Zonal centrifuge applied to the purification of Herpesvirus in the Lucké frog kidney tumor

Virus-free adenocarcinoma of the frog (summer phase tumor) transcribes Lucké tumor herpesvirus-specific RNA

[(3)H]RNA isolated from "virus-free," summer phase, renal adenocarcinomas of Rana pipiens labeled with [(3)H]uridine hybridizes with DNA of herpesvirus particles isolated from the winter phase Lucké tumor. Transcription of the herpesvirus genome in virus-free tumors provides additional evidence for the viral etiology of this tumor.

Electron microscopy observations on a new herpes-type virus isolated from Iguana iguana and propagated in reptilian cells in vitro

Ultrastructural observations on a new viral isolate, designated iguana virus, indicate that it is consistently present in intranuclear inclusions, possesses a +/- 115-nm nucleocapsid, ranges from 165 to 300 nm in diameter in the enveloped form, and exhibits cubic symmetry (probably 162 capsomeres). It is concluded that it is a herpes-type virus, the morphological evidence being in agreement with and supporting the biological and physical characteristics presented by Clark and Karzon. Several fine-structural features, among them the encapsidization of small 35-nm hexagonal bodies and the viral membrane envelope enclosure of cell-derived moieties are presented and discussed.

In vitro induction of a herpes-type virus in "summer-phase" Lucké tumor explants

A herpes-type virus was induced in explants of "summer-phase" Lucké tumor maintained on agar slants at 7.5 C for 13 to 14 weeks.