definitions - Rules of Isolation
Robert Koch Postulates
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