Biomedical subjects

R J Morrison

Publications and source records attributed to R J Morrison.

8 recordsLinked to original sources

PubMed1988

Spontaneous formation of compound X chromosomes in Drosophila melanogaster.

Males carrying different X chromosomes were tested for the ability to produce daughters with attached-X chromosomes. This ability is characteristic of males carrying an X chromosome derived from 59b-z, a multiply marked X chromosome, and is especially pronounced in males carrying the unstable 59b-z chromosomes Uc and Uc-lr. Recombination experiments with one of the Uc-lr chromosomes showed that the formation of compound chromosomes depends on two widely separated segments. One of these is proximal to the forked locus and is probably proximal to the carnation locus. This segment may contain the actual site of chromosome attachment. The other essential segment lies between the crossveinless and vermilion loci and may contain multiple factors that influence the attachment process.

Animals↗

PubMed1988

Synovial plicae syndrome.

The suprapatellar, medial patellar, and infrapatellar plicae are three embryonic remnants of synovial tissues that are often a cause of intermittent anterior knee pain. A primary blunt trauma or internal pathological derangement will result in the plicae becoming thickened and inelastic with an often inappropriate diagnosis of meniscal tear. The signs, symptoms and examination findings when combined with special testing enables the doctor to correctly establish a diagnosis and proceed with treatment. The chiropractic doctor may play a prime role in the conservative method of treatment and prevent further dysfunction leading to surgical excision as the treatment of choice. This paper will review and summarize the current knowledge of plicae anatomy, pathophysiology, diagnosis and therapeutics in an attempt to provide chiropractors with an increasing awareness of the synovial plicae syndrome.

Diagnosis, Differential↗

PubMed1985

A coding system for the office management of patients with keratoconus.

An objective and quantitative technique of coding keratoconus according to appropriate treatment plans is suggested. This system is a systematic approach to managing keratoconus with regard to predicting relative success with contact lenses, a well-accepted treatment modality for keratoconus. A discussion of results with various treatment plans and time study while employing this coding system is offered. A retrospective analysis of those pathological and anatomical (objective) findings in keratoconus important in fitting contact lenses is reviewed and incorporated in this new system. A discussion of various fitting options and materials available which may be effective in lessening the progression to advanced levels of this classification system is included.

Adolescent↗

PubMed1979