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Biomedical subjects

S Christie

Publications and source records attributed to S Christie.

48 records · Page 3Linked to original sources
PubMed1976

Analysis of the frequency of sister chromatid exchange in different regions of chromosomes of the kangaroo rat (Dipodomys ordii).

The frequency of sister chromatid exchanges (SCEs) has been determined for C band and non-C band regions of chromosomes of the kangaroo rat after staining with the fluorescence plus giemsa (FPG) technique. After one complete round of DNA synthesis in the presence of bromodeoxyuridine (BrdU) staining of the C band regions revealed simple or complex asymmetries between chromatids. After two complete rounds of DNA synthesis in the presence of BrdU "harlequin" chromosomes were observed. Analysis of the distribution of SCE in chromosomes at their 1st and 2nd mitosis showed that relatively few exchanges occur within C band regions, although the frequency of SCEs is high at the junction between C band and non-C band chromosome regions.

Animals↗
PubMed1975

Chromosomes of a cell line of Dipodomys panamintinus (kangaroo rat). A banding and autoradiographic study.

The chromosomes of an established cell line of Dipodomys panamintinus have been characterised in terms of their C, G and Q banding patterns, and the distributions of silver grains in autoradiographs of chromosomes labelled in early or late S phase. No relationship could be established between C, G or Q banding regions of chromosomes and a particular S phase time of replication of the DNA in these banded regions. The implication of this result to the concept of heterochromatin is discussed.

Animals↗
PubMed1975

Cytogenetics and infertility in man. I. Karyotype and seminal analysis: results of a five-year survey of men attending a subfertility clinic.

A systematic survey of 1599 male patients attending a subfertility clinic has shown that 2.2% were chromosomally abnormal. This frequency was approximately five times higher than that found among the normal male population. The majority of chromosome abnormalities (at least in chromatin-negative males) appeared to be exerting their effect on male fertility through disturbance of spermatogenesis. The contribution made by chromosome abnormalities causing recurrent abortion in wives was negligible. The possible reasons underlying impairment of spermatogenesis in man are discussed in relation to the findings in other species, and the suggestion that some elimination of chromosomally unbalanced gametes occurs from the human male germ line is proposed.

Adult↗
PubMedDate not supplied

Primary reading epilepsy: investigation of critical seizure-provoking stimuli.

Precipitating stimuli were investigated in a 24-year-old woman with primary reading epilepsy. Reading material was presented on a microcomputer video display monitor under controlled conditions while the patient underwent EEG radiotelemetry/video monitoring. We examined the relative contribution of the following variables utilizing a factorial design: eye movements, reading aloud versus reading silently, linguistic complexity, and concentrations. None of these factors acted solely as the critical stimulus in provoking seizures. Seizures were most readily elicited when the patient read aloud, using material of medium or high linguistic complexity with the usual scanning eye movements for reading.

Adult↗