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Biomedical subjects

R D Wallace

Publications and source records attributed to R D Wallace.

5 recordsLinked to original sources
PubMed1991

Microcystic adnexal carcinoma.

Microcystic adnexal carcinoma is an unusual, locally aggressive tumor that recently has been recognized as a distinct clinicopathologic entity. It typically occurs on the face of young or middle-aged women and often requires extensive surgical excision to gain local control. A case involving the upper lip and columella of a young woman is described and the available literature reviewed. The difficult reconstructive challenge this lesion usually presents is illustrated in this patient who required upper lip and complete columellar reconstruction.

Adult↗
PubMed1986

Identical twins discordant for presenile dementia of the Alzheimer type.

In genetically proven identical female twins, discordant for presenile dementia of the Alzheimer type, the affected twin began to dement at the age of 49, and died 15 years later; the diagnosis was confirmed at post-mortem. The surviving twin remains clinically unaffected 20 years after the onset of dementia in her sister. Environmental aetiological factors are postulated to account for this discordance.

Alzheimer Disease↗
PubMed1972

State of adenovirus 2 deoxyribonucleic acid in the nucleus and its mode of transcription: studies with isolated viral deoxyribonucleic acid-protein complexes and isolated nuclei.

Newly replicated adenovirus 2 deoxyribonucleic acid (DNA) can be isolated from the nucleus of HeLa cells by a gentle lysis procedure as a fairly homogeneous complex with a sedimentation of 73S. The viral DNA complex can be prepared completely free from host cell DNA. The viral complex is slightly active in ribonucleic acid (RNA) synthesis in vitro. Treatment of the complex with Pronase and sodium dodecyl sulfate converts the DNA to a form which sediments at 43S. Nuclei isolated from adeno-infected cells synthesize high-molecular-weight virus-specific RNA in vitro. Optimal RNA synthesis requires a divalent cation, preferentially manganese, and relatively high salt concentrations. The synthesis of virus-specific RNA by the isolated nuclei is strongly inhibited by low doses of alpha-amanitine. The latter experimental result is discussed in terms of the polymerase used to transcribe the adenovirus DNA in vivo.

Adenoviridae↗